SMWB Institutional Ownership & Shareholders
SIMILARWEB LTD (SMWB) is currently held by 72 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $245.13M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Naspers Ltd is currently the largest disclosed institutional shareholder of SMWB tracked by InsiderSet, reporting ownership valued at approximately $68.49M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $97.65M, representing an estimated gain of +42.58% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 78% of the total disclosed SMWB value among the investors covered in this analysis. Major shareholders include Naspers Ltd, Menora Mivtachim Holdings Ltd., Wellington Management Group Llp, and several other long-term asset managers with concentrated positions in SIMILARWEB LTD (SMWB).
This page ranks the largest institutional SMWB shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
72
Total Reported Value
$245.13M
Largest Holder
Naspers Ltd
Largest Position
$68.49M
Insider Transactions (90d)
14
Latest Filing Quarter
Q2 2026
New Institutional Positions
135
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Naspers Ltd | 81.19% | 11,173,265 | $68,492,114 | $97,654,336 | +$29,162,222 | +42.58% | |
| Menora Mivtachim Holdings Ltd. | 0.10% | 4,015,494 | $24,614,978 | $35,095,418 | +$10,480,440 | +42.58% | |
| Wellington Management Group Llp | 0.00% | 3,624,685 | $22,219,319 | $31,679,747 | +$9,460,428 | +42.58% | |
| Ion Crossover Partners Ltd | 24.88% | 3,030,826 | $18,578,963 | $26,489,419 | +$7,910,456 | +42.58% | |
| Ulysses Management Llc | 6.21% | 2,928,474 | $17,951,546 | $25,594,863 | +$7,643,317 | +42.58% | |
| S Squared Technology, Llc | 3.21% | 1,690,000 | $10,359,700 | $14,770,600 | +$4,410,900 | +42.58% | |
| Y.D. More Investments Ltd | 0.26% | 1,147,035 | $8,900,992 | $10,025,086 | +$1,124,094 | +12.63% | |
| Schonfeld Strategic Advisors Llc | 0.04% | 1,210,629 | $7,421,154 | $10,580,897 | +$3,159,743 | +42.58% | |
| Centerbook Partners Lp | 0.31% | 881,065 | $6,837,064 | $7,700,508 | +$863,444 | +12.63% | |
| ARK Invest | Cathie Wood | 0.03% | 834,663 | $5,116,484 | $7,294,955 | +$2,178,471 | +42.58% |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 713,728 | $4,375,153 | $6,237,983 | +$1,862,830 | +42.58% |
| Cdc Financial, Inc. | 3.18% | 674,233 | $4,133,048 | $5,892,796 | +$1,759,748 | +42.58% | |
| Alpha Family Trust | 1.62% | 658,935 | $4,039,272 | $5,759,092 | +$1,719,820 | +42.58% | |
| Nano Cap New Millennium Growth Fund L P | 3.06% | 650,000 | $3,984,500 | $5,681,000 | +$1,696,500 | +42.58% | |
| Sphera Management Technology Funds Ltd | 1.32% | 615,000 | $3,769,950 | $5,375,100 | +$1,605,150 | +42.58% | |
| Lotus Technology Management, Lp | 4.18% | 531,409 | $3,403,907 | $4,644,515 | +$1,240,608 | +36.45% | |
| Jane Street Group, Llc | 0.00% | 513,277 | $3,146,388 | $4,486,041 | +$1,339,653 | +42.58% | |
| Peak6 Llc | 0.07% | 484,822 | $2,971,959 | $4,237,344 | +$1,265,385 | +42.58% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | 445,691 | $2,732,086 | $3,895,339 | +$1,163,253 | +42.58% | |
| Ubs Group Ag | 0.00% | 403,328 | $2,472,401 | $3,525,087 | +$1,052,686 | +42.58% | |
| Citadel Advisors Llc | 0.00% | 346,735 | $2,125,486 | $3,030,464 | +$904,978 | +42.58% | |
| Y-Intercept (Hong Kong) Ltd | 0.04% | 261,713 | $2,030,893 | $2,287,372 | +$256,479 | +12.63% | |
| Morgan Stanley | 0.00% | 268,203 | $1,644,084 | $2,344,094 | +$700,010 | +42.58% | |
| Lavelle Capital Lp | 0.63% | 202,727 | $1,242,717 | $1,771,834 | +$529,117 | +42.58% | |
| Persistent Asset Partners Ltd | 0.35% | 180,000 | $1,103,400 | $1,573,200 | +$469,800 | +42.58% | |
| Susquehanna Fundamental Investments, Llc | 0.02% | 169,885 | $1,041,395 | $1,484,795 | +$443,400 | +42.58% | |
| D. E. Shaw & Co., Inc. | 0.00% | 159,935 | $980,402 | $1,397,832 | +$417,430 | +42.58% | |
| State Of Wyoming | 0.07% | 118,170 | $916,999 | $1,032,806 | +$115,807 | +12.63% | |
| Antipodes Partners Ltd | 0.02% | 145,601 | $892,534 | $1,272,553 | +$380,019 | +42.58% | |
| Susquehanna International Group, Llp | 0.00% | 138,417 | $848,496 | $1,209,765 | +$361,269 | +42.58% | |
| Blackrock, Inc. | 0.00% | 133,533 | $818,557 | $1,167,078 | +$348,521 | +42.58% | |
| Two Sigma Investments, Lp | 0.00% | 129,851 | $795,987 | $1,134,898 | +$338,911 | +42.58% | |
| Myda Advisors Llc | 0.15% | 100,000 | $613,000 | $874,000 | +$261,000 | +42.58% | |
| Gsa Capital Partners Llp | 0.04% | 95,899 | $588,000 | $838,157 | +$250,157 | +42.54% | |
| State Street Corp | 0.00% | 77,054 | $472,341 | $673,452 | +$201,111 | +42.58% | |
| Quadrature Capital Ltd | 0.00% | 68,207 | $418,109 | $596,129 | +$178,020 | +42.58% | |
| Marshall Wace, Llp | 0.00% | 60,981 | $373,814 | $532,974 | +$159,160 | +42.58% | |
| Centiva Capital, Lp | 0.01% | 45,919 | $281,483 | $401,332 | +$119,849 | +42.58% | |
| Wealthtrust Axiom Llc | 0.06% | 44,565 | $273,182 | $389,498 | +$116,316 | +42.58% | |
| Wealth Enhancement Advisory Services, Llc | 0.00% | 28,500 | $240,255 | $249,090 | +$8,835 | +3.68% | |
| Imc-Chicago, Llc | 0.00% | 37,506 | $229,912 | $327,802 | +$97,890 | +42.58% | |
| Simplex Trading, Llc | 0.01% | 33,066 | $202,694 | $288,997 | +$86,303 | +42.58% | |
| Qube Research & Technologies Ltd | 0.00% | 31,847 | $195,222 | $278,343 | +$83,121 | +42.58% | |
| Lazard Asset Management Llc | 0.00% | 23,566 | $144,460 | $205,967 | +$61,507 | +42.58% | |
| Sg Americas Securities, Llc | 0.00% | 22,064 | $135,000 | $192,839 | +$57,839 | +42.84% | |
| Pathstone Holdings, Llc | 0.00% | 50,390 | $131,518 | $440,409 | +$308,891 | +234.87% | |
| Millennium Management Llc | 0.00% | 18,198 | $111,554 | $159,051 | +$47,497 | +42.58% | |
| Integrated Wealth Concepts Llc | 0.00% | 15,000 | $91,950 | $131,100 | +$39,150 | +42.58% | |
| Marathon Capital Management | 0.02% | 10,000 | $77,600 | $87,400 | +$9,800 | +12.63% | |
| R Squared Ltd | 0.04% | 11,256 | $68,999 | $98,377 | +$29,378 | +42.58% |
Frequently asked questions about SMWB
Who are the largest institutional holders of SMWB?
The largest institutional holders of SMWB reported in the latest SEC Form 13F filings include Naspers Ltd, Menora Mivtachim Holdings Ltd., Wellington Management Group Llp, Ion Crossover Partners Ltd, and Ulysses Management Llc. InsiderSet ranks institutional holders by their latest reported SMWB position.
What is SMWB institutional ownership?
This page tracks SMWB positions reported by institutional investment managers through SEC Form 13F. SIMILARWEB LTD (SMWB) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own SMWB?
InsiderSet currently tracks 72 institutional managers reporting SMWB holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of SMWB shareholders.
How much SMWB stock do institutions own?
Institutional investment managers disclosed approximately $245.13M in SMWB holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was SMWB institutional ownership last updated?
The latest SMWB institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional SMWB holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its SMWB position after the reporting date.
Are institutions buying or selling SMWB?
Institutional buying and selling can be analyzed by comparing SMWB positions across consecutive 13F reporting periods. InsiderSet's SMWB Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View SMWB ownership changes.
How has SMWB institutional ownership changed over time?
InsiderSet tracks SMWB institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.