The cluster is dominated by active-manager selling (Nuveen, Legal & General) and passive buying (Morgan Stanley, Fidelity), suggesting no strong shared thesis. Monitor upcoming earnings for fundamental catalysts that could shift active manager sentiment. The 68% analyst bullishness contrasts with the selling, creating a watch-and-wait setup.
Executive Summary
Q4 2025 13F cluster for PubMatic shows mixed institutional activity: two passive buyers (Morgan Stanley doubling its stake to $2.8M, Fidelity adding modestly) offset by three sellers, including Nuveen exiting 78% of its position ($2.4M reduction) and Legal & General cutting 82%. The net dollar flow is negative (-$1.2M), driven by active asset managers reducing exposure, while the buying is entirely passive/index-driven. With a $519M market cap and 68% analyst bullishness, the cluster suggests institutional rotation rather than a fundamental catalyst.
Key Financial Metrics
Institutional Positions
Net institutional flow: -$1.2M
▲ Buyers (2)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Morgan Stanley | DOUBLED | +100.7% | $2.8M | $1.5M |
| Fidelity | ADD | +44% | $36.0K | $13.0K |
▼ Sellers (3)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Nuveen | NEAR_EXIT | -78.3% | $3.1M | -$2.4M |
| Legal & General Group | NEAR_EXIT | -81.7% | $383.3K | -$308.3K |
| T. Rowe Price | TRIM | -35.3% | $293.00 | -$90.00 |
Key Facts
- Morgan Stanley doubled its PUBM stake to 320.4K shares worth $2.8M, adding $1.5M in value.
- Nuveen cut 78% of its position, reducing holdings from $3.1M to $731K, the largest seller by dollar amount.
- Legal & General reduced by 82%, exiting all but $75K of its prior $384K position.
- T. Rowe Price trimmed 35% of its stake, a negligible $90 reduction in value.
- Total buying was $2.9M (current holdings) vs total selling of $3.5M (prior holdings), net outflow of ~$1.2M.
- All three sellers are active asset managers; both buyers are mega-passive/index funds, weakening the bullish signal.
Financial Impact
Net institutional outflow of approximately $1.2M in Q4 2025, with $2.9M in buying (all passive) vs $3.5M in selling (all active managers).
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound or added to since quarter-end.
- Passive buying may reflect index rebalancing rather than conviction, offering no directional signal.
- Active manager selling could indicate concerns about PubMatic's growth trajectory or competitive position.
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-PUBM-2025-Q4 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 24, 2026 8d ago | ANALYST-UPGRADE | $18.55 $18.73 | ▲ +0.97% | ▲ +1.56% | — |
Sep 4, 2026 28d ago | Insider Cluster | $16.29 $16.78 | ▲ +3.01% | ▲ +4.13% | — |
Aug 21, 2026 6w ago | Insider Cluster | $16.36 $16.63 | ▼ −1.65% | ▼ −1.18% | — |
Aug 18, 2026 6w ago | Insider Cluster | $16.78 $16.25 | ▼ −3.16% | ▼ −2.77% | — |
Aug 14, 2026 7w ago | Insider Cluster | $17.59 $16.41 | ▲ +6.71% | ▲ +5.34% | — |
Aug 10, 2026 7w ago | Insider Cluster | $17.65 $17.36 | ▼ −1.64% | ▼ −1.24% | — |
Jul 27, 2026 9w ago | Insider Cluster | $13.03 $12.96 | ▲ +0.54% | ▲ +2.81% | — |
Jul 17, 2026 11w ago | Insider Cluster | $12.73 $12.30 | ▼ −3.38% | ▼ −2.69% | — |
Jul 6, 2026 12w ago | Insider Cluster | $13.32 $13.69 | ▲ +2.78% | ▲ +2.23% | — |
Jun 11, 2026 16w ago | Institutional Cluster | $11.27 $11.30 | ▲ +0.27% | ▼ −0.17% | — |
US Market Status
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