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PubMatic
PUBM

153 hedge funds and large institutions have $236M invested in PubMatic in 2026 Q1 according to their latest regulatory filings, with 33 funds opening new positions, 59 increasing their positions, 41 reducing their positions, and 30 closing their positions.

New
Increased
Maintained
Reduced
Closed

200% more funds holding in top 10

Funds holding in top 10: 1 → 3 (+2)

44% more repeat investments, than reductions

Existing positions increased: 59 | Existing positions reduced: 41

10% more first-time investments, than exits

New positions opened: 33 | Existing positions closed: 30

1.22% more ownership

Funds ownership: 72.46% → 73.68% (+1.2%)

1% more funds holding

Funds holding: 152 → 153 (+1)

4% less capital invested

Capital invested by funds: $245M → $236M (-$9.26M)

21% less call options, than puts

Call options by funds: $7.64M | Put options by funds: $9.72M

Holders
153
Holders Change
+1
Holders Change %
+0.66%
% of All Funds
1.88%
Holding in Top 10
3
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+200%
% of All Funds
0.04%
New
33
Increased
59
Reduced
41
Closed
30
Calls
$7.64M
Puts
$9.72M
Net Calls
-$2.08M
Net Calls Change
-$3.53M

Top Buyers

Rank Fund Capital Flow
1
WCM
Whitefort Capital Management
New York
+$5.3M
2
Acadian Asset Management
Acadian Asset Management
Massachusetts
+$5M
3
CP
CenterBook Partners
Connecticut
+$4.57M
4
GHC
Graham Holdings Company
Virginia
+$4.36M
5
SST
S Squared Technology
New York
+$3.04M

Top Sellers

Rank Fund Capital Flow
1
Wellington Management Group
Wellington Management Group
Massachusetts
-$10.4M
2
Millennium Management
Millennium Management
New York
-$6.35M
3
AG
Algert Global
California
-$2.79M
4
Walleye Capital
Walleye Capital
New York
-$1.39M
5
Marshall Wace
Marshall Wace
United Kingdom
-$1.29M
Name Holding Trade Value Shares
Change 		Change in
Stake
QL
176
Quarry LP
New York
– -$30K -3,387 Closed
ACM
177
Aquatic Capital Management
Illinois
– -$23.9K -2,698 Closed
LFG
178
Larson Financial Group
Missouri
– -$11.4K -1,282 Closed
AB
179
Amalgamated Bank
New York
– -$10K -1,183 Closed
FCMT
180
Founders Capital Management (Texas)
Texas
– -$8.87K -1,000 Closed
QCG
181
Quadrant Capital Group
Ohio
– -$6.22K -701 Closed
AUB
182
Atlantic Union Bankshares
Virginia
– -$1.16K -131 Closed
SWM
183
SHP Wealth Management
Massachusetts
– -$27 -3 Closed
4 5 6 7
8

PUBM Hedge Fund Activity: Q1 2026 in Review

153 of the 8,126 institutional investors tracked by Wall St. Rank reported a position in PubMatic (PUBM) for Q1 2026, worth a combined $236M — down 3.8% from $245M a quarter earlier.

Buyers outnumbered sellers: 33 funds opened new PUBM positions and 30 closed out — a net gain of 3 holders — while 59 added to existing stakes and 41 trimmed.

The largest buyer was Whitefort Capital Management, opening a new position worth an estimated $5.3M. The largest seller was Wellington Management Group, exiting entirely with an estimated $10.4M sold.

  • 153 institutional investors held PubMatic (PUBM) as of Q1 2026, up from 152 in Q4 2025.
  • Funds reported $236M of PubMatic stock for Q1 2026, down 3.8% quarter-over-quarter.
  • 33 funds opened new PubMatic positions in Q1 2026 and 30 closed out, a net change of +3 holders.
  • The largest PubMatic buyer in Q1 2026 was Whitefort Capital Management, an estimated $5.3M added.
  • The largest PubMatic seller in Q1 2026 was Wellington Management Group, an estimated $10.4M sold.

Based on aggregated 13F filings for Q1 2026.