MKS INC
MKSI
55 insider filings · Latest: Sep 1, 2026
Common Stock Transactions
| Txn Date | Accepted | Insider | Type | Shares | Avg Price | Value | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|---|
| Sep 1, 2026 | Sep 2 4:34 PM | Elizabeth MoraDirector | Sale | 300 | $250.96 | $75.3K | 18,845.353(D) | View → |
| Sep 1, 2026 | Sep 1 3:47 PM | Mora Elizabeth | Proposed Sale | 300 | $250.96 | $75.3K | — | View → |
| Aug 14, 2026 | Aug 17 2:11 PM | John Tseng-Chung LeeDirector, President & CEO | Sale | 10,000 | $302.01 | $3.0M | 134,776.267(D) | View → |
| Aug 14, 2026 | Aug 14 1:44 PM | Lee John Tseng-Chung | Proposed Sale | 10,000 | $302.01 | $3.0M | — | View → |
| Aug 3, 2026 | Aug 4 4:21 PM | John Edward WilliamsEVP & GM, PSD | Sale | 457 | $288.31 | $131.8K | 4,097.844(D) | View → |
| Aug 3, 2026 | Aug 3 4:47 PM | Williams John Edward | Proposed Sale | 457 | $288.31 | $131.8K | — | View → |
| Jun 12, 2026 | Jun 16 9:35 PM | James Alan SchreinerEVP & COO | Sale | 3,500 | $345.82 | $1.2M | 19,201.121(D) | View → |
| Jun 12, 2026 | Jun 12 3:06 PM | Schreiner James Alan | Proposed Sale | 3,500 | $345.82 | $1.2M | — | View → |
| Jun 10, 2026 | Jun 11 2:40 PM | James Alan SchreinerEVP & COO | Sale | 781 | $317.42 | $247.9K | 22,701.121(D) | View → |
| Jun 10, 2026 | Jun 10 2:57 PM | Schreiner James Alan | Proposed Sale | 781 | $317.42 | $247.9K | — | View → |
| Jun 5, 2026 | Jun 8 2:53 PM | Michelle M MccarthySVP & Chief Accounting Officer | Sale | 2,434 | $315.23 | $767.3K | 1.549(D) | View → |
| Jun 5, 2026 | Jun 5 2:45 PM | McCarthy Michelle M | Proposed Sale | 2,434 | $315.23 | $767.3K | — | View → |
| Jun 1, 2026 | Jun 2 7:13 PM | David Philip HenryEVP, Global Str Mktg & GM, MSD | Sale | 6,000 | $314.43 | $1.9M | 10,421.527(D) | View → |
| Jun 1, 2026 | Jun 2 7:08 PM | Elizabeth MoraDirector | Sale | 300 | $318.02 | $95.4K | 19,145.353(D) | View → |
| Jun 1, 2026 | Jun 1 6:23 PM | Henry David Philip | Proposed Sale | 6,000 | $314.43 | $1.9M | — | View → |
| Jun 1, 2026 | Jun 1 3:31 PM | Mora Elizabeth | Proposed Sale | 300 | $318.02 | $95.4K | — | View → |
| May 27, 2026 | May 28 6:07 PM | Joseph B DonahueDirector | Sale | 2,100 | $327.95 | $688.7K | 10,032.704(D) | View → |
| May 27, 2026 | May 28 6:04 PM | Gerald G ColellaDirector | Sale | 20,000 | $333.40 | $6.7M | 20,017(I) | View → |
| May 26, 2026 | May 27 9:07 PM | David Philip HenryEVP, Global Str Mktg & GM, MSD | Sale | 2,500 | $330.50 | $826.3K | 16,341.368(D) | View → |
| May 27, 2026 | May 27 8:33 PM | Donahue Joseph B | Proposed Sale | 2,100 | $327.95 | $688.7K | — | View → |
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Stock Options & Derivatives
| Txn Date | Accepted | Insider | Type | Shares | Exercise Price | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|
| Feb 8, 2026 | Feb 9 7:03 PM | James Alan SchreinerEVP & COO | Grant/Award | 5,226.759 | — | 18,244.899(D) | View → |
| Feb 8, 2026 | Feb 9 7:00 PM | John Edward WilliamsEVP & GM, PSD | Grant/Award | 2,973.357 | — | 10,317.107(D) | View → |
| Feb 8, 2026 | Feb 9 6:56 PM | Kathleen Flaherty BurkeEVP, GC & Secretary | Grant/Award | 7,008.628 | — | 24,007.365(D) | View → |
| Feb 8, 2026 | Feb 9 6:54 PM | Ramakumar MayampurathEVP & CFO | Grant/Award | 8,877.596 | — | 25,279.99(D) | View → |
| Feb 8, 2026 | Feb 9 6:51 PM | John Tseng-Chung LeeDirector, President & CEO | Grant/Award | 50,971.84 | — | 139,124.462(D) | View → |
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