CASTLEARK MANAGEMENT LLC

Position in DGX — Quest Diagnostics Inc

CIK 1106832 CHICAGO, IL

Position in DGX

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

Position Value

$6,672,186

New position

Shares Held

31,480

first reported quarter

Ownership

0.029%

of shares outstanding

% of Portfolio

0.20%

of 13F equity value

Holder Rank

#211

of 1,090 holders

Holding Since

Jun 2026

1 quarter on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

CASTLEARK MANAGEMENT LLC holds $31,877,319 across 5 Diagnostics & Research names. DGX ranks #3 (20.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	GH	Guardant Health, Inc.	80,293	$12,046,358
2	CRL	Charles River Laboratories International, Inc.	36,045	$8,174,645
3	DGX	Quest Diagnostics Inc This page	31,480	$6,672,186
4	VCYT	Veracyte, Inc.	72,016	$4,229,499
5	NTRA	Natera, Inc.	2,780	$754,631

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$6,672,186	31,480	—	Shares	Sole	2026-08-14
No filing history on record for this holder in this stock.