EXHIBIT A JOINT FILING AGREEMENT
EXHIBIT A
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 Infinity 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 16th day of February, 2010.
VENROCK ASSOCIATES | ||||
By: | A General Partner | |||
VENROCK ASSOCIATES III, L.P. | ||||
By: | Venrock Management III, LLC | |||
Its: | General Partner | |||
VENROCK ENTREPRENEURS FUND III, L.P. | ||||
By: | VEF Management III, LLC | |||
Its: | General Partner | |||
By: | /s/ Xxxxx X. Xxxxx | |||
Authorized Signatory |
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