PUBM PubMatic, Inc.
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 |
Actionable Insight
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.
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
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 | ||||
|---|---|---|---|---|---|
|
Jun 11, 2026
1d ago
|
Institutional Cluster
| $11.07 awaiting T+5 | awaiting T+5 | — | — |
|
May 19, 2026
24d ago
|
Insider Cluster
| $9.88 $11.44 | ▼ −15.79% | ▼ −13.99% | — |
|
May 16, 2026
27d ago
|
ANALYST-UPGRADE
| $8.10 $8.91 | ▲ +10.00% | ▲ +11.69% | — |
|
Apr 22, 2026
7w ago
|
8-K
| $9.16 $9.72 | ▲ +6.11% | ▲ +4.64% | — |
|
Apr 16, 2026
8w ago
|
ANALYST-UPGRADE
| $9.79 $9.16 | ▼ −6.44% | ▼ −7.42% | — |
|
Apr 16, 2026
8w ago
|
ANALYST-UPGRADE
| $9.79 $9.16 | ▼ −6.44% | ▼ −7.42% | — |
|
Apr 16, 2026
8w ago
|
ANALYST-DOWNGRADE
| $9.79 $9.16 | ▲ +6.44% | ▲ +7.42% | — |
|
Apr 16, 2026
8w ago
|
ANALYST-DOWNGRADE
| $9.79 $9.16 | ▲ +6.44% | ▲ +7.42% | — |
|
Apr 16, 2026
8w ago
|
ANALYST-UPGRADE
| $9.79 $9.16 | ▼ −6.44% | ▼ −7.42% | — |
|
Apr 16, 2026
8w ago
|
ANALYST-UPGRADE
| $9.79 $9.16 | ▼ −6.44% | ▼ −7.42% | — |
US Market Status
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