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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2026 | Nov 5, 2026 |
| 424B5 | Prospectus supplement | Oct 16, 2026 | — |
| 8-K |
Current report
Material agreement, Other events
|
Oct 16, 2026 | Oct 15, 2026 |
| FWP | Free writing prospectus | Oct 16, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Oct 14, 2026 | Oct 13, 2026 |
| 8-K |
Current report
Material agreement, Results of operations, Regulation FD disclosure, Other events
|
Oct 5, 2026 | Sep 30, 2026 |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| 8-K |
Current report
Agreement ended
|
Jul 8, 2026 | Jul 6, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 17, 2026 | Jun 17, 2026 |
| 8-K |
Current report
Material agreement
|
May 7, 2026 | May 7, 2026 |
| 424B5 | Prospectus supplement | May 7, 2026 | — |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 2026 |
| EFFECT | Filing | Apr 30, 2026 | — |
| CORRESP | Letter to the SEC | Apr 28, 2026 | — |
| ARS | Annual report to shareholders | Apr 28, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 28, 2026 | — |
| DEF 14A | Proxy statement | Apr 28, 2026 | Apr 21, 2026 |
| UPLOAD | Letter from the SEC | Mar 17, 2026 | — |
| S-3 | Shelf registration | Mar 12, 2026 | — |
| S-8 | Employee stock plan registration | Feb 25, 2026 | — |
| 10-K | Annual report | Feb 25, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2026 | Feb 25, 2026 |
| 8-K |
Current report
Officer or director change
|
Dec 12, 2025 | Dec 10, 2025 |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2025 | Nov 6, 2025 |
| 8-K |
Current report
Results of operations, Exit or restructuring costs, Officer or director change, Regulation FD disclosure
|
Oct 21, 2025 | Oct 20, 2025 |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2025 | Aug 7, 2025 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 13, 2025 | Jun 9, 2025 |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 8, 2025 | May 8, 2025 |
| ARS | Annual report to shareholders | Apr 25, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 24, 2025 | — |
| DEF 14A | Proxy statement | Apr 24, 2025 | Apr 22, 2025 |
| 8-K |
Current report
Officer or director change
|
Mar 28, 2025 | Mar 25, 2025 |
| 8-K |
Current report
Exit or restructuring costs
|
Mar 10, 2025 | Mar 7, 2025 |
| S-8 | Employee stock plan registration | Feb 26, 2025 | — |
| 10-K | Annual report | Feb 26, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 26, 2025 | Feb 26, 2025 |
| 8-K |
Current report
Other events
|
Jan 10, 2025 | Jan 9, 2025 |
| 8-K |
Current report
Exit or restructuring costs, Regulation FD disclosure
|
Nov 25, 2024 | Nov 25, 2024 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Nov 14, 2024 | Nov 14, 2024 |
| 10-Q | Quarterly report | Nov 6, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2024 | Nov 6, 2024 |
| 10-Q | Quarterly report | Aug 7, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2024 | Aug 7, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Jun 12, 2024 | Jun 12, 2024 |
| 10-Q | Quarterly report | May 8, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 8, 2024 | May 8, 2024 |
| ARS | Annual report to shareholders | Apr 25, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 25, 2024 | — |
| DEF 14A | Proxy statement | Apr 25, 2024 | Jun 12, 2024 |
| 8-K |
Current report
Officer or director change
|
Mar 21, 2024 | Mar 15, 2024 |
| S-8 | Employee stock plan registration | Feb 27, 2024 | — |
| 10-K | Annual report | Feb 27, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2024 | Feb 27, 2024 |
| 8-K |
Current report
Material agreement, Other events
|
Jan 19, 2024 | Jan 17, 2024 |
| 424B5 | Prospectus supplement | Jan 19, 2024 | — |
| 8-K |
Current report
Results of operations
|
Jan 16, 2024 | Jan 16, 2024 |
| 424B5 | Prospectus supplement | Jan 16, 2024 | — |
| 8-K |
Current report
Material agreement
|
Nov 7, 2023 | Nov 7, 2023 |
| 424B5 | Prospectus supplement | Nov 7, 2023 | — |
| 10-Q | Quarterly report | Nov 7, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2023 | Nov 7, 2023 |
| 10-Q | Quarterly report | Aug 3, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2023 | Aug 3, 2023 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 15, 2023 | Jun 10, 2023 |
| EFFECT | Filing | May 5, 2023 | — |
| 10-Q | Quarterly report | May 4, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 4, 2023 | May 4, 2023 |
| POS AM | Filing | May 2, 2023 | — |
| EFFECT | Filing | May 1, 2023 | — |
| CORRESP | Letter to the SEC | Apr 27, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Apr 27, 2023 | Apr 25, 2023 |
| DEFA14A | Additional proxy material | Apr 27, 2023 | — |
| DEF 14A | Proxy statement | Apr 27, 2023 | — |
| 8-K |
Current report
Exit or restructuring costs
|
Mar 29, 2023 | Mar 28, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 13, 2023 | Mar 10, 2023 |
| UPLOAD | Letter from the SEC | Mar 7, 2023 | — |
| S-3 | Shelf registration | Feb 28, 2023 | — |
| S-8 | Employee stock plan registration | Feb 28, 2023 | — |
| 10-K | Annual report | Feb 28, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 28, 2023 | Feb 28, 2023 |
| 10-Q | Quarterly report | Nov 8, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2022 | Nov 8, 2022 |
| 8-K |
Current report
Officer or director change
|
Oct 6, 2022 | Oct 3, 2022 |
| S-8 | Employee stock plan registration | Sep 26, 2022 | — |
| 8-K |
Current report
Officer or director change
|
Sep 26, 2022 | Sep 22, 2022 |
| 10-Q | Quarterly report | Aug 4, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2022 | Aug 4, 2022 |
| 8-K |
Current report
Other events
|
Jul 7, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 21, 2022 | Jun 16, 2022 |
| DEFR14A | Filing | May 27, 2022 | — |
| 10-Q | Quarterly report | May 5, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 5, 2022 | May 5, 2022 |
| DEFA14A | Additional proxy material | Apr 28, 2022 | — |
| DEF 14A | Proxy statement | Apr 28, 2022 | Jun 16, 2022 |
| 8-K |
Current report
Officer or director change
|
Mar 29, 2022 | Mar 29, 2022 |
| S-8 | Employee stock plan registration | Feb 24, 2022 | — |
| 10-K | Annual report | Feb 24, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2022 | Feb 24, 2022 |
| 8-K |
Current report
Officer or director change
|
Feb 7, 2022 | Feb 7, 2022 |
| 8-K |
Current report
Officer or director change
|
Jan 3, 2022 | Dec 31, 2021 |
| S-8 | Employee stock plan registration | Jan 3, 2022 | — |
| 8-K |
Current report
Officer or director change
|
Jan 3, 2022 | Jan 1, 2022 |
| 8-K |
Current report
Officer or director change
|
Dec 15, 2021 | Dec 15, 2021 |
| 10-Q | Quarterly report | Nov 4, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2021 | Nov 4, 2021 |
| 8-K |
Current report
Officer or director change
|
Sep 28, 2021 | Sep 23, 2021 |
| 8-K |
Current report
Officer or director change
|
Sep 8, 2021 | Sep 8, 2021 |
| 8-K |
Current report
Officer or director change
|
Sep 7, 2021 | Sep 7, 2021 |
| 10-Q | Quarterly report | Aug 3, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2021 | Aug 3, 2021 |
| 8-K |
Current report
Other events
|
Jul 29, 2021 | Jul 29, 2021 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jul 7, 2021 | Jul 1, 2021 |
| 8-K |
Current report
Shareholder vote results
|
Jun 21, 2021 | Jun 17, 2021 |
| 10-Q | Quarterly report | May 5, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
May 5, 2021 | May 5, 2021 |
| DEFA14A | Additional proxy material | Apr 28, 2021 | — |
| DEF 14A | Proxy statement | Apr 28, 2021 | Jun 17, 2021 |
| 10-K/A | Amended annual report | Mar 29, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Officer or director change
|
Mar 26, 2021 | Mar 23, 2021 |
| 8-K |
Current report
Officer or director change
|
Mar 5, 2021 | Mar 1, 2021 |
| S-8 | Employee stock plan registration | Feb 25, 2021 | — |
| 10-K | Annual report | Feb 25, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2021 | Feb 25, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 20, 2021 | Jan 20, 2021 |
| 10-Q | Quarterly report | Nov 10, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2020 | Nov 10, 2020 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Oct 6, 2020 | Sep 30, 2020 |
| 10-Q | Quarterly report | Aug 11, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2020 | Aug 11, 2020 |
| 8-K |
Current report
Shareholder vote results
|
May 15, 2020 | May 11, 2020 |
| 8-K |
Current report
Material agreement
|
May 13, 2020 | May 13, 2020 |
| 424B5 | Prospectus supplement | May 13, 2020 | — |
| S-3ASR | Automatic shelf registration | May 13, 2020 | — |
| 10-Q | Quarterly report | May 13, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations
|
May 13, 2020 | May 13, 2020 |
| DEFA14A | Additional proxy material | Mar 30, 2020 | — |
| DEF 14A | Proxy statement | Mar 30, 2020 | May 11, 2020 |
| S-8 | Employee stock plan registration | Mar 24, 2020 | — |
| 10-K | Annual report | Mar 24, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Mar 24, 2020 | Mar 20, 2020 |
| 8-K |
Current report
Officer or director change
|
Mar 9, 2020 | Mar 5, 2020 |
| 8-K |
Current report
Material agreement, Other events
|
Feb 4, 2020 | Jan 29, 2020 |
| 424B4 | Prospectus | Jan 30, 2020 | — |
| EFFECT | Filing | Jan 29, 2020 | — |
| S-1MEF | Filing | Jan 29, 2020 | — |
| S-1/A | Amended registration statement | Jan 29, 2020 | — |
| CORRESP | Letter to the SEC | Jan 27, 2020 | — |
| CORRESP | Letter to the SEC | Jan 27, 2020 | — |
| S-1 | Registration statement | Jan 27, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Dec 13, 2019 | Dec 13, 2019 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Dec 11, 2019 | Dec 11, 2019 |
| UPLOAD | Letter from the SEC | Dec 4, 2019 | — |
| DRSLTR | Filing | Dec 2, 2019 | — |
| DRS | Filing | Dec 2, 2019 | — |
| 10-Q | Quarterly report | Nov 12, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2019 | Nov 12, 2019 |
| 10-Q | Quarterly report | Aug 12, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2019 | Aug 12, 2019 |
| 8-K |
Current report
Officer or director change
|
Aug 12, 2019 | Aug 9, 2019 |
| 8-K |
Current report
Officer or director change
|
Jun 13, 2019 | Jun 8, 2019 |
| 8-K |
Current report
Shareholder vote results
|
May 16, 2019 | May 10, 2019 |
| 10-Q | Quarterly report | May 13, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations
|
May 13, 2019 | May 13, 2019 |
| DEFA14A | Additional proxy material | Mar 27, 2019 | — |
| DEF 14A | Proxy statement | Mar 27, 2019 | May 10, 2019 |
| 10-K | Annual report | Mar 26, 2019 | Dec 31, 2018 |
| 8-K |
Current report
Results of operations, Officer or director change, Regulation FD disclosure
|
Mar 26, 2019 | Mar 21, 2019 |
| 8-K |
Current report
Bylaw or fiscal year change, Other events
|
Feb 11, 2019 | Feb 11, 2019 |
| S-8 | Employee stock plan registration | Feb 7, 2019 | — |
| 424B4 | Prospectus | Feb 7, 2019 | — |
| EFFECT | Filing | Feb 6, 2019 | — |
| FWP | Free writing prospectus | Feb 6, 2019 | — |
| S-1/A | Amended registration statement | Feb 6, 2019 | — |
| CT ORDER | Filing | Feb 6, 2019 | — |
| CORRESP | Letter to the SEC | Feb 4, 2019 | — |
| CORRESP | Letter to the SEC | Feb 4, 2019 | — |
| CERT | Filing | Feb 4, 2019 | — |
| 8-A12B | Filing | Jan 31, 2019 | — |
| S-1/A | Amended registration statement | Jan 29, 2019 | — |
| CORRESP | Letter to the SEC | Jan 7, 2019 | — |
| CORRESP | Letter to the SEC | Jan 7, 2019 | — |
| S-1 | Registration statement | Jan 7, 2019 | — |
| UPLOAD | Letter from the SEC | Dec 20, 2018 | — |
| DRSLTR | Filing | Dec 17, 2018 | — |
| UPLOAD | Letter from the SEC | Dec 4, 2018 | — |
| DRSLTR | Filing | Nov 16, 2018 | — |
| DRS/A | Filing | Nov 16, 2018 | — |
| UPLOAD | Letter from the SEC | Nov 7, 2018 | — |
| DRSLTR | Filing | Oct 12, 2018 | — |
| DRS | Filing | Oct 12, 2018 | — |
| D | Filing | Sep 16, 2015 | — |
Showing 197 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.