The cluster is entirely active asset managers adding to BLK, with no sellers — a clean directional signal. The Q3 earnings strength (record AUM, 19% revenue growth) likely drove the thesis. Monitor Q4 2026 13F filings for continuation or reversal of this accumulation pattern.
Executive Summary
Four institutional asset managers increased their BlackRock holdings in Q3 2026, adding a net $81.4M in value. The accumulation follows BlackRock's strong Q3 earnings report (record AUM of $15.5T, 19% revenue growth, 38% EPS growth), suggesting these managers are positioning for continued organic growth and capital return.
Key Financial Metrics
Institutional Positions
Net institutional flow: $81.4M
▲ Buyers (4)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | ADD | +29.7% | $238.9M | $71.5M |
| Robeco Institutional Asset Management B.v. | ADD | +38.8% | $13.4M | $4.6M |
| Mather Group | ADD | +47.3% | $8.3M | $3.2M |
| Farther Finance Advisors | ADD | +34.8% | $6.3M | $2.0M |
Key Facts
- 4 institutional asset managers added to BLK positions in Q3 2026, with aggregate current holdings of $266.8M
- Net buying totaled $81.4M across 4 funds; no institutional sellers in the cluster
- Assenagon Asset Management led with a $71.5M increase (+29.7% shares), now holding $238.9M
- BlackRock reported Q3 2026 adjusted EPS of $15.93 (+38% YoY) and record AUM of $15.5T
- All buyers are active asset managers, not passive/index funds, strengthening the signal
Financial Impact
4 institutions accumulated $81.4M in net new BLK positions during Q3 2026, with total holdings reaching $266.8M
Risk Factors
- 13F data is 45+ days stale; positions may have been reduced since quarter-end
- All buyers are relatively small asset managers; no mega-funds or activist investors in the cluster
- BlackRock's high valuation may limit further upside despite strong fundamentals
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-BLK-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 today | Press Release | $1,127.66 | awaiting T+20 | — | — |
Oct 20, 2026 6d ago | Institutional Cluster | $1,149.60 | awaiting T+20 | — | — |
Oct 20, 2026 6d ago | ANALYST-UPGRADE | $1,128.68 | awaiting T+20 | — | — |
Oct 14, 2026 12d ago | 8-K | $1,073.79 | awaiting T+20 | — | — |
Oct 2, 2026 24d ago | ANALYST-UPGRADE | $1,059.63 | awaiting T+20 | — | — |
Sep 23, 2026 4w ago | Press Release | $1,073.45 $1,137.29 | ▲ +5.95% | ▲ +6.37% | — |
Aug 26, 2026 8w ago | 3 | $1,167.57 $1,073.45 | ▼ −8.06% | ▼ −7.55% | — |
Aug 25, 2026 8w ago | Press Release | $1,173.21 $1,073.45 | ▼ −8.50% | ▼ −8.65% | — |
Aug 19, 2026 9w ago | Press Release | $1,158.92 $1,053.96 | ▼ −9.06% | ▼ −7.11% | — |
Aug 11, 2026 10w ago | Institutional Cluster | $1,148.84 $1,072.03 | ▼ −6.69% | ▼ −5.63% | — |
US Market Status
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