| 1 | M E Klein & Associates LLC | Washington, OK 73093-4663 | Oil & Gas Operator | Mar 2025 |
| 2 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Mar 2025 |
| 3 | Mack Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Nov 2000 |
| 4 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Mar 2025 |
| 5 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Mar 2025 |
| 6 | Mallorn Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Feb 2025 |
| 7 | Maly & Maly Oil | Beggs, OK 74421-2844 | Oil & Gas Operator | Jan 2025 |
| 8 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2025 |
| 9 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 10 | Markley L C Corporation | Fletcher, OK 73541 | Oil & Gas Operator | Aug 2002 |
| 11 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2025 |
| 12 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 13 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Feb 2025 |
| 14 | Maxine Oil Company | Muskogee, OK 74401-0512 | Oil & Gas Operator | Sep 2014 |
| 15 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 16 | McClintock V C | Casper, WY 82601 | Oil & Gas Operator | May 2024 |
| 17 | McCord J K | Duncan, OK 73534-0032 | Oil Operator | Mar 2009 |
| 18 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 19 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Mar 2025 |
| 20 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Mar 2025 |
| 21 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 22 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Mar 2025 |
| 23 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 24 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 25 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 26 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jun 2025 |
| 27 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Feb 2025 |
| 28 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 29 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 30 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 31 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 32 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | Mar 2025 |
| 33 | Midwest Enterprises, Inc. | Cashion, OK 73016-9626 | Oil & Gas Operator | Jan 2025 |
| 34 | Mija LLC | Oklahoma City, OK 73151 | Oil & Gas Operator | Mar 2025 |
| 35 | Mild Oil Company | Duncan, OK 73533-9532 | Oil Operator | Mar 2000 |
| 36 | Minerva Oil Company | Tulsa, OK 74152-0858 | Oil & Gas Operator | Mar 2015 |
| 37 | Mink Oil Company | | Oil Operator | Nov 2003 |
| 38 | Mink Richard | Cement, OK 73017 | Oil & Gas Operator | Feb 2025 |
| 39 | Mobil Exp & Prod Us Inc | Houston, TX 77060-1991 | Oil & Gas Operator | May 2001 |
| 40 | Monexco Operating Company | Dallas, TX 75204-2634 | Oil & Gas Operator | Feb 2025 |
| 41 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Feb 2025 |
| 42 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Mar 2025 |
| 43 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2025 |
| 44 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 45 | Moore David K | Duncan, OK 73575 | Oil & Gas Operator | Oct 2009 |
| 46 | Mott Oil & Gas | Sugarland, TX 77478 | Oil & Gas Operator | May 2001 |
| 47 | Mott Petroleum Corporation | Sugar Land, TX 77487 | Oil & Gas Operator | Aug 2024 |
| 48 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 49 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 50 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 51 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 52 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |