16 insiders reported 166 Form 4 transactions for MKS INSTRUMENTS INC (MKSI) over the past 18 months (most recent 2026-06-16). Recent activity: Schreiner James Alan (EVP & COO) Sell 2,471 shares, Schreiner James Alan (EVP & COO) Sell 812 shares, Schreiner James Alan (EVP & COO) Sell 217 shares, Schreiner James Alan (EVP & COO) Sell 781 shares, McCarthy Michelle M (SVP & Chief Accounting Officer) Sell 2,434 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-16 | Schreiner James Alan | EVP & COO | Sell | 2,471 | $853,790 |
| 2026-06-16 | Schreiner James Alan | EVP & COO | Sell | 812 | $281,282 |
| 2026-06-16 | Schreiner James Alan | EVP & COO | Sell | 217 | $75,299 |
| 2026-06-11 | Schreiner James Alan | EVP & COO | Sell | 781 | $247,905 |
| 2026-06-08 | McCarthy Michelle M | SVP & Chief Accounting Officer | Sell | 2,434 | $767,270 |
| 2026-06-02 | Henry David Philip | EVP, Global Str Mktg & GM, MSD | Sell | 6,000 | $1.9M |
| 2026-06-02 | Mora Elizabeth | Director | Sell | 300 | $95,406 |
| 2026-05-19 | CANNONE PETER III | Director | Sell | 1,350 | $409,590 |
| 2026-05-15 | Moloney Jacqueline F | Director | Sell | 1,000 | $312,197 |
| 2026-05-14 | Moloney Jacqueline F | Director | Sell | 1,400 | $446,586 |
| 2026-05-12 | COLELLA GERALD G | Director | Buy | 782 | $0 |
| 2026-05-12 | CANNONE PETER III | Director | Buy | 782 | $0 |
| 2026-05-12 | Donahue Joseph B | Director | Buy | 782 | $0 |
| 2026-05-12 | Moloney Jacqueline F | Director | Buy | 782 | $0 |
| 2026-05-12 | Mora Elizabeth | Director | Buy | 782 | $0 |
| 2026-05-12 | Batra Raj | Director | Buy | 782 | $0 |
| 2026-05-12 | Burke Kathleen Flaherty | EVP, GC & Secretary | Sell | 4,355 | $1.4M |
| 2026-05-12 | Taranto Eric Robert | EVP & GM, VSD | Sell | 2,849 | $911,328 |
| 2026-05-12 | JABRE WISSAM G | Director | Buy | 782 | $0 |
| 2026-04-20 | Williams John Edward | EVP & GM, PSD | Buy | 1,741 | $0 |
| 2026-04-20 | Williams John Edward | EVP & GM, PSD | Sell | 826 | $222,921 |
| 2026-04-16 | McCarthy Michelle M | SVP & Chief Accounting Officer | Buy | 968 | $0 |
| 2026-04-16 | McCarthy Michelle M | SVP & Chief Accounting Officer | Buy | 1,107 | $0 |
| 2026-04-16 | McCarthy Michelle M | SVP & Chief Accounting Officer | Buy | 1,736 | $0 |
| 2026-04-16 | McCarthy Michelle M | SVP & Chief Accounting Officer | Sell | 1,375 | $377,080 |
Source: SEC Form 4 filings · as of 2026-06-16