| 301 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | Apr 2025 |
| 302 | Opal Resources Operating Co.,LLC | Cypress, TX 77429 | Oil & Gas Operator | Jan 2019 |
| 303 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 304 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 305 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 306 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 307 | P4 Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 308 | Panada Exploration, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1996 |
| 309 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 310 | Panther Exploration, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2017 |
| 311 | Paradis Investments, L.L.C. | Bellaire, TX 77401 | Oil Operator | Jun 2020 |
| 312 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 313 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 314 | Patriot Production LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2023 |
| 315 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 316 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 317 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 318 | Pdeh LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 319 | Penn VIrginia Oil & Gas Corp | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 320 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 321 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 322 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 323 | Percussion Petroleum Oper II,LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2023 |
| 324 | Permian Development, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 325 | Permian Resources Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 326 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 327 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 328 | Petro-Hunt Permian, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 329 | Petrocorp Acquisition Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2002 |
| 330 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 331 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 332 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 333 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 334 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Dec 2024 |
| 335 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 336 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2025 |
| 337 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 338 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 339 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 340 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 341 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 342 | Point Energy Partners Petro, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 343 | Preferred Pipeline Corp. | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 344 | Priest Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 345 | Propel Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2013 |
| 346 | Putnam, Paul Oil | Orla, TX 79770 | Oil & Gas Operator | Apr 2025 |
| 347 | Pyramid Gas Co | Midland, TX 79707 | Oil Operator | Apr 2025 |
| 348 | Q Natural Resources, LLC | Jones, OK 73049 | Oil & Gas Operator | Apr 2025 |
| 349 | QP, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 350 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2025 |
| 351 | Ranger 40 Petroleum, LLC | Fairfield, CT 06824 | Oil & Gas Operator | Apr 2025 |
| 352 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Apr 2025 |
| 353 | Read & Stevens, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2023 |
| 354 | Red Willow Production, LLC | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2015 |
| 355 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Apr 2025 |
| 356 | Reeves County Systems, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Aug 2019 |
| 357 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 358 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Apr 2025 |
| 359 | Renaud Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 360 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 361 | Richmond Petroleum Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Aug 2003 |
| 362 | Rio Oil And Gas (Permian) II,LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Nov 2024 |
| 363 | Rki Exploration & Production LLC | Tulsa, OK 74172 | Oil & Gas Operator | Apr 2025 |
| 364 | Robertson Resources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2025 |
| 365 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 366 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 367 | Rockbridge Petroleum LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2009 |
| 368 | Rodan, Inc. | Wink, TX 79789 | Oil & Gas Operator | Apr 2025 |
| 369 | Rosehill Operating Company, LLC | Houston, TX 77084 | Oil & Gas Operator | Sep 2021 |
| 370 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 371 | Rover Operating Inc | Richardson, TX 75080 | Oil & Gas Operator | Apr 2000 |
| 372 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 373 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2025 |
| 374 | S & P Energy | Benbrook, TX 76126 | Oil & Gas Operator | Oct 1994 |
| 375 | S & P Energy, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Aug 2003 |
| 376 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 377 | Sable Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Nov 1999 |
| 378 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 379 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | Apr 2025 |
| 380 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 381 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 382 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 383 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 384 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2025 |
| 385 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 386 | Saxet Oil Corporation | Midland, TX 79708 | Oil & Gas Operator | Apr 2025 |
| 387 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 388 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 389 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 390 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 391 | Seco Production Company | Midland, TX 79708 | Oil & Gas Operator | Aug 2003 |
| 392 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 393 | Shale Energy LLC | Jeffersonville, KY 40337 | Oil Operator | Dec 2018 |
| 394 | Sharon Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2010 |
| 395 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Jan 2025 |
| 396 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Apr 2025 |
| 397 | Shenandoah Petroleum Corporation | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 398 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2025 |
| 399 | Siete Oil And Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 400 | Silver Hill Energy Partners, LLC | Dallas, TX 75219 | Oil & Gas Operator | Feb 2017 |