SIMILARWEB LTD (SMWB)
Institutional ownership reported to the SEC as of Q2 2026, across 21 quarters.
68
Reporting holders
$250.9M
Reported value
46.7%
Of shares outstanding
0.8%
Held as options
-9
Holder change
Institutions report 40,588,084 shares against 86,962,202 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Share count carried from an earlier filing (cy2025q4i).
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| NASPERS LTD | $68.5M | 11,173,265 | 81.19% | 19q | HELD |
| MENORA MIVTACHIM HOLDINGS LTD. | $24.6M | 4,015,494 | 0.10% | 9q | HELD |
| WELLINGTON MANAGEMENT GROUP LLP | $22.2M | 3,624,685 | 0.00% | 6q | +22.2%+$4.0M |
| ION Crossover Partners Ltd | $18.6M | 3,030,826 | 24.88% | 13q | HELD |
| Ulysses Management LLC | $18.0M | 2,928,474 | 3.55% | 19q | -2.3%-$429.1K |
| S SQUARED TECHNOLOGY, LLC | $10.4M | 1,690,000 | 3.21% | 10q | +5.6%+$551.7K |
| P.A.W. CAPITAL CORP | $7.8M | 1,280,000 | 3.00% | 8q | +28.0%+$1.7M |
| Schonfeld Strategic Advisors LLC | $7.4M | 1,210,629 | 0.03% | 2q | +318.7%+$5.6M |
| Y.D. More Investments Ltd | $7.0M | 1,147,035 | 0.22% | 12q | HELD |
| ARK Investment Management LLC | $5.1M | 834,663 | 0.03% | 20q | +137.1%+$3.0M |
| RENAISSANCE TECHNOLOGIES LLC | $4.4M | 713,728 | 0.01% | 17q | -3.5%-$159.0K |
| CDC Financial, Inc. | $4.1M | 674,233 | 1.73% | 3q | +5.5%+$215.9K |
| Alpha Family Trust | $4.0M | 658,935 | 1.62% | 21q | HELD |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | $4.0M | 650,000 | 3.06% | 3q | +66.7%+$1.6M |
| HERALD INVESTMENT MANAGEMENT Ltd | $4.0M | 645,465 | 0.54% | 6q | HELD |
| Sphera Management Technology Funds Ltd | $3.8M | 615,000 | 1.32% | 7q | HELD |
| JANE STREET GROUP, LLC | $3.7M | 513,277 | 0.00% | 7q | +121.9%+$2.0M |
| CenterBook Partners LP | $3.7M | 599,737 | 0.18% | 8q | -54.7%-$4.4M |
| Lotus Technology Management, LP | $3.4M | 531,409 | 4.18% | new | NEW |
| PEAK6 LLC | $3.0M | 484,822 | 0.01% | 6q | +51.0%+$1.0M |
| Connor, Clark & Lunn Investment Management Ltd. | $2.7M | 445,691 | 0.01% | 10q | -16.5%-$539.1K |
| UBS Group AG | $2.5M | 403,328 | 0.00% | 15q | +103.1%+$1.3M |
| CITADEL ADVISORS LLC | $2.5M | 346,735 | 0.00% | 11q | -27.2%-$914.0K |
| MORGAN STANLEY | $1.6M | 268,203 | 0.00% | 21q | -54.7%-$2.0M |
| LAVELLE CAPITAL LP | $1.2M | 202,727 | 0.54% | 3q | HELD |
| Persistent Asset Partners Ltd | $1.1M | 180,000 | 0.33% | 3q | HELD |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | $1.0M | 169,885 | 0.02% | 2q | +35.2%+$271.3K |
| D. E. Shaw & Co., Inc. | $980.4K | 159,935 | 0.00% | 13q | +173.2%+$621.5K |
| ANTIPODES PARTNERS Ltd | $892.5K | 145,601 | 0.02% | new | NEW |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $848.5K | 138,417 | 0.00% | new | NEW |
| BlackRock, Inc. | $818.6K | 133,533 | 0.00% | 8q | +4.7%+$37.0K |
| TWO SIGMA INVESTMENTS, LP | $796.0K | 129,851 | 0.00% | 2q | +64.2%+$311.3K |
| GROUP ONE TRADING LLC | $760.7K | options only | 0.00% | new | OPTIONS |
| MYDA Advisors LLC | $613.0K | 100,000 | 0.09% | new | NEW |
| Pathstone Holdings, LLC | $609.3K | 99,390 | 0.00% | 11q | +97.2%+$300.4K |
| State of Wyoming | $542.2K | 88,458 | 0.05% | new | NEW |
| STATE STREET CORP | $472.3K | 77,054 | 0.00% | 12q | -29.6%-$198.3K |
| Quadrature Capital Ltd | $418.1K | 68,207 | 0.00% | 2q | -27.6%-$159.5K |
| IMC-Chicago, LLC | $395.4K | 37,506 | 0.00% | new | NEW |
| MARSHALL WACE, LLP | $373.8K | 60,981 | 0.00% | 21q | -90.4%-$3.5M |
| SIMPLEX TRADING, LLC | $317.9K | 33,066 | 0.00% | 6q | +1038.6%+$290.0K |
| Centiva Capital, LP | $281.5K | 45,919 | 0.00% | 2q | -23.6%-$87.1K |
| WealthTrust Axiom LLC | $273.2K | 44,565 | 0.06% | new | NEW |
| Qube Research & Technologies Ltd | $195.2K | 31,847 | 0.00% | 3q | -92.3%-$2.4M |
| LAZARD ASSET MANAGEMENT LLC | $144.5K | 23,566 | 0.00% | 8q | +109.9%+$75.6K |
| MILLENNIUM MANAGEMENT LLC | $111.6K | 18,198 | 0.00% | 14q | -97.8%-$5.0M |
| Integrated Wealth Concepts LLC | $92.0K | 15,000 | 0.00% | new | NEW |
| R Squared Ltd | $69.0K | 11,256 | 0.04% | new | NEW |
| XTX Topco Ltd | $66.9K | 10,906 | 0.00% | 2q | -95.2%-$1.3M |
| PRELUDE CAPITAL MANAGEMENT, LLC | $63.8K | 10,411 | 0.00% | new | NEW |
| PharVision Advisers, LLC | $63.6K | 10,368 | 1.20% | 3q | -45.2%-$52.5K |
| Olympiad Research LP | $63.4K | 10,337 | 0.13% | new | NEW |
| Cresset Asset Management, LLC | $62.2K | 10,144 | 0.00% | 2q | HELD |
| MARATHON CAPITAL MANAGEMENT | $61.3K | 10,000 | 0.01% | new | NEW |
| WELLS FARGO & COMPANY/MN | $56.4K | 9,200 | 0.00% | 19q | -43.9%-$44.1K |
| CITIGROUP INC | $46.0K | 7,511 | 0.00% | 21q | -93.2%-$629.3K |
| ROYAL BANK OF CANADA | $36.0K | 5,900 | 0.00% | 14q | +2850.0%+$34.8K |
| SBI Securities Co., Ltd. | $6.3K | 1,024 | 0.00% | 6q | HELD |
| BARCLAYS PLC | $4.2K | 690 | 0.00% | 13q | -93.5%-$60.8K |
| Tower Research Capital LLC (TRC) | $2.4K | 399 | 0.00% | new | NEW |
| OSAIC HOLDINGS, INC. | $1.8K | 300 | 0.00% | 9q | HELD |
| Quarry LP | $913 | 149 | 0.00% | new | NEW |
| GSA CAPITAL PARTNERS LLP | $588 | 95,899 | 0.04% | 2q | -37.0% |
| JONES FINANCIAL COMPANIES LLLP | $560 | 100 | 0.00% | 8q | HELD |
| Smartleaf Asset Management LLC | $179 | 29 | 0.00% | 3q | HELD |
| SG Americas Securities, LLC | $135 | 22,064 | 0.00% | new | NEW |
| Caitong International Asset Management Co., Ltd | $67 | 11 | 0.00% | 3q | -95.5%-$1.4K |
| ACADIAN ASSET MANAGEMENT LLC | $41 | 6,750 | 0.00% | 4q | -98.3%-$2.4K |
| FMR LLC | $37 | 6 | 0.00% | 15q | HELD |
| Farther Finance Advisors, LLC | $16 | 3 | 0.00% | new | NEW |
| Covestor Ltd | $0 | 0 | 0.00% | new | NEW |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 68 | $250.9M | 40,588,084 | 18 | 18 | 18 | 0.8% |
| Q1 2026 | 77 | $117.0M | 42,391,419 | 17 | 30 | 17 | 0.4% |
| Q4 2025 | 96 | $354.2M | 46,479,857 | 15 | 25 | 33 | 1.8% |
| Q3 2025 | 92 | $418.2M | 42,420,552 | 9 | 28 | 33 | 5.6% |
| Q2 2025 | 107 | $321.8M | 38,029,339 | 19 | 44 | 25 | 4.8% |
| Q1 2025 | 105 | $338.7M | 39,229,782 | 23 | 29 | 36 | 4.2% |
| Q4 2024 | 106 | $550.8M | 37,857,464 | 21 | 42 | 23 | 2.6% |
| Q3 2024 | 89 | $290.9M | 32,815,724 | 24 | 35 | 13 | 0.3% |
| Q2 2024 | 72 | $217.3M | 27,941,892 | 9 | 26 | 23 | 0.1% |
| Q1 2024 | 67 | $249.9M | 27,638,613 | 26 | 20 | 10 | 0.6% |
| Q4 2023 | 44 | $139.5M | 25,647,113 | 6 | 14 | 12 | 0.0% |
| Q3 2023 | 44 | $230.7M | 35,738,456 | 13 | 11 | 10 | 0.0% |
| Q2 2023 | 41 | $159.8M | 20,347,351 | 9 | 9 | 15 | 16.4% |
| Q1 2023 | 32 | $140.3M | 20,745,041 | 8 | 9 | 5 | 0.1% |
| Q4 2022 | 38 | $138.4M | 21,040,593 | 10 | 5 | 10 | 3.4% |
| Q3 2022 | 44 | $164.7M | 27,261,211 | 6 | 18 | 6 | 2.8% |
| Q2 2022 | 47 | $227.8M | 27,377,485 | 16 | 10 | 13 | 0.8% |
| Q1 2022 | 43 | $369.8M | 28,312,545 | 5 | 12 | 14 | 0.8% |
| Q4 2021 | 45 | $502.6M | 27,968,745 | 20 | 10 | 6 | 0.3% |
| Q3 2021 | 34 | $303.9M | 14,520,036 | 10 | 5 | 12 | 0.0% |
| Q2 2021 | 45 | $294.1M | 14,926,736 | 45 | 0 | 0 | 0.0% |