MKS INC — Director's Dealing 2019

May 9, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2019-05-08

Reporting Person: Moloney Jacqueline F (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-05-08	Common Stock	A	1980.429	—	Acquired	8550.825	Direct
2019-05-08	Common Stock	S	256	$85.861	Disposed	8294.825	Direct

Footnotes

F1: These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

F2: Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc.