X0306 4 2017-10-10 0 0001433270 ANTERO RESOURCES Corp AR 0001370287 Keenan W Howard JR C/O YORKTOWN PARTNERS LLC 410 PARK AVENUE, 19TH FLOOR NEW YORK NY 10022 1 0 0 0 Common stock, par value $0.01 per share 2017-10-10 4 A 0 2458 0.0000 A 137171 D Common stock, par value $0.01 per share 235380 I See footnote Common stock, par value $0.01 per share 215319 I See footnote Common stock, par value $0.01 per share 5368049 I See footnote Common stock, par value $0.01 per share 10425078 I See footnote The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose. These securities are owned directly by Yorktown Energy Partners V, L.P. ("Yorktown V"). The reporting person is a member and manager of Yorktown V Company LLC, the general partner of Yorktown V. These securities are owned directly by Yorktown Energy Partners VI, L.P. ("Yorktown VI"). The reporting person is a member and manager of Yorktown VI Associates LLC, the general partner of Yorktown VI Company LP, the general partner of Yorktown VI. These securities are owned directly by Yorktown Energy Partners VII, L.P. ("Yorktown VII"). The reporting person is a member and manager of Yorktown VII Associates LLC, the general partner of Yorktown VII Company LP, the general partner of Yorktown VII. These securities are owned directly by Yorktown Energy Partners VIII, L.P. ("Yorktown VIII"). The reporting person is a member and manager of Yorktown VIII Associates LLC, the general partner of Yorktown VIII Company LP, the general partner of Yorktown VIII. /s/ Alvyn A. Schopp, as attorney-in-fact for W. Howard Keenan, Jr. 2017-10-12