MKS INC — Director's Dealing 2023

Dec 5, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2023-12-01

Reporting Person: Lee John Tseng-Chung (Director, President & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-12-01	Common Stock	M	390	—	Acquired	78528.607	Direct
2023-12-01	Common Stock	M	1186	—	Acquired	79714.607	Direct
2023-12-01	Common Stock	M	160	—	Acquired	79874.607	Direct
2023-12-01	Common Stock	M	569	—	Acquired	80443.607	Direct
2023-12-01	Common Stock	M	970	—	Acquired	81413.607	Direct
2023-12-01	Common Stock	F	3275	$84.19	Disposed	78138.607	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-12-01	Restricted Stock Unit	$	M	390	Disposed		Common Stock (390)	Direct
2023-12-01	Restricted Stock Unit	$	M	1186	Disposed		Common Stock (1186)	Direct
2023-12-01	Restricted Stock Unit	$	M	160	Disposed		Common Stock (160)	Direct
2023-12-01	Restricted Stock Unit	$	M	569	Disposed		Common Stock (569)	Direct
2023-12-01	Restricted Stock Unit	$	M	970	Disposed		Common Stock (970)	Direct

Footnotes

F1: Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

F2: Shares used to satisfy FICA taxes.

F3: Portion of 2021 RSU Award accelerated to satisfy FICA taxes.

F4: Portion of 2022 RSU Award accelerated to satisfy FICA taxes.

F5: Portion of 2023 RSU Award accelerated to satisfy FICA taxes.