Alector, Inc. - ALEC

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q1 2026 · Compare: Q4 2025
13D/13G major owners: Ownership tab.
Methodology: Market value and % of portfolio use SEC reported VALUE ($000). For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received. Details.
Rows: 0
Investor History Status Shares held Market value ($000) % of portfolio Previous % Rank Change in shares % change in shares Source Date reported
TCG Crossover Management, LLC History No change 10,000,000 21,500 0.62% 0.52% 1 0 0.0% Q1 2026 May 15, 2026
BlackRock, Inc. History Added to 7,741,245 16,643 0.0% 0.0% 2 +593,479 8.3% Q1 2026 May 13, 2026
VANGUARD GROUP INC History No change 6,908,054 10,776 0.0% 0.0% 3 0 0.0% Q4 2025 Jan 29, 2026
ACADIAN ASSET MANAGEMENT LLC History Added to 4,038,785 8,675 0.01% 0.01% 4 +596,336 17.32% Q1 2026 May 13, 2026
Foresite Capital Management IV, LLC History No change 3,887,200 8,357 3.52% 2.64% 5 0 0.0% Q1 2026 May 15, 2026
VANGUARD CAPITAL MANAGEMENT LLC History New 3,678,722 7,909 0.0% 6 +3,678,722 New Q1 2026 May 15, 2026
Merck & Co., Inc. History No change 3,545,719 7,623 2.18% 2.0% 7 0 0.0% Q1 2026 May 13, 2026
D. E. Shaw & Co., Inc. History Added to 3,332,835 7,165 0.0% 0.0% 8 +967,684 40.91% Q1 2026 May 15, 2026
683 Capital Management, LLC History Reduced 3,200,000 6,880 0.36% 0.23% 9 -150,000 -4.48% Q1 2026 May 15, 2026
BALYASNY ASSET MANAGEMENT L.P. History Reduced 2,935,253 6,310 0.01% 0.01% 10 -330,322 -10.12% Q1 2026 May 15, 2026
Nantahala Capital Management, LLC History New 2,815,983 6,054 0.22% 11 +2,815,983 New Q1 2026 May 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC History New 2,583,542 5,554 0.0% 12 +2,583,542 New Q1 2026 May 08, 2026
GEODE CAPITAL MANAGEMENT, LLC History Added to 2,286,218 4,916 0.0% 0.0% 13 +210,998 10.17% Q1 2026 May 15, 2026
JACOBS LEVY EQUITY MANAGEMENT, INC History Reduced 2,154,361 4,631 0.02% 0.01% 14 -18,841 -0.87% Q1 2026 May 15, 2026
Spruce Street Capital LP History Added to 2,101,068 4,517 1.09% 0.58% 15 +983,082 87.93% Q1 2026 May 14, 2026
Ikarian Capital, LLC History No change 2,082,606 4,477 0.36% 0.25% 16 0 0.0% Q1 2026 May 15, 2026
Kynam Capital Management, LP History No change 2,000,000 4,300 0.27% 0.2% 17 0 0.0% Q1 2026 May 15, 2026
MILLENNIUM MANAGEMENT LLC History Added to 1,979,226 4,255 0.0% 0.0% 18 +646,312 48.49% Q1 2026 May 15, 2026
STATE STREET CORP History Added to 1,865,526 4,010 0.0% 0.0% 19 +51,228 2.82% Q1 2026 May 15, 2026
FMR LLC History Reduced 1,796,104 3,861 0.0% 0.0% 20 -435,067 -19.5% Q1 2026 May 15, 2026
MEDICI CAPITAL LLC History Added to 1,652,520 3,552 4.37% 1.88% 21 +152,000 10.13% Q1 2026 May 13, 2026
Eversept Partners, LP History Added to 1,351,106 2,904 0.15% 0.08% 22 +344,943 34.28% Q1 2026 May 15, 2026
Euclidean Capital LLC History No change 1,307,858 2,811 0.72% 0.55% 23 0 0.0% Q1 2026 May 15, 2026
RENAISSANCE TECHNOLOGIES LLC History Reduced 1,287,691 2,768 0.0% 0.0% 24 -255,959 -16.58% Q1 2026 May 14, 2026
TWO SIGMA INVESTMENTS, LP History Added to 1,279,306 2,750 0.0% 0.0% 25 +239,650 23.05% Q1 2026 May 15, 2026
DEUTSCHE BANK AG\ History Added to 1,092,903 2,349 0.0% 0.0% 26 +57,749 5.58% Q1 2026 May 06, 2026
DEERFIELD MANAGEMENT COMPANY, L.P. History No change 1,055,192 2,268 0.03% 0.02% 27 0 0.0% Q1 2026 May 15, 2026
ADAR1 Capital Management, LLC History Reduced 1,050,000 2,257 0.13% 0.13% 28 -58,000 -5.23% Q1 2026 May 15, 2026
DAFNA Capital Management LLC History No change 908,351 1,952 0.44% 0.33% 29 0 0.0% Q1 2026 May 15, 2026
Elmind Capital, LP History No change 900,000 1,935 0.55% 0.41% 30 0 0.0% Q1 2026 May 15, 2026
MACKENZIE FINANCIAL CORP History Added to 857,354 1,843 0.0% 0.0% 31 +197,186 29.87% Q1 2026 May 13, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INC History Added to 787,408 1,692 0.0% 0.0% 32 +121,917 18.32% Q1 2026 May 15, 2026
AQR CAPITAL MANAGEMENT LLC History Added to 711,334 1,529 0.0% 0.0% 33 +111,765 18.64% Q1 2026 May 15, 2026
NORTHERN TRUST CORP History Added to 692,256 1,488 0.0% 0.0% 34 +104,603 17.8% Q1 2026 May 14, 2026
MARSHALL WACE, LLP History Reduced 620,424 1,333 0.0% 0.0% 35 -546,393 -46.83% Q1 2026 May 14, 2026
GOLDMAN SACHS GROUP INC History Added to 604,562 1,299 0.0% 0.0% 36 +166,603 38.04% Q1 2026 May 15, 2026
PANAGORA ASSET MANAGEMENT INC History Reduced 590,388 1,269 0.0% 0.0% 37 -259,910 -30.57% Q1 2026 May 14, 2026
VANGUARD FIDUCIARY TRUST CO History New 577,939 1,242 0.0% 38 +577,939 New Q1 2026 May 08, 2026
XTX Topco Ltd History Reduced 559,896 1,203 0.02% 0.02% 40 -32,943 -5.56% Q1 2026 May 15, 2026
BOOTHBAY FUND MANAGEMENT, LLC History No change 559,726 1,203 0.02% 0.01% 39 0 0.0% Q1 2026 May 15, 2026
Affinity Asset Advisors, LLC History New 500,000 1,075 0.06% 41 +500,000 New Q1 2026 May 14, 2026
TWO SIGMA ADVISERS, LP History No change 651,800 1,016 0.0% 0.0% 42 0 0.0% Q4 2025 Feb 17, 2026
JANE STREET GROUP, LLC History Reduced 431,264 927 0.0% 0.0% 43 -575,249 -57.15% Q1 2026 May 12, 2026
BANK OF AMERICA CORP /DE/ History Added to 380,908 818 0.0% 0.0% 44 +246,402 183.19% Q1 2026 May 15, 2026
MORGAN STANLEY History Added to 364,567 783 0.0% 0.0% 45 +45,495 14.26% Q1 2026 May 15, 2026
DIMENSIONAL FUND ADVISORS LP History Added to 283,817 609 0.0% 0.0% 46 +84,691 42.53% Q1 2026 May 07, 2026
AMERIPRISE FINANCIAL INC History Reduced 271,272 583 0.0% 0.0% 47 -83,027 -23.43% Q1 2026 May 15, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP History Reduced 269,297 578 0.0% 0.0% 48 -300,983 -52.78% Q1 2026 May 15, 2026
Invesco Ltd. History Reduced 265,067 569 0.0% 0.0% 49 -14,401 -5.15% Q1 2026 May 12, 2026
Bank of New York Mellon Corp History Added to 252,297 542 0.0% 0.0% 50 +34,435 15.81% Q1 2026 May 05, 2026
NANO CAP NEW MILLENNIUM GROWTH FUND L P History No change 200,000 430 0.4% 0.27% 51 0 0.0% Q1 2026 May 15, 2026
CANADA PENSION PLAN INVESTMENT BOARD History Added to 183,200 393 0.0% 0.0% 52 +10,900 6.33% Q1 2026 May 15, 2026
Nuveen, LLC History Added to 154,930 333 0.0% 0.0% 53 +21,682 16.27% Q1 2026 Apr 30, 2026
Utah Retirement Systems History Added to 154,290 331 0.0% 0.0% 54 +20,572 15.38% Q1 2026 May 15, 2026
UBS Group AG History Added to 145,344 312 0.0% 0.0% 55 +25,933 21.72% Q1 2026 May 05, 2026
BRIDGEWAY CAPITAL MANAGEMENT, LLC History Added to 142,500 306 0.01% 0.0% 56 +27,500 23.91% Q1 2026 May 15, 2026
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO History No change 136,000 292 0.0% 0.0% 57 0 0.0% Q1 2026 May 14, 2026
CITADEL ADVISORS LLC History Reduced 109,245 234 0.0% 0.0% 58 -70,702 -39.29% Q1 2026 May 15, 2026
RHUMBLINE ADVISERS History Reduced 101,327 217 0.0% 0.0% 59 -599 -0.59% Q1 2026 May 12, 2026
Odyssean, LLC History New 89,783 193 0.07% 60 +89,783 New Q1 2026 May 15, 2026
STRS OHIO History Reduced 86,500 185 0.0% 0.0% 61 -23,900 -21.65% Q1 2026 Apr 24, 2026
Point72 Asset Management, L.P. History Added to 80,091 172 0.0% 0.0% 62 +56,989 246.68% Q1 2026 May 15, 2026
GSA CAPITAL PARTNERS LLP History Reduced 78,207 168 0.01% 0.03% 63 -147,359 -65.33% Q1 2026 May 08, 2026
Blackstone Inc. History Added to 77,145 165 0.0% 0.0% 64 +10,286 15.38% Q1 2026 May 15, 2026
Jasper Ridge Partners, L.P. History Reduced 73,531 158 0.0% 0.0% 65 -21,537 -22.65% Q1 2026 May 11, 2026
DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main History New 69,666 149 0.0% 66 +69,666 New Q1 2026 May 15, 2026
SIMPLEX TRADING, LLC History Reduced 68,477 147 0.0% 0.0% 67 -13,540 -16.51% Q1 2026 May 14, 2026
ALLIANCEBERNSTEIN L.P. History No change 92,940 144 0.0% 0.0% 68 0 0.0% Q1 2026 May 15, 2026
Russell Investments Group, Ltd. History Reduced 66,131 142 0.0% 0.0% 69 -5,756 -8.01% Q1 2026 May 08, 2026
PRICE T ROWE ASSOCIATES INC /MD/ History Reduced 56,100 121 0.0% 0.0% 70 -103 -0.18% Q1 2026 May 15, 2026
Cannell & Spears LLC History No change 54,642 117 0.0% 0.0% 71 0 0.0% Q1 2026 May 15, 2026
SEI INVESTMENTS CO History Added to 53,846 115 0.0% 0.0% 72 +36,962 218.92% Q1 2026 May 13, 2026
Vanguard Personalized Indexing Management, LLC History Reduced 50,629 108 0.0% 0.0% 73 -2,427 -4.57% Q1 2026 May 14, 2026
HSBC HOLDINGS PLC History Added to 48,523 104 0.0% 0.0% 74 +2 0.0% Q1 2026 Apr 30, 2026
IEQ CAPITAL, LLC History New 47,080 101 0.0% 75 +47,080 New Q1 2026 May 14, 2026
BARCLAYS PLC History Reduced 42,591 91 0.0% 0.0% 76 -356,096 -89.32% Q1 2026 May 14, 2026
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. History Added to 42,661 91 0.0% 0.0% 77 +5,390 14.46% Q1 2026 May 15, 2026
MetLife Investment Management, LLC History New 36,208 77 0.0% 78 +36,208 New Q1 2026 May 14, 2026
JPMORGAN CHASE & CO History Added to 37,379 75 0.0% 0.0% 79 +4,756 14.58% Q1 2026 May 13, 2026
WELLS FARGO & COMPANY/MN History Reduced 34,526 74 0.0% 0.0% 80 -55,582 -61.68% Q1 2026 May 11, 2026
Vanguard Global Advisers, LLC History New 31,302 67 0.0% 81 +31,302 New Q1 2026 May 08, 2026
Vontobel Holding Ltd. History No change 30,000 64 0.0% 0.0% 82 0 0.0% Q1 2026 May 08, 2026
CWM, LLC History Added to 28,985 62 0.0% 0.0% 83 +16,821 138.29% Q1 2026 May 14, 2026
Cerity Partners LLC History Added to 26,976 57 0.0% 0.0% 84 +13,294 97.16% Q1 2026 May 15, 2026
MANUFACTURERS LIFE INSURANCE COMPANY, THE History Reduced 26,148 56 0.0% 0.0% 85 -2,681 -9.3% Q1 2026 May 15, 2026
Diversified Trust Co History Added to 25,895 55 0.0% 0.0% 86 +11,793 83.63% Q1 2026 Apr 16, 2026
INTECH INVESTMENT MANAGEMENT LLC History Reduced 23,954 51 0.0% 0.0% 87 -10,556 -30.59% Q1 2026 May 08, 2026
PRUDENTIAL FINANCIAL INC History Reduced 23,795 51 0.0% 0.0% 88 -8,430 -26.16% Q1 2026 May 13, 2026
Verdad Advisers, LP History New 23,554 50 0.06% 90 +23,554 New Q1 2026 May 15, 2026
Police & Firemen's Retirement System of New Jersey History No change 23,426 50 0.0% 0.0% 89 0 0.0% Q1 2026 Apr 29, 2026
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC History New 18,197 43 0.0% 92 +18,197 New Q1 2026 Apr 08, 2026
BNP PARIBAS FINANCIAL MARKETS History Reduced 20,027 43 0.0% 0.0% 91 -2,358 -10.53% Q1 2026 May 12, 2026
Quadrature Capital Ltd History Reduced 19,486 41 0.0% 0.0% 94 -42,787 -68.71% Q1 2026 May 15, 2026
Bronte Capital Management Pty Ltd. History No change 19,282 41 0.0% 0.0% 93 0 0.0% Q1 2026 Apr 27, 2026
Mariner, LLC History New 18,799 40 0.0% 95 +18,799 New Q1 2026 May 13, 2026
VOYA INVESTMENT MANAGEMENT LLC History Added to 15,478 33 0.0% 0.0% 96 +1,549 11.12% Q1 2026 May 12, 2026
Neuberger Berman Group LLC History Added to 14,528 31 0.0% 0.0% 97 +355 2.5% Q1 2026 May 14, 2026
HAMILTON LANE ADVISORS LLC History New 14,400 30 0.02% 98 +14,400 New Q1 2026 Apr 08, 2026
ProShare Advisors LLC History Reduced 13,188 28 0.0% 0.0% 99 -1,484 -10.11% Q1 2026 Apr 24, 2026
Merit Financial Group, LLC History New 10,928 23 0.0% 101 +10,928 New Q1 2026 Apr 15, 2026
HighTower Advisors, LLC History Added to 10,760 23 0.0% 0.0% 100 +749 7.48% Q1 2026 May 05, 2026
CAPTRUST FINANCIAL ADVISORS History New 10,648 22 0.0% 103 +10,648 New Q1 2026 May 14, 2026
NEW YORK STATE COMMON RETIREMENT FUND History No change 10,310 22 0.0% 0.0% 102 0 0.0% Q1 2026 May 06, 2026
Legal & General Group Plc History Added to 8,346 17 0.0% 0.0% 104 +2,307 38.2% Q1 2026 May 08, 2026
Ameritas Investment Partners, Inc. History No change 8,175 17 0.0% 0.0% 105 0 0.0% Q1 2026 May 13, 2026
ROYAL BANK OF CANADA History Added to 7,047 15 0.0% 0.0% 106 +2,369 50.64% Q1 2026 May 15, 2026
Tower Research Capital LLC (TRC) History Reduced 5,943 12 0.0% 0.0% 107 -33,577 -84.96% Q1 2026 May 15, 2026
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM History Reduced 4,894 10 0.0% 0.0% 108 -46 -0.93% Q1 2026 May 15, 2026
CITIGROUP INC History Reduced 4,639 9 0.0% 0.0% 109 -1,516 -24.63% Q1 2026 May 11, 2026
Essential Partners LLC History Added to 3,857 8 0.0% 110 +3,426 794.9% Q1 2026 May 21, 2026
Sterling Capital Management LLC History Reduced 2,806 6 0.0% 0.0% 111 -1,615 -36.53% Q1 2026 Apr 22, 2026
Optiver Holding B.V. History New 1,701 3 0.0% 114 +1,701 New Q1 2026 Jun 02, 2026
State of Wyoming History New 1,645 3 0.0% 113 +1,645 New Q1 2026 May 13, 2026
GAMMA Investing LLC History Added to 1,523 3 0.0% 0.0% 112 +448 41.67% Q1 2026 Apr 06, 2026
NISA INVESTMENT ADVISORS, LLC History No change 1,016 2 0.0% 0.0% 115 0 0.0% Q1 2026 Apr 30, 2026
Allworth Financial LP History New 627 1 0.0% 119 +627 New Q1 2026 May 14, 2026
EverSource Wealth Advisors, LLC History Added to 887 1 0.0% 116 +383 75.99% Q1 2026 May 15, 2026
True Wealth Design, LLC History Added to 593 1 0.0% 118 +30 5.33% Q1 2026 Apr 13, 2026
Physician Wealth Advisors, Inc. History No change 752 1 0.0% 0.0% 117 0 0.0% Q1 2026 Apr 24, 2026
Vestal Point Capital, LP History Closed out 0 0 0.04% -755,000 -100.0% Q1 2026 May 15, 2026
Graham Capital Management, L.P. History Closed out 0 0 0.0% -104,851 -100.0% Q1 2026 May 15, 2026
DekaBank Deutsche Girozentrale History Closed out 0 0 0.0% -100,000 -100.0% Q1 2026 May 07, 2026
LOS ANGELES CAPITAL MANAGEMENT LLC History Closed out 0 0 0.0% -93,052 -100.0% Q1 2026 May 08, 2026
Man Group plc History Closed out 0 0 0.0% -86,162 -100.0% Q1 2026 May 15, 2026
Squarepoint Ops LLC History Closed out 0 0 0.0% -77,618 -100.0% Q1 2026 May 15, 2026
HRT FINANCIAL LP History Closed out 0 0 0.0% -57,341 -100.0% Q1 2026 May 14, 2026
Lexington Partners L.P. History Closed out 0 0 0.02% -53,488 -100.0% Q1 2026 May 06, 2026
OXFORD ASSET MANAGEMENT LLP History Closed out 0 0 0.03% -42,905 -100.0% Q1 2026 May 15, 2026
TUDOR INVESTMENT CORP ET AL History Closed out 0 0 0.0% -41,282 -100.0% Q1 2026 May 15, 2026
SG Americas Securities, LLC History Closed out 0 0 0.0% -27,002 -100.0% Q1 2026 Apr 16, 2026
Dynamic Technology Lab Private Ltd History Closed out 0 0 0.01% -25,881 -100.0% Q1 2026 May 15, 2026
Virtu Financial LLC History Closed out 0 0 0.0% -21,886 -100.0% Q1 2026 May 14, 2026
HERSHEY TRUST CO History Closed out 0 0 0.0% -20,572 -100.0% Q1 2026 May 15, 2026
R Squared Ltd History Closed out 0 0 0.01% -12,474 -100.0% Q1 2026 Apr 29, 2026
Corient Private Wealth LLC History Closed out 0 0 0.0% -10,288 -100.0% Q1 2026 May 15, 2026
Texas Yale Capital Corp. History Closed out 0 0 0.0% -10,000 -100.0% Q1 2026 May 04, 2026
AMALGAMATED BANK History Closed out 0 0 0.0% -2,523 -100.0% Q1 2026 May 08, 2026
OSAIC HOLDINGS, INC. History Closed out 0 0 -620 -100.0% Q1 2026 May 15, 2026
Root Financial Partners, LLC History New 305 0 +305 New Q1 2026 Apr 24, 2026
Advisory Services Network, LLC History New 271 0 +271 New Q1 2026 May 15, 2026
Fortitude Family Office, LLC History New 255 0 +255 New Q1 2026 Apr 15, 2026
Arax Advisory Partners History New 179 0 +179 New Q1 2026 May 13, 2026
Farther Finance Advisors, LLC History New 156 0 +156 New Q1 2026 Apr 07, 2026
Hughes Financial Services, LLC History Reduced 412 0 -141 -25.5% Q1 2026 Apr 29, 2026
MAI Capital Management History New 67 0 +67 New Q1 2026 May 15, 2026
Lloyd Advisory Services, LLC. History New 48 0 +48 New Q1 2026 May 13, 2026
IFP Advisors, Inc History Reduced 6 0 -41 -87.23% Q1 2026 Apr 13, 2026
ROTHSCHILD INVESTMENT LLC History Added to 240 0 +31 14.83% Q1 2026 May 07, 2026
Sunbelt Securities, Inc. History New 17 0 +17 New Q1 2026 May 15, 2026
FIFTH THIRD BANCORP History New 6 0 +6 New Q1 2026 May 01, 2026
Caitong International Asset Management Co., Ltd History New 2 0 +2 New Q1 2026 May 11, 2026
Wilmington Savings Fund Society, FSB History No change 400 0 0 0.0% Q1 2026 Apr 30, 2026
COMERICA BANK History No change 9 0 0 0.0% Q4 2025 Jan 29, 2026
NATIONAL BANK OF CANADA /FI/ History No change 200 0 0 0.0% Q1 2026 May 14, 2026
MARK SHEPTOFF FINANCIAL PLANNING, LLC History No change 300 0 0 0.0% Q1 2026 May 11, 2026
Rockefeller Capital Management L.P. History No change 367 0 0 0.0% Q1 2026 May 14, 2026
SBI Securities Co., Ltd. History No change 20 0 0 0.0% Q1 2026 Apr 27, 2026
Kingdom Financial Group LLC. History No change 48 0 0 0.0% Q1 2026 May 13, 2026
Federation des caisses Desjardins du Quebec History No change 415 0 0 0.0% Q1 2026 May 13, 2026