Kathleen Flaherty Burke serves as Executive at MKS INSTRUMENTS INC, where they oversee executive responsibilities. Since joining the company, Kathleen Flaherty Burke has executed 51 insider transactions totaling $4.3M, demonstrating a bearish approach to their equity position. Their most recent transaction on Feb 20, 2026 involved selling 4,254 shares valued at $1.1M.
Kathleen Flaherty Burke currently holds 53,794.49 shares of MKS INSTRUMENTS INC (MKSI), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Kathleen Flaherty Burke has been a net seller of MKSI stock. They have purchased $0 and sold $4.3M worth of shares.
Kathleen Flaherty Burke's most recent insider trade was on Feb 20, 2026, when they sold 4,254 shares at $250.00 per share.
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| $N/A |
| Discretionary |
| Oct 31, 2025 | MKSI | $0 | Option Exercise | 158 | $N/A | Discretionary |
| Oct 31, 2025 | MKSI | $111.7K | Payment | 777 | $143.71 | Discretionary |
| Oct 31, 2025 | MKSI | $0 | Option Exercise | 341 | $N/A | Discretionary |
| Oct 31, 2025 | MKSI | $0 | Option Exercise | 144 | $N/A | Discretionary |
| Oct 31, 2025 | MKSI | $0 | Option Exercise | 82 | $N/A | Discretionary |
| Oct 31, 2025 | MKSI | $0 | Option Exercise | 52 | $N/A | Discretionary |
| Mar 1, 2024 | MKSI | $910.7K | Sale | 7,411 | $122.89 | Discretionary |
| Feb 15, 2024 | MKSI | $0 | Option Exercise | 3,608 | $N/A | Discretionary |
| Feb 15, 2024 | MKSI | $0 | Option Exercise | 1,645 | $N/A | Discretionary |
| Feb 15, 2024 | MKSI | $600.0K | Payment | 4,912 | $122.15 | Discretionary |
| Feb 15, 2024 | MKSI | $0 | Option Exercise | 1,016.78 | $N/A | Discretionary |
| Feb 15, 2024 | MKSI | $0 | Option Exercise | 2,032.56 | $N/A | Discretionary |
| Feb 15, 2024 | MKSI | $0 | Option Exercise | 1,869 | $N/A | Discretionary |
| Feb 15, 2024 | MKSI | $0 | Option Exercise | 2,287 | $N/A | Discretionary |
| Aug 7, 2023 | MKSI | $545.2K | Sale | 5,377.07 | $101.40 | Discretionary |
| Aug 7, 2023 | MKSI | $625.3K | Sale | 6,186 | $101.08 | Discretionary |
| Feb 15, 2023 | MKSI | $0 | Option Exercise | 1,645 | $N/A | Discretionary |
| Feb 15, 2023 | MKSI | $0 | Option Exercise | 2,286 | $N/A | Discretionary |
| Feb 15, 2023 | MKSI | $0 | Option Exercise | 1,016 | $N/A | Discretionary |
| Feb 15, 2023 | MKSI | $0 | Option Exercise | 2,033 | $N/A | Discretionary |
| Feb 15, 2023 | MKSI | $0 | Option Exercise | 1,281.1 | $N/A | Discretionary |
| Feb 15, 2023 | MKSI | $0 | Option Exercise | 1,844.63 | $N/A | Discretionary |
| Feb 15, 2023 | MKSI | $348.4K | Payment | 3,474 | $100.29 | Discretionary |
| Oct 28, 2022 | MKSI | $81.8K | Payment | 967 | $84.58 | Discretionary |
| Oct 28, 2022 | MKSI | $0 | Option Exercise | 2,179.03 | $N/A | Discretionary |
| Feb 15, 2022 | MKSI | $565.7K | Payment | 3,708 | $152.55 | Discretionary |
| Feb 15, 2022 | MKSI | $0 | Option Exercise | 1,016 | $N/A | Discretionary |
| Feb 15, 2022 | MKSI | $0 | Option Exercise | 2,032 | $N/A | Discretionary |