UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of
the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): June 3, 2026

ANTERO MIDSTREAM CORPORATION

(Exact name of registrant as specified in its charter)

1615 Wynkoop Street

Denver, Colorado 80202

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, Including Area Code (303) 357-7310

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

On June 3, 2026, at the annual meeting of stockholders (the “Annual Meeting”) of Antero Midstream Corporation (the “Company”), the Company’s stockholders were requested to (i) elect three Class I members of the Board to serve until the Company’s 2029 annual meeting of stockholders; (ii) ratify the appointment of KPMG LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2026; (iii) approve, on an advisory basis, the compensation of the Company’s named executive officers; and (iv) approve, on an advisory basis, the frequency of future advisory votes on the compensation of the Company’s named executive officers. Each of these items is more fully described in the Company’s definitive proxy statement, which was filed with the Securities and Exchange Commission on April 23, 2026.

The results of the matters voted upon at the Annual Meeting are as follows:

Proposal No. 1 – Election of Class I Directors: Votes regarding the persons elected as Class III directors were as follows:

Proposal No. 2 — Ratification of the Appointment of KPMG LLP: The voting results were as follows:

Proposal No. 3 — Approval, on an Advisory Basis, of the Compensation of the Company’s Named Executive Officers: The voting results were as follows:

Proposal No. 4 — Approval, on an Advisory Basis, of the Frequency of Future Advisory Votes on the Compensation of the Company’s Named Executive Officers: The voting results were as follows:

The Company has determined that it will hold an advisory vote on executive compensation on an annual basis until the next stockholder advisory vote on this matter.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.