Who owns SMWBWhat SMWB owns — n/a

Who owns SIMILARWEB LTD.?

Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.

Institutional ownership of SMWB from SEC Form 13F filings across 77 reporting managers. All positions are from one synchronized reporting period — 2026-03-31 books, filed up to 45 days after quarter end — so every row is comparable.

As of the 2026-03-31 reporting period, 77 institutions disclosed 40.8M shares of SIMILARWEB LTD. worth $103.1M; the largest disclosed holder is NASPERS LTD. Source: SEC Form 13F filings, parsed by EvidInvest.

13F holders

$103.1M

value, 2026 filers

40.8M

shares disclosed

new positions (2026 filers)

Top institutional holders

ordered by shares owned · positions as of 2026-03-31 · % of fund = share of the manager's own book · % of co. = share of SMWB's shares outstanding

#	Manager	Shares	Value	% of fund	% of co.	Δ shares QoQ
1	NASPERS LTD	11.2M	$29.2M	11.5%	—	—
2	MENORA MIVTACHIM HOLDINGS LTD.	4.0M	$10.5M	0.0%	—	—
3	ION Crossover Partners Ltd	3.0M	$7.9M	21.5%	—	—
4	Ulysses Management LLC	3.0M	$7.8M	1.0%	—	—
5	WELLINGTON MANAGEMENT GROUP LLP	3.0M	$7.7M	0.0%	—	—
6	Nuveen Asset Management, LLC	428,926	$6.1M	0.0%	—	—
7	S Squared Technology, LLC	1.6M	$4.2M	0.8%	—	—
8	CenterBook Partners LP	1.3M	$3.5M	0.2%	—	—
9	BlackRock Inc.	334,885	$2.6M	0.0%	—	—
10	NORTH RUN CAPITAL, LP	375,000	$2.4M	5.5%	—	—
11	Alpha Family Trust	658,935	$2.3M	1.1%	—	—
12	MILLENNIUM MANAGEMENT LLC	825,763	$2.2M	0.0%	—	—
13	RENAISSANCE TECHNOLOGIES LLC	739,673	$1.9M	0.0%	—	—
14	MARSHALL WACE, LLP	638,188	$1.7M	0.0%	—	—
15	Sphera Management Technology Funds Ltd	615,000	$1.6M	0.9%	—	—
16	MORGAN STANLEY	591,863	$1.5M	0.0%	—	—
17	Connor, Clark & Lunn Investment Management Ltd.	533,634	$1.4M	0.0%	—	—
18	CITADEL ADVISORS LLC	476,005	$1.2M	0.0%	—	—
19	Qube Research & Technologies Ltd	416,146	$1.1M	0.0%	—	—
20	WOLVERINE TRADING, LLC	112,300	$1.1M	0.0%	—	—
21	ACADIAN ASSET MANAGEMENT LLC	405,607	$1.1M	0.0%	—	—
22	NANO CAP NEW MILLENNIUM GROWTH FUND L P	390,000	$1.0M	1.0%	—	—
23	ARK Investment Management LLC	352,070	$918,903	0.0%	—	—
24	PEAK6 LLC	321,156	$838,217	0.0%	—	—
25	Schonfeld Strategic Advisors LLC	289,174	$754,743	0.0%	—	—

Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.