| 101 | Oso Exploration Co. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2011 |
| 102 | P.S.N. Petroleum, Inc. | San Antonio, TX 78233 | Oil & Gas Operator | Jul 2025 |
| 103 | Pantex Oil & Gas LLC | Ranger, TX 76470 | Oil & Gas Operator | Jul 2018 |
| 104 | Patterson Energy Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jul 2025 |
| 105 | Phillips, Jack L. Co. | Gladewater, TX 75647 | Oil & Gas Operator | Jul 2025 |
| 106 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 107 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 108 | Producers Engineering Company | Destin, FL 32541 | Oil & Gas Operator | Sep 1999 |
| 109 | Protege Energy III LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 110 | Quatro Oil And Gas, Inc. | Joshua, TX 76058 | Oil & Gas Operator | Jul 2025 |
| 111 | Quemado Energy, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 112 | Red Arrow Energy, LLC | Houston, TX 77027 | Oil & Gas Operator | Jul 2016 |
| 113 | Redemption Oil & Gas, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2024 |
| 114 | Regency Energy, Inc. | Crystal City, TX 78839 | Oil & Gas Operator | Jul 2025 |
| 115 | Resource Expl & Prod, Inc. | Salado, TX 76571 | Oil & Gas Operator | Jul 2025 |
| 116 | Rio Grand Exploration, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2025 |
| 117 | Robin, Jack, Co. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Dec 2017 |
| 118 | Rockport Georgetown Holdings,LP | Bellaire, TX 77401 | Oil & Gas Operator | Nov 2007 |
| 119 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 120 | Sabine Pipe & Supply Co. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2004 |
| 121 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 122 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 123 | Saxet Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 124 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 125 | Shaw, T. G. Oil Company, LTD. | Fort Worth, TX 76113 | Oil & Gas Operator | Jul 2025 |
| 126 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Jul 2025 |
| 127 | SN Ef Maverick, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2023 |
| 128 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 129 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 130 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 131 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | Jul 2025 |
| 132 | Stonegate Operators, Inc. | Addison, TX 75001 | Oil Operator | Jul 2025 |
| 133 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 134 | Tesoro Expl. & Prod. Company | San Antonio, TX 78216 | Gas Operator | Sep 2010 |
| 135 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Jul 2025 |
| 136 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | Jul 2025 |
| 137 | Texokan Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 138 | Thalmann Oil Field Service, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2008 |
| 139 | Thalmann, David Vac Service Inc | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Jul 2025 |
| 140 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Jul 2025 |
| 141 | Tidelands Gas Corporation | Flower Mound, TX 75028 | Oil & Gas Operator | Sep 2000 |
| 142 | Tidelands Oil Corporation | Crystal City, TX 78839 | Oil & Gas Operator | Aug 2003 |
| 143 | Touchstone Resources USA, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2006 |
| 144 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 145 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | Jul 2025 |
| 146 | United Texas Petroleum Inc. | McKinney, TX 75070 | Oil & Gas Operator | Jul 2025 |
| 147 | Vision Stone Petroleum, LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 148 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 149 | Western Pride Resources, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2011 |
| 150 | Wilbanks, Bruce A. Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 151 | Williamson Operating Co. | Uvalde, TX 78801 | Oil & Gas Operator | Jul 2025 |
| 152 | Williamson, J. C. | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 153 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 154 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 155 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |