Latest Period
Q4 2025
Security Snapshot
Alector, Inc. - Common Stock (ALEC) Institutional Ownership
CUSIP: 014442107
13F Institutional Holders and Ownership History from Q1 2019 to Q1 2026
Institutions Reporting
128
Shares (Excl. Options)
84,345,909
Price
$1.56
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- Type / Class
- Equity / Common Stock
- Symbol
- ALEC on Nasdaq
- Shares outstanding
- 111,234,885
- Price per share
- $2.35
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 84,345,909
- Total reported value
- $131,539,973
- % of total 13F portfolios
- 0%
- Share change
- +7,938,661
- Value change
- -$373,040
- Number of holders
- 128
- Price from insider filings
- $2.35
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- ALEC - Alector, Inc. - Common Stock is tracked under CUSIP 014442107.
- 128 institutions reported positions in Q4 2025.
- 5 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 128 to 64 between Q4 2025 and Q1 2026.
- Reported value moved from $131,539,973 to $60,603,538.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 128 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 014442107?
CUSIP 014442107 identifies ALEC - Alector, Inc. - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 014442107:
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 | |||
| Rosenthal Arnon | 7.4% | $12,813,723 | 8,213,925 | Arnon Rosenthal | 31 Dec 2025 | |||
| Polaris Venture Partners VI, L.P. | 6.5% | $21,001,943 | 7,095,251 | Terrance G. McGuire | 30 Sep 2025 | |||
| BlackRock, Inc. | 5.2% | +10% | $12,436,060 | +$1,299,479 | 5,784,214 | +12% | BlackRock, Inc. | 31 Mar 2026 |
| FMR LLC | 3.6% | $10,655,467 | 3,599,820 | FMR LLC | 31 Oct 2025 |
As of 31 Dec 2025, 128 institutional investors reported holding 84,345,909 shares of Alector, Inc. - Common Stock (ALEC). This represents 76% of the company’s total 111,234,885 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Alector, Inc. - Common Stock (ALEC) together control 62% 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 |
|---|---|---|---|---|---|
| TCG Crossover Management, LLC | 9% | 10,000,000 | 0.52% | $15,600,000 | |
| BlackRock, Inc. | 6.4% | 7,147,766 | -0.7% | 0% | $11,150,515 |
| VANGUARD GROUP INC | 6.2% | 6,908,054 | +14% | 0% | $10,776,564 |
| Foresite Capital Management IV, LLC | 3.5% | 3,887,200 | 2.6% | $6,064,032 | |
| Merck & Co., Inc. | 3.2% | 3,545,719 | 0% | 2% | $5,531,322 |
| ACADIAN ASSET MANAGEMENT LLC | 3.1% | 3,442,449 | +45% | 0.01% | $5,362,000 |
| 683 Capital Management, LLC | 3% | 3,350,000 | +235% | 0.43% | $5,226,000 |
| Balyasny Asset Management L.P. | 2.9% | 3,265,575 | 0.01% | $5,094,297 | |
| D. E. Shaw & Co., Inc. | 2.1% | 2,365,151 | +142% | 0% | $3,689,636 |
| FMR LLC | 2% | 2,231,171 | -85% | 0% | $3,480,627 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 2% | 2,173,202 | +77% | 0.01% | $3,390,195 |
| Ikarian Capital, LLC | 1.9% | 2,082,606 | +174% | 0.42% | $3,248,866 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.9% | 2,075,220 | +11% | 0% | $3,238,029 |
| Kynam Capital Management, LP | 1.8% | 2,000,000 | 0.2% | $3,120,000 | |
| STATE STREET CORP | 1.6% | 1,814,298 | +4.6% | 0% | $2,830,305 |
| RENAISSANCE TECHNOLOGIES LLC | 1.4% | 1,543,650 | +63% | 0% | $2,408,094 |
| MEDICI CAPITAL LLC | 1.3% | 1,500,520 | +211% | 2.6% | $2,340,811 |
| MILLENNIUM MANAGEMENT LLC | 1.2% | 1,332,914 | +15% | 0% | $2,079,346 |
| Euclidean Capital LLC | 1.2% | 1,307,858 | 0% | 0.55% | $2,040,258 |
| MARSHALL WACE, LLP | 1% | 1,166,817 | +669% | 0% | $1,820,234 |
| Spruce Street Capital LP | 1% | 1,117,986 | 0% | 0.58% | $1,744,058 |
| ADAR1 Capital Management, LLC | 1% | 1,108,000 | 0.13% | $1,728,480 | |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 0.95% | 1,055,192 | 0% | 0.02% | $1,646,100 |
| TWO SIGMA INVESTMENTS, LP | 0.93% | 1,039,656 | +238% | 0% | $1,621,863 |
| DEUTSCHE BANK AG\ | 0.93% | 1,035,154 | -3.1% | 0% | $1,614,840 |
Institutional Holders of Alector, Inc. - Common Stock (ALEC) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 28,191,646 | $60,603,538 | +$1,846,376 | $2.15 | 64 |
| 2025 Q4 | 84,345,909 | $131,539,973 | -$373,040 | $1.56 | 128 |
| 2025 Q3 | 74,741,672 | $221,236,018 | +$17,794,200 | $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 |