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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
1192439	H Seth Bagshaw	C/O Mks 2 Tech Drive, Suite 201 Andover MA 01810	Vice President, Cfo	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2011-03-28	4,200	$32.32	4,200	No	4	M	Direct
Common Stock	Disposition	2011-03-28	1,334	$32.32	2,866	No	4	F	Direct
Common Stock	Disposition	2011-03-28	2,866	$31.74	0	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	F	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Unit	Disposition	2011-03-28	4,200	$0.00	4,200	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
16,062			No	4	M	Direct

Footnotes

Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.
The RSUs vest in equal annual installments over three years
This transaction was executed in multiple trades at prices ranging from $31.56 to $31.96 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.