CANNONE PETER III 4

What Happened Peter Cannone III, a director of MKS Inc (MKSI), received an award of 781.959 restricted stock units (RSUs) on May 11, 2026. No purchase price or immediate share transfer is reported (price listed as N/A); the RSUs represent a contingent right to receive common shares upon vesting, so they do not constitute an immediate open-market purchase or sale.

Key Details

• Transaction date: May 11, 2026; Form 4 filed May 12, 2026 (timely disclosure).
• Award amount: 781.959 restricted stock units; price: N/A (grant).
• Shares owned after transaction: not reported in this filing.
• Vesting note (from footnotes): RSUs fully vest on the day before the first annual shareholder meeting after the grant, or on the 13‑month anniversary if no meeting occurs within 13 months.
• Each RSU equals the contingent right to one share of MKS common stock (1:1 conversion upon vesting).

Context Restricted stock units are a form of equity compensation that convert to shares only when they vest; they are not an immediate purchase and do not by themselves signal insider buying or selling. For retail investors, cash purchases by insiders are generally considered a clearer bullish signal than grants, which are typically part of standard compensation.