X0306 4 2019-03-12 0 0001598968 Antero Midstream Partners LP AM 0001370287 Keenan W Howard JR C/O YORKTOWN PARTNERS LLC 410 PARK AVENUE, 19TH FLOOR NEW YORK NY 10022 1 0 0 0 Common Units representing limited partner interests 2019-03-12 4 D 0 15666 D 0 D On March 12, 2019, Antero Midstream GP LP ("AMGP") converted from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"). Simultaneously with the Conversion, Antero Midstream Merger Sub LLC, a Delaware limited liability company and wholly owned subsidiary of Antero Midstream Newco Inc., a Delaware corporation and wholly owned subsidiary of the New AM, was merged with and into Antero Midstream Partners LP, a Delaware limited partnership ("Antero Midstream"), with Antero Midstream surviving such merger as an indirect wholly owned subsidiary of New AM (the "Merger"), as a result of which all outstanding common units of Antero Midstream were converted into an aggregate of approximately $598.7 million in cash and approximately 303.1 million shares of common stock, par value $0.01 per share (the "Merger Shares"). (Continued from Footnote 1) In connection, with the Merger, the reporting person made an election to convert his outstanding common units of Antero Midstream into Merger Shares and cash for consideration of $3.415 in cash and 1.6350 in Merger Shares per outstanding common unit of Antero Midstream. /s/ W. Howard Keenan, Jr. 2019-03-14