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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1049502	Mks Instruments Inc	MKSI	Industrial Instruments For Measurement, Display, And Control (3823)	042277512

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1202741	S Richard Chute	2 Tech Drive Andover MA 01810		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-05-02	6,000	$0.00	13,000	No	4	A	Direct
Common Stock	Disposition	2011-05-02	6,000	$28.32	7,000	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	A	Direct
No	4	S	Direct

Footnotes

This RSU grant fully vests on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).
Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.
This transaction was executed in multiple trades at prices ranging from $28.119 to $28.43 The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.