Altimmune, Inc. SEC filings ALT
Altimmune, Inc. has 1,005 filings in SEC EDGAR's recent list, going back to Jan 31, 2011. Its latest annual report, Form ARS, was filed on Mar 17, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 12, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 29, 2026 (new debt). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Nov 4, 2026 | Nov 2, 2026 |
| 3 | Initial insider ownership | Nov 4, 2026 | Nov 2, 2026 |
| 4 | Insider transaction | Nov 4, 2026 | Nov 2, 2026 |
| 3 | Initial insider ownership | Nov 4, 2026 | Nov 2, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Oct 1, 2026 |
| 3 | Initial insider ownership | Oct 2, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Sep 17, 2026 | Sep 16, 2026 |
| 4 | Insider transaction | Aug 13, 2026 | Aug 13, 2026 |
| 4 | Insider transaction | Aug 3, 2026 | Jul 31, 2026 |
| 4 | Insider transaction | Aug 3, 2026 | Jul 31, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 12, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 1, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 1, 2026 | — |
| 4 | Insider transaction | May 1, 2026 | May 1, 2026 |
| 4 | Insider transaction | May 1, 2026 | May 1, 2026 |
| 4 | Insider transaction | May 1, 2026 | May 1, 2026 |
| 4 | Insider transaction | May 1, 2026 | May 1, 2026 |
| 4 | Insider transaction | May 1, 2026 | May 1, 2026 |
| 4 | Insider transaction | May 1, 2026 | May 1, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 1, 2026 | — |
| 4 | Insider transaction | May 1, 2026 | May 1, 2026 |
| 4 | Insider transaction | May 1, 2026 | May 1, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 2026 | — |
| 4 | Insider transaction | Apr 6, 2026 | Apr 6, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 9, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Feb 27, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Feb 27, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 2, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 2, 2026 | Jan 31, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 30, 2026 | — |
| 4 | Insider transaction | Jan 29, 2026 | Jan 27, 2026 |
| 4 | Insider transaction | Jan 29, 2026 | Jan 27, 2026 |
| 4 | Insider transaction | Jan 29, 2026 | Jan 27, 2026 |
| 4 | Insider transaction | Jan 27, 2026 | Jan 25, 2026 |
| 4 | Insider transaction | Jan 27, 2026 | Jan 25, 2026 |
| 4 | Insider transaction | Jan 27, 2026 | Jan 25, 2026 |
| 4 | Insider transaction | Jan 9, 2026 | Jan 8, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 5, 2026 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 29, 2025 |
| 4 | Insider transaction | Dec 23, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 22, 2025 |
| 4 | Insider transaction | Dec 1, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Nov 12, 2025 | Nov 11, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 3 | Initial insider ownership | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 29, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 17, 2025 | Sep 16, 2025 |
| 3 | Initial insider ownership | Sep 17, 2025 | Sep 16, 2025 |
| 4 | Insider transaction | Aug 4, 2025 | Jul 31, 2025 |
| 4 | Insider transaction | Aug 4, 2025 | Jul 31, 2025 |
| 4 | Insider transaction | Aug 4, 2025 | Jul 31, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 16, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 4 | Insider transaction | Mar 18, 2025 | Mar 17, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Mar 13, 2025 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 24, 2025 |
| 3 | Initial insider ownership | Feb 26, 2025 | Feb 24, 2025 |
| 4 | Insider transaction | Feb 25, 2025 | Feb 24, 2025 |
| 3 | Initial insider ownership | Feb 25, 2025 | Feb 24, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| 4 | Insider transaction | Feb 7, 2025 | Feb 6, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2025 | — |
| 4 | Insider transaction | Feb 3, 2025 | Jan 30, 2025 |
| 4 | Insider transaction | Feb 3, 2025 | Jan 30, 2025 |
| 4 | Insider transaction | Feb 3, 2025 | Jan 31, 2025 |
| 4 | Insider transaction | Feb 3, 2025 | Jan 30, 2025 |
| 4 | Insider transaction | Jan 28, 2025 | Jan 25, 2025 |
| 4 | Insider transaction | Jan 28, 2025 | Jan 25, 2025 |
| 4 | Insider transaction | Jan 28, 2025 | Jan 25, 2025 |
| 4 | Insider transaction | Jan 28, 2025 | Jan 25, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 1, 2025 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| 4 | Insider transaction | Nov 12, 2024 | Nov 11, 2024 |
| 3 | Initial insider ownership | Nov 12, 2024 | Nov 11, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 17, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 16, 2024 | — |
| 4 | Insider transaction | Sep 30, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Sep 30, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Sep 30, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Sep 30, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Sep 30, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Sep 30, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Sep 30, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Aug 20, 2024 | Aug 19, 2024 |
| 4 | Insider transaction | Aug 1, 2024 | Jul 31, 2024 |
| 4 | Insider transaction | Aug 1, 2024 | Jul 31, 2024 |
| 4 | Insider transaction | Aug 1, 2024 | Jul 31, 2024 |
| 4 | Insider transaction | Aug 1, 2024 | Jul 31, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 10, 2024 | — |
| 3 | Initial insider ownership | Jul 1, 2024 | Jun 26, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 10, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Mar 5, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2024 | — |
| 4 | Insider transaction | Feb 5, 2024 | Feb 1, 2024 |
| 4 | Insider transaction | Feb 5, 2024 | Feb 1, 2024 |
| 4 | Insider transaction | Feb 5, 2024 | Feb 1, 2024 |
| 4 | Insider transaction | Feb 1, 2024 | Jan 30, 2024 |
| 4 | Insider transaction | Feb 1, 2024 | Jan 31, 2024 |
| 4 | Insider transaction | Feb 1, 2024 | Jan 30, 2024 |
| 4 | Insider transaction | Feb 1, 2024 | Jan 30, 2024 |
| 4 | Insider transaction | Feb 1, 2024 | Jan 30, 2024 |
| 4 | Insider transaction | Jan 29, 2024 | Jan 25, 2024 |
| 4 | Insider transaction | Jan 29, 2024 | Jan 25, 2024 |
| 4 | Insider transaction | Jan 29, 2024 | Jan 25, 2024 |
| 4 | Insider transaction | Jan 29, 2024 | Jan 25, 2024 |
| 4 | Insider transaction | Jan 29, 2024 | Jan 25, 2024 |
| SC 13G | Ownership over 5% (passive) | Jan 26, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 23, 2024 | — |
| 4 | Insider transaction | Jan 4, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Jan 2, 2024 | Dec 29, 2023 |
| 4 | Insider transaction | Sep 29, 2023 | Sep 28, 2023 |
| 4 | Insider transaction | Sep 29, 2023 | Sep 28, 2023 |
| 4 | Insider transaction | Sep 29, 2023 | Sep 28, 2023 |
| 4 | Insider transaction | Sep 29, 2023 | Sep 28, 2023 |
| 4 | Insider transaction | Sep 29, 2023 | Sep 28, 2023 |
| 4 | Insider transaction | Sep 29, 2023 | Sep 28, 2023 |
| 4 | Insider transaction | Sep 29, 2023 | Sep 28, 2023 |
| 4 | Insider transaction | Sep 29, 2023 | Sep 28, 2023 |
| 4 | Insider transaction | Aug 15, 2023 | Aug 15, 2023 |
| 4 | Insider transaction | Aug 2, 2023 | Jul 31, 2023 |
| 4 | Insider transaction | Aug 2, 2023 | Jul 31, 2023 |
| 4 | Insider transaction | Aug 2, 2023 | Jul 31, 2023 |
| 4 | Insider transaction | Aug 2, 2023 | Jul 31, 2023 |
| 4 | Insider transaction | Aug 2, 2023 | Jul 31, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 10, 2023 | — |
| 4 | Insider transaction | Jul 6, 2023 | Aug 12, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 12, 2023 | — |
| 4 | Insider transaction | Mar 27, 2023 | Mar 23, 2023 |
| 4 | Insider transaction | Mar 27, 2023 | Mar 23, 2023 |
| 3 | Initial insider ownership | Mar 27, 2023 | Mar 23, 2023 |
| 4 | Insider transaction | Mar 24, 2023 | Mar 24, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 23, 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/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 13, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Feb 9, 2023 | — |
| 4 | Insider transaction | Feb 6, 2023 | Feb 2, 2023 |
| 4 | Insider transaction | Feb 6, 2023 | Feb 2, 2023 |
| 4 | Insider transaction | Feb 6, 2023 | Feb 2, 2023 |
| 4 | Insider transaction | Feb 2, 2023 | Jan 31, 2023 |
| 4 | Insider transaction | Feb 2, 2023 | Jan 31, 2023 |
| 4 | Insider transaction | Feb 2, 2023 | Jan 31, 2023 |
| 4 | Insider transaction | Feb 2, 2023 | Jan 31, 2023 |
| 4 | Insider transaction | Feb 1, 2023 | Jan 30, 2023 |
| 4 | Insider transaction | Feb 1, 2023 | Jan 30, 2023 |
| 4 | Insider transaction | Feb 1, 2023 | Jan 30, 2023 |
| 4 | Insider transaction | Feb 1, 2023 | Jan 30, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 10, 2023 | — |
| 4 | Insider transaction | Jan 4, 2023 | Jan 3, 2023 |
| 3 | Initial insider ownership | Jan 4, 2023 | Jan 3, 2023 |
| 4 | Insider transaction | Jan 3, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Dec 22, 2022 | Dec 22, 2022 |
| 4 | Insider transaction | Dec 1, 2022 | Nov 30, 2022 |
| 4 | Insider transaction | Nov 21, 2022 | Nov 18, 2022 |
| 4 | Insider transaction | Oct 31, 2022 | Oct 30, 2022 |
| 4 | Insider transaction | Oct 3, 2022 | Sep 30, 2022 |
| 4 | Insider transaction | Sep 30, 2022 | Sep 29, 2022 |
| 4 | Insider transaction | Sep 30, 2022 | Sep 29, 2022 |
| 4 | Insider transaction | Sep 30, 2022 | Sep 29, 2022 |
| 4 | Insider transaction | Sep 30, 2022 | Sep 29, 2022 |
| 4 | Insider transaction | Sep 30, 2022 | Sep 29, 2022 |
| 4 | Insider transaction | Sep 30, 2022 | Sep 29, 2022 |
| 4 | Insider transaction | Sep 30, 2022 | Sep 29, 2022 |
| 4 | Insider transaction | Sep 1, 2022 | Aug 30, 2022 |
| 4 | Insider transaction | Aug 12, 2022 | Aug 12, 2022 |
| 4 | Insider transaction | Aug 3, 2022 | Jul 31, 2022 |
| 4 | Insider transaction | Aug 3, 2022 | Jul 31, 2022 |
| 4 | Insider transaction | Aug 3, 2022 | Jul 31, 2022 |
| 4 | Insider transaction | Aug 1, 2022 | Jul 30, 2022 |
| SC 13G | Ownership over 5% (passive) | Jul 8, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Jul 7, 2022 | — |
| 4 | Insider transaction | Jul 5, 2022 | Jul 1, 2022 |
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
- ALT (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Morristown, NJ
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1326190
- Former names
- PHARMATHENE, INC (until May 3, 2017); HEALTHCARE ACQUISITION CORP (until Oct 15, 2007)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.