Altimmune, Inc.

ALT·NASDAQ·$2.93Share Price as of 11/2·$259MMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/12/26 10-QQ1 ended 03/31/2605/13/26 10-KFY 202503/06/26 10-QQ3 ended 09/30/2511/06/25 10-QQ2 ended 06/30/2508/12/25

Disclosures

8-KCurrent report10/29/26 8-KCurrent report10/27/26 8-KCurrent report09/29/26 8-KCurrent report08/12/26 8-KCurrent report07/28/26

Prospectuses and Registrations

S-8Registration of securities for employees05/13/26 424B5Prospectus supplement04/24/26 424B5Prospectus supplement04/22/26 S-3MEFProspectus / registration04/22/26 S-8Registration of securities for employees02/06/26

Proxies

DEF 14ADefinitive proxy03/17/26 PRE 14APreliminary proxy03/06/26 DEF 14ADefinitive proxy08/15/25 DEF 14ADefinitive proxy08/15/24 DEF 14ADefinitive proxy08/16/23

Ownership

Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 3Initial insider ownership10/02/26 Form 4Insider transaction10/02/26 Form 4Insider transaction09/17/26

Other

ARSAnnual report to shareholders03/17/26 EFFECTRequest for effectiveness12/05/25 CORRESPCorrespondence with the SEC12/03/25 UPLOADLetter from the SEC08/19/25 ARSAnnual report to shareholders08/15/25