MKS INC — Director's Dealing 2018

Apr 3, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2018-04-02

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-04-02	Common Stock	M	2456	—	Acquired	2456	Direct
2018-04-02	Common Stock	F	1212	$110.70	Disposed	1244	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-04-02	Restricted Stock Unit	$	M	2456	Disposed		Common Stock (2456)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	15944.437	Indirect

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, 2018.