| 1 | M & G Oil Inc | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 2 | M E Klein & Associates, Inc. | Norman, OK 73070 | Oil & Gas Operator | Feb 2026 |
| 3 | Mad Operators LLC | | Oil & Gas Operator | Feb 2026 |
| 4 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 5 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 6 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2026 |
| 7 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Feb 2026 |
| 8 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 9 | Maxwell Operating Co., Inc. | Englewood, CO 80155 | Oil Operator | Jan 2007 |
| 10 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Feb 2026 |
| 11 | Meltzer Oil Comp | | Oil Operator | Dec 1983 |
| 12 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Feb 2026 |
| 13 | Meridian Energy Inc. | | Oil Operator | Feb 2026 |
| 14 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 15 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Feb 2026 |
| 16 | Mike Kelso Oil, Inc. | Chase, KS 67524 | Oil & Gas Operator | Feb 2026 |
| 17 | MJT Oil | | Oil Operator | Feb 2026 |
| 18 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |
| 19 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 20 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 21 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2026 |
| 22 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2019 |
| 23 | Mustang Energy Corporation | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 24 | Myers Robert W J | | Oil Operator | Jun 1991 |