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