| 301 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 302 | Socorro Exploration, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | May 2026 |
| 303 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2026 |
| 304 | Spicewood Operating Company, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2026 |
| 305 | Sproul, C. R. Inc. | Eldorado, TX 76936 | Oil & Gas Operator | Aug 2000 |
| 306 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | May 2026 |
| 307 | Stanolind Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2021 |
| 308 | Stanolind Permian LLC | Midland, TX 79710 | Oil & Gas Operator | May 2026 |
| 309 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 310 | Suborp Energy, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Sep 2000 |
| 311 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 312 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 313 | Tabula Rasa Energy, LLC | Allen, TX 75013 | Oil & Gas Operator | Dec 2020 |
| 314 | Tacoma Operating LLC | Midland, TX 79707 | Oil & Gas Operator | May 2026 |
| 315 | Tacor Resources Inc | Midland, TX 79705 | Oil & Gas Operator | May 2026 |
| 316 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | May 2026 |
| 317 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2026 |
| 318 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 319 | Taylor, J. S. Inc. | Lewisville, TX 75057 | Oil & Gas Operator | May 2026 |
| 320 | TC Energy LLC | Covington, OK 73730-2116 | Oil & Gas Operator | Sep 2014 |
| 321 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2026 |
| 322 | Tejas Operators, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 323 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | May 2026 |
| 324 | Texas Rayco Inc. | Palmetto, FL 34221 | Oil & Gas Operator | May 2026 |
| 325 | Texland Petroleum Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2003 |
| 326 | Texland Petroleum, L.P. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2026 |
| 327 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 328 | Texon Oil Company, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2023 |
| 329 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 330 | Three Forks Resources, LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | May 2026 |
| 331 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2026 |
| 332 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 333 | Trail Mountain, Inc. | Artesia, NM 88210 | Oil & Gas Operator | Jan 2016 |
| 334 | Trinity Eor, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2019 |
| 335 | Tripp & Sons, LLC | Odessa, TX 79768 | Oil & Gas Operator | May 2026 |
| 336 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 337 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 338 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 339 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 340 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2026 |
| 341 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | May 2026 |
| 342 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 343 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | May 2026 |
| 344 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 345 | Vanguard Permian, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 346 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 347 | Voskamp Exploration, Inc. | Midland, TX 79708 | Oil & Gas Operator | Sep 2010 |
| 348 | W&T Offshore, Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2026 |
| 349 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 350 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | May 2026 |
| 351 | Walsh Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2022 |
| 352 | West Bay Exploration Company | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 353 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 354 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 355 | Wheeler Operating Corporation | Fort Worth, TX 76109 | Oil & Gas Operator | May 2026 |
| 356 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | May 2026 |
| 357 | White Stride LLC | Piedmont, OK 73078 | Oil & Gas Operator | May 2026 |
| 358 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 359 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 360 | Wilson Operating Service Inc | Brownfield, TX 79316 | Oil & Gas Operator | Aug 2003 |
| 361 | Wilson, Don H., Inc. | Elkhart, TX 75839 | Oil & Gas Operator | May 2019 |
| 362 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 363 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 364 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 365 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2026 |
| 366 | Yates Industries, LLC | Santa Fe, NM 87501 | Oil & Gas Operator | Mar 2026 |
| 367 | Yates, Harvey E. Company | Roswell, NM 88201 | Oil & Gas Operator | Dec 2002 |
| 368 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 369 | Yucca Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2026 |