Similarweb Ltd (SMWB) Ownership
SMWB ownership summary
as of October 18, 2026- Institutions
- 69.8% of shares outstanding
- Insiders
- 16.04% of shares outstanding
- Shares outstanding
- 88.2M
- Float
- 42.7M shares available to trade
- Short interest
- 1.35% 731K shares short
- Days to cover
- 1.25 short interest up 14.0% vs prior month
- Institutions 69.83%
- Insiders 16.04%
- Other investors 14.13%
SMWB top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Naspers Ltd | 12.66% | 11.2M | $93.3M | — | June 30, 2026 |
| 2 | MENORA MIVTACHIM HOLDINGS LIMITED | 4.55% | 4.0M | $33.5M | — | June 30, 2026 |
| 3 | Wellington Management Company LLP | 4.11% | 3.6M | $30.3M | +657,928 (+22.2%) | June 30, 2026 |
| 4 | ION Crossover Partners Ltd | 3.43% | 3.0M | $25.3M | — | June 30, 2026 |
| 5 | Ulysses Management LLC | 3.32% | 2.9M | $24.5M | −70,000 (−2.3%) | June 30, 2026 |
| 6 | S Squared Technology, LLC | 1.92% | 1.7M | $14.1M | +90,000 (+5.6%) | June 30, 2026 |
| 7 | Schonfeld Strategic Advisors LLC | 1.37% | 1.2M | $10.1M | +921,455 (+318.7%) | June 30, 2026 |
| 8 | Y.D. More Investments Ltd | 1.30% | 1.1M | $9.6M | −4,263 (−0.4%) | June 30, 2026 |
| 9 | ARK Investment Management LLC | 0.95% | 835K | $7.0M | +482,593 (+137.1%) | June 30, 2026 |
| 10 | Renaissance Technologies Corp | 0.81% | 714K | $6.0M | −25,945 (−3.5%) | June 30, 2026 |
| 11 | CDC Financial, Inc. | 0.76% | 674K | $5.6M | +35,219 (+5.5%) | June 30, 2026 |
| 12 | Alpha Family Trust | 0.75% | 659K | $5.5M | — | June 30, 2026 |
| 13 | NANO CAP NEW MILLENNIUM GROWTH FUND L P | 0.74% | 650K | $5.4M | +260,000 (+66.7%) | June 30, 2026 |
| 14 | Herald Investment Management Ltd | 0.73% | 645K | $5.4M | — | June 30, 2026 |
| 15 | P.a.w. Capital Corp | 0.73% | 640K | $5.3M | +140,000 (+28.0%) | June 30, 2026 |
| 16 | Sphera Management Technology Funds Ltd | 0.70% | 615K | $5.1M | — | June 30, 2026 |
| 17 | CenterBook Partners LP | 0.68% | 600K | $5.0M | −725,376 (−54.7%) | June 30, 2026 |
| 18 | Lotus Technology Management, LP | 0.60% | 531K | $4.4M | +531,409 (0.0%) | June 30, 2026 |
| 19 | Jane Street Group LLC | 0.58% | 513K | $4.3M | +282,011 (+121.9%) | June 30, 2026 |
| 20 | Connor Clark & Lunn Inv Mgmt Ltd | 0.51% | 446K | $3.7M | −87,943 (−16.5%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 3.4M shares and 5 cut 914K.
SMWB top mutual fund and ETF holders
14 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard International Explorer Inv | 1.25% | 1.1M | $9.2M | +191,211 (+20.9%) | June 30, 2026 |
| 2 | Heptagon Driehaus US Micro Cap Eq C$ Acc | 1.20% | 1.1M | $8.8M | +157,841 (+17.5%) | August 31, 2026 |
| 3 | Herald Ord | 0.73% | 645K | $5.4M | — | March 31, 2026 |
| 4 | Driehaus Micro Cap Growth USD | 0.41% | 361K | $3.0M | +361,200 (0.0%) | July 31, 2026 |
| 5 | ARK Israel Innovative Technology ETF | 0.35% | 308K | $2.6M | — | September 30, 2026 |
| 6 | iShares Core MSCI EAFE ETF | 0.30% | 268K | $2.2M | +268,402 (0.0%) | February 26, 2026 |
| 7 | Nationwide International Sm Cp R6 | 0.25% | 221K | $1.8M | −82,582 (−27.2%) | August 31, 2026 |
| 8 | Adara Smaller Companies | 0.23% | 206K | $1.7M | +30,638 (+17.5%) | August 31, 2026 |
| 9 | SEI World Equity Ex-US A (SIIT) | 0.18% | 155K | $1.3M | +81,559 (+111.0%) | September 30, 2026 |
| 10 | VALIC Company I International Opps | 0.11% | 98K | $815,670 | −44,736 (−31.4%) | August 31, 2026 |
| 11 | State Street® SPDR® S&P® Intl Sm Cp ETF | 0.11% | 93K | $776,926 | — | September 30, 2026 |
| 12 | SEI International Equity F (SIT) | 0.07% | 64K | $538,341 | +4,531 (+7.6%) | September 30, 2026 |
| 13 | Destinations Small-Mid Cap Equity I | 0.07% | 58K | $488,258 | −3,226 (−5.2%) | September 30, 2026 |
| 14 | Avantis International Small Cp Eq ETF | <0.01% | 108 | $902 | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
SMWB shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns SMWB
Institutional investors own 69.8% of Similarweb's shares and insiders 16.04%. The largest holder is Naspers Ltd with 12.66% of the shares (11.2M), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 5 reduced their stake in the latest filings. Short interest is 1.35% of the float, or 1.25 days of average trading volume. The share count rose 566.3% since 2019.
Related: SMWB analyst forecast, SMWB key metrics. See the SMWB stock overview for the latest quote and news.
SMWB ownership FAQ
Who owns the most Similarweb stock?
The largest shareholders of Similarweb are Naspers Ltd (12.66%), MENORA MIVTACHIM HOLDINGS LIMITED (4.55%), Wellington Management Company LLP (4.11%), ION Crossover Partners Ltd (3.43%), Ulysses Management LLC (3.32%).
What percentage of Similarweb is owned by institutions?
Institutions hold 69.8% of Similarweb's shares outstanding; insiders hold 16.04%.
Which funds own Similarweb?
The largest fund holders of Similarweb are Vanguard International Explorer Inv (1.25%), Heptagon Driehaus US Micro Cap Eq C$ Acc (1.20%), Herald Ord (0.73%), Driehaus Micro Cap Growth USD (0.41%), ARK Israel Innovative Technology ETF (0.35%).
What is Similarweb's short interest?
731K shares of Similarweb were sold short, 1.35% of the float; at the average daily volume it would take 1.25 days to cover.
How many shares of Similarweb are outstanding?
Similarweb has 88.2M shares outstanding, of which 42.7M are in the public float.