Burke Kathleen Flaherty
Officer · MKSI
As of 2026-09-16, Burke Kathleen Flaherty has 81 Form 4 transactions on record across 1 company — 52 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Reconstructed holdings
- Direct $11.6M
- Indirect $0
| MKSI | direct | 49,439 sh | $11.6M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-05-11 | MKSI | Sale | 4,355 @ $319.94 | $1.4M | −8.1% of holding | 49,439 | Form 4 |
| 2026-02-20 | MKSI | Sale | 4,254 @ $250.00 | $1.1M | −7.3% of holding | 53,794 | Form 4 |
79 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-02-17 | MKSI | Withheld for tax | 5,318 | 58,048 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 563 | 21,534 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 1,788 | 22,097 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 3,451 | 23,884 | Form 4 |
| 2026-02-17 | MKSI | Award / grant | 3,328 | 27,335 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 2,493 | 63,366 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 3,451 | 54,611 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 563 | 56,961 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 1,788 | 56,399 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 3,451 | 54,611 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 2,336 | 60,873 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 1,576 | 58,537 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 2,493 | 15,129 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 2,336 | 17,622 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 1,576 | 19,958 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 563 | 21,534 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 1,788 | 22,097 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 3,451 | 23,884 | Form 4 |
| 2026-02-17 | MKSI | Award / grant | 3,328 | 27,335 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 2,493 | 63,366 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 2,336 | 60,873 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 1,576 | 58,537 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 563 | 56,961 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 1,788 | 56,399 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 2,493 | 15,129 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 2,336 | 17,622 | Form 4 |
| 2026-02-17 | MKSI | Option exercise | 1,576 | 19,958 | Form 4 |
| 2026-02-08 | MKSI | Award / grant | 7,009 | 24,007 | Form 4 |
| 2026-02-08 | MKSI | Award / grant | 7,009 | 24,007 | Form 4 |
| 2025-10-31 | MKSI | Withheld for tax | 777 | 51,075 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 158 | 51,233 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 52 | 51,285 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 82 | 51,367 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 341 | 51,852 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 158 | 17,618 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 52 | 17,566 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 82 | 17,484 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 144 | 17,340 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 341 | 16,999 | Form 4 |
| 2025-10-31 | MKSI | Option exercise | 158 | 51,233 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.