| 301 | Perkins-Prothro Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2002 |
| 302 | Permian Legend LLC | San Marcos, TX 78666 | Oil Operator | Jul 2025 |
| 303 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 304 | Perry, J. R. & Co. | Haskell, TX 79521 | Oil & Gas Operator | Jul 2015 |
| 305 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 306 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 307 | Petrosource Energy Corporation | Fort Worth, TX 76112 | Oil & Gas Operator | Jul 2025 |
| 308 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 309 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 310 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 311 | Pioneer Energy Corporation | Dallas, TX 75204 | Oil & Gas Operator | Jul 2025 |
| 312 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 313 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 314 | Pony Express Corporate Trust | Aledo, TX 76008 | Oil & Gas Operator | Jul 2025 |
| 315 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 316 | Price, W. H. | Granbury, TX 76048 | Oil & Gas Operator | Jun 2024 |
| 317 | Quail Operating, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jul 2025 |
| 318 | Quail Well Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 319 | Rampart Petroleum, Incorporated | Buffalo Gap, TX 79508 | Oil & Gas Operator | Jan 2009 |
| 320 | Ratts, Robert V. Inc. | Bedford, TX 76021 | Oil & Gas Operator | Aug 2003 |
| 321 | Ray Herring Estate | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 322 | Ray Herring Operating Co., LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 323 | Rayco Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 324 | Red-Tex Petroleum, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 325 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 326 | Rigged Up, LLC | Graham, TX 76450 | Oil Operator | Jul 2025 |
| 327 | Rister Oil&Gas International LLC | Eastland, TX 76448 | Oil & Gas Operator | Jul 2025 |
| 328 | Rister, Dewey | Avoca, TX 79503 | Oil & Gas Operator | Jul 2025 |
| 329 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2025 |
| 330 | Ro-Jo, Inc. | Highland VLG, TX 75077 | Oil & Gas Operator | Aug 2003 |
| 331 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jul 2025 |
| 332 | Robinson Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Aug 2012 |
| 333 | Roco Petroleum, Incorporated | Abilene, TX 79605 | Oil & Gas Operator | Jul 2025 |
| 334 | Rogers Drilling Co. | Olney, TX 76374 | Oil & Gas Operator | Jul 2025 |
| 335 | Ross, Dwight M. DRLG. Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 2025 |
| 336 | Royal Texan Energy Co. | Irvine, CA 92618 | Oil & Gas Operator | Jul 2025 |
| 337 | Royal Texan Resources Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 338 | RPM Petroleum, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Apr 2013 |
| 339 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | Jul 2025 |
| 340 | Rust Operating Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Feb 2000 |
| 341 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 342 | S & M Drilling, LLC | Wichita Falls, TX 76308 | Oil Operator | Sep 2023 |
| 343 | S & S Well Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Aug 1998 |
| 344 | S. M. A. Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1997 |
| 345 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 346 | S.U.E. Company | Abilene, TX 79604 | Oil Operator | Jan 1998 |
| 347 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 348 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Jul 2025 |
| 349 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 350 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 351 | Sanders Energy LLC | Aledo, TX 76008 | Oil & Gas Operator | Jul 2025 |
| 352 | Santa Fe Exploration Company | Lubbock, TX 79408 | Oil & Gas Operator | Nov 1997 |
| 353 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 354 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 355 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 356 | Schetawee, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Mar 2008 |
| 357 | Schiff, H. G. & Co. | Dallas, TX 75206 | Oil & Gas Operator | Jul 1993 |
| 358 | Schkade, Louis | Albany, TX 76430 | Oil & Gas Operator | Mar 2008 |
| 359 | Scott Operating, Inc. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 360 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 361 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 362 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 363 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 364 | Smalley, Bill | Albany, TX 76430 | Oil & Gas Operator | Jul 2001 |
| 365 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 366 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 367 | Snyder Drilling Corp. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 368 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 369 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 370 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Jul 2025 |
| 371 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 372 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Jul 2025 |
| 373 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2025 |
| 374 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 375 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Jul 2025 |
| 376 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 377 | Staley, Jack C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 378 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2025 |
| 379 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 380 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 381 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 382 | Steinberger, Gerald | Windthorst, TX 76389 | Oil & Gas Operator | Sep 2007 |
| 383 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 384 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 385 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 386 | Stowe Energy, Inc. | Vernon, TX 76384 | Oil & Gas Operator | Mar 2003 |
| 387 | Stryker Energy Corp. | Mesquite, TX 75180 | Oil & Gas Operator | Jul 2025 |
| 388 | Subsea Operating Co. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 389 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Jul 2025 |
| 390 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 391 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Jul 2025 |
| 392 | Susanna Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 393 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2025 |
| 394 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Jul 2025 |
| 395 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 396 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 397 | Tankersley, D. C. | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 398 | Tara Company, The | Wichita Falls, TX 76301 | Oil Operator | Sep 2003 |
| 399 | Taylor, J. S. Inc. | Lewisville, TX 75057 | Oil & Gas Operator | Jul 2025 |
| 400 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |