Earnings Per Share

12 Months Ended

Dec. 31, 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 includes restricted shares held by retirement eligible recipients and is reduced for treasury stock.

Diluted EPS is computed on the basis of the weighted-average number of shares of common stock 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 computations of basic and diluted EPS:


	For the Year Ended December 31,
	2020		2019		2018
	(In thousands, except per share data)





Net income available to Amkor common stockholders	$	338,138	$	120,888	$	127,092

Weighted-average shares outstanding — basic	241,509		239,725		239,329
Effect of dilutive securities:
Stock options and restricted share awards	739		397		412
Weighted-average shares outstanding — diluted	242,248		240,122		239,741
Net income attributable to Amkor per common share:
Basic	$	1.40	$	0.50	$	0.53
Diluted	1.40		0.50		0.53

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 Year Ended December 31,
	2020	2019	2018
	(In thousands)
Stock options and restricted share awards	2,412	5,379	3,662