Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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(Print or Type Responses)
1. Name and Address of Reporting Person *
  ARCH VENTURE FUND VI LP
2. Date of Event Requiring Statement (Month/Day/Year)
02/13/2015
3. Issuer Name and Ticker or Trading Symbol
Bellerophon Therapeutics, Inc. [BLPH]
(Last)
(First)
(Middle)
8725 WEST HIGGINS ROAD, SUITE 290
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CHICAGO, IL 60631
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 752,994
D (1) (2)
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
ARCH VENTURE FUND VI LP
8725 WEST HIGGINS ROAD, SUITE 290
CHICAGO, IL 60631
    X    
ARCH VENTURE PARTNERS VI LP
8725 WEST HIGGINS ROAD, SUITE 290
CHICAGO, IL 60631
    X    
ARCH VENTURE PARTNERS VI LLC
8725 WEST HIGGINS ROAD, SUITE 290
CHICAGO, IL 60631
    X    
CRANDELL KEITH
8725 WEST HIGGINS ROAD, SUITE 290
CHICAGO, IL 60631
    X    
BYBEE CLINTON
8725 WEST HIGGINS ROAD, SUITE 290
CHICAGO, IL 60631
    X    

Signatures

/s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of the general partner of ARCH 02/13/2015
**Signature of Reporting Person Date

/s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of the general partner of GPLP 02/13/2015
**Signature of Reporting Person Date

/s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of GPLLC 02/13/2015
**Signature of Reporting Person Date

/s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell 02/13/2015
**Signature of Reporting Person Date

/s/ Mark McDonnell, as Attorney-in-Fact for Clinton Bybee 02/13/2015
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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).
(1) ARCH Venture Partners VI, L.P. (the "GPLP"), as the sole general partner of ARCH Venture Fund VI, L.P. ("ARCH"), may be deemed to beneficially own certain of the shares held by ARCH. The GPLP disclaims beneficial ownership of all shares held by ARCH in which the GPLP does not have an actual pecuniary interest. ARCH Venture Partners VI, LLC (the "GPLLC"), as the sole general partner of the GPLP, may be deemed to beneficially own certain of the shares held by ARCH.
(2) The GPLLC disclaims beneficial ownership of all shares held by ARCH in which it does not have an actual pecuniary interest. The managing directors of the GPLLC, Robert T. Nelsen, Keith Crandell and Clinton Bybee (together, the "Managing Directors"), are deemed to have voting and dispositive power over the shares held by ARCH, and may be deemed to beneficially own certain of the shares held by ARCH. The Managing Directors disclaim beneficial ownership of all shares held by ARCH in which they do not have an actual pecuniary interest.

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