EXHIBIT A
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common Stock of Conatus Pharmaceuticals, Inc. and further agree that this agreement be included as an exhibit to such filing. Each party to the agreement expressly authorizes each other party to file on its behalf any and all amendments to such statement. Each party to this agreement agrees that this joint filing agreement may be signed in counterparts.
In evidence whereof, the undersigned have caused this Agreement to be executed on their behalf this 12th day of February, 2014.
| MPM BIOVENTURES IV-QP, L.P. | MPM BIOVENTURES IV GMBH & CO. BETEILIGUNGS KG | |||||||
| By: | MPM BioVentures IV GP LLC, its General Partner | By: | MPM BioVentures IV GP LLC, in its capacity as the Managing Limited Partner | |||||
| By: | MPM BioVentures IV LLC, its Managing Member | By: | MPM BioVentures IV LLC, its Managing Member | |||||
| By: | /s/ Luke Evnin | By: | /s/ Luke Evnin | |||||
| Name: Luke Evnin | Name: Luke Evnin | |||||||
| Title: Member | Title: Member | |||||||
| MPM ASSET MANAGEMENT INVESTORS BV4 LLC | MPM BIOVENTURES V, L.P. | |||||||
| By: | MPM BioVentures IV LLC its Manager | By: | MPM BioVentures V GP LLC, its General Partner | |||||
| By: | /s/ Luke Evnin Name: Luke Evnin Title: Member | By: | MPM BioVentures V LLC, its Managing Member | |||||
| By: | /s/ Luke Evnin | |||||||
| Name: Luke Evnin | ||||||||
| Title: Member | ||||||||
| MPM ASSET MANAGEMENT INVESTORS BV5 LLC | MPM BIOVENTURES IV GP LLC | |||||||
| By: | MPM BioVentures V LLC its Manager | By: | MPM BioVentures IV LLC, its Managing Member | |||||
| By: | /s/ Luke Evnin | By: | /s/ Luke Evnin | |||||
| Name: Luke Evnin | Name: | Luke Evnin | ||||||
| Title: Member | Title: | Member | ||||||
| MPM BIOVENTURES IV LLC | ||||||||
| By: | /s/ Luke Evnin | |||||||
| Name: | Luke Evnin | |||||||
| Title: | Member | |||||||
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MPM BIOVENTURES V GP LLC
| MPM BIOVENTURES V LLC | |||||||
| By: | MPM BioVentures V LLC, its Managing Member
| By: Name: Title: | /s/ Luke Evnin Luke Evnin Member | |||||
| By: | /s/ Luke Evnin | |||||||
| Name: | Luke Evnin | |||||||
| Title: | Member | |||||||
| By: | /s/ Luke Evnin | By: | /s/ Ansbert Gadicke | |||||
| Name: Luke Evnin | Name: Ansbert Gadicke |
| By: | /s/ Vaughn M. Kailian | By: | /s/ James Paul Scopa | |||||
| Name: Vaughn M. Kailian | Name: James Paul Scopa |
| By: | /s/ Todd Foley | |||||||
| Name: Todd Foley |
Page 22 of 22
