Company · Ownership research

SIMILARWEB LTD. SMWB

CIK 0001842731 · CUSIP M84137104

Insider tradingInitial holdingsInstitutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP M84137104 (SMWB), not CUSIP M84137904 (SMWB), CUSIP M84137954 (SMWB), and does not merge CUSIPs.

This page lists the top 20 of 44 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	Viola Growth Management Fund 2 Ltd. CIK 1803169 · View history	$83.89M 10,810,778 shares	92.49%	+10.81MNew	SEC filing ↗ Nov 12, 2026	▾
02	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$13.14M 1,696,468 shares	0.02%	+1.69M(+25,032.90%)Added	SEC filing ↗ Nov 9, 2026	▾
03	Connor, Clark & Lunn Investment Management Ltd. CIK 1596800 · View history	$9.84M 1,267,716 shares	0.02%	+822.02K(+184.40%)Added	SEC filing ↗ Nov 10, 2026	▾
04	Y.D. More Investments Ltd CIK 1870364 · View history	$8.90M 1,147,035 shares	0.26%	0(0.00%)Unchanged	SEC filing ↗ Nov 2, 2026	▾
05	CenterBook Partners LP CIK 1872738 · View history	$6.84M 881,065 shares	0.31%	+281.33K(+46.90%)Added	SEC filing ↗ Nov 2, 2026	▾
06	JANE STREET GROUP, LLC CIK 1595888 · View history	$5.63M 725,831 shares	0.01%	+212.55K(+41.40%)Added	SEC filing ↗ Nov 12, 2026	▾
07	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$4.55M 586,296 shares	0.01%	-127.43K(-17.90%)Reduced	SEC filing ↗ Nov 12, 2026	▾
08	Alpha Family Trust CIK 1568991 · View history	$4.04M 658,935 shares	1.62%	0(0.00%)Unchanged	SEC filing ↗ Nov 4, 2026	▾
09	JPMORGAN CHASE & CO CIK 19617 · View history	$3.85M 500,118 shares	0.00%	+500.12KNew	SEC filing ↗ Nov 12, 2026	▾
10	Aberdeen Group plc CIK 1716774 · Amended · View history	$3.36M 432,466 shares	0.00%	+432.47KNew	SEC filing ↗ Nov 10, 2026	▾
11	BNP PARIBAS FINANCIAL MARKETS CIK 1166588 · View history	$2.05M 263,656 shares	0.00%	+263.66KNew	SEC filing ↗ Nov 12, 2026	▾
12	Y-Intercept (Hong Kong) Ltd CIK 1772875 · View history	$2.03M 261,713 shares	0.04%	+261.71KNew	SEC filing ↗ Oct 16, 2026	▾
13	KING LUTHER CAPITAL MANAGEMENT CORP CIK 310051 · View history	$1.82M 235,000 shares	0.01%	+235.00KNew	SEC filing ↗ Nov 5, 2026	▾
14	LAVELLE CAPITAL LP CIK 2136566 · View history	$1.63M 209,883 shares	0.88%	+7.16K(+3.50%)Added	SEC filing ↗ Nov 3, 2026	▾
15	UBS Group AG CIK 1610520 · View history	$1.39M 178,716 shares	0.00%	-224.61K(-55.70%)Reduced	SEC filing ↗ Nov 10, 2026	▾
16	State of Wyoming CIK 1821626 · View history	$917.00K 118,170 shares	0.07%	+29.71K(+33.60%)Added	SEC filing ↗ Oct 28, 2026	▾
17	STATE STREET CORP CIK 93751 · View history	$722.03K 93,045 shares	0.00%	+15.99K(+20.80%)Added	SEC filing ↗ Nov 12, 2026	▾
18	SIMPLEX TRADING, LLC CIK 1488542 · View history	$646.90K 83,364 shares	0.02%	+50.30K(+152.10%)Added	SEC filing ↗ Nov 4, 2026	▾
19	Squarepoint Ops LLC CIK 1642575 · View history	$503.61K 64,898 shares	0.00%	+64.90KNew	SEC filing ↗ Nov 9, 2026	▾
20	Semanteon Capital Management, LP CIK 1738809 · View history	$261.26K 33,668 shares	0.97%	+33.67KNew	SEC filing ↗ Nov 9, 2026	▾

Showing 20 / 44 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

20,406,550

Not deduplicated across managers

Disclosed value

$157.24M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

SIMILARWEB LTD. · Q3 2026

Explore all 44 reporting institutions.

This page includes 20 of 44 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.