| 401 | O. H. M. Operating | Pampa, TX 79065 | Oil & Gas Operator | Jun 2026 |
| 402 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 403 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 404 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Jun 2026 |
| 405 | Octane Energy Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 406 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 407 | Ogx Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 408 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 409 | Olsen Energy Inc. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2026 |
| 410 | Omimex Energy, Inc. | Fort Worth, TX 76120 | Oil & Gas Operator | Mar 2026 |
| 411 | On Pointe Operating LLC | Jones, OK 73049 | Oil & Gas Operator | Jun 2026 |
| 412 | Origin Production Group LLC | Luling, TX 78648 | Oil Operator | Jun 2026 |
| 413 | Orla Petco, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jun 2026 |
| 414 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 415 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 416 | Oxbow Petroleum, LLC | Midland, TX 79703 | Oil & Gas Operator | May 2025 |
| 417 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jun 2026 |
| 418 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Jun 2026 |
| 419 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jun 2026 |
| 420 | Pa Prospect LLC | Columbus, MT 59019 | Oil & Gas Operator | Jul 2020 |
| 421 | Pacesetter Energy, Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | May 2008 |
| 422 | Pacesetter Energy, LLC | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2020 |
| 423 | Panther Exploration, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2017 |
| 424 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2026 |
| 425 | Parish, John R. | Andrews, TX 79714 | Oil & Gas Operator | Jun 2026 |
| 426 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 427 | Parsley Energy Operations, LLC | Irving, TX 75038 | Oil & Gas Operator | Jan 2021 |
| 428 | Patriot Production LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2023 |
| 429 | Patriot Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 430 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 431 | Pbex Operations, LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 432 | Pcore Exploration & Prod II LLC | Golden, CO 80401 | Oil & Gas Operator | Jun 2020 |
| 433 | PDC Permian, Inc. | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 434 | Pdeh LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 435 | Pearce Trust And Blair | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 436 | Pearce, Roy F., Jr. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 437 | Pecos Production Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2005 |
| 438 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 439 | Penn VIrginia Oil & Gas Corp | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 440 | Pennant Dev. And Prod., LLC | Midland, TX 79702 | Oil Operator | Jun 2026 |
| 441 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 442 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 443 | Perimeter Resource Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 444 | Permian Resources Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 445 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 446 | Permian Solutions LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 447 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2026 |
| 448 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 449 | Petro-Hunt Permian, LLC | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 450 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 451 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 452 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 453 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 454 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 455 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 456 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 457 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 458 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 459 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Jun 2026 |
| 460 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 461 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 462 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 463 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 464 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 465 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2026 |
| 466 | Premier Oil & Gas LLC | Blanchard, OK 73010-2010 | Oil Operator | Dec 2022 |
| 467 | Prensorus Energy, LLC | Abilene, TX 79604 | Oil & Gas Operator | Jun 2026 |
| 468 | Pri Operating, LLC | Austin, TX 78730 | Oil & Gas Operator | Jun 2026 |
| 469 | Priest Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 470 | Primal Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2026 |
| 471 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 472 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 473 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 474 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 475 | Purvis Oil Corp | Midland, TX 79702 | Oil & Gas Operator | Jul 1994 |
| 476 | Purvis Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 477 | Putnam, Paul Oil | Orla, TX 79770 | Oil & Gas Operator | Jun 2026 |
| 478 | Pyote Disposal Company | Pyote, TX 79777 | Oil Operator | Jun 2026 |
| 479 | Q Natural Resources, LLC | Jones, OK 73049 | Oil & Gas Operator | Jun 2026 |
| 480 | Quadrum Energy LLC | Houston, TX 77042 | Oil Operator | Aug 2019 |
| 481 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2026 |
| 482 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 483 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 484 | R. & R. Exploration, Inc. | Denton, TX 76202 | Oil Operator | Nov 1993 |
| 485 | Rand Oil & Gas Corp. | Houston, TX 77040 | Oil & Gas Operator | Jun 2026 |
| 486 | Ranger 40 Petroleum, LLC | Fairfield, CT 06824 | Oil & Gas Operator | Jun 2026 |
| 487 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Jun 2026 |
| 488 | Raw Production | Kermit, TX 79745 | Oil & Gas Operator | Jun 2026 |
| 489 | Ray Oil Company | Dallas, TX 75370 | Oil Operator | Dec 1989 |
| 490 | Rayden | Southlake, TX 76092 | Oil & Gas Operator | Jun 2026 |
| 491 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 492 | RCS Drilling Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 1994 |
| 493 | Re-Op Corp. | Houston, TX 77274 | Oil & Gas Operator | Jun 2026 |
| 494 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 495 | Recovery Operating LP | San Angelo, TX 76904 | Oil & Gas Operator | Jun 2026 |
| 496 | Red Stone Resources LLC | Edmond, OK 73013 | Oil Operator | Jun 2023 |
| 497 | Red Willow Production, LLC | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2015 |
| 498 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Jun 2026 |
| 499 | Reeves County Systems, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Aug 2019 |
| 500 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Jun 2026 |