| 101 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 102 | Lyon Energy, Inc. | Plano, TX 75075 | Oil & Gas Operator | Feb 2000 |
| 103 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 104 | Marshall, Sam | Granbury, TX 76048 | Oil & Gas Operator | Aug 2010 |
| 105 | Marshall, Samuel Meek, Estate Of | Granbury, TX 76048 | Oil & Gas Operator | Dec 2025 |
| 106 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 107 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2025 |
| 108 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 109 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 110 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 111 | Miller Operating Company LLC | Lafayette, LA 70598 | Oil & Gas Operator | Dec 2025 |
| 112 | Mills, Jay | Stephenville, TX 76401 | Gas Operator | Apr 2022 |
| 113 | Mingus Oil & Gas | Mingus, TX 76463 | Oil & Gas Operator | Dec 2025 |
| 114 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 115 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 116 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Dec 2025 |
| 117 | Morris R. Greenhaw Oil&Gas, Inc | Desdemona, TX 76445 | Oil & Gas Operator | Dec 2025 |
| 118 | Mosaic Oil LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 119 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 120 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 121 | North Ridge Corporation | Duncanville, TX 75137 | Oil & Gas Operator | Dec 2025 |
| 122 | North Texas Plugging, LLC | Denton, TX 76205 | Oil & Gas Operator | Dec 2025 |
| 123 | Novo Exploration Corporation | Hurst, TX 76053 | Oil & Gas Operator | Jun 2020 |
| 124 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 125 | Oakridge Oil And Gas, LP | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 126 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 127 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 128 | Owl Creek Operating Co., Inc. | Denver, CO 80206 | Oil & Gas Operator | Dec 2025 |
| 129 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 130 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 131 | Pack-Man Energy Company | Ranger, TX 76470 | Oil & Gas Operator | Nov 2005 |
| 132 | Palmigo Oil Co. | West Hills, CA 91308 | Oil & Gas Operator | Oct 2017 |
| 133 | Pardue Energy Inc. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2015 |
| 134 | Parker Operating Co., Inc. | Aledo, TX 76008 | Oil & Gas Operator | Sep 2000 |
| 135 | PDC Energy | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 136 | PDC-WV-Co Corporation | Denver, CO 80203 | Oil & Gas Operator | Aug 2010 |
| 137 | Pendragon Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2025 |
| 138 | Petrocoastal, Inc. | Frisco, TX 75036 | Oil & Gas Operator | Dec 2025 |
| 139 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 140 | Pintex Operating Inc. | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Feb 2005 |
| 141 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 142 | Porter, E. J. | Mingus, TX 76463 | Gas Operator | Jan 2011 |
| 143 | Precision Operating Inc. | Richardson, TX 75080 | Oil & Gas Operator | Jul 2014 |
| 144 | Premier Natural Resources II,LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2015 |
| 145 | Prime Operating | Queen City, TX 75572 | Oil & Gas Operator | Apr 2005 |
| 146 | Principal Oil Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2002 |
| 147 | Pryor Petroleum Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 148 | Quality Petroleum, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jan 2022 |
| 149 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 150 | R.P.Wilson, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Jan 2011 |
| 151 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 152 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 153 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Dec 2025 |
| 154 | Rendova Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2002 |
| 155 | Rhodes Drilling Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2000 |
| 156 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 157 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Dec 2025 |
| 158 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 159 | Rimrock Energy, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2012 |
| 160 | Rock Petroleum, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2024 |
| 161 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Dec 2025 |
| 162 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 163 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 164 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 165 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 166 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 167 | Scranton Exploration | Eastland, TX 76448 | Oil & Gas Operator | Dec 2025 |
| 168 | Serendipity Exploration, Inc. | Weatherford, TX 76087 | Gas Operator | May 1997 |
| 169 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 170 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2025 |
| 171 | Shaw, T. G. Oil Company, LTD. | Fort Worth, TX 76113 | Oil & Gas Operator | Dec 2025 |
| 172 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 173 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 174 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Dec 2025 |
| 175 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 176 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 177 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 178 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 179 | Square One Energy, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Oct 2015 |
| 180 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 181 | Stellex | De Leon, TX 76444 | Oil & Gas Operator | Dec 2025 |
| 182 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 183 | Stewart & Porter | Mingus, TX 76463 | Oil & Gas Operator | Apr 2002 |
| 184 | Stewart Contract Services | Strawn, TX 76475 | Oil & Gas Operator | Dec 2025 |
| 185 | Stewart Oil & Gas | Stephenville, TX 76401 | Gas Operator | Dec 2025 |
| 186 | Stonebriar Oil LLC | Frisco, TX 75034 | Oil & Gas Operator | Dec 2025 |
| 187 | Sun-Key Oil Co., Inc. | Dublin, TX 76446 | Oil & Gas Operator | Dec 2025 |
| 188 | Swaim, Charles | Tolar, TX 76476 | Oil & Gas Operator | Apr 2020 |
| 189 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2025 |
| 190 | Talon Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 191 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 192 | Tarpon Oil Company | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2016 |
| 193 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2025 |
| 194 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Dec 2025 |
| 195 | Three B Corporation | Fort Worth, TX 76179 | Gas Operator | Jun 2009 |
| 196 | Three B, LP | Fort Worth, TX 76179 | Gas Operator | Dec 2025 |
| 197 | Torch Operating LLC | Fort Worth, TX 76135 | Oil & Gas Operator | Oct 2020 |
| 198 | Tower Resources Inc | Conroe, TX 77304 | Oil & Gas Operator | Dec 2025 |
| 199 | Tres Azores Oil & Gas, Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 2003 |
| 200 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |