X0306 4 2015-02-19 1 0001600132 Bellerophon Therapeutics, Inc. BLPH 0001222135 ARCH VENTURE FUND VI LP 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001274410 ARCH VENTURE PARTNERS VI LP 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001274412 ARCH VENTURE PARTNERS VI LLC 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001219039 CRANDELL KEITH 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001219043 BYBEE CLINTON 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 Common Stock 2015-02-19 4 P 0 212666 12 A 965660 D 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. 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 2015-02-23 /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of the general partner of GPLP 2015-02-23 /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of GPLLC 2015-02-23 /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell 2015-02-23 /s/ Mark McDonnell, as Attorney-in-Fact for Clinton Bybee 2015-02-23