ANTERO MIDSTREAM PARTNERS LP (NYSE:AM) Files An 8-K Regulation FD Disclosure
Item 7.01 Regulation FD Disclosure

On January 2, 2019, Antero Midstream Partners LP, a Delaware limited partnership (“Antero Midstream”) and Antero Midstream GP LP, a Delaware limited partnership (“AMGP”) announced that Antero Midstream unitholders and AMGP shareholders of record at the close of business on January11, 2019 will be entitled to vote at special meetings of Antero Midstream unitholders and AMGP shareholders, respectively, which will be held to vote on the previously announced simplification transaction between the two companies and certain of their affiliates. The special meetings are expected to be held during the first quarter of 2019, and Antero Midstream and AMGP will issue a subsequent announcement when the date and times of the meetings have been set.

The information disclosed in this Item 7.01 is being furnished and shall not be deemed “filed” for purposes of Section18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act except as expressly set forth by specific reference in such filing.

Item 7.01 Other Events.

To the extent required by law, the information in Item 7.01 of this Form 8-K is incorporated into this Item 7.01.

No Offer or Solicitation

This Current Report includes a discussion of a proposed simplification transaction between Antero Midstream and AMGP. This communication is for informational purposes only and does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval, in any jurisdiction, to the transaction or otherwise, nor shall there be any sale, issuance, exchange or transfer of the securities referred to in this document in any jurisdiction in contravention of applicable law. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section10 of the Securities Act of 1933, as amended.

Additional Information And Where To Find It

In connection with the transaction, AMGP has filed with the U.S. Securities and Exchange Commission (“SEC”) a registration statement on FormS-4, that includes a joint proxy statement of Antero Midstream and AMGP and a prospectus of AMGP. The transaction will be submitted to Antero Midstream’s unitholders and AMGP’s shareholders for their consideration. Antero Midstream and AMGP may also file other documents with the SEC regarding the transaction. The registration statement on FormS-4 has not been declared effective by the SEC, and the definitive joint proxy statement/prospectus has not yet been delivered to Antero Midstream unitholders or AMGP shareholders. This document is not a substitute for the registration statement and joint proxy statement/prospectus that has been filed with the SEC or any other documents that AMGP or Antero Midstream may file with the SEC or send to shareholders of AMGP or unitholders of Antero Midstream in connection with the transaction. INVESTORS AND SECURITY HOLDERS OF ANTERO MIDSTREAM AND AMGP ARE URGED TO READ THE REGISTRATION STATEMENT AND THE JOINT PROXY STATEMENT/PROSPECTUS REGARDING THE TRANSACTION AND ALL OTHER RELEVANT DOCUMENTS THAT ARE FILED OR WILL BE FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE TRANSACTION AND RELATED MATTERS.

Investors and security holders will be able to obtain free copies of the registration statement and the joint proxy statement/prospectus (when available) and all other documents filed or that will be filed with the SEC by AMGP or Antero Midstream through the website maintained by the SEC at http://www.sec.gov. Copies of documents filed with the SEC by Antero Midstream will be made available free of charge on Antero Midstream’s website at http://investors.anteromidstream.com/investor-relations/AM, under the heading “SEC Filings,” or by directing a request to Investor Relations, Antero Midstream Partners LP, 1615 Wynkoop Street, Denver, Colorado 75219, Tel. No.(303) 357-7310. Copies of documents filed with the SEC by AMGP will be made available free of charge on AMGP’s website at http://investors.anteromidstreamgp.com/Investor-Relations/AMGP or by directing a request to Investor Relations, Antero Midstream GP LP, 1615 Wynkoop Street, Denver, Colorado 75219, Tel. No.(303) 357-7310.