Cox John — SEC Form 4 filings
SEC reporting owner CIK 1498428. 15 Form 4 filings on record with FilingPulse; latest filed 2026-09-08.
Transaction summary — filings shown
Covers all 15 filings on record, filed 2024-03-27 to 2026-09-08. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): 9 legs across 2 filings — 132,000 shares, $1,968,216 total (shares × price as filed).
- Open-market sales (code S, non-derivative): 9 legs across 9 filings — 32,793 shares, $581,333 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 10.
- Largest priced transaction: purchase of 100,000 shares @ $9.11 ($911,000) in Dyne Therapeutics, Inc., filed 2025-07-15.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Dyne Therapeutics, Inc. (DYN) | CEO & President, Director | 15 | 9 legs · 132,000 sh · $1,968,216 | 9 legs · 32,793 sh · $581,333 | 10 |
Form 4 filings — Cox John
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-08 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 5,658 @ $18.88 | EDGAR |
| 2026-08-17 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 4,986 @ $26.28 | EDGAR |
| 2026-06-17 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 2,683 @ $18.33 | EDGAR |
| 2026-05-14 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 3,311 @ $18.36 | EDGAR |
| 2026-03-06 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 2,732 @ $14.90 | EDGAR |
| 2026-02-17 | 4 | Dyne Therapeutics, Inc. (DYN) | Grant/award (A): 180,000 @ $0 · Grant/award (A): 285,000 (derivative) @ $0 | EDGAR |
| 2025-12-05 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 2,662 @ $20.72 | EDGAR |
| 2025-09-09 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 2,640 @ $13.41 | EDGAR |
| 2025-07-18 | 4 | Dyne Therapeutics, Inc. (DYN) | Grant/award (A): 197,285 (derivative) @ $0 | EDGAR |
| 2025-07-15 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 100,000 @ $9.11 · Gift (G): 10,000 @ $0 · Gift (G): 10,000 @ $0 · Gift (G): 10,000 @ $0 · Gift (G): 10,000 @ $0 | EDGAR |
| 2025-06-06 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 4,060 @ $13.35 | EDGAR |
| 2025-03-07 | 4 | Dyne Therapeutics, Inc. (DYN) | Sale (S): 4,061 @ $11.83 | EDGAR |
| 2024-12-06 | 4 | Dyne Therapeutics, Inc. (DYN) | Grant/award (A): 145,300 @ $0 · Grant/award (A): 232,100 (derivative) @ $0 | EDGAR |
| 2024-09-04 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 800 @ $32.57 · Purchase (P): 7,200 @ $33.09 · Purchase (P): 800 @ $32.57 · Purchase (P): 7,200 @ $33.09 · Purchase (P): 800 @ $32.57 · Purchase (P): 7,200 @ $33.09 · +2 more | EDGAR |
| 2024-03-27 | 4 | Dyne Therapeutics, Inc. (DYN) | Grant/award (A): 679,853 (derivative) @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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