Altimmune, Inc. 10-Q

Item 5. Other Information During the three months ended March 31, 2024, none of our officers or directors adopted , modified or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement" as defined in Item 408(c) of Regulation S-K. ​ 18 Table of Contents Item 6. Exhibits ​ ​ ​ ​ ​ Exhibit Index ​ ​ ​ Exhibit No. Description ​ ​ ​ 3.1 Amended and Restated Certificate of Incorporation, dated October 17, 2017 (incorporated by reference to Exhibit 3.1 to the Registrant’s Form 8-K filed on October 18, 2017) ​ ​ ​ 3.2 Certificate of Amendment to Amended and Restated Certificate of Incorporation regarding a reverse stock split (incorporated by reference to Exhibit 3.1 to the Registrant’s Form 8-K filed on September 13, 2018) ​ ​ ​ 3.3 Certificate of Amendment to Amended and Restated Certificate of Incorporation regarding an increase in authorized shares (incorporated by reference to Exhibit 3.2 to the Registrant’s Form 8-K filed on September 13, 2018) ​ ​ ​ 3.4 Amended and Restated Bylaws of Altimmune, Inc. (incorporated by reference to Exhibit 3.2 to the Registrant’s Form 8-K filed on October 18, 2017) ​ ​ ​ 31.1 † Certification of Principal Executive Officer Pursuant to SEC Rule 13a-14(a)/15d-14(a) ​ ​ 31.2 † Certification of Principal Financial Officer Pursuant to SEC Rule 13a-14(a)/15d-14(a) ​ ​ 32.1 † Certification Pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code ​ ​ 32.2 † Certification Pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code ​ ​ 101.INS Inline XBRL Instance Document (the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document) ​ ​ 101.SCH Inline XBRL Taxonomy Extension Schema Document ​ ​ 101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document ​ ​ 101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document ​ ​ 101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document ​ ​ 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document ​ ​ ​ 104 ​ Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) ​ † This certification will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent specifically incorporated by reference into such filing. § Certain portions of this exhibit have been omitted pursuant to a request for confidential treatment. ​ 19 Table of Contents SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused the report to be signed on its behalf by the undersigned, thereunto duly authorized. ​ ​ ​ ​ ALTIMMUNE, INC. ​ ​ ​ Dated: May 9, 2024 By: /s/ Vipin K. Garg ​ Name: Vipin K. Garg ​ Title: President and Chief Executive Officer (Principal Executive Officer) ​ ​ ​ Dated: May 9, 2024 By: /s/ Richard Eisenstadt ​ Name: Richard Eisenstadt ​ Title: Chief Financial Officer (Principal Financial and Accounting Officer) ​ ​ ​ ​ ​ 20