| 301 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 302 | Redmon Oil Company, Inc., The | Plano, TX 75023 | Oil & Gas Operator | May 2025 |
| 303 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | May 2025 |
| 304 | Reserve Management, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 305 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | May 2025 |
| 306 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 307 | Reynolds E & P, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 308 | Rife Energy Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 309 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 310 | Rising Star Petroleum, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2010 |
| 311 | River City Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 312 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 313 | Roach, R. Byron Trustee | Judson, TX 75660 | Oil & Gas Operator | Mar 1999 |
| 314 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 315 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | May 2025 |
| 316 | RWJ Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 317 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 318 | Sabio Oil & Gas Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 1998 |
| 319 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 320 | Samis Oil Company, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2000 |
| 321 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 322 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 323 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 324 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 325 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 326 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 327 | Sikes Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jun 2003 |
| 328 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | May 2025 |
| 329 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 330 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 331 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 332 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 333 | Sklar-Tex L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 334 | SM Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 335 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 336 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 337 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 338 | Sonat Exploration Company-MCR | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 339 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 340 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 341 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 342 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | May 2025 |
| 343 | Stephenson Oil & Gas, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Sep 1999 |
| 344 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | May 2025 |
| 345 | SW Operating, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2000 |
| 346 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 347 | T-Bar-X Limited Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2005 |
| 348 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | May 2025 |
| 349 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 350 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 351 | Teco Operating Company | Athens, TX 75751 | Oil & Gas Operator | Jun 2001 |
| 352 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | May 2025 |
| 353 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | May 2025 |
| 354 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 355 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 356 | Texas Utilities Fuel Co. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2018 |
| 357 | Texas Utilities Mining Co. | Dallas, TX 75201 | Oil & Gas Operator | May 1995 |
| 358 | TGNR Gulf Coast LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 359 | Thor Operating Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 1995 |
| 360 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 361 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 362 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | May 2025 |
| 363 | Triton Energy LLC | Wortham, TX 76693 | Oil & Gas Operator | May 2025 |
| 364 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 365 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 366 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 367 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 368 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 369 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2025 |
| 370 | United Energy Operating, LLC | Edmond, OK 73083 | Oil & Gas Operator | May 2025 |
| 371 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | May 2025 |
| 372 | Vanco Oil & Gas Corp. | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 373 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 374 | Vantage Operating, LLC | San Antonio, TX 78230 | Oil & Gas Operator | May 2025 |
| 375 | Veritas Energy LLC | San Antonio, TX 78231 | Oil & Gas Operator | May 2025 |
| 376 | W & W Services, Inc. | Palestine, TX 75802 | Oil & Gas Operator | Mar 2008 |
| 377 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 378 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 379 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 380 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 381 | Warrior Petroleum Corporation | Henderson, TX 75652 | Oil & Gas Operator | Apr 2024 |
| 382 | Wentworth Energy, Inc. | Palestine, TX 75801 | Oil & Gas Operator | Jun 2009 |
| 383 | Westoil LLC | Austin, TX 78747 | Oil & Gas Operator | May 2025 |
| 384 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 385 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | May 2025 |
| 386 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 387 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 388 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | May 2025 |
| 389 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | May 2025 |
| 390 | Wisenbaker Production Company | Tyler, TX 75702 | Oil & Gas Operator | Oct 2011 |
| 391 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 392 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 393 | Young, Clint Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 394 | Yuma Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Aug 2002 |
| 395 | Z/F Little Buddy, L.P. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2000 |
| 396 | Zapata-Fender, L. L. C. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2001 |