GROUP ONE TRADING LLC

Position in DGX — Quest Diagnostics Inc

CIK 932540 CHICAGO, IL

Position in DGX

as of Mar 31, 2026 · filed May 13, 2026 Compact

Position Value

$188,336

-$499,883 QoQ

Shares Held

961

-75.8% QoQ

Ownership

0.001%

of shares outstanding

% of Portfolio

0.01%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

12 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Healthcare · as of Mar 31, 2026

GROUP ONE TRADING LLC holds $8,605,509 across 14 Diagnostics & Research names. DGX ranks #6 (2.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	QGEN	Qiagen N.V.	71,010	$2,843,240
2	ILMN	Illumina, Inc.	15,677	$1,932,347
3	NTRA	Natera, Inc.	7,791	$1,558,122
4	TMO	Thermo Fisher Scientific Inc.	2,409	$1,184,095
5	DHR	Danaher Corp /De/	2,960	$561,216
6	DGX	Quest Diagnostics Inc This page	961	$188,336
7	ICLR	Icon PLC	1,555	$172,076
8	TWST	Twist Bioscience Corp	1,522	$72,325

12 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$188,336	961	-75.8%	Shares	Sole	2026-05-13
2025-12-31	$688,219	3,966	-10.1%	Shares	Sole	2026-02-12
2025-06-30	$792,707	4,413	+509.5%	Shares	Sole	2025-08-14
2025-03-31	$122,500	724	-66.7%	Shares	Sole	2025-05-14
2024-09-30	$337,047	2,171	+47.0%	Shares	Sole	2024-11-14
2024-06-30	$202,171	1,477	-63.4%	Shares	Sole	2024-08-14
2023-12-31	$556,897	4,039	+31.6%	Shares	Sole	2024-02-14
2023-09-30	$373,988	3,069	+29.7%	Shares	Sole	2023-11-09
2023-03-31	$334,741	2,366	-87.7%	Shares	Sole	2023-05-12
2021-06-30	$2,540,950	19,254	-1.2%	Shares	Sole	2021-08-10
2021-03-31	$2,501,731	19,493	+15.4%	Shares	Sole	2021-05-12
2020-03-31	$1,356,588	16,894	—	Shares	Sole	2020-05-13
No filing history on record for this holder in this stock.