Sec Form 4 Filing - Truffle Capital S.A.S. @ Altimmune, Inc. - 2018-02-13

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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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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/YY) 02/13/2018 (Street) PARIS, I075008 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 Common Stock, par value $0.0001 02/13/2018 J( 1 ) 17,789 A 174,944 I See Footnote ( 2 ) ( 3 ) Common Stock, par value $0.0001 02/13/2018 J( 1 ) 23,719 A 133,207 I See Footnote ( 2 ) ( 4 ) Common Stock, par value $0.0001 02/13/2018 J( 1 ) 17,789 A 72,217 I See Footnote ( 2 ) ( 5 ) Common Stock, par value $0.0001 02/15/2018 J( 6 ) 4,483 A 179,427 I See Footnote ( 2 ) ( 3 ) Common Stock, par value $0.0001 02/15/2018 J( 6 ) 5,977 A 139,184 I See Footnote ( 2 ) ( 4 ) Common Stock, par value $0.0001 02/15/2018 J( 6 ) 4,483 A 76,700 I See Footnote ( 2 ) ( 5 ) Common Stock, par value $0.0001 416,043 I See Footnote ( 2 ) ( 7 ) Common Stock, par value $0.0001 230,103 I See Footnote ( 2 ) ( 8 ) Common Stock, par value $0.0001 183,690 I See Footnote ( 2 ) ( 9 ) Common Stock, par value $0.0001 179,359 I See Footnote ( 2 ) ( 10 ) Common Stock, par value $0.0001 151,441 I See Footnote ( 2 ) ( 11 ) Common Stock, par value $0.0001 116,654 I See Footnote ( 2 ) ( 12 ) Common Stock, par value $0.0001 105,804 I See Footnote ( 2 ) ( 13 ) Common Stock, par value $0.0001 1,774 I See Footnote ( 2 ) ( 14 ) Common Stock, par value $0.0001 1,255 I See Footnote ( 2 ) ( 15 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 ( 16 ) 02/13/2018 J( 1 ) 22.7661 08/21/2017 08/15/2018 Common Stock, par value $0.0001 8,527 ( 1 ) 113.8297 I See Footnote ( 2 ) ( 3 ) Series B Convertible Preferred Stock $ 2.67 ( 16 ) 02/13/2018 J( 1 ) 30.3547 08/21/2017 08/15/2018 Common Stock, par value $0.0001 11,369 ( 1 ) 151.7724 I See Footnote ( 2 ) ( 4 ) Series B Convertible Preferred Stock $ 2.67 ( 16 ) 02/13/2018 J( 1 ) 22.7661 08/21/2017 08/15/2018 Common Stock, par value $0.0001 8,527 ( 1 ) 113.8297 I See Footnote ( 2 ) ( 5 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Truffle Capital S.A.S. 5, RUE DE LA BAUME PARIS, I075008 X Signatures /s/ Ori Solomon, Attorney in fact for Truffle Capital S.A.S. 02/15/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the terms of the Series B Convertible Preferred Stock (the "Preferred Stock"), the Issuer converted the Preferred Stock into shares of the Issuer's common stock, par value $0.0001 per share (the "Common Stock") at the installment conversion price of $1.2798 per share of 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 )Pursuant to the terms of the Series B Convertible Preferred Stock (the "Preferred Stock"), the Issuer converted the Preferred Stock into shares of the Issuer's common stock, par value $0.0001 per share (the "Common Stock") at the installment conversion price of $1.2408 per share of Common Stock. ( 7 )Held directly by UFF Innovation 5 (UFF5) FCPI, a FCPI. ( 8 )Held directly by UFF Innovation 17 FCPI, a FCPI. ( 9 )Held directly by Truffle Cap II (TCII) FCPR, a FCPR (Fonds Commun de Placement a Risque), which is a French venture capital fund for institutional subscribers. ( 10 )Held directly by Truffle Fortune 6 FCPI, a FCPI. ( 11 )Held directly by UFF Innovation 16 FCPI, a FCPI. ( 12 )Held directly by Truffle Fortune 5 FCPI, a FCPI. ( 13 )Held directly by Truffle InnoCroissance 2015 FCPI, a FCPI. ( 14 )Held directly by Europe Innovation 2006 (E106) FCPI, a FCPI. ( 15 )Held directly by Europe Innovation 2004 (E104) FCPI, a FCPI. ( 16 )The Issuer's Preferred Stock is convertible at any time at the option of the holder into shares of the Issuer's 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.

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).

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