PubMatic
PUBM
153 hedge funds and large institutions have $399M invested in PubMatic in 2026 Q2 according to their latest regulatory filings, with 20 funds opening new positions, 58 increasing their positions, 46 reducing their positions, and 17 closing their positions.
71% more call options, than puts
Call options by funds: $18.6M | Put options by funds: $10.9M
69% more capital invested
Capital invested by funds: $236M → $399M (+$163M)
26% more repeat investments, than reductions
Existing positions increased: 58 | Existing positions reduced: 46
18% more first-time investments, than exits
New positions opened: 20 | Existing positions closed: 17
6.09% more ownership
Funds ownership: 73.68% → 79.78% (+6.1%)
0% more funds holding
Funds holding: 153 → 153 (0)
0% more funds holding in top 10
Funds holding in top 10: 2 → 2 (0)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
HCM
Highbridge Capital Management
New York
|
+$6.7M |
| 2 |
American Century Companies
Kansas City,
Missouri
|
+$5.5M |
| 3 |
WCM
Whitefort Capital Management
New York
|
+$4.37M |
| 4 |
Nuveen
Charlotte,
North Carolina
|
+$3.96M |
| 5 |
Vanguard Portfolio Management
Malvern,
Pennsylvania
|
+$3.21M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
CP
CenterBook Partners
Greenwich,
Connecticut
|
-$13.8M |
| 2 |
D.E. Shaw & Co
New York
|
-$4.16M |
| 3 |
Tudor Investment Corp
Stamford,
Connecticut
|
-$2.87M |
| 4 |
Royal Bank of Canada
Toronto,
Ontario, Canada
|
-$1.26M |
| 5 |
Renaissance Technologies
New York
|
-$1.24M |
PUBM Hedge Fund Activity: Q2 2026 in Review
153 of the 8,303 institutional investors tracked by Wall St. Rank reported a position in PubMatic (PUBM) for Q2 2026, worth a combined $399M — up 69% from $236M a quarter earlier.
Buyers outnumbered sellers: 20 funds opened new PUBM positions and 17 closed out — a net gain of 3 holders — while 58 added to existing stakes and 46 trimmed.
The largest buyer was Highbridge Capital Management, opening a new position worth an estimated $6.7M. The largest seller was CenterBook Partners, cutting an estimated $13.8M.
- 153 institutional investors held PubMatic (PUBM) as of Q2 2026, unchanged from Q1 2026.
- Funds reported $399M of PubMatic stock for Q2 2026, up 69% quarter-over-quarter.
- 20 funds opened new PubMatic positions in Q2 2026 and 17 closed out, a net change of +3 holders.
- The largest PubMatic buyer in Q2 2026 was Highbridge Capital Management, an estimated $6.7M added.
- The largest PubMatic seller in Q2 2026 was CenterBook Partners, an estimated $13.8M sold.
Based on aggregated 13F filings for Q2 2026.