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): January 20, 2015

CONE MIDSTREAM PARTNERS LP

(Exact name of registrant as specified in its charter)

1000 CONSOL Energy Drive

Canonsburg, Pennsylvania 15317

(Address of principal executive offices and zip code)

(724) 485-4000

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

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:

Effective January 20, 2015, John Earl Jackson became a member of the Board of Directors (the “Board”) of CONE Midstream GP LLC (the “General Partner”), the general partner of CONE Midstream Partners LP (the “Partnership”). Mr. Jackson also became a member of the Audit Committee of the Board.

The Board has determined that (i) Mr. Jackson is “independent” for purposes of Section 10A-3 of the Securities Exchange Act of 1934, as amended, and the applicable rules and regulations of the U.S. Securities and Exchange Commission and (ii) Mr. Jackson has no material relationship with the General Partner or the Partnership that would interfere with his independence from management of the General Partner and that he will otherwise be an “independent director” for purposes of Section 303A.02 of the New York Stock Exchange’s Listed Company Manual.

There is no arrangement or understanding between Mr. Jackson and any other person pursuant to which Mr. Jackson was selected as a director. Mr. Jackson does not have any direct or indirect material interest in any transaction or series of similar transactions contemplated by Item 404(a) of Regulation S-K.

Mr. Jackson will receive an annual compensation package, which will initially consist of an annual cash retainer of $60,000 and an annual equity-based award granted under the Partnership’s long-term incentive plan having a value as of the grant date of approximately $80,000. Further, Mr. Jackson will be indemnified for his actions associated with being a director to the fullest extent permitted under Delaware law and will be reimbursed for all expenses incurred in attending to his duties as a director.

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.