SIMILARWEB LTD. (SMWB) — Institutional Holders, Q2 2026
71 institutional investment managers reported a SMWB position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $312.1M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
SMWB in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- Schonfeld Strategic AdvisorsAdded · +921,455 sh+$5.6M
- WELLINGTON MANAGEMENT GROUP LLPAdded · +657,928 sh+$4.0M
- Lotus Technology ManagementNew · +531,409 sh+$3.3M
- ARK Investment ManagementAdded · +482,593 sh+$3.0M
- JANE STREET GROUPAdded · +282,011 sh+$1.7M
Biggest sellers
- MILLENNIUM MANAGEMENTTrimmed · -807,565 sh-$5.0M
- MIRABELLA FINANCIAL SERVICES LLPSold out · -792,664 sh-$4.9M
- CenterBook PartnersTrimmed · -725,376 sh-$4.4M
- MARSHALL WACE, LLPTrimmed · -577,207 sh-$3.5M
- ACADIAN ASSET MANAGEMENTTrimmed · -398,857 sh-$2.4M
SMWB 13F holders ranked 1–71 of 71
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | NASPERS LTD#1 · 11,173,265 sh | 11,173,265 | $68.5M | 81.19% | 0.0% |
| 2 | Viola Growth Management Fund 2 Ltd.#2 · 10,810,778 sh | 10,810,778 | $66.3M | 88.48% | — |
| 3 | MENORA MIVTACHIM LTD.#3 · 4,015,494 sh | 4,015,494 | $24.6M | 0.10% | 0.0% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP#4 · 3,624,685 sh | 3,624,685 | $22.2M | <0.01% | +22.2% |
| 5 | ION Crossover Partners Ltd#5 · 3,030,826 sh | 3,030,826 | $18.6M | 24.88% | 0.0% |
| 6 | Ulysses Management#6 · 2,928,474 sh | 2,928,474 | $18.0M | 3.55% | -2.3% |
| 7 | S Squared Technology#7 · 1,690,000 sh | 1,690,000 | $10.4M | 3.21% | +5.6% |
| 8 | Schonfeld Strategic Advisors#8 · 1,210,629 sh | 1,210,629 | $7.4M | 0.03% | +318.7% |
| 9 | Y.D. More Investments Ltd#9 · 1,147,035 sh | 1,147,035 | $7.0M | 0.22% | -0.4% |
| 10 | ARK Investment Management#10 · 834,663 sh | 834,663 | $5.1M | 0.03% | +137.1% |
| 11 | RENAISSANCE TECHNOLOGIES#11 · 713,728 sh | 713,728 | $4.4M | <0.01% | -3.5% |
| 12 | CDC Financial#12 · 674,233 sh | 674,233 | $4.1M | 1.73% | +5.5% |
| 13 | Alpha Family#13 · 658,935 sh | 658,935 | $4.0M | 1.62% | 0.0% |
| 14 | NANO CAP NEW MILLENNIUM GROWTH FUND L P#14 · 650,000 sh | 650,000 | $4.0M | 3.06% | +66.7% |
| 15 | Herald Investment Management Ltd#15 · 645,465 sh | 645,465 | $4.0M | — | 0.0% |
| 16 | P.A.W. CAPITAL#16 · 640,000 sh | 640,000 | $3.9M | 2.95% | +28.0% |
| 17 | Sphera Management Technology Funds Ltd#17 · 615,000 sh | 615,000 | $3.8M | 1.32% | 0.0% |
| 18 | CenterBook Partners#18 · 599,737 sh | 599,737 | $3.7M | 0.18% | -54.7% |
| 19 | Lotus Technology Management#19 · 531,409 sh | 531,409 | $3.4M | 4.18% | New |
| 20 | JANE STREET GROUP#20 · 513,277 sh | 513,277 | $3.1M | <0.01% | +121.9% |
| 21 | PEAK6#21 · 484,822 sh | 484,822 | $3.0M | <0.01% | +51.0% |
| 22 | Connor, Clark & Lunn Investment Management Ltd.#22 · 445,691 sh | 445,691 | $2.7M | <0.01% | -16.5% |
| 23 | UBS Group AG#23 · 403,328 sh | 403,328 | $2.5M | <0.01% | +103.1% |
| 24 | CITADEL ADVISORS#24 · 346,735 sh | 346,735 | $2.1M | <0.01% | -27.2% |
| 25 | MORGAN STANLEY#25 · 268,203 sh | 268,203 | $1.6M | <0.01% | -54.7% |
| 26 | LAVELLE CAPITAL#26 · 202,727 sh | 202,727 | $1.2M | 0.54% | 0.0% |
| 27 | Persistent Asset Partners Ltd#27 · 180,000 sh | 180,000 | $1.1M | 0.33% | 0.0% |
| 28 | SUSQUEHANNA FUNDAMENTAL INVESTMENTS#28 · 169,885 sh | 169,885 | $1.0M | 0.02% | +35.2% |
| 29 | D. E. Shaw#29 · 159,935 sh | 159,935 | $980.4K | <0.01% | +173.2% |
| 30 | ANTIPODES PARTNERS Ltd#30 · 145,601 sh | 145,601 | $892.5K | 0.02% | New |
| 31 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#31 · 138,417 sh | 138,417 | $848.5K | <0.01% | New |
| 32 | BlackRock#32 · 133,533 sh | 133,533 | $818.6K | 0.00% | +4.7% |
| 33 | TWO SIGMA INVESTMENTS#33 · 129,851 sh | 129,851 | $796.0K | <0.01% | +64.2% |
| 34 | MYDA Advisors#34 · 100,000 sh | 100,000 | $613.0K | 0.09% | New |
| 35 | Pathstone#35 · 99,390 sh | 99,390 | $609.3K | <0.01% | +97.2% |
| 36 | GSA CAPITAL PARTNERS LLP#36 · 95,899 sh | 95,899 | $588.0K | 0.04% | -37.0% |
| 37 | State of Wyoming#37 · 88,458 sh | 88,458 | $542.2K | 0.05% | New |
| 38 | STATE STREET#38 · 77,054 sh | 77,054 | $472.3K | 0.00% | -29.6% |
| 39 | Quadrature Capital Ltd#39 · 68,207 sh | 68,207 | $418.1K | <0.01% | -27.6% |
| 40 | MARSHALL WACE, LLP#40 · 60,981 sh | 60,981 | $373.8K | <0.01% | -90.4% |
| 41 | Centiva Capital#41 · 45,919 sh | 45,919 | $281.5K | <0.01% | -23.6% |
| 42 | WealthTrust Axiom#42 · 44,565 sh | 44,565 | $273.2K | 0.06% | New |
| 43 | IMC-Chicago#43 · 37,506 sh | 37,506 | $229.9K | <0.01% | New |
| 44 | SIMPLEX TRADING#44 · 33,066 sh | 33,066 | $202.7K | <0.01% | +1038.6% |
| 45 | Qube Research & Technologies Ltd#45 · 31,847 sh | 31,847 | $195.2K | <0.01% | -92.3% |
| 46 | LAZARD ASSET MANAGEMENT#46 · 23,566 sh | 23,566 | $144.5K | <0.01% | +109.9% |
| 47 | SG Americas Securities#47 · 22,064 sh | 22,064 | $135.0K | <0.01% | New |
| 48 | MILLENNIUM MANAGEMENT#48 · 18,198 sh | 18,198 | $111.6K | 0.00% | -97.8% |
| 49 | Integrated Wealth Concepts#49 · 15,000 sh | 15,000 | $92.0K | <0.01% | New |
| 50 | R Squared Ltd#50 · 11,256 sh | 11,256 | $69.0K | 0.04% | New |
| 51 | XTX Topco Ltd#51 · 10,906 sh | 10,906 | $66.9K | <0.01% | -95.2% |
| 52 | PRELUDE CAPITAL MANAGEMENT#52 · 10,411 sh | 10,411 | $63.8K | <0.01% | New |
| 53 | PharVision Advisers#53 · 10,368 sh | 10,368 | $63.6K | 1.20% | -45.2% |
| 54 | Olympiad Research#54 · 10,337 sh | 10,337 | $63.4K | 0.13% | New |
| 55 | Cresset Asset Management#55 · 10,144 sh | 10,144 | $62.2K | <0.01% | 0.0% |
| 56 | MARATHON CAPITAL MANAGEMENT#56 · 10,000 sh | 10,000 | $61.3K | — | New |
| 57 | WELLS FARGO & COMPANY#57 · 9,200 sh | 9,200 | $56.4K | 0.00% | +12.2% |
| 58 | CITIGROUP#58 · 7,511 sh | 7,511 | $46.0K | 0.00% | -93.2% |
| 59 | ACADIAN ASSET MANAGEMENT#59 · 6,750 sh | 6,750 | $41.0K | 0.00% | -98.3% |
| 60 | ROYAL BANK OF CANADA#60 · 5,900 sh | 5,900 | $36.0K | 0.00% | +2850.0% |
| 61 | SBI Securities , Ltd.#61 · 1,024 sh | 1,024 | $6.3K | — | 0.0% |
| 62 | BARCLAYS PLC#62 · 690 sh | 690 | $4.2K | 0.00% | -93.5% |
| 63 | Tower Research Capital (TRC)#63 · 399 sh | 399 | $2.4K | <0.01% | New |
| 64 | OSAIC#64 · 300 sh | 300 | $1.8K | 0.00% | 0.0% |
| 65 | Quarry#65 · 149 sh | 149 | $913.00 | <0.01% | New |
| 66 | JONES FINANCIAL COMPANIES LLLP#66 · 100 sh | 100 | $560.00 | 0.00% | 0.0% |
| 67 | Smartleaf Asset Management#67 · 29 sh | 29 | $179.00 | 0.00% | 0.0% |
| 68 | Caitong International Asset Management , Ltd#68 · 11 sh | 11 | $67.00 | 0.00% | -95.5% |
| 69 | FMR#69 · 6 sh | 6 | $37.00 | 0.00% | 0.0% |
| 70 | Farther Finance Advisors#70 · 3 sh | 3 | $16.00 | — | New |
| 71 | Covestor Ltd#71 · 0 sh | 0 | $0.00 | 0.00% | New |
Funds that sold out of SMWB in Q2 2026 (27)
Held SMWB at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| MIRABELLA FINANCIAL SERVICES LLP792,664 sh | 792,664 | $2.1M |
| Penn Capital Management Company360,366 sh | 360,366 | $940.6K |
| Militia Capital Management219,264 sh | 219,264 | $572.3K |
| Phoenix Financial Ltd.216,904 sh | 216,904 | $566.1K |
| JPMORGAN CHASE175,207 sh | 175,207 | $434.5K |
| Jump Financial147,616 sh | 147,616 | $385.3K |
| Palogic Value Management, L.P.114,000 sh | 114,000 | $297.5K |
| Point72 Asset Management, L.P.100,204 sh | 100,204 | $261.5K |
| OPPENHEIMER91,088 sh | 91,088 | $237.7K |
| Voleon Capital Management88,704 sh | 88,704 | $231.5K |
| Engineers Gate Manager87,418 sh | 87,418 | $228.2K |
| FEDERATED HERMES70,000 sh | 70,000 | $182.7K |
| BANK OF AMERICA63,985 sh | 63,985 | $167.0K |
| Toroso Investments61,626 sh | 61,626 | $160.8K |
| AXQ CAPITAL52,410 sh | 52,410 | $136.8K |
| Russell Investments Group, Ltd.52,019 sh | 52,019 | $129.0K |
| GOLDMAN SACHS GROUP42,643 sh | 42,643 | $111.3K |
| Graham Capital Management, L.P.36,634 sh | 36,634 | $95.6K |
| HRT FINANCIAL22,670 sh | 22,670 | $59.0K |
| Virtu Financial20,111 sh | 20,111 | $52.0K |
| NEW YORK STATE COMMON RETIREMENT FUND18,774 sh | 18,774 | $49.0K |
| Aquatic Capital Management18,008 sh | 18,008 | $47.0K |
| Squarepoint Ops13,020 sh | 13,020 | $34.0K |
| MEITAV INVESTMENT HOUSE LTD10,000 sh | 10,000 | $26.1K |
| BNP PARIBAS FINANCIAL MARKETS890 sh | 890 | $2.3K |
| ASSETMARK48 sh | 48 | $125.00 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT12 sh | 12 | $31.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.