SEC CIK 1775435
Burke Kathleen Flaherty
Reported ownership across 1 company, sourced from SEC Form 4 filings and updated daily.
Current Positions
| Company | Shares Owned | As Of |
|---|---|---|
| MKSIview stock → | 49,439.485 | 2026-05-11 |
Position History — MKSI
Reported shares owned immediately after each Form 4 transaction, over time.
Recent Filings — MKSI
| Date | Activity | Shares | Price | Owned After |
|---|---|---|---|---|
| 2026-05-11 | Open-market sale | 4,355 | $319.94 | 49,439.485 |
| 2026-02-20 | Open-market sale | 4,254 | $250.00 | 53,794.485 |
| 2026-02-17 | Option exercise (derivative) | 2,493 | — | 15,128.99 |
| 2026-02-17 | Option exercise (derivative) | 2,336 | — | 17,621.99 |
| 2026-02-17 | Option exercise (derivative) | 1,576 | — | 19,957.99 |
| 2026-02-17 | Option exercise (derivative) | 562.54 | — | 21,533.99 |
| 2026-02-17 | Option exercise (derivative) | 1,787.74 | — | 22,096.53 |
| 2026-02-17 | Option exercise (derivative) | 3,450.86 | — | 23,884.26 |
| 2026-02-17 | Grant / award (derivative) | 3,327.76 | — | 27,335.12 |
| 2026-02-17 | Option exercise | 562.54 | — | 56,961.28 |
| 2026-02-17 | Option exercise | 3,450.86 | — | 54,611.01 |
| 2026-02-17 | Option exercise | 1,576 | — | 58,537.28 |
| 2026-02-17 | Option exercise | 2,336 | — | 60,873.28 |
| 2026-02-17 | Option exercise | 2,493 | — | 63,366.28 |
| 2026-02-17 | Tax withholding | 5,317.8 | $260.74 | 58,048.49 |
| 2026-02-17 | Option exercise | 1,787.74 | — | 56,398.74 |
| 2026-02-08 | Grant / award (derivative) | 7,008.63 | — | 24,007.37 |
| 2025-10-31 | Option exercise (derivative) | 144 | — | 17,339.74 |
| 2025-10-31 | Option exercise (derivative) | 82 | — | 17,483.74 |
| 2025-10-31 | Option exercise (derivative) | 341 | — | 16,998.74 |
| 2025-10-31 | Option exercise (derivative) | 158 | — | 17,617.74 |
| 2025-10-31 | Option exercise (derivative) | 52 | — | 17,565.74 |
| 2025-10-31 | Option exercise | 158 | — | 51,232.51 |
| 2025-10-31 | Tax withholding | 777 | $143.71 | 51,074.51 |
| 2025-10-31 | Option exercise | 341 | — | 51,851.51 |
| 2025-10-31 | Option exercise | 144 | — | 51,510.51 |
| 2025-10-31 | Option exercise | 82 | — | 51,366.51 |
| 2025-10-31 | Option exercise | 52 | — | 51,284.51 |
| 2025-02-18 | Option exercise (derivative) | 1,648 | — | 17,775.74 |
| 2025-02-18 | Option exercise (derivative) | 588.03 | — | 19,423.74 |
| 2025-02-18 | Option exercise (derivative) | 1,870 | — | 20,011.77 |
| 2025-02-18 | Option exercise (derivative) | 3,608 | — | 21,881.77 |
| 2025-02-18 | Option exercise (derivative) | 1,645.08 | — | 25,489.77 |
| 2025-02-18 | Option exercise (derivative) | 2,286.76 | — | 27,134.84 |
| 2025-02-18 | Grant / award (derivative) | 7,822.13 | — | 29,421.6 |
| 2025-02-18 | Option exercise | 588.03 | — | 53,244.42 |
| 2025-02-18 | Option exercise | 1,870 | — | 52,656.39 |
| 2025-02-18 | Option exercise | 3,608 | — | 50,786.39 |
| 2025-02-18 | Tax withholding | 3,970 | $103.67 | 50,922.42 |
| 2025-02-18 | Option exercise | 2,286.76 | — | 45,533.32 |
| 2025-02-18 | Option exercise | 1,648 | — | 54,892.42 |
| 2025-02-18 | Option exercise | 1,645.08 | — | 47,178.39 |
| 2025-02-10 | Grant / award (derivative) | 1,765.54 | — | 21,599.47 |
| 2024-03-01 | Open-market sale | 7,411 | $122.89 | 42,999.02 |
| 2024-02-15 | Option exercise (derivative) | 2,287 | — | 26,955.93 |
| 2024-02-15 | Option exercise (derivative) | 3,608 | — | 21,702.93 |
| 2024-02-15 | Option exercise (derivative) | 1,645 | — | 25,310.93 |
| 2024-02-15 | Option exercise (derivative) | 1,869 | — | 19,833.93 |
| 2024-02-15 | Option exercise (derivative) | 1,016.78 | — | 29,242.93 |
| 2024-02-15 | Option exercise (derivative) | 2,032.56 | — | 30,259.71 |
| 2024-02-15 | Grant / award (derivative) | 4,945.5 | — | 32,292.27 |
| 2024-02-15 | Option exercise | 3,608 | — | 53,453.02 |
| 2024-02-15 | Option exercise | 1,645 | — | 49,845.02 |
| 2024-02-15 | Tax withholding | 4,912 | $122.15 | 50,410.02 |
| 2024-02-15 | Option exercise | 1,016.78 | — | 45,913.02 |
| 2024-02-15 | Option exercise | 2,032.56 | — | 44,896.24 |
| 2024-02-15 | Option exercise | 1,869 | — | 55,322.02 |
| 2024-02-15 | Option exercise | 2,287 | — | 48,200.02 |
| 2024-02-05 | Grant / award (derivative) | 10,824.86 | — | 27,346.77 |
| 2023-08-07 | Open-market sale | 5,377.07 | $101.40 | 42,737.61 |
| 2023-08-07 | Open-market sale | 6,186 | $101.08 | 48,114.68 |
| 2023-02-15 | Grant / award (derivative) | 5,608.74 | — | 26,627.64 |
| 2023-02-15 | Option exercise (derivative) | 1,844.63 | — | 24,783.01 |
| 2023-02-15 | Option exercise (derivative) | 1,281.1 | — | 23,501.91 |
| 2023-02-15 | Option exercise (derivative) | 2,033 | — | 21,468.91 |
| 2023-02-15 | Option exercise (derivative) | 1,645 | — | 16,521.91 |
| 2023-02-15 | Option exercise (derivative) | 2,286 | — | 18,166.91 |
| 2023-02-15 | Option exercise (derivative) | 1,016 | — | 20,452.91 |
| 2023-02-15 | Option exercise | 1,645 | — | 57,624.58 |
| 2023-02-15 | Option exercise | 2,286 | — | 55,979.58 |
| 2023-02-15 | Option exercise | 1,016 | — | 53,693.58 |
| 2023-02-15 | Option exercise | 2,033 | — | 52,677.58 |
| 2023-02-15 | Option exercise | 1,281.1 | — | 50,644.58 |
| 2023-02-15 | Option exercise | 1,844.63 | — | 49,363.48 |
| 2023-02-15 | Tax withholding | 3,474 | $100.29 | 54,150.58 |
| 2023-02-08 | Grant / award (derivative) | 6,859.76 | — | 21,018.9 |
| 2022-10-28 | Option exercise (derivative) | 2,179.03 | — | 14,159.14 |
| 2022-10-28 | Tax withholding | 967 | $84.58 | 47,442.17 |
| 2022-10-28 | Option exercise | 2,179.03 | — | 48,409.17 |
| 2022-04-29 | Grant / award (derivative) | 4,935.08 | — | 16,338.17 |
| 2022-02-15 | Option exercise (derivative) | 1,844 | — | 15,732.1 |
| 2022-02-15 | Option exercise (derivative) | 2,032 | — | 12,419.1 |
| 2022-02-15 | Option exercise (derivative) | 1,281 | — | 14,451.1 |
| 2022-02-15 | Option exercise (derivative) | 1,016 | — | 11,403.1 |
| 2022-02-15 | Option exercise (derivative) | 1,574.18 | — | 17,576.1 |
| 2022-02-15 | Option exercise (derivative) | 1,290.83 | — | 19,150.28 |
| 2022-02-15 | Tax withholding | 3,708 | $152.55 | 46,128.92 |
| 2022-02-15 | Option exercise | 1,016 | — | 49,836.92 |
| 2022-02-15 | Option exercise | 2,032 | — | 48,820.92 |
| 2022-02-15 | Option exercise | 1,281 | — | 46,788.92 |
| 2022-02-15 | Option exercise | 1,844 | — | 45,507.92 |
| 2022-02-15 | Option exercise | 1,574.18 | — | 43,663.92 |
| 2022-02-15 | Option exercise | 1,290.83 | — | 42,089.74 |
| 2022-01-21 | Grant / award (derivative) | 6,097.56 | — | 20,441.11 |
| 2021-10-28 | Option exercise (derivative) | 2,179.03 | — | 14,343.55 |
| 2021-10-28 | Option exercise | 2,179.03 | — | 41,698.54 |
| 2021-10-28 | Tax withholding | 967 | $145.74 | 40,731.54 |
| 2021-02-16 | Grant / award (derivative) | 3,048.78 | — | 24,633.23 |
| 2021-02-16 | Option exercise (derivative) | 1,290.83 | — | 21,220.76 |
| 2021-02-16 | Option exercise (derivative) | 1,574.18 | — | 19,646.58 |
| 2021-02-16 | Option exercise (derivative) | 1,050.32 | — | 22,511.59 |
| 2021-02-16 | Option exercise (derivative) | 1,071.32 | — | 23,561.91 |
| 2021-02-16 | Option exercise (derivative) | 1,280 | — | 16,522.58 |
| 2021-02-16 | Option exercise (derivative) | 1,844 | — | 17,802.58 |
| 2021-02-16 | Option exercise | 1,071.32 | — | 35,615.9 |
| 2021-02-16 | Option exercise | 1,050.32 | — | 36,666.21 |
| 2021-02-16 | Option exercise | 1,290.83 | — | 37,957.04 |
| 2021-02-16 | Option exercise | 1,574.18 | — | 39,531.22 |
| 2021-02-16 | Option exercise | 1,844 | — | 41,375.22 |
| 2021-02-16 | Option exercise | 1,280 | — | 42,655.22 |
| 2021-02-16 | Tax withholding | 3,225 | $172.20 | 39,430.22 |
| 2021-01-25 | Grant / award (derivative) | 5,532.63 | — | 21,584.45 |
| 2020-02-18 | Option exercise (derivative) | 1,071 | — | 19,966.84 |
| 2020-02-18 | Option exercise (derivative) | 1,290.83 | — | 17,626.01 |
| 2020-02-18 | Option exercise (derivative) | 1,050 | — | 18,916.84 |
| 2020-02-18 | Option exercise (derivative) | 1,574.18 | — | 16,051.82 |
| 2020-02-18 | Option exercise (derivative) | 1,293.4 | — | 21,037.84 |
| 2020-02-18 | Option exercise (derivative) | 1,564.65 | — | 22,331.24 |
| 2020-02-18 | Grant / award (derivative) | 3,842.1 | — | 23,895.89 |
| 2020-02-18 | Option exercise | 1,071 | — | 32,859.06 |
| 2020-02-18 | Option exercise | 1,564.65 | — | 30,494.66 |
| 2020-02-18 | Option exercise | 1,574.18 | — | 36,774.07 |
| 2020-02-18 | Option exercise | 1,290.83 | — | 35,199.89 |
| 2020-02-18 | Option exercise | 1,050 | — | 33,909.06 |
| 2020-02-18 | Tax withholding | 2,467 | $113.87 | 34,307.07 |
| 2020-02-18 | Option exercise | 1,293.4 | — | 31,788.06 |
| 2020-01-27 | Grant / award (derivative) | 3,872.49 | — | 20,053.79 |
| 2019-10-30 | Open-market sale | 10,384 | $110.55 | 28,777.89 |
| 2019-10-28 | Grant / award (derivative) | 4,358.06 | — | 16,181.3 |
| 2019-05-08 | — | — | — | 38,986.96 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.