13F Insight
DOSSIER · 13F Holders · Q1 2026Mega-capCrowded

SIMILARWEB LTD

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

CUSIP m84137104·85 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 1.7%
vs prior quarter
13F value held
$105M
55.0% inst. owned
of float
Holders
85
-122 QoQ
filers reporting
Activity
+59 / −88
+877 added · −781 reduced
this quarter
Concentration
27.71%
NASPERS LTD #1
top holder share
AI Holders Summary · Q1 2026

85 institutions reported SIMILARWEB LTD in Q1 2026. NASPERS LTD leads at 27.7% of the visible book. -122 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
NASPERS LTD
CIK 0001106051
$29M11.2M11.53%Q1 202602
MENORA MIVTACHIM HOLDINGS LTD.
CIK 0001351917
$10M4.0M0.05%Q1 202603
Y.D. More Investments Ltd
CIK 0001870364
$8M1.2M0.33%Q1 202604
ION Crossover Partners Ltd
CIK 0001803307
$8M3.0M21.45%Q1 202605
Ulysses Management LLC
CIK 0001510912
$8M3.0M0.98%Q1 202606
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$8M3.0M0.00%Q1 202607
S Squared Technology, LLC
CIK 0001322924
$4M1.6M1.58%Q1 202608
Portolan Capital Management, LLC
CIK 0001350290
$4M493K0.20%Q4 202509
CITADEL ADVISORS LLC
CIK 0001423053
$4M486K0.00%Q4 202510
CenterBook Partners LP
CIK 0001872738
$3M1.3M0.19%Q1 202611
Alpha Family Trust
CIK 0001568991
$2M659K1.10%Q1 202612
MARSHALL WACE, LLP
CIK 0001318757
$2M292K0.00%Q4 202513
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$2M826K0.00%Q1 202614
MIRABELLA FINANCIAL SERVICES LLP
CIK 0001538853
$2M793K0.20%Q1 202615
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$2M740K0.00%Q1 202616
WOLVERINE TRADING, LLC
CIK 0000927337
$2M179K0.00%Q3 202517
Herald Investment Management Ltd
CIK 0001512022
$2M645K0.23%Q1 202618
CDC Financial, Inc.
CIK 0002077836
$2M639K1.06%Q1 202619
Sphera Management Technology Funds Ltd
CIK 0002030525
$2M615K0.90%Q1 202620
MORGAN STANLEY
CIK 0000895421
$2M592K0.00%Q1 2026
Page 1 of 5
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