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 (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Schonfeld Strategic Advisors Llc, Millennium Management Llc, Wellington Management Group Llp, Marshall Wace, Llp, and Lotus Technology Management, Lp.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Integrated Wealth Concepts Llc | Buy | +15,000 | — | 15,000 | $91.95K | Q2 2026 | Sep 09, 2026 |
| Citadel Advisors Llc | Sell | -129,270 | -27.2% | 346,735 | $2.13M | Q2 2026 | Sep 02, 2026 |
| Schonfeld Strategic Advisors Llc | Buy | +921,455 | +318.7% | 1,210,629 | $7.42M | Q2 2026 | Aug 14, 2026 |
| Millennium Management Llc | Sell | -807,565 | -97.8% | 18,198 | $111.55K | Q2 2026 | Aug 14, 2026 |
| Wellington Management Group Llp | Buy | +657,928 | +22.2% | 3,624,685 | $22.22M | Q2 2026 | Aug 14, 2026 |
| Lotus Technology Management, Lp | Buy | +531,409 | — | 531,409 | $3.40M | Q2 2026 | Aug 14, 2026 |
| ARK Invest | Buy | +482,593 | +137.1% | 834,663 | $5.12M | Q2 2026 | Aug 14, 2026 |
| Qube Research & Technologies Ltd | Sell | -384,299 | -92.3% | 31,847 | $195.22K | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Buy | +282,011 | +121.9% | 513,277 | $3.15M | Q2 2026 | Aug 14, 2026 |
| Nano Cap New Millennium Growth Fund L P | Buy | +260,000 | +66.7% | 650,000 | $3.98M | Q2 2026 | Aug 14, 2026 |
| Xtx Topco Ltd | Sell | -217,974 | -95.2% | 10,906 | $66.85K | Q2 2026 | Aug 14, 2026 |
| Susquehanna International Group, Llp | Buy | +138,417 | — | 138,417 | $848.50K | Q2 2026 | Aug 14, 2026 |
| D. E. Shaw & Co., Inc. | Buy | +101,383 | +173.2% | 159,935 | $980.40K | Q2 2026 | Aug 14, 2026 |
| S Squared Technology, Llc | Buy | +90,000 | +5.6% | 1,690,000 | $10.36M | Q2 2026 | Aug 14, 2026 |
| Ulysses Management Llc | Sell | -70,000 | -2.3% | 2,928,474 | $17.95M | Q2 2026 | Aug 14, 2026 |
| Two Sigma Investments, Lp | Buy | +50,775 | +64.2% | 129,851 | $795.99K | Q2 2026 | Aug 14, 2026 |
| Susquehanna Fundamental Investments, Llc | Buy | +44,262 | +35.2% | 169,885 | $1.04M | Q2 2026 | Aug 14, 2026 |
| Cdc Financial, Inc. | Buy | +35,219 | +5.5% | 674,233 | $4.13M | Q2 2026 | Aug 14, 2026 |
| Lazard Asset Management Llc | Buy | +12,338 | +109.9% | 23,566 | $144.46K | Q2 2026 | Aug 14, 2026 |
| Prelude Capital Management, Llc | Buy | +10,411 | — | 10,411 | $63.82K | Q2 2026 | Aug 14, 2026 |
| Barclays Plc | Sell | -9,921 | -93.5% | 690 | $4.23K | Q2 2026 | Aug 14, 2026 |
| Royal Bank Of Canada | Buy | +5,700 | +2850.0% | 5,900 | $36.00K | Q2 2026 | Aug 14, 2026 |
| Wells Fargo & Company/Mn | Buy | +1,000 | +12.2% | 9,200 | $56.40K | Q2 2026 | Aug 14, 2026 |
| Quarry Lp | Buy | +149 | — | 149 | $913.00 | Q2 2026 | Aug 14, 2026 |
| Marshall Wace, Llp | Sell | -577,207 | -90.4% | 60,981 | $373.81K | Q2 2026 | Aug 13, 2026 |
| Acadian Asset Management Llc | Sell | -398,857 | -98.3% | 6,750 | $41.00K | Q2 2026 | Aug 13, 2026 |
| Morgan Stanley | Sell | -323,660 | -54.7% | 268,203 | $1.64M | Q2 2026 | Aug 13, 2026 |
| Ubs Group Ag | Buy | +204,785 | +103.1% | 403,328 | $2.47M | Q2 2026 | Aug 13, 2026 |
| Peak6 Llc | Buy | +163,666 | +51.0% | 484,822 | $2.97M | Q2 2026 | Aug 13, 2026 |
| Myda Advisors Llc | Buy | +100,000 | — | 100,000 | $613.00K | Q2 2026 | Aug 13, 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.
Related SMWB Institutional Insights
- SMWB Overview
- SMWB 13F Institutional Holders
- SMWB Top Institutional Shareholders
- Technology Sector Institutional Ownership
- Technology Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
- Most Bought Technology Stocks By Institutional Investors
- Most Sold Technology Stocks By Institutional Investors
- SMWB Insider Trading & SEC Form 4 Activity
- SMWB Articles
- Top Institutional Investor Stock Rankings