| 301 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 302 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 303 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 304 | PNG Gathering, LLC | Wellington, TX 79095 | Oil & Gas Operator | Apr 2025 |
| 305 | PNG Production, LLC | Wellington, TX 79095 | Oil & Gas Operator | Apr 2025 |
| 306 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 307 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 308 | Ponderosa TX Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Apr 2025 |
| 309 | Pool, Lloyd Operating | Sandia Park, NM 87047 | Gas Operator | Dec 2013 |
| 310 | Porter Operating Company, L.L.C. | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 311 | Prairie Energy Company | Fort Worth, TX 76185 | Oil & Gas Operator | Mar 2003 |
| 312 | Prairie Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Jan 2017 |
| 313 | Premier Energy, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2008 |
| 314 | Price Oil & Gas Co. | Houston, TX 77254 | Oil & Gas Operator | Feb 2002 |
| 315 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 316 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2025 |
| 317 | Production Consultants, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Feb 2017 |
| 318 | Pruett, Cecil | Borger, TX 79008 | Oil & Gas Operator | Aug 2003 |
| 319 | Pursley Gas Company | Pampa, TX 79066 | Gas Operator | Apr 2025 |
| 320 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 321 | Quest-Tex Energy Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 322 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Apr 2025 |
| 323 | Quinque Operating Company | Liberal, KS 67905 | Oil & Gas Operator | Dec 2024 |
| 324 | R & R Oil Company | Pampa, TX 79065 | Oil & Gas Operator | Jul 2002 |
| 325 | Ramsey & Gassaway | Borger, TX 79008 | Gas Operator | Jun 1999 |
| 326 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2025 |
| 327 | RBR Oil And Gas Company | Pampa, TX 79066 | Oil & Gas Operator | Dec 2001 |
| 328 | Rebel Resources LBC LLC | Sunray, TX 79086 | Gas Operator | Apr 2025 |
| 329 | Red Line Company, LTD. | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 330 | Red Water Resources, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Apr 2025 |
| 331 | Redstone Operating, Inc. | Austin, TX 78734 | Oil & Gas Operator | Jan 2015 |
| 332 | Remarkable Operating Co. | Pampa, TX 79065 | Gas Operator | Jul 2019 |
| 333 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Apr 2025 |
| 334 | Reneau, James Seed Co. | Shamrock, TX 79079 | Oil & Gas Operator | Apr 2025 |
| 335 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 336 | Rimrock Gas Company | Weatherford, OK 73096 | Oil & Gas Operator | May 2008 |
| 337 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Apr 2025 |
| 338 | Robinson Drilling Of Texas | Big Spring, TX 79721 | Oil & Gas Operator | Oct 1996 |
| 339 | Rojo Oil Company | McLean, TX 79057 | Oil & Gas Operator | Apr 2025 |
| 340 | Romines & Warner | Pampa, TX 79065 | Oil & Gas Operator | Jan 2002 |
| 341 | Romines Operating Group | Pampa, TX 79066 | Oil & Gas Operator | Nov 2022 |
| 342 | Roxi Production | Pampa, TX 79065 | Oil & Gas Operator | Apr 2025 |
| 343 | RTD Inc | Bartlesville, OK 74006 | Oil Operator | Jan 1995 |
| 344 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 345 | S & W Oil & Gas, LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 346 | Sage Petroleum Co. | Borger, TX 79007 | Oil & Gas Operator | Dec 2002 |
| 347 | Sanchez Production, LLC | Pampa, TX 79065 | Oil & Gas Operator | Apr 2025 |
| 348 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 349 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 350 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 351 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 352 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 353 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 354 | Seek Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 355 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 356 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 357 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Jan 2025 |
| 358 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 359 | Sidwell Operating Company, L.P. | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2025 |
| 360 | Sigma Exploration Corp., The | Dallas, TX 75230 | Oil & Gas Operator | Sep 1998 |
| 361 | Sinow, G. S. | Pampa, TX 79066 | Oil & Gas Operator | Oct 1995 |
| 362 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Apr 2025 |
| 363 | Smith, W.T. | Panhandle, TX 79068 | Oil & Gas Operator | Nov 2005 |
| 364 | Snappy Services, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 365 | SNW Operating Company | Borger, TX 79008 | Oil & Gas Operator | Apr 2025 |
| 366 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 367 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2025 |
| 368 | Sportsman Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Nov 1998 |
| 369 | Stahl Petroleum Co. | Amarillo, TX 79118 | Oil & Gas Operator | Aug 2003 |
| 370 | Stallion Energy LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2009 |
| 371 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 372 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 373 | Sukay Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 374 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 375 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 376 | T&R Energy Services | Pampa, TX 79065 | Oil & Gas Operator | Apr 2025 |
| 377 | Talon Oil & Gas LLC | Dallas, TX 75243 | Oil & Gas Operator | Dec 2010 |
| 378 | Taylor Properties | Wichita Falls, TX 76301 | Gas Operator | Apr 2025 |
| 379 | Taylor-Clayton-Hawley | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2019 |
| 380 | TB Operating, LLC | Borger, TX 79008 | Oil & Gas Operator | Jun 2018 |
| 381 | Tex-Well Oil & Gas Corp. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 382 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Apr 2025 |
| 383 | Textroleum Production, Inc. | Lubbock, TX 79452 | Oil & Gas Operator | Mar 2008 |
| 384 | The Operating Co. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2007 |
| 385 | Tigrett, Robert L. Oil & Gas Co. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2013 |
| 386 | Top O'Texas Energy, L.P. | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 387 | Top O'Texas Production Co. | Pampa, TX 79065 | Oil & Gas Operator | May 2024 |
| 388 | Top O'Texas Production, Inc. | Odessa, TX 79764 | Oil & Gas Operator | Feb 1997 |
| 389 | Trans Terra Corp., International | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2009 |
| 390 | Travelers Oil Company | Amarillo, TX 79102 | Oil & Gas Operator | Apr 2025 |
| 391 | Trejim Operators, LLC | Pampa, TX 79065 | Oil & Gas Operator | Apr 2025 |
| 392 | Trek Exploration, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Apr 2025 |
| 393 | Triple J Oil Co. | Pampa, TX 79065 | Oil & Gas Operator | Aug 1996 |
| 394 | Tryma Operating | Borger, TX 79008 | Oil & Gas Operator | Apr 2025 |
| 395 | Tumble Weed Production Co. | Borger, TX 79008 | Oil & Gas Operator | Dec 1994 |
| 396 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 397 | Valero Marketing & Supply Co | San Antonio, TX 78269-6000 | Oil & Gas Operator | Sep 2023 |
| 398 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 399 | Viola Prod., Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 400 | Vision Stone Petroleum, LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |