Antero Midstream GP LP announced that on April 26, 2018, the board appointed Peter A. Dea to the Board to serve until his death, resignation or removal. Also effective April 26, 2018, Mr. Dea was appointed to serve on the Board's Audit Committee. There are no understandings or arrangements between Mr. Dea and any other person pursuant to which Mr. Dea was selected to serve as a director of the Board.