The heavy selling by Capital Group, Fidelity, and Morgan Stanley signals potential fundamental concerns or index rebalancing. However, active managers like Victory Capital and Balyasny are betting on a turnaround. Monitor Magnite's upcoming earnings for revenue growth and CTV ad demand; if fundamentals disappoint, further institutional selling could pressure the stock.
Executive Summary
In Q1 2026, institutional activity in Magnite (MGNI) showed a sharp divergence: 14 sellers reduced holdings by $238M while 20 buyers added $20.6M, resulting in net institutional outflow of ~$217M. The selling was dominated by mega-passive managers (Capital Group, Fidelity, Morgan Stanley), while active hedge funds (Victory Capital, Balyasny) increased positions. This suggests a loss of confidence among large index-oriented holders, partially offset by selective active conviction.
Key Financial Metrics
Institutional Positions
Net institutional flow: -$217.5M
▲ Buyers (20)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Victory Capital Management | DOUBLED | +738.3% | $15.0M | $12.6M |
| Balyasny Asset Management | ADD | +71.8% | $17.8M | $3.7M |
| BofA | ADD | +72.6% | $13.4M | $2.8M |
▼ Sellers (14)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Capital Group | TRIM | -61.1% | $209.7M | -$150.1M |
| Fidelity | TRIM | -32.7% | $108.8M | -$55.2M |
| Morgan Stanley | TRIM | -50.2% | $30.2M | -$19.2M |
Key Facts
- Capital Group trimmed 7.9M shares (61.1%), reducing its stake from $209.7M to $59.6M.
- Fidelity cut 2.19M shares (32.7%), from $108.8M to $53.5M.
- Morgan Stanley halved its position, selling 935.7K shares (50.2%), from $30.2M to $11.0M.
- Victory Capital Management more than doubled its stake (+738.3%), adding $12.6M to reach $15.0M.
- Balyasny Asset Management added 627.2K shares (+71.8%), increasing its position by $3.7M to $17.8M.
- Net institutional selling of approximately $217M in Q1 2026.
Financial Impact
Institutional net selling of approximately $217M in Q1 2026, with 14 sellers reducing holdings by $238M while 20 buyers added $20.6M.
Risk Factors
- Further institutional selling if earnings miss or guidance weakens
- Continued sector headwinds in ad-tech (privacy changes, competition)
- 13F data is 45 days lagged; positions may have already been adjusted
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-MGNI-2026-Q1 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 11, 2026 22d ago | Insider Cluster | $23.77 $23.84 | ▲ +0.29% | ▲ +0.74% | — |
Sep 10, 2026 22d ago | Press Release | $23.55 $23.77 | ▲ +0.93% | ▲ +0.08% | — |
Sep 10, 2026 23d ago | Insider Cluster | $23.55 $23.77 | ▲ +0.93% | ▲ +0.08% | — |
Sep 3, 2026 4w ago | Insider Cluster | $24.63 $24.14 | ▼ −1.99% | ▼ −1.60% | — |
Aug 12, 2026 7w ago | Insider Cluster | $24.34 $24.58 | ▲ +0.99% | ▲ +0.29% | — |
Aug 12, 2026 7w ago | Insider Cluster | $24.34 $24.58 | ▼ −0.99% | ▼ −0.29% | — |
Aug 12, 2026 7w ago | Insider Cluster | $24.34 $24.58 | ▼ −0.99% | ▼ −0.29% | — |
Aug 10, 2026 7w ago | 144 | $24.30 $24.34 | ▲ +0.16% | ▼ −0.09% | — |
Aug 7, 2026 8w ago | Insider Cluster | $24.21 $24.30 | ▼ −0.37% | ▼ −0.69% | — |
Aug 7, 2026 8w ago | Insider Cluster | $24.21 $24.30 | ▲ +0.37% | ▲ +0.69% | — |
US Market Status
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