Mks Inc
A maker of the vacuum gauges, lasers, and specialty chemicals that help produce computer chips, circuit boards, and other high-tech goods, MKS supplies the tools factories rely on to build modern electronics. It was founded in 1961 in a Massachusetts garage after Sidney Siegel built a device to measure low-pressure gases, and its name comes from the Meter-Kilogram-Second system of measurement. That first gadget, the Baratron manometer, became essential to making microprocessors — a fitting start for a company still helping power the digital world.
Sold 2.00M
Sold 2.00M
Granted 282.7K · Sold 40.0K
Granted 1.8K
Granted 8.2K · Bought 1.0K · Sold 41.0K
Granted 60.6K · Sold 27.6K
Granted 781.96 · Sold 40.0K
Granted 45.8K · Sold 10.9K
Granted 9.0K · Sold 5.3K
Granted 9.0K
Granted 18.2K
Granted 66.9K · Sold 57.9K
Granted 25.1K · Sold 8.9K
Granted 5.7K
Granted 34.2K · Bought 2.5K · Sold 17.5K
Granted 9.0K · Sold 2.1K
Granted 9.0K · Sold 8.8K
Granted 9.0K · Bought 250 · Sold 2.6K
Granted 5.3K
Granted 11.3K · Sold 3.8K
Granted 5.9K · Sold 3.9K
Granted 14.0K · Sold 8.8K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| CEP IV Participations, S.a r.l. SICAR +7 co-filers10% owner · 1 transaction | — | 6.48Mas of May 2023 | — | — | 2.00M |
| CG Subsidiary Holdings L.L.C. +7 co-filers10% owner · 1 transaction | — | 6.48Mas of May 2023 | — | — | 2.00M |
| Lee John Tseng-ChungPresident & CEO, Director · 52 transactions | +464.1% | 144.7K | 282.7K | — | 40.0K |
| Wild GeoffreyDirector · 1 transaction | — | 107.6Kas of Aug 2022 | 1.8K | — | — |
| Colella Gerard GDirector · 13 transactions | — | 68.2Kas of May 2025 | 8.2K | 1.0K | 41.0K |
| Burke Kathleen FlahertyEVP, GC & Secretary · 50 transactions | +38.8% | 49.4K | 60.6K | — | 27.6K |
| Colella Gerald GDirector · 10 transactions | — | 29.0K | 781.96 | — | 40.0K |
| Schreiner James AlanEVP & COO · 49 transactions | +853.9% | 19.2K | 45.8K | — | 10.9K |
| Mora ElizabethDirector · 25 transactions | +23.9% | 19.1K | 9.0K | — | 5.3K |
| Batra RajDirector · 5 transactions | +124.4% | 16.2K | 9.0K | — | — |
| Gitin Mark MiltonEVP & GM, PSD · 21 transactions | +261.2% | 15.7Kas of Feb 2024 | 18.2K | — | — |
| Bagshaw Seth HEVP, CFO & Treasurer · 39 transactions | -53.3% | 12.6Kas of Feb 2024 | 66.9K | — | 57.9K |
| Taranto Eric RobertEVP & GM, VSD · 37 transactions | +259.3% | 12.6K | 25.1K | — | 8.9K |
| Warner Michelle MDirector · 3 transactions | +112.1% | 10.9Kas of May 2024 | 5.7K | — | — |
| Henry David PhilipEVP, Global Str Mktg & GM, MSD · 39 transactions | +477.2% | 10.4K | 34.2K | 2.5K | 17.5K |
| Donahue Joseph BDirector · 6 transactions | +220% | 10.0K | 9.0K | — | 2.1K |
| Moloney Jacqueline FDirector · 24 transactions | -1.8% | 8.8K | 9.0K | — | 8.8K |
| Cannone Peter IIIDirector · 8 transactions | +579.6% | 7.8K | 9.0K | 250 | 2.6K |
| Jabre Wissam GDirector · 3 transactions | — | 5.3K | 5.3K | — | — |
| Williams John EdwardEVP & GM, PSD · 20 transactions | — | 4.6K | 11.3K | — | 3.8K |
| McCarthy Michelle MSVP & Chief Accounting Officer · 10 transactions | — | 1.55 | 5.9K | — | 3.9K |
| Mayampurath RamakumarEVP & CFO · 6 transactions | — | 1.14 | 14.0K | — | 8.8K |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 5 years: -4.28M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.