Alx Oncology Holdings Inc SEC filings ALXO
Alx Oncology Holdings Inc has 421 filings in SEC EDGAR's recent list, going back to May 5, 2020. Its latest annual report, Form ARS, was filed on Apr 20, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 6, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 15, 2026 (material agreement, unregistered share sale). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 16, 2026 | — |
| 4 | Insider transaction | Aug 18, 2026 | Aug 17, 2026 |
| 4 | Insider transaction | Aug 18, 2026 | Aug 17, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 27, 2026 | — |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 27, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 28, 2026 | — |
| 4 | Insider transaction | Apr 17, 2026 | Apr 16, 2026 |
| 4 | Insider transaction | Apr 17, 2026 | Apr 16, 2026 |
| 3 | Initial insider ownership | Apr 17, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Mar 23, 2026 | Mar 19, 2026 |
| 4 | Insider transaction | Mar 23, 2026 | Mar 19, 2026 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| 3 | Initial insider ownership | Mar 5, 2026 | Feb 25, 2026 |
| 4 | Insider transaction | Feb 20, 2026 | Feb 18, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 17, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 9, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 6, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Feb 4, 2026 | — |
| 4 | Insider transaction | Feb 4, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Jan 28, 2026 | Jan 26, 2026 |
| 4 | Insider transaction | Jan 28, 2026 | Jan 26, 2026 |
| 4 | Insider transaction | Jan 28, 2026 | Jan 26, 2026 |
| 4 | Insider transaction | Jan 21, 2026 | Jan 20, 2026 |
| 4 | Insider transaction | Jan 21, 2026 | Jan 20, 2026 |
| 4 | Insider transaction | Jan 21, 2026 | Jan 20, 2026 |
| 4 | Insider transaction | Jan 21, 2026 | Jan 20, 2026 |
| 4 | Insider transaction | Jan 21, 2026 | Jan 20, 2026 |
| 4 | Insider transaction | Jan 21, 2026 | Jan 20, 2026 |
| 4 | Insider transaction | Jan 7, 2026 | Jan 6, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 22, 2025 | — |
| 4 | Insider transaction | Oct 16, 2025 | Oct 14, 2025 |
| 4 | Insider transaction | Oct 16, 2025 | Oct 14, 2025 |
| 4 | Insider transaction | Oct 16, 2025 | Oct 14, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 8, 2025 | — |
| 4 | Insider transaction | Sep 19, 2025 | Sep 17, 2025 |
| 4 | Insider transaction | Sep 18, 2025 | Sep 16, 2025 |
| 4 | Insider transaction | Aug 20, 2025 | Aug 18, 2025 |
| 4 | Insider transaction | Aug 19, 2025 | Aug 15, 2025 |
| 4 | Insider transaction | Aug 19, 2025 | Aug 15, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Aug 13, 2025 | Aug 12, 2025 |
| 3 | Initial insider ownership | Aug 13, 2025 | Aug 12, 2025 |
| 4 | Insider transaction | Jul 8, 2025 | Jul 7, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jun 30, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 14, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 14, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 3 | Initial insider ownership | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 3 | Initial insider ownership | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 3 | Initial insider ownership | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 23, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 8, 2025 | Jan 6, 2025 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 30, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 30, 2024 |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 27, 2024 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Dec 6, 2024 | — |
| 4 | Insider transaction | Dec 4, 2024 | Dec 2, 2024 |
| 4 | Insider transaction | Dec 4, 2024 | Dec 2, 2024 |
| 4 | Insider transaction | Dec 4, 2024 | Dec 2, 2024 |
| 4 | Insider transaction | Nov 19, 2024 | Nov 18, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 10, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Aug 22, 2024 | — |
| 4 | Insider transaction | Aug 16, 2024 | Aug 14, 2024 |
| 4 | Insider transaction | Aug 16, 2024 | Aug 14, 2024 |
| 4 | Insider transaction | Aug 16, 2024 | Aug 14, 2024 |
| 4 | Insider transaction | Aug 16, 2024 | Aug 14, 2024 |
| 4 | Insider transaction | Aug 16, 2024 | Aug 14, 2024 |
| SC 13G | Ownership over 5% (passive) | Aug 13, 2024 | — |
| 4 | Insider transaction | Aug 7, 2024 | Aug 5, 2024 |
| 3 | Initial insider ownership | Aug 7, 2024 | Aug 5, 2024 |
| 4 | Insider transaction | Jul 15, 2024 | Jul 11, 2024 |
| 144 | Notice of proposed sale | Jul 11, 2024 | — |
| 4 | Insider transaction | Jul 9, 2024 | Jul 5, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jul 3, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Jun 28, 2024 |
| 4/A | Filing | Jun 24, 2024 | Jun 13, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 13, 2024 |
| 4 | Insider transaction | Jun 14, 2024 | Jun 13, 2024 |
| 4 | Insider transaction | Jun 14, 2024 | Jun 13, 2024 |
| 4 | Insider transaction | Jun 14, 2024 | Jun 13, 2024 |
| 4 | Insider transaction | Jun 6, 2024 | Jun 4, 2024 |
| 144 | Notice of proposed sale | Jun 4, 2024 | — |
| 4 | Insider transaction | May 15, 2024 | May 13, 2024 |
| 144 | Notice of proposed sale | May 13, 2024 | — |
| 4 | Insider transaction | May 8, 2024 | May 6, 2024 |
| 144 | Notice of proposed sale | May 6, 2024 | — |
| 4 | Insider transaction | Apr 18, 2024 | Apr 16, 2024 |
| 144 | Notice of proposed sale | Apr 16, 2024 | — |
| 4 | Insider transaction | Apr 5, 2024 | Apr 4, 2024 |
| 144 | Notice of proposed sale | Apr 4, 2024 | — |
| 4 | Insider transaction | Mar 18, 2024 | Mar 14, 2024 |
| 4 | Insider transaction | Feb 16, 2024 | Feb 14, 2024 |
| 4 | Insider transaction | Feb 16, 2024 | Feb 14, 2024 |
| 4 | Insider transaction | Feb 16, 2024 | Feb 14, 2024 |
| 4 | Insider transaction | Feb 16, 2024 | Feb 14, 2024 |
| 4 | Insider transaction | Feb 16, 2024 | Feb 14, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| 4 | Insider transaction | Jan 5, 2024 | Jan 4, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 29, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 29, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 29, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 29, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Dec 20, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 16, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 13, 2023 | — |
| 4 | Insider transaction | Sep 12, 2023 | Sep 8, 2023 |
| 4 | Insider transaction | Jul 27, 2023 | Jul 25, 2023 |
| 4 | Insider transaction | Jul 27, 2023 | Jul 25, 2023 |
| 4 | Insider transaction | Jul 27, 2023 | Jul 25, 2023 |
| 4 | Insider transaction | Jul 27, 2023 | Jul 25, 2023 |
| 4 | Insider transaction | Jul 7, 2023 | Jul 6, 2023 |
| 4 | Insider transaction | Jul 5, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jul 5, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jul 5, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jul 5, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jun 22, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 22, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 22, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 22, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 22, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 22, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 13, 2023 | Jun 9, 2023 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| 4 | Insider transaction | Jan 3, 2023 | Dec 29, 2022 |
| 4 | Insider transaction | Jan 3, 2023 | Dec 29, 2022 |
| 4 | Insider transaction | Jan 3, 2023 | Dec 29, 2022 |
| 4 | Insider transaction | Jan 3, 2023 | Dec 29, 2022 |
| 4 | Insider transaction | Dec 20, 2022 | Dec 16, 2022 |
| 4 | Insider transaction | Nov 29, 2022 | Nov 28, 2022 |
| 3 | Initial insider ownership | Nov 29, 2022 | Nov 28, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Aug 10, 2022 | — |
| 4 | Insider transaction | Aug 9, 2022 | Aug 5, 2022 |
| 4 | Insider transaction | Aug 9, 2022 | Aug 5, 2022 |
| 4 | Insider transaction | Aug 9, 2022 | Aug 5, 2022 |
| 4 | Insider transaction | Aug 9, 2022 | Aug 5, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 15, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Jun 10, 2022 | — |
| 4 | Insider transaction | Apr 14, 2022 | Apr 11, 2022 |
| 3 | Initial insider ownership | Apr 14, 2022 | Apr 11, 2022 |
| SC 13G | Ownership over 5% (passive) | Feb 9, 2022 | — |
| 4 | Insider transaction | Feb 8, 2022 | Feb 7, 2022 |
| 4 | Insider transaction | Feb 7, 2022 | Feb 3, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 4, 2022 | — |
| 4 | Insider transaction | Feb 1, 2022 | Jan 28, 2022 |
| 4 | Insider transaction | Dec 16, 2021 | Dec 15, 2021 |
| 4 | Insider transaction | Dec 15, 2021 | Dec 13, 2021 |
| 4 | Insider transaction | Dec 15, 2021 | Dec 13, 2021 |
| 4 | Insider transaction | Dec 10, 2021 | Dec 8, 2021 |
| 4 | Insider transaction | Dec 10, 2021 | Dec 8, 2021 |
| 4 | Insider transaction | Nov 23, 2021 | Nov 22, 2021 |
| 4 | Insider transaction | Oct 20, 2021 | Oct 19, 2021 |
| 4 | Insider transaction | Oct 20, 2021 | Oct 19, 2021 |
| 4 | Insider transaction | Oct 19, 2021 | Oct 18, 2021 |
| 4 | Insider transaction | Oct 12, 2021 | Oct 11, 2021 |
| 4 | Insider transaction | Sep 21, 2021 | Sep 20, 2021 |
| 4 | Insider transaction | Sep 17, 2021 | Sep 16, 2021 |
| 4 | Insider transaction | Sep 13, 2021 | Sep 10, 2021 |
| SC 13G | Ownership over 5% (passive) | Sep 10, 2021 | — |
| 4 | Insider transaction | Aug 24, 2021 | Aug 23, 2021 |
| 4 | Insider transaction | Aug 20, 2021 | Aug 19, 2021 |
| 4 | Insider transaction | Aug 18, 2021 | Aug 17, 2021 |
| 4 | Insider transaction | Aug 11, 2021 | Aug 10, 2021 |
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
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- ALXO (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- South San Francisco, CA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1810182
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.