| 301 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 302 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 303 | Spence, Ralph Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2023 |
| 304 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 305 | Staub, Larry, Inc. | Azle, TX 76020 | Oil & Gas Operator | Dec 2025 |
| 306 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 307 | Stoner Oil | Corsicana, TX 75109 | Oil Operator | Dec 2025 |
| 308 | Stratlynn, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 309 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Dec 2025 |
| 310 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 311 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 312 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2025 |
| 313 | SW Operating, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2000 |
| 314 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Nov 2025 |
| 315 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Dec 2025 |
| 316 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 317 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 318 | Teco Operating Company | Athens, TX 75751 | Oil & Gas Operator | Jun 2001 |
| 319 | Tejas Petroleum Resources, LLC | Aubrey, TX 76227 | Oil & Gas Operator | Dec 2025 |
| 320 | Tensas Delta Explo. Co., LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 321 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 322 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 323 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 324 | Texlan Oil Company, L.C. | Tyler, TX 75711 | Oil & Gas Operator | Aug 2003 |
| 325 | TGNR East Texas II LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 326 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 327 | Tracy Production | Lindale, TX 75771 | Oil & Gas Operator | Dec 2025 |
| 328 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 329 | Triple J Investments Inc | Longview, TX 75606 | Oil & Gas Operator | Feb 2023 |
| 330 | TS Oil, LLC | Fort Worth, TX 76114 | Oil & Gas Operator | Dec 2025 |
| 331 | TTK Energy LLC | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 332 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Dec 2025 |
| 333 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 334 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 335 | Uphill Consulting LLC | Pearland, TX 77584 | Oil & Gas Operator | Dec 2025 |
| 336 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 337 | Ursus Oil And Gas | Tyler, TX 75703 | Oil & Gas Operator | Dec 2025 |
| 338 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 339 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Dec 2025 |
| 340 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 341 | Ventex Operating Corp. | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 342 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 343 | Vintage Petroleum, LLC | Houston, TX 77210 | Oil & Gas Operator | Dec 2019 |
| 344 | Viola Production Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 345 | Vision Stone Petroleum, LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 346 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 347 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 348 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 349 | Walsh Resources, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 2025 |
| 350 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 351 | West Mountain Operating Co, Inc. | Longview, TX 75604 | Oil & Gas Operator | Feb 2019 |
| 352 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Dec 2025 |
| 353 | White Oak Production Company | Conway, AR 72034 | Oil & Gas Operator | Sep 2005 |
| 354 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2025 |
| 355 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2025 |
| 356 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Dec 2025 |
| 357 | Wilson Operating Service Inc | Brownfield, TX 79316 | Oil & Gas Operator | Aug 2003 |
| 358 | Wilson, Don H., Inc. | Elkhart, TX 75839 | Oil & Gas Operator | May 2019 |
| 359 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 360 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 361 | Winston Land & Cattle Co., Inc. | Lufkin, TX 75901 | Oil & Gas Operator | Feb 2001 |
| 362 | Winston Land & Cattle I, LTD. | Lufkin, TX 75902 | Oil & Gas Operator | Nov 2014 |
| 363 | Wisenbaker Production Company | Tyler, TX 75702 | Oil & Gas Operator | Oct 2011 |
| 364 | WJW Operating Co.,LLC | Austin, TX 78738 | Oil & Gas Operator | May 2002 |
| 365 | Wmo Oil, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 366 | Xta Resources LLC | Uvalde, TX 78801 | Oil & Gas Operator | Dec 2025 |
| 367 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 368 | Yarborough, W. B. | Midland, TX 79701 | Oil & Gas Operator | Nov 1995 |