MKS INC
MKSI
53 insider filings · Latest: Aug 14, 2026
Common Stock Transactions
| Txn Date | Accepted | Insider | Type | Shares | Avg Price | Value | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|---|
| May 22, 2026 | May 26 6:15 PM | John Tseng-Chung LeeDirector, President & CEO | Sale | 10,000 | $315.48 | $3.2M | 144,696.108(D) | View → |
| May 26, 2026 | May 26 3:54 PM | Henry David Philip | Proposed Sale | 2,500 | $330.50 | $826.3K | — | View → |
| May 22, 2026 | May 22 4:53 PM | Lee John Tseng-Chung | Proposed Sale | 10,000 | $315.48 | $3.2M | — | View → |
| May 22, 2026 | May 22 4:13 PM | Mayampurath Ramakumar | Proposed Sale | 8,810 | $315.48 | $2.8M | — | View → |
| May 18, 2026 | May 19 2:46 PM | Peter Cannone IIIDirector | Sale | 1,350 | $303.40 | $409.6K | 7,794.039(D) | View → |
| May 18, 2026 | May 18 3:33 PM | CANNONE PETER III | Proposed Sale | 1,350 | $303.40 | $409.6K | — | View → |
| May 14, 2026 | May 15 2:04 PM | Jacqueline F MoloneyDirector | Sale | 1,000 | $312.20 | $312.2K | 8,775.156(D) | View → |
| May 14, 2026 | May 14 7:44 PM | Moloney Jacqueline F | Proposed Sale | 1,000 | $312.20 | $312.2K | — | View → |
| May 13, 2026 | May 14 3:12 PM | Jacqueline F MoloneyDirector | Sale | 1,400 | $318.99 | $446.6K | 9,775.156(D) | View → |
| May 13, 2026 | May 13 2:31 PM | Moloney Jacqueline F | Proposed Sale | 1,400 | $318.99 | $446.6K | — | View → |
| May 11, 2026 | May 12 7:19 PM | Eric Robert TarantoEVP & GM, VSD | Sale | 2,848.522 | $319.93 | $911.3K | 12,596.239(D) | View → |
| May 11, 2026 | May 12 7:09 PM | Kathleen Flaherty BurkeEVP, GC & Secretary | Sale | 4,355 | $319.94 | $1.4M | 49,439.485(D) | View → |
| May 11, 2026 | May 11 8:02 PM | Taranto Eric Robert | Proposed Sale | 2,849 | $319.88 | $911.3K | — | View → |
| May 11, 2026 | May 11 5:21 PM | Burke Kathleen Flaherty | Proposed Sale | 4,355 | $319.94 | $1.4M | — | View → |
| Mar 12, 2026 | Mar 13 2:19 PM | Jacqueline F MoloneyDirector | Sale | 340.107 | $213.77 | $72.7K | 10,393.197(D) | View → |
| Mar 12, 2026 | Mar 12 6:31 PM | Moloney Jacqueline F | Proposed Sale | 341 | $213.21 | $72.7K | — | View → |
| Mar 6, 2026 | Mar 9 4:01 PM | Eric Robert TarantoEVP & GM, VSD | Sale | 4,567.879 | $220.52 | $1.0M | 15,444.761(D) | View → |
| Mar 6, 2026 | Mar 6 6:09 PM | Taranto Eric Robert | Proposed Sale | 4,568 | $220.52 | $1.0M | — | View → |
| Mar 2, 2026 | Mar 3 5:18 PM | Elizabeth MoraDirector | Sale | 300 | $239.44 | $71.8K | 18,663.394(D) | View → |
| Mar 2, 2026 | Mar 2 5:07 PM | Mora Elizabeth | Proposed Sale | 300 | $239.44 | $71.8K | — | 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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