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: BAGSHAW SETH H (EVP, CFO & Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-12-01	Common Stock	M	349	—	Acquired	21021.668	Direct
2023-12-01	Common Stock	M	350	—	Acquired	21371.668	Direct
2023-12-01	Common Stock	F	699	$84.19	Disposed	20672.668	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-12-01	Restricted Stock Unit	$	M	349	Disposed		Common Stock (349)	Direct
2023-12-01	Restricted Stock Unit	$	M	350	Disposed		Common Stock (350)	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 2022 RSU Award accelerated to satisfy FICA taxes.

F4: Portion of 2023 RSU Award accelerated to satisfy FICA taxes.