<SEC-DOCUMENT>0001104659-21-024075-index.html : 20210216
<SEC-HEADER>0001104659-21-024075.hdr.sgml : 20210216
<ACCEPTANCE-DATETIME>20210216162237
ACCESSION NUMBER:		0001104659-21-024075
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20210216
DATE AS OF CHANGE:		20210216
GROUP MEMBERS:		BAKER BROS. ADVISORS (GP) LLC
GROUP MEMBERS:		FELIX J. BAKER
GROUP MEMBERS:		JULIAN C. BAKER

SUBJECT COMPANY:	

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

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-80900
		FILM NUMBER:		21638939

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BAKER BROS. ADVISORS LP
		CENTRAL INDEX KEY:			0001263508
		IRS NUMBER:				134093645
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		860 WASHINGTON STREET
		STREET 2:		3RD FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10014
		BUSINESS PHONE:		2123395600

	MAIL ADDRESS:	
		STREET 1:		860 WASHINGTON STREET
		STREET 2:		3RD FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10014

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BAKER BROS ADVISORS LLC
		DATE OF NAME CHANGE:	20030911
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>tm214392d3_sc13g.htm
<DESCRIPTION>SCHEDULE 13G
<TEXT>
Document 1 - file: tm214392d3_sc13g.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>tm214392d3_ex99-1.htm
<DESCRIPTION>EXHIBIT 99.1
<TEXT>
Document 2 - file: tm214392d3_ex99-1.htm

</DOCUMENT>
</SEC-DOCUMENT>