SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC

Position in CSTL — Castle Biosciences Inc

CIK 1638555 Boston, MA

Position in CSTL

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$19,673,197

-$3,420,619 QoQ

Shares Held

824,872

-12.3% QoQ

Ownership

2.70%

of shares outstanding

% of Portfolio

0.51%

of 13F equity value

Holder Rank

of 176 holders

Holding Since

Sep 2025

4 quarters on record

Voting authority Sole 49% Shared 0% None 51%

Healthcare · as of Jun 30, 2026

SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC holds $270,450,827 across 3 Diagnostics & Research names. CSTL ranks #3 (7.3% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	GH	Guardant Health, Inc.	967,697	$145,183,580
2	NTRA	Natera, Inc.	389,000	$105,594,050
3	CSTL	Castle Biosciences Inc This page	824,872	$19,673,197

4 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$19,673,197	824,872	-12.3%	Shares	Sole	2026-08-14
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.