| 201 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Dec 2025 |
| 202 | Questa Operating Company, LLC | Amarillo, TX 79159 | Oil & Gas Operator | Dec 2025 |
| 203 | Rabco Energy | Amarillo, TX 79120 | Oil & Gas Operator | Apr 2025 |
| 204 | Revelation Oil & Gas LLC | Dumas, TX 79029 | Oil & Gas Operator | Dec 2025 |
| 205 | Riata Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2006 |
| 206 | Richmond Petroleum Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Aug 2003 |
| 207 | Rimrock Gas Company | Weatherford, OK 73096 | Oil & Gas Operator | May 2008 |
| 208 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 209 | Romac Oil Company, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Dec 2025 |
| 210 | S & N Energies, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Jun 2002 |
| 211 | S & S Operating | Dumas, TX 79029 | Oil Operator | Dec 2025 |
| 212 | Sage Petroleum Co. | Borger, TX 79007 | Oil & Gas Operator | Dec 2002 |
| 213 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 214 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 215 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 216 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 217 | Sand Dollar, LLC | Henderson, KY 42420 | Oil & Gas Operator | Dec 2018 |
| 218 | Sargeco, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2018 |
| 219 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 220 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 221 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 222 | Shell Onshore Ventures Inc | Houston, TX 77210 | Gas Operator | Jun 2002 |
| 223 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Dec 2025 |
| 224 | SNW Operating Company | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 225 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 226 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Dec 2025 |
| 227 | Sportsman Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Nov 1998 |
| 228 | Spring Resources, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2007 |
| 229 | Stahl Petroleum Co. | Amarillo, TX 79118 | Oil & Gas Operator | Aug 2003 |
| 230 | Stallion Energy LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2009 |
| 231 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 232 | Sullivan - Wells | Amarillo, TX 79101 | Gas Operator | Dec 2025 |
| 233 | Sunlight Exploration, Inc. | Canyon, TX 79015 | Oil & Gas Operator | Dec 2025 |
| 234 | Sunray Oil Co., Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2013 |
| 235 | Sunray-Taylor, Inc. | Midland, TX 79701 | Oil & Gas Operator | Nov 1993 |
| 236 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 237 | T & R Investments, Inc. | Borger, TX 79008 | Oil & Gas Operator | Nov 1995 |
| 238 | Taylor Properties | Wichita Falls, TX 76301 | Gas Operator | Dec 2025 |
| 239 | Taylor, Gordon Oil Company | Sunray, TX 79086 | Oil & Gas Operator | Apr 1996 |
| 240 | Taylor, Gordon Oil Company, LP | Sunray, TX 79086 | Oil & Gas Operator | Feb 2014 |
| 241 | Taylor-Clayton-Hawley | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2019 |
| 242 | Terreland Corporation | Sunray, TX 79086 | Oil & Gas Operator | Oct 2004 |
| 243 | Tex-Well Oil & Gas Corp. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 244 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Dec 2025 |
| 245 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 246 | Top O'Texas Production Co. | Pampa, TX 79065 | Oil & Gas Operator | May 2024 |
| 247 | Trans Terra Corp., International | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2009 |
| 248 | Travelers Oil Company | Amarillo, TX 79102 | Oil & Gas Operator | Dec 2025 |
| 249 | Tumble Weed Production Co. | Borger, TX 79008 | Oil & Gas Operator | Dec 1994 |
| 250 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 251 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 252 | Upland Resources LLC | Canadian, TX 79014 | Oil & Gas Operator | Dec 2025 |
| 253 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 254 | VRK Oil And Gas, Inc. | Arlington, TX 76016 | Oil & Gas Operator | Mar 2014 |
| 255 | W. B. D. Oil & Gas Company | Pampa, TX 79066 | Oil & Gas Operator | Dec 1995 |
| 256 | W.B.D. Oil And Gas Inc. | Pampa, TX 79066 | Oil & Gas Operator | Oct 2019 |
| 257 | W.D. Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Oct 2001 |
| 258 | Wadi Exploration&Production,LLC | San Clemente, CA 92672 | Oil & Gas Operator | Jul 2020 |
| 259 | Walls Energy, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 260 | Westgate Petroleum, Inc. | Fritch, TX 79036 | Oil & Gas Operator | Nov 2001 |
| 261 | White Pine Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 262 | Whittington, G. R. | Amarillo, TX 79109 | Oil & Gas Operator | Jan 1994 |
| 263 | Whittington, G. R. Estate | Amarillo, TX 79109 | Oil & Gas Operator | Mar 2008 |
| 264 | Wo Operating Company | Tulsa, OK 74159 | Oil & Gas Operator | Dec 2025 |
| 265 | Wolfcamp Oil & Gas, Inc. | Odessa, TX 79764 | Oil & Gas Operator | Dec 2004 |
| 266 | X72 Operating Corp. | Plano, TX 75025 | Oil & Gas Operator | Dec 2025 |