<SEC-DOCUMENT>0001326190-25-000066-index.html : 20251106
<SEC-HEADER>0001326190-25-000066.hdr.sgml : 20251106
<ACCEPTANCE-DATETIME>20251106162538
ACCESSION NUMBER:		0001326190-25-000066
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		6
FILED AS OF DATE:		20251106
DATE AS OF CHANGE:		20251106

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Altimmune, Inc.
		CENTRAL INDEX KEY:			0001326190
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				202726770
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-285355
		FILM NUMBER:		251458791

	BUSINESS ADDRESS:	
		STREET 1:		910 CLOPPER ROAD
		STREET 2:		SUITE 201S
		CITY:			GAITHERSBURG
		STATE:			MD
		ZIP:			20878
		BUSINESS PHONE:		2406541450

	MAIL ADDRESS:	
		STREET 1:		910 CLOPPER ROAD
		STREET 2:		SUITE 201S
		CITY:			GAITHERSBURG
		STATE:			MD
		ZIP:			20878

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PHARMATHENE, INC
		DATE OF NAME CHANGE:	20071016

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HEALTHCARE ACQUISITION CORP
		DATE OF NAME CHANGE:	20050505
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B5
<SEQUENCE>1
<FILENAME>alt-20251106x424b5.htm
<DESCRIPTION>424B5
<TEXT>
Document 1 - file: alt-20251106x424b5.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>alt-20251106x424b5001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: alt-20251106x424b5001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>alt-20251106x424b5005.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: alt-20251106x424b5005.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>alt-20251106x424b5007.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: alt-20251106x424b5007.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>alt-20251106x424b5008.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: alt-20251106x424b5008.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>alt-20251106x424b5009.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: alt-20251106x424b5009.jpg

</DOCUMENT>
</SEC-DOCUMENT>