| 1 | M & B Well Servi | | Oil Operator | Aug 1990 |
| 2 | M & C Oil Inc | Indianola, NE 68034 | Oil & Gas Operator | Nov 2013 |
| 3 | M & C Oil Incorp | | Oil Operator | Mar 1995 |
| 4 | M & D Oil And Gas, LLC | Sterling, KS 67579 | Oil Operator | Sep 2025 |
| 5 | M & D Oil Co, A General Partnership | Beaver, OK 73932 | Gas Operator | Oct 2022 |
| 6 | M & G Oil Company | Marble Falls, TX 78654 | Oil & Gas Operator | Feb 2026 |
| 7 | M & G Oil Inc | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 8 | M & K Oil Company | Gillette, WY 82717-3470 | Oil & Gas Operator | Dec 2025 |
| 9 | M & L Oil Compan | | Oil Operator | Jun 1993 |
| 10 | M & M Contractin | | Oil Operator | Mar 1992 |
| 11 | M & M Exploration Inc | Westminster, CO 80031 | Oil & Gas Operator | Dec 2025 |
| 12 | M & M Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Sep 2025 |
| 13 | M & M Resources Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 14 | M & M Well Service, LLC | Medicine Lodge, KS 67104 | Gas Operator | Sep 2025 |
| 15 | M & O Oil Co.A General Partnership | Fredonia, KS 66736 | Oil Operator | May 2025 |
| 16 | M & S Energy, LLC | El Dorado, KS 67042 | Oil Operator | Jun 2019 |
| 17 | M & W Oil LLC | Hamilton, KS 66853 | Oil Operator | Nov 2015 |
| 18 | M D B Operations | | Oil Operator | Dec 1988 |
| 19 | M E Klein & Associates, Inc. | Norman, OK 73070 | Oil & Gas Operator | Sep 2025 |
| 20 | M H Oil & Gas | Chanute, KS 66720 | Oil & Gas Operator | Aug 1998 |
| 21 | M M Energy Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2025 |
| 22 | M M Resources In | | Gas Operator | Feb 1990 |
| 23 | M S Drilling Company | | Oil Operator | Feb 2025 |
| 24 | M&M Services LLC | Neodesha, KS 66757 | Gas Operator | Sep 2025 |
| 25 | M-J Oil Company Inc. | Minerva, OH 44657 | Oil & Gas Operator | Dec 2008 |
| 26 | M. A. B. Production | | Oil Operator | Nov 2009 |
| 27 | M. J. T. Enterprises | | Oil Operator | Sep 2025 |
| 28 | M. K. Fuhrman LLC | | Oil Operator | Sep 2025 |
| 29 | M.A. Yost Operations, Inc | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 30 | M.A.E. Resources, Inc. | Parker, KS 66072 | Oil Operator | Sep 2011 |
| 31 | M.C.E. Trust Group, A General Partnership | Cherryvale, KS 67335 | Oil & Gas Operator | Sep 2009 |
| 32 | M.O.K.A.T. | Bartlesville, OK 74003 | Oil Operator | Jun 2001 |
| 33 | M.T.M. Petroleum | | Oil & Gas Operator | Oct 1995 |
| 34 | M3 Helium Corp | | Gas Operator | Sep 2025 |
| 35 | Mach Petroleum, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | Nov 2014 |
| 36 | Macha Enterprises, Inc. | Wichita Falls, TX 76309 | Oil Operator | Feb 2026 |
| 37 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Dec 2025 |
| 38 | Mack Energy Comp | | Oil & Gas Operator | Nov 1994 |
| 39 | Maco Incorporate | | Oil Operator | Jun 1984 |
| 40 | Mad Dog Oil Co. | | Oil Operator | Mar 2016 |
| 41 | Mad Operators LLC | | Oil & Gas Operator | Sep 2025 |
| 42 | Magnatex Petrole | | Oil Operator | Jun 1994 |
| 43 | Magnatex Petroleum | | Oil Operator | Apr 1993 |
| 44 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 45 | Magnum Exploration Kansas, LLC | Lipan, TX 76462 | Oil Operator | Oct 2016 |
| 46 | Magnum Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2000 |
| 47 | Magnusson Karl E | | Oil Operator | Apr 1987 |
| 48 | Mahoney Drilling | | Gas Operator | Jan 1982 |
| 49 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 50 | Mai Operations | | Oil Operator | Dec 1996 |
| 51 | Major Oil Compan | | Oil Operator | Mar 1988 |
| 52 | Mak Oil & Gas Co | | Oil Operator | Mar 2009 |
| 53 | Mako Operating Company, LLC | Andover, KS 67002 | Gas Operator | May 2002 |
| 54 | Mallonee-Mahoney | | Oil & Gas Operator | Dec 1994 |
| 55 | Malone Donald J | | Oil Operator | Nov 1993 |
| 56 | Malone Oil Co. | | Oil & Gas Operator | Jul 2006 |
| 57 | Malone Oil Compa | | Oil Operator | Dec 1994 |
| 58 | Manning, Gregory | Ellinwood, KS 67526 | Oil Operator | Sep 2025 |
| 59 | Manns' Atp, Inc. | Potwin, KS 67123 | Oil Operator | Jun 2025 |
| 60 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 61 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 62 | Mapco Prod Compa | | Gas Operator | Dec 1984 |
| 63 | Maple Leaf Energ | | Oil & Gas Operator | Sep 1989 |
| 64 | Mapleton Gas Pipeline, Inc. | Mapleton, KS 66754 | Gas Operator | Jun 2011 |
| 65 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Sep 2025 |
| 66 | Marathon Oil Co.-Rocky Mountain Region | Cody, WY 82414 | Oil Operator | Dec 1999 |
| 67 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 68 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 69 | Marco Oil Compan | | Oil & Gas Operator | Aug 1992 |
| 70 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Nov 2025 |
| 71 | Marco Production | | Oil & Gas Operator | Apr 1986 |
| 72 | Marden Producing | | Gas Operator | Aug 1990 |
| 73 | Marden Producing Company | Edmond, OK 73083 | Gas Operator | Sep 2025 |
| 74 | Marexco | | Oil & Gas Operator | Nov 1994 |
| 75 | Marexco, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Sep 2025 |
| 76 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 77 | Mariah Operating Company, LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2009 |
| 78 | Marjo Incorporat | | Oil & Gas Operator | Jun 1990 |
| 79 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 80 | Mark Oil, Inc. | Chanute, KS 66720 | Oil Operator | Feb 2025 |
| 81 | Markan Oil Incor | | Oil Operator | Mar 1991 |
| 82 | Marker Oil Compa | | Oil Operator | Jul 1985 |
| 83 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 2025 |
| 84 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 85 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |
| 86 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 87 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 88 | Marrs Richard L | | Gas Operator | Apr 1990 |
| 89 | Marrs, Richard L.(Deceased) | Arkansas City, KS 67005 | Oil & Gas Operator | Feb 2013 |
| 90 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Sep 2025 |
| 91 | Marsh Tom F Inco | | Gas Operator | Jun 1987 |
| 92 | Marshall Lew L O | | Oil Operator | Jun 1994 |
| 93 | Marshall Oil LLC | Eureka, KS 67045 | Oil Operator | Sep 2025 |
| 94 | Marshel Inv | | Oil Operator | Oct 1991 |
| 95 | Martec Petroleum | | Oil Operator | Jan 1984 |
| 96 | Martin J S Oil O | | Oil & Gas Operator | Apr 1991 |
| 97 | Martin Oil LLC | Madison, KS 66860 | Oil Operator | Sep 2025 |
| 98 | Martin Oil Produ | | Oil & Gas Operator | Dec 1994 |
| 99 | Martin Oil Producers, Inc. | Garland, TX 75046 | Oil & Gas Operator | Aug 2013 |
| 100 | Martin Oil Properties | | Oil Operator | Dec 2009 |