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: $11.6MIndirect: $0$11.6Mas of 2026-09-16
  • Direct $11.6M
  • Indirect $0
MKSIdirect49,439 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

MKSI · 81 trades
2026-05-11: Sale, 4,355 sh ($1.4M)2026-02-20: Sale, 4,254 sh ($1.1M)2026-02-17: Withheld for tax, 5,318 sh ($1.4M)2026-02-17: Option exercise, 563 sh2026-02-17: Option exercise, 1,788 sh2026-02-17: Option exercise, 3,451 sh2026-02-17: Award / grant, 3,328 sh2026-02-17: Option exercise, 2,493 sh2026-02-17: Option exercise, 3,451 sh2026-02-17: Option exercise, 563 sh2026-02-17: Option exercise, 1,788 sh2026-02-17: Option exercise, 3,451 sh2026-02-17: Option exercise, 2,336 sh2026-02-17: Option exercise, 1,576 sh2026-02-17: Option exercise, 2,493 sh2026-02-17: Option exercise, 2,336 sh2026-02-17: Option exercise, 1,576 sh2026-02-17: Option exercise, 563 sh2026-02-17: Option exercise, 1,788 sh2026-02-17: Option exercise, 3,451 sh2026-02-17: Award / grant, 3,328 sh2026-02-17: Option exercise, 2,493 sh2026-02-17: Option exercise, 2,336 sh2026-02-17: Option exercise, 1,576 sh2026-02-17: Option exercise, 563 sh2026-02-17: Option exercise, 1,788 sh2026-02-17: Option exercise, 2,493 sh2026-02-17: Option exercise, 2,336 sh2026-02-17: Option exercise, 1,576 sh2026-02-08: Award / grant, 7,009 sh2026-02-08: Award / grant, 7,009 sh2025-10-31: Withheld for tax, 777 sh ($112K)2025-10-31: Option exercise, 158 sh2025-10-31: Option exercise, 52 sh2025-10-31: Option exercise, 82 sh2025-10-31: Option exercise, 341 sh2025-10-31: Option exercise, 158 sh2025-10-31: Option exercise, 52 sh2025-10-31: Option exercise, 82 sh2025-10-31: Option exercise, 144 sh2025-10-31: Option exercise, 341 sh2025-10-31: Option exercise, 158 sh2025-10-31: Option exercise, 144 sh2025-10-31: Option exercise, 82 sh2025-10-31: Option exercise, 52 sh2025-10-31: Option exercise, 144 sh2025-10-31: Option exercise, 341 sh2025-10-31: Option exercise, 158 sh2025-10-31: Option exercise, 52 sh2025-10-31: Option exercise, 82 sh2025-10-31: Option exercise, 144 sh2025-10-31: Option exercise, 341 sh2025-02-18: Withheld for tax, 3,970 sh ($412K)2025-02-18: Option exercise, 1,648 sh2025-02-18: Option exercise, 588 sh2025-02-18: Option exercise, 1,870 sh2025-02-18: Option exercise, 3,608 sh2025-02-18: Option exercise, 1,645 sh2025-02-18: Option exercise, 2,287 sh2025-02-18: Award / grant, 7,822 sh2025-02-18: Option exercise, 1,648 sh2025-02-18: Option exercise, 588 sh2025-02-18: Option exercise, 1,870 sh2025-02-18: Option exercise, 3,608 sh2025-02-18: Option exercise, 1,645 sh2025-02-18: Option exercise, 2,287 sh2025-02-18: Option exercise, 1,648 sh2025-02-18: Option exercise, 588 sh2025-02-18: Option exercise, 1,870 sh2025-02-18: Option exercise, 3,608 sh2025-02-18: Option exercise, 1,645 sh2025-02-18: Option exercise, 2,287 sh2025-02-18: Award / grant, 7,822 sh2025-02-18: Option exercise, 1,648 sh2025-02-18: Option exercise, 588 sh2025-02-18: Option exercise, 1,870 sh2025-02-18: Option exercise, 3,608 sh2025-02-18: Option exercise, 2,287 sh2025-02-18: Option exercise, 1,645 sh2025-02-10: Award / grant, 1,766 sh2025-02-10: Award / grant, 1,766 sh

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-05-11MKSISale4,355 @ $319.94$1.4M−8.1% of holding49,439Form 4
2026-02-20MKSISale4,254 @ $250.00$1.1M−7.3% of holding53,794Form 4
79 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-02-17MKSIWithheld for tax5,31858,048Form 4
2026-02-17MKSIOption exercise56321,534Form 4
2026-02-17MKSIOption exercise1,78822,097Form 4
2026-02-17MKSIOption exercise3,45123,884Form 4
2026-02-17MKSIAward / grant3,32827,335Form 4
2026-02-17MKSIOption exercise2,49363,366Form 4
2026-02-17MKSIOption exercise3,45154,611Form 4
2026-02-17MKSIOption exercise56356,961Form 4
2026-02-17MKSIOption exercise1,78856,399Form 4
2026-02-17MKSIOption exercise3,45154,611Form 4
2026-02-17MKSIOption exercise2,33660,873Form 4
2026-02-17MKSIOption exercise1,57658,537Form 4
2026-02-17MKSIOption exercise2,49315,129Form 4
2026-02-17MKSIOption exercise2,33617,622Form 4
2026-02-17MKSIOption exercise1,57619,958Form 4
2026-02-17MKSIOption exercise56321,534Form 4
2026-02-17MKSIOption exercise1,78822,097Form 4
2026-02-17MKSIOption exercise3,45123,884Form 4
2026-02-17MKSIAward / grant3,32827,335Form 4
2026-02-17MKSIOption exercise2,49363,366Form 4
2026-02-17MKSIOption exercise2,33660,873Form 4
2026-02-17MKSIOption exercise1,57658,537Form 4
2026-02-17MKSIOption exercise56356,961Form 4
2026-02-17MKSIOption exercise1,78856,399Form 4
2026-02-17MKSIOption exercise2,49315,129Form 4
2026-02-17MKSIOption exercise2,33617,622Form 4
2026-02-17MKSIOption exercise1,57619,958Form 4
2026-02-08MKSIAward / grant7,00924,007Form 4
2026-02-08MKSIAward / grant7,00924,007Form 4
2025-10-31MKSIWithheld for tax77751,075Form 4
2025-10-31MKSIOption exercise15851,233Form 4
2025-10-31MKSIOption exercise5251,285Form 4
2025-10-31MKSIOption exercise8251,367Form 4
2025-10-31MKSIOption exercise34151,852Form 4
2025-10-31MKSIOption exercise15817,618Form 4
2025-10-31MKSIOption exercise5217,566Form 4
2025-10-31MKSIOption exercise8217,484Form 4
2025-10-31MKSIOption exercise14417,340Form 4
2025-10-31MKSIOption exercise34116,999Form 4
2025-10-31MKSIOption exercise15851,233Form 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.