| 301 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2024 |
| 302 | Quien Sabe Operating, LLC | Sundown, TX 79372 | Oil & Gas Operator | Nov 2023 |
| 303 | R & C Oil Company LLC | Westbrook, TX 79565 | Oil Operator | May 2024 |
| 304 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 305 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 306 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 307 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 308 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | May 2024 |
| 309 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 310 | Red Star Operating LLC | Lubbock, TX 79403 | Oil Operator | May 2024 |
| 311 | Red Tank Resources, LLC | Dallas, TX 75379 | Oil & Gas Operator | May 2024 |
| 312 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 313 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | May 2024 |
| 314 | RHB Exploration & Production,LLC | Grapevine, TX 76099 | Oil & Gas Operator | May 2024 |
| 315 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 316 | Richmond Drilling Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 317 | Rico Oil Company | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 318 | Riley Production, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2012 |
| 319 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 320 | Robinson Drilling Of Texas | Big Spring, TX 79721 | Oil & Gas Operator | Oct 1996 |
| 321 | Roon Energy, Inc. | Dickinson, TX 77539 | Oil Operator | May 2024 |
| 322 | Rover Petroleum Operating, LLC | Plano, TX 75075 | Oil & Gas Operator | May 2024 |
| 323 | Russell, Phillip | Colorado City, TX 79512 | Oil & Gas Operator | May 2024 |
| 324 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | May 2024 |
| 325 | Rust Operating Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Feb 2000 |
| 326 | Ruwco Oil And Gas Corp. | Austin, TX 78701 | Oil & Gas Operator | Aug 2021 |
| 327 | S & M Royalty | Andrews, TX 79714 | Oil & Gas Operator | Jan 1997 |
| 328 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 329 | Sabinal Energy Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2024 |
| 330 | Sackerol Enterprises, Inc. | Plattsburgh, NY 12901 | Oil & Gas Operator | May 2024 |
| 331 | Saga Pet. LTD Liability Co Of Co | Midland, TX 79701 | Oil & Gas Operator | Apr 2004 |
| 332 | Saguaro Petroleum, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2024 |
| 333 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 334 | Samis Oil Company, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2000 |
| 335 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 336 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 337 | Satanta Oil Company | Midland, TX 79704 | Oil & Gas Operator | May 2024 |
| 338 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 339 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 340 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 341 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 342 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | May 2024 |
| 343 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 344 | SD Royale Energy, Inc. | San Diego, CA 92159 | Oil & Gas Operator | May 2024 |
| 345 | SDX Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | May 2024 |
| 346 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | May 2024 |
| 347 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 348 | Shenandoah Petroleum Corporation | Midland, TX 79705 | Oil & Gas Operator | May 2024 |
| 349 | Simata Energy | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 350 | Simata Energy, LLC | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 351 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2024 |
| 352 | Smith Brothers Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 353 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Mar 2024 |
| 354 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | May 2024 |
| 355 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 356 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 357 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 358 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2024 |
| 359 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | May 2024 |
| 360 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 361 | Sterlynn Oil & Gas, Inc. | Harper, TX 78631 | Oil Operator | May 2024 |
| 362 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 363 | Sweet Crude Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | May 2024 |
| 364 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2024 |
| 365 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 366 | SWJN Oil Company | Kilgore, TX 75663 | Oil Operator | May 2024 |
| 367 | T & M Oil Company | Midlothian, TX 76065 | Oil & Gas Operator | May 2024 |
| 368 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 369 | Tacor Resources Inc | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 370 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 371 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 372 | Taurus Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 373 | Tayco Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Nov 1996 |
| 374 | Taylor-Link Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Apr 2017 |
| 375 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2024 |
| 376 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | May 2024 |
| 377 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | May 2024 |
| 378 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Mar 2024 |
| 379 | Thomas Exploration & Devel., Inc | Jourdanton, TX 78026 | Oil & Gas Operator | May 2024 |
| 380 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 381 | Three J'S Petroleum, Inc. | Lubbock, TX 79452 | Oil & Gas Operator | May 2024 |
| 382 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 383 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 384 | Tindle Petroleum LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 385 | Titan Resources I, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 386 | TNCH, LLC | Colorado City, TX 79512 | Oil Operator | May 2024 |
| 387 | Topat Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Sep 2017 |
| 388 | Tradition Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 389 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 390 | Trans Oil Marketing LLC | Abilene, TX 79602 | Oil Operator | Aug 2023 |
| 391 | Travis, J. J., Trustee | Rockport, TX 78382 | Oil & Gas Operator | Dec 1996 |
| 392 | Trend Exploration Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 393 | Trey Exploration, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2020 |
| 394 | Triag Energy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2014 |
| 395 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2024 |
| 396 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 397 | Tucker Drilling Company, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Jul 1996 |
| 398 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 399 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 400 | Unified Oil & Gas Corp. | Snyder, TX 79550 | Oil Operator | May 2024 |