Who owns CSTLWhat CSTL owns — n/a

Who owns Castle Biosciences, Inc.?

Institutional ownership of CSTL from SEC Form 13F filings across 128 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.

128

13F holders

$416.4M

value, 2026 filers

60.8%

of shares outstanding (18.6M sh)

new positions (2026 filers)

Top institutional holders

ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of CSTL's shares outstanding

#	Manager	Shares	Value	% of fund	% of co.	Δ shares QoQ
1	BlackRock, Inc.	3.3M	$78.5M	0.0%	10.8%	+10.4%
2	PRINCIPAL FINANCIAL GROUP INC	1.7M	$41.2M	0.0%	5.7%	-2.4%
3	VANGUARD CAPITAL MANAGEMENT LLC	1.2M	$29.3M	0.0%	4%	-47.9%
4	ACADIAN ASSET MANAGEMENT LLC	918,668	$21,897	0.0%	3%	+89.6%
5	VANGUARD PORTFOLIO MANAGEMENT LLC	840,785	$20.1M	0.0%	2.8%	-2.4%
6	SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC	824,872	$19.7M	0.3%	2.7%	-12.3%
7	Allianz Asset Management GmbH	811,324	$19.9M	0.0%	2.7%	0.0%
8	GEODE CAPITAL MANAGEMENT, LLC	795,912	$19.0M	0.0%	2.6%	+9.3%
9	MACKENZIE FINANCIAL CORP	793,507	$18.9M	0.0%	2.6%	+970.7%
10	Qube Research & Technologies Ltd	589,300	$14.1M	0.0%	1.9%	+5.3%
11	GOLDMAN SACHS GROUP INC	358,397	$8.5M	0.0%	1.2%	+5.0%
12	Point72 Asset Management, L.P.NEW	357,317	$8.5M	0.0%	1.2%	new
13	Connor, Clark & Lunn Investment Management Ltd.	331,727	$7.9M	0.0%	1.1%	-12.0%
14	MORGAN STANLEY	329,684	$7.9M	0.0%	1.1%	-23.1%
15	Allspring Global Investments Holdings, LLC	292,470	$7.0M	0.0%	1%	+82.0%
16	NORTHERN TRUST CORP	285,158	$6.8M	0.0%	0.9%	+4.4%
17	CITADEL ADVISORS LLC	265,353	$6.3M	0.0%	0.9%	+119.3%
18	KORNITZER CAPITAL MANAGEMENT INC /KS	264,235	$6.3M	0.1%	0.9%	-0.1%
19	SILVERCREST ASSET MANAGEMENT GROUP LLC	256,095	$6.1M	0.0%	0.8%	-4.6%
20	Sixth Street Partners Management Company, L.P.NEW	254,535	$6.1M	1.0%	0.8%	new
21	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	254,535	$6.1M	0.0%	0.8%	+5.2%
22	NEW YORK STATE COMMON RETIREMENT FUND	234,746	$5.6M	0.0%	0.8%	+0.7%
23	Nuveen, LLC	231,726	$5.5M	0.0%	0.8%	-55.6%
24	MILLENNIUM MANAGEMENT LLC	205,369	$4.9M	0.0%	0.7%	-41.9%
25	VANGUARD FIDUCIARY TRUST CO	197,494	$4.7M	0.0%	0.6%	+4.9%

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.