Dyne Therapeutics, Inc. (DYN) Insider Trading
Over the last 3 months, DYN insiders made 4 open-market buys and 65 sales, a net sale of -$54.5M (SEC Form 4). Over the last 6 months, 211 institutions increased and 116 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
4
Sells (3m)
65
Net (3m)
-$54.5M
Insiders buying
Insider trades by month Buys Sells
Jul
Sep
Dec
Mar
Apr
May
Context3-month price +21.1%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| May 28, 2026 | Posner Brian Sdirector | Buy | 2,000 | $18.21 |
| May 22, 2026 | Posner Brian Sdirector | Buy | 2,500 | $17.12 |
| May 14, 2026 | Kerr Douglasofficer: Chief Medical Officer | Sell | 1,564 | $18.36 |
| May 14, 2026 | Cox Johndirector, officer: CEO & President | Sell | 3,311 | $18.36 |
| May 14, 2026 | Friedl-Naderer Johannaofficer: Chief Commercial Officer | Sell | 228 | $18.36 |
| May 14, 2026 | Lucera Erickofficer: Chief Financial Officer | Sell | 1,448 | $18.36 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 6,081 | $18.03 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 61 | $18.00 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 21,926 | $18.18 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 60 | $18.03 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 2,466 | $18.00 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 2,403 | $18.03 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 6,241 | $18.00 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 428 | $18.18 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 43,621 | $18.18 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 3,136 | $18.00 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 17,244 | $18.18 |
| May 6, 2026 | Rhodes Jason Pdirector | Sell | 3,056 | $18.03 |
| Apr 30, 2026 | Rhodes Jason Pdirector | Sell | 119,115 | $18.38 |
| Apr 30, 2026 | Rhodes Jason Pdirector | Sell | 47,082 | $18.38 |
| Apr 30, 2026 | Rhodes Jason Pdirector | Sell | 1,170 | $18.38 |
| Apr 30, 2026 | Rhodes Jason Pdirector | Sell | 1 | $19.00 |
| Apr 30, 2026 | Rhodes Jason Pdirector | Sell | 21 | $19.00 |
| Apr 30, 2026 | Rhodes Jason Pdirector | Sell | 59,870 | $18.38 |
| Apr 30, 2026 | Rhodes Jason Pdirector | Sell | 52 | $19.00 |
| Apr 30, 2026 | Rhodes Jason Pdirector | Sell | 26 | $19.00 |
| Apr 27, 2026 | Rhodes Jason Pdirector | Sell | 19,261 | $19.19 |
| Apr 27, 2026 | Rhodes Jason Pdirector | Sell | 28,583 | $18.48 |
| Apr 27, 2026 | Rhodes Jason Pdirector | Sell | 38,322 | $19.19 |
| Apr 27, 2026 | Rhodes Jason Pdirector | Sell | 45,709 | $18.15 |
Source: DYN SEC Form 4 filings, latest May 28, 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
211
New positions
88
Reduced
116
Sold out
71
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| T. ROWE PRICE INVESTMENT MANAGEMENT, INC. | Increased | 30.8M | May 15, 2026 |
| T. ROWE PRICE INVESTMENT MANAGEMENT, INC. | Increased | 17.5M | Feb 19, 2026 |
| JANUS HENDERSON GROUP PLC | Reduced | 13.9M | Feb 17, 2026 |
| JANUS HENDERSON GROUP PLC | Reduced | 13.6M | May 18, 2026 |
| BLACKROCK, INC. | Increased | 11.7M | May 13, 2026 |
| VANGUARD GROUP INC | Increased | 11.2M | Jan 29, 2026 |
| BLACKROCK, INC. | Increased | 11.2M | Feb 12, 2026 |
| PERCEPTIVE ADVISORS LLC | Increased | 9.3M | May 29, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 9.1M | Feb 13, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 9.1M | May 14, 2026 |
| FMR LLC | Increased | 8.9M | May 15, 2026 |
| ORBIS ALLAN GRAY LTD | Increased | 6.8M | May 15, 2026 |
| STATE STREET CORP | Increased | 6.7M | Feb 13, 2026 |
| STATE STREET CORP | Reduced | 6.7M | May 15, 2026 |
| FMR LLC | Increased | 6.6M | Feb 17, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.