1) Q4 2017 net income includes an estimated one-time net tax benefit of $42 million, or $0.17 per diluted share, primarily due to the reversal of a valuation allowance on certain U.S. deferred tax assets related to U.S. tax reform.
2) EBITDA is a non-GAAP measure. The reconciliation to the comparable GAAP measure is included below under "Selected Operating Data."

"Operating margin, net income and EBITDA all showed solid gains year-on-year," said Megan Faust, Amkor’s corporate vice president and chief financial officer. "Profitability improved due to healthy sales growth, despite an unfavorable foreign currency impact of 120 bps on gross margin compared to Q1 2017."

Cash and cash equivalents were $495 million and total debt was $1.3 billion, at March 31, 2018.

New Accounting Standards

Effective January 1, 2018, we adopted Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606), utilizing the full retrospective transition method. The prior periods presented here have been revised to reflect this change.

Business Outlook

"We expect second quarter 2018 revenues to be around $1.03 billion, up 2% year-on-year," said Kelley. "The smartphone market is expected to remain somewhat muted in Q2, while demand in our other end markets is solid."

Second quarter 2018 outlook (unless otherwise noted):

• Net sales of $990 million to $1.07 billion
• Gross margin of 14% to 16%
• Net loss of $4 million to net income of $24 million, or ($0.02) to $0.10 per diluted share
• Full year capital expenditures of approximately $600 million

Conference Call Information

Amkor will conduct a conference call on Thursday, April 26, 2018, at 5:00 p.m. Eastern Time. This call may include material information not included in this press release. This call is being webcast and can be accessed at Amkor's website: www.amkor.com. You may also access the call by dialing 1-877-645-6380 or 1-404-991-3911. A replay of the call will be made available at Amkor's website or by dialing 1-855-859-2056 or 1-404-537-3406 (conference ID 2471407). The webcast is also being distributed over NASDAQ OMX's investor distribution network to both institutional and individual investors. Institutional investors can access the call via NASDAQ OMX's password-protected event management site, Street Events ( www.streetevents.com).

About Amkor Technology, Inc.

Amkor Technology, Inc. is one of the world’s largest providers of outsourced semiconductor packaging and test services. Founded in 1968, Amkor pioneered the outsourcing of IC packaging and test, and is now a strategic manufacturing partner for more than 250 of the world’s leading semiconductor companies, foundries and electronics OEMs. Amkor’s operational base includes production facilities, product development centers, and sales and support offices located in key electronics manufacturing regions in Asia, Europe and the USA. For more information, visit www.amkor.com.

AMKOR TECHNOLOGY, INC. Selected Operating Data
			Q1 2018				Q4 2017				Q1 2017
Net Sales Data:
Net sales (in millions):
Advanced products*			$	476			$	582			$	376
Mainstream products**			549				568				523
Total net sales			$	1,025			$	1,150			$	899
Packaging services			81		%		82		%		82		%
Test services			19		%		18		%		18		%
Net sales from top ten customers			69		%		67		%		66		%
End Market Data:
Communications (smartphones, tablets, handheld devices)			42		%		48		%		37		%
Automotive, industrial and other (driver assist, infotainment, safety, performance)			26		%		23		%		29		%
Computing (datacenter, infrastructure, PC/laptop, storage)			19		%		17		%		20		%
Consumer (set-top boxes, televisions, connected home, personal electronics, visual imaging)			13		%		12		%		14		%
Total			100		%		100		%		100		%
Gross Margin Data:
Net sales			100.0		%		100.0		%		100.0		%
Cost of sales:
Materials			36.9		%		37.5		%		35.6		%
Labor			17.5		%		14.6		%		16.6		%
Other manufacturing			30.2		%		28.4		%		32.7		%
Gross margin			15.4		%		19.5		%		15.1		%

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