MKS INC — Director's Dealing 2012

Nov 28, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2012-11-26

Reporting Person: CHUTE RICHARD S (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-11-26	Common Stock	M	12000	$17.06	Acquired	19000	Direct
2012-11-26	Common Stock	S	12000	$24.092	Disposed	7000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-11-26	Stock Option (Right to Buy)	$17.06	M	12000	Disposed	2013-05-14	Common Stock (12000)	Direct

Footnotes

F1: This transaction was executed in multiple trades at prices ranging from $24.00 to $24.27 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.