Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2014

MKS INSTRUMENTS, INC.

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS


			Additions
Description	Balance at Beginning of Year		Charged to Costs and Expenses			Charged to Other Accounts			Deductions & Write-offs			Balance at End of Year
	(in thousands)
Allowance for doubtful acounts:
Years ended December 31,
2014	$	1,924	$	668		$	12		$	(354	)	$	2,250
2013	$	2,078	$	631		$	(62	)	$	(723	)	$	1,924
2012	$	1,349	$	888		$	—		$	(159	)	$	2,078

			Additions
Description	Balance at Beginning of Year		Charged to Costs and Expenses			Charged to Other Accounts			Deductions & Write-offs			Balance at End of Year
	(in thousands)
Allowance for sales returns:
Years ended December 31,
2014	$	827	$	2,223		$	—		$	(2,320	)	$	730
2013	$	801	$	1,933		$	(36	)	$	(1,871	)	$	827
2012	$	1,167	$	2,564		$	—		$	(2,930	)	$	801

			Additions
Description	Balance at Beginning of Year		Charged to Costs and Expenses			Charged to Other Accounts			Deductions			Balance at End of Year
	(in thousands)
Valuation allowance on deferred tax asset:
Years ended December 31,
2014	$	27,102	$	—		$	—		$	(339	)	$	26,763
2013	$	27,497	$	—		$	—		$	(395	)	$	27,102
2012	$	26,475	$	(44	)	$	1,066			—		$	27,497