| 2001 | Monroe Well Service-York | | Oil Operator | Dec 1988 |
| 2002 | Monroe, Cameron | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 2003 | Monsanto | Englewood, CO 80111 | Oil & Gas Operator | Apr 1986 |
| 2004 | Monsanto Company | Indianapolis, IN 46280 | Oil & Gas Operator | Jan 2005 |
| 2005 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 2006 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 2007 | Mont-Land Co. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 2008 | Montalban Oil & Gas Operations, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2025 |
| 2009 | Montana Energy Company, LLC | McAllen, TX 78501 | Oil & Gas Operator | May 2025 |
| 2010 | Montana Heartland LLC | Bismarck, ND 58504 | Oil & Gas Operator | Aug 2025 |
| 2011 | Montana Land & Exploration, Inc. | Calgary, AB T2P 3E7 | Oil & Gas Operator | Apr 2019 |
| 2012 | Montana Land & Mineral Co. | Billings, MT 59105 | Gas Operator | Jun 2025 |
| 2013 | Montana Oil Field Acquisition I, LLC | Rutherford, NJ 07070 | Oil Operator | Jun 2016 |
| 2014 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 2015 | Montana Power Gas Company | | Oil & Gas Operator | Apr 2002 |
| 2016 | Montare Operating, LTD. | Flower Mound, TX 75022 | Oil & Gas Operator | Dec 2025 |
| 2017 | Montclair Energy LLC | Edmond, OK 73034-7291 | Oil & Gas Operator | Sep 2025 |
| 2018 | Montclair Production Company | Austin, TX 78755 | Oil & Gas Operator | Dec 2025 |
| 2019 | Montco Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 1999 |
| 2020 | Monte Grande Exploration, Inc. | Cut Bank, MT 59427 | Oil Operator | Oct 2000 |
| 2021 | Montego Resources Inc | Oklahoma City, OK 73172-0192 | Oil & Gas Operator | Mar 2015 |
| 2022 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 2023 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 2024 | Monterey Resources Inc. | | Oil & Gas Operator | Dec 1997 |
| 2025 | Monterey Resources LLC | Dallas, TX 75230 | Oil & Gas Operator | Oct 2019 |
| 2026 | Montex Drilling Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 2027 | Montex Exploration | Sugarland, TX 77478 | Oil Operator | Apr 2003 |
| 2028 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 2029 | Montgomery Count | | Oil Operator | Dec 1992 |
| 2030 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Sep 2025 |
| 2031 | Montgomery Jake E | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 2032 | Montgomery Oil & Gas Expl Inc | Tulsa, OK 74170-1884 | Oil & Gas Operator | Mar 2005 |
| 2033 | Montgomery Oil Co | | Oil Operator | Dec 2018 |
| 2034 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 2035 | Montgomery Production & Operating LLC | Herington, KS 67449 | Oil & Gas Operator | Jun 2025 |
| 2036 | Montgomery Royalty | Moran, TX 76464 | Oil & Gas Operator | Dec 2025 |
| 2037 | Montrose Operating LLC | Broken Arrow, OK 74012 | Oil & Gas Operator | Dec 2025 |
| 2038 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Aug 2025 |
| 2039 | Monument Gas Marketing Inc | | Oil & Gas Operator | Sep 2025 |
| 2040 | Monument Global Resources Inc | Dallas, TX 75243 | Oil & Gas Operator | Jan 2025 |
| 2041 | Monument Production Inc. | | Oil & Gas Operator | Dec 2011 |
| 2042 | Monument Resources, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Jun 2012 |
| 2043 | Moody Energy Co. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2004 |
| 2044 | Moody Oil & Gas Co. | Bridgeport, WV 26330-1051 | Oil & Gas Operator | Dec 2004 |
| 2045 | Moody Oil Co. | Pearsall, TX 78061 | Oil & Gas Operator | Dec 2025 |
| 2046 | Moody Oil LLC | Henderson, KY 42420 | Oil Operator | Dec 2022 |
| 2047 | Moog Incorporated | Elma, NY 14059 | Gas Operator | Dec 2024 |
| 2048 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 2049 | Moon-Hines-Tigrett Operating Co., Inc. | | Oil & Gas Operator | Sep 2025 |
| 2050 | Moon-Hines-Tigrett Opr Co Inc | | Oil & Gas Operator | Oct 1995 |
| 2051 | Moonlite Oil & Gas Company | Imperial, TX 79743 | Oil & Gas Operator | Dec 2025 |
| 2052 | Moontower Resources Op, LLC | Austin, TX 78732 | Oil & Gas Operator | Apr 2025 |
| 2053 | Moore & Associates | Denver, CO 80202 | Oil & Gas Operator | Dec 1993 |
| 2054 | Moore & Gilmore | Midland, TX 79701 | Oil & Gas Operator | Oct 2008 |
| 2055 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 2056 | Moore Clay | Bradenton, FL 34211 | Oil & Gas Operator | Aug 2025 |
| 2057 | Moore County Gas Partners, L.P. | Borger, TX 79007 | Gas Operator | Dec 2025 |
| 2058 | Moore David K | Duncan, OK 73575 | Oil & Gas Operator | Oct 2009 |
| 2059 | Moore Don | Elmore City, OK 73433 | Oil & Gas Operator | Aug 2025 |
| 2060 | Moore DRLG LLC | MT Vernon, OH 43050 | Oil Operator | Dec 2024 |
| 2061 | Moore Energy Services, LLC | Iowa Park, TX 76367 | Oil Operator | Mar 2024 |
| 2062 | Moore Gas And Oil | Monahans, TX 79756 | Oil Operator | Dec 2025 |
| 2063 | Moore Investment Co. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 2064 | Moore Investments LC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Feb 2023 |
| 2065 | Moore Lynn D | Collinsville, OK 74021 | Oil Operator | Aug 2013 |
| 2066 | Moore McCormack Energy, Inc. | | Oil & Gas Operator | Jul 1988 |
| 2067 | Moore Michael | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2013 |
| 2068 | Moore Oil & Gas-Marion Corp. | | Oil & Gas Operator | Nov 1986 |
| 2069 | Moore Oil And Gas | Burleson, TX 76028 | Oil & Gas Operator | Dec 2025 |
| 2070 | Moore Petroleum Invest Corp | Norman, OK 73072-4217 | Oil & Gas Operator | Aug 2025 |
| 2071 | Moore Resources LLC | Mogadore, OH 44260 | Oil & Gas Operator | Dec 2024 |
| 2072 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 2073 | Moore Robert L | Perryton, TX 79070-1275 | Oil & Gas Operator | Apr 2020 |
| 2074 | Moore Tommy M | Sapulpa, OK 74066-8273 | Oil & Gas Operator | May 2013 |
| 2075 | Moore W T | Sapulpa, OK 74067-0946 | Oil & Gas Operator | Jan 2021 |
| 2076 | Moore Well Services Inc | Mogadore, OH 44260 | Oil & Gas Operator | Dec 2024 |
| 2077 | Moore&Munger Hydrocarbons Inc | | Oil Operator | May 1987 |
| 2078 | Moore, Brent L. | McPherson, KS 67460 | Oil Operator | Dec 1996 |
| 2079 | Moore, Clay (Deceased) | Dallas, TX 75218 | Oil Operator | Sep 2001 |
| 2080 | Moore, Douglas L. | Gridley, KS 66852 | Oil Operator | Jan 2019 |
| 2081 | Moore, J.W. Oil Co | Llano, TX 78643 | Oil Operator | Dec 2025 |
| 2082 | Moore, John D. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 2083 | Moore, Kirby | Ozona, TX 76943 | Oil & Gas Operator | Jul 1996 |
| 2084 | Moore, Mark C. | Darien Center, NY 14040 | Gas Operator | Dec 2024 |
| 2085 | Moore, Miles Inc. | Moran, TX 76464 | Oil & Gas Operator | Dec 2025 |
| 2086 | Moore, Stephen Operating | Graham, TX 76450 | Oil & Gas Operator | Jun 2002 |
| 2087 | Mooringsport Energy Prod Corp | | Oil & Gas Operator | Oct 1994 |
| 2088 | Mooringsport Energy Prod. Co. | Shreveport, LA 71162 | Oil & Gas Operator | Dec 2025 |
| 2089 | Mooringsport Energy Trans Corp | | Oil Operator | Apr 1990 |
| 2090 | Moose Mountain Divide #1, LLC | Roosevelt, UT 84066-1656 | Oil & Gas Operator | Oct 2025 |
| 2091 | Moose Oil & Gas Co. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 2092 | Moose Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Dec 2025 |
| 2093 | Mor-Co Investments, Inc. | | Gas Operator | Feb 1994 |
| 2094 | Mor-Meg Incorpor | | Oil Operator | Dec 1996 |
| 2095 | Morain Coating & Construc | Niles, OH 44446 | Oil & Gas Operator | Dec 1997 |
| 2096 | Moran Exploration, Inc. | | Oil & Gas Operator | Jan 1985 |
| 2097 | Moran James R | Frazeysburg, OH 43822 | Oil Operator | Dec 2017 |
| 2098 | Moran Oil Co., Inc. | | Oil & Gas Operator | Aug 2009 |
| 2099 | Moran Oil Enterp | | Gas Operator | Apr 1989 |
| 2100 | Moran Oil Enterprises LLC | Seminole, OK 74818 | Oil & Gas Operator | Dec 2019 |