| 1 | M & G Oil Company | Marble Falls, TX 78654 | Oil & Gas Operator | Oct 2025 |
| 2 | M G Oil Inc | Russell, KS 67665 | Oil Operator | Jun 2025 |
| 3 | M.A. Yost Operations, Inc | Russell, KS 67665 | Oil Operator | Jun 2025 |
| 4 | Mad Operators LLC | | Oil & Gas Operator | Jun 2025 |
| 5 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 6 | Mai Operations | | Oil Operator | Dec 1996 |
| 7 | Manning, Gregory | Ellinwood, KS 67526 | Oil Operator | Jun 2025 |
| 8 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 9 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 10 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Jun 2025 |
| 11 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 12 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 13 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 14 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |
| 15 | Martin Oil Produ | | Oil & Gas Operator | Dec 1994 |
| 16 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Oct 2025 |
| 17 | Maxwell Operating Co., Inc. | Englewood, CO 80155 | Oil Operator | Jan 2007 |
| 18 | Mays, Sam W., Jr. Estate | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2005 |
| 19 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Aug 2025 |
| 20 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 21 | Meier Joe Oil Op | | Oil Operator | Jul 1983 |
| 22 | Melrose Group In | | Oil Operator | Feb 1994 |
| 23 | Meltzer Oil Comp | | Oil Operator | Dec 1983 |
| 24 | Meridian Energy Inc. | | Oil Operator | Jun 2025 |
| 25 | Merit Energy Company, LLC | Dallas, TX 75009 | Oil & Gas Operator | Jun 2025 |
| 26 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 27 | Messman Corporation | Wichita, KS 67208 | Oil & Gas Operator | Jun 2025 |
| 28 | Michael D. Weilert Oil Company | | Oil Operator | Jun 2025 |
| 29 | Mid America Ener | | Oil Operator | Nov 1993 |
| 30 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2025 |
| 31 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Jun 2025 |
| 32 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 33 | Mike Kelso Oil, Inc. | Chase, KS 67524 | Oil & Gas Operator | Jun 2025 |
| 34 | Mikol Oil LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 35 | Miura Petroleum | | Oil Operator | Dec 1992 |
| 36 | MJT Oil | | Oil Operator | Jun 2025 |
| 37 | Mohawk Petroleum | | Oil & Gas Operator | Jan 1995 |
| 38 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 39 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Aug 2025 |
| 40 | Mustang Drilling | | Oil & Gas Operator | Nov 1996 |
| 41 | Mustang Energy Corporation | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 42 | MW Oil, Inc | | Oil & Gas Operator | Jun 2025 |