| 1 | M & M Exploration, Inc. | Westminster, CO 80031 | Oil & Gas Operator | Jul 2025 |
| 2 | M & M Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Jun 2025 |
| 3 | M & M Well Service, LLC | Medicine Lodge, KS 67104 | Gas Operator | Jun 2025 |
| 4 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2025 |
| 5 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 6 | Mallonee-Mahoney | | Oil & Gas Operator | Dec 1994 |
| 7 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 8 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 9 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 10 | Marexco, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Jun 2025 |
| 11 | Martin Oil Producers, Inc. | Garland, TX 75046 | Oil & Gas Operator | Aug 2013 |
| 12 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 13 | McCandless Rober | | Oil & Gas Operator | May 1991 |
| 14 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 15 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Aug 2025 |
| 16 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 17 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 18 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 19 | McGinness Oil Company Of Kansas, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Nov 2019 |
| 20 | McGinnis Oil | | Oil & Gas Operator | Dec 2002 |
| 21 | McGrath, Rollie | Lake City, KS 67071 | Gas Operator | Jun 2025 |
| 22 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 23 | Mega Petroleum C | | Oil Operator | Jun 1990 |
| 24 | Merit Energy Company, LLC | Dallas, TX 75009 | Oil & Gas Operator | Jun 2025 |
| 25 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Jun 2025 |
| 26 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 27 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 28 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Jun 2025 |
| 29 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 30 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Jun 2025 |
| 31 | Mills, Norman | Lake City, KS 67071 | Oil Operator | Dec 1995 |
| 32 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |
| 33 | Molz Oil Company | Kiowa, KS 67070 | Oil & Gas Operator | Jul 2025 |
| 34 | Morsey Oil & Gas | | Oil & Gas Operator | Mar 1995 |
| 35 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Aug 2025 |
| 36 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 37 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2025 |
| 38 | Musgrove Petrole | | Oil & Gas Operator | Dec 1996 |
| 39 | Musgrove, Casey Oil | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jun 2017 |
| 40 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 41 | MV Purchasing LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |