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): August 16, 2017

ALTA MESA HOLDINGS, LP

(Exact name of registrant as specified in its charter)

15021 Katy Freeway, Suite 400

Houston, Texas, 77094

(Address of principal executive offices)

(281) 530-0991

(Registrant’s telephone number, including area code)

N/A

(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:

Indicated 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.    ☐

Item 7.01. Regulation FD Disclosure.

On August 16, 2017, Alta Mesa Holdings, LP, a Texas limited partnership (the “Company”), issued a press release announcing that it has entered into a definitive agreement to combine with Silver Run Acquisition Corporation II, a Delaware corporation (“SRII”), an energy-focused special purpose acquisition company, and SRII simultaneously entered into a definitive agreement to combine with Kingfisher Midstream, LLC (“Kingfisher”), a company engaged in the gathering, processing, and marketing of crude oil, natural gas, natural gas liquids, and condensate in the STACK play, subject to certain conditions contained in the definitive agreements (collectively, the “business combination”). The full text of the press release is included as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated into this Item 7.01 by reference.

In accordance with General Instruction B.2 of Form 8-K, the information set forth in this Item 7.01 and the attached Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

Legend Information

Forward-Looking Statements

This communication includes certain statements that may constitute “forward-looking statements” for purposes of the federal securities laws. Forward-looking statements include, but are not limited to, statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements may include, for example, statements about the parties’s ability to effect the business combination; the benefits of the business combination; the future financial performance of SRII following the business combination; changes in the Company’s and Kingfisher’s strategy, future operations, financial position, estimated revenues, and losses, projected costs, prospects, plans and objectives of management. These forward-looking statements are based on information available as of the date of this Current Report on Form 8-K, and current expectations, forecasts and assumptions, and involve a number of judgments, risks and uncertainties. Accordingly, forward-looking statements should not be relied upon as representing the Company’s views as of any subsequent date, and the Company does not undertake any obligation to update forward-looking statements to reflect events or circumstances after the date they were made, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws. You should not place undue reliance on these forward-looking statements. As a result of a number of known and unknown risks and uncertainties, the Company’s actual results or performance may be materially different from those expressed or implied by these forward-looking statements. Some factors that could cause actual results to differ include: (i) the occurrence of any event, change or other circumstances that could delay the business combination or give rise to the termination of the definitive agreements relating to the business combination; (ii) the outcome of any legal proceedings that may be instituted against the Company following announcement of the proposed business combination; (iii) the inability to complete the business combination due to the failure to obtain approval of the stockholders of SRII, or other conditions to closing in the definitive agreements relating to the business combination; (iv) the risk that the proposed business combination disrupts current plans and operations of the Company, SRII or Kingfisher as a result of the announcement and consummation of the proposed business combination; (v) the Company’s ability to realize the anticipated benefits of the business combination, which may be affected by, among other things, competition and the ability of the Company to grow and manage growth profitably following the business combination; (vi) costs related

to the business combination; (vii) changes in applicable laws or regulations; and (viii) the possibility that the Company, SRII or Kingfisher may be adversely affected by other economic, business, and/or competitive factors.

No Offer or Solicitation

This Current Report is for informational purposes only and shall not constitute an offer to sell or the solicitation of an offer to buy any securities pursuant to the proposed business combination or otherwise, nor shall there be any sale of securities in any jurisdiction in which the offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act.

SIGNATURE

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.

Exhibit Index