Dyne Therapeutics, Inc. (DYN) Insider Trading
Over the last 3 months, DYN insiders made 2 open-market buys and 46 sales, a net sale of -$113.5M (SEC Form 4). Over the last 6 months, 189 institutions increased and 140 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
2
Sells (3m)
46
Net (3m)
-$113.5M
Insiders buying
Insider trades by month Buys Sells
Mar
Apr
May
Jun
Jul
Aug
Context3-month price +33.3%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 17, 2026 | Lucera Erickofficer: Chief Financial Officer | Sell | 1,797 | $26.28 |
| Aug 17, 2026 | Rhodes Jason Pdirector | Sell | 94,415 | $26.20 |
| Aug 17, 2026 | Rhodes Jason Pdirector | Sell | 1,359,674 | $25.00 |
| Aug 17, 2026 | Rhodes Jason Pdirector | Sell | 322,465 | $25.00 |
| Aug 17, 2026 | Rhodes Jason Pdirector | Sell | 478,377 | $25.00 |
| Aug 17, 2026 | Friedl-Naderer Johannaofficer: Chief Commercial Officer | Sell | 226 | $26.28 |
| Aug 17, 2026 | Rhodes Jason Pdirector | Sell | 63,643 | $26.20 |
| Aug 17, 2026 | Kerr Douglasofficer: Chief Medical Officer | Sell | 1,556 | $26.28 |
| Aug 17, 2026 | Cox Johndirector, officer: CEO & President | Sell | 4,986 | $26.28 |
| Aug 17, 2026 | Rhodes Jason Pdirector | Sell | 268,354 | $26.20 |
| Jul 29, 2026 | Kersten Dirkdirector | Sell | 5,388 | $26.04 |
| Jul 29, 2026 | Kersten Dirkdirector | Sell | 256,072 | $25.50 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 253,039 | $22.79 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 29,587 | $23.62 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 127,182 | $22.79 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 49,193 | $23.17 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 11,665 | $23.62 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 14,844 | $23.62 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 124,379 | $23.17 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 5,000 | $23.61 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 62,543 | $23.17 |
| Jul 8, 2026 | Rhodes Jason Pdirector | Sell | 100,019 | $22.79 |
| Jun 30, 2026 | Rhodes Jason Pdirector | Sell | 51,756 | $21.14 |
| Jun 30, 2026 | Rhodes Jason Pdirector | Sell | 162,954 | $21.28 |
| Jun 30, 2026 | Rhodes Jason Pdirector | Sell | 40,702 | $21.14 |
| Jun 30, 2026 | Rhodes Jason Pdirector | Sell | 64,411 | $21.28 |
| Jun 30, 2026 | Rhodes Jason Pdirector | Sell | 81,903 | $21.28 |
| Jun 30, 2026 | Rhodes Jason Pdirector | Sell | 102,969 | $21.14 |
| Jun 26, 2026 | Rhodes Jason Pdirector | Sell | 5,019 | $21.10 |
| Jun 26, 2026 | Rhodes Jason Pdirector | Sell | 6,382 | $21.10 |
Source: DYN SEC Form 4 filings, latest Aug 17, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their DYN positions over the last 6 months (SEC Form 13F).
Increased
189
New positions
92
Reduced
140
Sold out
30
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | Increased | 30.9M | Aug 14, 2026 |
| T. ROWE PRICE INVESTMENT MANAGEMENT, INC. | Increased | 30.8M | May 15, 2026 |
| JANUS HENDERSON GROUP PLC | Reduced | 13.6M | May 18, 2026 |
| BlackRock, Inc. | Increased | 12.4M | Aug 7, 2026 |
| Jupiter Topco LLC | New Position | 12.0M | Aug 14, 2026 |
| BLACKROCK, INC. | Increased | 11.7M | May 13, 2026 |
| FMR LLC | Increased | 11.2M | Aug 13, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 9.1M | May 14, 2026 |
| FMR LLC | Increased | 8.9M | May 15, 2026 |
| STATE STREET CORP | Increased | 7.5M | Aug 7, 2026 |
| Orbis Allan Gray Ltd | Increased | 7.0M | Aug 14, 2026 |
| Atlas Venture Life Science Advisors, LLC | Reduced | 6.8M | Aug 13, 2026 |
| ORBIS ALLAN GRAY LTD | Increased | 6.8M | May 15, 2026 |
| STATE STREET CORP | Reduced | 6.7M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 6.4M | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.