Mark Milton Gitin - 15 Feb 2024 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: 15 Feb 2024
Net transactions value: -$311,727
Form type: 4
Filing time: 16 Feb 2024, 15:10:39 UTC
Previous filing: 06 Feb 2024
Next filing: 07 Jun 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		+1,104	+9.3%		12,949	15 Feb 2024	Direct	F1
transaction	MKSI	Common Stock	Options Exercise		+552	+4.3%		13,501	15 Feb 2024	Direct	F1
transaction	MKSI	Common Stock	Options Exercise		+1,260	+9.3%		14,761	15 Feb 2024	Direct	F1
transaction	MKSI	Common Stock	Options Exercise		+907	+6.1%		15,668	15 Feb 2024	Direct	F1
transaction	MKSI	Common Stock	Options Exercise		+1,988	+13%		17,656	15 Feb 2024	Direct	F1
transaction	MKSI	Common Stock	Options Exercise		+1,030	+5.8%		18,686	15 Feb 2024	Direct	F1
transaction	MKSI	Common Stock	Tax liability	$311,727	-2,552	-14%	$122.15	16,134	15 Feb 2024	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		+2,907	+19%		17,954	15 Feb 2024	Common Stock	2,907		Direct	F1, F3
transaction	MKSI	Restricted Stock Unit	Options Exercise		-1,104	-6.1%		16,850	15 Feb 2024	Common Stock	1,104		Direct	F1, F4
transaction	MKSI	Restricted Stock Unit	Options Exercise		-552	-3.3%		16,298	15 Feb 2024	Common Stock	552		Direct	F1, F5
transaction	MKSI	Restricted Stock Unit	Options Exercise		-1,260	-7.7%		15,038	15 Feb 2024	Common Stock	1,260		Direct	F1, F6
transaction	MKSI	Restricted Stock Unit	Options Exercise		-907	-6%		14,131	15 Feb 2024	Common Stock	907		Direct	F1, F7
transaction	MKSI	Restricted Stock Unit	Options Exercise		-1,988	-14%		12,143	15 Feb 2024	Common Stock	1,988		Direct	F1, F8
transaction	MKSI	Restricted Stock Unit	Options Exercise		-1,030	-8.5%		11,113	15 Feb 2024	Common Stock	1,030		Direct	F1, F9

* 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 February 15, 2025, 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.
F8	These RSUs were subject to performance criteria, the achievement of which was determined on February 5, 2024, and thereafter vest in three equal annual installments beginning 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.
F9	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.