The Ninety One UK position is the dominant signal — a near-wholesale new $61.7M stake from a single active manager. Monitor next 13F filing for whether this position was maintained or reversed, and watch for any insider buying (Form 4) to corroborate the thesis.
Executive Summary
Three institutional asset managers accumulated $64.9M in NBIX during Q3 2026, led by Ninety One UK nearly doubling its stake to $61.7M, while Assenagon Asset Management trimmed $16.8M. The cluster shows strong active-manager conviction, but the 45-day reporting lag and mixed historical signal accuracy temper the read.
Key Financial Metrics
Institutional Positions
Net institutional flow: $48.1M
▲ Buyers (3)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Ninety One Uk | DOUBLED | +160372.7% | $61.7M | $61.6M |
| Congress Asset Management | ADD | +46.5% | $17.1M | $3.2M |
| Farther Finance Advisors | ADD | +37.4% | $488.0K | $65.0K |
▼ Sellers (1)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | TRIM | -34.5% | $37.5M | -$16.8M |
Key Facts
- 3 buyers added $64.9M in net new positions; 1 seller reduced by $16.8M
- Ninety One UK increased its stake by 160,373% (271 → 434.9K shares, value $46K → $61.7M)
- Congress Asset Management added 46.5% (82.5K → 120.8K shares, value +$3.2M)
- Assenagon Asset Management trimmed 34.5% (222.6K → 145.8K shares, value -$16.8M)
- All four funds are active asset managers; no passive/index funds in the cluster
Financial Impact
3 institutions accumulated $64.9M in new positions while 1 reduced holdings by $16.8M, net institutional inflow of $48.1M
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end
- Single large buyer (Ninety One UK) dominates the cluster; cluster signal is not diversified across many funds
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-NBIX-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 15, 2026 12d ago | SC 13G/A | $136.95 | awaiting T+60 | — | — |
Oct 15, 2026 12d ago | Institutional Cluster | $136.95 | awaiting T+60 | — | — |
Oct 7, 2026 19d ago | 3 | $141.25 | awaiting T+60 | — | — |
Sep 15, 2026 6w ago | Insider Cluster | $149.50 | awaiting T+60 | — | — |
Jul 13, 2026 15w ago | Insider Cluster | $172.04 $143.47 | ▼ −16.61% | ▼ −19.98% | — |
Jul 9, 2026 15w ago | Press Release | $177.11 $144.21 | ▼ −18.58% | ▼ −21.21% | — |
Jun 9, 2026 20w ago | Insider Cluster | $160.86 $158.35 | ▼ −1.56% | ▼ −8.14% | — |
Jun 8, 2026 20w ago | Insider Cluster | $165.24 $157.79 | ▼ −4.51% | ▼ −8.32% | — |
Jun 8, 2026 20w ago | Insider Cluster | $165.24 $157.79 | ▼ −4.51% | ▼ −8.32% | — |
Jun 4, 2026 20w ago | Insider Cluster | $163.88 $153.44 | ▼ −6.37% | ▼ −10.37% | — |
US Market Status
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