Stock Trading History of Kahl Hans Jochen

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Kahl Hans Jochen since year 2005. The trader's CIK number is 1202779. At the time of this reporting, Kahl Hans Jochen is the Director of Mks Instruments Inc . (stock ticker symbol MKSI). See this page for all insider trading activities at Mks Instruments Inc .

Stock purchases, sales, and option exercises reported by insider *Kahl Hans Jochen* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-05-13	MKSI	Mks Instruments Inc	Sale	2,987	24.77	73,987
2008-05-08	MKSI	Mks Instruments Inc	Sale	4,000	23.85	95,400
2008-05-04	MKSI	Mks Instruments Inc	Option Exercise	4,000	.00	0
2007-05-14	MKSI	Mks Instruments Inc	Option Exercise	12,000	24.35	292,200
2007-05-14	MKSI	Mks Instruments Inc	Sale	12,000	27.16	325,980
2007-02-22	MKSI	Mks Instruments Inc	Sale	12,000	24.84	298,050
2007-02-22	MKSI	Mks Instruments Inc	Option Exercise	12,000	20.07	240,840
2006-05-08	MKSI	Mks Instruments Inc	Sale	13,876	24.31	337,325
2006-05-08	MKSI	Mks Instruments Inc	Option Exercise	13,876	17.98	249,559
2006-02-21	MKSI	Mks Instruments Inc	Sale	4,687	23.06	108,082

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Kahl Hans Jochen (Director of Mks Instruments Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.