Alector, Inc. - Common Stock (ALEC) Institutional Ownership

13F Institutional Holders and Ownership History from Q1 2019 to Q4 2025

Type / Class
Equity / Common Stock
Symbol
ALEC on Nasdaq
Shares outstanding
110,208,617
Price per share
$1.56
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
74,753,323
Total reported value
$221,270,506
% of total 13F portfolios
0%
Share change
+4,243,032
Value change
+$17,828,715
Number of holders
146
Price from insider filings
$1.56
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Alector, Inc. - Common Stock (ALEC) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
TCG Crossover GP II, LLC 9.2% $29,600,000 10,000,000 Chen Yu 22 Oct 2025
Polaris Venture Partners VI, L.P. 6.5% $21,001,943 7,095,251 Terrance G. McGuire 30 Sep 2025
RTW INVESTMENTS, LP 6.9% $20,692,786 6,990,806 RTW Investments, LP 30 Sep 2025
BlackRock, Inc. 4.7% -8% $8,080,496 -$33,208 5,179,805 -0.41% BlackRock, Inc. 31 Dec 2025
FMR LLC 3.6% $10,655,467 3,599,820 FMR LLC 31 Oct 2025

As of 30 Sep 2025, 146 institutional investors reported holding 74,753,323 shares of Alector, Inc. - Common Stock (ALEC). This represents 68% of the company’s total 110,208,617 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Alector, Inc. - Common Stock (ALEC) together control 57% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
FMR LLC 14% 15,181,849 +1.2% 0% $44,938,273
BlackRock, Inc. 6.5% 7,197,973 -9.7% 0% $21,305,999
RTW INVESTMENTS, LP 6.3% 6,990,806 0.25% $20,692,786
VANGUARD GROUP INC 5.5% 6,034,659 +0.78% 0% $17,862,591
Merck & Co., Inc. 3.2% 3,545,719 0% 4.6% $10,495,328
ACADIAN ASSET MANAGEMENT LLC 2.2% 2,372,985 +9.3% 0.01% $7,016,000
PRICE T ROWE ASSOCIATES INC /MD/ 2% 2,185,032 -55% 0% $6,469,000
GEODE CAPITAL MANAGEMENT, LLC 1.7% 1,861,258 -6.1% 0% $5,510,692
STATE STREET CORP 1.6% 1,734,679 +1.4% 0% $5,134,650
Eversept Partners, LP 1.4% 1,488,725 -25% 0.34% $4,406,626
Euclidean Capital LLC 1.2% 1,307,858 0% 1.6% $3,871,260
JACOBS LEVY EQUITY MANAGEMENT, INC 1.1% 1,230,974 -6.9% 0.01% $3,643,683
MILLENNIUM MANAGEMENT LLC 1% 1,155,027 +181% 0% $3,418,880
DEUTSCHE BANK AG\ 0.97% 1,068,215 +7.9% 0% $3,161,917
DEERFIELD MANAGEMENT COMPANY, L.P. 0.96% 1,055,192 0% 0.05% $3,123,368
683 Capital Management, LLC 0.91% 1,000,000 0.27% $2,960,000
5AM Venture Management, LLC 0.9% 995,841 0% 1.1% $2,947,689
Vestal Point Capital, LP 0.89% 980,000 +0.31% 0.13% $2,900,800
D. E. Shaw & Co., Inc. 0.89% 978,204 +83% 0% $2,895,484
RENAISSANCE TECHNOLOGIES LLC 0.86% 949,150 -24% 0% $2,809,484
BARCLAYS PLC 0.79% 873,375 +414% 0% $2,585,189
DAFNA Capital Management LLC 0.72% 798,351 -13% 0.58% $2,363,119
Ikarian Capital, LLC 0.69% 760,000 -16% 0.51% $2,249,601
PANAGORA ASSET MANAGEMENT INC 0.67% 741,293 +43% 0.01% $2,194,227
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.63% 689,524 +6.5% 0% $2,040,991

Institutional Holders of Alector, Inc. - Common Stock (ALEC) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 43,758 $68,140 -$206,077 $1.56 5
2025 Q3 74,753,323 $221,270,506 +$17,828,715 $2.96 146
2025 Q2 70,504,594 $98,716,242 -$652,478 $1.40 134
2025 Q1 72,505,139 $89,184,395 -$1,704,057 $1.23 139
2024 Q4 73,449,099 $138,781,190 -$36,884,482 $1.89 147
2024 Q3 72,547,576 $338,388,962 -$1,018,637 $4.66 158
2024 Q2 72,687,195 $329,955,349 -$13,884,915 $4.54 157
2024 Q1 74,200,085 $446,678,675 +$61,253,193 $6.02 156
2023 Q4 63,928,176 $510,115,302 +$16,550,304 $7.98 144
2023 Q3 62,119,605 $402,563,158 +$20,670,443 $6.48 145
2023 Q2 58,985,239 $354,496,843 +$4,367,360 $6.01 142
2023 Q1 58,273,875 $360,651,817 +$17,929,999 $6.19 144
2022 Q4 54,844,285 $506,217,126 -$5,426,867 $9.23 154
2022 Q3 54,578,353 $516,264,248 +$5,671,869 $9.46 162
2022 Q2 53,817,727 $546,756,104 -$17,438,158 $10.16 148
2022 Q1 55,399,462 $789,780,092 -$5,073,123 $14.25 159
2021 Q4 54,728,224 $1,130,142,954 +$66,134,357 $20.65 160
2021 Q3 52,231,382 $1,191,926,737 +$72,825,941 $22.82 144
2021 Q2 49,168,688 $1,024,647,606 +$63,360,607 $20.83 133
2021 Q1 46,154,577 $929,480,793 +$13,141,895 $20.14 123
2020 Q4 46,284,829 $700,229,278 -$61,389,553 $15.13 130
2020 Q3 49,519,452 $522,137,542 -$50,083,788 $10.54 136
2020 Q2 50,099,049 $1,223,842,967 +$53,677,644 $24.44 133
2020 Q1 47,897,578 $1,155,708,612 +$264,293,053 $24.13 102
2019 Q4 37,073,169 $638,772,713 +$44,393,449 $17.23 81
2019 Q3 34,671,437 $499,972,276 +$80,611,697 $14.42 74
2019 Q2 29,064,816 $551,259,295 +$7,378,322 $19.00 63
2019 Q1 27,527,687 $515,314,000 +$515,304,000 $18.72 53