FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Truffle Capital S.A.S. 		2. Issuer Name and Ticker or Trading Symbol

Altimmune, Inc. [ ALT ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

5, RUE DE LA BAUME 		3. Date of Earliest Transaction (MM/DD/YYYY)

8/21/2017
(Street)

PARIS, I0 75008
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series B Convertible Preferred Stock   $2.67   (1) 8/21/2017     P      204.894       8/21/2017   8/15/2018   Common Stock, par value $0.0001   76740   $940.00   204.894   I   See Footnote   (2) (3)
Series B Convertible Preferred Stock   $2.67   (1) 8/21/2017     P      273.191       8/21/2017   8/15/2018   Common Stock, par value $0.0001   102318   $940.00   273.191   I   See Footnote   (2) (4)
Series B Convertible Preferred Stock   $2.67   (1) 8/21/2017     P      204.894       8/21/2017   8/15/2018   Common Stock, par value $0.0001   76740   $940.00   204.894   I   See Footnote   (2) (5)
Warrant   $2.67   8/21/2017     P      30696       8/21/2017   8/15/2022   Common Stock, par value $0.0001   30696     (6) 30696   I   See Footnote   (2) (3)
Warrant   $2.67   8/21/2017     P      40927       8/21/2017   8/15/2022   Common Stock, par value $0.0001   40927     (6) 40927   I   See Footnote   (2) (4)
Warrant   $2.67   8/21/2017     P      30696       8/21/2017   8/15/2022   Common Stock, par value $0.0001   30696     (6) 30696   I   See Footnote   (2) (5)

Explanation of Responses:
(1)  The Issuer's Series B Convertible Preferred Stock (the "Preferred Stock") is convertible at any time at the option of the holder into shares of the Issuer's common stock, par value $0.0001 per share (the "Common Stock"), subject to certain restrictions, at an initial conversion price of $2.67 per share and a stated amount of $1,000 per share. Prior to the receipt of approval by the Issuer's stockholders for the issuance of shares pursuant to the conversion of the Preferred Stock (the "Requisite Stockholder Approval"), the Preferred Stock may not be converted by the holder if, as a result of such conversion, the holder, together with its affiliates, would hold more than 19.99% of the Issuer's Common Stock.
(2)  Truffle Capital S.A.S., a French societe par actions simplifiee, is the fund manager for each of the funds listed in the following footnotes and as such manages and controls all voting and dispositive rights to shares held by each such fund. Philippe Pouletty, Bernard-Louis Roques and Henri Moulard may be deemed to possess voting and dispositive control over the shares held by funds managed by Truffle Capital S.A.S. and may be deemed to have indirect beneficial ownership of such shares. Each of these individuals disclaims beneficial ownership of such shares, except with respect to any pecuniary interest therein.
(3)  Held directly by UFF Innovation 14 FCPI, a FCPI (Fonds Commun de Placement dans l'Innovation), which is a tax efficient French collective investment fund.
(4)  Held directly by UFF Innovation 15 FCPI, a FCPI.
(5)  Held directly by Truffle Fortune 4 FCPI, a FCPI.
(6)  Warrants to purchase shares of the Issuer's Common Stock were acquired in connection with the acquisition of the Preferred Stock and reported on this Form 4. The Warrants may not be exercised if such exercise would cause the holder, together with its affiliates, to hold more than 19.99% of the Issuer's Common Stock, prior to the receipt by the Issuer of the Requisite Stockholder Approval.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Truffle Capital S.A.S.
5, RUE DE LA BAUME
PARIS, I0 75008
X


Signatures
/s/ Ori Solomon, Attorney in fact for Truffle Capital S.A.S. 8/23/2017
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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