PubMatic
PUBM
149 hedge funds and large institutions have $322M invested in PubMatic in 2025 Q2 according to their latest regulatory filings, with 25 funds opening new positions, 54 increasing their positions, 46 reducing their positions, and 32 closing their positions.
58% more call options, than puts
Call options by funds: $6.93M | Put options by funds: $4.37M
35% more capital invested
Capital invested by funds: $238M → $322M (+$83.5M)
17% more repeat investments, than reductions
Existing positions increased: 54 | Existing positions reduced: 46
0% more funds holding in top 10
Funds holding in top 10: 1 → 1 (0)
0.06% less ownership
Funds ownership: 64.68% → 64.62% (-0.06%)
5% less funds holding
Funds holding: 157 → 149 (-8)
22% less first-time investments, than exits
New positions opened: 25 | Existing positions closed: 32
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
+$3.91M |
| 2 |
Wellington Management Group
Boston,
Massachusetts
|
+$2.69M |
| 3 |
CP
CenterBook Partners
Greenwich,
Connecticut
|
+$2.33M |
| 4 |
Jacobs Levy Equity Management
Florham Park,
New Jersey
|
+$2.27M |
| 5 |
Acadian Asset Management
Boston,
Massachusetts
|
+$1.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Vanguard Group
Malvern,
Pennsylvania
|
-$8.46M |
| 2 |
NC
Nixon Capital
Austin,
Texas
|
-$5.75M |
| 3 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
-$2.47M |
| 4 |
Pacer Advisors
Malvern,
Pennsylvania
|
-$2.46M |
| 5 |
Morgan Stanley
New York
|
-$2.3M |
PUBM Hedge Fund Activity: Q2 2025 in Review
149 of the 7,596 institutional investors tracked by Wall St. Rank reported a position in PubMatic (PUBM) for Q2 2025, worth a combined $322M — up 35% from $238M a quarter earlier.
Sellers outnumbered buyers: 32 funds closed out of PUBM and 25 opened new positions — a net loss of 7 holders — while 46 trimmed existing stakes and 54 added.
The largest buyer was Citadel Advisors, adding an estimated $3.91M. The largest seller was Vanguard Group, cutting an estimated $8.46M.
- 149 institutional investors held PubMatic (PUBM) as of Q2 2025, down from 157 in Q1 2025.
- Funds reported $322M of PubMatic stock for Q2 2025, up 35% quarter-over-quarter.
- 25 funds opened new PubMatic positions in Q2 2025 and 32 closed out, a net change of -7 holders.
- The largest PubMatic buyer in Q2 2025 was Citadel Advisors, an estimated $3.91M added.
- The largest PubMatic seller in Q2 2025 was Vanguard Group, an estimated $8.46M sold.
Based on aggregated 13F filings for Q2 2025.