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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, Treasurer	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	Disposition	2015-02-23	2,115	$35.30	20,164	No	4	S	Direct
Common Stock	Acquisiton	2015-02-23	3,115	$0.00	23,279	No	4	M	Direct
Common Stock	Acquisiton	2015-02-23	2,119	$0.00	25,398	No	4	M	Direct
Common Stock	Disposition	2015-02-23	1,702	$35.60	23,696	No	4	F	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Unit	Disposition	2015-02-23	3,115	$0.00	3,115	$0.00
Common Stock	Restricted Stock Unit	Disposition	2015-02-23	2,119	$0.00	2,119	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
42,167			No	4	M	Direct
27,387			No	4	M	Direct

Footnotes

This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person.
This transaction was executed in multiple trades at prices ranging from $35.04 to $35.65. 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.
Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.
These RSUs are subject to the achievement of performance criteria determined in the first year of grant and thereafter vest in three equal annual installments commencing on the first anniversary of the grant date, with the exception of RSUs granted on or after February 15, 2015, in which case, the annual vesting date shall be (i) February 15th or (ii) the next business day if February 15th is not a business day.
These RSUs vest in three equal annual installments commencing on the first anniversary of the grant date, with the exception of RSUs granted on or after February 15, 2015, in which case, the annual vesting date shall be (i) February 15th or (ii) the next business day if February 15th is not a business day.