SIMILARWEB LTD (SMWB) Institutional Ownership Changes & 13F Activity

SIMILARWEB LTD (SMWB). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q4 2025). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Naspers Ltd, Ion Crossover Partners Ltd, Wellington Management Group Llp, Ulysses Management Llc, and Portolan Capital Management, Llc.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Ion Crossover Partners LtdBuy+3,030,826—3,030,826$22.70MQ4 2025May 20, 2026
Newedge Advisors, LlcBuy+109—109$816.00Q4 2025Feb 18, 2026
Naspers LtdBuy+11,173,265—11,173,265$83.69MQ4 2025Feb 17, 2026
Wellington Management Group LlpBuy+3,001,433—3,001,433$22.48MQ4 2025Feb 17, 2026
Ulysses Management LlcBuy+2,998,474—2,998,474$22.46MQ4 2025Feb 17, 2026
Portolan Capital Management, LlcBuy+492,861—492,861$3.69MQ4 2025Feb 17, 2026
Sphera Management Technology Funds LtdBuy+480,000—480,000$3.60MQ4 2025Feb 17, 2026
Millennium Management LlcBuy+357,807—357,807$2.68MQ4 2025Feb 17, 2026
Citadel Advisors LlcBuy+200,114—200,114$1.50MQ4 2025Feb 17, 2026
Persistent Asset Partners LtdBuy+180,000—180,000$1.35MQ4 2025Feb 17, 2026
Russell Investments Group, Ltd.Buy+148,339—148,339$1.11MQ4 2025Feb 17, 2026
Ameriprise Financial IncBuy+138,422—138,422$1.04MQ4 2025Feb 17, 2026
Numerai Gp LlcBuy+117,949—117,949$883.44KQ4 2025Feb 17, 2026
Trexquant Investment LpBuy+108,038—108,038$809.21KQ4 2025Feb 17, 2026
Point72 Asset Management, L.P.Buy+89,149—89,149$667.73KQ4 2025Feb 17, 2026
Northern Trust CorpBuy+80,549—80,549$603.31KQ4 2025Feb 17, 2026
Blair William & Co/IlBuy+71,044—71,044$532.12KQ4 2025Feb 17, 2026
Jump Financial, LlcBuy+63,321—63,321$474.27KQ4 2025Feb 17, 2026
Engineers Gate Manager LpBuy+62,800—62,800$470.37KQ4 2025Feb 17, 2026
Public Employees Retirement System Of OhioBuy+60,419—60,419$452.54KQ4 2025Feb 17, 2026
California State Teachers Retirement SystemBuy+48,217—48,217$361.14KQ4 2025Feb 17, 2026
Pdt Partners, LlcBuy+40,794—40,794$305.55KQ4 2025Feb 17, 2026
Pharvision Advisers, LlcBuy+35,684—35,684$267.27KQ4 2025Feb 17, 2026
Exoduspoint Capital Management, LpBuy+29,931—29,931$224.18KQ4 2025Feb 17, 2026
D. E. Shaw & Co., Inc.Buy+28,376—28,376$212.54KQ4 2025Feb 17, 2026
Qube Research & Technologies LtdBuy+16,582—16,582$124.20KQ4 2025Feb 17, 2026
Lazard Asset Management LlcBuy+13,736—13,736$102.88KQ4 2025Feb 17, 2026
Two Sigma Advisers, LpBuy+13,000—13,000$97.37KQ4 2025Feb 17, 2026
Boothbay Fund Management, LlcBuy+11,961—11,961$89.59KQ4 2025Feb 17, 2026
Bank Of America CorpBuy+11,122—11,122$83.30KQ4 2025Feb 17, 2026
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Frequently asked questions about SMWB activity

  • Which institutional owners are buying SMWB?

    Institutional owners buying SMWB include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in SMWB activity?

    "Buy" means an investor increased their reported position in SMWB compared to the prior reporting period. This reflects growing exposure to SIMILARWEB LTD (SMWB) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in SMWB increasing?

    Institutional interest in SMWB can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.