Stuart A Arbuckle
CIK 1557290 · EVP, COO · last filed 2026-06-25
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$36.05M
Companies
6
Total Filings
159
Lifetime Open-Market Net
-$139.91M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| RYTM | Director | 11,712 | $112.84 | $1.32M | $0 | 10 | 2026-06-25 |
| PRAX | Director | 2,537 | $370.68 | $940.4K | $0 | 2 | 2026-06-12 |
| ALNY | Director | 671 | $221.20 | $148.4K | $0 | 2 | 2026-05-22 |
| VRTX | EVP, COO | 63,508 | $529.65 | $33.64M | -$139.91M | 122 | 2025-07-02 |
| ImmunoGen, Inc. (IMGN) Delisted | Director | 0 | $31.23 | $0 | $0 | 11 | 2024-02-12 |
| Dare Bioscience, Inc. (CERU) Delisted | Director | 1,310 | — | — | $0 | 4 | 2017-01-05 |
Recent Filings · Page 2 of 16
159 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-02-26 | VRTX | Tax (F) | −4,716 | -$2.28M | EDGAR |
| 2025-02-19 | VRTX | Tax (F) | −2,724 | -$1.26M | EDGAR |
| 2025-02-14 | VRTX | Grant (A) | +7,903 | $0 | EDGAR |
| 2025-02-12 | VRTX | Tax (F) | −3,220 | -$1.51M | EDGAR |
| 2025-02-06 | VRTX | Grant (A) | +23,072 | $0 | EDGAR |
| 2024-06-25 | RYTM | Exer (M) | +3,000 | $0 | EDGAR |
| 2024-06-20 | RYTM | Grant (A) | — | $0 | EDGAR |
| 2024-05-17 | VRTX | Sell (S) | −69 | -$29.7K | EDGAR |
| 2024-05-15 | VRTX | Notice (144) | −69 | -$29.7K | EDGAR |
| 2024-02-27 | VRTX | Mixed | −9,748 | -$4.18M | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.