David Philip Henry - 18 Apr 2022 Form 4 Insider Report for MKS INSTRUMENTS INC (MKSI)

Role: SVP, Corp Mkt, PMO & Glob Svc
Signature: /s/ James Kruger, attorney-in-fact
Issuer symbol: MKSI
Transactions as of: 18 Apr 2022
Net transactions value: -$18,628
Form type: 4
Filing time: 19 Apr 2022, 15:37:36 UTC
Previous filing: 16 Feb 2022
Next filing: 02 May 2022
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MKSI	Common Stock	Options Exercise		+479	+12%		4,498	18 Apr 2022	Direct	F1
transaction	MKSI	Common Stock	Tax liability	$18,628	-162	-3.6%	$114.99	4,336	18 Apr 2022	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MKSI	Restricted Stock Unit	Options Exercise		-479	-9.3%		4,657	18 Apr 2022	Common Stock	479		Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit (RSU) 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 vest in two equal annual installments commencing on April 15, 2021, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.