| 20001 | Musgrove Petrole | | Oil & Gas Operator | Dec 1996 |
| 20002 | Musgrove Produci | | Oil Operator | May 1989 |
| 20003 | Musgrove Producing | El Dorado, KS 67042 | Oil Operator | Apr 2001 |
| 20004 | Musgrove, Casey Oil | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jun 2017 |
| 20005 | Muskegon Development Co And Miller Energy Inc An | | Gas Operator | Dec 1997 |
| 20006 | Muskegon Development Company | MT Pleasant, MI 48858 | Oil & Gas Operator | Oct 2025 |
| 20007 | Muskegon Operating Company LLC | | Oil & Gas Operator | Aug 2025 |
| 20008 | Muslow And Parker | | Oil & Gas Operator | Jul 1994 |
| 20009 | Muslow Oil Industries | | Oil Operator | Jan 1995 |
| 20010 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 20011 | Mustang Drilling | | Oil & Gas Operator | Nov 1996 |
| 20012 | Mustang Drilling, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Aug 2024 |
| 20013 | Mustang Drilling, LTD. | Henderson, TX 75653 | Oil & Gas Operator | May 2008 |
| 20014 | Mustang Energy Corporation | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 20015 | Mustang Energy Inc. | Porter, TX 77365 | Oil & Gas Operator | Mar 2008 |
| 20016 | Mustang Energy L C | | Oil & Gas Operator | Jan 2013 |
| 20017 | Mustang Fuel Cor | | Oil & Gas Operator | Dec 1990 |
| 20018 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 20019 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 20020 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 20021 | Mustang Holding, LLC (Finnex) | | Oil & Gas Operator | Aug 2025 |
| 20022 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 20023 | Mustang Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2006 |
| 20024 | Mustang Resources LLC | Houston, TX 77256 | Oil & Gas Operator | Aug 2025 |
| 20025 | Mutch Harry L | | Oil & Gas Operator | Oct 1991 |
| 20026 | Mutch J O | | Gas Operator | Mar 1990 |
| 20027 | Mutch Oil And Gas Development Inc | | Oil & Gas Operator | Dec 2004 |
| 20028 | Mutschelknaus, Clarence W | Salem, WV 26426-0351 | Oil & Gas Operator | Dec 2021 |
| 20029 | Mutual Oil & Gas Co | Akron, OH 44311 | Oil & Gas Operator | Dec 2001 |
| 20030 | Mutz Oil Operator | | Oil Operator | Dec 1988 |
| 20031 | Muzyl Oil Corp | | Oil & Gas Operator | Aug 2025 |
| 20032 | MV Purchasing LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 20033 | MV2 Energy, Inc. | Houston, TX 77069 | Oil & Gas Operator | Oct 2025 |
| 20034 | MVM Resources Louisiana L.L.C. | | Oil & Gas Operator | Jan 2025 |
| 20035 | MVP Production Inc. | | Oil & Gas Operator | Apr 2005 |
| 20036 | MVRC Partnership | Russell, KS 67655 | Oil Operator | Jan 1992 |
| 20037 | MW Oil, Inc | | Oil & Gas Operator | Jun 2025 |
| 20038 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 20039 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 20040 | MWK Petroleum, LLC | Augusta, KS 67010 | Oil Operator | Jun 2025 |
| 20041 | MWL Energy LLC | Hamlin, TX 79520 | Oil Operator | Oct 2025 |
| 20042 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Oct 2025 |
| 20043 | MWWD Operator, LLC | Victoria, TX 77904 | Oil Operator | Oct 2025 |
| 20044 | MXP Operating LLC | Covington, TX 76093 | Oil & Gas Operator | Apr 2025 |
| 20045 | My Hop Mineral | Moorhead, MN 56560 | Oil & Gas Operator | Oct 2025 |
| 20046 | My Investments Too LLC | | Oil Operator | Jun 2025 |
| 20047 | Myco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2003 |
| 20048 | Myco Industries, Inc. | Artesia, NM 88211 | Oil & Gas Operator | Feb 2015 |
| 20049 | Myco Petroleum | Lovington, NM 88260 | Oil & Gas Operator | Oct 2025 |
| 20050 | Myd, Inc. | Irving, TX 75062 | Oil & Gas Operator | Mar 1998 |
| 20051 | Myers & Hicks Gas Co | | Gas Operator | Dec 2021 |
| 20052 | Myers Drilling And Exploration Inc. | Sedan, KS 67361 | Oil Operator | Aug 2022 |
| 20053 | Myers Drilling Company | Barboursville, WV 25504 | Oil & Gas Operator | Dec 2024 |
| 20054 | Myers Robert W J | | Oil Operator | Jun 1991 |
| 20055 | Myers, A. J. | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 20056 | Myers, Gus & Annie | Sedan, KS 67361 | Oil Operator | Aug 2017 |
| 20057 | Myers, James B. | Olney, TX 76374 | Oil & Gas Operator | Oct 2025 |
| 20058 | Myers, Robert L | | Oil Operator | Jun 2025 |
| 20059 | Myjo Oil Corporation | Breckenridge, TX 76024 | Oil Operator | Jul 1996 |
| 20060 | Myriad Resources Corporation | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 20061 | Mystique Developments | Denver, CO 80202 | Oil & Gas Operator | Dec 1997 |
| 20062 | Mystique Resources Company | Aurora, CO 80016 | Oil & Gas Operator | Feb 2023 |
| 20063 | Myung And Associates, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2000 |
| 20064 | MZ Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 20065 | N & B Enterprise | | Oil Operator | Nov 1994 |
| 20066 | N & B Enterprises, Inc. | Iola, KS 66749 | Oil & Gas Operator | Jun 2025 |
| 20067 | N & B Oil And Gas LLC | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 20068 | N & K Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 1998 |
| 20069 | N & N Oil | Somerset, OH 43783 | Oil & Gas Operator | Dec 2014 |
| 20070 | N & N Oil LLC | Duncan, OK 73533 | Oil & Gas Operator | May 2023 |
| 20071 | N & O Oil Co. | Imperial, TX 79743 | Oil & Gas Operator | Oct 2025 |
| 20072 | N & P Enterprises | | Oil Operator | May 1997 |
| 20073 | N & W Enterprises, Inc. | Fort Scott, KS 66701 | Oil Operator | Jun 2025 |
| 20074 | N And B Exploration, Inc. | | Oil & Gas Operator | Jun 1993 |
| 20075 | N C B Oil Company | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 20076 | N Central Casing Pullers, Inc. | | Oil & Gas Operator | May 1994 |
| 20077 | N Dale Nichols | Midland, TX 79703 | Oil & Gas Operator | Jun 2004 |
| 20078 | N Eastern Oh O&G Exp Inc | Cleveland, OH 44106 | Oil & Gas Operator | Dec 1999 |
| 20079 | N H Wheless Oil Company | Shreveport, LA 71101 | Gas Operator | Sep 2002 |
| 20080 | N S P Operating Group LLC | El Campo, TX 77437 | Oil & Gas Operator | Aug 2021 |
| 20081 | N-10 Exploration, LLC | Attica, KS 67009 | Oil & Gas Operator | Jun 2025 |
| 20082 | N-A Energy LLC | Arvada, CO 80005 | Oil Operator | Jun 2025 |
| 20083 | N-B Company Inco | | Oil & Gas Operator | Apr 1992 |
| 20084 | N. A. Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2007 |
| 20085 | N. B. Hunt | | Oil & Gas Operator | May 1981 |
| 20086 | N. E. Loomis | | Oil Operator | Oct 1986 |
| 20087 | N. E. Operating Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2013 |
| 20088 | N. J. Pardue | | Oil & Gas Operator | Jul 1994 |
| 20089 | N. R. Price | | Oil & Gas Operator | Nov 1983 |
| 20090 | N. T. Rutledge Oil Co. | | Oil Operator | Jan 1989 |
| 20091 | N. W. Corporation | | Gas Operator | Jan 1989 |
| 20092 | N.F. Producers, Inc. | Berthoud, CO 80513 | Oil Operator | Jun 2025 |
| 20093 | N.L.S., Inc. | Kimberling City, MO 65686 | Oil & Gas Operator | Aug 2016 |
| 20094 | Nabers, Lynn | Austin, TX 78751 | Gas Operator | Jul 2010 |
| 20095 | Nabob Production Company | Amarillo, TX 79105 | Gas Operator | Dec 1991 |
| 20096 | Nabors Drilling Company, Inc. | | Oil & Gas Operator | Sep 1977 |
| 20097 | Nabors Well Services LTD | Houston, TX 77067-4536 | Oil Operator | Apr 2011 |
| 20098 | Nabors-Johnson Prod Co., Inc. | | Oil & Gas Operator | Dec 2020 |
| 20099 | Nacatosh Gas Incorporated | | Oil & Gas Operator | Aug 2013 |
| 20100 | Naco Production | Midland, TX 79708 | Oil & Gas Operator | Aug 2003 |