Kayne Anderson Energy Infrastructure Fund (KYN) N-CSRS Certified semi-annual shareholder report (management investment company)

EXHIBIT 99.906 CERT

SECTION 906 CERTIFICATIONS

James C. Baker, Principal Executive Officer, and Terry A. Hart, Principal Financial Officer, of Kayne Anderson MLP/Midstream Investment Company (the “Company”), each certify to his knowledge that:

1. The Company’s periodic report on Form N-CSR for the semi-annual period ended May 31, 2020 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

July 29, 2020

/s/ JAMES C. BAKER	/s/ TERRY A. HART
James C. Baker	Terry A. Hart
Chairman of the Board of Directors, President and Chief Executive Officer	Chief Financial Officer, Treasurer and Assistant Secretary