| 101 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | May 2025 |
| 102 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 103 | RTC Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 104 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 105 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 106 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | May 2025 |
| 107 | Seashore Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | May 2025 |
| 108 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | May 2025 |
| 109 | Shamrock Oil Co. | Sugar Land, TX 77478 | Oil & Gas Operator | Mar 2008 |
| 110 | Silverbrook Operating, LLC | Barker, TX 77413 | Oil Operator | May 2025 |
| 111 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | May 2025 |
| 112 | Somerset Operating, LLC | Weatherford, TX 76086 | Gas Operator | May 2025 |
| 113 | Stanotex, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 114 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 115 | Sunray Operating Company LLC | Sugar Land, TX 77498 | Oil & Gas Operator | May 2025 |
| 116 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 117 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 118 | Talon Development Company | Boerne, TX 78006 | Oil & Gas Operator | Sep 2007 |
| 119 | Tejas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 120 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 121 | Texas-Australia Power Inc. | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2011 |
| 122 | Titan Petroleum, Inc. | Tomball, TX 77375 | Oil & Gas Operator | Nov 2004 |
| 123 | Transcontinental Minerals Corp. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2008 |
| 124 | Tres Operating Co., LLC | Katy, TX 77494 | Oil Operator | May 2025 |
| 125 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 126 | Union Gas Operating Company | Houston, TX 77014 | Oil & Gas Operator | May 2025 |
| 127 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | May 2025 |
| 128 | Viola Production Inc | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 129 | Vision Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 130 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 131 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | May 2025 |
| 132 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 133 | Wilbanks, Bruce A. Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 134 | Woodlands Oil And Gas Inc. | The Woodlands, TX 77380 | Gas Operator | Jan 2014 |
| 135 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 136 | Yentzen Investments, Inc. | Sugar Land, TX 77478 | Oil Operator | May 1993 |
| 137 | Yordes Energy, LLC | El Campo, TX 77437 | Oil Operator | May 2025 |