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 |
|---|---|---|---|
| 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 |
| 8-K |
Current report
Officer or director change
|
Sep 29, 2026 | Sep 24, 2026 |
| 10-Q | Quarterly report | Aug 12, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2026 | Aug 12, 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 |
| 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 |
| 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 |
| ARS | Annual report to shareholders | Mar 17, 2026 | Dec 31, 2025 |
| DEF 14A | Proxy statement | Mar 17, 2026 | Apr 16, 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 |
| S-8 | Employee stock plan registration | Feb 6, 2026 | — |
| 8-K |
Current report
Other events
|
Feb 3, 2026 | Feb 2, 2026 |
| 8-K |
Current report
Material agreement
|
Jan 28, 2026 | Jan 27, 2026 |
| 424B5 | Prospectus supplement | Jan 28, 2026 | — |
| 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 | — |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Dec 1, 2025 | Nov 30, 2025 |
| S-3/A | Filing | Nov 13, 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 |
| 8-K |
Current report
Officer or director change
|
Oct 3, 2025 | Oct 1, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Sep 25, 2025 | Sep 25, 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 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 26, 2025 | Jun 26, 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 |
| EFFECT | Filing | Mar 13, 2025 | — |
| 8-K |
Current report
Other events
|
Mar 13, 2025 | Mar 13, 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 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Feb 25, 2025 | Feb 24, 2025 |
| 8-K |
Current report
Other events
|
Dec 11, 2024 | Nov 15, 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 |
| 8-K |
Current report
Shareholder vote results
|
Sep 26, 2024 | Sep 26, 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 |
| 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 |
| 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 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Nov 30, 2023 | Nov 30, 2023 |
| 10-Q | Quarterly report | Nov 7, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2023 | Nov 7, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Sep 28, 2023 | Sep 28, 2023 |
| ARS | Annual report to shareholders | Aug 16, 2023 | Dec 31, 2022 |
| DEF 14A | Proxy statement | Aug 16, 2023 | Sep 28, 2023 |
| 10-Q | Quarterly report | Aug 10, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2023 | Aug 10, 2023 |
| 10-Q | Quarterly report | May 11, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 11, 2023 | May 11, 2023 |
| 8-K |
Current report
Officer or director change
|
Mar 27, 2023 | Mar 23, 2023 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Mar 21, 2023 | Mar 21, 2023 |
| S-3ASR | Automatic shelf registration | Feb 28, 2023 | — |
| S-8 | Employee stock plan registration | Feb 28, 2023 | — |
| 10-K | Annual report | Feb 28, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 28, 2023 | Feb 28, 2023 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Dec 20, 2022 | Dec 20, 2022 |
| CT ORDER | Filing | Nov 29, 2022 | — |
| 10-Q | Quarterly report | Nov 10, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2022 | Nov 10, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Sep 29, 2022 | Sep 29, 2022 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Sep 14, 2022 | Sep 14, 2022 |
| DEF 14A | Proxy statement | Aug 16, 2022 | Sep 29, 2022 |
| 10-Q | Quarterly report | Aug 11, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2022 | Aug 11, 2022 |
| 10-Q | Quarterly report | May 12, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 12, 2022 | May 12, 2022 |
| S-8 | Employee stock plan registration | Mar 15, 2022 | — |
| 10-K | Annual report | Mar 15, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Mar 15, 2022 | Mar 15, 2022 |
| 8-K |
Current report
Agreement ended
|
Dec 17, 2021 | Dec 17, 2021 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Dec 13, 2021 | Dec 9, 2021 |
| 10-Q | Quarterly report | Nov 9, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2021 | Nov 9, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Sep 28, 2021 | Sep 28, 2021 |
| 8-K |
Current report
Shareholder vote results
|
Sep 24, 2021 | Sep 23, 2021 |
| DEF 14A | Proxy statement | Aug 16, 2021 | Sep 23, 2021 |
| 10-Q | Quarterly report | Aug 10, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2021 | Aug 10, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 29, 2021 | Jun 29, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 16, 2021 | Jun 16, 2021 |
| 10-Q | Quarterly report | May 17, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
May 17, 2021 | May 17, 2021 |
| 8-K |
Current report
Other events
|
Apr 1, 2021 | Apr 1, 2021 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Mar 12, 2021 | Mar 9, 2021 |
| 8-K |
Current report
Material agreement
|
Feb 25, 2021 | Feb 25, 2021 |
| 424B5 | Prospectus supplement | Feb 25, 2021 | — |
| 10-K | Annual report | Feb 25, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Material agreement, Results of operations, Unregistered share sale, Other events
|
Feb 25, 2021 | Feb 25, 2021 |
| EFFECT | Filing | Jan 11, 2021 | — |
| CORRESP | Letter to the SEC | Jan 7, 2021 | — |
| UPLOAD | Letter from the SEC | Jan 7, 2021 | — |
| S-3 | Shelf registration | Dec 31, 2020 | — |
| 8-K |
Current report
Other events
|
Dec 23, 2020 | Dec 23, 2020 |
| 10-Q | Quarterly report | Nov 9, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2020 | Nov 9, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Sep 25, 2020 | Sep 24, 2020 |
| S-8 | Employee stock plan registration | Aug 21, 2020 | — |
| DEF 14A | Proxy statement | Aug 21, 2020 | Sep 24, 2020 |
| 10-Q | Quarterly report | Aug 11, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2020 | Aug 11, 2020 |
| 8-K/A |
Amended current report
Officer or director change
|
Jul 16, 2020 | May 11, 2020 |
| 8-K |
Current report
Material agreement, Results of operations, Other events
|
Jul 16, 2020 | Jul 13, 2020 |
| 424B5 | Prospectus supplement | Jul 15, 2020 | — |
| 424B5 | Prospectus supplement | Jul 13, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jul 13, 2020 | Jul 13, 2020 |
| 424B5 | Prospectus supplement | Jun 1, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 1, 2020 | Jun 1, 2020 |
| 8-K |
Current report
Results of operations
|
May 13, 2020 | May 13, 2020 |
| 10-Q | Quarterly report | May 13, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Officer or director change
|
May 12, 2020 | May 11, 2020 |
| 8-K |
Current report
Material agreement
|
Apr 8, 2020 | Apr 2, 2020 |
| 8-K |
Current report
Material agreement
|
Mar 27, 2020 | Mar 27, 2020 |
| 424B5 | Prospectus supplement | Mar 27, 2020 | — |
| 10-K | Annual report | Mar 27, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations
|
Mar 27, 2020 | Mar 27, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2019 | Nov 13, 2019 |
| 10-Q | Quarterly report | Nov 13, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Oct 1, 2019 | Sep 26, 2019 |
| UPLOAD | Letter from the SEC | Aug 22, 2019 | — |
| DEF 14A | Proxy statement | Aug 22, 2019 | Sep 26, 2019 |
| 8-K |
Current report
Material agreement
|
Aug 21, 2019 | Aug 20, 2019 |
| PRER14A | Filing | Aug 19, 2019 | — |
| CORRESP | Letter to the SEC | Aug 19, 2019 | — |
| UPLOAD | Letter from the SEC | Aug 16, 2019 | — |
| S-8 | Employee stock plan registration | Aug 14, 2019 | — |
| 8-K |
Current report
Results of operations
|
Aug 13, 2019 | Aug 13, 2019 |
| 10-Q | Quarterly report | Aug 13, 2019 | Jun 30, 2019 |
| PRE 14A | Preliminary proxy statement | Aug 9, 2019 | Sep 26, 2019 |
| 8-K |
Current report
Acquisition or sale of assets, Unregistered share sale, Regulation FD disclosure
|
Jul 15, 2019 | Jul 12, 2019 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure
|
Jul 9, 2019 | Jul 8, 2019 |
| 8-K |
Current report
Officer or director change
|
Jun 21, 2019 | Jun 17, 2019 |
| 8-K |
Current report
Officer or director change
|
Jun 12, 2019 | Jun 10, 2019 |
| 8-K |
Current report
Officer or director change
|
Jun 7, 2019 | Jun 3, 2019 |
| 8-K |
Current report
Results of operations
|
May 14, 2019 | May 14, 2019 |
| 10-Q | Quarterly report | May 14, 2019 | Mar 31, 2019 |
| UPLOAD | Letter from the SEC | Apr 15, 2019 | — |
| EFFECT | Filing | Apr 12, 2019 | — |
| CORRESP | Letter to the SEC | Apr 11, 2019 | — |
| CORRESP | Letter to the SEC | Apr 11, 2019 | — |
| S-3 | Shelf registration | Apr 4, 2019 | — |
| S-8 | Employee stock plan registration | Apr 4, 2019 | — |
| 8-K |
Current report
Results of operations
|
Apr 1, 2019 | Apr 1, 2019 |
| 10-K | Annual report | Apr 1, 2019 | Dec 31, 2018 |
| 8-K |
Current report
Officer or director change
|
Mar 15, 2019 | Mar 14, 2019 |
| 424B2 | Prospectus | Mar 11, 2019 | — |
| 8-K |
Current report
Material agreement, Other events
|
Mar 11, 2019 | Mar 8, 2019 |
| 8-K |
Current report
Results of operations, Other events
|
Mar 8, 2019 | Mar 8, 2019 |
| 8-K |
Current report
Officer or director change, Other events
|
Dec 3, 2018 | Nov 28, 2018 |
| S-8 | Employee stock plan registration | Nov 30, 2018 | — |
| 8-K |
Current report
Other events
|
Nov 30, 2018 | Nov 30, 2018 |
| 8-K |
Current report
Officer or director change
|
Nov 27, 2018 | Nov 27, 2018 |
| 10-Q | Quarterly report | Nov 13, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2018 | Nov 13, 2018 |
| 8-K |
Current report
Officer or director change
|
Oct 22, 2018 | Oct 16, 2018 |
| 424B5 | Prospectus supplement | Oct 9, 2018 | — |
| 424B5 | Prospectus supplement | Oct 9, 2018 | — |
| 8-K |
Current report
Material agreement, Other events
|
Oct 9, 2018 | Oct 8, 2018 |
| CT ORDER | Filing | Oct 4, 2018 | — |
| 8-K |
Current report
Other events
|
Oct 1, 2018 | Sep 28, 2018 |
| 424B4 | Prospectus | Oct 1, 2018 | — |
| POS EX | Filing | Sep 28, 2018 | — |
| EFFECT | Filing | Sep 27, 2018 | — |
| CORRESP | Letter to the SEC | Sep 27, 2018 | — |
| CORRESP | Letter to the SEC | Sep 27, 2018 | — |
| S-1/A | Amended registration statement | Sep 26, 2018 | — |
| 8-K |
Current report
Material agreement, Other events
|
Sep 25, 2018 | Sep 24, 2018 |
| 424B5 | Prospectus supplement | Sep 24, 2018 | — |
| 8-K |
Current report
Material agreement, Other events
|
Sep 24, 2018 | Sep 24, 2018 |
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)
Other Pharmaceutical Preparations companies
- ELI LILLY & Co LLY
- Johnson & Johnson JNJ
- AbbVie Inc. ABBV
- Merck & Co., Inc. MRK
- Novartis AG NVS
- Astrazeneca PLC AZN
- Abbott Laboratories ABT
- Novo Nordisk A S NVO
Source: SEC EDGAR filings. This is company-reported data, not investment advice.