| 7001 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 7002 | Meeker & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 7003 | Meeker, Dan Management, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 2007 |
| 7004 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 7005 | Megargel Drilling Company | Megargel, TX 76370 | Oil Operator | Nov 1998 |
| 7006 | Megg, L.P. | Borger, TX 79008 | Oil & Gas Operator | Apr 2026 |
| 7007 | Mego Resources, LLC | Taft, TX 78390 | Oil & Gas Operator | Apr 2026 |
| 7008 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Apr 2026 |
| 7009 | Mei Operating Company | Lafayette, LA 70598 | Oil & Gas Operator | Aug 1997 |
| 7010 | Melcar Production | Tuscola, TX 79562 | Oil & Gas Operator | Apr 2026 |
| 7011 | Mello-Dy Resources, LLC | Devine, TX 78016 | Oil Operator | Apr 2026 |
| 7012 | Mellon Creek Operating Co. | Victoria, TX 77901 | Oil & Gas Operator | Jun 1993 |
| 7013 | Mellon Oil Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 7014 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 7015 | Melton Operating Co. | Friendswood, TX 77546 | Oil & Gas Operator | Jul 2005 |
| 7016 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 7017 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 7018 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 7019 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 7020 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 7021 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | Apr 2026 |
| 7022 | Mercantile Oil & Gas Prod. Corp. | Galena Park, TX 77547 | Oil & Gas Operator | Jun 2016 |
| 7023 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 7024 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Apr 2026 |
| 7025 | Mereken Energy Corp. | Fort Worth, TX 76102 | Gas Operator | Feb 2006 |
| 7026 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 7027 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 7028 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 7029 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 7030 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 7031 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 7032 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 7033 | Meridian Resource & Expl Co, The | Houston, TX 77077 | Oil & Gas Operator | Dec 2000 |
| 7034 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 7035 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 7036 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 7037 | Merit Energy Company, LLC | Dallas, TX 75009 | Oil & Gas Operator | Dec 2025 |
| 7038 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 7039 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 7040 | Merkaz Drilling, LLC | Dallas, TX 75229 | Oil Operator | Apr 2026 |
| 7041 | Merkin LLC | Austin, TX 78737 | Oil Operator | Apr 2026 |
| 7042 | Merlon Texas, Inc. | Houston, TX 77056 | Oil Operator | Jun 2013 |
| 7043 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |
| 7044 | Merrill Operating, LLC | Snyder, TX 79550 | Oil Operator | Apr 2016 |
| 7045 | Merrimac Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 7046 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Feb 2026 |
| 7047 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Apr 2026 |
| 7048 | Merritt, William Kevin | Dallas, TX 75225 | Oil & Gas Operator | Dec 1994 |
| 7049 | Merta, Mike | Alice, TX 78333 | Oil & Gas Operator | Aug 2005 |
| 7050 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2025 |
| 7051 | Merzbacher, George F. Jr. | Robstown, TX 78380 | Oil & Gas Operator | May 1994 |
| 7052 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 7053 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 7054 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 7055 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 7056 | Mesa Ridge Holdings LLC | Abilene, TX 79603 | Oil Operator | Apr 2026 |
| 7057 | Mesa VIsta Operating, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 7058 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 7059 | Mesquite Land & Minerals Co. | Albany, TX 76430 | Oil Operator | Apr 2026 |
| 7060 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 7061 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Apr 2026 |
| 7062 | Messer Helium Cliffside LLC | Bridgewater, NJ 08807 | Gas Operator | Apr 2026 |
| 7063 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | Apr 2026 |
| 7064 | Mestena Operating, L.L.C. | Corpus Christ, TX 78401 | Oil & Gas Operator | Aug 2015 |
| 7065 | Mestena Operating, LTD. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jun 2009 |
| 7066 | Mestena, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Nov 2001 |
| 7067 | Metano Energy III, LP | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2026 |
| 7068 | Metano Energy, LP | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2008 |
| 7069 | Metco Oil Corporation | Seguin, TX 78155 | Oil Operator | Apr 2016 |
| 7070 | Metis Energy LLC | Houston, TX 77019 | Oil & Gas Operator | Jan 2026 |
| 7071 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 7072 | Metroplex Barnett Shale LLC | Houston, TX 77001 | Gas Operator | Sep 2008 |
| 7073 | Metzner, Norma J. Estate | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1998 |
| 7074 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Apr 2026 |
| 7075 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 7076 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Apr 2026 |
| 7077 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Feb 2026 |
| 7078 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | Jan 2026 |
| 7079 | MFP Petroleum LTD. Partnership | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2017 |
| 7080 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jan 2026 |
| 7081 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 7082 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 7083 | MGM Oil & Gas Inc. | Ballinger, TX 76821 | Oil & Gas Operator | Apr 2026 |
| 7084 | MGM Well Service, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2004 |
| 7085 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 7086 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Apr 2026 |
| 7087 | Mi-Co Oil & Gas LLC | Caddo, TX 76429 | Oil Operator | Apr 2026 |
| 7088 | Michael Petr. & Hurd Ent., LTD. | Houston, TX 77056 | Oil & Gas Operator | Oct 1993 |
| 7089 | Michael Petroleum Corporation | Houston, TX 77040 | Oil & Gas Operator | Dec 2001 |
| 7090 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2026 |
| 7091 | Micro Operating, Inc. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2026 |
| 7092 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2026 |
| 7093 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 7094 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 7095 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 7096 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 7097 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 7098 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Apr 2026 |
| 7099 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 7100 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |