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”).


	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: