GROUP ONE TRADING LLC

Position in ALEC — Alector, Inc.

CIK 932540 CHICAGO, IL

Position in ALEC

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

Position Value

$50,668

-$15,402 QoQ

Shares Held

25,208

+12.9% QoQ

Ownership

0.023%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#87

of 140 holders

Holding Since

Sep 2020

13 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. ALEC ranks #92 (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

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$50,668	25,208	+12.9%	Shares	Sole	2026-08-14
2025-09-30	$66,070	22,321	+1016.1%	Shares	Sole	2025-11-12
2024-09-30	$9,320	2,000	0.0%	Shares	Sole	2024-11-14
2024-06-30	$9,080	2,000	+54.1%	Shares	Sole	2024-08-14
2022-09-30	$12,279	1,298	-31.6%	Shares	Sole	2022-11-09
2022-06-30	$19,283	1,898	-96.9%	Shares	Sole	2022-08-11
2022-03-31	$883,471	61,998	+31212.1%	Shares	Sole	2022-05-12
2021-12-31	$4,088	198	-99.1%	Shares	Sole	2022-02-11
2021-09-30	$517,968	22,698	+231.3%	Shares	Sole	2021-11-12
2021-06-30	$142,706	6,851	+158.1%	Shares	Sole	2021-08-10
2021-03-31	$53,451	2,654	-30.7%	Shares	Sole	2021-05-12
2020-12-31	$57,902	3,827	+66.4%	Shares	Sole	2021-02-10
2020-09-30	$24,230	2,300	—	Shares	Sole	2020-11-12
No filing history on record for this holder in this stock.