Zenas BioPharma, Inc. SEC filings ZBIO
Zenas BioPharma, Inc. has 193 filings in SEC EDGAR's recent list, going back to Nov 15, 2022. Its latest annual report, Form ARS, was filed on Mar 16, 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/A | Amended ownership over 5% (passive) | Nov 5, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 27, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 8, 2026 | — |
| 3 | Initial insider ownership | Sep 8, 2026 | Aug 26, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Sep 8, 2026 | — |
| 4 | Insider transaction | Sep 2, 2026 | Sep 1, 2026 |
| 3 | Initial insider ownership | Sep 2, 2026 | Sep 1, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Aug 19, 2026 | — |
| 144 | Notice of proposed sale | Aug 19, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Aug 17, 2026 | — |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | May 18, 2026 | May 18, 2026 |
| SCHEDULE 13D | Ownership over 5% (active) | May 5, 2026 | — |
| 4 | Insider transaction | Apr 29, 2026 | Apr 28, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Apr 2, 2026 | — |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Mar 31, 2026 | Mar 30, 2026 |
| 4 | Insider transaction | Mar 31, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Feb 13, 2026 | Feb 11, 2026 |
| 4 | Insider transaction | Feb 13, 2026 | Feb 12, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2026 | — |
| 4 | Insider transaction | Feb 3, 2026 | Feb 2, 2026 |
| SCHEDULE 13D | Ownership over 5% (active) | Jan 14, 2026 | — |
| 4 | Insider transaction | Jan 9, 2026 | Jan 7, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| 3 | Initial insider ownership | Oct 15, 2025 | Oct 7, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 15, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 14, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 14, 2025 | — |
| 4 | Insider transaction | Oct 14, 2025 | Oct 9, 2025 |
| 4 | Insider transaction | Oct 14, 2025 | Oct 9, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 14, 2025 | — |
| 4 | Insider transaction | Oct 14, 2025 | Oct 9, 2025 |
| 4 | Insider transaction | Oct 9, 2025 | Oct 7, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 9, 2025 | — |
| 4 | Insider transaction | Oct 9, 2025 | Oct 7, 2025 |
| 4 | Insider transaction | Oct 9, 2025 | Sep 13, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Sep 8, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 6, 2025 | — |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| SCHEDULE 13D | Ownership over 5% (active) | Jun 6, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 12, 2025 | — |
| 4/A | Ownership document | Apr 28, 2025 | Feb 7, 2025 |
| 4 | Insider transaction | Apr 17, 2025 | Apr 15, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 1, 2025 | — |
| 3 | Initial insider ownership | Mar 21, 2025 | Mar 17, 2025 |
| 4 | Insider transaction | Feb 19, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 11, 2025 | Feb 7, 2025 |
| 4 | Insider transaction | Dec 18, 2024 | Dec 16, 2024 |
| 4 | Insider transaction | Dec 18, 2024 | Dec 16, 2024 |
| 4 | Insider transaction | Dec 4, 2024 | Dec 3, 2024 |
| 4 | Insider transaction | Nov 20, 2024 | Nov 18, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Oct 21, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Sep 25, 2024 | — |
| SC 13D | Ownership over 5% (active) | Sep 23, 2024 | — |
| SC 13D | Ownership over 5% (active) | Sep 23, 2024 | — |
| SC 13D | Ownership over 5% (active) | Sep 23, 2024 | — |
| 4 | Insider transaction | Sep 20, 2024 | Sep 18, 2024 |
| 4 | Insider transaction | Sep 18, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 18, 2024 | Sep 16, 2024 |
| 4/A | Ownership document | Sep 17, 2024 | Sep 12, 2024 |
| 4/A | Ownership document | Sep 17, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 17, 2024 | Sep 13, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 16, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
| 3 | Initial insider ownership | Sep 12, 2024 | Sep 12, 2024 |
Showing 112 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
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- ZBIO (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Waltham, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company, Emerging growth company
- SEC CIK
- 1953926
- Former names
- Zenas BioPharma (Cayman) Ltd (until Nov 15, 2022)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.