X0306 4 2019-12-16 0 0001326732 Xencor Inc XNCR 0001797034 Yang Allen C/O XENCOR, INC. 111 WEST LEMON AVENUE MONROVIA CA 91016 0 1 0 0 SVP, Chief Medical Officer Common Stock 2019-12-16 4 A 0 31900 0.00 A 31900 D Stock Option (Right to Buy) 37.59 2019-12-16 4 A 0 62300 0.00 A 2029-12-15 Common Stock 62300 62300 D Represents restricted stock units that vest as follows: 1/3 of the shares vest on the first, second and third anniversaries of the date of grant. 1/4th of the shares vest one year after December 16, 2019 (the "Vesting Commencement Date"); the balance of the shares vest in a series of 36 successive equal monthly installments measured from the first anniversary of the Vesting Commencement Date, subject to the optionholder's Continuous Service (as defined in the 2013 Equity Incentive Plan) as of each such date. /s/ Celia Eckert, Attorney-in-Fact 2019-12-18