Alector, Inc. SEC filings ALEC
Alector, Inc. has 631 filings in SEC EDGAR's recent list, going back to Sep 16, 2015. Its latest annual report, Form ARS, was filed on Apr 28, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 5, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 424B5 | Prospectus supplement | Oct 16, 2026 | — |
| FWP | Free writing prospectus | Oct 16, 2026 | — |
| 424B5 | Prospectus supplement | May 7, 2026 | — |
| S-3 | Shelf registration | Mar 12, 2026 | — |
| S-8 | Employee stock plan registration | Feb 25, 2026 | — |
| S-8 | Employee stock plan registration | Feb 26, 2025 | — |
| S-8 | Employee stock plan registration | Feb 27, 2024 | — |
| 424B5 | Prospectus supplement | Jan 19, 2024 | — |
| 424B5 | Prospectus supplement | Jan 16, 2024 | — |
| 424B5 | Prospectus supplement | Nov 7, 2023 | — |
| POS AM | Filing | May 2, 2023 | — |
| S-3 | Shelf registration | Feb 28, 2023 | — |
| S-8 | Employee stock plan registration | Feb 28, 2023 | — |
| S-8 | Employee stock plan registration | Sep 26, 2022 | — |
| S-8 | Employee stock plan registration | Feb 24, 2022 | — |
| S-8 | Employee stock plan registration | Jan 3, 2022 | — |
| S-8 | Employee stock plan registration | Feb 25, 2021 | — |
| 424B5 | Prospectus supplement | May 13, 2020 | — |
| S-3ASR | Automatic shelf registration | May 13, 2020 | — |
| S-8 | Employee stock plan registration | Mar 24, 2020 | — |
| 424B4 | Prospectus | Jan 30, 2020 | — |
| S-1MEF | Filing | Jan 29, 2020 | — |
| S-1/A | Amended registration statement | Jan 29, 2020 | — |
| S-1 | Registration statement | Jan 27, 2020 | — |
| S-8 | Employee stock plan registration | Feb 7, 2019 | — |
| 424B4 | Prospectus | Feb 7, 2019 | — |
| FWP | Free writing prospectus | Feb 6, 2019 | — |
| S-1/A | Amended registration statement | Feb 6, 2019 | — |
| S-1/A | Amended registration statement | Jan 29, 2019 | — |
| S-1 | Registration statement | Jan 7, 2019 | — |
Showing 30 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Biological Products, (No Diagnostic Substances) (SIC 2836)
- Listed as
- ALEC (Nasdaq)
- Fiscal year ends
- December 31
- Headquarters
- South San Francisco, CA
- SEC filer status
- Accelerated filer, Smaller reporting company
- SEC CIK
- 1653087
- Former names
- Alector LLC (until Sep 16, 2015)
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All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.