MKS INC — Director's Dealing 2013

Apr 11, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2013-04-09

Reporting Person: Eyerman Paul (VP & GM, ENI and Medical)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-04-09	Common Stock	M	5000	—	Acquired	17142.875	Direct
2013-04-09	Common Stock	F	1849	$26.06	Disposed	15293.875	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-04-09	Restricted Stock Unit	$	M	5000	Disposed		Common Stock (5000)	Direct

Footnotes

F1: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F2: This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person.

F3: The RSUs vest in 3 years after grant date.