Earnings Per Share

9 Months Ended

Sep. 30, 2023

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,
	2023		2022		2023		2022
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	132,614	$	306,081	$	242,251	$	601,522




Weighted-average number of common shares outstanding - basic	245,740		244,744		245,571		244,581
Effect of dilutive securities:
Share-based awards	1,389		1,350		1,509		1,434
Weighted-average number of common shares outstanding - diluted	247,129		246,094		247,080		246,015
Net income attributable to Amkor per common share:
Basic	$	0.54	$	1.25	$	0.99	$	2.46
Diluted	0.54		1.24		0.98		2.45

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,
	2023	2022	2023	2022
	(In thousands)
Share-based awards	—	324	—	306