The cluster is small in dollar terms ($15M vs $37.2B market cap) but directionally bullish with 100% buyer participation. Monitor for additional 13F filings from other large holders to confirm the trend. The lack of insider buying and the 45-day reporting lag mean the cluster may already be stale — watch for Q3 2026 13F data for persistence.
Executive Summary
Four institutional asset managers increased their ALNY positions in Q2 2026, led by Robeco Institutional Asset Management adding $14.8M (+48.7%). Total net buying of $15.0M across 4 funds with zero sellers. The cluster is dominated by active managers, not passive index rebalancing, which strengthens the signal. However, the aggregate dollar amount is modest relative to ALNY's $37.2B market cap, and insider activity is divergent (no open-market buying), tempering conviction.
Key Financial Metrics
Institutional Positions
Net institutional flow: $15.0M
▲ Buyers (4)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Robeco Institutional Asset Management B.v. | ADD | +48.7% | $56.6M | $14.8M |
| Gateway Investment Advisers | ADD | +28.8% | $873.0K | $128.0K |
| Farther Finance Advisors | ADD | +25.9% | $345.0K | $46.0K |
| Mather Group | DOUBLED | +136.4% | $8.0K | $4.0K |
Key Facts
- 4 institutional buyers added $15.0M in net new ALNY positions in Q2 2026
- Robeco Institutional Asset Management was the largest buyer, adding $14.8M (+48.7%)
- Zero institutional sellers in the cluster
- All 4 buyers are active asset managers — no passive/index fund rebalancing
- Insider activity is divergent (score 13/100) with no open-market insider buying
Financial Impact
4 institutions accumulated $15.0M in net new ALNY positions, with Robeco alone adding $14.8M
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound
- Insider divergence (no open-market buying) reduces conviction
- Small cluster size ($15M) relative to $37.2B market cap limits signal strength
Market Snapshot
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-ALNY-2026-Q2 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 17, 2026 6w ago | Court Ruling | $224.60 $238.27 | ▲ +6.09% | ▲ +8.06% | — |
Jul 30, 2026 9w ago | 8-K | $205.48 $236.56 | ▼ −15.13% | ▼ −11.16% | — |
Jul 29, 2026 9w ago | Institutional Cluster | $286.62 $239.00 | ▼ −16.61% | ▼ −21.63% | — |
Mar 3, 2026 30w ago | Insider Cluster | $318.65 $330.87 | ▲ +3.83% | ▲ +8.24% | — |
Mar 3, 2026 30w ago | Insider Cluster | $318.65 $330.87 | ▲ +3.83% | ▲ +8.24% | — |
Feb 28, 2026 30w ago | Institutional Cluster | $325.07 $316.09 | ▼ −2.76% | ▲ +5.18% | — |
US Market Status
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