| 101 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 102 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | May 2025 |
| 103 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 104 | Rhyne, J.V. | Cisco, TX 76437 | Oil & Gas Operator | May 2025 |
| 105 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | May 2025 |
| 106 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 107 | Rimrock Energy, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2012 |
| 108 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 109 | Ropa Exploration Corp. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2011 |
| 110 | Routh Operating, LLC | Dallas, TX 75204 | Oil & Gas Operator | Mar 2011 |
| 111 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | May 2025 |
| 112 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 113 | Sheer Energy, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 114 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | May 2025 |
| 115 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | May 2025 |
| 116 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 117 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 118 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | May 2025 |
| 119 | Stonebriar Oil LLC | Frisco, TX 75034 | Oil & Gas Operator | May 2025 |
| 120 | Stroud Energy, LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2006 |
| 121 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 122 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 123 | Tep Barnett USA, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 124 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | May 2025 |
| 125 | Titan Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2012 |
| 126 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Feb 2025 |
| 127 | Torch Operating LLC | Fort Worth, TX 76135 | Oil & Gas Operator | Oct 2020 |
| 128 | Total E&P USA, Inc. | Houston, TX 77210 | Oil & Gas Operator | Nov 2011 |
| 129 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 130 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 131 | Tsar Operating Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jul 2021 |
| 132 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 133 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 134 | Vantage Fort Worth Energy LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Oct 2017 |
| 135 | Venado Operating Company LLC | Austin, TX 78738 | Oil & Gas Operator | Mar 2022 |
| 136 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 137 | Western Chief Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 138 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 139 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 140 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 141 | Winston Land & Cattle I, LTD. | Lufkin, TX 75902 | Oil & Gas Operator | Nov 2014 |
| 142 | WPX Energy Gulf Coast, LP | Benbrook, TX 76126 | Oil & Gas Operator | May 2012 |
| 143 | Wy Woodland Operating, LLC | Covington, TX 76636 | Oil & Gas Operator | May 2025 |
| 144 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 145 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 146 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |