| 101 | Small, R.P. Corp. | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 102 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | May 2025 |
| 103 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | May 2025 |
| 104 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 105 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 106 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | May 2025 |
| 107 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 108 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 109 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 110 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 111 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | May 2025 |
| 112 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 113 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2025 |
| 114 | Uosi Operating, Inc. | Lovelady, TX 75851 | Oil & Gas Operator | May 2025 |
| 115 | Upland Operating, LLC | Dallas, TX 75226 | Oil & Gas Operator | May 2025 |
| 116 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | May 2025 |
| 117 | Vistatex Energy LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 118 | Vondra Energy Corp. | Alvin, TX 77512 | Oil & Gas Operator | May 2025 |
| 119 | VT VIstatex Energy LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 120 | W. R. G. Oil & Gas, Inc. | Arlington, TX 76013 | Oil & Gas Operator | Dec 1993 |
| 121 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 122 | Well-Co Solutions, LLC | Batson, TX 77519 | Oil Operator | May 2025 |
| 123 | Wheeler Operating Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | May 2025 |
| 124 | Whitson, James A., Jr. | Houston, TX 77063 | Oil & Gas Operator | Nov 2011 |
| 125 | Wilson Oil Co. | Houston, TX 77263 | Oil & Gas Operator | May 2025 |
| 126 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 127 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |