The doubling of positions by two active managers suggests a catalyst thesis (e.g., Sphere venue ramp, new partnerships, or upcoming events). Monitor next earnings for revenue growth from the Las Vegas venue and any updates on international expansion plans.
Executive Summary
Three institutional asset managers significantly increased their SPHR positions in Q1 2026, with Artemis and Assenagon both doubling their stakes, while Robeco nearly exited. The cluster shows strong net buying conviction of $71.6M, suggesting a shared positive thesis on Sphere Entertainment's business trajectory.
Key Financial Metrics
Institutional Positions
Net institutional flow: $71.6M
▲ Buyers (3)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Artemis Investment Management | DOUBLED | +118.9% | $60.2M | $24.8M |
| Assenagon Asset Management | DOUBLED | +114.2% | $117.2M | $46.8M |
| Assetmark | ADD | +29.4% | $3.0K | $16.00 |
▼ Sellers (1)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Robeco Institutional Asset Management B.v. | NEAR_EXIT | -91.6% | $7.8M | -$7.3M |
Key Facts
- 3 institutions accumulated $177.4M in SPHR positions, net adding $71.6M
- Artemis Investment Management doubled its stake (+118.9%) to $60.2M
- Assenagon Asset Management doubled its stake (+114.2%) to $117.2M
- Robeco Institutional Asset Management nearly exited (-91.6%), selling $7.3M
- All three buyers are active asset managers, not passive/index funds
Financial Impact
3 active asset managers accumulated $71.6M in net new SPHR positions during Q1 2026, while 1 manager reduced by $7.3M. Total buying value was $71.6M vs selling value of $7.3M.
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end
- Only 4 institutions in cluster — small sample size limits signal strength
- No insider buying corroboration to confirm institutional conviction
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-SPHR-2026-Q3 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 22, 2026 4d ago | SC 13D/A | $108.94 $110.44 | ▲ +1.38% | ▲ +0.67% | — |
Oct 21, 2026 5d ago | Institutional Cluster | $111.61 $108.94 | ▼ −2.39% | ▼ −1.87% | — |
May 5, 2026 25w ago | 8-K | $136.60 $143.95 | ▲ +5.38% | ▲ +4.00% | — |
US Market Status
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