Quarterly Results (unaudited)

The following table sets forth our consolidated unaudited financial data for the last eight quarters ended December 31, 2017. We believe that we have included all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of our selected quarterly data. The calculation of basic and diluted per share amounts for each quarter is based on the weighted-average shares outstanding for that period; consequently, the sum of the quarters may not necessarily be equal to the full year basic and diluted net income per share.



	For the Quarter Ended
	Dec. 31, 2017 (c)			Sept. 30, 2017		June 30, 2017 (a)		Mar. 31, 2017			Dec. 31, 2016		Sept. 30, 2016		June 30, 2016		Mar. 31, 2016
	(In thousands, except per share data)
Net sales	$	1,148,423		$	1,135,027	$	989,447	$	913,600		$	1,021,613	$	1,086,014	$	917,326	$	868,682
Gross profit	225,494			216,638		172,235		142,906			227,187		213,800		131,606		122,884
Operating income (b)	110,128			98,237		168,293		24,655			126,689		114,615		30,542		22,094
Income tax (benefit) expense	(12,782		)	18,752		32,573		439			18,534		24,086		3,360		1,873
Net income (loss)	101,943			55,630		116,459		(9,144		)	101,202		61,141		5,366		(405		)
Net income (loss) attributable to Amkor	100,770			54,435		115,507		(10,006		)	100,263		60,089		4,713		(875		)
Net income (loss) attributable to Amkor per common share:
Basic	$	0.42		$	0.23	$	0.48	$	(0.04	)	$	0.42	$	0.25	$	0.02	$	—
Diluted	$	0.42		$	0.23	$	0.48	$	(0.04	)	$	0.42	$	0.25	$	0.02	$	—


(a)	In May 2017, we completed the purchase of Nanium. Nanium's financial results have been included in our Consolidated Financial Statements from the date of acquisition.


(b)	In May 2017, we sold the land and buildings comprising our K1 factory for $142.4 million which resulted in a pre-tax gain of $108.1 million.


(c)	In the fourth quarter of 2017, net income includes an estimated net tax benefit of $41.6 million primarily due to the reversal of a valuation allowance on certain U.S. deferred tax assets as a result of the enactment of the Tax Act.