SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC

Position in CSTL — Castle Biosciences Inc

CIK 1638555 Boston, MA

Position in CSTL

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$23,093,816

-$18,090,586 QoQ

Shares Held

940,685

-11.1% QoQ

Ownership

3.10%

of shares outstanding

% of Portfolio

1.07%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Sep 2025

3 quarters on record

Voting authority Sole 56% Shared 0% None 44%

Healthcare · as of Mar 31, 2026

SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC holds $207,906,380 across 4 Diagnostics & Research names. CSTL ranks #4 (11.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	GH	Guardant Health, Inc.	862,915	$79,707,458
2	NTRA	Natera, Inc.	371,603	$74,316,883
3	WGS	GeneDx Holdings Corp.	479,418	$30,788,223
4	CSTL	Castle Biosciences Inc This page	940,685	$23,093,816

3 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$23,093,816	940,685	-11.1%	Shares	Sole	2026-05-15
2025-12-31	$41,184,402	1,058,725	+164.7%	Shares	Sole	2026-02-17
2025-09-30	$9,108,000	400,000	—	Shares	Sole	2025-11-14
No filing history on record for this holder in this stock.