MKS INC
MKSI
38 insider filings · Latest: May 11, 2026
Common Stock Transactions
| Txn Date | Accepted | Insider | Type | Shares | Avg Price | Value | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|---|
| Feb 20, 2026 | Feb 23 7:30 PM | John Edward WilliamsEVP & GM, PSD | Sale | 2,042.625 | $256.41 | $523.7K | 3,640.099(D) | View → |
| Feb 20, 2026 | Feb 23 7:28 PM | Kathleen Flaherty BurkeEVP, GC & Secretary | Sale | 4,254 | $250.00 | $1.1M | 53,794.485(D) | View → |
| Feb 20, 2026 | Feb 23 7:25 PM | John Tseng-Chung LeeDirector, President & CEO | Sale | 30,000 | $256.77 | $7.7M | 154,696.108(D) | View → |
| Feb 20, 2026 | Feb 20 9:20 PM | Gerald Colella 2019 Trust u/a dtd 5/4/2019 | Proposed Sale | 20,000 | $252.90 | $5.1M | — | View → |
| Feb 20, 2026 | Feb 20 7:59 PM | Henry David Philip | Proposed Sale | 2,000 | $261.56 | $523.1K | — | View → |
| Feb 20, 2026 | Feb 20 6:53 PM | CANNONE PETER III | Proposed Sale | 1,250 | $258.06 | $322.6K | — | View → |
| Feb 20, 2026 | Feb 20 5:09 PM | Lee John Tseng-Chung | Proposed Sale | 30,000 | $247.55 | $7.4M | — | View → |
| Feb 20, 2026 | Feb 20 4:23 PM | Williams John Edward | Proposed Sale | 2,043 | $256.36 | $523.7K | — | View → |
| Feb 20, 2026 | Feb 20 4:08 PM | Taranto Eric Robert | Proposed Sale | 1,453 | $247.50 | $359.6K | — | View → |
| Feb 20, 2026 | Feb 20 4:06 PM | McCarthy Michelle M | Proposed Sale | 1,466 | $250.00 | $366.5K | — | View → |
| Feb 20, 2026 | Feb 20 4:03 PM | Burke Kathleen Flaherty | Proposed Sale | 4,254 | $250.00 | $1.1M | — | View → |
| Feb 20, 2026 | Feb 20 3:55 PM | Moloney Jacqueline F | Proposed Sale | 829 | $247.55 | $205.2K | — | View → |
| Dec 2, 2025 | Dec 2 3:05 PM | Mora Elizabeth | Proposed Sale | 300 | $158.81 | $47.6K | — | View → |
| Oct 22, 2025 | Oct 22 1:37 PM | Schreiner James Alan | Proposed Sale | 711 | $138.68 | $98.6K | — | View → |
| Oct 1, 2025 | Oct 1 1:48 PM | Moloney Jacqueline F | Proposed Sale | 300 | $122.14 | $36.6K | — | View → |
| Sep 18, 2025 | Sep 18 4:54 PM | Henry David Philip | Proposed Sale | 5,000 | $130.00 | $650.0K | — | View → |
| Sep 18, 2025 | Sep 18 2:02 PM | Schreiner James Alan | Proposed Sale | 838 | $124.00 | $103.9K | — | View → |
| Sep 2, 2025 | Sep 2 4:10 PM | Mora Elizabeth | Proposed Sale | 300 | $99.85 | $30.0K | — | View → |
| Aug 1, 2025 | Aug 1 2:56 PM | Moloney Jacqueline F | Proposed Sale | 300 | $92.10 | $27.6K | — | View → |
| Jul 7, 2025 | Jul 7 5:31 PM | Schreiner James Alan | Proposed Sale | 957 | $102.44 | $98.0K | — | View → |
Stock Options & Derivatives
| Txn Date | Accepted | Insider | Type | Shares | Exercise Price | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|
| Apr 17, 2026 | Apr 20 3:31 PM | John Edward WilliamsEVP & GM, PSD | Option Exercise | 1,740.714 | — | 6,812.003(D) | View → |
| Apr 15, 2026 | Apr 16 7:29 PM | Michelle M MccarthySVP & Chief Accounting Officer | Grant/Award | 1,672.862 | — | 11,199.16(D) | View → |
| Apr 15, 2026 | Apr 16 7:29 PM | Michelle M MccarthySVP & Chief Accounting Officer | Option Exercise | 3,811 | — | 7,388.16(D) | View → |
| Feb 17, 2026 | Feb 18 10:07 PM | Eric Robert TarantoEVP & GM, VSD | Grant/Award | 1,758.956 | — | 14,501.557(D) | View → |
| Feb 17, 2026 | Feb 18 10:07 PM | Eric Robert TarantoEVP & GM, VSD | Option Exercise | 6,472.891 | — | 8,028.666(D) | View → |
| Feb 17, 2026 | Feb 18 10:05 PM | David Philip HenryEVP, Global Str Mktg & GM, MSD | Option Exercise | 9,281.817 | — | 12,093.416(D) | View → |
| Feb 17, 2026 | Feb 18 10:05 PM | David Philip HenryEVP, Global Str Mktg & GM, MSD | Grant/Award | 2,567.126 | — | 21,375.233(D) | View → |
| Feb 17, 2026 | Feb 18 10:02 PM | James Alan SchreinerEVP & COO | Option Exercise | 9,225.392 | — | 11,396.475(D) | View → |
| Feb 17, 2026 | Feb 18 10:02 PM | James Alan SchreinerEVP & COO | Grant/Award | 2,376.968 | — | 20,621.867(D) | View → |
| Feb 17, 2026 | Feb 18 10:00 PM | John Edward WilliamsEVP & GM, PSD | Grant/Award | 1,473.72 | — | 11,790.827(D) | View → |
| Feb 17, 2026 | Feb 18 10:00 PM | John Edward WilliamsEVP & GM, PSD | Option Exercise | 3,238.11 | — | 8,552.717(D) | View → |
| Feb 17, 2026 | Feb 18 9:58 PM | Ramakumar MayampurathEVP & CFO | Option Exercise | 5,660.08 | — | 23,898.453(D) | View → |
| Feb 17, 2026 | Feb 18 9:58 PM | Ramakumar MayampurathEVP & CFO | Grant/Award | 4,278.543 | — | 29,558.533(D) | View → |
| Feb 17, 2026 | Feb 18 9:55 PM | Kathleen Flaherty BurkeEVP, GC & Secretary | Grant/Award | 3,327.755 | — | 27,335.12(D) | View → |
| Feb 17, 2026 | Feb 18 9:55 PM | Kathleen Flaherty BurkeEVP, GC & Secretary | Option Exercise | 12,206.134 | — | 15,128.986(D) | View → |
| Feb 17, 2026 | Feb 18 9:52 PM | John Tseng-Chung LeeDirector, President & CEO | Option Exercise | 69,889.252 | — | 84,828.121(D) | View → |
| Feb 17, 2026 | Feb 18 9:52 PM | John Tseng-Chung LeeDirector, President & CEO | Grant/Award | 15,592.911 | — | 154,717.373(D) | View → |
| Feb 8, 2026 | Feb 9 7:08 PM | Eric Robert TarantoEVP & GM, VSD | Grant/Award | 3,504.314 | — | 12,742.601(D) | View → |
| Feb 8, 2026 | Feb 9 7:06 PM | David Philip HenryEVP, Global Str Mktg & GM, MSD | Grant/Award | 5,521.949 | — | 18,808.107(D) | View → |
| Feb 8, 2026 | Feb 9 7:03 PM | James Alan SchreinerEVP & COO | Grant/Award | 5,226.759 | — | 18,244.899(D) | View → |
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