The entry of Norges Bank — a sovereign investor with long-term horizon — combined with Wells Fargo doubling its stake, suggests growing conviction in Alnylam's valuation or pipeline. Traders should monitor for follow-on buys and upcoming clinical or regulatory catalysts.
Executive Summary
Three major institutions, including sovereign wealth fund Norges Bank, accumulated $1.06B in new positions in Alnylam Pharmaceuticals during Q4 2025, while BofA trimmed its stake by over half, reducing its position by $502.4M. The cluster shows strong net buying, led by a new $895.8M position from Norges Bank, signaling renewed institutional confidence despite one large passive seller.
Key Financial Metrics
Institutional Positions
Net institutional flow: $560.6M
▲ Buyers (3)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Norges Bank | NEW | +0% | $895.8M | $895.8M |
| Morgan Stanley | ADD | +33.6% | $385.8M | $54.7M |
| Wells Fargo | DOUBLED | +108.8% | $249.6M | $112.5M |
▼ Sellers (1)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| BofA | TRIM | -59.7% | $774.8M | -$502.4M |
Key Facts
- Norges Bank established a new $895.8M position in ALNY, the largest single buyer in the cluster.
- Morgan Stanley increased its stake by 33.6% ($54.7M net addition), and Wells Fargo doubled its position (+108.8%, $112.5M net addition).
- BofA significantly trimmed its holding by 59.7%, exiting $502.4M in value.
- Net institutional inflow of $557.6M ($1.53B total holdings, $1.06B in net buying vs $502.4M in selling).
Financial Impact
3 institutions accumulated $1.06B in new positions while 1 reduced holdings by $502.4M, resulting in a net $557.6M institutional inflow.
Risk Factors
- BofA's large trim may indicate profit-taking or risk-off behavior among some large passives.
- The cluster is dominated by passive managers; only Norges Bank is an active sovereign investor, which may limit the strength of the signal.
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-2025-Q4 |
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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