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 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Oct 15, 2026 | Oct 14, 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 | — |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 27, 2026 | — |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure, Other events
|
Jun 30, 2026 | Jun 29, 2026 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jun 26, 2026 | Jun 25, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 11, 2026 | Jun 10, 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 | — |
| 10-Q | Quarterly report | May 8, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 8, 2026 | May 8, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 28, 2026 | — |
| ARS | Annual report to shareholders | Apr 20, 2026 | Dec 31, 2025 |
| DEF 14A | Proxy statement | Apr 20, 2026 | Apr 17, 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 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Apr 13, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Mar 23, 2026 | Mar 19, 2026 |
| 4 | Insider transaction | Mar 23, 2026 | Mar 19, 2026 |
| 10-K | Annual report | Mar 9, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| 3 | Initial insider ownership | Mar 5, 2026 | Feb 25, 2026 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2026 | Feb 27, 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 |
| 424B5 | Prospectus supplement | Jan 30, 2026 | — |
| 8-K |
Current report
Material agreement, Other events
|
Jan 30, 2026 | Jan 30, 2026 |
| 8-K |
Current report
Other events
|
Jan 30, 2026 | Jan 30, 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 |
| S-8 | Employee stock plan registration | Jan 21, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Jan 21, 2026 | Jan 21, 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 | — |
| 10-Q | Quarterly report | Nov 7, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2025 | Nov 7, 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 |
| 8-K |
Current report
Officer or director change, Other events
|
Sep 12, 2025 | Sep 11, 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 |
| 10-Q | Quarterly report | Aug 12, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Officer or director change, Other events
|
Aug 12, 2025 | Aug 12, 2025 |
| 4 | Insider transaction | Jul 8, 2025 | Jul 7, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jun 12, 2025 | Jun 11, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 8, 2025 | May 8, 2025 |
| 8-K |
Current report
Listing notice
|
Apr 25, 2025 | Apr 23, 2025 |
| EFFECT | Filing | Apr 24, 2025 | — |
| CORRESP | Letter to the SEC | Apr 23, 2025 | — |
| ARS | Annual report to shareholders | Apr 21, 2025 | Dec 31, 2024 |
| DEF 14A | Proxy statement | Apr 21, 2025 | Apr 21, 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 |
| UPLOAD | Letter from the SEC | Mar 11, 2025 | — |
| S-3 | Shelf registration | Mar 6, 2025 | — |
| 10-K | Annual report | Mar 6, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 6, 2025 | Mar 6, 2025 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change
|
Mar 5, 2025 | Feb 28, 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 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure, Other events
|
Jan 22, 2025 | Jan 16, 2025 |
| 8-K |
Current report
Officer or director change
|
Jan 17, 2025 | Jan 16, 2025 |
| S-8 | Employee stock plan registration | Jan 17, 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 |
| SC TO-I/A | Filing | Dec 31, 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 |
| SC TO-I | Filing | 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 | — |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure, Other events
|
Nov 14, 2024 | Nov 8, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Nov 7, 2024 | Nov 5, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 10, 2024 | — |
| 8-K |
Current report
Officer or director change
|
Oct 4, 2024 | Sep 30, 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 | — |
| 10-Q | Quarterly report | Aug 12, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 7, 2024 | Aug 5, 2024 |
| 3 | Initial insider ownership | Aug 7, 2024 | Aug 5, 2024 |
| 8-K |
Current report
Officer or director change, Other events
|
Aug 6, 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 |
| 8-K |
Current report
Shareholder vote results
|
Jun 17, 2024 | Jun 12, 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 | — |
| 10-Q | Quarterly report | May 9, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 9, 2024 | May 9, 2024 |
| 4 | Insider transaction | May 8, 2024 | May 6, 2024 |
| 144 | Notice of proposed sale | May 6, 2024 | — |
| DEFA14A | Additional proxy material | May 2, 2024 | — |
| 8-K |
Current report
Officer or director change
|
May 2, 2024 | Apr 28, 2024 |
| ARS | Annual report to shareholders | Apr 23, 2024 | Dec 31, 2023 |
| DEF 14A | Proxy statement | Apr 22, 2024 | Jun 12, 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 |
| S-8 | Employee stock plan registration | Mar 8, 2024 | — |
| 10-K | Annual report | Mar 7, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 7, 2024 | Mar 7, 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 |
| 8-K |
Current report
Material agreement, New debt
|
Dec 26, 2023 | Dec 22, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Dec 20, 2023 | — |
| 10-Q | Quarterly report | Nov 13, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2023 | Nov 13, 2023 |
| SC 13G | Ownership over 5% (passive) | Oct 16, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Oct 13, 2023 | — |
| 8-K |
Current report
Material agreement, Other events
|
Oct 6, 2023 | Oct 4, 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
- 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.