Similarweb Ltd.
Similarweb Ltd. (SMWB) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · SMWB · as of Sep 30, 2025
Ownership Breakdown
107
Institutional Holders
▼ 16 vs Q2
$425.58M
Total Inst. Value
▲ $100.30M vs Q2
87.60M
Shares Outstanding
freeFloat 59.74%
45.72M
13F Shares Held
▲ 5.29M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
SMWB largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
NASPERS LTD services-computer programming, data processing, etc. | 11.17M | 13.30% | 13.30% | $103.91B | Nov 14, 2025 | — held |
MENORA MIVTACHIM HOLDINGS LTD. services-computer programming, data processing, etc. | 3.21M | 3.82% | 3.82% | $29.84B | Nov 13, 2025 | ▲ 881.7K |
MIGDAL INSURANCE & FINANCIAL HOLDINGS LTD. services-computer programming, data processing, etc. | 3.11M | 3.70% | 3.70% | $28.89B | Oct 30, 2025 | ▲ 100.0K |
ULYSSES MANAGEMENT LLC services-computer programming, data processing, etc. | 3.00M | 3.57% | 3.57% | $27.89B | Nov 14, 2025 | — held |
PHOENIX HOLDINGS LTD. services-computer programming, data processing, etc. | 2.99M | 3.56% | 3.56% | $27.84B | Nov 13, 2025 | ▲ 1.36M |
WELLINGTON MANAGEMENT GROUP LLP services-computer programming, data processing, etc. | 2.46M | 2.92% | 2.92% | $22.86B | Nov 14, 2025 | ▲ 1.53M |
PENN CAPITAL MANAGEMENT COMPANY, LLC services-computer programming, data processing, etc. | 1.65M | 1.96% | 1.96% | $15.32B | Nov 24, 2025 | ▲ 1.23M |
NUVEEN, LLC services-computer programming, data processing, etc. | 1.48M | 1.76% | 1.76% | $13.79B | Nov 12, 2025 | ▲ 185.8K |
Y.D. MORE INVESTMENTS LTD services-computer programming, data processing, etc. | 1.18M | 1.41% | 1.41% | $11.34B | Nov 10, 2025 | ▼ 51.5K |
CENTERBOOK PARTNERS LP services-computer programming, data processing, etc. | 1.18M | 1.41% | 1.41% | $10.98B | Nov 7, 2025 | ▼ 260.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
27
Increased
+8.55M shares3
New Positions
first time holders13
Decreased
−2.53M shares0
Sold Out
fully exitedNet shares change (top 50)
+6.02M
+8.55M / −2.53M
Net new holders
+17
3 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
SMWB insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
7
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Offer Or Chief Executive Officer | Jun 1, 2026 | Purchase | 50,000 | $4.15 | $207.5K | 4.74M | Form 4 ↗ |
Eilam Barak director | May 21, 2026 | Purchase | 50,000 | $3.86 | $193.0K | 101.3K | Form 4 ↗ |
Beit-On Harel Moshe director | May 20, 2026 | Purchase | 75,000 | $3.89 | $291.8K | 10.89M | Form 4 ↗ |
Offer Or Chief Executive Officer | May 19, 2026 | Purchase | 3,000 | $3.55 | $10.7K | 4.69M | Form 4 ↗ |
Offer Or Chief Executive Officer | May 19, 2026 | Purchase | 50,000 | $3.58 | $179.0K | 4.69M | Form 4 ↗ |
Offer Or Chief Executive Officer | May 18, 2026 | Purchase | 3,105 | $3.20 | $9.9K | 4.64M | Form 4 ↗ |
Rapaport-Dagim Tamar director | May 18, 2026 | Purchase | 40,000 | $3.22 | $128.9K | 63.6K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Similarweb Ltd. (SMWB) is primarily owned by institutional investors, who hold approximately 52.2% of total shares outstanding. Company insiders own approximately 40.26%, while retail and public investors account for the remaining 7.54%.
The largest institutional shareholder of Similarweb Ltd. is NASPERS LTD, holding approximately 11.17 million shares — equal to 13.30% of outstanding shares — as of September 30, 2025.
A total of 107 institutional investors currently hold SMWB stock, with a combined institutional value of approximately $425,584,367 as of the most recent 13F filing period.
Frequently asked questions
SMWB ownershipSimilarweb Ltd. (SMWB) is primarily owned by institutional investors, who hold approximately 52.2% of shares. The largest shareholder is NASPERS LTD with a 13.30% stake. Company insiders hold 40.26%. Data sourced from SEC Form 13F as of September 30, 2025.