| 1 | M & T Production Company LLC | Tulsa, OK 74132-3742 | Oil Operator | Apr 2011 |
| 2 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2025 |
| 3 | M M Resources, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 4 | M-S-C Corporation | Houston, TX 77027 | Oil Operator | May 1994 |
| 5 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 6 | Magellan Exploration Co LTD | Bethany, OK 73008-0909 | Oil & Gas Operator | Jun 2014 |
| 7 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Jul 2025 |
| 8 | Maguire James Q Inc | Norman, OK 73070-1748 | Oil & Gas Operator | Jun 2011 |
| 9 | Majors Eugene E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Jun 2025 |
| 10 | Majors John Dba Majors Production Co | Weleetka, OK 74880 | Oil & Gas Operator | Jun 2025 |
| 11 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 12 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 13 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Jun 2025 |
| 14 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 15 | Mason, Tommy L | | Oil & Gas Operator | May 2013 |
| 16 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 17 | Matna Enterprises LLC | Maud, OK 74854-2812 | Oil & Gas Operator | Jun 2025 |
| 18 | Matthews Florine D | Bristow, OK 74010 | Oil & Gas Operator | Jan 2020 |
| 19 | Matthews Oil & Gas LLC | Weleetka, OK 74880-7312 | Oil & Gas Operator | Apr 2020 |
| 20 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Oct 2025 |
| 21 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 22 | McNeill Randy & W R | Okmulgee, OK 74447 | Oil & Gas Operator | Nov 2013 |
| 23 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 24 | Mega Natural Gas Co | Tulsa, OK 74133 | Oil & Gas Operator | Jul 1996 |
| 25 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 26 | Meyerhoff & Cox Inc | Tulsa, OK 74135-7830 | Oil Operator | Aug 1993 |
| 27 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 28 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 29 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 30 | Mija LLC | Oklahoma City, OK 73151 | Oil & Gas Operator | Jul 2025 |
| 31 | Miller B Investments | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2007 |
| 32 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 33 | Mitchell Cecil D | Haskell, OK 74436-7667 | Oil & Gas Operator | Apr 2020 |
| 34 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Oct 2025 |
| 35 | Mode Oil & Gasdev LTD12/21/Ofb 9-98 | | Oil & Gas Operator | May 2013 |
| 36 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Jun 2025 |
| 37 | Montgomery Jake E | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 38 | Montgomery Oil & Gas Expl Inc | Tulsa, OK 74170-1884 | Oil & Gas Operator | Mar 2005 |
| 39 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Jul 2025 |
| 40 | Morgan Robert M / L Ladean | Wewoka, OK 74884 | Oil & Gas Operator | Jul 2015 |
| 41 | Mott Petroleum Corporation | Sugar Land, TX 77487 | Oil & Gas Operator | Aug 2024 |