Monitor for actual execution of these sales, as the coordinated filing by a major shareholder signals potential lack of confidence. This adds to recent insider selling pressure and could weigh on the stock.
Price Chart
Executive Summary
Three institutional investors affiliated with Atlas Venture—Atlas Venture Associates XI, L.P., Atlas Venture Fund XI, L.P., and Atlas Venture Opportunity Fund I, L.P.—filed Form 144s to sell up to 1,050,000 shares of Dyne Therapeutics (DYN) each, totaling 3.15 million shares. This represents a coordinated insider sale by a major shareholder group.
Key Facts
- Three affiliated funds of Atlas Venture each filed to sell up to 1,050,000 shares of DYN
- Total proposed sale is 3.15 million shares
- Atlas Venture is a major institutional shareholder
- Recent insider activity shows $13.4M in sells over the past 30 days
Financial Impact
3.15 million shares, approximately $30.5 million at current $9.70 stock price
Risk Factors
- Significant insider selling could pressure the stock price
- Perception of lack of confidence from a major institutional backer
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 6 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (DYN) — Batch item 1 | 0001628280-26-027252 |
| Document: 0001628280-26-027252-index.html | 0001628280-26-027253 |
| Document: 0001628280-26-027252.txt | 0001628280-26-027255 |
| 144 Filing (DYN) — Batch item 4 | 0001628280-26-027253 |
| Document: 0001628280-26-027253-index.html | 0001628280-26-027252 |
| 144 Filing (DYN) — Batch item 6 | 0001628280-26-027255 |
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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