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 8, 2018

KAYNE ANDERSON ACQUISITION CORP.

(Exact name of registrant as specified in its charter)

(713) 493-2000

(Registrant’s telephone number, including area code)

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

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.  ☐

Item 8.01 Other Events

On August 8, 2018, Kayne Anderson Acquisition Corp., a Delaware corporation (the “Company”), and Apache Corporation, a Delaware corporation (“Apache”), held a webcast regarding the proposed transaction in which Apache will contribute its midstream assets at Alpine High to Altus Midstream LP, a Delaware limited partnership that will be jointly owned by Apache and the Company (“Altus Midstream”). A copy of the transcript of the webcast is filed as Exhibit 99.1 hereto.

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 Apache’s and the Company’s ability to effect the business combination; the benefits of the business combination; the future financial performance of the Company following the business combination; changes in the Company’s or Apache’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 (this “Current Report”), 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 Apache’s or 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, Apache’s or Altus Midstream’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 Apache or 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 the Company, 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, the Alpine High Entities or Apache as a result of the announcement and consummation of the proposed business combination; (v) Apache’s or 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, the Alpine High Entities or Apache may be adversely affected by other economic, business, and/or competitive factors.

2

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 of 1933, as amended.

Important Information For Investors and Stockholders

In connection with the proposed business combination, the Company intends to file a proxy statement with the Securities and Exchange Commission ( the “SEC”). The definitive proxy statement and other relevant documents will be sent or given to the stockholders of the Company and will contain important information about the proposed business combination and related matters. The Company’s stockholders and other interested persons are advised to read, when available, the proxy statement in connection with the Company’s solicitation of proxies for the meeting of stockholders to be held to approve the business combination because the proxy statement will contain important information about the proposed business combination. When available, the definitive proxy statement will be mailed to the Company’s stockholders as of a record date to be established for voting on the business combination. Stockholders will also be able to obtain copies of the proxy statement, without charge, once available, at the SEC’s website at www.sec.gov.

Participants in the Solicitation

The Company and its directors and officers may be deemed participants in the solicitation of proxies of the Company’s stockholders in connection with the proposed business combination. The Company stockholders and other interested persons may obtain, without charge, more detailed information regarding the directors and officers of the Company in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 filed with the SEC on March 27, 2018. Additional information will be available in the definitive proxy statement when it becomes available.

3

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.

4