Earnings Per Share

9 Months Ended

Sep. 30, 2022

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, time-vested restricted stock units and unvested restricted shares.

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


	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2022		2021		2022		2021
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	306,081	$	180,854	$	601,522	$	426,469




Weighted-average number of common shares outstanding - basic	244,744		244,100		244,581		243,746
Effect of dilutive securities:
Share-based awards	1,350		1,842		1,434		1,865
Weighted-average number of common shares outstanding - diluted	246,094		245,942		246,015		245,611
Net income attributable to Amkor per common share:
Basic	$	1.25	$	0.74	$	2.46	$	1.75
Diluted	1.24		0.74		2.45		1.74

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 September 30,		For the Nine Months Ended September 30,
	2022	2021	2022	2021
	(In thousands)
Share-based awards	324	180	306	90