MKS INC — Director's Dealing 2017

Apr 3, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2017-03-31

Reporting Person: Werth Dennis L (Sr. VP, Business Units)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-03-31	Common Stock	M	2952	—	Acquired	7557	Direct
2017-03-31	Common Stock	M	2455	—	Acquired	10012	Direct
2017-03-31	Common Stock	F	2033	$68.75	Disposed	7979	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-03-31	Restricted Stock Unit	$	M	2952	Disposed		Common Stock (2952)	Direct
2017-03-31	Restricted Stock Unit	$	M	2455	Disposed		Common Stock (2455)	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 vested on March 31, 2017.