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Alector, Inc. (ALEC) institutional ownership

Latest close $1.43 Jul 20, 2026
Market cap$228M 52-week range SectorHealthcare
Funds holding · Q1 2026
124
reported ALEC position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
68 buyers · 56 sellers

Alector, Inc. (ALEC) price and institutional activity

Dates

Q1 2026

$0 bought by 68 investors
Nantahala Capital Management, LLCSpruce Street Capital LP +66 more
$0 sold by 56 investors
Vestal Point Capital, LPTwo Sigma Advisers, LP +54 more
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Bought Sold Totals per quarter; hover a bar for the names.

Alector, Inc. (ALEC) institutional activity · 124

Investor Type Est. change Change Δ Own Date
Nantahala Capital Management, LLC · New
Change +2.8M Date Q1 2026
Nantahala Capital Management, LLC New· Q1 2026 +2.8M Q1 2026
Spruce Street Capital LP · Added
Change +983K Date Q1 2026
Spruce Street Capital LP Added· Q1 2026 +983K Q1 2026
D. E. Shaw & Co., Inc. · Added
Change +968K Δ Own +40.9% Date Q1 2026
D. E. Shaw & Co., Inc. Added· Q1 2026 +968K +40.9% Q1 2026
Vestal Point Capital, LP · Exited
Change −755K Δ Own −100.0% Date Q1 2026
Vestal Point Capital, LP Exited· Q1 2026 −755K −100.0% Q1 2026
Two Sigma Advisers, LP · Exited
Change −652K Δ Own −100.0% Date Q1 2026
Two Sigma Advisers, LP Exited· Q1 2026 −652K −100.0% Q1 2026
Millennium Management LLC · Added
Change +646K Date Q1 2026
Millennium Management LLC Added· Q1 2026 +646K Q1 2026
Acadian Asset Management LLC · Added
Change +596K Date Q1 2026
Acadian Asset Management LLC Added· Q1 2026 +596K Q1 2026
Jane Street Group, LLC · Reduced
Change −594K Date Q1 2026
Jane Street Group, LLC Reduced· Q1 2026 −594K Q1 2026
BlackRock · Added
Change +593K Date Q1 2026
BlackRock Added· Q1 2026 +593K Q1 2026
Marshall Wace, LLP · Reduced
Change −546K Date Q1 2026
Marshall Wace, LLP Reduced· Q1 2026 −546K Q1 2026
Affinity Asset Advisors, LLC · New
Change +500K Date Q1 2026
Affinity Asset Advisors, LLC New· Q1 2026 +500K Q1 2026
FMR LLC · Reduced
Change −435K Δ Own −19.5% Date Q1 2026
FMR LLC Reduced· Q1 2026 −435K −19.5% Q1 2026
Barclays PLC · Reduced
Change −356K Date Q1 2026
Barclays PLC Reduced· Q1 2026 −356K Q1 2026
Eversept Partners, LP · Added
Change +345K Date Q1 2026
Eversept Partners, LP Added· Q1 2026 +345K Q1 2026
Balyasny Asset Management L.P. · Reduced
Change −330K Date Q1 2026
Balyasny Asset Management L.P. Reduced· Q1 2026 −330K Q1 2026
Data through Q1 2026 · filed Jun 2, 2026
15 of 124

Famous investor activity in Alector, Inc. (ALEC)

Alector, Inc. (ALEC) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Wong-Sarad Grace · Officer Grant (A) 20K
Owned 115K ΔOwn +21.0% Trade date Jul 9, 2026 Filed date Jul 9, 2026
Wong-Sarad Grace Officer Grant (A) 20K 115K +21.0% Jul 9, 2026 Jul 9, 2026
Yaffe Kristine · Director 2 operations 38K
Owned 9K Trade date Jun 17, 2026 Filed date Jun 17, 2026
Yaffe Kristine Director 2 operations 38K 9K Jun 17, 2026 Jun 17, 2026
Scheller Richard H. · Director 2 operations 38K
Owned 9K Trade date Jun 17, 2026 Filed date Jun 17, 2026
Scheller Richard H. Director 2 operations 38K 9K Jun 17, 2026 Jun 17, 2026
Hammond Paula · Director 2 operations 38K
Owned 9K Trade date Jun 17, 2026 Filed date Jun 17, 2026
Hammond Paula Director 2 operations 38K 9K Jun 17, 2026 Jun 17, 2026
Garofalo Elizabeth A. · Director 2 operations 38K
Owned 9K Trade date Jun 17, 2026 Filed date Jun 17, 2026
Garofalo Elizabeth A. Director 2 operations 38K 9K Jun 17, 2026 Jun 17, 2026
Altmeyer Mark · Director 2 operations 38K
Owned 9K Trade date Jun 17, 2026 Filed date Jun 17, 2026
Altmeyer Mark Director 2 operations 38K 9K Jun 17, 2026 Jun 17, 2026
Desouza Errol B. · Director 2 operations 38K
Owned 9K Trade date Jun 17, 2026 Filed date Jun 17, 2026
Desouza Errol B. Director 2 operations 38K 9K Jun 17, 2026 Jun 17, 2026
Lavigne Louis J. Jr · Director 2 operations 38K
Owned 9K Trade date Jun 17, 2026 Filed date Jun 17, 2026
Lavigne Louis J. Jr Director 2 operations 38K 9K Jun 17, 2026 Jun 17, 2026
Wong-Sarad Grace · Officer Sell −$7K
Price $1.88 Qty −3K Owned 95K Trade date Jun 3, 2026 Filed date Jun 3, 2026
Wong-Sarad Grace Officer Sell $1.88 −3K −$7K 95K Jun 3, 2026 Jun 3, 2026
Rosenthal Arnon · Director Sell −$172K
Price $1.97 Qty −87K Owned 2.4M Trade date Jun 2, 2026 Filed date Jun 3, 2026
Rosenthal Arnon Director Sell $1.97 −87K −$172K 2.4M Jun 2, 2026 Jun 3, 2026
Wong-Sarad Grace · Officer Sell −$11K
Price $1.97 Qty −6K Owned 99K Trade date Jun 2, 2026 Filed date Jun 3, 2026
Wong-Sarad Grace Officer Sell $1.97 −6K −$11K 99K Jun 2, 2026 Jun 3, 2026
Berkley Neil Lindsay · Officer Sell −$38K
Price $1.97 Qty −19K Owned 380K Trade date Jun 2, 2026 Filed date Jun 3, 2026
Berkley Neil Lindsay Officer Sell $1.97 −19K −$38K 380K Jun 2, 2026 Jun 3, 2026
Scheller Richard H. · Director Grant (A) 11K
Owned 106K Trade date Jun 1, 2026 Filed date Jun 3, 2026
Scheller Richard H. Director Grant (A) 11K 106K Jun 1, 2026 Jun 3, 2026
Wong-Sarad Grace · Officer Sell −$5K
Price $2.65 Qty −2K Owned 105K Trade date Apr 16, 2026 Filed date Apr 17, 2026
Wong-Sarad Grace Officer Sell $2.65 −2K −$5K 105K Apr 16, 2026 Apr 17, 2026
Rosenthal Arnon · Director, Officer Grant (A) 116K
Owned 2.5M Trade date Mar 13, 2026 Filed date Mar 13, 2026
Rosenthal Arnon Director, Officer Grant (A) 116K 2.5M Mar 13, 2026 Mar 13, 2026
15 of 34
15 of 34 Sign in to continue to older insider transactions.

Alector, Inc. (ALEC) activist and large shareholders

What are Schedules 13D and 13G?

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
FMR LLC 12.6M
% of shares outstanding 15.0% Filing date Feb 9, 2024
FMR LLC 12.6M 15.0% Feb 9, 2024
BlackRock Inc. 8.1M
% of shares outstanding 9.6% Filing date Jan 24, 2024
BlackRock Inc. 8.1M 9.6% Jan 24, 2024
Rosenthal Arnon 6.6M
% of shares outstanding 8.0% Filing date Feb 14, 2022
Rosenthal Arnon 6.6M 8.0% Feb 14, 2022
Rosenthal Arnon 8.2M
% of shares outstanding 7.4% Filing date Feb 6, 2026
Rosenthal Arnon 8.2M 7.4% Feb 6, 2026
Vanguard Group Inc 4.4M
% of shares outstanding 5.2% Filing date Feb 13, 2024
Vanguard Group Inc 4.4M 5.2% Feb 13, 2024
Blackrock, Inc. 5.8M
% of shares outstanding 5.2% Filing date Apr 27, 2026
Blackrock, Inc. 5.8M 5.2% Apr 27, 2026
Ecor1 Capital, LLC 4.1M
% of shares outstanding 4.9% Filing date Feb 10, 2023
Ecor1 Capital, LLC 4.1M 4.9% Feb 10, 2023
Tcg Crossover Gp Ii, LLC 5.0M
% of shares outstanding 4.6% Filing date Nov 14, 2025
Tcg Crossover Gp Ii, LLC 5.0M 4.6% Nov 14, 2025
8 of 16

Alector, Inc. (ALEC) ownership FAQ

Who owns ALEC?

124 reporting institutions disclosed ALEC position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.