Eric Robert Taranto - Feb 15, 2023 Form 4 Insider Report for MKS INSTRUMENTS INC (MKSI)

Role: EVP & GM, VSD
Signature: /s/ M. Kathryn Rickards, attorney-in-fact
Stock symbol: MKSI
Transactions as of: Feb 15, 2023
Transactions value $: -$90,863
Form type: 4
Date filed: 2/16/2023, 02:13 PM
Previous filing: Feb 9, 2023
Next filing: Apr 19, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MKSI	Common Stock	Options Exercise		+774	+13.17%		6.65K	Feb 15, 2023	Direct	F1
transaction	MKSI	Common Stock	Options Exercise		+387	+5.82%		7.04K	Feb 15, 2023	Direct	F1
transaction	MKSI	Common Stock	Options Exercise		+1.12K	+15.88%		8.15K	Feb 15, 2023	Direct	F1
transaction	MKSI	Common Stock	Options Exercise		+804	+9.86%		8.96K	Feb 15, 2023	Direct	F1
transaction	MKSI	Common Stock	Tax liability	-$90.9K	-906	-10.12%	$100.29	8.05K	Feb 15, 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	Award		+2.74K	+30.39%		11.8K	Feb 15, 2023	Common Stock	2.74K		Direct	F1, F3
transaction	MKSI	Restricted Stock Unit	Options Exercise		-774	-6.58%		11K	Feb 15, 2023	Common Stock	774		Direct	F1, F4
transaction	MKSI	Restricted Stock Unit	Options Exercise		-387	-3.52%		10.6K	Feb 15, 2023	Common Stock	387		Direct	F1, F5
transaction	MKSI	Restricted Stock Unit	Options Exercise		-1.12K	-10.53%		9.49K	Feb 15, 2023	Common Stock	1.12K		Direct	F1, F6
transaction	MKSI	Restricted Stock Unit	Options Exercise		-804	-8.47%		8.68K	Feb 15, 2023	Common Stock	804		Direct	F1, F7

* 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 three equal annual installments commencing on February 15, 2024, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.
F4	These RSUs were subject to performance criteria, the achievement of which was determined on January 21, 2022, and thereafter vest in three equal annual installments beginning on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.
F5	These RSUs vest in three equal annual installments commencing on February 15, 2022, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.
F6	These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2023, and thereafter vest in three equal annual installments beginning on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.
F7	These RSUs vest in three equal annual installments commencing on February 15, 2023, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.