13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger
PUBM

PubMatic

163 institutions still hold PubMatic as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 74467q103·163 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 4.5%
vs prior quarter
13F value held
$158M
47.0% inst. owned
of float
Holders
163
-85 QoQ
filers reporting
Activity
+8 / −6
+997 added · −866 reduced
this quarter
Concentration
15.82%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

163 institutions reported PUBM in Q1 2026. BlackRock, Inc. leads at 15.8% of the visible book. -85 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$25M3.1M0.00%Q1 202602
CenterBook Partners LP
CIK 0001872738
$14M1.7M0.77%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$13M1.6M0.00%Q1 202604
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$13M1.5M0.02%Q1 202605
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$10M1.2M0.00%Q1 202606
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$8M999K0.00%Q1 202607
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$8M951K0.00%Q1 202608
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 0000884414
$8M932K0.03%Q1 202609
STATE STREET CORP
CIK 0000093751
$6M791K0.00%Q1 202610
ROYAL BANK OF CANADA
CIK 0001000275
$6M740K0.00%Q1 202611
Walleye Trading LLC
CIK 0001388391
$6M714K0.01%Q1 202612
Whitefort Capital Management, LP
CIK 0001884931
$6M690K1.66%Q1 202613
S Squared Technology, LLC
CIK 0001322924
$6M676K2.09%Q1 202614
CITADEL ADVISORS LLC
CIK 0001423053
$5M595K0.00%Q4 202515
Vanguard Portfolio Management
CIK 0002100121
$5M639K0.00%Q1 202616
D. E. Shaw & Co., Inc.
CIK 0001009207
$5M546K0.00%Q4 202517
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$4M534K0.00%Q1 202618
Simcoe Capital LLC
CIK 0002109203
$4M486K3.65%Q1 202619
Trexquant Investment LP
CIK 0001633445
$3M422K0.02%Q1 202620
GOLDMAN SACHS GROUP INC
CIK 0000886982
$3M354K0.00%Q1 2026
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