X0306 4 2013-10-10 0 0001433270 ANTERO RESOURCES Corp AR 0001370287 Keenan W Howard JR 410 PARK AVENUE, 19TH FLOOR NEW YORK NY 10022 1 0 0 0 Options to purchase Common Stock 54.15 2013-10-10 4 A 0 1477 0 A Common Stock, par value $0.01 per share 1477 1477 D Each option to purchase Common Stock of the Issuer vests and becomes exercisable in a single installment one year from the date of grant, or October 10, 2014. Each option to purchase Common Stock of the Issuer expires ten years from the date of grant, or October 10, 2023. /s/ Alvyn A. Schopp, as attorney-in-fact for W. Howard Keenan, Jr. 2013-10-15