InvestorLens

CSTL — CASTLE BIOSCIENCES INC

Public company

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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 4 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $16M. Across recent filings, tracked investors recorded 5 new positions, 0 increased, 0 reduced, and 0 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in CSTL

100
/100
Strong Institutional Accumulation
Added / Increased5
Reduced0
Exited0
BearishBullish
Crowded Trade Score™

How many top investors track CSTL

27
/100
Emerging Interest
4investors

A small number of top investors own this.

UndiscoveredCrowded
151015+

CSTL Ownership Composition

How CASTLE BIOSCIENCES INC is held across tracked investor types, based on reported 13F positions.

Dominant Type
Other
80% of tracked value
Institutions
4
tracked investors
Total Reported
$22.9M
combined 13F value
Sectors2
  • Other79.7%
  • Hedge Funds20.3%
Other(3)
79.7%
Hedge Funds(1)
20.3%

Tracked investors reporting CSTL

  • Ken GriffinMar 31, 2026
    Citadel Advisors
    Shares
    166K
    Value
    $4.1M
    % Portfolio
    0.00%
  • Izzy EnglanderMar 31, 2026
    Millennium Management
    Shares
    353.3K
    Value
    $8.7M
    % Portfolio
    0.00%
  • Paul Tudor JonesMar 31, 2026
    Tudor Investment Corp
    Shares
    223K
    Value
    $5.5M
    % Portfolio
    0.01%
  • Steve CohenDec 31, 2025
    Point72 Asset Management
    Shares
    119.5K
    Value
    $4.6M
    % Portfolio
    0.01%

Recent activity

Frequently asked questions

How many institutional investors hold CSTL?
4 tracked institutional investors 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 5 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.
CSTL (CASTLE BIOSCIENCES INC) — Institutional Holders & 13F — InvestorLens