MKS INC — Director's Dealing 2015

Feb 11, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2015-02-10

Reporting Person: COLELLA GERARD G (Director, CEO, President, Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-02-10	Common Stock	M	12051.395	—	Acquired	23642.659	Direct
2015-02-10	Common Stock	M	8034	—	Acquired	31676.659	Direct
2015-02-10	Common Stock	F	6594	$35.86	Disposed	25082.659	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-02-10	Restricted Stock Unit	$	M	12051.395	Disposed		Common Stock (12051.395)	Direct
2015-02-10	Restricted Stock Unit	$	M	8034	Disposed		Common Stock (8034)	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: These RSUs are subject to the achievement of performance criteria determined in the first year of the grant and thereafter vests in equal annual installments over three years.

F4: The RSUs vest in equal annual installments over three years.