v3.26.1
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)