COLELLA GERALD G 4

What Happened Gerald G. Colella, a director of MKS Inc (MKSI), received a grant of 781.959 restricted stock units (RSUs) on May 11, 2026. The Form 4 lists this as an award/grant (transaction code A); no per-share price or immediate dollar value is reported (listed as N/A). These RSUs are contingent rights to receive one share each upon vesting.

Key Details

• Transaction date: 2026-05-11 (Period of Report); Form 4 filed 2026-05-12 (timely).
• Transaction type: Award/Grant (code A) of 781.959 RSUs; price reported as N/A.
• Shares owned after transaction: Not disclosed in the provided excerpt.
• Footnotes: F1 — RSUs vest the day before the first annual shareholders’ meeting after the grant, or on the 13-month anniversary if no meeting is held within 13 months. F2 — Each RSU equals the contingent right to one share of MKS common stock.
• Filing timeliness: Appears timely (reported day after the grant).

Context RSU grants are a form of compensation for board members and do not represent an open-market purchase or sale. These units only convert to actual shares if and when they vest per the schedule above, so they do not provide immediate liquidity or indicate an immediate buy/sell signal. No tax-withholding or sale-upon-vesting details are disclosed in this filing.