Alector, Inc. (ALEC) Institutional Ownership

Institutions by Trading Activity

101,961,765Shares Outstanding

14,102Shares held by institutions

$26,230Value of institutional holdings

0.04%Institutional ownership %

186.84%Shares Changed QoQ

4No. of institutional investors

According to SEC filings for the period ending December 2025, Alector, Inc. (NASDAQ:ALEC) is held by 4 institutional firms.

Alector saw its institutional ownership percentage fell to 0.0% in December 2025 from 73.3% in September 2025.
Institutional share ownership changed by 186.84% QoQ, while the number of institutional owners saw a decrease of 97.26% YoY.
During the quarter, 2 institutions bought more Alector shares, 1 sold shares, and 1 of the 4 total investors held their position steady.
This class of investors increased its holdings in Alector to 42.74K shares for the 13F-cycle ending December 2025, up by 27.84K shares quarter on quarter, and down 73.26Mn shares year over year.
The top institutional stake in Alector as of December 31, 2025 belongs to SG Americas Securities, LLC, which owns 27.00K shares, or 0.03% of the company.
Among the most significant buyers of Alector during December 2025 were SG Americas Securities, LLC (27.00K), GAMMA Investing LLC (1.07K).
Leading sellers of Alector stock in December 2025 included True Wealth Design, LLC (236).
The top 4 institutional holders of Alector for the quarter ending December 2025 included SG Americas Securities, LLC (27.00K), Diversified Trust Co (14.10K), GAMMA Investing LLC (1.07K), True Wealth Design, LLC (563).

14,102 Total Shares Held

Rows:

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
FMR LLC	30 Sep, 2025	15,181,849	182,960	1.22%	$44,938,273.00
BlackRock, Inc.	30 Sep, 2025	7,197,973	-775,607	-9.73%	$21,305,999.00
RTW INVESTMENTS, LP	30 Sep, 2025	6,990,806	6,990,806	0.00%	$20,692,786.00
VANGUARD GROUP INC	30 Sep, 2025	6,034,659	46,955	0.78%	$17,862,591.00
Merck & Co., Inc.	30 Sep, 2025	3,545,719	0	0.00%	$10,495,328.00
ACADIAN ASSET MANAGEMENT LLC	30 Sep, 2025	2,372,985	202,597	9.33%	$7,016.00
PRICE T ROWE ASSOCIATES INC /MD/	30 Sep, 2025	2,185,032	-2,690,232	-55.18%	$6,469.00
GEODE CAPITAL MANAGEMENT, LLC	30 Sep, 2025	1,861,258	-120,810	-6.10%	$5,510,692.00
STATE STREET CORP	30 Sep, 2025	1,734,679	24,777	1.45%	$5,134,650.00
Eversept Partners, LP	30 Sep, 2025	1,488,725	-497,347	-25.04%	$4,406,626.00
Euclidean Capital LLC	30 Sep, 2025	1,307,858	0	0.00%	$3,871,260.00
JACOBS LEVY EQUITY MANAGEMENT, INC	30 Sep, 2025	1,230,974	-91,908	-6.95%	$3,643,683.00
MILLENNIUM MANAGEMENT LLC	30 Sep, 2025	1,155,027	744,224	181.16%	$3,418,880.00
DEUTSCHE BANK AG\	30 Sep, 2025	1,068,215	78,468	7.93%	$3,161,917.00
DEERFIELD MANAGEMENT COMPANY, L.P.	30 Sep, 2025	1,055,192	0	0.00%	$3,123,368.00
683 Capital Management, LLC	30 Sep, 2025	1,000,000	1,000,000	0.00%	$2,960,000.00
5AM Venture Management, LLC	30 Sep, 2025	995,841	0	0.00%	$2,947,689.00
Vestal Point Capital, LP	30 Sep, 2025	980,000	3,008	0.31%	$2,900,800.00
D. E. Shaw & Co., Inc.	30 Sep, 2025	978,204	444,004	83.12%	$2,895,484.00
RENAISSANCE TECHNOLOGIES LLC	30 Sep, 2025	949,150	-305,700	-24.36%	$2,809,484.00

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