Earnings Per Share

9 Months Ended

Sep. 30, 2020

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 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,
	2020		2019		2020		2019
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	92,151	$	54,070	$	211,464	$	21,741




Weighted-average number of common shares outstanding - basic	241,675		239,586		241,232		239,503
Effect of dilutive securities:
Stock options and restricted share awards	917		351		705		355
Weighted-average number of common shares outstanding - diluted	242,592		239,937		241,937		239,858
Net income attributable to Amkor per common share:
Basic	$	0.38	$	0.23	$	0.88	$	0.09
Diluted	0.38		0.23		0.87		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 September 30,		For the Nine Months Ended September 30,
	2020	2019	2020	2019
	(In thousands)
Stock options and restricted share awards	858	6,347	2,943	6,487