GROUP ONE TRADING LLC

Position in ATYR — aTYR PHARMA INC

CIK 932540 CHICAGO, IL

Position in ATYR

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

Position Value

$82,910

-$60,620 QoQ

Shares Held

138,878

-24.5% QoQ

Ownership

0.142%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#25

of 90 holders

Holding Since

Mar 2020

16 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. ATYR ranks #81 (0.1% 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

16 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$82,910	138,878	-24.5%	Shares	Sole	2026-08-14
2026-03-31	$143,530	184,014	-3.7%	Shares	Sole	2026-05-13
2025-12-31	$149,590	191,048	+1008.2%	Shares	Sole	2026-02-12
2025-09-30	$12,430	17,240	-75.6%	Shares	Sole	2025-11-12
2025-06-30	$358,788	70,767	-21.1%	Shares	Sole	2025-08-14
2025-03-31	$270,806	89,671	+1138.5%	Shares	Sole	2025-05-14
2024-12-31	$26,208	7,240	-49.9%	Shares	Sole	2025-05-14
2022-09-30	$43,383	14,461	+156.0%	Shares	Sole	2022-11-09
2022-06-30	$15,983	5,648	+179.3%	Shares	Sole	2022-08-11
2021-09-30	$18,359	2,022	+4602.3%	Shares	Sole	2021-11-12
2021-06-30	$209	43	0.0%	Shares	Sole	2021-08-10
2021-03-31	$191	43	0.0%	Shares	Sole	2021-05-12
2020-12-31	$166	43	0.0%	Shares	Sole	2021-02-10
2020-09-30	$138	43	0.0%	Shares	Sole	2020-11-12
2020-06-30	$190	43	0.0%	Shares	Sole	2020-08-13
2020-03-31	$120	43	—	Shares	Sole	2020-05-13
No filing history on record for this holder in this stock.