John Cox
CIK: 0001498428
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
Dyne Therapeutics, Inc.
Discretionary Trading P&L
Holdings
Transaction History (25 total)
- Sep 8, 2026DYN
Dyne Therapeutics, Inc.
Sale(S)Direct5.7K shares at avg. $18.88$107K - Aug 13, 2026DYN
Dyne Therapeutics, Inc.
Sale(S)Direct5K shares at avg. $26.28$131K - Jun 16, 2026DYN
Dyne Therapeutics, Inc.
Sale(S)Direct2.7K shares at avg. $18.33$49K - May 13, 2026DYN
Dyne Therapeutics, Inc.
Sale(S)Direct3.3K shares at avg. $18.36$61K - Mar 5, 2026DYN
Dyne Therapeutics, Inc.
Sale(S)Direct2.7K shares at avg. $14.90$41K - Feb 12, 2026DYN
Dyne Therapeutics, Inc.
Award(A)Direct180K shares- - Dec 5, 2025DYN
Dyne Therapeutics, Inc.
Sale(S)Direct2.7K shares at avg. $20.72$55K - Sep 5, 2025DYN
Dyne Therapeutics, Inc.
Sale(S)Direct2.6K shares at avg. $13.41$35K - Jul 16, 2025DYN
Dyne Therapeutics, Inc.
Award(A)DirectStock option (right to buy)
197.3K shares- - Jul 15, 2025DYN
Dyne Therapeutics, Inc.
Gift(G)Direct10K shares- - Jul 15, 2025DYN
Dyne Therapeutics, Inc.
Gift(G)Direct10K shares- - Jul 15, 2025DYN
Dyne Therapeutics, Inc.
Gift(G)Direct10K shares- - Jul 15, 2025DYN
Dyne Therapeutics, Inc.
Gift(G)Direct10K shares- - Jul 14, 2025DYN
Dyne Therapeutics, Inc.
Purchase(P)Direct100K shares at avg. $9.11$911K - Jun 5, 2025DYN
Dyne Therapeutics, Inc.
Sale(S)Direct4.1K shares at avg. $13.35$54K - Mar 5, 2025DYN
Dyne Therapeutics, Inc.
Sale(S)Direct4.1K shares at avg. $11.83$48K - Dec 4, 2024DYN
Dyne Therapeutics, Inc.
Award(A)Direct145.3K shares- - Sep 4, 2024DYN
Dyne Therapeutics, Inc.
Purchase(P)Indirect800 shares at avg. $32.57$26K - Sep 4, 2024DYN
Dyne Therapeutics, Inc.
Purchase(P)Indirect800 shares at avg. $32.57$26K - Sep 4, 2024DYN
Dyne Therapeutics, Inc.
Purchase(P)Indirect7.2K shares at avg. $33.09$238K - Sep 4, 2024DYN
Dyne Therapeutics, Inc.
Purchase(P)Indirect800 shares at avg. $32.57$26K - Sep 4, 2024DYN
Dyne Therapeutics, Inc.
Purchase(P)Indirect7.2K shares at avg. $33.09$238K - Sep 4, 2024DYN
Dyne Therapeutics, Inc.
Purchase(P)Indirect800 shares at avg. $32.57$26K - Sep 4, 2024DYN
Dyne Therapeutics, Inc.
Purchase(P)Indirect7.2K shares at avg. $33.09$238K - Sep 4, 2024DYN
Dyne Therapeutics, Inc.
Purchase(P)Indirect7.2K shares at avg. $33.09$238K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 8, 2026 | DYN Dyne Therapeutics, Inc. | Sale(S) | 5,658 | $18.88 | $106,823 | Direct |
| Aug 13, 2026 | DYN Dyne Therapeutics, Inc. | Sale(S) | 4,986 | $26.28 | $131,032 | Direct |
| Jun 16, 2026 | DYN Dyne Therapeutics, Inc. | Sale(S) | 2,683 | $18.33 | $49,179 | Direct |
| May 13, 2026 | DYN Dyne Therapeutics, Inc. | Sale(S) | 3,311 | $18.36 | $60,790 | Direct |
| Mar 5, 2026 | DYN Dyne Therapeutics, Inc. | Sale(S) | 2,732 | $14.90 | $40,707 | Direct |
| Feb 12, 2026 | DYN Dyne Therapeutics, Inc. | Award(A) | 180,000 | - | $0 | Direct |
| Dec 5, 2025 | DYN Dyne Therapeutics, Inc. | Sale(S) | 2,662 | $20.72 | $55,157 | Direct |
| Sep 5, 2025 | DYN Dyne Therapeutics, Inc. | Sale(S) | 2,640 | $13.41 | $35,402 | Direct |
| Jul 16, 2025 | DYN Dyne Therapeutics, Inc. | Award(A) Stock option (right to buy) | 197,285 | - | - | Direct |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | Gift(G) | 10,000 | - | - | Direct |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | Gift(G) | 10,000 | - | - | Direct |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | Gift(G) | 10,000 | - | - | Direct |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | Gift(G) | 10,000 | - | - | Direct |
| Jul 14, 2025 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 100,000 | $9.11 | $911,000 | Direct |
| Jun 5, 2025 | DYN Dyne Therapeutics, Inc. | Sale(S) | 4,060 | $13.35 | $54,201 | Direct |
| Mar 5, 2025 | DYN Dyne Therapeutics, Inc. | Sale(S) | 4,061 | $11.83 | $48,042 | Direct |
| Dec 4, 2024 | DYN Dyne Therapeutics, Inc. | Award(A) | 145,300 | - | $0 | Direct |
| Sep 4, 2024 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 800 | $32.57 | $26,056 | Indirect |
| Sep 4, 2024 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 800 | $32.57 | $26,056 | Indirect |
| Sep 4, 2024 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 7,200 | $33.09 | $238,248 | Indirect |
| Sep 4, 2024 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 800 | $32.57 | $26,056 | Indirect |
| Sep 4, 2024 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 7,200 | $33.09 | $238,248 | Indirect |
| Sep 4, 2024 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 800 | $32.57 | $26,056 | Indirect |
| Sep 4, 2024 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 7,200 | $33.09 | $238,248 | Indirect |
| Sep 4, 2024 | DYN Dyne Therapeutics, Inc. | Purchase(P) | 7,200 | $33.09 | $238,248 | Indirect |
1-25 of 25 transactions
About Cox John
Cox John (SEC CIK 0001498428) files insider reports with the SEC as CEO & President of Dyne Therapeutics, Inc. (DYN).
Signal8 holds 14 ownership filings by Cox John, all Form 4s, filed between Sep 4, 2024 and Sep 8, 2026. Those filings report 25 transactions, from Sep 4, 2024 to Sep 8, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Cox John's filings is in WALTHAM, MA.
Recent filings by Cox John
- Sep 8, 2026: Open-market sale of DYN shares (Form 4, code S).
- Aug 13, 2026: Open-market sale of DYN shares (Form 4, code S).
- Jun 16, 2026: Open-market sale of DYN shares (Form 4, code S).
- May 13, 2026: Open-market sale of DYN shares (Form 4, code S).
- Mar 5, 2026: Open-market sale of DYN shares (Form 4, code S).
Other insiders filing for Dyne Therapeutics, Inc. (DYN)
- Kerr Douglas, Head of R&D and CMO
- Posner Brian S, Director
- Friedl-Naderer Johanna, Chief Commercial Officer
- Rhodes Jason P, Director
- Lucera Erick, Chief Financial Officer
- Kersten Dirk, Director