🕵️ MKS Inc ($MKSI)
SEC insider & ownership activity, last 12 months · CIK 1049502 · every row links its SEC filing
Over the last 12 months insiders sold $41.1M with no open-market buying against it. Gerald G. Colella sold $11.7M (Feb–May). 2 planned sales are pending, the largest $447K (Jacqueline F. Moloney). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 13 sellers, $41.1M (48 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Gerald G. Colella | 0 | – | 9 | $11.7M | May 27, 2026 |
| Lee John Tseng-Chung | 0 | – | 5 | $10.9M | May 22, 2026 |
| Henry David Philip | 0 | – | 4 | $3.9M | Jun 1, 2026 |
| Mayampurath Ramakumar | 0 | – | 1 | $2.8M | May 22, 2026 |
| Schreiner James Alan | 0 | – | 7 | $2.7M | Jun 12, 2026 |
| Burke Kathleen Flaherty | 0 | – | 2 | $2.5M | May 11, 2026 |
| Taranto Eric Robert | 0 | – | 3 | $2.3M | May 11, 2026 |
| Michelle M. McCarthy | 0 | – | 3 | $1.1M | Jun 5, 2026 |
| Jacqueline F. Moloney | 0 | – | 6 | $1.1M | May 14, 2026 |
| Cannone Peter III | 0 | – | 2 | $732K | May 18, 2026 |
| Joseph B. Donahue | 0 | – | 1 | $689K | May 27, 2026 |
| Williams John Edward | 0 | – | 1 | $524K | Feb 20, 2026 |
| Mora Elizabeth | 0 | – | 4 | $245K | Jun 1, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Blackrock, Inc. | 8.8% | 13G | Oct 17, 2025 | filing ↗ | |
| Invesco Ltd. | 6.5% | 13G | Feb 12, 2026 | filing ↗ | |
| Vanguard Portfolio Management | 5.5% | 13G | Apr 29, 2026 | filing ↗ | |
| Vanguard Capital Management | 5.2% | 13G | Apr 30, 2026 | filing ↗ | |
| JPMorgan Chase & Co | 5.0% | 13G | Jul 16, 2026 | filing ↗ | |
| Victory Capital Management, Inc. | exited | 13G | Jul 24, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Schreiner James Alan | $1.2M | Jun 12, 2026 | filing ↗ |
| Schreiner James Alan | $248K | Jun 10, 2026 | filing ↗ |
| Michelle M. McCarthy | $767K | Jun 5, 2026 | filing ↗ |
| Henry David Philip | $1.9M | Jun 1, 2026 | filing ↗ |
| Mora Elizabeth | $95K | Jun 1, 2026 | filing ↗ |
| Joseph B. Donahue | $689K | May 27, 2026 | filing ↗ |
| Gerald G Colella 2019 Trust U/A DTD 5/4/2019 | $6.7M | May 27, 2026 | filing ↗ |
| Henry David Philip | $826K | May 26, 2026 | filing ↗ |
| Lee John Tseng-Chung | $3.2M | May 22, 2026 | filing ↗ |
| Mayampurath Ramakumar | $2.8M | May 22, 2026 | filing ↗ |
| Cannone Peter III | $410K | May 18, 2026 | filing ↗ |
| Jacqueline F. Moloney | $312K | May 14, 2026 | filing ↗ |
| Jacqueline F. Moloney | $447K | May 13, 2026 | filing ↗ |
| Taranto Eric Robert | $911K | May 11, 2026 | filing ↗ |
| Burke Kathleen Flaherty | $1.4M | May 11, 2026 | filing ↗ |
| Jacqueline F. Moloney | $73K | Mar 12, 2026 | filing ↗ |
| Taranto Eric Robert | $1.0M | Mar 6, 2026 | filing ↗ |
| Mora Elizabeth | $72K | Mar 2, 2026 | filing ↗ |
| Schreiner James Alan | $1.0M | Feb 24, 2026 | filing ↗ |
| Henry David Philip | $523K | Feb 20, 2026 | filing ↗ |
| Cannone Peter III | $323K | Feb 20, 2026 | filing ↗ |
| Lee John Tseng-Chung | $7.4M | Feb 20, 2026 | filing ↗ |
| Williams John Edward | $524K | Feb 20, 2026 | filing ↗ |
| Taranto Eric Robert | $360K | Feb 20, 2026 | filing ↗ |
| Michelle M. McCarthy | $367K | Feb 20, 2026 | filing ↗ |
| Burke Kathleen Flaherty | $1.1M | Feb 20, 2026 | filing ↗ |
| Jacqueline F. Moloney | $205K | Feb 20, 2026 | filing ↗ |
| Gerald Colella 2019 Trust U/A DTD 5/4/2019 | $5.1M | Feb 20, 2026 | filing ↗ |
| Mora Elizabeth | $48K | Dec 2, 2025 | filing ↗ |
| Schreiner James Alan | $99K | Oct 22, 2025 | filing ↗ |
| Jacqueline F. Moloney | $37K | Oct 1, 2025 | filing ↗ |
| Henry David Philip | $650K | Sep 18, 2025 | filing ↗ |
| Schreiner James Alan | $104K | Sep 18, 2025 | filing ↗ |
| Mora Elizabeth | $30K | Sep 2, 2025 | filing ↗ |
| Jacqueline F. Moloney | $28K | Aug 1, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Officer/director changes (5.02) | May 11, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 11, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 11, 2026 | filing ↗ |
| Earnings (2.02) | May 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 6, 2026 | filing ↗ |
| Officer/director changes (5.02) | Mar 31, 2026 | filing ↗ |
| Earnings (2.02) | Feb 17, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 17, 2026 | filing ↗ |
| Material agreement (1.01) | Feb 4, 2026 | filing ↗ |
| New financial obligation (2.03) | Feb 4, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 4, 2026 | filing ↗ |
| Other events (8.01) | Jan 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 26, 2026 | filing ↗ |
| Earnings (2.02) | Jan 21, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 21, 2026 | filing ↗ |
| Earnings (2.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |
| Earnings (2.02) | Aug 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 6, 2025 | filing ↗ |