MKS INC — Director's Dealing 2020

May 20, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2020-05-19

Reporting Person: COLELLA GERARD G (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-05-19	Common Stock	S	5000	$100.1715	Disposed	44786	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1990.586	Direct
Common Stock	40800	Indirect

Footnotes

F1: This transaction was executed in multiple trades at prices ranging from $100.07 to $100.55. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.