X0609 4 2026-09-15 0 0001980088 MACH NATURAL RESOURCES LP MNR 0001730172 McMullen William Wallace false 14201 WIRELESS WAY SUITE 300 OKLAHOMA CITY OK 73134 1 0 1 1 See Remarks 0001742941 BAYOU CITY ENERGY MANAGEMENT LLC false C/O BAYOU CITY ENERGY, L.P. 2229 SAN FELIPE STREET, SUITE 1075 HOUSTON TX 77019 0 0 1 0 0 Common Units 2026-09-15 4 P 0 22124 11.25 A 22124 D Common Units 2026-09-15 4 P 0 12390 11.30 A 74872307 I See footnote The price reported in Column 4 is a weighted average price. These common units were purchased by Bayou City Energy Management LLC ("BCEM") in multiple transactions at prices ranging from $11.28 to $11.30, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote (1) to this Form 4. The reported common units are directly held 74,835,939 by BCE Mach Aggregator LLC ("BCE Aggregator") and 36,368 by BCEM. BCE Aggregator is indirectly managed by BCEM. William W. McMullen is the Managing Partner of BCEM. Accordingly, William W. McMullen may be deemed to beneficially own the securities directly held by BCE Aggregator and BCEM, as applicable, but disclaims beneficial ownership of such common units except to the extent of his pecuniary interest therein. William W. McMullen is a Director of Mach Natural Resources GP LLC, the general partner of the Issuer (the "General Partner"). The Issuer is managed by the directors and executive officers of the General Partner. William W. McMullen, By: /s/ William W. McMullen 2026-09-17 Bayou City Energy Management LLC, By: /s/ William W. McMullen, Name: William W. McMullen, Title: Managing Partner 2026-09-17