| 1 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Feb 2025 |
| 2 | Mack Energy Comp | | Oil & Gas Operator | Nov 1994 |
| 3 | Mad Operators LLC | | Oil & Gas Operator | Dec 2024 |
| 4 | Magnum Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2000 |
| 5 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 6 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Feb 2025 |
| 7 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Dec 2024 |
| 8 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 9 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 10 | Martin Oil Produ | | Oil & Gas Operator | Dec 1994 |
| 11 | Martin Oil Producers, Inc. | Garland, TX 75046 | Oil & Gas Operator | Aug 2013 |
| 12 | Mays Oil LLC | | Oil Operator | Apr 2021 |
| 13 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Mar 2025 |
| 14 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 15 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 16 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Dec 2024 |
| 17 | Michael D. Weilert Oil Company | | Oil Operator | Dec 2024 |
| 18 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 19 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2025 |
| 20 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 21 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Dec 2024 |
| 22 | Mike Kelso Oil, Inc. | Chase, KS 67524 | Oil & Gas Operator | Dec 2024 |
| 23 | Mishler Oil | | Oil Operator | May 1989 |
| 24 | Morrison-Dixon O | | Oil Operator | Oct 1993 |
| 25 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Feb 2025 |
| 26 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 27 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 28 | Mustang Energy Corporation | Hays, KS 67601 | Oil Operator | Dec 2024 |