13F reference period
Q2 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 Q3 2026
Institutions Reporting
140
Shares (Excl. Options)
91.24M
Full value: 91,236,831 · shares · 30 Jun 2026Price
$2.01
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.
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- Security type / class
- Equity / Common Stock, $0.0001 par value per share
- Symbol
- ALEC on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 91,236,831
- Total 13F value
- $183,385,438
- Portfolio coverage rank
- 0%
- Share change
- +2,868,768
- Value change
- +$5,138,268
- Number of holders
- 140
- Shares outstanding
- 147,058,824
- SEC-reported price per share
- $1.87
- Insider filing price
- $1.87
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
Filing notes and source
Key facts
- ALEC - Alector, Inc. - Common Stock, $0.0001 par value per share is tracked under CUSIP 014442107.
- 140 institutions reported positions in Q2 2026.
- 8 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 138 to 140 between Q1 2026 and Q2 2026.
- SEC-reported value moved from to
$189.99M
Full value: $189,989,177 · USD · 31 Mar 2026.$183.39M
Full value: $183,385,438 · USD · 30 Jun 2026
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 140 institutions filings for Q2 2026.
Security key
014442107
13F reference period
Q2 2026
13F holders
140
13D/G owners
8
CIK / CUSIP context first
Open Q2 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
8
Security
ALEC
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Deep Track Capital, LP | 8.6% | $23,642,531 | 12,772,152 | Deep Track Capital, LP | 16 Oct 2026 | |||
| TCG Crossover GP II, LLC | 9.2% | $29,600,000 | 10,000,000 | Chen Yu | 22 Oct 2025 | |||
| BIOTECHNOLOGY VALUE FUND L P | 8.4% | $21,935,785 | 9,374,267 | BVF PARTNERS L P/IL | 11 Sep 2026 | |||
| Rosenthal Arnon | 7.4% | $12,813,723 | 8,213,925 | Arnon Rosenthal | 31 Dec 2025 | |||
| RA CAPITAL MANAGEMENT, L.P. | 5.1% | $13,883,250 | +$13,883,250 | 7,500,000 | RA Capital Management, L.P. | 19 Oct 2026 | ||
| 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 30 Jun 2026,
140
institutional investors reported holding
shares of
Alector, Inc. - Common Stock, $0.0001 par value per share (ALEC).
This represents
62%
of the company’s total
outstanding shares.
91.24M
Full value: 91,236,831 · shares · 30 Jun 2026147.06M
Full value: 147,058,824 · shares · Stored outstanding share count13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
51%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| TCG Crossover Management, LLC | 6.8% | 10,000,000 | 0% | 0.48% | $20,100,000 |
| BlackRock, Inc. | 5.3% | 7,847,879 | +1.4% | 0% | $15,774,236 |
| ACADIAN ASSET MANAGEMENT LLC | 3% | 4,414,345 | +9.3% | 0.01% | $8,863,000 |
| Nantahala Capital Management, LLC | 2.9% | 4,318,109 | +53% | 0.52% | $8,679,399 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.7% | 4,009,340 | +9% | 0% | $8,058,773 |
| Kynam Capital Management, LP | 2.6% | 3,808,494 | +90% | 0.42% | $7,655,073 |
| Merck & Co., Inc. | 2.4% | 3,545,719 | 0% | 1.4% | $7,126,896 |
| Balyasny Asset Management L.P. | 2.2% | 3,247,426 | +11% | 0.01% | $6,527,326 |
| 683 Capital Management, LLC | 2.2% | 3,200,000 | 0% | 0.59% | $6,432,000 |
| D. E. Shaw & Co., Inc. | 2% | 2,959,983 | -11% | 0% | $5,949,566 |
| ADAR1 Capital Management, LLC | 2% | 2,883,583 | +175% | 0.27% | $5,796,002 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1.9% | 2,820,493 | +9.2% | 0% | $5,669,191 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.7% | 2,454,271 | +7.4% | 0% | $4,934,077 |
| Spruce Street Capital LP | 1.4% | 2,101,068 | 0% | 0.83% | $4,223,147 |
| MILLENNIUM MANAGEMENT LLC | 1.4% | 1,988,835 | +0.49% | 0% | $3,997,558 |
| Ikarian Capital, LLC | 1.3% | 1,982,606 | -4.8% | 0.66% | $3,985,038 |
| STATE STREET CORP | 1.3% | 1,879,765 | +0.76% | 0% | $3,778,328 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 1.2% | 1,765,929 | -18% | 0.01% | $3,549,517 |
| MEDICI CAPITAL LLC | 1.1% | 1,652,520 | 0% | 6.5% | $3,321,565 |
| Affinity Asset Advisors, LLC | 1% | 1,510,000 | +202% | 0.15% | $3,035,100 |
| Eversept Partners, LP | 0.97% | 1,423,873 | +5.4% | 0.16% | $2,861,985 |
| FMR LLC | 0.95% | 1,396,398 | -22% | 0% | $2,806,759 |
| AQR CAPITAL MANAGEMENT LLC | 0.89% | 1,309,577 | +84% | 0% | $2,632,249 |
| Euclidean Capital LLC | 0.89% | 1,307,858 | 0% | 0.6% | $2,628,795 |
| MACKENZIE FINANCIAL CORP | 0.75% | 1,109,770 | +29% | 0% | $2,230,638 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
31
Headline period
Q2 2026
Rows shown
1-25 of 31
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q3 | 165,221 | $305,911 | -$65,022 | $1.85 | 16 |
| 2026 Q2 | 91,236,831 | $183,385,438 | +$5,138,268 | $2.01 | 140 |
| 2026 Q1 | 88,395,892 | $189,989,177 | +$10,033,251 | $2.15 | 138 |
| 2025 Q4 | 84,346,669 | $131,541,158 | -$373,194 | $1.56 | 130 |
| 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 |