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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
1202738	Leo Berlinghieri	2 Tech Drive Andover MA 01810	President And Ceo	Yes	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	2010-04-26	880	$20.02	35,893	No	4	M	Direct
Common Stock	Acquisiton	2010-04-26	466	$18.44	36,359	No	4	M	Direct
Common Stock	Acquisiton	2010-04-26	14,700	$16.88	51,059	No	4	M	Direct
Common Stock	Acquisiton	2010-04-26	482	$12.97	51,541	No	4	M	Direct
Common Stock	Acquisiton	2010-04-26	375	$17.60	51,916	No	4	M	Direct
Common Stock	Acquisiton	2010-04-26	30,000	$17.25	81,916	No	4	M	Direct
Common Stock	Disposition	2010-04-26	45,800	$23.50	36,116	No	4	S	Direct
Common Stock	Acquisiton	2010-04-27	500	$16.88	36,616	No	4	M	Direct
Common Stock	Acquisiton	2010-04-27	200	$17.60	36,816	No	4	M	Direct
Common Stock	Disposition	2010-04-27	700	$24.00	36,116	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-26	880	$0.00	880	$20.02
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-26	466	$0.00	466	$18.44
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-26	14,700	$0.00	14,700	$16.88
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-26	482	$0.00	482	$12.97
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-26	375	$0.00	375	$17.60
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-26	30,000	$0.00	30,000	$17.25
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-27	500	$0.00	500	$16.88
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-27	200	$0.00	200	$17.60

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2002-10-15	2011-10-15	No	4	M	Direct
0	2003-06-24	2012-06-24	No	4	M	Direct
15,300	2003-11-22	2012-11-22	No	4	M	Direct
0	2004-02-07	2013-02-07	No	4	M	Direct
0	2004-07-01	2013-07-01	No	4	M	Direct
0	2002-03-21	2011-03-21	No	4	M	Direct
14,800	2003-11-22	2012-11-22	No	4	M	Direct
49,800	2004-07-01	2013-07-01	No	4	M	Direct

Footnotes

This transaction was executed in multiple trades at prices ranging from $23.75 to 24.42. 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.
Vests as follows: 33 1/3 after the first year and each successive 12 month period thereafter.
Vests 100% one year after grant
25% after first year, 6.25% each quarter thereafter - total 4 years.