The cluster is dominated by mega-passive buyers (Fidelity, BofA, Goldman Sachs) whose adds may reflect index rebalancing or passive flows rather than fundamental conviction. However, active managers like Dimensional (doubled) and Millennium (doubled) provide a stronger signal. Watch for upcoming clinical data readouts or partnership announcements that could explain the divergence between large passive accumulators and active sellers like Adage and Squarepoint.
Executive Summary
Institutional activity in Dyne Therapeutics (DYN) during Q2 2026 was mixed but skewed bullish by dollar volume: 19 buyers added $168.3M in new positions (led by Fidelity, BofA, and Dimensional Fund Advisors), while 13 sellers reduced holdings by $40.5M (led by Adage Capital Partners and Squarepoint Ops). The net $127.8M inflow suggests institutional conviction in Dyne's muscle-targeting platform, though the 45-day reporting lag means positions may have shifted since quarter-end.
Key Financial Metrics
Institutional Positions
Net institutional flow: $127.8M
▲ Buyers (19)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Fidelity | ADD | +25.8% | $248.9M | $87.4M |
| Dimensional Fund Advisors | DOUBLED | +104.6% | $43.2M | $26.0M |
| BofA | ADD | +54.7% | $49.6M | $23.4M |
| Goldman Sachs | ADD | +25.2% | $47.9M | $16.7M |
| Millennium | DOUBLED | +172.4% | $9.6M | $6.7M |
▼ Sellers (13)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Adage Capital Partners Gp | NEAR_EXIT | -85% | $18.1M | -$14.8M |
| Squarepoint Ops | TRIM | -64% | $15.1M | -$8.5M |
| Fiera Capital | TRIM | -42.8% | $25.0M | -$7.5M |
| Nuveen | TRIM | -46.2% | $13.0M | -$4.4M |
| Ensign Peak Advisors | TRIM | -41.7% | $9.0M | -$2.6M |
Key Facts
- 19 institutional buyers added $168.3M in new DYN positions during Q2 2026
- 13 institutional sellers reduced DYN holdings by $40.5M during the same period
- Net institutional inflow of approximately $127.8M
- Fidelity was the largest buyer, adding $87.4M (25.8% increase to $248.9M)
- Adage Capital Partners was the largest seller, exiting 85% of its position (-$14.8M)
- Dimensional Fund Advisors doubled its position (+$26.0M to $43.2M)
- Renaissance Technologies trimmed 32.4% of its position (-$1.7M)
- Squarepoint Ops trimmed 64.0% of its position (-$8.5M)
Financial Impact
Net institutional inflow of $127.8M into DYN during Q2 2026, with $168.3M in buying activity partially offset by $40.5M in selling
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end
- Passive/index fund buying may not reflect fundamental conviction in Dyne's pipeline
- Significant selling by active managers (Adage -85%, Squarepoint -64%) suggests some sophisticated investors are reducing exposure
- Biotech sector volatility and binary clinical trial risk could reverse institutional sentiment
Investment Themes
Documents Analyzed
This report is based on 1 institutional 13F filing from SEC EDGAR.
| Document | Accession Number |
|---|---|
| INST-CLUSTER Data (Synthetic) | inst-cluster-DYN-2026-Q2 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 22, 2026 5d ago | Press Release | $15.62 | awaiting T+20 | — | — |
Oct 12, 2026 15d ago | Institutional Cluster | $15.96 | awaiting T+20 | — | — |
Sep 29, 2026 28d ago | Press Release | $16.11 | awaiting T+20 | — | — |
Sep 8, 2026 7w ago | Insider Cluster | $19.19 $15.97 | ▼ −16.78% | ▼ −18.72% | — |
Aug 17, 2026 10w ago | Insider Cluster | $26.00 $17.31 | ▲ +33.44% | ▲ +31.70% | — |
Aug 14, 2026 10w ago | 144 | $26.15 $18.52 | ▼ −29.18% | ▼ −27.65% | — |
Aug 13, 2026 10w ago | 144 | $25.70 $18.52 | ▲ +27.94% | ▲ +25.95% | — |
Aug 13, 2026 10w ago | 144 | $25.70 $18.52 | ▼ −27.94% | ▼ −25.95% | — |
Aug 13, 2026 10w ago | 144 | $25.70 $18.52 | ▼ −27.94% | ▼ −25.95% | — |
Jul 29, 2026 12w ago | Press Release | $25.73 $26.09 | ▲ +1.40% | ▼ −2.57% | — |
US Market Status
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