X0306 4 2019-03-12 0 0001623925 Antero Midstream Corp AM 0001210407 YORKTOWN ENERGY PARTNERS V LP 410 PARK AVENUE, 19TH FLOOR NEW YORK NY 10022 1 0 1 0 Common shares representing limited partner interests 2019-03-12 4 D 0 1875502 D 0 D Common Stock 2019-03-12 4 D 0 1875502 A 1875502 D On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM. Yorktown V is a director-by-deputization solely for purposes of Section 16 of the Exchange Act. Yorktown Energy Partners V, L.P., By: Yorktown V Company LLC, its general partner, /s/ W. Howard Keenan, Jr., Managing Member 2019-03-14