Arbuckle Stuart A

Director · Officer · RYTM, PRAX, ALNY, VRTX

As of 2026-09-16, Arbuckle Stuart A has 27 Form 4 transactions on record across 4 companies — 13 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: $33.3MIndirect: $0$33.3Mas of 2026-09-16
  • Direct $33.3M
  • Indirect $0
VRTXdirect63,368 sh$32.5M
ALNYdirect1,441 sh$345K
RYTMdirect2,324 sh$228K
PRAXdirect648 sh$200K

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

RYTM · 10 trades
2026-06-24: Award / grant, 2,324 sh ($0)2026-06-24: Award / grant, 3,691 sh ($0)2026-06-23: Option exercise, 4,712 sh ($0)2026-06-23: Option exercise, 4,712 sh2026-06-23: Option exercise, 4,712 sh2025-06-24: Award / grant, 4,712 sh ($0)2025-06-24: Award / grant, 7,037 sh ($0)2025-06-18: Option exercise, 4,000 sh ($0)2025-06-18: Option exercise, 4,000 sh2025-06-18: Option exercise, 4,000 sh
VRTX · 9 trades
2025-07-01: Withheld for tax, 37,243 sh ($16.8M)2025-05-13: Award / grant, 37,622 sh ($0)2025-02-26: Withheld for tax, 7,071 sh ($3.4M)2025-02-24: Withheld for tax, 4,716 sh ($2.3M)2025-02-14: Withheld for tax, 2,724 sh ($1.3M)2025-02-12: Award / grant, 7,903 sh ($0)2025-02-10: Withheld for tax, 3,220 sh ($1.5M)2025-02-04: Award / grant, 8,448 sh ($0)2025-02-04: Award / grant, 14,624 sh ($0)
PRAX · 5 trades
2026-06-10: Award / grant, 648 sh ($0)2026-06-10: Award / grant, 1,371 sh ($0)2026-02-06: Award / grant, 688 sh ($0)2026-02-06: Award / grant, 224 sh ($0)2026-02-06: Award / grant, 478 sh ($0)
ALNY · 3 trades
2026-05-20: Award / grant, 1,441 sh ($0)2026-05-20: Award / grant, 671 sh ($0)2026-01-05: Award / grant, 3,279 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
27 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-06-24RYTMAward / grant2,3242,324Form 4
2026-06-24RYTMAward / grant3,6913,691Form 4
2026-06-23RYTMOption exercise4,7120Form 4
2026-06-23RYTMOption exercise4,71211,712Form 4
2026-06-23RYTMOption exercise4,71211,712Form 4
2026-06-10PRAXAward / grant648648Form 4
2026-06-10PRAXAward / grant1,3712,537Form 4
2026-05-20ALNYAward / grant1,4411,441Form 4
2026-05-20ALNYAward / grant671671Form 4
2026-02-06PRAXAward / grant688688Form 4
2026-02-06PRAXAward / grant224224Form 4
2026-02-06PRAXAward / grant4781,166Form 4
2026-01-05ALNYAward / grant3,2793,279Form 4
2025-07-01VRTXWithheld for tax37,24363,368Form 4
2025-06-24RYTMAward / grant4,7124,712Form 4
2025-06-24RYTMAward / grant7,0377,037Form 4
2025-06-18RYTMOption exercise4,0000Form 4
2025-06-18RYTMOption exercise4,0007,000Form 4
2025-06-18RYTMOption exercise4,0007,000Form 4
2025-05-13VRTXAward / grant37,622100,611Form 4
2025-02-26VRTXWithheld for tax7,07162,935Form 4
2025-02-24VRTXWithheld for tax4,71670,006Form 4
2025-02-14VRTXWithheld for tax2,72474,722Form 4
2025-02-12VRTXAward / grant7,90377,446Form 4
2025-02-10VRTXWithheld for tax3,22069,543Form 4
2025-02-04VRTXAward / grant8,44872,763Form 4
2025-02-04VRTXAward / grant14,62464,315Form 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.