amkr-20260331

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)


	For the Three Months Ended March 31,
	2026		2025
	(In thousands, except per share data)
Net sales	$	1,684,701	$	1,321,575
Cost of sales	1,445,669		1,163,992
Gross profit	239,032		157,583
Selling, general and administrative	96,987		80,408
Research and development	41,758		45,652

Total operating expenses	138,745		126,060
Operating income	100,287		31,523
Interest expense	17,710		16,809

Other (income) expense, net	(13,731)		(11,075)
Total other expense, net	3,979		5,734
Income before taxes	96,308		25,789
Income tax expense	12,342		3,936
Net income	83,966		21,853
Net income attributable to non-controlling interests	(615)		(725)
Net income attributable to Amkor	$	83,351	$	21,128

Net income attributable to Amkor per common share:
Basic	$	0.34	$	0.09
Diluted	$	0.33	$	0.09

Shares used in computing per common share amounts:
Basic	247,550		246,854
Diluted	249,570		247,845

The accompanying notes are an integral part of these statements.

-3-

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Net income	$	83,966	$	21,853
Other comprehensive income (loss), net of tax:
Adjustments to net unrealized gains (losses) on available-for-sale debt investments	(2,541)		1,127
Adjustments to unrealized components of defined benefit pension plans	(123)		(2,480)
Foreign currency translation	1,108		3,874

Total other comprehensive income (loss)	(1,556)		2,521
Comprehensive income	82,410		24,374
Comprehensive income attributable to non-controlling interests	(615)		(725)
Comprehensive income attributable to Amkor	$	81,795	$	23,649

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONSOLIDATED BALANCE SHEETS

(Unaudited)


	March 31, 2026		December 31, 2025
	(In thousands, except per share data)
ASSETS
Current assets:
Cash and cash equivalents	$	1,121,183	$	1,378,347
Restricted cash	175		—
Short-term investments (amortized cost of $729,328 and $612,344 in 2026 and 2025, respectively)	727,317		613,038
Accounts receivable, net of allowances	1,287,879		1,354,825
Inventories	494,620		437,797
Other current assets	120,435		100,754
Total current assets	3,751,609		3,884,761
Property, plant and equipment, net	4,150,783		3,870,808
Operating lease right of use assets	90,278		93,449
Goodwill	17,775		18,003
Restricted cash	67,804		67,776
Other assets	220,385		201,512
Total assets	$	8,298,634	$	8,136,309
LIABILITIES AND EQUITY
Current liabilities:
Short-term borrowings and current portion of long-term debt	$	157,038	$	162,430
Trade accounts payable	832,101		912,766
Capital expenditures payable	488,731		243,543
Short-term operating lease liability	23,570		23,140
Accrued expenses	365,339		370,093
Total current liabilities	1,866,779		1,711,972
Long-term debt	1,257,156		1,282,816
Pension and severance obligations	67,947		69,218
Long-term operating lease liabilities	44,194		48,549
Other non-current liabilities	493,416		517,467
Total liabilities	3,729,492		3,630,022
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	—		—
Common stock, $0.001 par value, 500,000 shares authorized; 294,394 and 293,756 shares issued; and 247,828 and 247,303 shares outstanding in 2026 and 2025, respectively	294		294
Additional paid-in capital	2,060,642		2,054,051
Retained earnings	2,689,683		2,627,038
Accumulated other comprehensive income (loss)	15,277		16,833
Treasury stock, at cost, 46,566 and 46,453 shares in 2026 and 2025, respectively	(232,385)		(227,110)
Total Amkor stockholders’ equity	4,533,511		4,471,106
Non-controlling interests in subsidiaries	35,631		35,181
Total equity	4,569,142		4,506,287
Total liabilities and equity	$	8,298,634	$	8,136,309

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited)


				Additional Paid- In Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)					Total Amkor Stockholders’ Equity		Noncontrolling Interest in Subsidiaries		Total Equity
	Common Stock									Treasury Stock
	Shares	Par Value								Shares	Cost
	(In thousands)
Balance at December 31, 2025	293,756	$	294	$	2,054,051	$	2,627,038	$	16,833	(46,453)	$	(227,110)	$	4,471,106	$	35,181	$	4,506,287
Net income	—	—		—		83,351		—		—	—		83,351		615		83,966
Other comprehensive income (loss)	—	—		—		—		(1,556)		—	—		(1,556)		—		(1,556)


Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—		—		(113)	(5,275)		(5,275)		—		(5,275)
Issuance of stock through share-based compensation plans	638	—		500		—				—	—		500		—		500
Share-based compensation	—	—		6,091		—		—		—	—		6,091		—		6,091
Cash dividends declared ($0.08352 per common share)	—	—		—		(20,706)		—		—	—		(20,706)		—		(20,706)
Subsidiary dividends to non-controlling interests	—	—		—		—		—		—	—		—		(165)		(165)
Balance at March 31, 2026	294,394	$	294	$	2,060,642	$	2,689,683	$	15,277	(46,566)	$	(232,385)	$	4,533,511	$	35,631	$	4,569,142


				Additional Paid- In Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)					Total Amkor Stockholders’ Equity		Noncontrolling Interest in Subsidiaries		Total Equity
	Common Stock									Treasury Stock
	Shares	Par Value								Shares	Cost
	(In thousands)
Balance at December 31, 2024	293,052	$	293	$	2,031,643	$	2,335,132	$	7,510	(46,368)	$	(225,033)	$	4,149,545	$	33,620	$	4,183,165
Net income	—	—		—		21,128		—		—	—		21,128		725		21,853
Other comprehensive income (loss)	—	—		—		—		2,521		—	—		2,521		—		2,521


Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—		—		(59)	(1,319)		(1,319)		—		(1,319)
Issuance of stock through share-based compensation plans	430	—		769		—		—		—	—		769		—		769
Share-based compensation	—	—		4,196		—		—		—	—		4,196		—		4,196
Cash Dividends declared ($0.08269 per common share)	—	—		—		(20,430)		—		—	—		(20,430)		—		(20,430)
Subsidiary dividends to non-controlling interests	—	—		—		—		—		—	—		—		(165)		(165)
Balance at March 31, 2025	293,482	$	293	$	2,036,608	$	2,335,830	$	10,031	(46,427)	$	(226,352)	$	4,156,410	$	34,180	$	4,190,590

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Cash flows from operating activities:
Net income	$	83,966	$	21,853
Depreciation and amortization	170,903		153,821


Other operating activities and non-cash items	(5,871)		5,967
Changes in assets and liabilities	(103,911)		(157,492)
Net cash provided by operating activities	145,087		24,149
Cash flows from investing activities:
Payments for property, plant and equipment	(224,605)		(79,897)
Proceeds from sale of property, plant and equipment	7,179		4,209

Proceeds from foreign exchange forward contracts	14,899		16,674
Payments for foreign exchange forward contracts	(16,684)		(15,992)
Payments for short-term investments	(258,469)		(169,720)
Proceeds from sale of short-term investments	14,607		32,345
Proceeds from maturities of short-term investments	127,318		147,825
Other investing activities	1,036		1,502
Net cash used in investing activities	(334,719)		(63,054)
Cash flows from financing activities:






Payments of long-term debt	(27,737)		(25,493)




Payments of finance lease obligations	(14,543)		(15,659)



Payments of dividends	(20,694)		—
Other financing activities	(4,073)		(1,099)
Net cash used in financing activities	(67,047)		(42,251)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(282)		5,172
Net decrease in cash, cash equivalents and restricted cash	(256,961)		(75,984)
Cash, cash equivalents and restricted cash, beginning of period	1,446,123		1,134,312
Cash, cash equivalents and restricted cash, end of period	$	1,189,162	$	1,058,328
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	$	381,637	$	202,242

Dividends declared and unpaid	—		20,423
Right of use assets acquired through operating lease liabilities	239		395
Right of use assets acquired through finance lease liabilities	4,007		10,645
Property, plant and equipment acquired through exchange and derecognition of right of use assets	5,250		11,507
Grants and incentive receivables recognized for qualified capital expenditures	37,648		2,939

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Interim Financial Statements

Basis of Presentation. The Consolidated Financial Statements and related disclosures as of March 31, 2026, and for the three months ended March 31, 2026 and 2025, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited pursuant to the rules and regulations of the SEC. The December 31, 2025 Consolidated Balance Sheet data contained in this Form 10-Q was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to SEC rules and regulations. In our opinion, the Consolidated Financial Statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods and should be read in conjunction with the financial statements included in the 2025 Form 10-K. The results of operations for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for the full year ending December 31, 2026. Unless the context otherwise requires, all references to “Amkor,” “we,” “us” or “our” are to Amkor Technology, Inc. and its wholly and majority-owned subsidiaries. Certain prior year amounts have been recast to conform to current year presentation.

Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments as a result of, for example, any worsening of the global business and economic environment.

Restricted Cash. Restricted cash mainly consists of collateral to fulfill construction requirements and funds to be used exclusively for labor costs.

Leases. Total long-term finance lease liabilities as of March 31, 2026 and December 31, 2025 were $94.6 million and $105.0 million, respectively.

Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation.

Unbilled Receivables. Total unbilled receivables as of March 31, 2026 and December 31, 2025 were $276.3 million and $294.1 million, respectively.

Contract Liabilities. Contract liabilities were $392.4 million and $390.8 million as of March 31, 2026 and December 31, 2025, respectively. As of March 31, 2026 and December 31, 2025, the short-term portions of the liabilities were $81.8 million and $69.6 million, respectively. Of the remaining contract liability balance as of March 31, 2026, $283.8 million is expected to be recognized in revenue over the next 1-5 years, and $26.8 million over the next 5-10 years. Revenue recognized during the three months ended March 31, 2026 and 2025 that was included in the contract liabilities balance at the beginning of the period was $16.8 million and $15.2 million, respectively. As of March 31, 2026, $100.0 million of standby letters of credit were issued and outstanding related to customer advance payments received.

Grant Accounting. From time to time, we may receive grants from governmental agencies. We recognize grants in our financial statements when there is reasonable assurance that we will comply with conditions attached to the grants and the grants will be received. Investment tax credits and grants receivable recorded reduce the carrying amounts of the qualifying property, plant and equipment in our Consolidated Balance Sheets. The following table presents investment tax credits and grants receivable as of March 31, 2026 and December 31, 2025:

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)


	March 31, 2026		December 31, 2025
	(In thousands)
Investment tax credits recorded in:
Other current assets	$	33,604	$	33,604
Other assets	25,707		—
Grants receivable recorded in:
Other current assets	243		—
Other assets	25,073		13,321

Recently Issued Standards. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which was subsequently amended and clarified. ASU 2024-03 requires disaggregation of key expense categories such as inventory purchases, employee compensation, depreciation and intangible asset amortization in the financial statements. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. Adoption of this ASU should be applied either prospectively after the effective date or retrospectively to any or all periods presented in the financial statements. We are currently evaluating the impact of this new standard on our financial statements, which is expected to result in enhanced disclosures.

In September 2025, the FASB issued ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40) (“ASU 2025-06”). ASU 2025-06 removes all references to project stages throughout ASC 350-40 and clarifies the applicable threshold to begin capitalizing costs. ASU 2025-06 is effective for annual reporting periods beginning after December 15, 2027, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using a prospective transition approach, a modified transition approach based on project status or a retrospective transition approach. We are currently evaluating the impact of this new standard on our financial statements and disclosures.

In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832) (“ASU 2025-10”). ASU 2025-10 provides guidance on the accounting for government grants received by a business entity, including grants related to assets and grants related to income. ASU 2025-10 is effective for annual reporting periods beginning after December 15, 2028, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using the following transition methods: (i) a modified prospective approach for government grants that are entered into on or after, or not complete as of, the effective date; (ii) a modified retrospective approach for government grants that are entered into on or after, or not complete as of, the beginning of earliest period presented; or (iii) a retrospective approach for all government grants. We are currently evaluating the impact of this new standard on our financial statements and disclosures.

-9-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

2. Business Segments, Product Groups and End Markets

The following table presents revenue, profit or loss and significant segment expenses for our single operating segment:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Net sales	$	1,684,701	$	1,321,575
Less:
Materials cost of sales	901,773		692,748
Labor cost of sales	180,549		159,164
Depreciation cost of sales	156,132		139,869
Other cost of sales	207,215		172,211
Selling, general and administrative	96,987		80,408
Research and development	41,758		45,652
Interest expense	17,710		16,809
Income tax expense	12,342		3,936
Other segment items (1)	(13,731)		(11,075)
Segment net income	$	83,966	$	21,853

(1) Other segment items include interest income, foreign currency (gain) loss, net and other (income) expense.

The following tables represent other balances included in net income or that are regularly provided to the Chief Operating Decision Maker (CODM):


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	16,220	$	14,453
Depreciation and amortization expense	170,903		153,821
Capital expenditures	224,605		79,897


	March 31, 2026		December 31, 2025
	(In thousands)
Total assets	$	8,298,634	$	8,136,309

The following table presents our net sales by product group:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Advanced products (1)	$	1,372,001	$	1,063,617
Mainstream products (2)	312,700		257,958
Total net sales	$	1,684,701	$	1,321,575

(1) Advanced products include flip chip, memory and wafer-level processing and related test services.

(2) Mainstream products include all other wirebond packaging and related test services.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

Net sales by end market consist of the following:


	For the Three Months Ended March 31,
	2026		2025
Communications (smartphones, tablets)	44	%	40	%
Computing (data center, infrastructure, PC/laptop, storage)	21	%	22	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	21	%	21	%
Consumer (AR & gaming, connected home, home electronics, wearables)	14	%	17	%
Total net sales	100	%	100	%

3. Other Income and Expense

Other income and expense consist of the following:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	(16,220)	$	(14,453)
Foreign currency (gain) loss, net	2,486		3,760



Other, net	3		(382)
Total other (income) expense, net	$	(13,731)	$	(11,075)

4. Income Taxes

Income tax expense of $12.3 million for the three months ended March 31, 2026 reflects income taxes, foreign withholding taxes, minimum taxes and certain tax credits.

We maintain a valuation allowance on certain U.S. and foreign deferred tax assets. Such valuation allowances are released as the related tax benefits are realized or when sufficient evidence exists to conclude that it is more likely than not that the deferred tax assets will be realized.

Unrecognized tax benefits represent reserves for potential tax deficiencies or reductions in tax benefits that could result from federal, state or foreign tax audits. Gross unrecognized tax benefits were $36.8 million and $36.1 million as of March 31, 2026 and December 31, 2025, respectively. As of March 31, 2026, $34.4 million of our unrecognized tax benefits would reduce our effective tax rate if recognized. Our unrecognized tax benefits are subject to change for effective settlement of examinations, changes in the recognition threshold of tax positions, the expiration of statutes of limitations and other factors.

We have tax returns that are open to examination in various jurisdictions for tax years 2013-2025. The open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations related to the amount and/or timing of income, deductions and tax credits. There can be no assurance that the outcome of examinations will be favorable. In certain circumstances where we elect to appeal the results of an examination, we may be required to make tax assessment payments to proceed with the administrative appeal process. Current examinations include 2021 and 2023 Philippine income tax returns, 2022-2024 Japan income tax returns and 2020-2021 California income tax returns.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

5. Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amkor common stockholders by the weighted-average number of common shares outstanding during the period. The weighted-average number of common shares outstanding is reduced for treasury stock.

Diluted EPS is computed based on the weighted-average number of common shares outstanding plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include outstanding stock options, performance-vested restricted stock units (“PSUs”) and time-vested restricted stock units (“RSUs”).

The following table summarizes the computation of basic and diluted EPS:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	83,351	$	21,128




Weighted-average number of common shares outstanding - basic	247,550		246,854
Effect of dilutive securities:
Share-based awards	2,020		991
Weighted-average number of common shares outstanding - diluted	249,570		247,845
Net income attributable to Amkor per common share:
Basic	$	0.34	$	0.09
Diluted	0.33		0.09

The following table summarizes the potential shares of common stock that were excluded from diluted EPS because the effect of including these potential shares was anti-dilutive:


	For the Three Months Ended March 31,
	2026	2025
	(In thousands)
Share-based awards	22	38

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

6. Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss), net of tax, consist of the following:


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2025	$	662	$	20,330	$	(4,159)	$	16,833
Other comprehensive income (loss) before reclassifications	(2,540)		74		1,108		(1,358)
Amounts reclassified from accumulated other comprehensive income (loss)	(1)		(197)		—		(198)
Other comprehensive income (loss)	(2,541)		(123)		1,108		(1,556)
Accumulated other comprehensive income (loss) at March 31, 2026	$	(1,879)	$	20,207	$	(3,051)	$	15,277


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2024	$	(510)	$	16,570	$	(8,550)	$	7,510
Other comprehensive income (loss) before reclassifications	1,207		(2,386)		3,874		2,695
Amounts reclassified from accumulated other comprehensive income (loss)	(80)		(94)		—		(174)
Other comprehensive income (loss)	1,127		(2,480)		3,874		2,521
Accumulated other comprehensive income (loss) at March 31, 2025	$	617	$	14,090	$	(4,676)	$	10,031

(1) Amounts reclassified out of accumulated other comprehensive income (loss) are included as other (income) expense, net (Note 3).

(2) Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 12) or other (income) expense, net (Note 3).

(3) Foreign currency translation includes the gain (loss) from net investment hedges (Note 13).

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

7. Investments

All of our available-for-sale debt investments as of March 31, 2026 are available to fund current operations and are recorded at fair value (Note 14).

The following table summarizes our cash equivalents and available-for-sale debt investments:


	March 31, 2026
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	1,452	$	—	$	—	$	1,452	$	1,452	$	—
Commercial paper	50,654		—		—		50,654		—		50,654


Money market funds	188,407		—		—		188,407		188,407		—



U.S. government bonds	24,774		1		—		24,775		24,775		—
Variable rate demand notes	1,016		—		—		1,016		—		1,016
Total cash equivalents (2)	266,303		1		—		266,304		214,634		51,670

Short-term investments
Asset-backed securities	89,484		64		(130)		89,418		—		89,418
Certificate of deposits	19,431		—		—		19,431		19,431		—
Commercial paper	64,145		—		—		64,145		—		64,145
Corporate bonds	382,446		169		(1,646)		380,969		—		380,969
Foreign government bonds	6,559		—		(11)		6,548		—		6,548
Mortgage-backed securities	913		—		(2)		911		—		911
Municipal bonds	1,011		1		—		1,012		—		1,012
U.S. government agency bonds	12,713		1		(37)		12,677		—		12,677
U.S. government bonds	140,750		37		(457)		140,330		140,330		—
Variable rate demand notes	8,011		—		—		8,011		—		8,011
Total short-term investments	725,463		272		(2,283)		723,452		159,761		563,691
Total	$	991,766	$	273	$	(2,283)	$	989,756	$	374,395	$	615,361

-14-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)


	December 31, 2025
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	2,501	$	—	$	—	$	2,501	$	2,501	$	—
Commercial paper	63,421		—		—		63,421		—		63,421

Money market funds	359,721		—		—		359,721		359,721		—



U.S. government bonds	21,988		2		—		21,990		21,990		—
Variable rate demand notes	1,007		—		—		1,007		—		1,007
Total cash equivalents	448,638		2		—		448,640		384,212		64,428

Short-term investments
Asset-backed securities	69,433		118		(53)		69,498		—		69,498
Certificate of deposits	10,318		—		—		10,318		10,318		—
Commercial paper	67,967		—		—		67,967		—		67,967
Corporate bonds	334,361		592		(73)		334,880		—		334,880

Mortgage-backed securities	912		2		—		914		—		914
Municipal bonds	3,042		4		—		3,046		—		3,046
U.S. government agency bonds	8,614		—		(12)		8,602		—		8,602
U.S. government bonds	106,705		130		(15)		106,820		106,820		—
Variable rate demand notes	7,053		—		—		7,053		—		7,053
Total short-term investments	608,405		846		(153)		609,098		117,138		491,960
Total	$	1,057,043	$	848	$	(153)	$	1,057,738	$	501,350	$	556,388

(1)All unrealized losses have been in a continuous loss position for less than 12 months. We do not intend to sell the investments in an unrealized loss position, and we do not believe it is more likely than not that we will be required to sell these investments before recovery of their amortized cost bases.

(2)For the three months ended March 31, 2026 and 2025, we sold cash equivalent investments for proceeds of $2.0 million and $2.0 million, respectively, and realized no gain or loss on such sales.

The following table summarizes the contractual maturities of our cash equivalents and available-for-sale debt investments as of March 31, 2026:


	Amortized Cost		Fair Value
	(In thousands)
Within 1 year	$	607,243	$	607,159
After 1 year through 5 years	286,115		284,257
After 5 years	8,011		8,011

Asset- and mortgage-backed securities	90,397		90,329
Total	$	991,766	$	989,756

Actual maturities can differ from contractual maturities due to various factors including whether the issuers have the right to call or prepay obligations without call or prepayment penalties, and we view our available-for-sale debt investments as available for current operations.

-15-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

As of March 31, 2026 and December 31, 2025, the amortized cost and the fair market value of our held-to-maturity government bonds (Level 1) maturing within a year were $3.9 million for both periods.

8. Factoring of Accounts Receivable

For certain accounts receivable, we use non-recourse factoring arrangements with third-party financial institutions to manage our working capital and cash flows. Under these arrangements, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the three months ended March 31, 2026 and 2025, we sold receivables totaling $20.9 million and $9.4 million, respectively, net of discounts and fees, which were insignificant for the respective periods.

9. Property, Plant and Equipment

Property, plant and equipment consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Land	$	240,573	$	247,450
Buildings and improvements	2,334,662		2,353,344
Machinery and equipment	8,167,711		7,946,040
Finance lease assets	210,868		217,855
Furniture, fixtures and other equipment	19,009		18,820
Software and computer equipment	225,627		229,769
Construction in progress	368,538		250,152
Total property, plant and equipment	11,566,988		11,263,430
Accumulated depreciation and amortization	(7,416,205)		(7,392,622)
Total property, plant and equipment, net	$	4,150,783	$	3,870,808

The following table summarizes our depreciation expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Depreciation expense	$	170,780	$	153,699

-16-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

10. Accrued Expenses

Accrued expenses consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Payroll and benefits	$	107,849	$	147,910

Deferred revenue and customer advances	81,826		69,611
Income taxes payable	58,062		32,845
Short-term finance lease liability	40,925		44,046
Accrued interest	16,112		8,972

Accrued pension and severance plan obligations	6,746		6,996
Other accrued expenses	53,819		59,713
Total accrued expenses	$	365,339	$	370,093

11. Debt

Short-term borrowings and long-term debt consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:

5.875% Senior notes, due October 2033	$	500,000	$	500,000
Other:
2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 (1)	—		—
Term A Loans, applicable bank rate plus 1.75%, 5.45% as of March 31, 2026, due May 2030	496,875		500,000
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (2)	—		—
Term loan, fixed rate at 2.12%, due December 2028	150,000		150,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (3)	—		—


Term loan, fixed rate at 1.23%, due December 2026	12,380		16,719
Term loan, fixed rate at 1.59%, due December 2027	34,621		40,074
Term loan, fixed rate at 1.80%, due December 2028	60,641		67,003
Term loan, fixed rate at 2.05%, due December 2029	80,803		87,295
Term loan, fixed rate at 2.42%, due December 2030	89,182		95,080




	1,424,502		1,456,171
Less: Unamortized discount and deferred debt costs, net	(10,308)		(10,925)
Less: Short-term borrowings and current portion of long-term debt	(157,038)		(162,430)
Long-term debt	$	1,257,156	$	1,282,816

-17-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

(1)In May 2025, we entered into a $1.0 billion senior secured revolving credit facility (the “2025 Revolving Credit Facility”) guaranteed by Amkor Technology Singapore Holding Pte. Ltd. (“ATSH”) and Guardian Assets, Inc. (“Guardian”). The maximum borrowing capacity under the 2025 Revolving Credit Facility is $1.0 billion. The 2025 Revolving Credit Facility includes an uncommitted optional accordion of up to $200.0 million, which may be incurred in the form of revolving commitment increases or term loans. As of March 31, 2026, $1.0 billion was available for future borrowings under the 2025 Revolving Credit Facility.

(2)In May 2024, we entered into a ₩80.0 billion (approximately $59 million) term loan agreement with the option to borrow and re-borrow the funds up to six times per year through May 2027. Principal is payable at maturity, and interest is payable monthly at a fixed rate of 3.95%. As of March 31, 2026, ₩80.0 billion, or approximately $53 million, was available to be drawn.

(3)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of March 31, 2026, $3.2 million was available to be drawn.

Certain of our debt is collateralized by the land, buildings, equipment and capital stock of subsidiaries. As of March 31, 2026, the collateralized debt balance was $924.5 million, of which $625.6 million of assets and subsidiary capital stock were pledged as collateral.

The debt of Amkor Technology, Inc. is structurally subordinated in right of payment to all existing and future debt and other liabilities of our subsidiaries. From time to time, Amkor Technology, Inc., ATSH and Guardian guarantee certain indebtedness. The agreements governing our indebtedness contain affirmative and negative covenants, including, among others, covenants to maintain a minimum interest coverage ratio and a maximum consolidated leverage ratio, which restrict our ability to pay dividends and could restrict our operations. These restrictions do not currently have a material impact on our ability to make dividend payments or stock repurchases.

We were in compliance with all debt covenants at March 31, 2026.

12. Pension Plans

Foreign Defined Benefit Pension Plans

Our subsidiaries in Japan, Korea, Malaysia, the Philippines and Taiwan sponsor defined benefit pension plans. Charges to expense are based upon actuarial analyses. The components of net periodic pension cost for these defined benefit pension plans are as follows:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Service cost	$	3,038	$	3,261
Interest cost	1,583		1,434
Expected return on plan assets	(1,391)		(1,279)

Recognized actuarial gain	(222)		(119)
Net periodic pension cost	3,008		3,297
Curtailment gain	—		(434)

Total pension expense	$	3,008	$	2,863

The components of net periodic pension cost other than the service cost component are included in other (income) expense, net in our Consolidated Statements of Income.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

Defined Contribution Pension Plans

We sponsor defined contribution pension plans in Korea, Malaysia, Taiwan and the U.S. The following table summarizes our defined contribution expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Defined contribution expense	$	10,688	$	9,304

13. Derivatives

We use foreign currency forward contracts to mitigate foreign currency risk of certain monetary assets and liabilities denominated in foreign currencies. We do not enter into such contracts for trading or speculative purposes. These derivative instruments are not designated as hedging instruments.

We hedge certain net investment positions in foreign subsidiaries. To accomplish this, we enter into foreign currency forward contracts, generally settled monthly, that are designated as hedges of net investments.

As of March 31, 2026 and December 31, 2025, our foreign exchange forward contracts consisted of the following:


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts not designated as hedging instruments
Euro dollar	$	25,174	$	165	Other current assets	$	17,880	$	(6)	Accrued expenses
Japanese yen	223,467		1,140		Other current assets	253,313		(848)		Accrued expenses
Korean won	70,103		646		Other current assets	82,752		(601)		Accrued expenses
Philippine peso	10,685		(4)		Accrued expenses	13,114		(76)		Accrued expenses
Singapore dollar	27,696		(30)		Accrued expenses	11,566		(27)		Accrued expenses
Taiwan dollar	40,666		(165)		Accrued expenses	36,598		(59)		Accrued expenses
Total forward contracts not designated as hedging instruments	$	397,791	$	1,752		$	415,223	$	(1,617)


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts designated as net investment hedging instruments
Japanese yen	$	121,243	$	(646)	Accrued expenses	$	123,846	$	425	Other current assets
Total forward contracts designated as net investment hedging instruments	$	121,243	$	(646)		$	123,846	$	425

-19-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

For the three months ended March 31, 2026 and 2025, we incurred a net loss of $3.6 million and $2.9 million, respectively, due to the impact of derivatives not designated as hedging instruments, which includes the forward costs, and the revaluation of the related hedged items.

The following table presents the gain or loss recognized on our derivatives designated as net investment hedging instruments for the three months ended March 31, 2026 and 2025:


		For the Three Months Ended March 31,
	Location on Consolidated Financial Statements	2026		2025
		(In thousands)
Difference between forward rate and spot rate of the forward contracts	Other (income) expense, net	$	(980)	$	(1,318)
Changes in fair value of forward contracts	Other comprehensive income (loss)	$	1,173	$	(4,709)

14. Fair Value Measurements

The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers as follows: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and Level 3, defined as unobservable inputs that are not corroborated by market data. For our Level 2 short-term investments, we consider factors such as actual trade data, benchmark yields, broker/dealer quotes, and other similar data obtained from quoted market prices and independent pricing vendors to determine the fair value of these assets and liabilities.

The fair values of cash, accounts receivable, trade accounts payable, capital expenditures payable and certain other current assets and accrued expenses approximate carrying values because of their short-term nature. The carrying value of certain other non-current assets and liabilities approximates fair value. Our assets and liabilities recorded at fair value on a recurring basis include restricted cash money market funds and short-term investments, including investments classified as cash equivalents. Cash equivalent money market funds and restricted cash money market funds are invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts, which are due on demand or carry a maturity date of less than three months when purchased. No restrictions have been imposed on us regarding withdrawal of balances with respect to our cash equivalents as a result of liquidity or other credit market issues affecting the money market funds we invest in or the counterparty financial institutions holding our deposits.

Our derivative financial instruments are valued using quoted market prices for similar assets. Counterparties to these derivative contracts are highly rated financial institutions.

We also measure certain assets and liabilities, including property, plant and equipment and goodwill, at fair value on a nonrecurring basis.

We measure the fair value of our debt for disclosure purposes. The following table presents the fair value of our debt:


	March 31, 2026				December 31, 2025
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	499,070	$	493,623	$	511,405	$	493,457
Revolving credit facilities and term loans (Level 2)	912,400		920,571		948,501		951,789
Total debt	$	1,411,470	$	1,414,194	$	1,459,906	$	1,445,246

-20-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

The estimated fair value of our senior notes is based primarily on quoted market prices reported on or near the respective balance sheet dates. The estimated fair value of our revolving credit facilities and term loans is calculated using a discounted cash flow analysis, which utilizes market-based assumptions, including forward interest rates adjusted for credit risk.

15. Commitments and Contingencies

We generally warrant that our services will be performed in a professional and workmanlike manner and in compliance with our customers’ specifications. We accrue costs for known warranty issues. Historically, our warranty costs have been immaterial.

Legal Proceedings

We are involved in claims and legal proceedings and may become involved in other legal matters arising in the ordinary course of our business. We evaluate these claims and legal matters on a case-by-case basis to make a determination as to the impact, if any, on our business, liquidity, results of operations, financial condition or cash flows. Although the outcome of these matters is uncertain, we believe that the ultimate outcome of these claims and proceedings, individually and in the aggregate, will not have a material adverse impact on our business, liquidity, results of operations, financial condition or cash flows. Our evaluation of the potential impact of these claims and legal proceedings could change in the future.

In accordance with the accounting guidance for loss contingencies, including legal proceedings, lawsuits, pending claims and other legal matters, we accrue for a loss contingency when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose loss contingencies if we believe they are material and there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred.

Commitments

We enter into various contracts related to the construction and development of our manufacturing facilities. As of March 31, 2026, the remaining commitments under these contracts were approximately $468 million.

-21-

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Overview

Amkor is the world’s largest U.S. headquartered outsourced semiconductor assembly and test provider (“OSAT”). We are an industry leader in developing and commercializing advanced packaging and test technologies, which we believe provide substantial value to our customers. Our primary financial objective is profitable sales growth. To achieve this goal, we are focused on leveraging our technology leadership and innovation, providing our customers with a geographically diverse manufacturing footprint, partnering with lead customers in the key markets of high-performance computing (“HPC”) and artificial intelligence (“AI”), automotive, Internet-of-Things (“IoT”) and mobile communications, selectively growing our scale and scope through strategic investments and optimizing utilization of existing assets.

Amkor is a global leader in advanced semiconductor packaging and test technologies. Our technology leadership encompasses areas such as high density fan-out (“HDFO”), 2.5D integration, advanced flip chip, fine pitch bumping, wafer-level processing and advanced system-in-package (“SiP”) solutions which support the industry’s drive toward smaller form factors, higher integration, improved performance and lower power consumption. We provide turnkey solutions that include package design, wafer bump, wafer probe, wafer back-grind, packaging, burn-in, system level and final test and drop shipment services. Our extensive line of packaging and test services covers analog, digital, logic, mixed signal, memory, sensors and radio frequency devices. This breadth of services allows customers to limit the number of suppliers and focus their resources on semiconductor design and wafer fabrication. Our commitment to technology leadership is reinforced by ongoing investment in research and development, and we intend to continue to leverage our investments in advanced technology to meet the demand for these services in key markets.

Amkor’s broad and strategically located manufacturing footprint is a key differentiator, enabling us to deliver flexible, resilient and cost-effective solutions to customers worldwide. With facilities located in key manufacturing regions in Asia and Europe, we provide customers with multiple options to mitigate risk, diversify supply chains and support regionalization initiatives. As a U.S. headquartered OSAT, we are expanding our manufacturing footprint with the construction of a new facility in Arizona. Construction began in the second half of 2025, and we believe that this investment will strengthen our ability to serve customers seeking to regionalize their supply chains and will enhance our participation in U.S. semiconductor initiatives. In addition, we continue to scale production in our Vietnam facility, which opened in 2024, further increasing our capacity and operational flexibility in Asia. Our scale and geographic diversity allow us to qualify production at multiple sites, optimize asset utilization and absorb large orders with quick turnaround times.

Amkor has built long-standing relationships with most of the world’s leading semiconductor companies over the last five decades. Our operational excellence, high quality, reliability and predictability have been key to attracting and retaining customers. Our collaborative approach enables us to work closely with customers and suppliers to co-develop proprietary process technologies, accelerate time-to-market, improve quality and lower costs. We work closely with lead customers to deliver advanced packaging solutions tailored to evolving industry needs.

High performance computing supporting artificial intelligence and increasing demand for improved networking speed and storage within data centers, cloud computing, PCs and laptops are driving increasing demand for semiconductors and advanced packaging in the computing end market. Increasing semiconductor content in automobiles is driving demand for advanced packaging to enable safety features such as advanced driver assistance systems (“ADAS”), in-car computing, radar and digital cockpit features such as infotainment displays and telematics. Increasing battery voltage, higher voltage power converters, onboard chargers, automotive inverter components and microcontrollers also require innovative power packaging solutions. Hearables, watches and augmented and virtual reality devices integrate multiple functions, such as processors, sensors and connectivity devices, into small form factors, which requires innovation in advanced packaging. We have a strong position across multiple device functionalities within premium and high-tier smartphones. We are collaborating with industry leaders as smartphones transition to include artificial intelligence and drive semiconductor growth through the adoption of new wireless standards, integration of a broad range of applications, enhanced features and higher performance requirements to support increased data processing. The trend to greater functionality drives miniaturization and innovation enabled by advanced packaging.

As a supplier in the semiconductor industry, our business is cyclical and impacted by broad economic factors. Historical trends indicate there has been a strong correlation between worldwide gross domestic product levels, consumer spending

-22-

and semiconductor industry cycles. The semiconductor industry has experienced significant and sometimes prolonged cyclical upturns and downturns in the past. We cannot predict the timing, strength or duration of any correction, economic slowdown, recession or subsequent economic recovery.

We operate in a capital-intensive industry. Servicing our current and future customers requires that we incur significant operating expenses and continue to make significant capital expenditures, which are generally made in advance of expected revenues and without firm customer commitments. We fund our operations, including capital expenditures and other investments and servicing principal and interest obligations with respect to our debt, from cash flows from our operations, existing cash and cash equivalents, borrowings under available debt facilities and/or proceeds from any additional debt or equity financing. Our liquidity is affected by, among other factors, volatility in the global economy and credit markets, the performance of our business, our capital expenditures and other investment levels, other uses of our cash, including any payments of dividends and purchases of stock under any stock repurchase program, any acquisitions or investments in joint ventures and any decisions we might make to either repay debt and other long-term obligations out of our operating cash flows or refinance debt at or prior to maturity with the proceeds of debt or equity financings. As of March 31, 2026, we had cash and cash equivalents and short-term investments of $1,121.2 million and $727.3 million, respectively.

Our results of operations and cash flows have historically fluctuated significantly from quarter to quarter due to many factors, including the seasonality of our business, the cyclical nature of the semiconductor industry and other factors discussed in the “Risk Factors” section in Part II, Item 1A of this Form 10-Q. We continue to monitor the recent changes in global trade policy, including tariffs and related trade actions announced by the U.S. and other countries. The degree to which such tariffs and other related actions impact our business, financial condition and results of operations will depend on future developments, which are uncertain. We will continue to make prudent investments, and we will closely manage capacity expansion and control costs in response to any changes in market conditions.

Financial Summary

Our net sales increased $363.1 million, or 27.5%, to $1,684.7 million for the three months ended March 31, 2026 compared to $1,321.6 million for the three months ended March 31, 2025, primarily due to growth across all end markets.

Gross margin for the three months ended March 31, 2026 increased to 14.2% compared to 11.9% for the three months ended March 31, 2025. The increase in gross margin was primarily due to higher factory utilization driven by the increase in net sales, partially offset by an increase in the proportion of products sold with higher material content and increased overhead and employee compensation costs.

Operating income margin for the three months ended March 31, 2026 increased to 6.0% compared to 2.4% for the three months ended March 31, 2025, primarily due to the increase in our gross margin discussed above.

Our capital expenditures totaled $224.6 million for the three months ended March 31, 2026 compared to $79.9 million for the three months ended March 31, 2025. Our spending was primarily focused on investments in advanced packaging and test equipment and the Arizona Facility.

Net cash provided by operating activities was $145.1 million for the three months ended March 31, 2026 compared to $24.1 million for the three months ended March 31, 2025. This increase was primarily due to higher operating profits and changes in working capital.

-23-

Results of Operations

The following table sets forth certain operating data as a percentage of net sales for the periods indicated:


	For the Three Months Ended March 31,
	2026		2025
Net sales	100.0	%	100.0	%
Cost of sales:
Materials	53.5	%	52.4	%
Labor	10.7	%	12.0	%
Depreciation	9.3	%	10.6	%
Other manufacturing costs	12.3	%	13.1	%
Gross margin	14.2	%	11.9	%
Selling, general and administrative	5.8	%	6.1	%
Research and development	2.5	%	3.5	%
Operating income	6.0	%	2.4	%
Net income attributable to Amkor	4.9	%	1.6	%

Net Sales


	For the Three Months Ended March 31,
	2026		2025		Change
	(In thousands, except percentages)
Net sales	$	1,684,701	$	1,321,575	$	363,126	27.5	%

The increase in net sales for the three months ended March 31, 2026 compared to the three months ended March 31, 2025 was primarily due to growth across all end markets. The communications and automotive and industrial end markets grew 42% and 28%, respectively, for the three months ended March 31, 2026 compared to 2025, primarily driven by increased supported content in premium tier smartphones and growth in ADAS and industrial applications, respectively. The computing and consumer end markets grew 19% and 4%, respectively, for the three months ended March 31, 2026 compared to 2025, primarily driven by strength in datacenter and traditional consumer products, respectively.

Gross Profit and Gross Margin


	For the Three Months Ended March 31,
	2026			2025			Change
	(In thousands, except percentages)
Gross profit	$	239,032		$	157,583		$	81,449
Gross margin	14.2		%	11.9		%	2.3		%

Our cost of sales consists principally of materials, labor, depreciation and manufacturing overhead. Since a substantial portion of the costs at our factories is fixed, there tends to be a strong relationship between our revenue levels and gross margin. Accordingly, relatively modest increases or decreases in revenue can have a significant effect on margin and on labor and other manufacturing costs as a percentage of revenue, depending on product mix, utilization, foreign currency exchange rate movements and seasonality. We have expanded our business in advanced packaging, which tends to have higher material costs than our other products. As we continue to increase production of these higher material cost products, there could be an impact on our profitability, depending on overall utilization.

Gross profit and gross margin increased for the three months ended March 31, 2026 compared to the three months ended March 31, 2025, primarily due to higher factory utilization driven by the increase in net sales, partially offset by an

-24-

increase in the proportion of products sold with higher material content and increased overhead and employee compensation costs.

Selling, General and Administrative


	For the Three Months Ended March 31,
	2026		2025		Change
	(In thousands, except percentages)
Selling, general and administrative	$	96,987	$	80,408	$	16,579	20.6	%

Selling, general and administrative expenses increased for the three months ended March 31, 2026 compared to the three months ended March 31, 2025, primarily due to increased employee compensation and software-related costs.

Research and Development


	For the Three Months Ended March 31,
	2026		2025		Change
	(In thousands, except percentages)
Research and development	$	41,758	$	45,652	$	(3,894)	(8.5)	%

Research and development activities are focused on developing new packaging and test services and improving the efficiency and capabilities of our existing production processes. The costs related to our technology and product development projects are included in research and development expense until the project moves into production. Once production begins, the costs relating to production become part of the cost of sales, including ongoing depreciation for the equipment previously held for research and development activities.

Research and development expenses decreased for the three months ended March 31, 2026 compared to the three months ended March 31, 2025, primarily due to projects moving into production, partially offset by development projects in new advanced packaging technologies.

Other Income and Expense


	For the Three Months Ended March 31,
	2026		2025		Change
	(In thousands, except percentages)
Interest expense	$	17,710	$	16,809	$	901	5.4	%
Interest income	(16,220)		(14,453)		(1,767)		12.2	%
Foreign currency (gain) loss, net	2,486		3,760		(1,274)		(33.9)	%

Other, net	3		(382)		385		>(100)%
Total other expense, net	$	3,979	$	5,734	$	(1,755)	(30.6)	%

The components of total other expense, net have remained consistent between the three months ended March 31, 2026 and the three months ended March 31, 2025.

Income Tax Expense


	For the Three Months Ended March 31,
	2026		2025		Change
	(In thousands)
Income tax expense	$	12,342	$	3,936	$	8,406

Income tax expense, which includes foreign withholding taxes, minimum taxes and certain tax credits, reflects the applicable tax rates in effect in the various countries where our income is earned and is subject to volatility depending on the relative mix of earnings in each location. Income tax expense increased for the three months ended March 31, 2026 compared to the three months ended March 31, 2025, primarily due to an increase in income before income taxes.

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During the three months ended March 31, 2026 and 2025, our subsidiaries in Singapore and Vietnam operated under various conditional reduced tax rates. The conditional reduced tax rates granted to certain operations in Korea expired during 2025. As these conditional reduced tax rates expire, income earned in these jurisdictions will be subject to higher statutory income tax rates, which may cause our effective tax rate to increase.

See Note 4 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q for additional information about our income tax expense.

Liquidity

We assess our liquidity based on our current expectations regarding sales and operating expenses, capital spending, dividend payments, stock and debt repurchases, debt service requirements, lease obligations and other funding needs. Based on this assessment, we believe that our cash flow from operating activities, together with existing cash and cash equivalents, short-term investments and availability under our credit facilities, will be sufficient to fund our working capital, capital expenditures, dividend payments, debt service, debt repurchases and other financial requirements for at least the next 12 months.

Our liquidity is affected by, among other factors, volatility in the global economy and credit markets, the performance of our business, our capital expenditure levels, other uses of our cash including any dividends and purchases of stock or debt under any repurchase program, any acquisitions, joint ventures or other investments and our ability to either repay debt out of operating cash flow or refinance it at or prior to maturity with the proceeds from debt or equity offerings. There can be no assurance that we will generate the necessary net income or operating cash flows, or be able to borrow sufficient funds, to meet the funding needs of our business beyond the next 12 months due to a variety of factors, including the cyclical nature of the semiconductor industry and other factors discussed in Part II, Item 1A of this Form 10-Q.

Our primary source of cash and the source of funds for our operations are cash flows from operations, current cash and cash equivalents, short-term investments, borrowings under available credit facilities and proceeds from any additional debt or equity financings. Please refer to Note 7 and Note 11 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q for additional information on our investments and borrowings, respectively.

As of March 31, 2026, we had cash and cash equivalents and short-term investments of $1,848.5 million. Included in our cash and short-term investments balances as of March 31, 2026 is $1,400.4 million held offshore by our foreign subsidiaries. We have the ability to access cash held offshore by our foreign subsidiaries primarily through the repayment of intercompany debt obligations. If we were to distribute this offshore cash to the United States as dividends from our foreign subsidiaries, the dividends generally would not be subject to U.S. federal income tax, but the distributions may be subject to foreign withholding and state income taxes.

For certain accounts receivable, we use non-recourse factoring arrangements with third party financial institutions to manage our working capital and cash flows. Under these arrangements, we sell receivables to a financial institution for cash at a discount to the face amount. Available capacity under these arrangements is dependent on the level of our trade accounts receivable eligible to be sold, the financial institutions’ willingness to purchase such receivables and the limits provided by the financial institutions. These factoring arrangements can be reduced or eliminated at any time due to market conditions and changes in the creditworthiness of customers. For the three months ended March 31, 2026 and 2025, we sold receivables totaling $20.9 million and $9.4 million, respectively, net of discounts and fees, which were insignificant for the respective periods.

We operate in a capital-intensive industry. Servicing our current and future customers may require that we incur significant operating expenses and make significant investments in equipment and facilities, which are generally made in advance of the related revenues and without firm customer commitments.

In December 2024, we signed a Direct Funding Agreement with the U.S. Department of Commerce (the “Commerce Department”) for the award of up to $407 million in government incentives pursuant to the CHIPS Act, and no funds have been received to date. The award requires us to achieve construction and production milestones over the next several years. In addition, we are eligible to receive a 35% investment tax credit on qualified investments in U.S. semiconductor manufacturing under the CHIPS Act and the One Big Beautiful Bill Act (“OBBBA”). For additional information, please refer to Note 1 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q.

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The maximum amount available to draw under the 2025 Revolving Credit Facility is $1.0 billion. The 2025 Revolving Credit Facility includes an uncommitted optional accordion of up to $200.0 million, which may be incurred in the form of revolving commitment increases or term loans. As of March 31, 2026, we had availability of $1.0 billion under the 2025 Revolving Credit Facility. As of March 31, 2026, our foreign subsidiaries also had $55.9 million available to be borrowed under term loan credit facilities.

As of March 31, 2026, we had debt of $1,414.2 million, with $157.0 million payable within 12 months. As of March 31, 2026, the interest payment obligations, based on stated coupon rates for fixed rate debt and interest rates applicable at March 31, 2026 for variable rate debt, were $357.2 million during the remaining term of the debt. Interest payment obligations payable within 12 months were $64.8 million. We were in compliance with all debt covenants as of March 31, 2026, and we expect to remain in compliance with these covenants for at least the next 12 months. For additional information regarding our debt arrangements, please refer to Note 11 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q.

Certain of our debt agreements contain affirmative and negative covenants including, among others, covenants to maintain a minimum interest coverage ratio and a maximum consolidated leverage ratio, which restrict our ability to pay dividends and could restrict our operations. These restrictions do not currently have a material impact on our ability to make dividend payments or stock repurchases.

In order to reduce our debt and future cash interest payments, we may from time to time repurchase or redeem our outstanding senior notes for cash or exchange shares of our common stock for our outstanding senior notes. Any such transaction may be made in the open market, through privately negotiated transactions or otherwise and would be subject to the terms of our indentures and other debt agreements, market conditions and other factors.

We lease certain machinery and equipment, office space and manufacturing facilities. As of March 31, 2026, our total remaining operating lease obligations and finance lease obligations were $78.5 million and $154.7 million, respectively, with $26.5 million and $47.7 million payable within 12 months, respectively. The lease obligations represent our future minimum lease payments including interest payments.

We had off-balance sheet purchase obligations for capital expenditures, long-term supply contracts and other contractual commitments. As of March 31, 2026, the purchase obligations were $1,034.1 million, with $947.2 million payable within 12 months.

We enter into customer advance payment agreements from time to time, some of which require standby letters of credit. As of March 31, 2026, we expect to receive approximately $300 million of advance payments over a two-year period, all of which will require standby letters of credit upon receipt. For additional information regarding our customer advance payments, please refer to Note 1 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q.

Capital Returns

In November 2022, we announced our intention to return 40 percent to 50 percent of cumulative free cash flow generated over time, beginning 2022. This return may be in the form of dividends and stock repurchases, subject to a variety of factors, including strategic investments, other capital allocation priorities and Board of Directors’ approval.

During the three months ended March 31, 2026, we paid total quarterly cash dividends of $20.7 million, and we currently anticipate that we will continue to pay quarterly cash dividends in the future. However, the payment, amount and timing of future dividends remain within the discretion of our Board of Directors and will depend upon our results of operations, financial condition, cash requirements, debt restrictions and other factors.

Capital Resources

We make significant capital expenditures in order to service the demand of our customers. During the three months ended March 31, 2026, our capital expenditures totaled $224.6 million, which are primarily focused on investments in advanced packaging and test equipment and the Arizona Facility.

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We expect that our 2026 capital expenditures will be approximately $2.5 billion to $3.0 billion. The increase from 2025 is primarily due to the construction of the Arizona Facility. Ultimately, the amount of our 2026 capital expenditures will depend on several factors including, among others, the timing and implementation of any capital projects under review, including the progress of construction of the Arizona Facility, the performance of our business, economic and market conditions, the cash needs and investment opportunities for the business, the need for additional capacity to service anticipated customer demand, equipment lead times and the availability of cash flows from operations or financing. The primary sources of funds for our capital expenditures are cash flows from operations, current cash and cash equivalents, short-term investments, borrowings under available credit facilities and proceeds from any additional debt or equity financings. Please refer to Note 7 and Note 11 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q for additional information on our investments and borrowings, respectively.

In addition, we are subject to risks associated with our capital expenditures, including those discussed in the “Risk Factors” section in Part II, Item 1A of this Form 10-Q under the caption “We make substantial investments in equipment and facilities to support the demand of our customers, which may materially and adversely affect our business if the demand of our customers does not develop as we expect or is adversely affected.”

Cash Flows

Net cash provided by (used in) operating, investing and financing activities for the three months ended March 31, 2026 and 2025, was as follows:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Operating activities	$	145,087	$	24,149
Investing activities	(334,719)		(63,054)
Financing activities	(67,047)		(42,251)

Operating activities: Our cash flow provided by operating activities for the three months ended March 31, 2026 increased by $120.9 million compared to the three months ended March 31, 2025, primarily due to higher operating profits and changes in working capital.

Investing activities: Our cash flow used in investing activities for the three months ended March 31, 2026 increased by $271.7 million compared to the three months ended March 31, 2025, primarily due to higher payments for property, plant and equipment and net payments for short-term investments in the current year. Payments for property, plant and equipment can fluctuate based on the timing of purchase, receipt and acceptance of equipment.

Financing activities: The changes in financing activities for the three months ended March 31, 2026 compared to the three months ended March 31, 2025 were primarily due to the timing of our quarterly dividend payment for the respective periods.

We provide the following supplemental data to assist our investors and analysts in understanding our liquidity and capital resources. We define “free cash flow” as net cash provided by operating activities less payments for property, plant and equipment, plus proceeds from the sale of, insurance recovery for and grants for property, plant and equipment, if applicable. Free cash flow is not defined by U.S. GAAP. We believe free cash flow to be relevant and useful information to our investors because it provides them with additional information in assessing our liquidity, capital resources and financial operating results. Our management uses free cash flow in evaluating our liquidity, our ability to service debt, our ability to fund capital expenditures and our ability to pay dividends and the amount of dividends to be paid. However, free cash flow has certain limitations, including that it does not represent the residual cash flow available for discretionary expenditures since other, non-discretionary expenditures, such as mandatory debt service, are not deducted from the measure. The amount of mandatory versus discretionary expenditures can vary significantly between periods. This measure should be considered in addition to, and not as a substitute for, or superior to, other measures of liquidity or financial performance prepared in accordance with U.S. GAAP, such as net cash provided by operating activities. Furthermore, our definition of free cash flow may not be comparable to similarly titled measures reported by other companies.

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	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Net cash provided by operating activities	$	145,087	$	24,149
Payments for property, plant and equipment	(224,605)		(79,897)
Proceeds from sale of and grants for property, plant and equipment	8,233		5,767
Free cash flow	$	(71,285)	$	(49,981)

New Accounting Pronouncements

For information regarding recently adopted and recently issued accounting standards, please refer to Note 1 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Market Risk Sensitivity

We are exposed to market risks, primarily related to foreign currency and interest rate fluctuations. In the normal course of business, we employ established policies and procedures to manage the exposure to fluctuations in foreign currency values and changes in interest rates.

Foreign Currency Risk

The U.S. dollar is our reporting and functional currency for our subsidiaries, except for our Japan operations, where the Japanese yen is the functional currency. In order to reduce our exposure to foreign currency gains and losses, we use natural hedging techniques and forward contracts to mitigate foreign currency risk.

We have foreign currency exchange rate risk associated with the remeasurement of monetary assets and liabilities on our Consolidated Balance Sheets that are denominated in currencies other than the functional currency. We performed a sensitivity analysis of our foreign currency exposure as of March 31, 2026 to assess the potential impact of fluctuations in exchange rates for all foreign denominated assets and liabilities. Assuming that all foreign currencies appreciated 10% against the U.S. dollar and taking into account our foreign currency forward contracts, our income before taxes for the three months ended March 31, 2026 would have been approximately $12 million lower, due to the remeasurement of monetary assets and liabilities.

In addition, we have foreign currency exchange rate exposure on our results of operations. For the three months ended March 31, 2026, approximately 90% of our net sales were denominated in U.S. dollars. Our remaining net sales were principally denominated in Japanese yen. For the three months ended March 31, 2026, approximately 60% of our cost of sales and operating expenses were denominated in U.S. dollars and were largely for raw materials and costs associated with property, plant and equipment. The remaining portion of our cost of sales and operating expenses was principally denominated in the Asian currencies where our production facilities are located and largely consisted of labor. To the extent that the U.S. dollar weakens against these Asian-based currencies, similar foreign currency denominated income and expenses in the future will result in higher sales, higher cost of sales and operating expenses, with cost of sales and operating expenses having the greater impact on our financial results. Similarly, our sales, cost of sales and operating expenses will decrease if the U.S. dollar strengthens against these foreign currencies. We performed a sensitivity analysis of our foreign currency exposure as of March 31, 2026 to assess the potential impact of fluctuations in exchange rates for all foreign denominated sales and operating expenses. Assuming that all foreign currencies appreciated 10% against the U.S. dollar, our operating income for the three months ended March 31, 2026 would have been approximately $42 million lower.

There are inherent limitations in the sensitivity analysis presented, primarily the assumption that foreign exchange rate movements across multiple jurisdictions would change instantaneously in an equal fashion. As a result, the analysis is unable to reflect the potential effects of more complex market or other changes that could arise which may positively or negatively affect our results of operations.

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Our Consolidated Financial Statements are impacted by changes in exchange rates at the entity where the local currency is the functional currency. To mitigate this impact, we started to hedge certain net investment positions in foreign subsidiaries by entering into foreign currency forward contracts that are designated as hedges of net investments beginning in April 2024. The effect of foreign exchange rate translation for these entities, inclusive of our foreign currency forward contracts, was a gain of $1.1 million and $3.9 million for the three months ended March 31, 2026 and 2025, respectively, and was recognized as an adjustment to equity through other comprehensive income (loss).

Interest Rate Risk

We have interest rate risk with respect to our available-for-sale debt investments. Our investment portfolio consists of various security types and maturities, with our portfolio primarily having maturities of one year or less. Our primary objective with our investment portfolio is to invest available cash while preserving capital and meeting liquidity needs. These securities are subject to interest rate risk, decreasing in value if market interest rates increase and increasing in value if market interest rates decrease. Due to the relatively short-term nature of our investment portfolio, we believe that an immediate change in interest rates will not have a material impact on the fair value of our available-for-sale debt investments. For information regarding our available-for-sale debt investments, see Note 7 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q.

In addition, we have interest rate risk with respect to our debt. Our fixed and variable rate debt includes foreign borrowings, revolving credit facilities and senior notes. Changes in interest rates have different impacts on the fixed and variable rate portions of our debt portfolio. A change in interest rates on the fixed portion of the debt portfolio impacts the fair value of the debt instrument but has no impact on interest expense or cash flows. A change in interest rates on the variable portion of the debt portfolio impacts the interest incurred and cash flows but will not have a material impact on the fair value of the instrument.

The table below presents the interest rates, maturities and fair value of our fixed and variable rate debt as of March 31, 2026:


	2026 - Remaining			2027			2028			2029			2030			Thereafter			Total			Fair Value
	($ in thousands)
Fixed rate debt	$	123,998		$	132,157		$	112,374		$	40,323		$	18,775		$	500,000		$	927,627		$	914,817
Average interest rate	2.0		%	2.0		%	2.1		%	2.2		%	2.4		%	5.9		%	4.1		%
Variable rate debt	$	9,375		$	12,500		$	25,000		$	25,000		$	425,000		$	—		$	496,875		$	496,653
Average interest rate	5.4		%	5.4		%	5.4		%	5.4		%	5.4		%	—		%	5.4		%
Total debt maturities	$	133,373		$	144,657		$	137,374		$	65,323		$	443,775		$	500,000		$	1,424,502		$	1,411,470

For information regarding the fair value of our long-term debt, see Note 14 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q.

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Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in our periodic reports to the SEC is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure, based on the definition of “disclosure controls and procedures” in Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). In designing and evaluating the disclosure controls and procedures, management recognizes that any disclosure controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management necessarily is required to apply its judgment in evaluating the cost-benefit relationship of possible disclosure controls and procedures.

We carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of March 31, 2026 and concluded those disclosure controls and procedures were effective as of that date.

Changes in Internal Control Over Financial Reporting

We carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of changes to our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act) that occurred during the quarter ended March 31, 2026. There have been no changes in our internal control over financial reporting that occurred during the three months ended March 31, 2026 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

Information about legal proceedings is set forth in Note 15 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q and in Note 17 to the 2025 Form 10-K.

Item 1A. Risk Factors

The factors discussed below are cautionary statements that identify important factors and risks that could cause actual results to differ materially from those anticipated by the forward-looking statements contained in this Form 10-Q. For more information, see the Forward-Looking Statements within this Form 10-Q. You should carefully consider the risks and uncertainties described below, together with all of the other information included in this Form 10-Q, in considering our business and prospects. The risks and uncertainties described below are not the only ones facing Amkor. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also adversely affect our business operations. The occurrence of any of the risks and uncertainties described below could materially and adversely affect our business, liquidity, results of operations, financial condition or cash flows.

Summary of Risk Factors

An investment in our common stock involves various risks, and you are urged to carefully consider all of the matters discussed in Part II, Item 1A of this Form 10-Q under the caption “Risk Factors” (in addition to those discussed under this “Summary of Risk Factors” section) in considering our business and prospects. The following is a list of some of these risks:

Risks Related to Our Business, Operations and Industry

•dependence on the cyclical and volatile semiconductor industry and vulnerability to industry downturns and declines in global economic and financial conditions;

•changes in costs, quality, availability and delivery times of raw materials, components and equipment;

•fluctuations in operating results and cash flows;

•competition with established competitors in the packaging and test business, the internal capabilities of integrated device manufacturers (“IDMs”), and other competitors, including foundries and contract manufacturers;

•our substantial investments in equipment and facilities to support the demand of our customers;

•warranty claims, product return and liability risks, and the risk of negative publicity if our products fail, as well as the risk of litigation incident to our business;

•difficulty achieving the relatively high-capacity utilization rates necessary to realize satisfactory gross margins given our high percentage of fixed costs;

•our absence of backlog and the short-term nature of our customers’ commitments;

•the historical downward pressure on the prices of our packaging and test services;

•fluctuations in our manufacturing yields;

•a downturn or lower sales to customers in the automotive industry;

•dependence on key customers or concentration of customers in certain end markets, such as mobile communications and automotive;

•difficulty funding our liquidity needs; and

•challenges with integrating diverse operations.

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Risks Related to Our International Sales and Operations

•dependence on international factories and operations, and risks relating to trade restrictions and regional conflict, including restrictive trade barriers, export controls, tariffs, customs and duties.

Risks Related to Cybersecurity, Data Privacy and Intellectual Property

•our ability to develop new proprietary technology, protect our proprietary technology, operate without infringing the proprietary rights of others, and implement new technologies; and

•our continuing development and implementation of changes to, and maintenance and security of, our information technology systems.

Risks Related to Our Indebtedness

•restrictive covenants in the indentures and agreements governing our current and future indebtedness;

•our substantial indebtedness;

•the effect of interest rate increases on our variable rate indebtedness; and

•fluctuations in interest rates and changes in credit risk.

Risks Related to Our Common Stock

•the ability of certain of our stockholders to effectively determine or substantially influence the outcome of matters requiring stockholder approval; and

•the possibility that we may decrease or suspend our quarterly dividend.

Risks Related to Human Capital and Management

•difficulty attracting, retaining or replacing qualified personnel.

Risks Related to Regulatory, Legal and Tax Challenges

•maintaining an effective system of internal controls;

•any changes in tax laws, taxing authorities not agreeing with our interpretation of applicable tax laws, including whether we continue to qualify for conditional reduced tax rates, or any requirements to establish or adjust valuation allowances on deferred tax assets;

•environmental, health and safety liabilities and expenditures; and

•conditions and obligations in connection with the receipt of government awards and incentives.

General Risk Factors

•natural disasters and other calamities, health conditions or pandemics, political instability, hostilities or other disruptions.

Risks Related to Our Business, Operations and Industry

Our packaging and test services are used in volatile industries, and industry downturns and declines in global economic and financial conditions could harm our performance.

Our business is impacted by market conditions in the semiconductor industry, which is cyclical by nature and impacted by broad economic factors, such as worldwide gross domestic product and consumer spending. The semiconductor industry has experienced significant and sometimes sudden and prolonged downturns in the past. If the industry or markets in which we compete experience slower, or even negative growth, our business and results of operations may be materially and adversely affected.

Since our business is, and will continue to be, dependent on the requirements of semiconductor companies for outsourced packaging and test services, any downturn in the semiconductor industry or any other industry that uses a significant

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number of semiconductor devices, such as communications, computing, automotive and industrial or consumer electronics, could have a material adverse effect on our business and operating results. During downturns, we have experienced, among other things, reduced demand, excess capacity and reduced sales. For example, in recent years, the macroeconomic environment has experienced uncertainty related to evolving tariff and trade policies, geopolitical tensions, inflationary pressures, labor market shortages and disputes, changes in interest rates, supply chain disruptions, foreign currency fluctuations and periods of volatility in global capital markets.

Our business may suffer if the cost, quality or supply of materials or equipment changes adversely.

We obtain the materials and equipment required for the packaging and test services performed by our factories from various vendors. We source most of our materials, including critical materials such as leadframes, laminate substrates and gold wire, from a limited group of suppliers. A disruption to the operations of one or more of our suppliers could extend lead times for materials and equipment and have a negative impact on our business. For example, geopolitical events, including the ongoing conflicts in the Middle East and tensions between China and Taiwan, could disrupt global supply chains and adversely affect the availability and cost of materials and equipment, and furthermore, fire, severe weather, earthquakes, flooding and tsunamis in the past have impacted the supply of specialty chemicals, substrates, silicon wafers, equipment and other supplies to the electronics industry.

In addition, we purchase the majority of our materials on a purchase order basis. Our business may be harmed if we cannot obtain materials and other supplies from our vendors in a timely manner, in sufficient quantities, at acceptable quality or at competitive prices or are unable to increase our prices sufficiently to recover inflationary price increases in materials or supplies. Some of our customers are also dependent on a limited number of suppliers for certain materials, including memory and silicon wafers. Shortages or disruptions in our customers’ supply channels, including any disruptions arising out of the conflicts in Ukraine and Israel and the Middle East or other future conflicts, could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We also rely on raw materials, including steel and other construction materials, in connection with construction and expansion projects, such as our Arizona Facility. Any shortages or delays in procuring such construction materials can materially delay construction milestones, which could have a material adverse effect on our business, financial condition, results of operations and cash flows.

SEC rules and related industry initiatives require diligence and disclosure regarding the use of certain minerals originating from the conflict zones of the Democratic Republic of Congo and adjoining countries. Many of our customers’ initiatives require us to certify that the covered materials we use in our packages do not come from the conflict areas. We incur costs associated with complying with these requirements and customer initiatives, and we may be required to increase our efforts in the future to cover additional materials and geographic areas. These requirements and customer initiatives could affect the pricing, sourcing and availability of materials used in the manufacture of semiconductor devices, and we cannot assure you that we will be able to obtain conflict-free materials or other materials covered by customer initiatives in sufficient quantities and at competitive prices or that we will be able to verify the origin of all of the materials we procure. If we are unable to meet these requirements and customer initiatives, some customers may move their business to other suppliers, and our reputation and business could be materially and adversely affected.

We purchase new packaging and test equipment to maintain and expand our operations. From time to time, increased demand for new equipment or supply chain disruptions and economic turbulence may cause lead times to extend beyond those normally required by equipment vendors. In periods of increased demand and reduced availability, equipment suppliers may delay orders or only partially satisfy our equipment orders in the normal time frame. The unavailability of equipment or failures to deliver equipment on a timely basis could delay or impair our ability to meet customer orders. If we are unable to meet customer orders, we could lose potential and existing customers. Generally, we acquire our equipment on a purchase order basis and do not enter into long-term equipment agreements. As a result, depending on market conditions, we could experience adverse changes in pricing, currency risk and potential shortages in equipment, any of which could have a material adverse effect on our results of operations.

We are a large buyer of gold and other commodity materials, including substrates and copper. The prices of gold and other commodities used in our business fluctuate. Historically, we have been able to partially offset the effect of commodity price increases through price adjustments to some customers and changes in our product designs that reduce the material content and cost, such as the use of shorter, thinner gold wire and migration to copper wire. However, we

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typically do not have long-term contracts that permit us to impose price adjustments, and market conditions may limit our ability to do so. Significant price increases may materially and adversely impact our gross margin in future periods to the extent we are unable to pass along past or future commodity price increases to our customers.

Our operating results and cash flows have varied and may vary significantly as a result of factors that we cannot control.

Many factors could have a material adverse effect on our net sales, gross profit, operating results and cash flows or lead to significant variability of quarterly or annual operating results. Our profitability and ability to generate cash from operations is principally dependent upon demand for semiconductors, the utilization of our capacity, semiconductor package mix, the average selling price of our services, our ability to manage our capital expenditures and our ability to control our costs including labor, material, overhead and financing costs.

Our net sales, gross margin, gross profit, operating income, net income and cash flows have historically fluctuated significantly from quarter to quarter as a result of many of the following factors, over which we have little or no control and which we expect to continue to impact our business:

•fluctuations in demand for semiconductors and conditions in the semiconductor industry generally, as well as by specific customers, such as inventory reductions by our customers impacting demand in key markets;

•changes in cost, quality, availability and delivery times of raw materials, components, equipment and labor;

•inflation, including wage inflation, and fluctuations in energy prices and commodity prices, including gold, silver, copper and other precious metals;

•our ability to achieve our major growth objectives, including transitioning second-wave customers to advanced packages and increasing our share of the automotive and industrial end market;

•changes in our capacity and capacity utilization rates;

•fluctuations in interest rates and currency exchange rates;

•changes in average selling prices which can occur quickly due to the absence of long-term agreements on price;

•changes in the mix of the semiconductor packaging and test services that we sell;

•fluctuations in our manufacturing yields;

•the development, transition and ramp to high volume manufacture of more advanced silicon nodes and evolving wafer, packaging and test technologies may cause production delays, lower manufacturing yields and supply constraints for new wafers and other materials;

•the absence of backlog, the short-term nature of our customers’ commitments, double bookings by customers and deterioration in customer forecasts and the impact of these factors, including the possible delay, rescheduling and cancellation of large orders, or the timing and volume of orders relative to our production capacity;

•the timing of expenditures in anticipation of future orders;

•changes in effective tax rates;

•the availability and cost of financing;

•leverage and debt covenants;

•intellectual property transactions and disputes;

•warranty and product liability claims and the impact of quality excursions and customer disputes and returns;

•costs associated with legal claims, indemnification obligations, judgments and settlements;

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•political instability, conflicts (such as the ongoing war between Russia and Ukraine, conflicts in the Middle East, tensions between China and Taiwan and recent U.S. military action in Venezuela) and government shutdowns, civil disturbances and international events;

•environmental or natural disasters such as earthquakes, typhoons and volcanic eruptions;

•pandemics or other widespread illnesses that may impact our labor force, operations, liquidity, supply chain and end-user demand for products which incorporate semiconductors;

•costs of acquisitions and divestitures and difficulties integrating acquisitions;

•our ability to attract and retain qualified personnel to support our global operations;

•our ability to penetrate new end markets or expand our business in existing end markets;

•dependence on key customers or concentration of customers in certain end markets, such as mobile communications and automotive; and

•restructuring charges, asset write-offs and impairments.

In recent years, the U.S. Bureau of Industry and Security has announced export control regulations applicable to the sale of U.S. semiconductor technology in China (collectively, the “BIS Regulations”). The above factors, in addition to the BIS Regulations and other similarly restrictive trade barriers adopted by U.S. and foreign governments applicable to the semiconductor supply chain, could impact our business and the businesses of our customers. These factors may have a material and adverse effect on our business, liquidity, results of operations, financial condition and cash flows or lead to significant volatility in our quarterly or annual operating results. In addition, these factors may materially and adversely affect our credit ratings, which could make it more difficult and expensive for us to raise capital and could materially and adversely affect the price of our securities.

We compete against established competitors in the packaging and test business as well as internal capabilities of IDMs and face competition from foundries and contract manufacturers.

The outsourced semiconductor packaging and test services market is very competitive. We face substantial competition from established and emerging packaging and test service providers primarily located in Asia, including companies with significantly greater processing capacity, financial resources, local presence, research and development operations, marketing, technology and other capabilities. In addition, we may compete with electronics manufacturing service providers or contract electronics manufacturers that also provide advanced integrated device solutions. We also may face increased competition from domestic companies located in China, where there are government-supported efforts to promote and subsidize the development and growth of the local semiconductor industry. We may be at a disadvantage in attempting to compete with entities associated with such government-supported initiatives based on their lower cost of capital, access to government resources and incentives, preferential sourcing practices, stronger local relationships or otherwise. Our competitors may also have established relationships, or enter into new strategic relationships, with one or more of the large semiconductor companies that are our current or potential customers or key suppliers to these customers. Consolidation among our competitors could also strengthen their competitive position.

Historically, we have also been dependent on the trend in outsourcing of packaging and test services by IDM and foundry customers. Our IDM and foundry customers continually evaluate the need for outsourced services against their own in-house packaging and test services. As a result, at any time and for a variety of reasons, IDMs and foundries may decide to shift some or all of their outsourced packaging and test services to internally sourced capacity. To the extent we limit capacity commitments for certain customers, these customers may increase their level of in-house packaging and test capabilities, which could make it more difficult for us to regain their business when we have available capacity. If we experience a significant loss of IDM or foundry business, it could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows, especially during a prolonged industry downturn.

We face competition from foundries, which offer full turnkey services from silicon wafer fabrication through packaging and final test. These foundries, which are substantially larger than us and have greater financial resources than we do, have expanded their operations to include packaging and test services and may continue to expand these capabilities in the future. If a key customer decides to purchase wafers from a semiconductor foundry that provides packaging and test

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services, our business could be adversely affected if the customer also engages that foundry for related packaging and test services.

We also face competition from contract manufacturers and electronic manufacturing service providers, many of which are larger than us, have lower cost structures, and may be willing or able to sell their services at lower margins. These competitors have increased and could increase pricing and competitive pressures.

We cannot assure you that we will be able to compete successfully in the future against our existing or potential competitors, that our customers will not rely on internal sources, foundries or contract manufacturers for packaging and test services or that our business, liquidity, results of operations, financial condition or cash flows will not be materially and adversely affected by such increased competition.

We make substantial investments in equipment and facilities to support the demand of our customers, which may materially and adversely affect our business if the demand of our customers does not develop as we expect or is adversely affected.

We make significant investments in equipment and facilities in order to service the demand of our customers. The amount of our capital expenditures depends on several factors, including the performance of our business, our assessment of future industry and customer demand, our capacity utilization levels and availability, advances in technology, our liquidity position and the availability of financing. Our ongoing capital expenditure requirements may strain our cash and liquidity, and, in periods when we are expanding our capital base, we expect that depreciation expense and factory operating expenses associated with capital expenditures to increase production capacity will put downward pressure on our gross profit, at least in the near term. From time to time, we also make significant capital expenditures based on specific business opportunities with one or a few key customers, and the additional equipment purchased may not be readily usable to support other customers. If demand is insufficient to fill our capacity, or we are unable to efficiently redeploy such equipment, our capacity utilization and gross profit could be negatively impacted.

Furthermore, if we cannot generate or raise additional funds to pay for capital expenditures, particularly in some of the advanced packaging and bumping areas, as well as research and development activities, our growth and future profitability may be materially and adversely affected. Our ability to obtain external financing in the future is subject to a variety of uncertainties, including: our future financial condition, results of operations and cash flows; general market conditions for financing; volatility in fixed income, credit and equity markets; and economic, political and other global conditions.

We began delivering advanced packages from the Vietnam Facility in the third quarter of 2024, and we began construction of our Arizona Facility in the second half of 2025. While manufacturing has begun at the Vietnam Facility and construction has begun on our Arizona Facility, there can be no assurance that the actual scope, costs or benefits of these projects will be consistent with our current expectations.

We may face warranty claims, product return and liability risks, economic damage claims and negative publicity if our packages fail.

Our packages are incorporated into a number of end products. If our packages fail, our business may be exposed to warranty claims, product return and liability risks, economic damage claims and negative publicity.

We receive warranty claims from our customers from time to time in the ordinary course of our business. If we were to experience an unusually high incidence of warranty claims, we could incur significant costs and our business could be materially and adversely affected. In addition, we are exposed to the product and economic liability risks and the risk of negative publicity affecting our customers. Our sales may decline if any of our customers are sued on a product liability claim. We also may suffer a decline in sales from the negative publicity associated with such a lawsuit or with adverse public perceptions in general regarding our customers’ products. Further, if our packages are delivered with defects, we could incur additional development, repair or replacement costs or suffer other economic losses, and our credibility and the market’s acceptance of our packages could be harmed.

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Due to our high percentage of fixed costs, we may be unable to maintain satisfactory gross margins if we are unable to achieve relatively high-capacity utilization rates.

Our operations are characterized by high fixed costs and the absence of any material backlog. Our profitability depends in part not only on pricing levels for our packaging and test services but also on the efficient utilization of our human resources and packaging and test equipment. Increases or decreases in our capacity utilization can significantly affect gross margins. Transitions between different packaging technologies can also impact our capacity utilization if we do not efficiently redeploy our equipment for other packaging and test opportunities. We cannot assure you that we will be able to achieve consistently high-capacity utilization, and if we fail to do so, our gross margins may be negatively impacted.

In addition, our fixed operating costs have increased as a result of capital expenditures for capacity expansion. The anticipated customer demand for which we have made capital investments may not materialize, and our sales may not adequately cover fixed costs, resulting in reduced profit levels or even significant losses, either of which may materially and adversely impact our business, liquidity, results of operations, financial condition and cash flows.

The lack of contractually committed customer demand may materially and adversely affect our sales.

Our packaging and test business does not typically operate with any material backlog. Our quarterly net sales from packaging and test services are substantially dependent upon our customers’ demand in that quarter. Generally, our customers do not commit to purchase any significant amount of packaging or test services or provide us with binding forecasts of demand for packaging and test services for any future period, in any material amount. In addition, we sometimes experience double booking by customers, and our customers often reduce, cancel or delay their purchases of packaging and test services for a variety of reasons, including industry-wide, customer-specific and Amkor-specific reasons. This makes it difficult for us to forecast our capacity utilization and net sales in future periods. Since a large portion of our costs is fixed and our expense levels are based in part on our expectations of future sales, we may not be able to adjust costs in a timely manner to compensate for any sales shortfall. If we are unable to adjust costs in a timely manner, our margins, operating results, financial condition and cash flows could be materially and adversely affected.

Historically, there has been downward pressure on the prices of our packaging and test services.

Prices for packaging and test services have generally declined over time, and sometimes prices can change significantly in relatively short periods of time. We expect downward pressure on average selling prices for our packaging and test services to continue in the future, and this pressure may intensify during downturns in business. If we experience declining average selling prices and are unable to offset such declines by developing and marketing new packages with higher prices, reducing our purchasing costs, recovering more of our material cost increases from our customers and reducing our manufacturing costs, our business, liquidity, results of operations, financial condition and cash flows could be materially and adversely affected.

Packaging and test processes are complex, and our production yields and customer relationships may suffer from defects in the services we provide or if we do not successfully implement new technologies.

Semiconductor packaging and test services are complex processes that require significant technological and process expertise, and in line with industry practice, customers usually require us to pass a lengthy and rigorous qualification process that may take several months. Once qualified and in production, defective packages primarily result from one or more of the following:

•contaminants in the manufacturing environment;

•human error;

•equipment malfunction;

•changing processes to address environmental requirements;

•defective raw materials; or

•defective plating services.

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Test is also complex and involves sophisticated equipment and software. Similar to many software programs, these software programs are complex and may contain programming errors or “bugs.” The test equipment is also subject to malfunction, and the test process is subject to operator error.

These and other factors have, from time to time, contributed to lower production yields. They may also do so in the future, particularly as we adjust our capacity, change our processing steps or ramp new technologies. In addition, we must continue to develop and implement new packaging and test technologies and expand our offering of packages to be competitive. Our production yields on new packages, particularly those packages which are based on new technologies, typically are significantly lower than our production yields on our more established packages.

Our failure to qualify new processes, maintain quality standards or acceptable production yields, if significant and prolonged, could result in the loss of customers, increased costs of production, delays, substantial amounts of returned goods and claims by customers relating thereto. Any of these problems could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

A significant portion of our revenue is derived from customers in the automotive industry. A downturn or lower sales to customers in the automotive industry could materially affect our business and results of operations.

A significant portion of our sales is to customers within the automotive industry. The automotive industry is cyclical, and, as a result, our customers in the automotive end-market are sensitive to changes in general economic conditions, inflationary pressure, disruptive innovation and end-market preferences, which can adversely affect sales of our products and, correspondingly, our results of operations. The automotive industry is also subject to long design-in time frames, long product life cycles and a high degree of regulatory and safety requirements, necessitating suppliers to the industry to comply with stringent qualification processes, very low defect rates and high reliability standards, all of which result in significant operational challenges, risk to our results of operations, and increased costs of our investments in serving customers in the automotive end-market. Additionally, the quantity and price of our products sold to customers in the automotive end-market could decline despite continued growth in such end-market. Lower sales to customers in the automotive end-market may have a material adverse effect on our business and results of operations.

The loss of certain customers or reduced orders or pricing from existing customers may have a material adverse effect on our operations and financial results.

We have derived and expect to continue to derive a large portion of our revenues from a small group of customers during any particular period due in part to the concentration of market share in the semiconductor industry. Our ten largest customers accounted for, in the aggregate, 72% of our net sales for the year ended December 31, 2025. In addition, we have significant customer concentration within our end markets. The loss of a significant customer, a business combination among our customers, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant commercial arrangements may result in a decline in our sales and profitability and could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

The demand for our services from each customer is directly dependent upon that customer’s financial health, level of business activity and purchasing decisions, the quality and price of our services, our cycle time and delivery performance, the customer’s qualification of additional competitors on products we package or test and a number of other factors. Each of these factors could vary significantly from time to time resulting in the loss or reduction of customer orders, and we cannot be sure that our key customers or any other customers will continue to place orders with us in the future at the same levels as in past periods.

In addition, from time to time, we may acquire or build new facilities or migrate existing business among our facilities. In connection with these facility changes or new facility constructions, our customers require us to qualify the new facilities even though we have already qualified to perform the services at our other facilities. We cannot assure that we will successfully qualify facility changes, that we will complete construction of new facilities in a timely manner or that our customers will not qualify our competitors and move the business for such services.

We may have difficulty funding liquidity needs.

We assess our liquidity based on our current expectations regarding sales and operating expenses, capital spending, dividend payments, stock repurchases, debt service requirements and other funding needs. We fund our operations, including capital expenditures and other investments and servicing principal and interest obligations with respect to our

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debt, from cash flows from our operations, existing cash and cash equivalents, borrowings under available debt facilities, or proceeds from any additional debt or equity financing. Our liquidity is affected by, among other factors, volatility in the global economy and credit markets, the performance of our business, our capital expenditures and other investment levels, other uses of our cash, including any payments of dividends and purchases of stock under any stock repurchase program, any acquisitions or investments in joint ventures and any decisions we might make to either repay debt and other long-term obligations out of our operating cash flows or refinance debt at or prior to maturity with the proceeds of debt or equity financings.

Servicing our current and future customers requires that we incur significant operating expenses and continue to make significant capital expenditures and other investments, and the amount of our capital expenditures for 2026 and thereafter may vary materially and will depend on several factors. These factors include, among others, the amount, timing and implementation of our capital projects, the performance of our business, economic and market conditions, advances in technology, the cash needs and investment opportunities for the business, the need for additional capacity and facilities and the availability of cash flows from operations or financing.

The health of the worldwide banking system and capital markets also affects our liquidity. If financial institutions that have extended credit commitments to us are adversely affected by the conditions of the United States, foreign or international banking system and capital markets (including as a result of rising interest rates, economic downturns or other developments), they may refuse or be unable to fund borrowings under their credit commitments to us. Volatility in the banking system and capital markets, as well as any further increase in interest rates or adverse economic, political, public health or other global conditions, could also make it difficult or more expensive for us to maintain our existing credit facilities or refinance our debt.

The trading price of our common stock has been, and is likely to continue to be, highly volatile and could be subject to wide fluctuations. Such fluctuations could impact our decision or ability to utilize the equity markets as a potential source of our funding needs in the future.

In addition, there is a risk that we could fail to generate the necessary net income or operating cash flows to meet the funding needs of our business due to a variety of factors, including the other factors discussed in this “Risk Factors” section. If we fail to generate the necessary cash flows or we are unable to access the capital markets when needed, our liquidity could be materially and adversely impacted.

We face challenges as we integrate diverse operations.

We have experienced, and expect to continue to experience, change in the scope and complexity of our operations resulting primarily from existing and future facility and operational consolidations, facility and operational expansions, strategic acquisitions, joint ventures and other partnering arrangements. Some of the risks from these activities include those associated with the following:

•increasing the scope, geographic diversity and complexity of our operations;

•conforming an acquired company’s standards, practices, systems and controls with our operations;

•increasing complexity from combining recent acquisitions of an acquired business;

•unexpected losses of key employees or customers of an acquired business;

•difficulties in the assimilation of acquired operations, technologies or products; and

•diversion of management and other resources from other parts of our operations and adverse effects on existing business relationships with customers.

In connection with these activities, we may:

•incur costs associated with personnel reductions and voluntary retirement programs;

•record restructuring charges to cover costs associated with facility consolidations and related cost reduction initiatives;

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•use a significant portion of our available cash;

•incur substantial debt;

•issue equity securities, which may dilute the ownership of current stockholders;

•incur or assume known or unknown contingent liabilities; and

•incur large, immediate accounting write offs and face antitrust or other regulatory inquiries or actions.

For example, the businesses we have acquired had, at the time of acquisition, multiple systems for managing their own production, sales, inventory and other operations. Migrating these businesses to our systems typically is a slow, expensive process requiring us to divert significant resources from other parts of our operations. We may continue to face these challenges in the future. As a result of the risks discussed above, the anticipated benefits of these or other future acquisitions, consolidations and partnering arrangements may not be fully realized, if at all, and these activities could have a material adverse effect on our business, financial condition and results of operations.

Risks Related to Our International Sales and Operations

Our factories and operations, and those of our customers and vendors, are located in various foreign jurisdictions, which exposes us to risks arising from international trade restrictions and regional conflict.

We provide packaging and test services through our factories and other operations located in China, Japan, Korea, Malaysia, the Philippines, Portugal, Singapore, Taiwan and Vietnam. A significant portion of our property, plant and equipment is located outside of the United States, and many of our customers and the vendors in our supply chain are also located outside the United States. The following are some of the risks we face in doing business internationally:

•restrictive trade barriers considered or adopted by U.S. and foreign governments applicable to the semiconductor supply chain, including laws, rules, regulations and policies in areas such as national security, licensing requirements for exports, tariffs, customs and duties, including the export rules and regulations applicable to U.S. companies that sell certain semiconductor and chipmaking equipment products to customers in China;

•international trade disputes, geopolitical tensions, increasing protectionism and economic nationalism leading to increasing export restrictions, trade barriers, tariffs, and other changes in trade policy, or reactionary measures in response thereto, including retaliatory tariffs, legal challenges or currency manipulation;

•laws, rules, regulations and policies within China and other countries that may favor domestic companies over non-domestic companies, including customer- or government-supported efforts to promote the development and growth of local competitors;

•health and safety concerns, including widespread outbreak of infectious diseases and governmental responses thereto;

•changes in consumer demand resulting from current or expected inflation or other variations in local economies;

•laws, rules, regulations and policies imposed by U.S. or foreign governments in areas such as data privacy, cybersecurity, antitrust and competition, tax, currency and banking, labor, environmental, and health and safety;

•the payment of dividends and other payments by non-U.S. subsidiaries may be subject to prohibitions, limitations or taxes in local jurisdictions;

•fluctuations in currency exchange rates, particularly the U.S. dollar to Japanese yen exchange rate for our operations in Japan;

•political and social conditions, and the potential for civil unrest, terrorism or other hostilities (such as the ongoing war between Russia and Ukraine, conflicts in the Middle East, tensions between China and Taiwan and recent U.S. military action in Venezuela);

•disruptions or delays in shipments caused by customs brokers or government agencies;

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•difficulties in attracting and retaining qualified personnel and managing foreign operations, including foreign labor disruptions;

•difficulty in enforcing contractual rights and protecting our intellectual property rights;

•potentially adverse tax consequences resulting from tax laws in the United States and in other jurisdictions; and

•local business and cultural factors that differ from our normal standards and practices, including business practices that we are prohibited from engaging in by the U.S. Foreign Corrupt Practices Act and other anti-corruption laws and regulations.

Many of these factors and risks are present and may be heightened within our business operations in China. For example, changes in U.S.-China relations, the political environment or international trade policies could result in further revisions to laws or regulations or their interpretation and enforcement, increased taxation, trade sanctions, the imposition of import or export duties and tariffs, restrictions on imports or exports, currency revaluations or retaliatory actions, including retaliatory tariffs, legal challenges or currency manipulation, which have had and may continue to have an adverse effect on our business plans and operating results. Additionally, the BIS Regulations place limitations on the ability of companies to export certain advanced computing semiconductor chips, as well as chipmaking equipment, by requiring companies to obtain licenses to export such products and equipment into China or other designated countries. These expanded export restrictions limit our ability to sell to certain Chinese companies and to third parties that do business with those companies. Certain of Amkor’s competitors may be exempt from the BIS Regulations by virtue of being non-U.S. manufacturers. To the extent required, Amkor would evaluate pursuing export licenses and authorizations, but there can be no assurances that Amkor would obtain such licenses or authorizations on a timely or cost-effective basis or at all, or that our customers will not reroute business that would have otherwise been given to Amkor to one or more of our competitors as a result of the BIS Regulations, particularly if our competitors have, or are not required to have, required licenses or authorizations that we have not obtained. It is also possible that government agencies in China or in other countries may adopt retaliatory export control rules in response to the BIS Regulations, which could further impact our business, liquidity, results of operations, financial condition and cash flows. These restrictions have created, and these and similar restrictions may continue to create, uncertainty and caution with our current or prospective customers and may cause them to amass large inventories of our products, replace our products with products from another supplier that is not subject to the export restrictions or focus on building indigenous semiconductor capacity to reduce reliance on U.S. suppliers. Furthermore, if these export restrictions cause our current or potential customers to view U.S. companies as unreliable, we could suffer reputational damage or lose business to foreign competitors who are not subject to such export restrictions, and our business could be materially harmed. We are continuing to evaluate the impact of these restrictions on our business, but these actions may have direct and indirect material adverse impacts on our revenues and results of operations in China and elsewhere. In addition, our success in the Chinese markets may be adversely affected by China’s evolving policies, laws and regulations, including those relating to antitrust, cybersecurity, data protection and data privacy, the environment, indigenous innovation and the promotion of a domestic semiconductor industry and intellectual property rights and enforcement and protection of those rights.

Over the course of 2025, the United States government announced multiple tariff changes for goods imported into the United States from numerous countries, as well as product-based sectoral tariffs. The U.S. government also announced various export control changes. Some countries countered with tariffs, export control changes or other actions, and the U.S. entered into broad trade negotiations with many countries. Many of the U.S. actions, as well as those of other countries, were subsequently paused or revised. These developments, or the perception that any of them could occur, may have a material adverse effect on global economic conditions and the stability of global financial markets, and may significantly reduce global trade. We cannot predict what further actions may ultimately be taken by the U.S. with respect to tariffs, export restrictions or other trade measures, what products or entities may be subject to such actions, or what actions may be taken by other countries in response to these U.S. actions. Any of these factors could depress economic activity, restrict our access to suppliers or customers and adversely affect the semiconductor supply chain. Imposed tariffs may affect end-user demand in each geography where our customers sell their products and services, which may materially and adversely affect demand for our services, our operating results and our financial condition.

We also have significant facilities and other investments in Korea, and there have been heightened security concerns in recent years stemming from North Korea’s nuclear weapon and long-range missile programs as well as its military

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actions in the region. Furthermore, there has been a history of conflict and tension within and among other countries in the region.

Global pandemics and the spread of infectious diseases may impact our operations and the operations of our customers and suppliers as a result of illness, quarantines, facility closures and travel and logistics restrictions in connection with such outbreaks. National, regional and local governments may implement public health measures to mitigate the spread of such outbreaks in jurisdictions in which we, our customers and our suppliers operate, and such restrictions may materially and adversely impact our operations and the operations of our customers and suppliers. Such restrictions may also affect end-user demand in each geography where our customers sell their products and services, which may materially and adversely affect demand for our services, our operating results and our financial condition.

Risks Related to Cybersecurity, Data Privacy and Intellectual Property

Our business will suffer if we are not able to develop new proprietary technology, protect our proprietary technology and operate without infringing the proprietary rights of others.

The complexity and scope of semiconductor packaging, SiP modules and test services are rapidly increasing. As a result, we expect to develop, acquire and implement new manufacturing processes and packaging technologies and tools in order to respond to competitive industry conditions and customer requirements. Technological advances may lead to rapid and significant price erosion and may make our existing packages less competitive or our existing inventories obsolete. If we cannot achieve advances in packaging design or obtain access to advanced packaging designs developed by others, our business could suffer.

The need to develop and maintain advanced packaging capabilities and equipment could require significant research and development, capital expenditures and acquisitions in future years. In addition, converting to new packaging designs or process methodologies could result in delays in producing new package types, which could impact our ability to meet customer orders and materially and adversely impact our business.

Although we seek patent protection for some of our technology under U.S. and foreign patent laws, the process of seeking patent protection takes a long time and is expensive. There can be no assurance that patents will issue from pending or future applications or that, if patents are issued, the rights granted under the patents will provide us with meaningful protection or any commercial advantage. Any patents we do obtain may be challenged, invalidated or circumvented and will eventually expire. As a result, such patents may not offer us meaningful protection or provide the commercial advantage for which they were designed.

Some of our technologies are not covered by any patent or patent application. The confidentiality agreements on which we rely to protect these technologies may be breached or may not be adequate to protect our proprietary technologies. There can be no assurance that other countries in which we market our services will protect our intellectual property rights to the same extent as the United States.

Our competitors may develop, patent or gain access to know-how and technology similar or superior to our own. The semiconductor industry is characterized by frequent claims regarding the infringement of patent and other intellectual property rights. If any third party makes an enforceable infringement claim against us or our customers, we could be required to:

•discontinue the use of certain processes or cease to provide the services at issue, which could curtail our business;

•pay substantial damages;

•develop non-infringing technologies, which may not be feasible; or

•acquire licenses to such technology, which may not be available on commercially reasonable terms or at all.

We may need to enforce our patents or other intellectual property rights, including our rights under patent and intellectual property licenses with third parties, or defend ourselves against claimed infringement of the rights of others through litigation, which could result in substantial cost and diversion of our resources and may not be successful. Furthermore, if we fail to obtain necessary licenses, our business could suffer, and we could be exposed to claims for damages and injunctions from third parties, as well as claims from our customers for indemnification. Unfavorable

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outcomes in any legal proceedings involving intellectual property could result in significant liabilities or loss of commercial advantage and could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows. The potential impact from the legal proceedings referred to in this Form 10-Q on our results of operations, financial condition and cash flows could change in the future.

We face risks in connection with the continuing development and implementation of changes to, and maintenance and security of, our information technology systems.

We depend on our information technology systems for many aspects of our business. Our systems may be susceptible to damage, disruptions or shutdowns due to failures during the process of upgrading, replacing or maintaining software, databases or components thereof, power outages, hardware failures, interruption, failures or vulnerabilities in the systems of third-parties (including those with access to our systems or data, such as customers or vendors), computer viruses, attacks by computer hackers, ransomware, phishing or other cybersecurity attacks, telecommunication failures, user errors, malfeasance or catastrophic events. Threat actors may utilize emerging technologies, such as AI and machine learning, to compromise our information technology systems. Such events have occurred in the past and may occur in the future. Cybersecurity breaches could result in unauthorized disclosure of confidential information, disruptions to our operations and/or impacts to a third party with which we have a relationship, such as a customer or vendor, which could result in reputational, competitive, operational or other business harms as well as financial costs and regulatory action. While we have not experienced a material information security breach, we cannot be sure that such a breach will not occur in the future. The information technology systems in our factories are at varying levels of sophistication and maturity as the factories have different sets of products, processes and customer expectations. Some of our key software has been developed by our own programmers, and this software may not be easily integrated with other software and systems. From time to time, we make additions or changes to our information technology systems. For example, we continue to further integrate information technology systems in our facilities in Japan into our existing systems and processes. We face risks in connection with current and future projects to install or integrate new information technology systems or upgrade our existing systems. These risks include, but are not limited to:

•delays in the design and implementation of the system;

•costs may exceed our plans and expectations; and

•disruptions resulting from the implementation, integration or cybersecurity breach of the systems may impact our ability to process transactions and delay shipments to customers, impact our results of operations or financial condition or harm our control environment.

For example, we are in the process of implementing a new enterprise resource planning (ERP) system. Large-scale technology implementations of this nature are inherently complex and involve significant investment in human and financial resources. Implementation of the new ERP system and related systems could result in significant potential risks, including failure of the systems to operate as designed, unexpected impacts on related systems or processes, potential loss or corruption of data, failures in security processes and internal controls, cost overruns, implementation delays or errors, disruption of operations and the potential inability to meet business and reporting requirements, any of which could materially and adversely affect our business, financial condition, results of operations and cash flows.

Our business could be materially and adversely affected if our information technology systems are disrupted or if we are unable to successfully install new systems or improve, upgrade, integrate or expand upon our existing systems. We maintain insurance policies for various types of information security risks, including network security and privacy liability for third party claims, and business interruption and system failure reimbursement coverage, but we do not carry insurance for all the above referred risks. With regard to the insurance we do maintain, we cannot assure you that it would be sufficient to cover all of our potential losses. As a result, our business, financial condition, results of operations and cash flows could be materially and adversely affected by a disruption, failure or breach of our information technology systems.

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Risks Related to Our Indebtedness

Covenants in the indentures and agreements governing our current and future indebtedness could restrict our operating flexibility.

The indentures and agreements governing our existing debt contain, and debt we incur in the future may contain, affirmative and negative covenants that materially limit our ability to take certain actions, including our ability to incur debt, pay dividends and repurchase stock, make certain investments and other payments, enter into certain mergers and consolidations, engage in sale leaseback transactions and encumber and dispose of assets. In addition, certain of our debt agreements contain, and our future debt agreements may contain, financial covenants and ratios.

The breach of any of these covenants by us, or the failure by us to meet any of the financial ratios or conditions, could result in a default under any or all of such indebtedness. If a default occurs under any such indebtedness, all of the outstanding obligations thereunder could become immediately due and payable, which could result in a default under our other outstanding debt and could lead to an acceleration of obligations related to other outstanding debt. The existence of such a default or event of default could also preclude us from borrowing funds under our revolving credit facilities. Our ability to comply with the provisions of the indentures, credit facilities and other agreements governing our outstanding debt and indebtedness we may incur in the future can be affected by events beyond our control, and a default under any debt instrument, if not cured or waived, could have a material adverse effect on us.

Our substantial indebtedness could have a material adverse effect on our financial condition and prevent us from fulfilling our obligations.

We have a substantial amount of debt, and the terms of the agreements governing our indebtedness allow us and our subsidiaries to incur more debt, subject to certain limitations. As of March 31, 2026, our total debt balance was $1,414.2 million, of which $157.0 million was classified as a current liability and $924.5 million was collateralized indebtedness. We may consider investments in joint ventures, increased capital expenditures, refinancings or acquisitions which may increase our indebtedness. If new debt is added to our consolidated debt level, the related risks that we face could increase.

Our substantial indebtedness could:

•make it more difficult for us to satisfy our obligations with respect to our indebtedness, including our obligations under our indentures to purchase notes tendered as a result of a change in control of Amkor;

•increase our vulnerability to general adverse economic and industry conditions;

•limit our ability to fund future working capital, capital expenditures, research and development and other business opportunities, including joint ventures and acquisitions;

•require us to dedicate a substantial portion of our cash flow from operations to service payments of interest and principal on our debt, thereby reducing the availability of our cash flow to fund future working capital, capital expenditures, research and development expenditures and other general corporate requirements;

•increase the volatility of the price of our common stock;

•limit our flexibility to react to changes in our business and the industry in which we operate;

•place us at a competitive disadvantage to any of our competitors that have less debt;

•limit, along with the financial and other covenants in our indebtedness, our ability to borrow additional funds;

•limit our ability to refinance our existing indebtedness, particularly during periods of adverse credit market conditions when refinancing indebtedness may not be available under interest rates and other terms acceptable to us or at all; and

•increase our cost of borrowing.

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If interest rates increase, our debt service obligations under our variable rate indebtedness would increase, which could have a material adverse effect on our results of operations.

Borrowings under our credit facility, including the outstanding term loan, are at variable rates of interest and as a result expose us to interest rate risk. Interest rates increased throughout 2022 and 2023. While interest rates stabilized and have begun to decrease since 2024, if interest rates increase, our debt service obligations on the variable rate indebtedness would increase even though the amount borrowed remained the same, and our net income and cash flows, including cash available for servicing our indebtedness, will correspondingly decrease. We currently do not maintain interest rate swaps with respect to all of our variable rate indebtedness, and any swaps we enter into may not fully mitigate our interest rate risk. To the extent the risk materializes and is not fully mitigated, the resulting increase in interest expense could have a material adverse effect on our results of operations. Further, significant changes in our credit rating, disruptions in the global financial markets, including bank failures, or incurrence of new or refinancing of existing indebtedness at higher interest rates could have a material and adverse effect on our access to and cost of capital for future financings, and financial condition.

We are exposed to fluctuations in interest rates and changes in credit risk, which could have a material adverse impact on our earnings as it relates to the market value of our investment portfolio.

We maintain an investment portfolio of various holdings, types and maturities. Our portfolio includes available-for-sale debt investments, the values of which are subject to market price volatility resulting from interest rate movements, changes in credit risk and financial market conditions. If such investments suffer market price declines, we may recognize in earnings the decline in the fair value of our investments below their cost basis when the decline is judged to be an impairment, including an allowance for credit loss.

Risks Related to Our Common Stock

Susan Y. Kim and members of her family can effectively determine or substantially influence the outcome of all matters requiring stockholder approval.

As of March 31, 2026, Susan Y. Kim, the Chairman of our Board of Directors, and members of the Kim family and affiliates owned approximately 122.1 million shares, or approximately 49.3%, of our outstanding common stock. The Kim family also has options to acquire approximately 0.6 million shares. If the options are exercised, the Kim family’s total ownership would be an aggregate of approximately 122.7 million shares, or approximately 49.4% of our outstanding common stock.

In June 2013, the Kim family exchanged convertible notes issued by Amkor in 2009 for approximately 49.6 million shares of common stock (the “Convert Shares”). As of March 31, 2026, the Kim family owns approximately 29.6 million Convert Shares. The Convert Shares owned by the Kim family are subject to a voting agreement. The voting agreement requires the Kim family to vote these shares in a “neutral manner” on all matters submitted to our stockholders for a vote, so that such Convert Shares are voted in the same proportion as all of the other outstanding securities (excluding the other shares owned by the Kim family) that are actually voted on a proposal submitted to Amkor’s stockholders for approval. The Kim family is not required to vote in a “neutral manner” any Convert Shares that, when aggregated with all other voting shares held by the Kim family, represent 41.6% or less of the total then-outstanding voting shares of our common stock. The voting agreement for the Convert Shares terminates upon the earliest of (i) such time as the Kim family no longer beneficially owns any of the Convert Shares, (ii) consummation of a change of control (as defined in the voting agreement) or (iii) the mutual agreement of the Kim family and Amkor.

Ms. Kim and her family and affiliates, acting together, have the ability to effectively determine or substantially influence matters submitted for approval by our stockholders including the election of our Board of Directors, by voting their shares or otherwise acting by written consent. There is also the potential, through the election of members of our Board of Directors, that the Kim family could substantially influence matters decided upon by our Board of Directors. This concentration of ownership may also have the effect of impeding a merger, consolidation, takeover or other business consolidation involving us, or discouraging a potential acquirer from making a tender offer for our shares, and could also negatively affect our stock’s market price or decrease any premium over market price that an acquirer might otherwise pay. Concentration of ownership also reduces the public float of our common stock. There may be less liquidity and higher price volatility for the stock of companies with a smaller public float compared to companies with broader public

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ownership. Also, the sale or the prospect of the sale of a substantial portion of the Kim family shares may cause the market price of our stock to decline significantly.

We may decrease or suspend our quarterly dividend, and any decrease in or suspension of the dividend could cause our stock price to decline.

Since October 2020, we have declared a regular quarterly cash dividend on our outstanding common stock. However, the payment, amount and timing of future cash dividends are subject to the final determination each quarter by our Board of Directors or a committee thereof that there are sufficient funds available to lawfully pay a dividend, that the dividend is compliant with the applicable restrictions in our debt agreements and that the payment of the dividend remains in our and our stockholders’ best interests. The determination will be based on our results of operations, financial condition, cash requirements, debt restrictions and other factors. Given these considerations, we may increase or decrease the amount of the dividend at any time and may also decide to vary the timing of or suspend the payment of dividends in the future. Any decrease or suspension of dividend payments could cause our stock price to decline.

Risks Related to Human Capital and Management

We face risks trying to attract, retain or replace qualified employees to support our operations.

Our success depends to a significant extent upon the continued service of our key senior management, sales and technical personnel, any of whom may be difficult to replace. Competition for qualified employees is intensifying, accelerated by increasing competition in the semiconductor industry for talent to meet strong demand, and our business could be materially and adversely affected by the loss of the services of any of our existing key personnel, including senior management and technical talent, as a result of competition or for any other reason. Labor shortages could also result in higher wages that would increase our labor costs, which could reduce our profits. Although we have entered into agreements with our Chief Executive Officer and certain other executives that would prevent them from working for, or impose financial penalties for doing business with, our competitors in the event that those executives cease working for us, we cannot assure you that we will be successful in our efforts to retain or replace key employees or in hiring and properly training sufficient numbers of qualified personnel and in effectively managing our growth. Our inability to attract, retain, motivate and train qualified new personnel could have a material adverse effect on our business.

Risks Related to Regulatory, Legal and Tax Challenges

If we fail to maintain an effective system of internal controls, we may not be able to accurately report financial results or prevent fraud.

Our internal controls over financial reporting may not prevent or detect misstatements because of their inherent limitations, including the possibility of human error, the circumvention or overriding of controls and fraud or corruption. Therefore, even effective internal controls can provide only reasonable assurance with respect to the preparation and fair presentation of financial statements. In addition, projections concerning the effectiveness of internal controls in future periods are subject to the risk that our internal controls may become inadequate because of changes in conditions, or that the degree of compliance with our policies or procedures may deteriorate.

We assess our internal controls and systems on an ongoing basis, and from time-to-time, we update and make modifications to our global enterprise resource planning system. We have implemented several significant enterprise resource planning and shop floor management systems and expect to implement additional similar systems in the future. There is a risk that deficiencies may occur that could constitute significant deficiencies or, in the aggregate, a material weakness.

If we fail to remedy any deficiencies or maintain the adequacy of our internal controls, we could be subject to regulatory scrutiny, civil or criminal penalties or shareholder litigation. In addition, failure to maintain adequate internal controls could result in financial statements that do not accurately reflect our operating results or financial condition.

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We could suffer adverse tax and other financial consequences if there are changes in tax laws or taxing authorities do not agree with our interpretation of applicable tax laws, including whether we continue to qualify for conditional reduced tax rates, or if we are required to establish or adjust valuation allowances on deferred tax assets.

We earn a substantial portion of our income in foreign countries, and our operations are subject to tax in multiple jurisdictions with complicated and varied tax regimes. Tax laws and income tax rates in these jurisdictions are subject to change due to economic and political conditions. Changes in the tax laws of foreign jurisdictions could arise as a result of the base erosion and profit shifting project that was undertaken by the Organization for Economic Cooperation and Development (“OECD”). The OECD, which represents a coalition of member countries, recommended changes to long-standing tax principles related to transfer pricing and has developed model rules including establishing a global minimum corporate income tax tested on a jurisdictional basis (the “Pillar Two Model Rules”). Some countries we operate in have enacted laws based on the Pillar Two Model Rules, which has adversely affected our effective tax rate, expected tax payments and conditional reduced tax rates.

The OECD’s 2026 introduction of the Side-by-Side (“SbS”) framework may impact our future tax obligations and compliance requirements. Although the United States has been designated as a qualified SbS jurisdiction, enabling U.S.-parented companies to elect relief from certain provisions of the Pillar Two Model Rules beginning in 2026, many jurisdictions continue to require QDMTT and may adopt additional administrative rules that affect our operations. There remains significant uncertainty regarding the pace and consistency of global implementation. Our ability to accurately forecast tax obligations and the impact on our financial results may be affected.

On July 4, 2025, the OBBBA was enacted in the United States, which includes significant provisions such as modifications to the international tax framework and the investment tax credit rate under the CHIPS Act, and restoration of tax treatment for certain business provisions. The legislation has multiple effective dates, with certain provisions effective in 2025 and others implemented through 2027. Changes in U.S. or foreign tax laws, including new or modified guidance with respect to existing tax laws, could have a material adverse impact on our liquidity, results of operations, financial condition and cash flows.

Our tax liabilities are based, in part, on our corporate structure, interpretations of various U.S. and foreign tax laws, including withholding tax, compliance with conditional reduced tax rate requirements, application of changes in tax law to our operations and other relevant laws of applicable taxing jurisdictions. From time to time, taxing authorities may conduct examinations of our income tax returns and other regulatory filings. We cannot assure you that the taxing authorities will agree with our interpretations, including whether we continue to qualify for conditional reduced tax rates. If they do not agree, we may seek to enter into settlements with the taxing authorities. We may also appeal a taxing authority’s determination to the appropriate governmental authorities, but we cannot be sure we will prevail. If we do not prevail or if we enter into settlements with taxing authorities, we may have to make significant payments or otherwise record charges (or reduce tax assets) that materially and adversely affect our results of operations, financial condition and cash flows. Additionally, certain of our subsidiaries operate under conditional reduced tax rates, which will expire in whole or in part at various dates in the future. As those conditional reduced tax rates expire, we expect that our tax expense will increase as income from those jurisdictions becomes subject to higher statutory income tax rates, thereby reducing our liquidity and cash flow.

We monitor on an ongoing basis our ability to utilize our deferred tax assets and whether there is a need for a related valuation allowance. In evaluating our ability to recover our deferred tax assets in the jurisdiction from which they arise, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax-planning strategies and recent results of operations. In the event taxable income falls short of current expectations, we may need to establish a valuation allowance against such deferred tax assets that, if required, could materially and adversely affect our results of operations.

Environmental, health and safety liabilities and expenditures could have a material adverse effect on our business, results of operation and financial condition.

Environmental, health and safety laws and regulations in places we do business impose various controls on the use, storage, handling, discharge and disposal of chemicals used or generated in, or emitted by, our production processes, on the factories we occupy and on the materials contained in semiconductor products. For example, at our foreign facilities we produce liquid waste when semiconductor wafers are diced into chips with the aid of diamond saws, then cooled with running water. In addition, semiconductor packages have historically utilized metallic alloys containing lead within the

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interconnect terminals typically referred to as leads, pins or balls. The European Union’s Restriction of Hazardous Substances in Electrical and Electronic Equipment directive and similar laws in other jurisdictions, including China, impose strict restrictions on the placement into the market of electrical and electronic equipment containing lead and certain other hazardous substances. We may become liable under these and other environmental, health and safety laws and regulations, including for the cost of compliance and cleanup of any disposal or release of hazardous materials arising out of our former or current operations, or otherwise as a result of the emission of greenhouse gases (“GHG”) or other chemicals, the existence of hazardous materials on our properties or the existence of hazardous substances in the products for which we perform our services. We could also be held liable for damages, including fines, penalties and the cost of investigations and remedial actions, and we could be subject to revocation of permits, which may materially and adversely affect our ability to maintain or expand our operations. Additionally, if Amkor is unable to align its environmental, health and safety practices with shifting customer preferences, we could suffer reputational harm, which could have a material and adverse effect on our business, results of operations, liquidity and cash flows.

There has also been an increase in regulatory and public attention and industry and customer focus on the materials contained in semiconductor products, the environmental impact of semiconductor operations and the risk of chemical releases from such operations, climate change, sustainability and related environmental concerns. Increased regulation of and restriction on the use of hazardous substances may impact our supply chain due to decreased availability, necessitate changes in our packaging processes, require us to seek substitutes that may not be readily available in the marketplace or eliminate the use of such hazardous substances although there may not be a technically feasible alternative. This increased focus on sustainability and the environmental impact of semiconductor operations and products has caused industry groups and customers to impose additional requirements on us and our suppliers, sometimes exceeding regulatory standards. These industry and customer requirements include increased tracking and reporting of GHG emissions, reductions in waste and wastewater from operations, additional reporting on the materials and components used in the products for which we perform our services, and the use of renewable energy sources in our factory operations. In addition, recent and ongoing changes to climate change regulation could increase our compliance costs, including as a result of carbon pricing impacts on electrical utilities as well as increased indirect costs resulting from our customers, suppliers, and other stakeholders incurring additional compliance costs that are passed on to us. We have started to incur compliance costs within our existing manufacturing infrastructure, and such costs may increase as we expand our manufacturing capacity. To comply with these additional requirements, we may need to procure additional, or increase the use of, renewable energy, procure additional equipment or make factory or process changes, which could result in increased operating costs.

The awards and incentives from the agreement with the Commerce Department pursuant to the CHIPS Act might not materialize as such awards and incentives are conditional upon achieving or maintaining certain outcomes and compliance with other obligations, are subject to reduction, termination, or clawback and would impose certain restrictions on our business.

In December 2024, the Commerce Department awarded us up to $407 million in direct funding pursuant to the CHIPS Act for the Arizona Facility. This award requires us to achieve construction and production milestones and restricts us from undertaking certain activities. We cannot guarantee that we will successfully achieve and maintain outcomes or be able to comply with other obligations required to qualify for this award or that the Commerce Department will provide or continue to provide such funding. The award arrangements provide the Commerce Department with rights to audit our compliance with their terms and obligations, and such audits could result in modifications to, or termination of, the award. To a lesser extent, we also receive incentives from state and local governments for the Arizona Facility, which have similar terms and conditions. Any awards or incentives we receive could be subject to reduction, termination, or clawback, and any decrease, termination, or clawback of such government awards and incentives could have a material adverse effect on our business, results of operations or financial condition.

General Risk Factors

Our business and financial condition has been adversely affected, and could be adversely affected in the future, by natural disasters and other calamities, health conditions or pandemics, political instability, hostilities or other disruptions.

We have significant packaging and test services and other operations in China, Japan, Korea, Malaysia, the Philippines, Portugal, Singapore, Taiwan and Vietnam, and the Arizona Facility is a new factory under construction in the United States. Such operations are or could be subject to: natural disasters, such as earthquakes, tsunamis, typhoons, floods,

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droughts, extreme heat, volcanoes and other severe weather and geological events, and other calamities, such as fire; the outbreak of infectious diseases (such as Covid-19 and other coronaviruses, Ebola or flu); industrial strikes; government-imposed travel restrictions or quarantines; breakdowns of equipment; difficulties or delays in obtaining materials, equipment, utilities and services, including electricity and water; political events or instability; sanctions imposed by the U.S. and other countries in connection with geopolitical tensions; changes in trade policies, including the imposition of tariffs, export controls or other trade barriers; acts of war or armed conflict (such as ongoing war between Russia and Ukraine, conflicts in the Middle East, tensions between China and Taiwan and recent U.S. military action in Venezuela); terrorist incidents and other hostilities in regions where we have facilities; and industrial accidents and other events, that could disrupt or even shut down our operations. While our global manufacturing footprint may allow us to shift production to other factories without substantial cost or production delays, certain of our services are currently performed using equipment located in one or only a subset of our factories. A major disruption or shutdown of any such factory could completely impair our ability to perform those services or require us to shift them to another location. As a result, our ability to fulfill customer orders may be impaired or delayed, and we could incur significant losses.

For example, in April 2016, our Kumamoto factory was damaged by earthquakes in Japan. As a result of these earthquakes, our sales were reduced due to the temporary disruption in operations, and we incurred earthquake-related costs for damaged inventory, buildings and equipment. Our suppliers and customers also have significant operations in such locations, and this could compound the effect of any such disruption. In the event of such a disruption or shutdown, we may be unable to reallocate production to other facilities in a timely or cost-effective manner (if at all), and we may not have sufficient capacity, or customer approval, to service customer demands in our other facilities. A natural disaster or other calamity, political instability, the occurrence of hostilities or other event that results in a prolonged disruption to our operations, or the operations of our customers or suppliers, could have a material adverse effect on our business, financial condition, results of operations and cash flows.

In addition, some of the processes that we utilize in our operations place us at risk of fire and other damage. For example, highly flammable gases are used in the preparation of wafers holding semiconductor devices for flip chip packaging.

We maintain insurance policies for various types of property, casualty and other risks, but we do not carry insurance for all the above referred risks. With regard to the insurance we do maintain, we cannot assure you that it would be sufficient to cover all of our potential losses. As a result, our business, financial condition, results of operations and cash flows could be materially and adversely affected by natural disasters and other calamities.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Repurchase of Equity Securities

The following table provides information regarding repurchases of our common stock during the three months ended March 31, 2026.


Period	Total Number of Shares Purchased (a)	Average Price Paid Per Share ($)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (b)	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs ($) (b)
January 1 - January 31	—	$	—	—	$	—
February 1 - February 28	90,948	47.75		—	—
March 1 - March 31	21,922	42.55		—	—
Total	112,870	$	46.74	—

(a)Represents shares of common stock surrendered to us to satisfy tax withholding obligations associated with the shares issued to employees in connection with share-based compensation.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

On February 17, 2026, Megan Faust, Amkor’s Executive Vice President, Chief Financial Officer and Treasurer adopted a “Rule 10b5-1 trading arrangement” as such term is defined in paragraph (a) of Item 408 of Regulation S-K promulgated under the Securities Act, which is intended to satisfy the affirmative defense of Rule 10b5-1(c). Ms. Faust’s Rule 10b5-1 trading arrangement will terminate on the earliest of: (a) February 26, 2027; (b) the first date on which all trades have been executed or all trading orders relating to such trades have expired; and (c) the date on which Ms. Faust gives notice to terminate her Rule 10b5-1 trading arrangement. 10,000 shares of our common stock are to be sold under Ms. Faust’s Rule 10b5-1 trading arrangement.

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Underwriting Agreement, dated as of February 12, 2026, by and among Amkor Technology, Inc., 915 Investments, LP, and Goldman Sachs & Co. LLC, as the underwriter

Item 6. Exhibits

Incorporated by Reference

Included Herewith

Exhibit Number

Exhibit Description

Form

Period Ending

Exhibit

Filing Date

1.1

8-K

1.1

2/13/26

31.1

Certification of Kevin K. Engel , Chief Executive Officer of Amkor Technology, Inc., pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended

31.2

Certification of Megan Faust, Chief Financial Officer of Amkor Technology, Inc., pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended

Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002*

101.INS

Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document

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Inline XBRL Taxonomy Extension Schema Document

101.CAL

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Inline XBRL Taxonomy Extension Definition Linkbase Document

104

Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

*Furnished herewith.

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Organization, Consolidation and Presentation of Financial Statements [Abstract]

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

AMKOR TECHNOLOGY, INC.



			By:			/s/ Megan Faust
						Megan Faust
						Executive Vice President,
						Chief Financial Officer and Treasurer
						(Principal Financial Officer)

Date: April 28, 2026

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EX-31.1 2 amkr3312026ex311.htm EX-31.1 Document

Exhibit 31.1

SECTION 302 CERTIFICATION

I, Kevin K. Engel, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Amkor Technology, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.


			/s/ Kevin K. Engel
			Kevin K. Engel
			President and Chief Executive Officer

April 28, 2026

EX-31.2 3 amkr3312026ex312.htm EX-31.2 Document

Exhibit 31.2

SECTION 302 CERTIFICATION

I, Megan Faust, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Amkor Technology, Inc.;

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.


			/s/ Megan Faust
			Megan Faust
			Executive Vice President,
			Chief Financial Officer and Treasurer

April 28, 2026

EX-32 4 amkr3312026ex32.htm EX-32 Document

Exhibit 32

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

For purposes of Section 1350 of Chapter 63 of Title 18 of the United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Amkor Technology, Inc., a Delaware corporation (the “Company”), does hereby certify, to such officer’s knowledge, that the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026 (the “Form 10-Q”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)) and that the information contained in the Form 10-Q fairly presents in all material respects the financial condition and results of operations of the Company.


/s/ Kevin K. Engel
By:			Kevin K. Engel
Title:			President and Chief Executive Officer
Date:			April 28, 2026


/s/ Megan Faust
By:			Megan Faust
Title:			Executive Vice President,
			Chief Financial Officer and Treasurer
Date:			April 28, 2026

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COVER PAGE - shares	3 Months Ended
COVER PAGE - shares	Mar. 31, 2026	Apr. 21, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	000-29472
Entity Registrant Name	AMKOR TECHNOLOGY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-1722724
Entity Address, Address Line One	2045 East Innovation Circle
Entity Address, City or Town	Tempe
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85284
City Area Code	480
Local Phone Number	821-5000
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	AMKR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		247,872,518
Entity Central Index Key	0001047127
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false

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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Net sales	$ 1,684,701	$ 1,321,575
Cost of sales	1,445,669	1,163,992
Gross profit	239,032	157,583
Selling, general and administrative	96,987	80,408
Research and development	41,758	45,652
Total operating expenses	138,745	126,060
Operating income	100,287	31,523
Interest expense	17,710	16,809
Other (income) expense, net	(13,731)	(11,075)
Total other expense, net	3,979	5,734
Income before taxes	96,308	25,789
Income tax expense	12,342	3,936
Net income	83,966	21,853
Net income attributable to non-controlling interests	(615)	(725)
Net income attributable to Amkor	$ 83,351	$ 21,128
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.34	$ 0.09
Diluted (in dollars per share)	$ 0.33	$ 0.09
Shares used in computing per common share amounts:
Basic (in shares)	247,550	246,854
Diluted (in shares)	249,570	247,845

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 83,966	$ 21,853
Other comprehensive income (loss), net of tax:
Adjustments to net unrealized gains (losses) on available-for-sale debt investments	(2,541)	1,127
Adjustments to unrealized components of defined benefit pension plans	(123)	(2,480)
Foreign currency translation	1,108	3,874
Total other comprehensive income (loss)	(1,556)	2,521
Comprehensive income	82,410	24,374
Comprehensive income attributable to non-controlling interests	(615)	(725)
Comprehensive income attributable to Amkor	$ 81,795	$ 23,649

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CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 1,121,183	$ 1,378,347
Restricted cash	175	0
Short-term investments (amortized cost of $729,328 and $612,344 in 2026 and 2025, respectively)	727,317	613,038
Accounts receivable, net of allowances	1,287,879	1,354,825
Inventories	494,620	437,797
Other current assets	120,435	100,754
Total current assets	3,751,609	3,884,761
Property, plant and equipment, net	4,150,783	3,870,808
Operating lease right of use assets	90,278	93,449
Goodwill	17,775	18,003
Restricted cash	67,804	67,776
Other assets	220,385	201,512
Total assets	8,298,634	8,136,309
Current liabilities:
Short-term borrowings and current portion of long-term debt	157,038	162,430
Trade accounts payable	832,101	912,766
Capital expenditures payable	488,731	243,543
Short-term operating lease liability	23,570	23,140
Accrued expenses	365,339	370,093
Total current liabilities	1,866,779	1,711,972
Long-term debt	1,257,156	1,282,816
Pension and severance obligations	67,947	69,218
Long-term operating lease liabilities	44,194	48,549
Other non-current liabilities	493,416	517,467
Total liabilities	3,729,492	3,630,022
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	0	0
Common stock, $0.001 par value, 500,000 shares authorized; 294,394 and 293,756 shares issued; and 247,828 and 247,303 shares outstanding in 2026 and 2025, respectively	294	294
Additional paid-in capital	2,060,642	2,054,051
Retained earnings	2,689,683	2,627,038
Accumulated other comprehensive income (loss)	15,277	16,833
Treasury stock, at cost, 46,566 and 46,453 shares in 2026 and 2025, respectively	(232,385)	(227,110)
Total Amkor stockholders’ equity	4,533,511	4,471,106
Non-controlling interests in subsidiaries	35,631	35,181
Total equity	4,569,142	4,506,287
Total liabilities and equity	$ 8,298,634	$ 8,136,309

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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Short term investments amortized cost	$ 729,328	$ 612,344
Stockholders’ equity:
Preferred stock designated Series A, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock designated Series A, shares authorized (in shares)	10,000	10,000
Preferred stock designated Series A, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	500,000	500,000
Common stock, shares issued (in shares)	294,394	293,756
Common stock, shares outstanding (in shares)	247,828	247,303
Treasury stock, shares (in shares)	46,566	46,453

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Total Amkor Stockholders’ Equity	Common Stock	Additional Paid- In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest in Subsidiaries
Balance at beginning of period, common stock (in shares) at Dec. 31, 2024			293,052
Balance at beginning of period at Dec. 31, 2024	$ 4,183,165	$ 4,149,545	$ 293	$ 2,031,643	$ 2,335,132	$ 7,510	$ (225,033)	$ 33,620
Balance at beginning of period, treasury stock (in shares) at Mar. 31, 2025							(46,427)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,853	21,128			21,128			725
Other comprehensive income (loss)	2,521	2,521				2,521
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(59)
Treasury stock acquired through surrender of shares for tax withholding	(1,319)	(1,319)					$ (1,319)
Issuance of stock through share-based compensation plans (in shares)			430
Issuance of stock through share-based compensation plans	769	769		769
Share-based compensation	4,196	4,196		4,196
Cash dividends declared	(20,430)	(20,430)			(20,430)
Subsidiary dividends to non-controlling interests	(165)							(165)
Balance at end of period, common stock (in shares) at Mar. 31, 2025			293,482
Balance at end of period at Mar. 31, 2025	$ 4,190,590	4,156,410	$ 293	2,036,608	2,335,830	10,031	$ (226,352)	34,180
Balance at end of period, treasury stock (in shares) at Dec. 31, 2024							(46,368)
Balance at beginning of period, common stock (in shares) at Dec. 31, 2025	247,303		293,756
Balance at beginning of period at Dec. 31, 2025	$ 4,506,287	4,471,106	$ 294	2,054,051	2,627,038	16,833	$ (227,110)	35,181
Balance at beginning of period, treasury stock (in shares) at Mar. 31, 2026	(46,566)						(46,566)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 83,966	83,351			83,351			615
Other comprehensive income (loss)	(1,556)	(1,556)				(1,556)
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(113)
Treasury stock acquired through surrender of shares for tax withholding	(5,275)	(5,275)					$ (5,275)
Issuance of stock through share-based compensation plans (in shares)			638
Issuance of stock through share-based compensation plans	500	500		500
Share-based compensation	6,091	6,091		6,091
Cash dividends declared	(20,706)	(20,706)			(20,706)
Subsidiary dividends to non-controlling interests	$ (165)							(165)
Balance at end of period, common stock (in shares) at Mar. 31, 2026	247,828		294,394
Balance at end of period at Mar. 31, 2026	$ 4,569,142	$ 4,533,511	$ 294	$ 2,060,642	$ 2,689,683	$ 15,277	$ (232,385)	$ 35,631
Balance at end of period, treasury stock (in shares) at Dec. 31, 2025	(46,453)						(46,453)

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.08352	$ 0.08269

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities:
Net income	$ 83,966	$ 21,853
Depreciation and amortization	170,903	153,821
Other operating activities and non-cash items	(5,871)	5,967
Changes in assets and liabilities	(103,911)	(157,492)
Net cash provided by operating activities	145,087	24,149
Cash flows from investing activities:
Payments for property, plant and equipment	(224,605)	(79,897)
Proceeds from sale of property, plant and equipment	7,179	4,209
Proceeds from foreign exchange forward contracts	14,899	16,674
Payments for foreign exchange forward contracts	(16,684)	(15,992)
Payments for short-term investments	(258,469)	(169,720)
Proceeds from sale of short-term investments	14,607	32,345
Proceeds from maturities of short-term investments	127,318	147,825
Other investing activities	1,036	1,502
Net cash used in investing activities	(334,719)	(63,054)
Cash flows from financing activities:
Payments of long-term debt	(27,737)	(25,493)
Payments of finance lease obligations	(14,543)	(15,659)
Payments of dividends	(20,694)	0
Other financing activities	(4,073)	(1,099)
Net cash used in financing activities	(67,047)	(42,251)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(282)	5,172
Net decrease in cash, cash equivalents and restricted cash	(256,961)	(75,984)
Cash, cash equivalents and restricted cash, beginning of period	1,446,123	1,134,312
Cash, cash equivalents and restricted cash, end of period	1,189,162	1,058,328
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	381,637	202,242
Dividends declared and unpaid	0	20,423
Right of use assets acquired through operating lease liabilities	239	395
Right of use assets acquired through finance lease liabilities	4,007	10,645
Property, plant and equipment acquired through exchange and derecognition of right of use assets	5,250	11,507
Grants and incentive receivables recognized for qualified capital expenditures	$ 37,648	$ 2,939

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Interim Financial Statements

3 Months Ended

Mar. 31, 2026

Interim Financial Statements

Restricted Cash. Restricted cash mainly consists of collateral to fulfill construction requirements and funds to be used exclusively for labor costs.

Leases. Total long-term finance lease liabilities as of March 31, 2026 and December 31, 2025 were $94.6 million and $105.0 million, respectively.

Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation.

Unbilled Receivables. Total unbilled receivables as of March 31, 2026 and December 31, 2025 were $276.3 million and $294.1 million, respectively.


	March 31, 2026		December 31, 2025
	(In thousands)
Investment tax credits recorded in:
Other current assets	$	33,604	$	33,604
Other assets	25,707		—
Grants receivable recorded in:
Other current assets	243		—
Other assets	25,073		13,321

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Business Segments, Product Groups and End Markets

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Business Segments, Product Groups and End Markets

The following table presents revenue, profit or loss and significant segment expenses for our single operating segment:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Net sales	$	1,684,701	$	1,321,575
Less:
Materials cost of sales	901,773		692,748
Labor cost of sales	180,549		159,164
Depreciation cost of sales	156,132		139,869
Other cost of sales	207,215		172,211
Selling, general and administrative	96,987		80,408
Research and development	41,758		45,652
Interest expense	17,710		16,809
Income tax expense	12,342		3,936
Other segment items (1)	(13,731)		(11,075)
Segment net income	$	83,966	$	21,853

(1) Other segment items include interest income, foreign currency (gain) loss, net and other (income) expense.

The following tables represent other balances included in net income or that are regularly provided to the Chief Operating Decision Maker (CODM):


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	16,220	$	14,453
Depreciation and amortization expense	170,903		153,821
Capital expenditures	224,605		79,897


	March 31, 2026		December 31, 2025
	(In thousands)
Total assets	$	8,298,634	$	8,136,309

The following table presents our net sales by product group:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Advanced products (1)	$	1,372,001	$	1,063,617
Mainstream products (2)	312,700		257,958
Total net sales	$	1,684,701	$	1,321,575

(1) Advanced products include flip chip, memory and wafer-level processing and related test services.

(2) Mainstream products include all other wirebond packaging and related test services.

Net sales by end market consist of the following:


	For the Three Months Ended March 31,
	2026		2025
Communications (smartphones, tablets)	44	%	40	%
Computing (data center, infrastructure, PC/laptop, storage)	21	%	22	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	21	%	21	%
Consumer (AR & gaming, connected home, home electronics, wearables)	14	%	17	%
Total net sales	100	%	100	%

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Other Income and Expenses [Abstract]

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Other Income and Expense

3 Months Ended

Mar. 31, 2026

Other Income and Expense

Other income and expense consist of the following:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	(16,220)	$	(14,453)
Foreign currency (gain) loss, net	2,486		3,760



Other, net	3		(382)
Total other (income) expense, net	$	(13,731)	$	(11,075)

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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2026
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense of $12.3 million for the three months ended March 31, 2026 reflects income taxes, foreign withholding taxes, minimum taxes and certain tax credits. We monitor on an ongoing basis our ability to utilize our deferred tax assets and whether there is a need for a related valuation allowance. In evaluating our ability to recover our deferred tax assets in the jurisdictions from which they arise, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax-planning strategies and recent results of operations. We maintain a valuation allowance on certain U.S. and foreign deferred tax assets. Such valuation allowances are released as the related tax benefits are realized or when sufficient evidence exists to conclude that it is more likely than not that the deferred tax assets will be realized. Unrecognized tax benefits represent reserves for potential tax deficiencies or reductions in tax benefits that could result from federal, state or foreign tax audits. Gross unrecognized tax benefits were $36.8 million and $36.1 million as of March 31, 2026 and December 31, 2025, respectively. As of March 31, 2026, $34.4 million of our unrecognized tax benefits would reduce our effective tax rate if recognized. Our unrecognized tax benefits are subject to change for effective settlement of examinations, changes in the recognition threshold of tax positions, the expiration of statutes of limitations and other factors. We have tax returns that are open to examination in various jurisdictions for tax years 2013-2025. The open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations related to the amount and/or timing of income, deductions and tax credits. There can be no assurance that the outcome of examinations will be favorable. In certain circumstances where we elect to appeal the results of an examination, we may be required to make tax assessment payments to proceed with the administrative appeal process. Current examinations include 2021 and 2023 Philippine income tax returns, 2022-2024 Japan income tax returns and 2020-2021 California income tax returns.

The entire disclosure for income tax.

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Accumulated Other Comprehensive Income (Loss)

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Earnings Per Share

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Earnings Per Share

The following table summarizes the computation of basic and diluted EPS:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	83,351	$	21,128




Weighted-average number of common shares outstanding - basic	247,550		246,854
Effect of dilutive securities:
Share-based awards	2,020		991
Weighted-average number of common shares outstanding - diluted	249,570		247,845
Net income attributable to Amkor per common share:
Basic	$	0.34	$	0.09
Diluted	0.33		0.09

The following table summarizes the potential shares of common stock that were excluded from diluted EPS because the effect of including these potential shares was anti-dilutive:


	For the Three Months Ended March 31,
	2026	2025
	(In thousands)
Share-based awards	22	38

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Changes in accumulated other comprehensive income (loss), net of tax, consist of the following:


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2025	$	662	$	20,330	$	(4,159)	$	16,833
Other comprehensive income (loss) before reclassifications	(2,540)		74		1,108		(1,358)
Amounts reclassified from accumulated other comprehensive income (loss)	(1)		(197)		—		(198)
Other comprehensive income (loss)	(2,541)		(123)		1,108		(1,556)
Accumulated other comprehensive income (loss) at March 31, 2026	$	(1,879)	$	20,207	$	(3,051)	$	15,277


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2024	$	(510)	$	16,570	$	(8,550)	$	7,510
Other comprehensive income (loss) before reclassifications	1,207		(2,386)		3,874		2,695
Amounts reclassified from accumulated other comprehensive income (loss)	(80)		(94)		—		(174)
Other comprehensive income (loss)	1,127		(2,480)		3,874		2,521
Accumulated other comprehensive income (loss) at March 31, 2025	$	617	$	14,090	$	(4,676)	$	10,031

(1) Amounts reclassified out of accumulated other comprehensive income (loss) are included as other (income) expense, net (Note 3).

(2) Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 12) or other (income) expense, net (Note 3).

(3) Foreign currency translation includes the gain (loss) from net investment hedges (Note 13).

The entire disclosure for equity.

Investments, Debt and Equity Securities [Abstract]

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Investments

3 Months Ended

Mar. 31, 2026

Investments

All of our available-for-sale debt investments as of March 31, 2026 are available to fund current operations and are recorded at fair value (Note 14).

The following table summarizes our cash equivalents and available-for-sale debt investments:


	March 31, 2026
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	1,452	$	—	$	—	$	1,452	$	1,452	$	—
Commercial paper	50,654		—		—		50,654		—		50,654


Money market funds	188,407		—		—		188,407		188,407		—



U.S. government bonds	24,774		1		—		24,775		24,775		—
Variable rate demand notes	1,016		—		—		1,016		—		1,016
Total cash equivalents (2)	266,303		1		—		266,304		214,634		51,670

Short-term investments
Asset-backed securities	89,484		64		(130)		89,418		—		89,418
Certificate of deposits	19,431		—		—		19,431		19,431		—
Commercial paper	64,145		—		—		64,145		—		64,145
Corporate bonds	382,446		169		(1,646)		380,969		—		380,969
Foreign government bonds	6,559		—		(11)		6,548		—		6,548
Mortgage-backed securities	913		—		(2)		911		—		911
Municipal bonds	1,011		1		—		1,012		—		1,012
U.S. government agency bonds	12,713		1		(37)		12,677		—		12,677
U.S. government bonds	140,750		37		(457)		140,330		140,330		—
Variable rate demand notes	8,011		—		—		8,011		—		8,011
Total short-term investments	725,463		272		(2,283)		723,452		159,761		563,691
Total	$	991,766	$	273	$	(2,283)	$	989,756	$	374,395	$	615,361


	December 31, 2025
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	2,501	$	—	$	—	$	2,501	$	2,501	$	—
Commercial paper	63,421		—		—		63,421		—		63,421

Money market funds	359,721		—		—		359,721		359,721		—



U.S. government bonds	21,988		2		—		21,990		21,990		—
Variable rate demand notes	1,007		—		—		1,007		—		1,007
Total cash equivalents	448,638		2		—		448,640		384,212		64,428

Short-term investments
Asset-backed securities	69,433		118		(53)		69,498		—		69,498
Certificate of deposits	10,318		—		—		10,318		10,318		—
Commercial paper	67,967		—		—		67,967		—		67,967
Corporate bonds	334,361		592		(73)		334,880		—		334,880

Mortgage-backed securities	912		2		—		914		—		914
Municipal bonds	3,042		4		—		3,046		—		3,046
U.S. government agency bonds	8,614		—		(12)		8,602		—		8,602
U.S. government bonds	106,705		130		(15)		106,820		106,820		—
Variable rate demand notes	7,053		—		—		7,053		—		7,053
Total short-term investments	608,405		846		(153)		609,098		117,138		491,960
Total	$	1,057,043	$	848	$	(153)	$	1,057,738	$	501,350	$	556,388

(2)For the three months ended March 31, 2026 and 2025, we sold cash equivalent investments for proceeds of $2.0 million and $2.0 million, respectively, and realized no gain or loss on such sales.

The following table summarizes the contractual maturities of our cash equivalents and available-for-sale debt investments as of March 31, 2026:


	Amortized Cost		Fair Value
	(In thousands)
Within 1 year	$	607,243	$	607,159
After 1 year through 5 years	286,115		284,257
After 5 years	8,011		8,011

Asset- and mortgage-backed securities	90,397		90,329
Total	$	991,766	$	989,756

As of March 31, 2026 and December 31, 2025, the amortized cost and the fair market value of our held-to-maturity government bonds (Level 1) maturing within a year were $3.9 million for both periods.

XML 26 R16.htm IDEA: XBRL DOCUMENT

Factoring of Accounts Receivable	3 Months Ended
Factoring of Accounts Receivable	Mar. 31, 2026
Factoring of Accounts Receivable [Abstract]
Factoring of Accounts Receivable	Factoring of Accounts Receivable For certain accounts receivable, we use non-recourse factoring arrangements with third-party financial institutions to manage our working capital and cash flows. Under these arrangements, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the three months ended March 31, 2026 and 2025, we sold receivables totaling $20.9 million and $9.4 million, respectively, net of discounts and fees, which were insignificant for the respective periods.

XML 27 R17.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Property, Plant And Equipment

Property, Plant and Equipment

Property, plant and equipment consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Land	$	240,573	$	247,450
Buildings and improvements	2,334,662		2,353,344
Machinery and equipment	8,167,711		7,946,040
Finance lease assets	210,868		217,855
Furniture, fixtures and other equipment	19,009		18,820
Software and computer equipment	225,627		229,769
Construction in progress	368,538		250,152
Total property, plant and equipment	11,566,988		11,263,430
Accumulated depreciation and amortization	(7,416,205)		(7,392,622)
Total property, plant and equipment, net	$	4,150,783	$	3,870,808

The following table summarizes our depreciation expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Depreciation expense	$	170,780	$	153,699

XML 28 R18.htm IDEA: XBRL DOCUMENT

Accrued Expenses

3 Months Ended

Mar. 31, 2026

Payables and Accruals [Abstract]

Accrued Expenses

Accrued expenses consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Payroll and benefits	$	107,849	$	147,910

Deferred revenue and customer advances	81,826		69,611
Income taxes payable	58,062		32,845
Short-term finance lease liability	40,925		44,046
Accrued interest	16,112		8,972

Accrued pension and severance plan obligations	6,746		6,996
Other accrued expenses	53,819		59,713
Total accrued expenses	$	365,339	$	370,093

XML 29 R19.htm IDEA: XBRL DOCUMENT

Debt

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Debt

Short-term borrowings and long-term debt consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:

5.875% Senior notes, due October 2033	$	500,000	$	500,000
Other:
2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 (1)	—		—
Term A Loans, applicable bank rate plus 1.75%, 5.45% as of March 31, 2026, due May 2030	496,875		500,000
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (2)	—		—
Term loan, fixed rate at 2.12%, due December 2028	150,000		150,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (3)	—		—


Term loan, fixed rate at 1.23%, due December 2026	12,380		16,719
Term loan, fixed rate at 1.59%, due December 2027	34,621		40,074
Term loan, fixed rate at 1.80%, due December 2028	60,641		67,003
Term loan, fixed rate at 2.05%, due December 2029	80,803		87,295
Term loan, fixed rate at 2.42%, due December 2030	89,182		95,080




	1,424,502		1,456,171
Less: Unamortized discount and deferred debt costs, net	(10,308)		(10,925)
Less: Short-term borrowings and current portion of long-term debt	(157,038)		(162,430)
Long-term debt	$	1,257,156	$	1,282,816

(3)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of March 31, 2026, $3.2 million was available to be drawn.

We were in compliance with all debt covenants at March 31, 2026.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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Derivative Instruments and Hedging Activities Disclosure [Abstract]

XML 30 R20.htm IDEA: XBRL DOCUMENT

Pension Plans

3 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

Pension Plans

Foreign Defined Benefit Pension Plans


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Service cost	$	3,038	$	3,261
Interest cost	1,583		1,434
Expected return on plan assets	(1,391)		(1,279)

Recognized actuarial gain	(222)		(119)
Net periodic pension cost	3,008		3,297
Curtailment gain	—		(434)

Total pension expense	$	3,008	$	2,863

The components of net periodic pension cost other than the service cost component are included in other (income) expense, net in our Consolidated Statements of Income.

Defined Contribution Pension Plans

We sponsor defined contribution pension plans in Korea, Malaysia, Taiwan and the U.S. The following table summarizes our defined contribution expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Defined contribution expense	$	10,688	$	9,304

XML 31 R21.htm IDEA: XBRL DOCUMENT

Derivatives

3 Months Ended

Mar. 31, 2026

Derivatives

As of March 31, 2026 and December 31, 2025, our foreign exchange forward contracts consisted of the following:


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts not designated as hedging instruments
Euro dollar	$	25,174	$	165	Other current assets	$	17,880	$	(6)	Accrued expenses
Japanese yen	223,467		1,140		Other current assets	253,313		(848)		Accrued expenses
Korean won	70,103		646		Other current assets	82,752		(601)		Accrued expenses
Philippine peso	10,685		(4)		Accrued expenses	13,114		(76)		Accrued expenses
Singapore dollar	27,696		(30)		Accrued expenses	11,566		(27)		Accrued expenses
Taiwan dollar	40,666		(165)		Accrued expenses	36,598		(59)		Accrued expenses
Total forward contracts not designated as hedging instruments	$	397,791	$	1,752		$	415,223	$	(1,617)


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts designated as net investment hedging instruments
Japanese yen	$	121,243	$	(646)	Accrued expenses	$	123,846	$	425	Other current assets
Total forward contracts designated as net investment hedging instruments	$	121,243	$	(646)		$	123,846	$	425

The following table presents the gain or loss recognized on our derivatives designated as net investment hedging instruments for the three months ended March 31, 2026 and 2025:


		For the Three Months Ended March 31,
	Location on Consolidated Financial Statements	2026		2025
		(In thousands)
Difference between forward rate and spot rate of the forward contracts	Other (income) expense, net	$	(980)	$	(1,318)
Changes in fair value of forward contracts	Other comprehensive income (loss)	$	1,173	$	(4,709)

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

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XML 32 R22.htm IDEA: XBRL DOCUMENT

Fair Value Measurements

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Fair Value Measurements

Our derivative financial instruments are valued using quoted market prices for similar assets. Counterparties to these derivative contracts are highly rated financial institutions.

We also measure certain assets and liabilities, including property, plant and equipment and goodwill, at fair value on a nonrecurring basis.

We measure the fair value of our debt for disclosure purposes. The following table presents the fair value of our debt:


	March 31, 2026				December 31, 2025
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	499,070	$	493,623	$	511,405	$	493,457
Revolving credit facilities and term loans (Level 2)	912,400		920,571		948,501		951,789
Total debt	$	1,411,470	$	1,414,194	$	1,459,906	$	1,445,246

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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XML 33 R23.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We generally warrant that our services will be performed in a professional and workmanlike manner and in compliance with our customers’ specifications. We accrue costs for known warranty issues. Historically, our warranty costs have been immaterial. Legal Proceedings We are involved in claims and legal proceedings and may become involved in other legal matters arising in the ordinary course of our business. We evaluate these claims and legal matters on a case-by-case basis to make a determination as to the impact, if any, on our business, liquidity, results of operations, financial condition or cash flows. Although the outcome of these matters is uncertain, we believe that the ultimate outcome of these claims and proceedings, individually and in the aggregate, will not have a material adverse impact on our business, liquidity, results of operations, financial condition or cash flows. Our evaluation of the potential impact of these claims and legal proceedings could change in the future. In accordance with the accounting guidance for loss contingencies, including legal proceedings, lawsuits, pending claims and other legal matters, we accrue for a loss contingency when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose loss contingencies if we believe they are material and there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred. Commitments We enter into various contracts related to the construction and development of our manufacturing facilities. As of March 31, 2026, the remaining commitments under these contracts were approximately $468 million.

XML 34 R24.htm IDEA: XBRL DOCUMENT

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Megan Faust [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On February 17, 2026, Megan Faust, Amkor’s Executive Vice President, Chief Financial Officer and Treasurer adopted a “Rule 10b5-1 trading arrangement” as such term is defined in paragraph (a) of Item 408 of Regulation S-K promulgated under the Securities Act, which is intended to satisfy the affirmative defense of Rule 10b5-1(c). Ms. Faust’s Rule 10b5-1 trading arrangement will terminate on the earliest of: (a) February 26, 2027; (b) the first date on which all trades have been executed or all trading orders relating to such trades have expired; and (c) the date on which Ms. Faust gives notice to terminate her Rule 10b5-1 trading arrangement. 10,000 shares of our common stock are to be sold under Ms. Faust’s Rule 10b5-1 trading arrangement.
Name	Megan Faust
Title	Executive Vice President, Chief Financial Officer and Treasurer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	February 17, 2026
Expiration Date	February 26, 2027
Arrangement Duration	374 days
Aggregate Available	10,000

XML 35 R25.htm IDEA: XBRL DOCUMENT

Interim Financial Statements (Policies)	3 Months Ended
Interim Financial Statements (Policies)	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation. The Consolidated Financial Statements and related disclosures as of March 31, 2026, and for the three months ended March 31, 2026 and 2025, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited pursuant to the rules and regulations of the SEC. The December 31, 2025 Consolidated Balance Sheet data contained in this Form 10-Q was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to SEC rules and regulations. In our opinion, the Consolidated Financial Statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods and should be read in conjunction with the financial statements included in the 2025 Form 10-K. The results of operations for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for the full year ending December 31, 2026. Unless the context otherwise requires, all references to “Amkor,” “we,” “us” or “our” are to Amkor Technology, Inc. and its wholly and majority-owned subsidiaries.
Use of Estimates	Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments as a result of, for example, any worsening of the global business and economic environment.
Restricted Cash	Restricted Cash. Restricted cash mainly consists of collateral to fulfill construction requirements and funds to be used exclusively for labor costs.
Goodwill	Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation.
Grant Accounting	Grant Accounting. From time to time, we may receive grants from governmental agencies. We recognize grants in our financial statements when there is reasonable assurance that we will comply with conditions attached to the grants and the grants will be received. Investment tax credits and grants receivable recorded reduce the carrying amounts of the qualifying property, plant and equipment in our Consolidated Balance Sheets.
Recently Issued Standards	Recently Issued Standards. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which was subsequently amended and clarified. ASU 2024-03 requires disaggregation of key expense categories such as inventory purchases, employee compensation, depreciation and intangible asset amortization in the financial statements. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. Adoption of this ASU should be applied either prospectively after the effective date or retrospectively to any or all periods presented in the financial statements. We are currently evaluating the impact of this new standard on our financial statements, which is expected to result in enhanced disclosures. In September 2025, the FASB issued ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40) (“ASU 2025-06”). ASU 2025-06 removes all references to project stages throughout ASC 350-40 and clarifies the applicable threshold to begin capitalizing costs. ASU 2025-06 is effective for annual reporting periods beginning after December 15, 2027, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using a prospective transition approach, a modified transition approach based on project status or a retrospective transition approach. We are currently evaluating the impact of this new standard on our financial statements and disclosures. In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832) (“ASU 2025-10”). ASU 2025-10 provides guidance on the accounting for government grants received by a business entity, including grants related to assets and grants related to income. ASU 2025-10 is effective for annual reporting periods beginning after December 15, 2028, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using the following transition methods: (i) a modified prospective approach for government grants that are entered into on or after, or not complete as of, the effective date; (ii) a modified retrospective approach for government grants that are entered into on or after, or not complete as of, the beginning of earliest period presented; or (iii) a retrospective approach for all government grants. We are currently evaluating the impact of this new standard on our financial statements and disclosures.
Income Taxes	We monitor on an ongoing basis our ability to utilize our deferred tax assets and whether there is a need for a related valuation allowance. In evaluating our ability to recover our deferred tax assets in the jurisdictions from which they arise, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax-planning strategies and recent results of operations. We maintain a valuation allowance on certain U.S. and foreign deferred tax assets. Such valuation allowances are released as the related tax benefits are realized or when sufficient evidence exists to conclude that it is more likely than not that the deferred tax assets will be realized.
Commitments and Contingencies	In accordance with the accounting guidance for loss contingencies, including legal proceedings, lawsuits, pending claims and other legal matters, we accrue for a loss contingency when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose loss contingencies if we believe they are material and there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

+ References + Details

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Section S50
-Paragraph 1
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-1

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-Topic 275
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
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-Section 50
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Organization, Consolidation and Presentation of Financial Statements [Abstract]

XML 36 R26.htm IDEA: XBRL DOCUMENT

Interim Financial Statements (Tables)

3 Months Ended

Mar. 31, 2026

Schedule of Government Assistance

The following table presents investment tax credits and grants receivable as of March 31, 2026 and December 31, 2025:


	March 31, 2026		December 31, 2025
	(In thousands)
Investment tax credits recorded in:
Other current assets	$	33,604	$	33,604
Other assets	25,707		—
Grants receivable recorded in:
Other current assets	243		—
Other assets	25,073		13,321

XML 37 R27.htm IDEA: XBRL DOCUMENT

Business Segments, Product Groups and End Markets (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Segment Revenue, Segment Profit or Loss and Balances Included in Net Income

The following table presents revenue, profit or loss and significant segment expenses for our single operating segment:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Net sales	$	1,684,701	$	1,321,575
Less:
Materials cost of sales	901,773		692,748
Labor cost of sales	180,549		159,164
Depreciation cost of sales	156,132		139,869
Other cost of sales	207,215		172,211
Selling, general and administrative	96,987		80,408
Research and development	41,758		45,652
Interest expense	17,710		16,809
Income tax expense	12,342		3,936
Other segment items (1)	(13,731)		(11,075)
Segment net income	$	83,966	$	21,853

(1) Other segment items include interest income, foreign currency (gain) loss, net and other (income) expense.

The following tables represent other balances included in net income or that are regularly provided to the Chief Operating Decision Maker (CODM):


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	16,220	$	14,453
Depreciation and amortization expense	170,903		153,821
Capital expenditures	224,605		79,897


	March 31, 2026		December 31, 2025
	(In thousands)
Total assets	$	8,298,634	$	8,136,309

Schedule of Revenue from External Customers by Products and Services

The following table presents our net sales by product group:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Advanced products (1)	$	1,372,001	$	1,063,617
Mainstream products (2)	312,700		257,958
Total net sales	$	1,684,701	$	1,321,575

(1) Advanced products include flip chip, memory and wafer-level processing and related test services.

(2) Mainstream products include all other wirebond packaging and related test services.

Net sales by end market consist of the following:


	For the Three Months Ended March 31,
	2026		2025
Communications (smartphones, tablets)	44	%	40	%
Computing (data center, infrastructure, PC/laptop, storage)	21	%	22	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	21	%	21	%
Consumer (AR & gaming, connected home, home electronics, wearables)	14	%	17	%
Total net sales	100	%	100	%

XML 38 R28.htm IDEA: XBRL DOCUMENT

Other Income and Expense (Tables)

3 Months Ended

Mar. 31, 2026

Other Income and Expenses [Abstract]

Schedule of Other (Income) Expense

Other income and expense consist of the following:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	(16,220)	$	(14,453)
Foreign currency (gain) loss, net	2,486		3,760



Other, net	3		(382)
Total other (income) expense, net	$	(13,731)	$	(11,075)

XML 39 R29.htm IDEA: XBRL DOCUMENT

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The following table summarizes the computation of basic and diluted EPS:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	83,351	$	21,128




Weighted-average number of common shares outstanding - basic	247,550		246,854
Effect of dilutive securities:
Share-based awards	2,020		991
Weighted-average number of common shares outstanding - diluted	249,570		247,845
Net income attributable to Amkor per common share:
Basic	$	0.34	$	0.09
Diluted	0.33		0.09

Schedule of Antidilutive Effect of Potential Shares of Common Stock that were Excluded from Diluted Earnings Per Share

The following table summarizes the potential shares of common stock that were excluded from diluted EPS because the effect of including these potential shares was anti-dilutive:


	For the Three Months Ended March 31,
	2026	2025
	(In thousands)
Share-based awards	22	38

XML 40 R30.htm IDEA: XBRL DOCUMENT

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss), net of tax, consist of the following:


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2025	$	662	$	20,330	$	(4,159)	$	16,833
Other comprehensive income (loss) before reclassifications	(2,540)		74		1,108		(1,358)
Amounts reclassified from accumulated other comprehensive income (loss)	(1)		(197)		—		(198)
Other comprehensive income (loss)	(2,541)		(123)		1,108		(1,556)
Accumulated other comprehensive income (loss) at March 31, 2026	$	(1,879)	$	20,207	$	(3,051)	$	15,277


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2024	$	(510)	$	16,570	$	(8,550)	$	7,510
Other comprehensive income (loss) before reclassifications	1,207		(2,386)		3,874		2,695
Amounts reclassified from accumulated other comprehensive income (loss)	(80)		(94)		—		(174)
Other comprehensive income (loss)	1,127		(2,480)		3,874		2,521
Accumulated other comprehensive income (loss) at March 31, 2025	$	617	$	14,090	$	(4,676)	$	10,031

(1) Amounts reclassified out of accumulated other comprehensive income (loss) are included as other (income) expense, net (Note 3).

(2) Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 12) or other (income) expense, net (Note 3).

(3) Foreign currency translation includes the gain (loss) from net investment hedges (Note 13).

XML 41 R31.htm IDEA: XBRL DOCUMENT

Investments (Tables)

3 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

Schedule of Debt Securities Available-for-Sale

The following table summarizes our cash equivalents and available-for-sale debt investments:


	March 31, 2026
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	1,452	$	—	$	—	$	1,452	$	1,452	$	—
Commercial paper	50,654		—		—		50,654		—		50,654


Money market funds	188,407		—		—		188,407		188,407		—



U.S. government bonds	24,774		1		—		24,775		24,775		—
Variable rate demand notes	1,016		—		—		1,016		—		1,016
Total cash equivalents (2)	266,303		1		—		266,304		214,634		51,670

Short-term investments
Asset-backed securities	89,484		64		(130)		89,418		—		89,418
Certificate of deposits	19,431		—		—		19,431		19,431		—
Commercial paper	64,145		—		—		64,145		—		64,145
Corporate bonds	382,446		169		(1,646)		380,969		—		380,969
Foreign government bonds	6,559		—		(11)		6,548		—		6,548
Mortgage-backed securities	913		—		(2)		911		—		911
Municipal bonds	1,011		1		—		1,012		—		1,012
U.S. government agency bonds	12,713		1		(37)		12,677		—		12,677
U.S. government bonds	140,750		37		(457)		140,330		140,330		—
Variable rate demand notes	8,011		—		—		8,011		—		8,011
Total short-term investments	725,463		272		(2,283)		723,452		159,761		563,691
Total	$	991,766	$	273	$	(2,283)	$	989,756	$	374,395	$	615,361


	December 31, 2025
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	2,501	$	—	$	—	$	2,501	$	2,501	$	—
Commercial paper	63,421		—		—		63,421		—		63,421

Money market funds	359,721		—		—		359,721		359,721		—



U.S. government bonds	21,988		2		—		21,990		21,990		—
Variable rate demand notes	1,007		—		—		1,007		—		1,007
Total cash equivalents	448,638		2		—		448,640		384,212		64,428

Short-term investments
Asset-backed securities	69,433		118		(53)		69,498		—		69,498
Certificate of deposits	10,318		—		—		10,318		10,318		—
Commercial paper	67,967		—		—		67,967		—		67,967
Corporate bonds	334,361		592		(73)		334,880		—		334,880

Mortgage-backed securities	912		2		—		914		—		914
Municipal bonds	3,042		4		—		3,046		—		3,046
U.S. government agency bonds	8,614		—		(12)		8,602		—		8,602
U.S. government bonds	106,705		130		(15)		106,820		106,820		—
Variable rate demand notes	7,053		—		—		7,053		—		7,053
Total short-term investments	608,405		846		(153)		609,098		117,138		491,960
Total	$	1,057,043	$	848	$	(153)	$	1,057,738	$	501,350	$	556,388

(2)For the three months ended March 31, 2026 and 2025, we sold cash equivalent investments for proceeds of $2.0 million and $2.0 million, respectively, and realized no gain or loss on such sales.

The following table summarizes the contractual maturities of our cash equivalents and available-for-sale debt investments as of March 31, 2026:


	Amortized Cost		Fair Value
	(In thousands)
Within 1 year	$	607,243	$	607,159
After 1 year through 5 years	286,115		284,257
After 5 years	8,011		8,011

Asset- and mortgage-backed securities	90,397		90,329
Total	$	991,766	$	989,756

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
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-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
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-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Property, Plant and Equipment [Abstract]

XML 42 R32.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2026

Schedule of Property, Plant and Equipment

Property, plant and equipment consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Land	$	240,573	$	247,450
Buildings and improvements	2,334,662		2,353,344
Machinery and equipment	8,167,711		7,946,040
Finance lease assets	210,868		217,855
Furniture, fixtures and other equipment	19,009		18,820
Software and computer equipment	225,627		229,769
Construction in progress	368,538		250,152
Total property, plant and equipment	11,566,988		11,263,430
Accumulated depreciation and amortization	(7,416,205)		(7,392,622)
Total property, plant and equipment, net	$	4,150,783	$	3,870,808

The following table summarizes our depreciation expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Depreciation expense	$	170,780	$	153,699

XML 43 R33.htm IDEA: XBRL DOCUMENT

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2026

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Payroll and benefits	$	107,849	$	147,910

Deferred revenue and customer advances	81,826		69,611
Income taxes payable	58,062		32,845
Short-term finance lease liability	40,925		44,046
Accrued interest	16,112		8,972

Accrued pension and severance plan obligations	6,746		6,996
Other accrued expenses	53,819		59,713
Total accrued expenses	$	365,339	$	370,093

XML 44 R34.htm IDEA: XBRL DOCUMENT

Debt (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Short-Term Borrowings and Long-Term Debt

Short-term borrowings and long-term debt consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:

5.875% Senior notes, due October 2033	$	500,000	$	500,000
Other:
2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 (1)	—		—
Term A Loans, applicable bank rate plus 1.75%, 5.45% as of March 31, 2026, due May 2030	496,875		500,000
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (2)	—		—
Term loan, fixed rate at 2.12%, due December 2028	150,000		150,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (3)	—		—


Term loan, fixed rate at 1.23%, due December 2026	12,380		16,719
Term loan, fixed rate at 1.59%, due December 2027	34,621		40,074
Term loan, fixed rate at 1.80%, due December 2028	60,641		67,003
Term loan, fixed rate at 2.05%, due December 2029	80,803		87,295
Term loan, fixed rate at 2.42%, due December 2030	89,182		95,080




	1,424,502		1,456,171
Less: Unamortized discount and deferred debt costs, net	(10,308)		(10,925)
Less: Short-term borrowings and current portion of long-term debt	(157,038)		(162,430)
Long-term debt	$	1,257,156	$	1,282,816

(3)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of March 31, 2026, $3.2 million was available to be drawn.

XML 45 R35.htm IDEA: XBRL DOCUMENT

Pension Plans (Tables)

3 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Pension Cost

The components of net periodic pension cost for these defined benefit pension plans are as follows:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Service cost	$	3,038	$	3,261
Interest cost	1,583		1,434
Expected return on plan assets	(1,391)		(1,279)

Recognized actuarial gain	(222)		(119)
Net periodic pension cost	3,008		3,297
Curtailment gain	—		(434)

Total pension expense	$	3,008	$	2,863

Schedule of Defined Contribution Expense

The following table summarizes our defined contribution expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Defined contribution expense	$	10,688	$	9,304

XML 46 R36.htm IDEA: XBRL DOCUMENT

Derivatives (Tables)

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivative Instruments in Statement of Financial Position

As of March 31, 2026 and December 31, 2025, our foreign exchange forward contracts consisted of the following:


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts not designated as hedging instruments
Euro dollar	$	25,174	$	165	Other current assets	$	17,880	$	(6)	Accrued expenses
Japanese yen	223,467		1,140		Other current assets	253,313		(848)		Accrued expenses
Korean won	70,103		646		Other current assets	82,752		(601)		Accrued expenses
Philippine peso	10,685		(4)		Accrued expenses	13,114		(76)		Accrued expenses
Singapore dollar	27,696		(30)		Accrued expenses	11,566		(27)		Accrued expenses
Taiwan dollar	40,666		(165)		Accrued expenses	36,598		(59)		Accrued expenses
Total forward contracts not designated as hedging instruments	$	397,791	$	1,752		$	415,223	$	(1,617)


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts designated as net investment hedging instruments
Japanese yen	$	121,243	$	(646)	Accrued expenses	$	123,846	$	425	Other current assets
Total forward contracts designated as net investment hedging instruments	$	121,243	$	(646)		$	123,846	$	425

Schedule of Derivative Instruments, Gain (Loss)

The following table presents the gain or loss recognized on our derivatives designated as net investment hedging instruments for the three months ended March 31, 2026 and 2025:


		For the Three Months Ended March 31,
	Location on Consolidated Financial Statements	2026		2025
		(In thousands)
Difference between forward rate and spot rate of the forward contracts	Other (income) expense, net	$	(980)	$	(1,318)
Changes in fair value of forward contracts	Other comprehensive income (loss)	$	1,173	$	(4,709)

XML 47 R37.htm IDEA: XBRL DOCUMENT

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Instruments that are not Recorded at Fair Value on Recurring Basis

The following table presents the fair value of our debt:


	March 31, 2026				December 31, 2025
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	499,070	$	493,623	$	511,405	$	493,457
Revolving credit facilities and term loans (Level 2)	912,400		920,571		948,501		951,789
Total debt	$	1,411,470	$	1,414,194	$	1,459,906	$	1,445,246

XML 48 R38.htm IDEA: XBRL DOCUMENT

Interim Financial Statements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Long-term finance lease liabilities	$ 94,600		$ 105,000
Unbilled receivables	276,300		294,100
Contract liabilities	392,400		390,800
Deferred revenue and customer advances	81,826		$ 69,611
Revenue recognized	16,800	$ 15,200
Customer advance payments received	100,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 283,800
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2031-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2031-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 26,800
Minimum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	1 year
Minimum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2031-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	5 years
Maximum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	5 years
Maximum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2031-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	10 years

XML 49 R39.htm IDEA: XBRL DOCUMENT

Interim Financial Statements - Schedule of Investment Tax Credits and Grants Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investment Tax Credits
Government Assistance [Line Items]
Government assistance, asset, current	$ 33,604	$ 33,604
Government assistance, asset, noncurrent	25,707	0
Grant Receivable
Government Assistance [Line Items]
Government assistance, asset, current	243	0
Government assistance, asset, noncurrent	$ 25,073	$ 13,321

XML 50 R40.htm IDEA: XBRL DOCUMENT

Business Segments, Product Groups and End Markets - Narrative (Details)	3 Months Ended
	Mar. 31, 2026 segment
Segment Reporting [Abstract]
Number of operating segments	1
Number of reportable segments not disclosed flag	single operating segment

XML 51 R41.htm IDEA: XBRL DOCUMENT

Business Segments, Product Groups and End Markets - Schedule of Segment Revenue, Segment Profit or Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Net sales	$ 1,684,701	$ 1,321,575
Selling, general and administrative	96,987	80,408
Research and development	41,758	45,652
Interest expense	17,710	16,809
Income tax expense	12,342	3,936
Net income	83,966	21,853
Reportable Segment
Segment Reporting Information [Line Items]
Net sales	1,684,701	1,321,575
Materials cost of sales	901,773	692,748
Labor cost of sales	180,549	159,164
Depreciation cost of sales	156,132	139,869
Other cost of sales	207,215	172,211
Selling, general and administrative	96,987	80,408
Research and development	41,758	45,652
Interest expense	17,710	16,809
Income tax expense	12,342	3,936
Other segment items	(13,731)	(11,075)
Net income	$ 83,966	$ 21,853

XML 52 R42.htm IDEA: XBRL DOCUMENT

Business Segments, Product Groups and End Markets - Schedule of Balances Included in Net Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Segment Reporting [Abstract]
Interest income	$ 16,220	$ 14,453
Depreciation and amortization expense	170,903	153,821
Capital expenditures	224,605	$ 79,897
Total assets	$ 8,298,634		$ 8,136,309

Amount of asset recognized for present right to economic benefit.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Business Segments, Product Groups and End Markets - Schedule of Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total net sales	$ 1,684,701	$ 1,321,575
Concentration risk (as a percent)	100.00%	100.00%
Advanced products
Segment Reporting Information [Line Items]
Total net sales	$ 1,372,001	$ 1,063,617
Mainstream products
Segment Reporting Information [Line Items]
Total net sales	$ 312,700	$ 257,958
Communications (smartphones, tablets) \| Net sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	44.00%	40.00%
Computing (data center, infrastructure, PC/laptop, storage) \| Net sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	21.00%	22.00%
Automotive, industrial and other (ADAS, electrification, infotainment, safety) \| Net sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	21.00%	21.00%
Consumer (AR & gaming, connected home, home electronics, wearables) \| Net sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	14.00%	17.00%

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Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Other Income and Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Other Income and Expenses [Abstract]
Interest income	$ (16,220)	$ (14,453)
Foreign currency (gain) loss, net	2,486	3,760
Other, net	3	(382)
Total other (income) expense, net	$ (13,731)	$ (11,075)

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Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Income Tax Disclosure [Abstract]
Income tax expense	$ 12,342	$ 3,936
Gross unrecognized tax benefits	36,800		$ 36,100
Unrecognized tax benefits that would impact effective tax rate	$ 34,400

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Earnings Per Share - Schedule of computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Net income attributable to Amkor common stockholders, basic	$ 83,351	$ 21,128
Net income attributable to Amkor common stockholders, diluted	$ 83,351	$ 21,128
Weighted-average number of common shares outstanding - basic (in shares)	247,550	246,854
Effect of dilutive securities:
Share-based awards (in shares)	2,020	991
Weighted-average number of common shares outstanding - diluted (in shares)	249,570	247,845
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.34	$ 0.09
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Earnings Per Share - Schedule of Antidilutive Effect of Potential Shares of Common Stock that were Excluded from Diluted Earnings Per Share (Details) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Share-based awards (in shares)	22	38

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 4,506,287	$ 4,183,165
Total other comprehensive income (loss)	(1,556)	2,521
Balance at end of period	4,569,142	4,190,590
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	16,833	7,510
Other comprehensive income (loss) before reclassifications	(1,358)	2,695
Amounts reclassified from accumulated other comprehensive income (loss)	(198)	(174)
Total other comprehensive income (loss)	(1,556)	2,521
Balance at end of period	15,277	10,031
Unrealized Gains (Losses) on Available-for-Sale Debt Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	662	(510)
Other comprehensive income (loss) before reclassifications	(2,540)	1,207
Amounts reclassified from accumulated other comprehensive income (loss)	(1)	(80)
Total other comprehensive income (loss)	(2,541)	1,127
Balance at end of period	(1,879)	617
Defined Benefit Pension
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	20,330	16,570
Other comprehensive income (loss) before reclassifications	74	(2,386)
Amounts reclassified from accumulated other comprehensive income (loss)	(197)	(94)
Total other comprehensive income (loss)	(123)	(2,480)
Balance at end of period	20,207	14,090
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(4,159)	(8,550)
Other comprehensive income (loss) before reclassifications	1,108	3,874
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	1,108	3,874
Balance at end of period	$ (3,051)	$ (4,676)

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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XML 59 R49.htm IDEA: XBRL DOCUMENT

Investments - Schedule of Cash Equivalents, and Short term Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Total, Amortized Cost	$ 991,766		$ 1,057,043
Total, Gross Unrealized Gains	273		848
Total, Gross Unrealized Losses	(2,283)		(153)
Total Fair Value	989,756		1,057,738
Proceeds from sale of cash equivalent investments	2,000	$ 2,000
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	725,463		608,405
Short-term investments, Gross Unrealized Gains	272		846
Short-term investments, Gross Unrealized Losses	(2,283)		(153)
Short-term investments, Total Fair Value	723,452		609,098
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	89,484		69,433
Short-term investments, Gross Unrealized Gains	64		118
Short-term investments, Gross Unrealized Losses	(130)		(53)
Short-term investments, Total Fair Value	89,418		69,498
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	19,431		10,318
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	19,431		10,318
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	64,145		67,967
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	64,145		67,967
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	382,446		334,361
Short-term investments, Gross Unrealized Gains	169		592
Short-term investments, Gross Unrealized Losses	(1,646)		(73)
Short-term investments, Total Fair Value	380,969		334,880
Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	6,559
Short-term investments, Gross Unrealized Gains	0
Short-term investments, Gross Unrealized Losses	(11)
Short-term investments, Total Fair Value	6,548
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	913		912
Short-term investments, Gross Unrealized Gains	0		2
Short-term investments, Gross Unrealized Losses	(2)		0
Short-term investments, Total Fair Value	911		914
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	1,011		3,042
Short-term investments, Gross Unrealized Gains	1		4
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	1,012		3,046
U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	12,713		8,614
Short-term investments, Gross Unrealized Gains	1		0
Short-term investments, Gross Unrealized Losses	(37)		(12)
Short-term investments, Total Fair Value	12,677		8,602
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	140,750		106,705
Short-term investments, Gross Unrealized Gains	37		130
Short-term investments, Gross Unrealized Losses	(457)		(15)
Short-term investments, Total Fair Value	140,330		106,820
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	8,011		7,053
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	8,011		7,053
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	266,303		448,638
Cash equivalents, Gross Unrealized Gains	1		2
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	266,304		448,640
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	1,452
Cash equivalents, Gross Unrealized Gains	0
Cash equivalents, Gross Unrealized Losses	0
Cash equivalent, Total Fair Value	1,452
Short-term investments, Amortized Cost			2,501
Short-term investments, Gross Unrealized Gains			0
Short-term investments, Gross Unrealized Losses			0
Short-term investments, Total Fair Value			2,501
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	50,654		63,421
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	50,654		63,421
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	188,407		359,721
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	188,407		359,721
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	24,774		21,988
Cash equivalents, Gross Unrealized Gains	1		2
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	24,775		21,990
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	1,016		1,007
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	1,016		1,007
Level 1
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	374,395		501,350
Level 1 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	159,761		117,138
Level 1 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	19,431		10,318
Level 1 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0
Level 1 \| Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	140,330		106,820
Level 1 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	214,634		384,212
Level 1 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	1,452
Short-term investments, Total Fair Value			2,501
Level 1 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0		0
Level 1 \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	188,407		359,721
Level 1 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	24,775		21,990
Level 1 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0		0
Level 2
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	615,361		556,388
Level 2 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	563,691		491,960
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	89,418		69,498
Level 2 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 2 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	64,145		67,967
Level 2 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	380,969		334,880
Level 2 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	6,548
Level 2 \| Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	911		914
Level 2 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	1,012		3,046
Level 2 \| U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	12,677		8,602
Level 2 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 2 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	8,011		7,053
Level 2 \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	51,670		64,428
Level 2 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0
Short-term investments, Total Fair Value			0
Level 2 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	50,654		63,421
Level 2 \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0		0
Level 2 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0		0
Level 2 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	$ 1,016		$ 1,007

XML 60 R50.htm IDEA: XBRL DOCUMENT

Investments - Schedule of Contractual Maturities of Cash Equivalents and Available-for-Sale Debt Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Within 1 year, Amortized Cost	$ 607,243
After 1 year through 5 years, Amortized Cost	286,115
After 5 years, Amortized Cost	8,011
Total, Amortized Cost	991,766	$ 1,057,043
Within 1 year, Fair Value	607,159
After 1 year through 5 years, Fair Value	284,257
After 5 years , Fair Value	8,011
Total Fair Value	989,756	$ 1,057,738
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Asset- and mortgage-backed securities, Amortized Cost	90,397
Asset- and mortgage-backed securities, Fair Value	$ 90,329

XML 61 R51.htm IDEA: XBRL DOCUMENT

Investments - Narrative (Details) - Level 1 - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]
Fair market value of held-to-maturity securities	$ 3.9
Amortized cost of held-to-maturity securities		$ 3.9

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
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-SubTopic 10
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-SubTopic 210
-Name Accounting Standards Codification
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XML 62 R52.htm IDEA: XBRL DOCUMENT

Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 20.9	$ 9.4

XML 63 R53.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment - Schedule of property, plant and equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Finance lease assets	$ 210,868	$ 217,855
Total property, plant and equipment	11,566,988	11,263,430
Accumulated depreciation and amortization	(7,416,205)	(7,392,622)
Total property, plant and equipment, net	4,150,783	3,870,808
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	240,573	247,450
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	2,334,662	2,353,344
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	8,167,711	7,946,040
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	19,009	18,820
Software and computer equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	225,627	229,769
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 368,538	$ 250,152

XML 64 R54.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment - Schedule of Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 170,780	$ 153,699

XML 65 R55.htm IDEA: XBRL DOCUMENT

Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Payables and Accruals [Abstract]
Payroll and benefits	$ 107,849	$ 147,910
Deferred revenue and customer advances	81,826	69,611
Income taxes payable	58,062	32,845
Short-term finance lease liability	40,925	44,046
Accrued interest	16,112	8,972
Accrued pension and severance plan obligations	6,746	6,996
Other accrued expenses	53,819	59,713
Total accrued expenses	$ 365,339	$ 370,093

XML 66 R56.htm IDEA: XBRL DOCUMENT

Debt - Schedule of Debt (Details) $ in Thousands, ₩ in Billions	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2026 KRW (₩)	Dec. 31, 2025 USD ($)	May 31, 2025 USD ($)	May 31, 2024 USD ($) borrowing	May 31, 2024 KRW (₩) borrowing
Debt Instrument [Line Items]
Total debt	$ 1,424,502		$ 1,456,171
Less: Unamortized discount and deferred debt costs, net	(10,308)		(10,925)
Less: Short-term borrowings and current portion of long-term debt	(157,038)		(162,430)
Long-term debt	1,257,156		1,282,816
Short-term term loans, variable rate \| Japan \| Subsidiary Term Loans
Debt Instrument [Line Items]
Total debt	0		0
Borrowing capacity available	$ 3,200
Senior Notes \| 5.875% Senior notes, due October 2033
Debt Instrument [Line Items]
Interest rate (as a percent)	5.875%	5.875%
Total debt	$ 500,000		500,000
Line of Credit \| 2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 \| Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate spread (as a percent)	1.75%
Total debt	$ 0		0
Line of Credit \| 2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity				$ 1,000,000
Increase in maximum borrowing capacity amount				$ 200,000
Current borrowing capacity	$ 1,000,000
Term Loan \| Term A Loans, applicable bank rate plus 1.75%, 6.05% as of June 30, 2025, due May 2030
Debt Instrument [Line Items]
Effective interest rate (as a percent)	5.45%	5.45%
Interest rate spread (as a percent)	1.75%
Total debt	$ 496,875		500,000
Subsidiary Term Loans \| Term loan, fixed rate at 3.95%, due May 2027 \| Korea
Debt Instrument [Line Items]
Interest rate (as a percent)	3.95%	3.95%
Total debt	$ 0		0
Number of annual borrowings \| borrowing					6	6
Borrowing capacity available	$ 53,000	₩ 80.0			$ 59,000	₩ 80.0
Subsidiary Term Loans \| Term loan, fixed rate at 2.12%, due December 2028 \| Korea
Debt Instrument [Line Items]
Interest rate (as a percent)	2.12%	2.12%
Total debt	$ 150,000		150,000
Subsidiary Term Loans \| Term loan, fixed rate at 1.23%, due December 2026 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	1.23%	1.23%
Total debt	$ 12,380		16,719
Subsidiary Term Loans \| Term loan, fixed rate at 1.59%, due December 2027 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	1.59%	1.59%
Total debt	$ 34,621		40,074
Subsidiary Term Loans \| Term loan, fixed rate at 1.80%, due December 2028 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	1.80%	1.80%
Total debt	$ 60,641		67,003
Subsidiary Term Loans \| Term loan, fixed rate at 2.05%, due December 2029 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	2.05%	2.05%
Total debt	$ 80,803		87,295
Subsidiary Term Loans \| Term loan, fixed rate at 2.42%, due December 2030 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	2.42%	2.42%
Total debt	$ 89,182		$ 95,080

XML 67 R57.htm IDEA: XBRL DOCUMENT

Debt - Narrative (Details) $ in Millions	Mar. 31, 2026 USD ($)
Debt Instrument [Line Items]
Collateralized debt	$ 924.5
Asset Pledged as Collateral
Debt Instrument [Line Items]
Collateralized debt	$ 625.6

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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XML 68 R58.htm IDEA: XBRL DOCUMENT

Pension Plans - Schedule of Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Service cost	$ 3,038	$ 3,261
Interest cost	1,583	1,434
Expected return on plan assets	(1,391)	(1,279)
Recognized actuarial gain	(222)	(119)
Net periodic pension cost	3,008	3,297
Curtailment gain	0	(434)
Total pension expense	$ 3,008	$ 2,863

XML 69 R59.htm IDEA: XBRL DOCUMENT

Pension Plans - Schedule of Defined Contribution Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Defined contribution expense	$ 10,688	$ 9,304

XML 70 R60.htm IDEA: XBRL DOCUMENT

Derivatives - Schedule of Fair Value of Derivative Instruments in Statement of Financial Position (Details) - Foreign Exchange Forward - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative notional amount	$ 397,791	$ 415,223
Not Designated as Hedging Instrument \| Euro dollar
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	25,174
Derivative liability, notional amount		17,880
Not Designated as Hedging Instrument \| Japanese yen
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	223,467
Derivative liability, notional amount		253,313
Not Designated as Hedging Instrument \| Korean won
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	70,103
Derivative liability, notional amount		82,752
Not Designated as Hedging Instrument \| Philippine peso
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	10,685	13,114
Not Designated as Hedging Instrument \| Singapore dollar
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	27,696	11,566
Not Designated as Hedging Instrument \| Taiwan dollar
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	40,666	36,598
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative notional amount	121,243	123,846
Designated as Hedging Instrument \| Japanese yen
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount		123,846
Derivative liability, notional amount	121,243
Level 2 \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	1,752	(1,617)
Level 2 \| Not Designated as Hedging Instrument \| Euro dollar
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 165
Derivative liability, fair value		$ (6)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Japanese yen
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 1,140
Derivative liability, fair value		$ (848)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Korean won
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 646
Derivative liability, fair value		$ (601)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Philippine peso
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (4)	$ (76)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Singapore dollar
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (30)	$ (27)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Taiwan dollar
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (165)	$ (59)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Level 2 \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (646)	$ 425
Level 2 \| Designated as Hedging Instrument \| Japanese yen
Derivatives, Fair Value [Line Items]
Derivative asset, fair value		$ 425
Derivative liability, fair value	$ (646)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current

XML 71 R61.htm IDEA: XBRL DOCUMENT

Derivatives - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Derivatives - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	$ (3.6)	$ (2.9)

XML 72 R62.htm IDEA: XBRL DOCUMENT

Derivatives (Schedule of Gain (Loss) Recognized on Derivatives Designated) (Details) - Foreign Exchange Forward - Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivatives, Fair Value [Line Items]
Difference between forward rate and spot rate of the forward contracts	$ (980)	$ (1,318)
Changes in fair value of forward contracts	$ 1,173	$ (4,709)

Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References + Details

XML 73 R63.htm IDEA: XBRL DOCUMENT

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 1,411,470	$ 1,459,906
Fair Value \| Senior notes (Level 1) \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	499,070	511,405
Fair Value \| Revolving credit facilities and term loans (Level 2) \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	912,400	948,501
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	1,414,194	1,445,246
Carrying Value \| Senior notes (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	493,623	493,457
Carrying Value \| Revolving credit facilities and term loans (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 920,571	$ 951,789

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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