PubMatic
PUBM
152 hedge funds and large institutions have $245M invested in PubMatic in 2025 Q4 according to their latest regulatory filings, with 30 funds opening new positions, 52 increasing their positions, 52 reducing their positions, and 26 closing their positions.
27% more call options, than puts
Call options by funds: $6.78M | Put options by funds: $5.33M
15% more first-time investments, than exits
New positions opened: 30 | Existing positions closed: 26
7% more capital invested
Capital invested by funds: $229M → $245M (+$16.5M)
1% more funds holding
Funds holding: 150 → 152 (+2)
0% more funds holding in top 10
Funds holding in top 10: 1 → 1 (0)
0% more repeat investments, than reductions
Existing positions increased: 52 | Existing positions reduced: 52
1.26% less ownership
Funds ownership: 73.72% → 72.46% (-1.3%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$6.09M |
| 2 |
CP
CenterBook Partners
Greenwich,
Connecticut
|
+$3.47M |
| 3 |
TI
Trexquant Investment
Stamford,
Connecticut
|
+$2.18M |
| 4 |
Acadian Asset Management
Boston,
Massachusetts
|
+$2.08M |
| 5 |
AG
Algert Global
San Francisco,
California
|
+$1.67M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AI
Acuitas Investments
Seattle,
Washington
|
-$2.94M |
| 2 |
N
Nuveen
Charlotte,
North Carolina
|
-$2.6M |
| 3 |
Wellington Management Group
Boston,
Massachusetts
|
-$2.59M |
| 4 |
UBS Group
Zurich,
Switzerland
|
-$2.43M |
| 5 |
BlackRock
New York
|
-$2.31M |
PUBM Hedge Fund Activity: Q4 2025 in Review
152 of the 8,227 institutional investors tracked by Wall St. Rank reported a position in PubMatic (PUBM) for Q4 2025, worth a combined $245M — up 7.2% from $229M a quarter earlier.
Buyers outnumbered sellers: 30 funds opened new PUBM positions and 26 closed out — a net gain of 4 holders — while 52 added to existing stakes and 52 trimmed.
The largest buyer was Millennium Management, adding an estimated $6.09M. The largest seller was Acuitas Investments, exiting entirely with an estimated $2.94M sold.
- 152 institutional investors held PubMatic (PUBM) as of Q4 2025, up from 150 in Q3 2025.
- Funds reported $245M of PubMatic stock for Q4 2025, up 7.2% quarter-over-quarter.
- 30 funds opened new PubMatic positions in Q4 2025 and 26 closed out, a net change of +4 holders.
- The largest PubMatic buyer in Q4 2025 was Millennium Management, an estimated $6.09M added.
- The largest PubMatic seller in Q4 2025 was Acuitas Investments, an estimated $2.94M sold.
Based on aggregated 13F filings for Q4 2025.