This is a routine, small-dollar insider sale by a director following RSU vesting. No material signal for traders. Monitor for any larger insider sales ahead of upcoming clinical catalysts or earnings.
Price Chart
Executive Summary
Director John Cox filed a Form 144 notice of intent to sell 3,311 shares of Dyne Therapeutics common stock, valued at approximately $60,805 based on the filing date. This is a small, routine sale by a director, representing a negligible fraction of the company's $3.0B market cap, and is not indicative of material insider concern.
Key Facts
- Director John Cox filed Form 144 to sell 3,311 shares of DYN common stock.
- Estimated sale value: ~$60,805 based on filing date.
- Shares are from restricted stock units that vested on 05/12/2026.
- Sale represents a tiny fraction of DYN's $3.0B market cap.
- Recent insider activity (30d): 9 sells totaling $5.0M, indicating some ongoing insider selling but not unusual for a biotech.
Financial Impact
~$60,805 sale by a director, immaterial relative to $3.0B market cap
Risk Factors
- Insider selling pattern may increase if more directors file 144s ahead of data readouts.
- Biotech sector risk: any negative clinical data could amplify insider selling concerns.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001972481-26-000156 |
| Document: 0001972481-26-000156-index.html | 0001972481-26-000156 |
| Document: 0001972481-26-000156.txt | 0001972481-26-000156 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 17, 2026 6w ago | Insider Cluster | $26.15 $17.90 | ▲ +31.55% | ▲ +29.57% | $15.20 (+41.87%) |
Aug 14, 2026 6w ago | 144 | $26.15 $18.52 | ▼ −29.18% | ▼ −27.65% | $15.20 (−41.87%) |
Aug 13, 2026 7w ago | 144 | $25.70 $18.52 | ▲ +27.94% | ▲ +25.95% | $15.20 (+40.86%) |
Aug 13, 2026 7w ago | 144 | $25.70 $18.52 | ▼ −27.94% | ▼ −25.95% | $15.20 (−40.86%) |
Aug 13, 2026 7w ago | 144 | $25.70 $18.52 | ▼ −27.94% | ▼ −25.95% | $15.20 (−40.86%) |
Jul 29, 2026 9w ago | Press Release | $25.73 $26.09 | ▲ +1.40% | ▼ −2.57% | $15.20 (−40.92%) |
Jul 22, 2026 10w ago | Press Release | $23.21 $26.78 | ▼ −15.38% | ▼ −12.48% | $15.20 (+34.51%) |
Jul 20, 2026 10w ago | 8-K | $23.45 $26.15 | ▲ +11.51% | ▲ +7.39% | $15.20 (−35.18%) |
Jun 30, 2026 13w ago | Insider Cluster | $21.79 $25.10 | ▲ +15.19% | ▲ +17.38% | $15.20 (−30.24%) |
Jun 29, 2026 13w ago | 144 | $22.21 $25.63 | ▼ −15.40% | ▼ −16.43% | $15.20 (+31.56%) |
US Market Status
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