ALEC Alector, Inc.

NASDAQ
$2.14

Alector, Inc. (ALEC) Institutional Ownership

What the institutions did with ALEC last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared
149
filed both this quarter and last
Managers holding
140
+4 on the quarter
Buyers
72
13 opened new
Sellers
44
9 sold out entirely
Buyer share
62.1%
of managers who traded it
Breadth
+24.1
net buyers, as a share of those trading

Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
TCG Crossover Management, LLC 10.0M 10.4%
Nantahala Capital Management, LLC 8.6M 9.0%
BlackRock, Inc. 7.8M 8.2%
ACADIAN ASSET MANAGEMENT LLC 4.4M 4.6%
VANGUARD CAPITAL MANAGEMENT LLC 4.0M 4.2%
Kynam Capital Management, LP 3.8M 4.0%
Merck & Co., Inc. 3.5M 3.7%
Balyasny Asset Management L.P. 3.2M 3.4%
683 Capital Management, LLC 3.2M 3.3%
D. E. Shaw & Co., Inc. 3.0M 3.1%
ADAR1 Capital Management, LLC 2.9M 3.0%
VANGUARD PORTFOLIO MANAGEMENT LLC 2.8M 2.9%
GEODE CAPITAL MANAGEMENT, LLC 2.5M 2.6%
Spruce Street Capital LP 2.1M 2.2%
MILLENNIUM MANAGEMENT LLC 2.0M 2.1%
Ikarian Capital, LLC 2.0M 2.1%
STATE STREET CORP 1.9M 2.0%
JACOBS LEVY EQUITY MANAGEMENT, INC 1.8M 1.8%
MEDICI CAPITAL LLC 1.7M 1.7%
Affinity Asset Advisors, LLC 1.5M 1.6%
Eversept Partners, LP 1.4M 1.5%
FMR LLC 1.4M 1.5%
AQR CAPITAL MANAGEMENT LLC 1.3M 1.4%
Euclidean Capital LLC 1.3M 1.4%
MACKENZIE FINANCIAL CORP 1.1M 1.2%

Largest changes

Manager Action Previous Current Change
Nantahala Capital Management, LLC Increased 2.8M 8.6M +5.8M
Foresite Capital Management IV, LLC Sold Out 3.9M 0 -3.9M
ADAR1 Capital Management, LLC Increased 1.1M 2.9M +1.8M
Kynam Capital Management, LP Increased 2.0M 3.8M +1.8M
Affinity Asset Advisors, LLC Increased 500.0K 1.5M +1.0M
AQR CAPITAL MANAGEMENT LLC Increased 711.3K 1.3M +598.2K
CANTOR FITZGERALD, L. P. New 0 591.0K +591.0K
FMR LLC Reduced 1.8M 1.4M -399.7K
JANE STREET GROUP, LLC Sold Out 399.5K 0 -399.5K
JACOBS LEVY EQUITY MANAGEMENT, INC Reduced 2.2M 1.8M -388.4K
ACADIAN ASSET MANAGEMENT LLC Increased 4.0M 4.4M +375.6K
D. E. Shaw & Co., Inc. Reduced 3.3M 3.0M -372.9K
RENAISSANCE TECHNOLOGIES LLC Reduced 1.3M 935.2K -352.5K
VANGUARD CAPITAL MANAGEMENT LLC Increased 3.7M 4.0M +330.6K
CITADEL ADVISORS LLC Increased 77.5K 391.2K +313.7K
Balyasny Asset Management L.P. Increased 2.9M 3.2M +312.2K
PANAGORA ASSET MANAGEMENT INC Increased 590.4K 846.0K +255.6K
MACKENZIE FINANCIAL CORP Increased 857.4K 1.1M +252.4K
DIMENSIONAL FUND ADVISORS LP Reduced 283.8K 33.7K -250.1K
MORGAN STANLEY Reduced 364.6K 120.5K -244.1K
BANK OF AMERICA CORP /DE/ Reduced 380.9K 142.7K -238.2K
VANGUARD PORTFOLIO MANAGEMENT LLC Increased 2.6M 2.8M +237.0K
TWO SIGMA INVESTMENTS, LP Reduced 1.3M 1.0M -233.9K
LMR Partners LLP New 0 200.0K +200.0K
GOLDMAN SACHS GROUP INC Reduced 604.6K 433.9K -170.7K
GEODE CAPITAL MANAGEMENT, LLC Increased 2.3M 2.5M +168.1K
XTX Topco Ltd Reduced 559.9K 399.7K -160.2K
UBS Group AG Increased 145.3K 273.8K +128.4K
BlackRock, Inc. Increased 7.7M 7.8M +106.6K
Ikarian Capital, LLC Reduced 2.1M 2.0M -100.0K
Odyssean, LLC Sold Out 89.8K 0 -89.8K
VANGUARD FIDUCIARY TRUST CO Increased 577.9K 663.6K +85.7K
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced 107.6K 24.1K -83.5K
NORTHERN TRUST CORP Increased 692.3K 773.5K +81.2K
GSA CAPITAL PARTNERS LLP Sold Out 78.2K 0 -78.2K
Eversept Partners, LP Increased 1.4M 1.4M +72.8K
WELLS FARGO & COMPANY/MN Increased 34.5K 89.2K +54.6K
Point72 Asset Management, L.P. Reduced 80.1K 26.7K -53.4K
CANADA PENSION PLAN INVESTMENT BOARD Reduced 183.2K 131.3K -51.9K
AMERIPRISE FINANCIAL INC Reduced 271.3K 224.5K -46.7K
Graham Capital Management, L.P. New 0 46.5K +46.5K
CITIGROUP INC Increased 4.6K 46.3K +41.6K
Verdad Advisers, LP Increased 23.6K 60.5K +37.0K
Mariner, LLC Increased 18.8K 52.7K +33.9K
Russell Investments Group, Ltd. Increased 66.1K 98.5K +32.4K
CHARLES SCHWAB INVESTMENT MANAGEMENT INC Increased 787.4K 818.8K +31.4K
BOOTHBAY FUND MANAGEMENT, LLC Reduced 559.7K 532.9K -26.9K
PRICE T ROWE ASSOCIATES INC /MD/ Increased 56.1K 81.7K +25.6K
MERCER GLOBAL ADVISORS INC /ADV New 0 25.5K +25.5K
GROUP ONE TRADING LLC New 0 25.2K +25.2K
Cannell & Spears LLC Reduced 54.6K 30.3K -24.3K
MetLife Investment Management, LLC Increased 36.2K 58.7K +22.5K
MARSHALL WACE, LLP Reduced 620.4K 598.6K -21.9K
Nuveen, LLC Increased 154.9K 176.2K +21.3K
ROYAL BANK OF CANADA Increased 7.0K 26.1K +19.1K
SEI INVESTMENTS CO Increased 53.8K 71.2K +17.3K
SIMPLEX TRADING, LLC Increased 68.5K 85.5K +17.0K
Qube Research & Technologies Ltd New 0 16.6K +16.6K
Diversified Trust Co Increased 25.9K 42.4K +16.5K
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Reduced 136.0K 119.8K -16.2K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.