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 |
|---|---|---|---|---|---|---|---|
| Aug 17, 2026 | Aug 18 6:07 PM | Renee Martel DonlanEVP, GC & CCO | Grant/Award | 954.044 | — | 4,780.571(D) | View → |
| 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 | Option Exercise | 3,238.11 | — | 8,552.717(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 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 → |
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