| 101 | Genecov Group, Inc. The | Tyler, TX 75713 | Oil & Gas Operator | Dec 2002 |
| 102 | Geo Co., Inc. | Austin, TX 78745 | Oil Operator | Apr 1988 |
| 103 | Geonatural Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 104 | Gill Oil Company, LP | White Oak, TX 75693 | Oil Operator | Mar 2025 |
| 105 | Global Oil Corp | Rising Star, TX 76471 | Oil Operator | Apr 2008 |
| 106 | Goldsmith, J. Paul | Tyler, TX 75711 | Oil & Gas Operator | Feb 1997 |
| 107 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Mar 2025 |
| 108 | Grant Resources, LLC | Ennis, TX 75120 | Oil Operator | Mar 2025 |
| 109 | Guffey, Roy, Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2011 |
| 110 | Gulf States Petro. Corp. | Dallas, TX 75202 | Oil & Gas Operator | Apr 2006 |
| 111 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 112 | Haber Resources Corporation | Houston, TX 77063 | Oil & Gas Operator | Mar 1999 |
| 113 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 114 | Hawthorn Energy Partners, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 115 | Haynie Drilling Co. Inc. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 2011 |
| 116 | Haynie Energy Services LLC | Wortham, TX 76693 | Oil Operator | Mar 2025 |
| 117 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2025 |
| 118 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 119 | Hombre Oil Co., LTD. | Tyler, TX 75713 | Oil & Gas Operator | Apr 2021 |
| 120 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 121 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 122 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 123 | Hydrogeo Energy, LLC | Houston, TX 77074 | Oil Operator | Mar 2025 |
| 124 | Hydrogeo, L.L.C. | Houston, TX 77074 | Oil & Gas Operator | Mar 2025 |
| 125 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 126 | Ironwood Oil & Gas LLC | Houston, TX 77067 | Oil & Gas Operator | Jun 2014 |
| 127 | Iskandia Energy Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 128 | Jackson Oil | Powell, TX 75153 | Oil & Gas Operator | Mar 2025 |
| 129 | Jacobi-Johnson Energy, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 1998 |
| 130 | Jla Resources Company | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 131 | Juna Operating Co. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 1996 |
| 132 | Juna Operating, Inc. | Corsicana, TX 75151 | Oil & Gas Operator | Nov 2008 |
| 133 | K & K Oil Co. | Corsicana, TX 75109 | Oil & Gas Operator | Mar 2025 |
| 134 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 135 | Kathler Oil Interests | Frisco, TX 75034 | Oil & Gas Operator | Mar 2025 |
| 136 | Kent, Charles Operating Co. Inc. | Powell, TX 75153 | Oil & Gas Operator | Dec 2007 |
| 137 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2024 |
| 138 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Mar 2025 |
| 139 | Klock, Ted | Corsicana, TX 75110 | Oil Operator | Jul 2022 |
| 140 | Ko Operating LLC | Plano, TX 75025 | Oil Operator | Mar 2025 |
| 141 | Koch Midstream Services Company | Wichita, KS 67201 | Oil & Gas Operator | Oct 2000 |
| 142 | Lacy, F. B. Inc. | Houston, TX 77055 | Oil & Gas Operator | Sep 1997 |
| 143 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 144 | Lanco Oil & Gas, Inc. | Richland, TX 76681 | Oil & Gas Operator | Jan 1998 |
| 145 | Lane, Lloyd L. | Buffalo, TX 75831 | Oil Operator | Mar 2025 |
| 146 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 147 | Last Chance Operating LLC | Wortham, TX 76693 | Oil Operator | Mar 2025 |
| 148 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 149 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 150 | Lennon Oil Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2008 |
| 151 | Leopard, Glenn | Malakoff, TX 75148 | Oil & Gas Operator | Aug 2003 |
| 152 | Locin Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 153 | Long Operating, L.L.C. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2006 |
| 154 | Longbotham Energy, LLC | Jackson, TN 38308 | Oil Operator | Mar 2025 |
| 155 | Lotus O&G, LLC | Mansfield, TX 76063 | Oil Operator | Mar 2025 |
| 156 | M V Purchasing LLC | Wichita, KS 67202 | Oil & Gas Operator | Dec 2024 |
| 157 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Mar 2025 |
| 158 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 159 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 160 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 161 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 162 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 163 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Mar 2025 |
| 164 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 165 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 166 | McBrayer Oil Corporation | Rockport, TX 78381 | Oil & Gas Operator | Nov 1994 |
| 167 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 168 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |
| 169 | Means Oil Company, LLC | Corsicana, TX 75110 | Oil & Gas Operator | Mar 2025 |
| 170 | Means, Frank L. | Corsicana, TX 75110 | Oil & Gas Operator | Jan 2001 |
| 171 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 172 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 173 | Micro Operating, Inc. | Bryan, TX 77807 | Oil & Gas Operator | Mar 2025 |
| 174 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 175 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 176 | Miller Oil Company | Corsicana, TX 75110 | Oil & Gas Operator | Dec 2015 |
| 177 | Miller Production Co. | Tyler, TX 75701 | Oil & Gas Operator | Mar 2025 |
| 178 | Miller, B. H. Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Sep 2002 |
| 179 | Miller, C. R. Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Mar 2025 |
| 180 | Miller, Cecil G. | Corsicana, TX 75110 | Oil & Gas Operator | Jan 2023 |
| 181 | Miller, Cecil G. Estate Of | Corsicana, TX 75110 | Oil Operator | Mar 2025 |
| 182 | Miller, Mike | Corsicana, TX 75110 | Oil & Gas Operator | Mar 2025 |
| 183 | Miller, Mike / Miller Prod. Co. | Corsicana, TX 75110 | Oil & Gas Operator | Mar 2025 |
| 184 | Mixon, Robert N. | Lometa, TX 76853 | Oil & Gas Operator | Mar 2025 |
| 185 | MLB Operating Services, LLC | Tenn Colony, TX 75861 | Oil & Gas Operator | Mar 2025 |
| 186 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 187 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Mar 2025 |
| 188 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 189 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 190 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Mar 2025 |
| 191 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2024 |
| 192 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Nov 2024 |
| 193 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 194 | Navidad Resources, LLC | Bullard, TX 75757 | Oil & Gas Operator | Mar 2025 |
| 195 | New Horizon Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2006 |
| 196 | NFR Energy, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2017 |
| 197 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 198 | Noram Operating Company | Houston, TX 77002 | Oil Operator | Oct 1999 |
| 199 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 200 | Northamerican Service Group | Katy, TX 77449 | Oil & Gas Operator | Mar 2025 |