| 301 | Orion Oil & Gas Properties | Amarillo, TX 79109 | Gas Operator | Oct 2000 |
| 302 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 303 | Otc Petroleum Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2015 |
| 304 | Ovation Energy, LP | N Richlnd HLS, TX 76180 | Oil & Gas Operator | Sep 2004 |
| 305 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2026 |
| 306 | P-2 Exploration Co. | Amarillo, TX 79124 | Oil & Gas Operator | Feb 2005 |
| 307 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 308 | Paleo, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2026 |
| 309 | Palo Duro Resources LLC | Perryton, TX 79070 | Oil & Gas Operator | Jul 2026 |
| 310 | Pampa Water Disposal, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2026 |
| 311 | Pan Resources, Inc. | Borger, TX 79007 | Oil & Gas Operator | Mar 2008 |
| 312 | Panhandle Producing Co., Oper. | San Antonio, TX 78205 | Oil & Gas Operator | Oct 1993 |
| 313 | Panhandle Producing Company | San Antonio, TX 78205 | Oil & Gas Operator | Oct 1993 |
| 314 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Jul 2026 |
| 315 | Parallel Energy LP | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2015 |
| 316 | Pash Energy, Inc. | Borger, TX 79008 | Oil & Gas Operator | Jul 2026 |
| 317 | Perkins-Prothro Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2002 |
| 318 | Petro-Haley | Borger, TX 79008 | Oil & Gas Operator | Jul 2026 |
| 319 | Petrolia Group, L.L.C. | Katy, TX 77449 | Oil & Gas Operator | Jul 2026 |
| 320 | PG-M International Operating,LLC | Borger, TX 79008 | Oil & Gas Operator | Jul 2026 |
| 321 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 322 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2026 |
| 323 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 324 | Plemons Enterprises | Borger, TX 79008 | Oil & Gas Operator | Aug 1998 |
| 325 | Plumley, M. C. & Associates | Borger, TX 79008 | Oil & Gas Operator | Jul 2026 |
| 326 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 327 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 328 | Polaris Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Jul 2026 |
| 329 | Ponderosa TX Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Jul 2026 |
| 330 | Pony Oil Company | Borger, TX 79008 | Oil & Gas Operator | Jul 2001 |
| 331 | Porter Operating Company, L.L.C. | Pampa, TX 79066 | Oil & Gas Operator | Jul 2026 |
| 332 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 333 | Prairie Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Jan 2017 |
| 334 | Producers Environmental Ser. Inc | Borger, TX 79008 | Oil & Gas Operator | Jul 2026 |
| 335 | Pruett, Cecil | Borger, TX 79008 | Oil & Gas Operator | Aug 2003 |
| 336 | Qri Industries, Inc. | Katy, TX 77449 | Oil Operator | Jul 2026 |
| 337 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Apr 2026 |
| 338 | Quest-Tex Energy Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Jul 2026 |
| 339 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Jul 2026 |
| 340 | Questa Operating Company, LLC | Amarillo, TX 79159 | Oil & Gas Operator | Jul 2026 |
| 341 | Quinque Operating Company | Liberal, KS 67905 | Oil & Gas Operator | Mar 2026 |
| 342 | R & A Moore, Inc. | Cleburne, TX 76033 | Oil & Gas Operator | Jul 2026 |
| 343 | R.E.D. Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2004 |
| 344 | Rabco Energy | Amarillo, TX 79120 | Oil & Gas Operator | Apr 2025 |
| 345 | Rabco Energy LLC | Amarillo, TX 79120 | Oil & Gas Operator | Jul 2026 |
| 346 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 347 | Rass Operating | Amarillo, TX 79124 | Oil & Gas Operator | Jul 2008 |
| 348 | Red Line Company, LTD. | Pampa, TX 79066 | Oil & Gas Operator | Jul 2026 |
| 349 | Redstone Operating, Inc. | Austin, TX 78734 | Oil & Gas Operator | Jan 2015 |
| 350 | Reneau, James Seed Co. | Shamrock, TX 79079 | Oil & Gas Operator | Jul 2026 |
| 351 | Restoration Energy LLC | Amarillo, TX 79124 | Oil & Gas Operator | Jul 2026 |
| 352 | Revolution Operating Company,LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2024 |
| 353 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 354 | Rig Petroleum, LLC | Spearman, TX 79081 | Oil & Gas Operator | Jul 2026 |
| 355 | Rimrock Gas Company | Weatherford, OK 73096 | Oil & Gas Operator | May 2008 |
| 356 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Jul 2026 |
| 357 | Romac Oil Company, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Jul 2026 |
| 358 | Romines & Warner | Pampa, TX 79065 | Oil & Gas Operator | Jan 2002 |
| 359 | Romines Operating Group | Pampa, TX 79066 | Oil & Gas Operator | Nov 2022 |
| 360 | Roxi Production | Pampa, TX 79065 | Oil & Gas Operator | Jul 2026 |
| 361 | RTD Inc | Bartlesville, OK 74006 | Oil Operator | Jan 1995 |
| 362 | S. A. Oil Account | Borger, TX 79008 | Oil & Gas Operator | Dec 1997 |
| 363 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2026 |
| 364 | Samco | Whitesboro, TX 76273 | Oil & Gas Operator | Aug 2013 |
| 365 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 366 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 367 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2026 |
| 368 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 369 | Sand Springs Oil & Gas Co. | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2026 |
| 370 | Sanders & Smith, L.C. | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2004 |
| 371 | Sargeco, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2018 |
| 372 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2026 |
| 373 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 374 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 375 | Sigma Exploration Corp., The | Dallas, TX 75230 | Oil & Gas Operator | Sep 1998 |
| 376 | Silver Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2026 |
| 377 | Sip'S Oil & Gas Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 2026 |
| 378 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jul 2026 |
| 379 | Smith, O. Dale & Smith, A. C. | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2000 |
| 380 | SNW Operating Company | Borger, TX 79008 | Oil & Gas Operator | Jul 2026 |
| 381 | South Florida Investment Company | Pampa, TX 79066 | Oil & Gas Operator | Jun 1997 |
| 382 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jul 2026 |
| 383 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Apr 2026 |
| 384 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2026 |
| 385 | Stahl Petroleum Co. | Amarillo, TX 79118 | Oil & Gas Operator | Aug 2003 |
| 386 | Stallion Energy LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2009 |
| 387 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 388 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 389 | Sunray Oil Co., Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2013 |
| 390 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Jul 2026 |
| 391 | Supa Energy, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Jul 2026 |
| 392 | T&R Energy Services | Pampa, TX 79065 | Oil & Gas Operator | Jul 2026 |
| 393 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Jul 2026 |
| 394 | Taylor, Gordon Oil Company | Sunray, TX 79086 | Oil & Gas Operator | Apr 1996 |
| 395 | Taylor, Gordon Oil Company, LP | Sunray, TX 79086 | Oil & Gas Operator | Feb 2014 |
| 396 | TB Operating, LLC | Borger, TX 79008 | Oil & Gas Operator | Jun 2018 |
| 397 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Jul 2026 |
| 398 | Tecolote Energy Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 399 | Tess Oil Company | Borger, TX 79008 | Oil & Gas Operator | Mar 2008 |
| 400 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Jul 2026 |