WASATCH ADVISORS LP

Position in CSTL — Castle Biosciences Inc

CIK 814133 SALT LAKE CITY, UT

Back to CSTL Full portfolio

Position in CSTL

as of Jun 30, 2026 · filed Jul 10, 2026 Compact

Position Value

$6,662,473

-$4,508,660 QoQ

Shares Held

279,349

-38.6% QoQ

Ownership

0.921%

of shares outstanding

% of Portfolio

0.04%

of 13F equity value

Holder Rank

of 27 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in CSTL Over Time

Shares Held

Position Value (USD)

Position in Diagnostics & Research

Healthcare · as of Jun 30, 2026

WASATCH ADVISORS LP holds $421,872,903 across 5 Diagnostics & Research names. CSTL ranks #4 (1.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	MEDP	Medpace Holdings, Inc.	636,595	$337,134,346
2	BLLN	BillionToOne, Inc.	518,084	$62,159,718
3	ADPT	Adaptive Biotechnologies Corp	576,266	$12,360,905
4	CSTL	Castle Biosciences Inc This page	279,349	$6,662,473
5	DGX	Quest Diagnostics Inc	16,775	$3,555,461

All Filings in CSTL

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26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$6,662,473	279,349	-38.6%	Shares	Sole	2026-07-10
2026-03-31	$11,171,133	455,036	-15.3%	Shares	Sole	2026-04-21
2025-12-31	$20,898,674	537,241	-19.7%	Shares	Sole	2026-02-12
2025-09-30	$15,235,862	669,120	-36.3%	Shares	Sole	2025-11-14
2025-06-30	$21,436,364	1,049,773	+5.1%	Shares	Sole	2025-08-14
2025-03-31	$19,989,069	998,455	-44.4%	Shares	Sole	2025-05-15
2024-12-31	$47,865,745	1,796,088	-1.6%	Shares	Sole	2025-02-13
2024-09-30	$52,080,143	1,826,092	-21.6%	Shares	Sole	2024-11-14
2024-06-30	$50,679,166	2,327,936	-8.7%	Shares	Sole	2024-08-14
2024-03-31	$56,506,599	2,551,088	-1.5%	Shares	Sole	2024-04-18
2023-12-31	$55,912,722	2,590,951	-6.8%	Shares	Sole	2024-02-14
2023-09-30	$46,966,766	2,780,744	-9.9%	Shares	Sole	2023-11-14
2023-06-30	$42,353,653	3,087,001	+3.6%	Shares	Sole	2023-08-08
2023-03-31	$67,703,623	2,979,913	-7.5%	Shares	Sole	2023-05-12
2022-12-31	$75,859,109	3,222,562	-3.7%	Shares	Sole	2023-02-14
2022-09-30	$87,231,001	3,344,747	-9.7%	Shares	Sole	2022-11-14
2022-06-30	$81,336,120	3,705,518	+7.6%	Shares	Sole	2022-08-12
2022-03-31	$154,490,976	3,443,847	+10.5%	Shares	Sole	2022-05-13
2021-12-31	$133,603,840	3,116,488	+25.0%	Shares	Sole	2022-02-15
2021-09-30	$165,831,183	2,493,702	-0.4%	Shares	Sole	2021-11-12
2021-06-30	$183,684,170	2,504,898	+6.4%	Shares	Sole	2021-08-12
2021-03-31	$161,119,171	2,353,479	+14.0%	Shares	Sole	2021-05-10
2020-12-31	$138,653,401	2,064,831	+49.8%	Shares	Sole	2021-02-12
2020-09-30	$70,901,032	1,378,057	+26.2%	Shares	Sole	2020-11-10
2020-06-30	$41,149,263	1,091,782	+67.9%	Shares	Sole	2020-08-12
2020-03-31	$19,380,822	650,145	—	Shares	Sole	2020-05-08
No filing history on record for this holder in this stock.