Companies / Castle Biosciences, Inc.

Castle Biosciences, Inc.

Nasdaq: CSTLCIK 1447362FRIENDSWOOD, TX
Insider flow · last 90 daysNet sells $375.4K

Financials · FY2025

Revenue$344.23M
Net income$-24.16M
Total debt$14.50M
Cash$62.12M
Diluted EPS$-0.83
Shares outstanding30.5M

Ownership

30.5M shares outstanding · as of Jul 23, 2026
91.4%Institutions
Ownership
Institutions91.37%27,913,528
Public float8.63%2,635,979

% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.

Insiders 7

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Insider% of sharesShares
Maetzold Derek JCEOFormerPres. & Chief Exec. Officer · Director
0.49%149,885
Juvenal Tobin WFormerChief Commercial Officer
0.28%86,825
Stokes FrankFormerChief Financial Officer
0.20%60,085
Oelschlager Kristen MFormerChief Operating Officer
0.13%39,047
Cole G BradleyFormerDirector
0.11%32,976
Bradbury DanielFormerDirector
0.07%22,340
Cotton RodneyFormerDirector
0.06%19,331

Institutional holders 206

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HolderValue% of shares
Vanguard Group Inc$85.57M7.20%
RTW Investments, LP$82.28M6.92%
BlackRock, Inc.$78.51M10.78%
Dimensional Fund Advisors LP$44.49M3.74%
Principal Financial Group Inc$43.45M5.79%
Summit Partners Public Asset Management, LLC$41.18M3.47%
Portolan Capital Management, LLC$33.15M4.42%
Allianz Asset Management GmbH$24.21M2.04%
Wasatch Advisors LP$20.90M1.76%
Nuveen, LLC$20.41M1.72%

Activity

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InsidersInstitutions
What insiders are doing in this stock (Form 4).
DateActorActionSecurityValueShares ΔPosition afterImpact
Mar 12, 2026Maetzold Derek J
CEO
SellCommon Stock$585.9K-23K
-24.47%
71,558
0.23% of shares
medium
Mar 12, 2026Juvenal Tobin W
Executive
SellCommon Stock$526.6K-21K
-19.37%
86,825
0.28% of shares
medium
Mar 3, 2026Maetzold Derek J
CEO
OtherCommon Stock$525.0K-19K
-22.75%
64,655
0.21% of shares
low
Mar 4, 2026Maetzold Derek J
CEO
OtherCommon Stock$505.1K-18K
-14.49%
105,821
0.35% of shares
low
Mar 17, 2026Maetzold Derek J
CEO
SellCommon Stock$483.6K-19K
-45.73%
22,129
0.07% of shares
medium
Mar 16, 2026Maetzold Derek J
CEO
SellCommon Stock$453.0K-17K
-29.90%
40,905
0.13% of shares
medium
Mar 11, 2026Maetzold Derek J
CEO
SellCommon Stock$451.9K-17K
-15.45%
94,737
0.31% of shares
medium
Mar 13, 2026Maetzold Derek J
CEO
SellCommon Stock$336.0K-13K
-18.45%
58,354
0.19% of shares
medium

5%+ ownership events

Schedule 13D / 13G
FilerStance% of classSharesDate
Vanguard Group IncPassive13G/A—0—
Dimensional Fund Advisors LPPassive13G/A———
RTW Investments, LPPassive13G———
Portolan Capital Management, LLCPassive13G/A———

Securities

via CUSIP / OpenFIGI
SymbolTypeMarketCUSIPFIGI
CSTL——14843C105—