Latest Period
Q1 2026
Security Snapshot
Alector, Inc. - Common Stock, $0.0001 par value per share (ALEC) Institutional Ownership
CUSIP: 014442107
13F Institutional Holders and Ownership History from Q1 2019 to Q1 2026
Institutions Reporting
137
Shares (Excl. Options)
88,395,563
Price
$2.15
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- Security type / class
- Equity / Common Stock, $0.0001 par value per share
- Symbol
- ALEC on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 88,395,563
- Total 13F value
- $189,988,470
- Portfolio coverage rank
- 0%
- Share change
- +4,088,139
- Value change
- +$10,033,251
- Number of holders
- 137
- Shares outstanding
- 110,074,447
- SEC-reported price per share
- $2.16
- Insider filing price
- $2.16
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ALEC - Alector, Inc. - Common Stock, $0.0001 par value per share is tracked under CUSIP 014442107.
- 137 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 129 to 137 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $131,540,645 to $189,988,470.
Research use
- 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.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 137 institutions filings for Q1 2026.
Security key
014442107
Latest holder period
Q1 2026
13F holders
137
13D/G owners
5
CIK / CUSIP context first
Open Q1 2026 holders
ALEC full holder history
Alector, Inc. SEC filings
Alector, Inc. company facts
Alector, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 014442107:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
ALEC
| 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 | |||
| BlackRock, Inc. | 5.2% | +10% | $12,436,060 | +$1,299,479 | 5,784,214 | +12% | BlackRock, Inc. | 31 Mar 2026 |
| Polaris Venture Partners VI, L.P. | 4.7% | -26% | $12,157,723 | -$4,516,117 | 5,173,499 | -27% | Terrance G. McGuire | 31 Mar 2026 |
| FMR LLC | 3.6% | $10,655,467 | 3,599,820 | FMR LLC | 31 Oct 2025 |
As of 31 Mar 2026, 137 institutional investors reported holding 88,395,563 shares of Alector, Inc. - Common Stock, $0.0001 par value per share (ALEC). This represents 80% of the company’s total 110,074,447 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
65%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| TCG Crossover Management, LLC | 9.1% | 10,000,000 | 0% | 0.62% | $21,500,000 |
| BlackRock, Inc. | 7% | 7,741,245 | +8.3% | 0% | $16,643,677 |
| ACADIAN ASSET MANAGEMENT LLC | 3.7% | 4,038,785 | +17% | 0.01% | $8,675,000 |
| Foresite Capital Management IV, LLC | 3.5% | 3,887,200 | 0% | 3.5% | $8,357,480 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.3% | 3,678,722 | 0% | 0% | $7,909,252 |
| Merck & Co., Inc. | 3.2% | 3,545,719 | 0% | 2.2% | $7,623,297 |
| D. E. Shaw & Co., Inc. | 3% | 3,332,835 | +41% | 0.01% | $7,165,596 |
| 683 Capital Management, LLC | 2.9% | 3,200,000 | -4.5% | 0.64% | $6,880,000 |
| Balyasny Asset Management L.P. | 2.7% | 2,935,253 | -10% | 0.01% | $6,310,794 |
| Nantahala Capital Management, LLC | 2.6% | 2,815,983 | 0.38% | $6,054,363 | |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2.3% | 2,583,542 | 0% | 0% | $5,554,615 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 2,286,218 | +10% | 0% | $4,916,361 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 2% | 2,154,361 | -0.87% | 0.02% | $4,631,876 |
| Spruce Street Capital LP | 1.9% | 2,101,068 | +88% | 1.1% | $4,517,296 |
| Ikarian Capital, LLC | 1.9% | 2,082,606 | 0% | 0.64% | $4,477,603 |
| Kynam Capital Management, LP | 1.8% | 2,000,000 | 0% | 0.27% | $4,300,000 |
| MILLENNIUM MANAGEMENT LLC | 1.8% | 1,979,226 | +48% | 0% | $4,255,336 |
| STATE STREET CORP | 1.7% | 1,865,526 | +2.8% | 0% | $4,010,881 |
| FMR LLC | 1.6% | 1,796,104 | -19% | 0% | $3,861,624 |
| MEDICI CAPITAL LLC | 1.5% | 1,652,520 | +10% | 5% | $3,552,918 |
| Eversept Partners, LP | 1.2% | 1,351,106 | +34% | 0.19% | $2,904,878 |
| Euclidean Capital LLC | 1.2% | 1,307,858 | 0% | 0.72% | $2,811,895 |
| RENAISSANCE TECHNOLOGIES LLC | 1.2% | 1,287,691 | -17% | 0% | $2,768,536 |
| TWO SIGMA INVESTMENTS, LP | 1.2% | 1,279,306 | +23% | 0% | $2,750,508 |
| DEUTSCHE BANK AG\ | 0.99% | 1,092,903 | +5.6% | 0% | $2,349,741 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
29
Latest
Q1 2026
Rows shown
1-25 of 29
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 88,395,563 | $189,988,470 | +$10,033,251 | $2.15 | 137 |
| 2025 Q4 | 84,346,340 | $131,540,645 | -$373,194 | $1.56 | 129 |
| 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 |