SEC Form 3

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 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* ARCH VENTURE FUND VI LP (Last) (First) (Middle) 8725 WEST HIGGINS ROAD, SUITE 290 (Street) CHICAGO IL 60631 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 02/13/2015	3. Issuer Name and Ticker or Trading Symbol Bellerophon Therapeutics, Inc. [ BLPH ]
		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 of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

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)

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: 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

1. Name and Address of Reporting Person* ARCH VENTURE FUND VI LP (Last) (First) (Middle) 8725 WEST HIGGINS ROAD, SUITE 290 (Street) CHICAGO IL 60631 (City) (State) (Zip)

1. Name and Address of Reporting Person* ARCH VENTURE PARTNERS VI LP (Last) (First) (Middle) 8725 WEST HIGGINS ROAD, SUITE 290 (Street) CHICAGO IL 60631 (City) (State) (Zip)

1. Name and Address of Reporting Person* ARCH VENTURE PARTNERS VI LLC (Last) (First) (Middle) 8725 WEST HIGGINS ROAD, SUITE 290 (Street) CHICAGO IL 60631 (City) (State) (Zip)

1. Name and Address of Reporting Person* CRANDELL KEITH (Last) (First) (Middle) 8725 WEST HIGGINS ROAD, SUITE 290 (Street) CHICAGO IL 60631 (City) (State) (Zip)

1. Name and Address of Reporting Person* BYBEE CLINTON (Last) (First) (Middle) 8725 WEST HIGGINS ROAD, SUITE 290 (Street) CHICAGO IL 60631 (City) (State) (Zip)

Explanation of Responses:

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.

	/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
	/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
	/s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of GPLLC	02/13/2015
	/s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell	02/13/2015
	/s/ Mark McDonnell, as Attorney-in-Fact for Clinton Bybee	02/13/2015
	** 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 5 (b)(v).
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