MKS INC — Director's Dealing 2026

Feb 23, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INC (MKSI)
CIK: 0001049502
Period of Report: 2026-02-20

Reporting Person: Williams John Edward (EVP & GM, PSD)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-20	Common Stock	S	2042.625	$256.4075	Disposed	3640.099	Direct

Footnotes

F1: This transaction was executed in multiple trades at prices ranging from $256.3902 to $257.150. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.