Castle Biosciences (CSTL) Ownership - Who Owns Castle Biosciences?

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Castle Biosciences (CSTL) Ownership Overview

2.59% Insiders

24.32% Mutual Funds

29.56% Other Institutional Investors

13.84% ETFs

29.69% Public Companies and

Individual Investors

The ownership structure of Castle Biosciences (CSTL) stock is a mix of institutional, retail, and individual investors. Approximately 67.72% of the company’s stock is owned by Institutional Investors, 2.59% is owned by Insiders, and 29.69% is owned by Public Companies and Individual Investors.

The ownership structure of Castle Biosciences (CSTL) stock is a mix of institutional, retail, and individual investors. Approximately 53.89% of the company’s stock is owned by Institutional Investors, 2.59% is owned by Insiders, and 13.84% is owned by Public Companies and Individual Investors.

Recent Insider Trading Activity

Date	Name	Activity	Value
Mar 09, 2026	Bradley Cole	xxxxxxxxxxxxx	$210727
Dec 19, 2025	Kristen M Oelschlager	xxxxxxxxxxxxx	$585247
Dec 15, 2025	Tobin W Juvenal	xxxxxxxxxxxxx	$494736
Dec 15, 2025	Frank Stokes	xxxxxxxxxxxxx	$168375

Show More Insider Trading Activity >

Recent Hedge Fund Trading Activity

Date	Firm	Activity	Value
Dec 31, 2025	Graham Capital Management, L.p.	xxxxxxxxxxxxx	$425099

Show More Hedge Fund Trading Activity >

Top Shareholders

# of Shares	Type	% Holding	Value
1,498,471	Institution	5.04%	38,300,919
1,441,269	Institution	4.85%	36,838,836
1,139,651	Institution	3.83%	29,129,480
859,844	Institution	2.89%	21,977,613
858,236	Institution	2.89%	21,936,512
770,388	Institution	2.59%	19,691,117
572,916	Institution	1.93%	14,643,733
528,965	Institution	1.78%	13,520,345
426,626	Institution	1.43%	10,904,561
332,364	Institution	1.12%	8,495,224

Top Mutual Fund Holders

# of Shares	Type	% Holding	Value
1,139,651	Institution	3.83%	29,129,480
859,844	Institution	2.89%	21,977,613
858,236	Institution	2.89%	21,936,512
770,388	Institution	2.59%	19,691,117
572,916	Institution	1.93%	14,643,733
528,965	Institution	1.78%	13,520,345
426,626	Institution	1.43%	10,904,561
322,258	Institution	1.08%	8,236,914
305,000	Institution	1.03%	7,795,800
288,588	Institution	0.97%	7,376,309

Top ETF Holders

Holder	# of Shares	Type	% Holding	Value
Vanguard Total Stock Market ETF	823,964	Institution	2.77%	32,455,942
iShares Russell 2000 ETF	675,385	Institution	2.27%	17,262,841
Vanguard Extended Market ETF	315,723	Institution	1.06%	12,436,329
iShares Russell 2000 Value ETF	247,125	Institution	0.83%	6,316,515
iShares Biotechnology ETF	207,930	Institution	0.70%	5,314,691
Schwab U.S. Small-Cap ETF	140,634	Institution	0.47%	3,560,853
Vanguard Russell 2000 ETF	135,245	Institution	0.45%	5,327,301
EA Bridgeway Omni Small-Cap Value ETF	131,392	Institution	0.44%	3,326,845
Dimensional U.S. Targeted Value ETF	102,646	Institution	0.35%	2,598,997
Dimensional U.S. Small Cap ETF	95,385	Institution	0.32%	2,415,148

FAQ

Who Owns Castle Biosciences (CSTL)?

According to the latest TipRanks data, approximately 29.56% of the company's stock is held by institutional investors, 2.59% is held by insiders, and 29.69% is held by retail investors.

What percentage of Castle Biosciences (CSTL) stock is held by institutional investors?

According to the latest TipRanks data, approximately 29.56% of Castle Biosciences (CSTL) stock is held by institutional investors.

What percentage of Castle Biosciences (CSTL) stock is held by retail investors?

According to the latest TipRanks data, approximately 29.69% of Castle Biosciences (CSTL) stock is held by retail investors.

Who owns the most shares of Castle Biosciences (CSTL)?

iShares owns the most shares of Castle Biosciences (CSTL).

What is the significance of the ownership structure for a publicly traded company?

The ownership structure can impact the company's decision making, as large institutional investors may exert influence on the company's management and can also affect the company's stock price with their buying and selling patterns.