🕵️ DYNE Therapeutics, Inc. ($DYN)
SEC insider & ownership activity, last 12 months · CIK 1818794 · every row links its SEC filing
Over the last 12 months insiders sold $168.6M against $275K of open-market buying. Jason P. Rhodes sold $129.1M through a 10b5-1 trading plan in 79 lots (Apr–Aug). 1 planned sale is pending, the largest $122K (Kerr Douglas). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $275K (7 lots) · 6 sellers, $168.6M (122 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Jason P. Rhodes | 0 | – | 79 | $129.1M | Aug 14, 2026 |
| Kersten Dirk | 0 | – | 19 | $38.6M | Jul 27, 2026 |
| Cox John | 0 | – | 6 | $444K | Sep 8, 2026 |
| Brian S. Posner | 7 | $275K | 0 | – | Jun 8, 2026 |
| Kerr Douglas | 0 | – | 7 | $233K | Sep 8, 2026 |
| Lucera Erick | 0 | – | 4 | $229K | Aug 13, 2026 |
| Friedl-Naderer Johanna | 0 | – | 7 | $43K | Sep 8, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| T. ROWE Price Investment Management, Inc. | 18.7% | 13G | May 15, 2026 | filing ↗ | |
| Janus Henderson Group Ltd. | 7.3% | 13G | Aug 13, 2026 | filing ↗ | |
| BlackRock, Inc. | 7.0% | 13G | Jul 28, 2026 | filing ↗ | |
| FMR LLC | 6.8% | 13G | Aug 6, 2026 | filing ↗ | |
| Abigail P. Johnson | 6.8% | 13G | Aug 6, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Cox John | $107K | Sep 8, 2026 | filing ↗ |
| Kerr Douglas | $661 | Sep 8, 2026 | filing ↗ |
| Kerr Douglas | $122K | Sep 4, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $8.4M | Aug 14, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $35.3M | Aug 14, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $12.4M | Aug 14, 2026 | filing ↗ |
| Cox John | $131K | Aug 13, 2026 | filing ↗ |
| Lucera Erick | $47K | Aug 13, 2026 | filing ↗ |
| Kerr Douglas | $64K | Aug 13, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $2.5M | Aug 13, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $7.0M | Aug 13, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $1.7M | Aug 13, 2026 | filing ↗ |
| ForDyne B.v. | $6.7M | Jul 27, 2026 | filing ↗ |
| Atlas Venture Associates XI, L.P. | $114K | Jul 7, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $1.4M | Jul 7, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $3.5M | Jul 7, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $1.8M | Jul 7, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $2.3M | Jul 6, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $5.8M | Jul 6, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $2.9M | Jul 6, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $1.1M | Jun 29, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $2.2M | Jun 29, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $852K | Jun 29, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $1.7M | Jun 26, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $3.4M | Jun 26, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $1.3M | Jun 26, 2026 | filing ↗ |
| Lucera Erick | $48K | Jun 25, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $130K | Jun 25, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $102K | Jun 25, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $258K | Jun 25, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $515K | Jun 24, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $405K | Jun 24, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $1.0M | Jun 24, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $642K | Jun 23, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $817K | Jun 23, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $1.6M | Jun 22, 2026 | filing ↗ |
| ForDyne B.v. | $6.4M | Jun 17, 2026 | filing ↗ |
| Cox John | $49K | Jun 16, 2026 | filing ↗ |
| Cox John | $61K | May 13, 2026 | filing ↗ |
| Lucera Erick | $27K | May 13, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $762K | May 6, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $383K | May 6, 2026 | filing ↗ |
| Atlas Venture Associates XI, LP | $7K | May 6, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $301K | May 6, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $108K | May 5, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund II, LP | $54K | May 5, 2026 | filing ↗ |
| Atlas Venture Associates XI, LP | $1K | May 5, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $43K | May 5, 2026 | filing ↗ |
| Atlas Venture Opportunity Fund I, LP | $43K | May 4, 2026 | filing ↗ |
| Atlas Venture Fund XI, LP | $109K | May 4, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Jul 29, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 29, 2026 | filing ↗ |
| Material agreement (1.01) | Jul 21, 2026 | filing ↗ |
| Other events (8.01) | Jul 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 21, 2026 | filing ↗ |
| Other events (8.01) | Jul 20, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 22, 2026 | filing ↗ |
| Material agreement (1.01) | Jun 16, 2026 | filing ↗ |
| New financial obligation (2.03) | Jun 16, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jun 3, 2026 | filing ↗ |
| Other events (8.01) | Jun 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 3, 2026 | filing ↗ |
| Earnings (2.02) | May 11, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 11, 2026 | filing ↗ |
| Earnings (2.02) | Mar 2, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 2, 2026 | filing ↗ |
| Earnings (2.02) | Jan 12, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 12, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 22, 2025 | filing ↗ |
| Material agreement (1.01) | Dec 9, 2025 | filing ↗ |
| Other events (8.01) | Dec 9, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 9, 2025 | filing ↗ |
| New financial obligation (2.03) | Dec 8, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 8, 2025 | filing ↗ |
| Other events (8.01) | Dec 8, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 8, 2025 | filing ↗ |
| Earnings (2.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |