Cero Therapeutics Holdings, Inc. SEC filings CERO
Cero Therapeutics Holdings, Inc. has 445 filings in SEC EDGAR's recent list, going back to Jul 8, 2021. Its latest annual report, Form 10-K, was filed on Apr 15, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 14, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 7, 2026 (material agreement). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| 4 | Insider transaction | Apr 21, 2026 | Mar 4, 2026 |
| 3 | Initial insider ownership | Apr 21, 2026 | Feb 13, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Mar 12, 2026 | — |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Jun 2, 2025 | May 30, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 30, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 30, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 30, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 30, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 30, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 30, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | May 30, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2025 | — |
| 3/A | Ownership document | May 8, 2025 | Oct 1, 2024 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Apr 4, 2025 | — |
| 4 | Insider transaction | Apr 4, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 7, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Feb 7, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Dec 17, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Dec 13, 2024 | — |
| 4 | Insider transaction | Dec 13, 2024 | Dec 11, 2024 |
| 4 | Insider transaction | Dec 10, 2024 | 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 | 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 13G/A | Amended ownership over 5% (passive) | Nov 20, 2024 | — |
| 4 | Insider transaction | Nov 20, 2024 | Sep 25, 2024 |
| 3 | Initial insider ownership | Nov 20, 2024 | Sep 24, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 20, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| 4 | Insider transaction | Nov 14, 2024 | Oct 10, 2024 |
| 3 | Initial insider ownership | Nov 14, 2024 | Sep 26, 2024 |
| SC 13D | Ownership over 5% (active) | Oct 30, 2024 | — |
| 3 | Initial insider ownership | Oct 11, 2024 | Oct 11, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Sep 25, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Sep 25, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Sep 25, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| 3 | Initial insider ownership | Oct 2, 2024 | Oct 1, 2024 |
| 3 | Initial insider ownership | Oct 2, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Jul 1, 2024 | Jun 28, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 25, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 25, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 25, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 25, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 25, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 25, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 25, 2024 |
| 4 | Insider transaction | Mar 27, 2024 | Mar 25, 2024 |
| 4/A | Filing | Mar 11, 2024 | Feb 14, 2024 |
| 3/A | Filing | Feb 26, 2024 | Feb 14, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 22, 2024 | — |
| 4/A | Filing | Feb 21, 2024 | Feb 14, 2024 |
| 4/A | Filing | Feb 21, 2024 | Feb 14, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Feb 20, 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 |
| 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 |
| 3 | Initial insider ownership | Feb 16, 2024 | Feb 14, 2024 |
| 3 | Initial insider ownership | Feb 16, 2024 | Feb 14, 2024 |
| 3 | Initial insider ownership | Feb 16, 2024 | Feb 14, 2024 |
| 3 | Initial insider ownership | Feb 16, 2024 | Feb 14, 2024 |
| 3 | Initial insider ownership | Feb 16, 2024 | Feb 14, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 8, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2023 | — |
| SC 13D | Ownership over 5% (active) | Feb 1, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2023 | — |
| SC 13G | Ownership over 5% (passive) | May 6, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Feb 8, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 3, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Oct 22, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Oct 18, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Oct 18, 2021 | — |
| 4 | Insider transaction | Oct 12, 2021 | Oct 8, 2021 |
| 4 | Insider transaction | Oct 12, 2021 | Oct 8, 2021 |
| 4 | Insider transaction | Oct 12, 2021 | Oct 8, 2021 |
| 4 | Insider transaction | Oct 12, 2021 | Oct 8, 2021 |
| 4 | Insider transaction | Oct 12, 2021 | Oct 8, 2021 |
| 4 | Insider transaction | Oct 12, 2021 | Oct 8, 2021 |
| 4 | Insider transaction | Oct 12, 2021 | Oct 8, 2021 |
| 4 | Insider transaction | Oct 12, 2021 | Oct 8, 2021 |
| 3 | Initial insider ownership | Oct 5, 2021 | Oct 5, 2021 |
| 3 | Initial insider ownership | Oct 5, 2021 | Oct 5, 2021 |
| 3 | Initial insider ownership | Oct 5, 2021 | Oct 5, 2021 |
| 3 | Initial insider ownership | Oct 5, 2021 | Oct 5, 2021 |
| 3 | Initial insider ownership | Oct 5, 2021 | Oct 5, 2021 |
| 3 | Initial insider ownership | Oct 5, 2021 | Oct 5, 2021 |
| 3 | Initial insider ownership | Oct 5, 2021 | Oct 5, 2021 |
| 3 | Initial insider ownership | Oct 5, 2021 | Oct 5, 2021 |
Showing 125 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
- CERO (OTC), CEROW (OTC)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- South San Francisco, CA
- SEC filer status
- , Emerging growth company
- SEC CIK
- 1870404
- Former names
- CERO THERAPEUTICS HOLDINGS, INC. (until Oct 7, 2026); PHOENIX BIOTECH ACQUISITION CORP. (until Feb 14, 2024)
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All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.