X0306 4 2016-01-22 0 0001509190 ARATANA THERAPEUTICS, INC. PETX 0001352447 St Peter Steven C/O ARATANA THERAPEUTICS, INC. 11400 TOMAHAWK CREEK PARKWAY, SUITE 340 LEAWOOD KS 66211 1 1 0 0 PRESIDENT AND CEO Common Stock 2016-01-22 4 A 0 97500 0.00 A 792793 D Common Stock 86997 I By LLC Stock Option (Right to Buy) 3.14 2016-01-22 4 A 0 160000 0.00 A 2026-01-21 Common Stock 160000 160000 D Held in the name of Vie Venture LLC, a Delaware limited liability company ("Vie Venture"). The Reporting Person has sole voting and dispositive power over the shares held by Vie Venture, but disclaims beneficial ownership of the shares held thereby except to the extent of his pecuniary interest therein. Vests as to 25% of the total number of shares (rounded down to the nearest whole share) on January 29, 2017 and as to an additional 1/48th of the total number of shares (rounded down to the nearest whole share) on the same day of each of the 36 successive calendar months thereafter, such that the stock option shall be vested as to all shares on January 29, 2020, subject to continued service with the Issuer through the applicable vesting dates. /s/ John C. Ayres as Attorney-in-Fact for Steven St. Peter 2016-01-26