X0306 4 2021-08-26 0001433270 ANTERO RESOURCES Corp AR 0001370287 Keenan W Howard JR C/O YORKTOWN PARTNERS LLC 410 PARK AVENUE, 20TH FLOOR NEW YORK NY 10022 true Common stock, par value $0.01 per share 2021-08-26 4 S 0 100000 13.0549 D 9282570 I See footnote Common stock, par value $0.01 per share 2021-08-27 4 S 0 600000 13.6371 D 8682570 I See footnote Common stock, par value $0.01 per share 2021-08-30 4 S 0 265013 13.8419 D 8417557 I See footnote Common stock, par value $0.01 per share 329421 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.86 to $13.15, inclusive. The reporting person undertakes to provide to the Antero Resources Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this 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 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.05 to $14.00, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.70 to $14.02, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/ W. Howard Keenan, Jr. 2021-08-30