Cox John
SEC insider (Form 3/4/5 filer). CIK 0001498428. CEO & President at Dyne Therapeutics, Inc. (DYN). 25 reported Form 4/5 transactions since Sep 2024; latest on Sep 8, 2026. Located in WALTHAM, MA.
Companies Cox John has filed insider reports for
- Dyne Therapeutics, Inc. (DYN): Director, Officer, CEO & President
Cox John
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.
SaleDirect5.7K shares at avg. $18.88$107K - Aug 13, 2026DYN
Dyne Therapeutics, Inc.
SaleDirect5K shares at avg. $26.28$131K - Jun 16, 2026DYN
Dyne Therapeutics, Inc.
SaleDirect2.7K shares at avg. $18.33$49K - May 13, 2026DYN
Dyne Therapeutics, Inc.
SaleDirect3.3K shares at avg. $18.36$61K - Mar 5, 2026DYN
Dyne Therapeutics, Inc.
SaleDirect2.7K shares at avg. $14.90$41K - Feb 12, 2026DYN
Dyne Therapeutics, Inc.
AwardDirect180K shares- - Dec 5, 2025DYN
Dyne Therapeutics, Inc.
SaleDirect2.7K shares at avg. $20.72$55K - Sep 5, 2025DYN
Dyne Therapeutics, Inc.
SaleDirect2.6K shares at avg. $13.41$35K - Jul 16, 2025DYN
Dyne Therapeutics, Inc.
AwardDirectStock option (right to buy)
197.3K shares- - Jul 15, 2025DYN
Dyne Therapeutics, Inc.
GiftDirect10K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 8, 2026 | DYN Dyne Therapeutics, Inc. | Sale | 5,658 | $18.88 | $106,823 | Direct |
| Aug 13, 2026 | DYN Dyne Therapeutics, Inc. | Sale | 4,986 | $26.28 | $131,032 | Direct |
| Jun 16, 2026 | DYN Dyne Therapeutics, Inc. | Sale | 2,683 | $18.33 | $49,179 | Direct |
| May 13, 2026 | DYN Dyne Therapeutics, Inc. | Sale | 3,311 | $18.36 | $60,790 | Direct |
| Mar 5, 2026 | DYN Dyne Therapeutics, Inc. | Sale | 2,732 | $14.90 | $40,707 | Direct |
| Feb 12, 2026 | DYN Dyne Therapeutics, Inc. | Award | 180,000 | - | $0 | Direct |
| Dec 5, 2025 | DYN Dyne Therapeutics, Inc. | Sale | 2,662 | $20.72 | $55,157 | Direct |
| Sep 5, 2025 | DYN Dyne Therapeutics, Inc. | Sale | 2,640 | $13.41 | $35,402 | Direct |
| Jul 16, 2025 | DYN Dyne Therapeutics, Inc. | Award Stock option (right to buy) | 197,285 | - | - | Direct |
| Jul 15, 2025 | DYN Dyne Therapeutics, Inc. | Gift | 10,000 | - | - | Direct |
1-10 of 25 transactions