Aratana Therapeutics, Inc. Watch

from S-3 51 pages Aratana Therapeutics, Inc. Indenture Dated as of , 20__ Wilmington Trust, National Association Trustee

from 8-K 3 pages Aratana Therapeutics, Inc. 1901 Olathe Boulevard Kansas City, Ks 66103 October 15, 2013

from S-1/A 2 pages Incorporated Under the Laws of the State of Delaware This Certifies That Is the Record Holder of Countersigned and Registered: American Stock Transfer & Trust Company, LLC (Brooklyn, Ny) Transfer Agent and Registrar by Authorized Signature Cusip 03874p 10 1 See Reverse for Certain Definitions Transferable on the Books of the Corporation by the Holder Hereof in Person or by Duly Authorized Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate Is Not Valid Until Countersigned by the Transfer Agent and Registered by the Registrar. Witness the Facsimile Signatures of the Corporation’s Duly Authorized Officers. Dated: Ati Fully Paid and Nonassessable Shares of Common Stock, $0.001 Par Value, of Aratana Therapeutics, Inc. President and Chief Executive Officer Chief Financial Officer Aratana Therapeutics, Inc. Aratana T H E R a P E U T I C S Specimen Aratana Therapeutics, Inc

from S-1/A 2 pages Indenture or similar