X0306 4 2015-02-12 0 0001326732 Xencor Inc XNCR 0001291972 Baracchini Edgardo Jr C/O XENCOR, INC. 111 WEST LEMON AVENUE MONROVIA CA 91016 0 1 0 0 Chief Business Officer Common Stock 2204 D Stock Option (right to buy) 15.69 2015-02-12 4 A 0 50000 0.00 A 2025-02-11 Common Stock 50000 50000 D Voluntary reporting of the acquisition of 1,049 shares of Common Stock by the Reporting Person on June 10, 2014 and 1,155 shares of Common Stock on December 11, 2014 pursuant to the Issuer's Employee Stock Purchase Plan. 25% of the shares subject to the option shall vest on the one year anniversary of February 12, 2015 (the "Vesting Commencement Date"), and 1/48th of the shares shall vest monthly thereafter, such that the option shall be fully vested and exercisable on the four year anniversary of the Vesting Commencement Date. /s/ John J. Kuch, Attorney-in-Fact 2015-02-13