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 |
|---|---|---|---|
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 26, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 23, 2026 | — |
| 4 | Insider transaction | Oct 15, 2026 | Oct 13, 2026 |
| 4 | Insider transaction | Oct 15, 2026 | Oct 13, 2026 |
| 4 | Insider transaction | Oct 15, 2026 | Oct 14, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 18, 2026 | — |
| 4 | Insider transaction | Sep 4, 2026 | Sep 2, 2026 |
| 4 | Insider transaction | Sep 4, 2026 | Sep 3, 2026 |
| 4 | Insider transaction | Sep 4, 2026 | Sep 3, 2026 |
| 144 | Notice of proposed sale | Sep 4, 2026 | — |
| 144 | Notice of proposed sale | Sep 2, 2026 | — |
| 144 | Notice of proposed sale | Sep 1, 2026 | — |
| 144 | Notice of proposed sale | Sep 1, 2026 | — |
| 144 | Notice of proposed sale | Sep 1, 2026 | — |
| 4 | Insider transaction | Aug 21, 2026 | Aug 19, 2026 |
| 4 | Insider transaction | Jul 9, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 2, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 2, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 2, 2026 |
| 144 | Notice of proposed sale | Jun 3, 2026 | — |
| 144 | Notice of proposed sale | Jun 1, 2026 | — |
| 144 | Notice of proposed sale | Jun 1, 2026 | — |
| 144 | Notice of proposed sale | Jun 1, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 27, 2026 | — |
| 4 | Insider transaction | Apr 17, 2026 | Apr 16, 2026 |
| 144 | Notice of proposed sale | Apr 16, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 13, 2026 | Mar 13, 2026 |
| 4 | Insider transaction | Mar 13, 2026 | Mar 13, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 144 | Notice of proposed sale | Mar 10, 2026 | — |
| 4 | Insider transaction | Mar 3, 2026 | Mar 3, 2026 |
| 144 | Notice of proposed sale | Mar 3, 2026 | — |
| 4 | Insider transaction | Mar 3, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 2, 2026 |
| 144 | Notice of proposed sale | Feb 27, 2026 | — |
| 144 | Notice of proposed sale | Feb 27, 2026 | — |
| 144 | Notice of proposed sale | Feb 27, 2026 | — |
| 4 | Insider transaction | Feb 26, 2026 | Feb 26, 2026 |
| 144 | Notice of proposed sale | Feb 26, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 6, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 30, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 21, 2026 | — |
| 4 | Insider transaction | Dec 8, 2025 | Dec 5, 2025 |
| 144 | Notice of proposed sale | Dec 5, 2025 | — |
| 4 | Insider transaction | Dec 3, 2025 | Dec 3, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 3, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 3, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 3, 2025 |
| 144 | Notice of proposed sale | Dec 1, 2025 | — |
| 144 | Notice of proposed sale | Dec 1, 2025 | — |
| 144 | Notice of proposed sale | Dec 1, 2025 | — |
| 144 | Notice of proposed sale | Dec 1, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 13, 2025 | — |
| 4 | Insider transaction | Nov 12, 2025 | Nov 10, 2025 |
| 4 | Insider transaction | Nov 12, 2025 | Nov 10, 2025 |
| 4 | Insider transaction | Nov 12, 2025 | Nov 10, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 7, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 17, 2025 | — |
| 4 | Insider transaction | Sep 4, 2025 | Sep 2, 2025 |
| 4 | Insider transaction | Sep 4, 2025 | Sep 2, 2025 |
| 4 | Insider transaction | Sep 4, 2025 | Sep 2, 2025 |
| 4 | Insider transaction | Sep 4, 2025 | Sep 2, 2025 |
| 144 | Notice of proposed sale | Aug 29, 2025 | — |
| 144 | Notice of proposed sale | Aug 29, 2025 | — |
| 144 | Notice of proposed sale | Aug 29, 2025 | — |
| 144 | Notice of proposed sale | Aug 29, 2025 | — |
| 4 | Insider transaction | Aug 27, 2025 | Aug 26, 2025 |
| 144 | Notice of proposed sale | Aug 26, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 144 | Notice of proposed sale | Aug 8, 2025 | — |
| 4 | Insider transaction | Jul 1, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jul 1, 2025 |
| 3 | Initial insider ownership | Jun 30, 2025 | Jun 20, 2025 |
| 3 | Initial insider ownership | Jun 30, 2025 | Jun 20, 2025 |
| 4 | Insider transaction | Jun 23, 2025 | Jun 20, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 144 | Notice of proposed sale | May 30, 2025 | — |
| 144 | Notice of proposed sale | May 30, 2025 | — |
| 144 | Notice of proposed sale | May 30, 2025 | — |
| 4 | Insider transaction | May 2, 2025 | May 2, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 17, 2025 | — |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 144 | Notice of proposed sale | Feb 28, 2025 | — |
| 144 | Notice of proposed sale | Feb 28, 2025 | — |
| 144 | Notice of proposed sale | Feb 28, 2025 | — |
| 144 | Notice of proposed sale | Feb 28, 2025 | — |
| SC 13G | Ownership over 5% (passive) | Dec 6, 2024 | — |
| 4 | Insider transaction | Dec 3, 2024 | Dec 2, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Dec 2, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Dec 2, 2024 |
| 4 | Insider transaction | Dec 3, 2024 | Dec 2, 2024 |
| 144 | Notice of proposed sale | Nov 29, 2024 | — |
| 144 | Notice of proposed sale | Nov 29, 2024 | — |
| 144 | Notice of proposed sale | Nov 29, 2024 | — |
| 144 | Notice of proposed sale | Nov 29, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 7, 2024 | — |
| 4 | Insider transaction | Oct 10, 2024 | Aug 2, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Sep 4, 2024 | Sep 3, 2024 |
| 4 | Insider transaction | Sep 4, 2024 | Sep 3, 2024 |
| 4 | Insider transaction | Sep 4, 2024 | Sep 3, 2024 |
| 4 | Insider transaction | Sep 4, 2024 | Sep 3, 2024 |
| 144 | Notice of proposed sale | Aug 30, 2024 | — |
| 144 | Notice of proposed sale | Aug 30, 2024 | — |
| 144 | Notice of proposed sale | Aug 30, 2024 | — |
| 144 | Notice of proposed sale | Aug 30, 2024 | — |
| 4 | Insider transaction | Aug 23, 2024 | Aug 22, 2024 |
| 144 | Notice of proposed sale | Aug 22, 2024 | — |
| 4 | Insider transaction | Aug 13, 2024 | Aug 12, 2024 |
| 4 | Insider transaction | Aug 13, 2024 | Aug 12, 2024 |
| 144 | Notice of proposed sale | Aug 12, 2024 | — |
| 4 | Insider transaction | Jun 12, 2024 | Jun 12, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 12, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 12, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 12, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 12, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 12, 2024 |
| 4 | Insider transaction | Jun 4, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 4, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 4, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 4, 2024 | Jun 3, 2024 |
| 144 | Notice of proposed sale | May 31, 2024 | — |
| 144 | Notice of proposed sale | May 31, 2024 | — |
| 144 | Notice of proposed sale | May 31, 2024 | — |
| 144 | Notice of proposed sale | May 31, 2024 | — |
| 4 | Insider transaction | May 31, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 2, 2024 | Apr 30, 2024 |
| 4 | Insider transaction | Mar 21, 2024 | Mar 19, 2024 |
| 4 | Insider transaction | Mar 21, 2024 | Mar 19, 2024 |
| 3 | Initial insider ownership | Mar 21, 2024 | Mar 19, 2024 |
| 3 | Initial insider ownership | Mar 21, 2024 | Mar 19, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 4, 2024 |
| 144 | Notice of proposed sale | Mar 1, 2024 | — |
| 144 | Notice of proposed sale | Mar 1, 2024 | — |
| 144 | Notice of proposed sale | Mar 1, 2024 | — |
| 144 | Notice of proposed sale | Mar 1, 2024 | — |
| 4 | Insider transaction | Feb 14, 2024 | Jul 15, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 8, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 24, 2024 | — |
| 4 | Insider transaction | Dec 6, 2023 | Dec 4, 2023 |
| 4 | Insider transaction | Dec 6, 2023 | Dec 4, 2023 |
| 4 | Insider transaction | Dec 6, 2023 | Dec 5, 2023 |
| 4 | Insider transaction | Dec 6, 2023 | Dec 4, 2023 |
| 4 | Insider transaction | Dec 6, 2023 | Dec 4, 2023 |
| 144 | Notice of proposed sale | Dec 1, 2023 | — |
| 144 | Notice of proposed sale | Dec 1, 2023 | — |
| 144 | Notice of proposed sale | Dec 1, 2023 | — |
| 144 | Notice of proposed sale | Dec 1, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 13, 2023 | — |
| 4 | Insider transaction | Oct 3, 2023 | Oct 1, 2023 |
| 4 | Insider transaction | Oct 3, 2023 | Oct 1, 2023 |
| 4 | Insider transaction | Oct 3, 2023 | Oct 1, 2023 |
| 4 | Insider transaction | Oct 3, 2023 | Oct 1, 2023 |
| 4 | Insider transaction | Sep 13, 2023 | Sep 11, 2023 |
| 4 | Insider transaction | Sep 13, 2023 | Sep 11, 2023 |
| 144 | Notice of proposed sale | Sep 11, 2023 | — |
| 144 | Notice of proposed sale | Sep 11, 2023 | — |
| 144 | Notice of proposed sale | Sep 11, 2023 | — |
| 4 | Insider transaction | Sep 6, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 6, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 6, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 6, 2023 | Sep 5, 2023 |
Showing 200 filings, the most recent 200. 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.