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MKS INC Director's Dealing 2025

Aug 19, 2025

30723_dirs_2025-08-19_f14ddfc4-9528-4100-bda0-46b94f1c60b9.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: 2025-08-18

Reporting Person: Schreiner James Alan (EVP & COO)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2025-08-18 Common Stock M 2640.942 Acquired 25332.694 Direct
2025-08-18 Common Stock F 1249 $100.22 Disposed 24083.694 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2025-08-18 Restricted Stock Unit $ M 2640.942 Disposed Common Stock (2640.942) Direct

Footnotes

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

F2: These shares were withheld by MKS 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 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.