| 1 | M E Klein & Associates LLC | Washington, OK 73093-4663 | Oil & Gas Operator | Jul 2025 |
| 2 | M K W Inc | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Dec 2009 |
| 3 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2025 |
| 4 | M M Resources, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 5 | Mack Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Nov 2000 |
| 6 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Jul 2025 |
| 7 | Magaw & Zimmer | Perry, OK 73077-1055 | Oil & Gas Operator | Aug 2013 |
| 8 | Maggard Oil Co Inc | Manford, OK 74044 | Oil & Gas Operator | Sep 1997 |
| 9 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 10 | Magnolia Petroleum Inc | Tulsa, OK 74106-2433 | Oil Operator | Jun 2018 |
| 11 | Maier Resources Inc | Oklahoma City, OK 73157-2996 | Oil & Gas Operator | Mar 2015 |
| 12 | Mallard Oil & Gas | Cody, WY 82414-9640 | Oil & Gas Operator | Oct 2019 |
| 13 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 14 | Manna Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Dec 2014 |
| 15 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 16 | Mar-Bar Enterprises Inc | Cushing, OK 74023-3031 | Oil Operator | Jun 2025 |
| 17 | Marbet LLC | Edmond, OK 73013-6691 | Oil & Gas Operator | Jun 2025 |
| 18 | Marcus Exploration Inc | Piedmont, OK 73078-0308 | Oil & Gas Operator | Dec 2000 |
| 19 | Marjo Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Oct 1999 |
| 20 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Jun 2025 |
| 21 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 22 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jun 2025 |
| 23 | Martin'S Resources LLC | Woodward, OK 73801-5641 | Oil & Gas Operator | Jun 2025 |
| 24 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 25 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 26 | Matthews Florine D | Bristow, OK 74010 | Oil & Gas Operator | Jan 2020 |
| 27 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jul 2025 |
| 28 | May Petroleum, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 29 | McAninch J W | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2000 |
| 30 | McAninch Michael E | Tonkawa, OK 74653-4415 | Oil & Gas Operator | May 2013 |
| 31 | McAninch W Kent | Tonkawa, OK 74653-4216 | Oil & Gas Operator | Oct 2016 |
| 32 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Aug 2025 |
| 33 | McMillin C C & Company Inc | Guthrie, OK 73044 | Oil & Gas Operator | Jun 2025 |
| 34 | McNeal Production Inc | Perry, OK 73077-0268 | Oil & Gas Operator | Nov 2014 |
| 35 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 36 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jul 2025 |
| 37 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 38 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 39 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 40 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 41 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 42 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 43 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 44 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 45 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 46 | Moabb Oil Corp | | Oil & Gas Operator | Apr 1998 |
| 47 | Montego Resources Inc | Oklahoma City, OK 73172-0192 | Oil & Gas Operator | Mar 2015 |
| 48 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2025 |
| 49 | Moore Clay | Bradenton, FL 34211 | Oil & Gas Operator | Jun 2025 |
| 50 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 51 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Jul 2025 |
| 52 | Morris Pete Drilling Company | | Oil Operator | Feb 1999 |
| 53 | MT Dora Energy Corporation | Duncan, OK 73533-1829 | Oil & Gas Operator | Apr 2014 |
| 54 | MT Dora Energy LLC | Houston, OK 77056-1940 | Oil & Gas Operator | Jun 2019 |
| 55 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Oct 2025 |
| 56 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Jul 2025 |
| 57 | Muegge, Clay A. | Lamont, OK 74643 | Oil & Gas Operator | Jul 2025 |
| 58 | Mullen William Company | Edmond, OK 73083-1372 | Oil & Gas Operator | May 1999 |
| 59 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 60 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |