The strong institutional accumulation (7 buyers, $73.2M net) is a positive signal, but the lack of insider buying and poor historical track record of bullish calls on ANAB (30% win rate, -9.30% avg T+20 return) warrant caution. Monitor for any insider open-market purchases or upcoming catalysts (e.g., pipeline data) that could confirm the institutional thesis. The 45-day 13F reporting lag means these positions may have already been adjusted.
Executive Summary
Seven institutional investors accumulated $73.2M in net new ANAB positions during Q2 2026, led by State Street (+$31.8M), First Trust Advisors (new $17.5M position), and Nuveen (+$10.9M). The cluster is dominated by active asset managers (5 of 7 funds), with no insider open-market buying to corroborate the signal. Historical calibration shows prior bullish reports on ANAB have underperformed (30% win rate at T+20, avg -9.30% return), suggesting caution despite the strong institutional accumulation.
Key Financial Metrics
Institutional Positions
Net institutional flow: $73.2M
▲ Buyers (7)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| State Street | ADD | +29.6% | $86.8M | $31.8M |
| First Trust Advisors | NEW | — | $17.5M | $17.5M |
| Nuveen | ADD | +33.1% | $28.4M | $10.9M |
| Victory Capital Management | ADD | +56.4% | $11.4M | $5.4M |
| JPMorgan | DOUBLED | +589% | $5.3M | $4.6M |
| Citigroup | ADD | +35% | $6.7M | $2.6M |
| Zurcher Kantonalbank | ADD | +39.6% | $905.0K | $372.0K |
Key Facts
- 7 institutional buyers with $157.0M in aggregate current holdings, net adding $73.2M
- No institutional sellers in the cluster
- First Trust Advisors initiated a new $17.5M position (259.0K shares)
- State Street added $31.8M, increasing its stake by 29.6%
- JPMorgan doubled its position (+589% shares, from $645K to $5.3M)
- No insider open-market buying in the same window (confluence score 36/100)
- Historical ANAB reports show 30% win rate at T+20 with avg -9.30% return
Financial Impact
7 institutional buyers accumulated $73.2M in net new positions, with aggregate current holdings of $157.0M
Risk Factors
- 45-day 13F reporting lag — positions may have been unwound since quarter-end
- No insider buying to corroborate institutional conviction
- Historical bullish calls on ANAB have underperformed significantly (avg -9.30% T+20)
- Cluster dominated by passive/index funds (State Street, JPMorgan) reduces signal strength
- Score calibration shows score-5 reports have only 48% observed probability of up-move at T+20
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-ANAB-2026-Q2 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 12, 2026 7w ago | Institutional Cluster | $56.02 $53.87 | ▼ −3.84% | ▼ −2.09% | — |
Jun 29, 2026 13w ago | 144 | $67.50 $53.61 | ▲ +20.58% | ▲ +19.55% | — |
Jun 29, 2026 13w ago | DEFA14A | $67.50 $53.61 | ▼ −20.58% | ▼ −19.55% | — |
Jun 26, 2026 13w ago | 144 | $65.97 $54.15 | ▲ +17.92% | ▲ +17.64% | — |
Jun 22, 2026 14w ago | 8-K | $59.43 $50.29 | ▼ −15.38% | ▼ −16.54% | — |
Jun 17, 2026 15w ago | 144 | $57.51 $54.15 | ▲ +5.84% | ▲ +6.38% | — |
Jun 15, 2026 15w ago | 144 | $57.61 $62.51 | ▼ −8.51% | ▼ −8.31% | — |
Jun 11, 2026 16w ago | 144 | $56.07 $66.39 | ▼ −18.41% | ▼ −16.63% | — |
Jun 10, 2026 16w ago | 144 | $54.24 $66.59 | ▼ −22.77% | ▼ −20.88% | — |
Jun 8, 2026 16w ago | 144 | $51.63 $67.33 | ▼ −30.40% | ▼ −28.95% | — |
US Market Status
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