MKS Instruments (MKSI) — insider trading
Information Technology · NASDAQ
MKS Instruments (MKSI) has 45 reported SEC Form 4 insider transactions in our data, including 26 open-market sales among the most recent 45 (latest 2026-09-01).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-01 | Mora Elizabeth | Director | Open-market sale | 300 | $250.96 | $75.3K | Form 4 |
| 2026-08-17 | Donlan Renee Martel | Officer (EVP, GC & CCO) | Grant / award / vesting (derivative) | 954 | — | — | Form 4 |
| 2026-08-14 | Lee John Tseng-Chung | Director, Officer (President & CEO) | Open-market sale | 10,000 | $302.01 | $3.02M | Form 4 |
| 2026-08-03 | Williams John Edward | Officer (EVP & GM, PSD) | Open-market sale | 457 | $288.31 | $131.8K | Form 4 |
| 2026-06-12 | Schreiner James Alan | Officer (EVP & COO) | Open-market sale | 217 | $347.00 | $75.3K | Form 4 |
| 2026-06-12 | Schreiner James Alan | Officer (EVP & COO) | Open-market sale | 812 | $346.41 | $281.3K | Form 4 |
| 2026-06-12 | Schreiner James Alan | Officer (EVP & COO) | Open-market sale | 2,471 | $345.52 | $853.8K | Form 4 |
| 2026-06-10 | Schreiner James Alan | Officer (EVP & COO) | Open-market sale | 781 | $317.42 | $247.9K | Form 4 |
| 2026-06-05 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Open-market sale | 2,434 | $315.23 | $767.3K | Form 4 |
| 2026-06-01 | Mora Elizabeth | Director | Open-market sale | 300 | $318.02 | $95.4K | Form 4 |
| 2026-06-01 | Henry David Philip | Officer (EVP, Global Str Mktg & GM, MSD) | Open-market sale | 6,000 | $314.43 | $1.89M | Form 4 |
| 2026-05-27 | COLELLA GERALD G | Director | Open-market sale | 2,800 | $338.58 | $948.0K | Form 4 |
| 2026-05-27 | COLELLA GERALD G | Director | Open-market sale | 213 | $337.05 | $71.8K | Form 4 |
| 2026-05-27 | COLELLA GERALD G | Director | Open-market sale | 1,626 | $336.54 | $547.2K | Form 4 |
| 2026-05-27 | COLELLA GERALD G | Director | Open-market sale | 1,811 | $335.46 | $607.5K | Form 4 |
| 2026-05-27 | COLELLA GERALD G | Director | Open-market sale | 4,876 | $332.04 | $1.62M | Form 4 |
| 2026-05-27 | COLELLA GERALD G | Director | Open-market sale | 8,210 | $331.45 | $2.72M | Form 4 |
| 2026-05-27 | COLELLA GERALD G | Director | Open-market sale | 464 | $330.38 | $153.3K | Form 4 |
| 2026-05-27 | Donahue Joseph B | Director | Open-market sale | 2,100 | $327.95 | $688.7K | Form 4 |
| 2026-05-26 | Henry David Philip | Officer (EVP, Global Str Mktg & GM, MSD) | Open-market sale | 2,500 | $330.50 | $826.3K | Form 4 |
| 2026-05-22 | Lee John Tseng-Chung | Director, Officer (President & CEO) | Open-market sale | 10,000 | $315.48 | $3.15M | Form 4 |
| 2026-05-22 | Mayampurath Ramakumar | Officer (EVP & CFO) | Open-market sale | 8,810 | $315.48 | $2.78M | Form 4 |
| 2026-05-18 | CANNONE PETER III | Director | Open-market sale | 1,350 | $303.40 | $409.6K | Form 4 |
| 2026-05-14 | Moloney Jacqueline F | Director | Open-market sale | 1,000 | $312.20 | $312.2K | Form 4 |
| 2026-05-13 | Moloney Jacqueline F | Director | Open-market sale | 1,400 | $318.99 | $446.6K | Form 4 |
| 2026-05-11 | COLELLA GERALD G | Director | Grant / award / vesting | 782 | — | — | Form 4 |
| 2026-05-11 | Batra Raj | Director | Grant / award / vesting | 782 | — | — | Form 4 |
| 2026-05-11 | CANNONE PETER III | Director | Grant / award / vesting | 782 | — | — | Form 4 |
| 2026-05-11 | Donahue Joseph B | Director | Grant / award / vesting | 782 | — | — | Form 4 |
| 2026-05-11 | Burke Kathleen Flaherty | Officer (EVP, GC & Secretary) | Open-market sale | 4,355 | $319.94 | $1.39M | Form 4 |
| 2026-05-11 | Mora Elizabeth | Director | Grant / award / vesting | 782 | — | — | Form 4 |
| 2026-05-11 | JABRE WISSAM G | Director | Grant / award / vesting | 782 | — | — | Form 4 |
| 2026-05-11 | Moloney Jacqueline F | Director | Grant / award / vesting | 782 | — | — | Form 4 |
| 2026-05-11 | Taranto Eric Robert | Officer (EVP & GM, VSD) | Open-market sale | 2,849 | $319.93 | $911.3K | Form 4 |
| 2026-04-17 | Williams John Edward | Officer (EVP & GM, PSD) | Option exercise / conversion (derivative) | 1,741 | — | — | Form 4 |
| 2026-04-17 | Williams John Edward | Officer (EVP & GM, PSD) | Shares withheld for taxes / exercise cost | 826 | $269.89 | $222.9K | Form 4 |
| 2026-04-17 | Williams John Edward | Officer (EVP & GM, PSD) | Option exercise / conversion | 1,741 | — | — | Form 4 |
| 2026-04-15 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Option exercise / conversion (derivative) | 1,736 | — | — | Form 4 |
| 2026-04-15 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Option exercise / conversion (derivative) | 1,107 | — | — | Form 4 |
| 2026-04-15 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Option exercise / conversion (derivative) | 968 | — | — | Form 4 |
| 2026-04-15 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Grant / award / vesting (derivative) | 1,673 | — | — | Form 4 |
| 2026-04-15 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Shares withheld for taxes / exercise cost | 1,375 | $274.15 | $377.1K | Form 4 |
| 2026-04-15 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Option exercise / conversion | 1,736 | — | — | Form 4 |
| 2026-04-15 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Option exercise / conversion | 1,107 | — | — | Form 4 |
| 2026-04-15 | McCarthy Michelle M | Officer (SVP & Chief Accounting Officer) | Option exercise / conversion | 968 | — | — | Form 4 |
Ask the chat about MKSI's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: MKS Instruments (MKSI).
Last updated 2026-09-01 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.