Earnings Per Share

9 Months Ended

Sep. 30, 2017

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,
	2017		2016		2017		2016
	(In thousands, except per share data)
Net income available to Amkor common stockholders	$	54,435	$	60,089	$	159,936	$	63,927

Weighted-average number of common shares outstanding — basic	239,068		237,353		238,873		237,157
Effect of dilutive securities:
Stock options and restricted share awards	572		839		737		429
Weighted-average number of common shares outstanding — diluted	239,640		238,192		239,610		237,586
Net income attributable to Amkor per common share:
Basic	$	0.23	$	0.25	$	0.67	$	0.27
Diluted	0.23		0.25		0.67		0.27

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,
	2017	2016	2017	2016
	(In thousands)
Stock options and restricted share awards	3,483	1,284	3,463	2,020