James Alan Schreiner - Aug 19, 2024 Form 4 Insider Report for MKS INSTRUMENTS INC (MKSI)

Role: EVP & COO, MSD
Signature: /s/ Kathleen F. Burke, attorney-in-fact
Stock symbol: MKSI
Transactions as of: Aug 19, 2024
Transactions value $: -$223,056
Form type: 4
Date filed: 8/20/2024, 01:45 PM
Previous filing: May 16, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MKSI	Common Stock	Options Exercise		+3.96K	+23.84%		20.6K	Aug 19, 2024	Direct	F1
transaction	MKSI	Common Stock	Tax liability	-$223K	-1.87K	-9.1%	$119.09	18.7K	Aug 19, 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	Options Exercise		-3.96K	-19.02%		16.9K	Aug 19, 2024	Common Stock	3.96K		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 shall vest in two installments, 60% of which shall vest on August 17, 2024 and 40% of which shall vest on August 17, 2025; provided that if, in any vesting year, August 17th is not a business day, such vesting shall occur on the next business day.