SIMILARWEB LTD (SMWB) Institutional Shareholders
SIMILARWEB LTD (SMWB) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $241.40M in SMWB holdings during the latest filing period.
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 $93.19M, representing an estimated gain of +36.05% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 77% 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
68
Total Reported Value
$241.40M
Largest Holder
Naspers Ltd
Largest Position
$68.49M
Insider Transactions (90d)
6
Latest Filing Quarter
Q2 2026
New Institutional Positions
130
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 | $93,185,030 | +$24,692,916 | +36.05% | |
| Menora Mivtachim Holdings Ltd. | 0.10% | 4,015,494 | $24,614,978 | $33,489,220 | +$8,874,242 | +36.05% | |
| Wellington Management Group Llp | 0.00% | 3,624,685 | $22,219,319 | $30,229,873 | +$8,010,554 | +36.05% | |
| Ion Crossover Partners Ltd | 24.88% | 3,030,826 | $18,578,963 | $25,277,089 | +$6,698,126 | +36.05% | |
| Ulysses Management Llc | 6.21% | 2,928,474 | $17,951,546 | $24,423,473 | +$6,471,927 | +36.05% | |
| S Squared Technology, Llc | 3.21% | 1,690,000 | $10,359,700 | $14,094,600 | +$3,734,900 | +36.05% | |
| Schonfeld Strategic Advisors Llc | 0.04% | 1,210,629 | $7,421,154 | $10,096,646 | +$2,675,492 | +36.05% | |
| Y.D. More Investments Ltd | 0.22% | 1,147,035 | $7,031,325 | $9,566,272 | +$2,534,947 | +36.05% | |
| ARK Invest | Cathie Wood | 0.03% | 834,663 | $5,116,484 | $6,961,089 | +$1,844,605 | +36.05% |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 713,728 | $4,375,153 | $5,952,492 | +$1,577,339 | +36.05% |
| Cdc Financial, Inc. | 3.18% | 674,233 | $4,133,048 | $5,623,103 | +$1,490,055 | +36.05% | |
| Alpha Family Trust | 1.62% | 658,935 | $4,039,272 | $5,495,518 | +$1,456,246 | +36.05% | |
| Nano Cap New Millennium Growth Fund L P | 3.06% | 650,000 | $3,984,500 | $5,421,000 | +$1,436,500 | +36.05% | |
| Herald Investment Management Ltd | 0.54% | 645,465 | $3,963,155 | $5,383,178 | +$1,420,023 | +35.83% | |
| Sphera Management Technology Funds Ltd | 1.32% | 615,000 | $3,769,950 | $5,129,100 | +$1,359,150 | +36.05% | |
| Centerbook Partners Lp | 0.18% | 599,737 | $3,676,388 | $5,001,807 | +$1,325,419 | +36.05% | |
| Lotus Technology Management, Lp | 4.18% | 531,409 | $3,403,907 | $4,431,951 | +$1,028,044 | +30.20% | |
| Jane Street Group, Llc | 0.00% | 513,277 | $3,146,388 | $4,280,730 | +$1,134,342 | +36.05% | |
| Peak6 Llc | 0.07% | 484,822 | $2,971,959 | $4,043,415 | +$1,071,456 | +36.05% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | 445,691 | $2,732,086 | $3,717,063 | +$984,977 | +36.05% | |
| Ubs Group Ag | 0.00% | 403,328 | $2,472,401 | $3,363,756 | +$891,355 | +36.05% | |
| Citadel Advisors Llc | 0.00% | 346,735 | $2,125,486 | $2,891,770 | +$766,284 | +36.05% | |
| Morgan Stanley | 0.00% | 268,203 | $1,644,084 | $2,236,813 | +$592,729 | +36.05% | |
| Lavelle Capital Lp | 0.63% | 202,727 | $1,242,717 | $1,690,743 | +$448,026 | +36.05% | |
| Persistent Asset Partners Ltd | 0.35% | 180,000 | $1,103,400 | $1,501,200 | +$397,800 | +36.05% | |
| Susquehanna Fundamental Investments, Llc | 0.02% | 169,885 | $1,041,395 | $1,416,841 | +$375,446 | +36.05% | |
| D. E. Shaw & Co., Inc. | 0.00% | 159,935 | $980,402 | $1,333,858 | +$353,456 | +36.05% | |
| Antipodes Partners Ltd | 0.02% | 145,601 | $892,534 | $1,214,312 | +$321,778 | +36.05% | |
| Susquehanna International Group, Llp | 0.00% | 138,417 | $848,496 | $1,154,398 | +$305,902 | +36.05% | |
| Blackrock, Inc. | 0.00% | 133,533 | $818,557 | $1,113,665 | +$295,108 | +36.05% | |
| Two Sigma Investments, Lp | 0.00% | 129,851 | $795,987 | $1,082,957 | +$286,970 | +36.05% | |
| Myda Advisors Llc | 0.15% | 100,000 | $613,000 | $834,000 | +$221,000 | +36.05% | |
| Gsa Capital Partners Llp | 0.04% | 95,899 | $588,000 | $799,798 | +$211,798 | +36.02% | |
| State Of Wyoming | 0.05% | 88,458 | $542,248 | $737,740 | +$195,492 | +36.05% | |
| State Street Corp | 0.00% | 77,054 | $472,341 | $642,630 | +$170,289 | +36.05% | |
| Quadrature Capital Ltd | 0.00% | 68,207 | $418,109 | $568,846 | +$150,737 | +36.05% | |
| Marshall Wace, Llp | 0.00% | 60,981 | $373,814 | $508,582 | +$134,768 | +36.05% | |
| Centiva Capital, Lp | 0.01% | 45,919 | $281,483 | $382,964 | +$101,481 | +36.05% | |
| Wealthtrust Axiom Llc | 0.06% | 44,565 | $273,182 | $371,672 | +$98,490 | +36.05% | |
| Imc-Chicago, Llc | 0.00% | 37,506 | $229,912 | $312,800 | +$82,888 | +36.05% | |
| Simplex Trading, Llc | 0.01% | 33,066 | $202,694 | $275,770 | +$73,076 | +36.05% | |
| Qube Research & Technologies Ltd | 0.00% | 31,847 | $195,222 | $265,604 | +$70,382 | +36.05% | |
| Lazard Asset Management Llc | 0.00% | 23,566 | $144,460 | $196,540 | +$52,080 | +36.05% | |
| Sg Americas Securities, Llc | 0.00% | 22,064 | $135,000 | $184,014 | +$49,014 | +36.31% | |
| Pathstone Holdings, Llc | 0.00% | 50,390 | $131,518 | $420,253 | +$288,735 | +219.54% | |
| Millennium Management Llc | 0.00% | 18,198 | $111,554 | $151,771 | +$40,217 | +36.05% | |
| Integrated Wealth Concepts Llc | 0.00% | 15,000 | $91,950 | $125,100 | +$33,150 | +36.05% | |
| R Squared Ltd | 0.04% | 11,256 | $68,999 | $93,875 | +$24,876 | +36.05% | |
| Xtx Topco Ltd | 0.00% | 10,906 | $66,854 | $90,956 | +$24,102 | +36.05% | |
| Prelude Capital Management, Llc | 0.00% | 10,411 | $63,819 | $86,828 | +$23,009 | +36.05% |
Frequently asked questions about SMWB
Who owns the most SMWB stock?
The largest holders of SMWB are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for SIMILARWEB LTD (SMWB).
Is SMWB widely held by superinvestors?
Many widely followed stocks like SMWB appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly SMWB is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.