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 |
| 8-K |
Current report
New debt
|
Oct 29, 2026 | Oct 27, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Oct 27, 2026 | Oct 23, 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 |
| 8-K |
Current report
Officer or director change
|
Sep 29, 2026 | Sep 24, 2026 |
| 4 | Insider transaction | Sep 17, 2026 | Sep 16, 2026 |
| 4 | Insider transaction | Aug 13, 2026 | Aug 13, 2026 |
| 10-Q | Quarterly report | Aug 12, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2026 | Aug 12, 2026 |
| 4 | Insider transaction | Aug 3, 2026 | Jul 31, 2026 |
| 4 | Insider transaction | Aug 3, 2026 | Jul 31, 2026 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jul 28, 2026 | Jul 28, 2026 |
| 8-K |
Current report
Other events
|
Jun 16, 2026 | Jun 16, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| S-8 | Employee stock plan registration | May 13, 2026 | — |
| 10-Q | Quarterly report | May 13, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 13, 2026 | May 13, 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 | — |
| 8-K |
Current report
Material agreement
|
Apr 24, 2026 | Apr 22, 2026 |
| 424B5 | Prospectus supplement | Apr 24, 2026 | — |
| S-3MEF | Filing | Apr 22, 2026 | — |
| 424B5 | Prospectus supplement | Apr 22, 2026 | — |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Apr 16, 2026 | Apr 16, 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 | — |
| ARS | Annual report to shareholders | Mar 17, 2026 | Dec 31, 2025 |
| DEF 14A | Proxy statement | Mar 17, 2026 | Apr 16, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 6, 2026 |
| PRE 14A | Preliminary proxy statement | Mar 6, 2026 | Apr 16, 2026 |
| 10-K | Annual report | Mar 6, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 5, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Feb 27, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Feb 27, 2026 | Feb 26, 2026 |
| S-8 | Employee stock plan registration | Feb 6, 2026 | — |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 8-K |
Current report
Other events
|
Feb 3, 2026 | Feb 2, 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 |
| 8-K |
Current report
Material agreement
|
Jan 28, 2026 | Jan 27, 2026 |
| 424B5 | Prospectus supplement | Jan 28, 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 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Dec 19, 2025 | Dec 19, 2025 |
| EFFECT | Filing | Dec 5, 2025 | — |
| CORRESP | Letter to the SEC | Dec 3, 2025 | — |
| 4 | Insider transaction | Dec 1, 2025 | Dec 1, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Dec 1, 2025 | Nov 30, 2025 |
| S-3/A | Filing | Nov 13, 2025 | — |
| 4 | Insider transaction | Nov 12, 2025 | Nov 11, 2025 |
| S-3 | Shelf registration | Nov 6, 2025 | — |
| 8-K |
Current report
Material agreement, Agreement ended
|
Nov 6, 2025 | Nov 6, 2025 |
| 424B5 | Prospectus supplement | Nov 6, 2025 | — |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Material agreement, Results of operations, New debt
|
Nov 6, 2025 | Nov 6, 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 |
| 8-K |
Current report
Officer or director change
|
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 |
| 8-K |
Current report
Shareholder vote results
|
Sep 25, 2025 | Sep 25, 2025 |
| 4 | Insider transaction | Sep 17, 2025 | Sep 16, 2025 |
| 3 | Initial insider ownership | Sep 17, 2025 | Sep 16, 2025 |
| UPLOAD | Letter from the SEC | Aug 19, 2025 | — |
| ARS | Annual report to shareholders | Aug 15, 2025 | Dec 31, 2024 |
| DEF 14A | Proxy statement | Aug 15, 2025 | Sep 25, 2025 |
| CORRESP | Letter to the SEC | Aug 12, 2025 | — |
| 10-Q | Quarterly report | Aug 12, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2025 | Aug 12, 2025 |
| UPLOAD | Letter from the SEC | Aug 8, 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 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 26, 2025 | Jun 26, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 10-Q | Quarterly report | May 13, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Material agreement, Results of operations, New debt, Regulation FD disclosure
|
May 13, 2025 | May 13, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 17, 2025 |
| 4 | Insider transaction | Mar 14, 2025 | Mar 13, 2025 |
| EFFECT | Filing | Mar 13, 2025 | — |
| 8-K |
Current report
Other events
|
Mar 13, 2025 | Mar 13, 2025 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 7, 2025 |
| CORRESP | Letter to the SEC | Mar 11, 2025 | — |
| UPLOAD | Letter from the SEC | Mar 5, 2025 | — |
| S-3 | Shelf registration | Feb 27, 2025 | — |
| S-8 | Employee stock plan registration | Feb 27, 2025 | — |
| 10-K | Annual report | Feb 27, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Feb 27, 2025 | Feb 24, 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 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
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 |
| 8-K |
Current report
Other events
|
Dec 11, 2024 | Nov 15, 2024 |
| 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 |
| 10-Q | Quarterly report | Nov 12, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2024 | Nov 12, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
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 |
| 8-K |
Current report
Shareholder vote results
|
Sep 26, 2024 | Sep 26, 2024 |
| 4 | Insider transaction | Aug 20, 2024 | Aug 19, 2024 |
| ARS | Annual report to shareholders | Aug 15, 2024 | Dec 31, 2023 |
| DEF 14A | Proxy statement | Aug 15, 2024 | Sep 26, 2024 |
| 8-K |
Current report
Officer or director change
|
Aug 15, 2024 | Aug 13, 2024 |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 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 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jun 26, 2024 | Jun 25, 2024 |
| 10-Q | Quarterly report | May 9, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 9, 2024 | May 9, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 10, 2024 | — |
| S-8 | Employee stock plan registration | Mar 27, 2024 | — |
| 10-K | Annual report | Mar 27, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations, Other events
|
Mar 27, 2024 | Mar 27, 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 |
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.