Alector, Inc. (ALEC) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

102,597,601Shares Outstanding

85,857,880Shares held by institutions

$219,796,173Value of institutional holdings

83.68%Institutional ownership %

33.49%Shares Changed QoQ

125No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Alector, Inc. (NASDAQ:ALEC) is held by 125 institutional investors per 13F filings through December 2025.

Collectively, these holders controlled 83.2% of Alector's outstanding shares in December 2025, up from 73.3% in September 2025.
They increased total shares held in Alector by 34.94% from last quarter, and the number of investors in ALEC decreased 14.38% annually.
Among the 125 funds, 63 bought more Alector shares, 41 sold down, and 21 held their ground.
The aggregate institutional position in Alector amounted to 85.37Mn shares as of December 2025, up by 22.1Mn shares quarter on quarter, and up 10.09Mn shares year over year.
TCG Crossover Management, LLC leads ownership in ALEC with 10.0Mn shares as of December 31, 2025, equal to 9.75% of outstanding shares.
The biggest buyers of Alector for the quarter ending December 2025 included TCG Crossover Management, LLC (10.0Mn), Foresite Capital Management IV, LLC (3.89Mn), BALYASNY ASSET MANAGEMENT L.P. (3.27Mn), 683 Capital Management, LLC (2.35Mn), ADAR1 Capital Management, LLC (2.22Mn).
Top sellers of ALEC stock for the quarter ending December 2025 included FMR LLC (12.95Mn), Barclays Plc (1.52Mn), Royal Bank Of Canada (623.97K), Eversept Partners, LP (482.56K), CITADEL ADVISORS LLC (378.03K).
Per Business Quant data, the top 10 holders of Alector for the quarter ending December 2025 are TCG Crossover Management, LLC (10.0Mn), BlackRock, Inc. (7.15Mn), VANGUARD GROUP INC (6.91Mn), Foresite Capital Management IV, LLC (3.89Mn), Merck & Co., Inc. (3.55Mn), ACADIAN ASSET MANAGEMENT LLC (3.44Mn), 683 Capital Management, LLC (3.35Mn), BALYASNY ASSET MANAGEMENT L.P. (3.27Mn), D. E. Shaw & Co., Inc. (2.37Mn), FMR LLC (2.23Mn).

125 Institutional Holders

85,857,880 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
TCG Crossover Management, LLC	31 Dec, 2025	10,000,000	10,000,000	0.00%	$15,600,000.00
BlackRock, Inc.	31 Dec, 2025	7,147,766	-50,207	-0.70%	$11,150,515.00
VANGUARD GROUP INC	31 Dec, 2025	6,908,054	873,395	14.47%	$10,776,564.00
Foresite Capital Management IV, LLC	31 Dec, 2025	3,887,200	3,887,200	0.00%	$6,064,032.00
Merck & Co., Inc.	31 Dec, 2025	3,545,719	0	0.00%	$5,531,322.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	3,442,449	1,069,464	45.07%	$5,362.00
683 Capital Management, LLC	31 Dec, 2025	3,350,000	2,350,000	235.00%	$5,226,000.00
BALYASNY ASSET MANAGEMENT L.P.	31 Dec, 2025	3,265,575	3,265,575	0.00%	$5,094,297.00
D. E. Shaw & Co., Inc.	31 Dec, 2025	2,365,151	1,386,947	141.79%	$3,689,636.00
FMR LLC	31 Dec, 2025	2,231,171	-12,950,678	-85.30%	$3,480,627.00
ADAR1 Capital Management, LLC	31 Dec, 2025	2,216,000	2,216,000	0.00%	$3,456,960.00
JACOBS LEVY EQUITY MANAGEMENT, INC	31 Dec, 2025	2,173,202	942,228	76.54%	$3,390,195.00
Ikarian Capital, LLC	31 Dec, 2025	2,082,606	1,322,606	174.03%	$3,248,866.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	2,075,220	213,962	11.50%	$3,238,029.00
Kynam Capital Management, LP	31 Dec, 2025	2,000,000	2,000,000	0.00%	$3,120,000.00
State Street Corp	31 Dec, 2025	1,814,298	79,619	4.59%	$2,830,305.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	1,543,650	594,500	62.63%	$2,408,094.00
MEDICI CAPITAL LLC	31 Dec, 2025	1,500,520	1,018,546	211.33%	$2,340,811.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	1,332,914	177,887	15.40%	$2,079,346.00
Euclidean Capital LLC	31 Dec, 2025	1,307,858	0	0.00%	$2,040,258.00

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