ARTHUR A LEVIN
CIK 1181556 · Chief Scientific Officer · last filed 2026-06-05
"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
$1.10M
Companies
4
Total Filings
60
Lifetime Open-Market Net
-$18.21M
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 |
|---|---|---|---|---|---|---|---|
| STOK | Director | 22,216 | $29.39 | $652.9K | -$782.1K | 15 | 2026-06-05 |
| Avidity Biosciences, Inc. (RNAM) Delisted | Director | 0 | — | — | $0 | 1 | 2026-02-27 |
| RNA | Director | 39,062 | $11.49 | $448.8K | -$17.37M | 33 | 2026-01-23 |
| IONIS PHARMACEUTICALS INC (ISIS) Delisted | Vice President | 1,674 | — | — | -$60.7K | 2 | 2007-04-27 |
Recent Filings · Page 3 of 6
60 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 |
|---|---|---|---|---|---|
| 2024-09-20 | RNA | Mixed | — | -$222.5K | EDGAR |
| 2024-09-10 | RNA | Gift (G) | — | $0 | EDGAR |
| 2024-08-21 | RNA | Mixed | — | -$219.7K | EDGAR |
| 2024-07-23 | RNA | Mixed | — | -$218.9K | EDGAR |
| 2024-06-21 | RNA | Mixed | — | -$181.8K | EDGAR |
| 2024-06-20 | Avidity Biosciences, Inc. (RNAM) Delisted | Notice (144) | −20,000 | -$766.6K | EDGAR |
| 2024-06-14 | RNA | Mixed | −100,000 | -$3.81M | EDGAR |
| 2024-06-13 | Avidity Biosciences, Inc. (RNAM) Delisted | Notice (144) | −60,000 | -$2.30M | EDGAR |
| 2024-06-12 | Avidity Biosciences, Inc. (RNAM) Delisted | Notice (144) | −40,000 | -$1.16M | EDGAR |
| 2024-06-07 | STOK | Grant (A) | — | $0 | 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.