David A. Siegel Alector, Inc. Transaction History

Two Sigma Advisers, LP

$47 Billion
Q3 2025

A detailed history of David A. Siegel (Two Sigma Advisers, LP) transactions in Alector, Inc. stock. As of the latest transaction made, Two Sigma Advisers, LP holds 517,400 shares of ALEC stock, worth $641,576. This represents 0.0% of its overall portfolio holdings.

Number of Shares

517,400

Previous 377,000 37.24%

Holding current value

$641,576

Previous $527,000 190.51%

% of portfolio

0.0%

Previous 0.0%

22 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q3 2025 Nov 14, 2025	BUY	$1.42 - $3.18 $199,368 - $446,472	140,400 Added 37.24%	517,400 $1.53 Million
Q2 2025 Aug 14, 2025	SELL	$0.9 - $1.63 $14,310 - $25,917	-15,900 Reduced 4.05%	377,000 $527,000
Q1 2025 May 15, 2025	SELL	$1.23 - $2.06 $45,510 - $76,220	-37,000 Reduced 8.61%	392,900 $483,000
Q4 2024 Feb 14, 2025	BUY	$1.72 - $6.06 $60,200 - $212,100	35,000 Added 8.86%	429,900 $812,000
Q3 2024 Nov 14, 2024	SELL	$4.34 - $6.58 $368,032 - $557,984	-84,800 Reduced 17.68%	394,900 $1.84 Million

Q2 2024 Aug 14, 2024	SELL	$4.19 - $6.23 $250,562 - $372,554	-59,800 Reduced 11.08%	479,700 $2.18 Million
Q1 2024 May 15, 2024	BUY	$5.69 - $8.08 $833,016 - $1.18 Million	146,400 Added 37.24%	539,500 $3.25 Million
Q4 2023 Feb 14, 2024	BUY	$3.77 - $8.39 $15,457 - $34,399	4,100 Added 1.05%	393,100 $3.14 Million
Q3 2023 Nov 14, 2023	SELL	$5.2 - $8.77 $290,680 - $490,243	-55,900 Reduced 12.56%	389,000 $2.52 Million
Q2 2023 Aug 14, 2023	SELL	$5.86 - $7.93 $163,494 - $221,247	-27,900 Reduced 5.9%	444,900 $2.67 Million
Q1 2023 May 15, 2023	BUY	$5.85 - $9.84 $448,695 - $754,728	76,700 Added 19.36%	472,800 $2.93 Million
Q4 2022 Feb 14, 2023	BUY	$6.88 - $9.55 $37,152 - $51,570	5,400 Added 1.38%	396,100 $3.66 Million
Q3 2022 Nov 14, 2022	SELL	$8.19 - $13.2 $168,714 - $271,920	-20,600 Reduced 5.01%	390,700 $3.7 Million
Q2 2022 Aug 15, 2022	BUY	$7.65 - $14.24 $1.08 Million - $2.01 Million	141,000 Added 52.16%	411,300 $4.18 Million
Q1 2022 May 16, 2022	SELL	$13.02 - $20.78 $170,562 - $272,218	-13,100 Reduced 4.62%	270,300 $3.85 Million
Q4 2021 Feb 14, 2022	BUY	$19.35 - $25.54 $2.58 Million - $3.4 Million	133,200 Added 88.68%	283,400 $5.85 Million
Q3 2021 Nov 15, 2021	BUY	$21.65 - $39.49 $794,555 - $1.45 Million	36,700 Added 32.33%	150,200 $3.43 Million
Q2 2021 Aug 16, 2021	SELL	$15.5 - $22.48 $3.21 Million - $4.66 Million	-207,300 Reduced 64.62%	113,500 $2.36 Million
Q1 2021 May 17, 2021	SELL	$14.84 - $22.23 $5.23 Million - $7.83 Million	-352,200 Reduced 52.33%	320,800 $6.46 Million
Q4 2020 Feb 16, 2021	BUY	$9.4 - $16.7 $1.64 Million - $2.91 Million	174,500 Added 35.01%	673,000 $10.2 Million
Q3 2020 Nov 16, 2020	BUY	$10.54 - $24.96 $4.94 Million - $11.7 Million	468,500 Added 1561.67%	498,500 $5.25 Million
Q2 2020 Aug 14, 2020	BUY	$21.87 - $33.11 $656,100 - $993,300	30,000 New	30,000 $733,000

Others Institutions Holding ALEC

# of Institutions

158

Shares Held

58M

Call Options Held

614K

Put Options Held

223K

View Full List

About Alector, Inc.

Ticker ALEC
Exchange NASDAQ
Sector Healthcare
Industry Biotechnology
Shares Outstandng 82,563,904
Market Cap $102M
Description
Alector, Inc., a clinical stage biopharmaceutical company, develops therapies for the treatment of neurodegeneration diseases. Its products include AL001, a humanized recombinant monoclonal antibody, which is in Phase III clinical trial for the treatment of frontotemporal dementia, Alzheimer's, Parkinson's, and amyotrophic lateral sclerosis dise...

More about ALEC

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