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MKS INC Director's Dealing 2026

Feb 23, 2026

30723_dirs_2026-02-23_f0e4f89e-3f0a-430a-b35a-a6ab05bcf40a.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

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

Reporting Person: McCarthy Michelle M (VP & Chief Accounting Officer)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2026-02-20 Common Stock S 650 $249.5674 Disposed 816 Direct
2026-02-20 Common Stock S 816 $250.3479 Disposed 0 Direct

Footnotes

F1: This transaction was executed in multiple trades at prices ranging from $249.070 to $250.030. 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.

F2: This transaction was executed in multiple trades at prices ranging from $250.160 to $250.790. 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.