X0202 SCHEDULE 13G/A 0001140361-25-035747 0000949615 XXXXXXXX LIVE 1 COMMON UNITS 04/08/2026 0001980088 Mach Natural Resources LP 55445L100 14201 Wireless Way Suite 300 Oklahoma City OK 73134 Rule 13d-1(c) KAYNE ANDERSON CAPITAL ADVISORS, L.P. DE 15517713 0 15517713 0 15517713 9.23 IA Mach Natural Resources LP 14201 Wireless Way, Suite 300, Oklahoma City, Oklahoma, 73134 Kayne Anderson Capital Advisors, L.P. 2121 Avenue of the Stars, Ninth Floor Los Angeles, CA 90067 Kayne Anderson Capital Advisors, L.P. is a Delaware limited partnership N IA Kayne Anderson Capital Advisors, L.P. Managed Accounts 15,517,713 9.23% 15,517,713 0 15,517,713 0 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Exhibit 99.1 KAYNE ANDERSON CAPITAL ADVISORS, L.P. /S/ MICHAEL O'NEIL 04/08/2026