GROUP ONE TRADING LLC

Position in MREO — Mereo BioPharma Group plc

CIK 932540 CHICAGO, IL

Position in MREO

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

Position Value

$53,269

-$57,553 QoQ

Shares Held

167,515

-50.1% QoQ

Ownership

0.105%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#18

of 58 holders

Holding Since

Jun 2021

14 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $113,693,049 across 200 Biotechnology names. MREO ranks #90 (0.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	MRNA	Moderna, Inc.	203,915	$14,280,167
2	VKTX	Viking Therapeutics, Inc.	261,443	$10,198,891
3	CAPR	Capricor Therapeutics, Inc.	272,609	$6,564,424
4	ABSI	Absci Corp	524,747	$6,081,817
5	AGIO	Agios Pharmaceuticals, Inc.	151,994	$5,640,497
6	NKTR	Nektar Therapeutics	70,371	$4,912,599
7	CRSP	CRISPR Therapeutics AG	85,040	$4,638,081
8	ABVX	Abivax S.A.	29,767	$3,966,750

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$53,269	167,515	-50.1%	Shares	Sole	2026-08-14
2026-03-31	$110,822	335,827	-24.0%	Shares	Sole	2026-05-13
2025-12-31	$184,162	441,636	+223.3%	Shares	Sole	2026-02-12
2025-09-30	$281,371	136,588	-2.1%	Shares	Sole	2025-11-12
2025-06-30	$378,204	139,559	+307.1%	Shares	Sole	2025-08-14
2025-03-31	$77,132	34,281	+321.7%	Shares	Sole	2025-05-14
2023-03-31	$5,747	8,130	-82.0%	Shares	Sole	2023-05-12
2022-12-31	$33,805	45,074	-27.2%	Shares	Sole	2023-02-09
2022-09-30	$53,285	61,888	+28.1%	Shares	Sole	2022-11-09
2022-06-30	$54,097	48,301	+158.4%	Shares	Sole	2022-08-11
2022-03-31	$20,937	18,694	+2.2%	Shares	Sole	2022-05-12
2021-12-31	$29,270	18,294	+378.1%	Shares	Sole	2022-02-11
2021-09-30	$9,258	3,826	-66.5%	Shares	Sole	2021-11-12
2021-06-30	$36,220	11,426	—	Shares	Sole	2021-08-10
No filing history on record for this holder in this stock.