| 1 | M E Klein & Associates, Inc. | Norman, OK 73070 | Oil & Gas Operator | Aug 2024 |
| 2 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2024 |
| 3 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 4 | Mallon Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 5 | Mandarin Oil & Gas Company | Austin, TX 78714 | Oil & Gas Operator | Dec 2024 |
| 6 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2024 |
| 7 | Markay Oil & Gas Company | Midland, TX 79701 | Oil & Gas Operator | Sep 1998 |
| 8 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 9 | Martin Oil Co. | Aspermont, TX 79502 | Oil & Gas Operator | Jul 2023 |
| 10 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2024 |
| 11 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 12 | Mathis & Sons, Inc. | Rule, TX 79547 | Oil & Gas Operator | Dec 2024 |
| 13 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 14 | McCutchin, Jerry | Dallas, TX 75380 | Oil & Gas Operator | Mar 2008 |
| 15 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Dec 2024 |
| 16 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 17 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2024 |
| 18 | Melton Operating Co. | Friendswood, TX 77546 | Oil & Gas Operator | Jul 2005 |
| 19 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 20 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 21 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 22 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 23 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2024 |
| 24 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2024 |
| 25 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 26 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Dec 2024 |
| 27 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 28 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2024 |
| 29 | MMG Oil Company | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2006 |
| 30 | Moore Investment Co. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2024 |
| 31 | Moriah Resources, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 32 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Dec 2024 |
| 33 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 34 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 35 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 36 | MWL Energy LLC | Hamlin, TX 79520 | Oil Operator | Dec 2024 |