| Date | Name | Title | Action | No Shares | Price Per Share |
|---|---|---|---|---|---|
Insider Transactions For MKSI | |||||
| 2026-02-08 | Schreiner, James Alan | EVP & COO | Purchased | 5226.76 | $0.00 |
| 2026-02-08 | Williams, John Edward | EVP & GM, PSD | Purchased | 2973.36 | $0.00 |
| 2026-02-08 | Lee, John Tseng-chung | Director, President & CEO | Purchased | 50971.84 | $0.00 |
| 2026-02-08 | Taranto, Eric Robert | EVP & GM, VSD | Purchased | 3504.31 | $0.00 |
| 2026-02-08 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Purchased | 7008.63 | $0.00 |
| 2026-02-08 | Mayampurath, Ramakumar | EVP & CFO | Purchased | 8877.6 | $0.00 |
| 2026-02-08 | Henry, David Philip | EVP, Global Str Mktg & GM, MSD | Purchased | 5521.95 | $0.00 |
| 2025-12-02 | Mora, Elizabeth | Director | Sold | 300 | $158.81 |
| 2025-11-17 | Mayampurath, Ramakumar | EVP & CFO | Purchased | 8295 | $0.00 |
| 2025-11-17 | Mayampurath, Ramakumar | EVP & CFO | Sold | 2628 | $142.74 |
| 2025-11-17 | Mayampurath, Ramakumar | EVP & CFO | Sold | 8295 | $0.00 |
| 2025-10-31 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Sold | 82 | $0.00 |
| 2025-10-31 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Sold | 158 | $0.00 |
| 2025-10-31 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Sold | 777 | $143.71 |
| 2025-10-31 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Purchased | 158 | $0.00 |
| 2025-10-31 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Purchased | 52 | $0.00 |
| 2025-10-31 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Purchased | 82 | $0.00 |
| 2025-10-31 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Purchased | 144 | $0.00 |
| 2025-10-31 | Burke, Kathleen Flaherty | EVP, GC & Secretary | Purchased | 341 | $0.00 |
| 2025-10-31 | Lee, John Tseng-chung | Director, President & CEO | Sold | 1651 | $0.00 |