MKS INC — Director's Dealing 2014

Apr 3, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2014-04-02

Reporting Person: Quirk Brian Charles (Sr. VP, Global Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-04-02	Common Stock	M	2469	—	Acquired	5621.635	Direct
2014-04-02	Common Stock	F	804	$30.70	Disposed	4817.635	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-04-02	Restricted Stock Unit	$	M	2469	Disposed		Common Stock (2469)	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 equal annual installments over three years from the respective original grant date.