How many institutional investors hold CSTL?

1 tracked institutional investor disclosed a position in CSTL (CASTLE BIOSCIENCES INC) in their most recent 13F filing.

Who is the largest institutional holder of CSTL?

Ken Griffin, Citadel Advisors, holds the largest disclosed position in CSTL, valued at $16M.

Where does this CSTL ownership data come from?

SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.

CSTL — CASTLE BIOSCIENCES INC

Name: CASTLE BIOSCIENCES INC (CSTL) — Institutional Ownership
Creator: InvestorLens
License: https://www.sec.gov/about/website-policies

Public company

For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About CASTLE BIOSCIENCES INC (CSTL)

CASTLE BIOSCIENCES INC (CSTL) appears in the most recent 13F filings of 1 tracked institutional investor. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $16M. Across recent filings, tracked investors recorded 1 new positions, 0 increased, 0 reduced, and 0 exited. All data sourced from SEC 13F filings.

Tracked investors reporting CSTL

Investor	Firm	Shares	Market value	% of portfolio	As of
Ken Griffin	Citadel Advisors	407K	$15.8M	0.01%	Dec 31, 2025

Ken GriffinDec 31, 2025
Citadel Advisors
Shares
407K
Value
$15.8M
% Portfolio
0.01%

Recent activity

Investor	Action	Δ %	Current value	Filing date
Ken Griffin	New	—	$6.5M	Nov 14, 2025

Ken Griffin
New
$6.5MNov 14, 2025

Frequently asked questions

How many institutional investors hold CSTL?: 1 tracked institutional investor disclosed a position in CSTL (CASTLE BIOSCIENCES INC) in their most recent 13F filing.
Who is the largest institutional holder of CSTL?: Ken Griffin, Citadel Advisors, holds the largest disclosed position in CSTL, valued at $16M.
Did institutional ownership of CSTL increase or decrease?: Across recent 13F filings, tracked investors recorded 1 new positions, 0 increased, 0 reduced, and 0 fully exited CSTL.
Where does this CSTL ownership data come from?: SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.