GROUP ONE TRADING LLC

Position in CRL — Charles River Laboratories International, Inc.

CIK 932540 CHICAGO, IL

Position in CRL

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

Position Value

$356,740

+$343,803 QoQ

Shares Held

1,573

+1997.3% QoQ

Ownership

0.003%

of shares outstanding

% of Portfolio

0.01%

of 13F equity value

Holder Rank

#341

of 569 holders

Holding Since

Dec 2021

16 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $17,681,744 across 13 Diagnostics & Research names. CRL ranks #4 (2.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	NTRA	Natera, Inc.	27,704	$7,520,250
2	DHR	Danaher Corp /De/	31,163	$5,935,928
3	ILMN	Illumina, Inc.	15,390	$2,706,023
4	CRL	Charles River Laboratories International, Inc. This page	1,573	$356,740
5	IQV	Iqvia Holdings Inc.	1,665	$321,711
6	TMO	Thermo Fisher Scientific Inc.	437	$219,094
7	GRAL	GRAIL, Inc.	2,326	$158,796
8	ICLR	Icon PLC	893	$155,123

16 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$356,740	1,573	+1997.3%	Shares	Sole	2026-08-14
2026-03-31	$12,937	75	-74.6%	Shares	Sole	2026-05-13
2025-12-31	$58,846	295	+123.5%	Shares	Sole	2026-02-12
2025-09-30	$20,652	132	-86.4%	Shares	Sole	2025-11-12
2025-06-30	$147,633	973	-90.9%	Shares	Sole	2025-08-14
2025-03-31	$1,611,467	10,706	+33.5%	Shares	Sole	2025-05-14
2024-12-31	$1,480,676	8,021	+39.8%	Shares	Sole	2025-05-14
2024-09-30	$1,129,819	5,736	+6203.3%	Shares	Sole	2024-11-14
2024-03-31	$24,656	91	+78.4%	Shares	Sole	2024-05-10
2023-12-31	$12,056	51	-96.3%	Shares	Sole	2024-02-14
2023-03-31	$276,897	1,372	-52.9%	Shares	Sole	2023-05-12
2022-12-31	$635,396	2,916	+3840.5%	Shares	Sole	2023-02-09
2022-09-30	$14,563	74	-63.4%	Shares	Sole	2022-11-09
2022-06-30	$43,221	202	-94.5%	Shares	Sole	2022-08-11
2022-03-31	$1,048,985	3,694	+167.1%	Shares	Sole	2022-05-12
2021-12-31	$521,086	1,383	—	Shares	Sole	2022-02-11
No filing history on record for this holder in this stock.