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MKS INC Director's Dealing 2025

Apr 18, 2025

30723_dirs_2025-04-18_5e6062a6-5b1e-43e3-8ecc-53948dcef52c.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MKS INSTRUMENTS INC (MKSI)
CIK: 0001049502
Period of Report: 2025-04-17

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

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2025-04-17 Common Stock M 1740 Acquired 3565.814 Direct
2025-04-17 Common Stock F 565 $63.69 Disposed 3000.814 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2025-04-17 Restricted Stock Unit $ M 1740 Disposed Common Stock (1740) Direct

Footnotes

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

F2: These shares were withheld by MKS Instruments, 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 equal annual installments commencing on April 17, 2025, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.