MKS INC·4

Feb 9, 2:00 PM ET

Williams John Edward 4

4 · MKS INC · Filed Feb 9, 2026

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MKS INC (MKSI) EVP John Williams Receives RSU Award

What Happened John Edward Williams, EVP & GM, PSD at MKS Inc (MKSI), was granted 2,973.357 restricted stock units (RSUs) on February 8, 2026. These RSUs are performance-based awards (reported as a derivative grant) and do not show a purchase price; they represent the contingent right to receive up to 2,973.357 shares of MKS common stock if performance conditions are met.

Key Details

  • Transaction type: Award/Grant of RSUs (code A) on 2026-02-08.
  • Amount: 2,973.357 RSUs. No per-share price or immediate cash value reported (N/A).
  • Vesting: Performance achievement was determined Feb 8, 2026; awards vest in three equal annual installments beginning Feb 15, 2026 (or the next business day if Feb 15 is not a business day).
  • RSU meaning: Each RSU equals the contingent right to one share of MKS common stock (footnote).
  • Shares owned after transaction: Not disclosed in this Form 4.
  • Filing timeliness: Filed Feb 9, 2026 for a transaction on Feb 8, 2026 (filed within the standard reporting window).

Context These are restricted stock units tied to performance criteria — not an open-market buy or sale — so they indicate compensation rather than a direct bullish or bearish trade by the insider. The eventual value and share delivery depend on meeting the stated performance conditions and the company’s stock price at settlement/vesting.

Insider Transaction Report

Form 4
Period: 2026-02-08
Transactions
  • Award

    Restricted Stock Unit

    [F1][F2]
    2026-02-08+2,973.35710,317.107 total
    Common Stock (2,973.357 underlying)
Footnotes (2)
  • [F1]Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.
  • [F2]These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2026, and thereafter vest in three equal annual installments beginning on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.
Signature
/s/ M. Kathryn Rickards, attorney-in-fact|2026-02-09

Documents

1 file
  • 4
    form4.xmlPrimary

    PRIMARY DOCUMENT