Mark Milton Gitin - 17 Apr 2023 Form 4 Insider Report for MKS INSTRUMENTS INC (MKSI)

Role: EVP & GM, PSD
Signature: /s/ M. Kathryn Rickards, attorney-in-fact
Issuer symbol: MKSI
Transactions as of: 17 Apr 2023
Net transactions value: -$51,240
Form type: 4
Filing time: 19 Apr 2023, 11:41:05 UTC
Previous filing: 16 Feb 2023
Next filing: 06 Feb 2024
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		+1,797	+17%		12,190	17 Apr 2023	Direct	F1
transaction	MKSI	Common Stock	Tax liability	$51,240	-622	-5.1%	$82.38	11,568	17 Apr 2023	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		-1,797	-17%		9,081	17 Apr 2023	Common Stock	1,797		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	These shares were withheld by MKS Instruments, Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.
F3	These RSUs vest in three equal annual installments commencing on April 17, 2021, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.