| 401 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 402 | Moseley, J. T. | Temple, TX 76502 | Oil & Gas Operator | Sep 2008 |
| 403 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 404 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 405 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 406 | Murphree Brothers Production | Monahans, TX 79756 | Oil & Gas Operator | Apr 2025 |
| 407 | Murphree Production | Monahans, TX 79756 | Oil & Gas Operator | Jul 2014 |
| 408 | Murray, Tom Enterprises | Monahans, TX 79756 | Oil & Gas Operator | Apr 2025 |
| 409 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 410 | MV2 Energy, Inc. | Houston, TX 77069 | Oil & Gas Operator | Apr 2025 |
| 411 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 412 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 413 | Myco Petroleum | Lovington, NM 88260 | Oil & Gas Operator | Apr 2025 |
| 414 | N & B Oil And Gas LLC | Monahans, TX 79756 | Oil & Gas Operator | Apr 2025 |
| 415 | Naco Production | Midland, TX 79708 | Oil & Gas Operator | Aug 2003 |
| 416 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 417 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Apr 2025 |
| 418 | Nec Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2025 |
| 419 | Nesitor West Texas LLC | Frisco, TX 75034 | Oil & Gas Operator | Apr 2025 |
| 420 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2025 |
| 421 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 422 | Nizen, Stanley | FT Stockton, TX 79735 | Oil & Gas Operator | May 2002 |
| 423 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 424 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 425 | North Operating Company | Canton, TX 75103 | Oil & Gas Operator | Apr 2025 |
| 426 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 427 | Norwood, A. N., Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 428 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | Apr 2025 |
| 429 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 430 | O. H. M. Operating | Pampa, TX 79065 | Oil & Gas Operator | Apr 2025 |
| 431 | Oahe Oil Company | Texline, TX 79087 | Oil & Gas Operator | May 2004 |
| 432 | Oasis Petroleum Permian LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 433 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 434 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 435 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 436 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 437 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 438 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 439 | Oklahoma RB Operating Company | Midland, TX 79701 | Oil & Gas Operator | Jan 1998 |
| 440 | Olifant Energy LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2019 |
| 441 | Olsen Energy Inc. | Boerne, TX 78006 | Oil & Gas Operator | Apr 2025 |
| 442 | Omar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 443 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 444 | On Pointe Operating LLC | Jones, OK 73049 | Oil & Gas Operator | Apr 2025 |
| 445 | Orion Energen Inc. | Austin, TX 78731 | Oil & Gas Operator | Jul 2023 |
| 446 | Orla Petco, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 447 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 448 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 449 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 450 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 451 | Pa Prospect LLC | Columbus, MT 59019 | Oil & Gas Operator | Jul 2020 |
| 452 | Pablo Energy, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2005 |
| 453 | Page Exploration | Midland, TX 79701 | Oil & Gas Operator | Apr 2007 |
| 454 | Paloma Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 455 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 456 | Panther Exploration, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2017 |
| 457 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 458 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 459 | Parsley Energy Operations, LLC | Irving, TX 75038 | Oil & Gas Operator | Jan 2021 |
| 460 | Passmore, Mike F. | Monahans, TX 79756 | Oil & Gas Operator | Apr 2025 |
| 461 | Patriot Production LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2023 |
| 462 | Patriot Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 463 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 464 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 465 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 466 | Pdeh LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 467 | Pearce Trust And Blair | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 468 | Pearl, Bill H. Productions, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Apr 2025 |
| 469 | Pecos Operators, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 470 | Pennant Dev. And Prod., LLC | Midland, TX 79702 | Oil Operator | Apr 2025 |
| 471 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 472 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 473 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 474 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 475 | Percussion Petroleum Oper II,LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2023 |
| 476 | Perimeter Resource Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 477 | Permian Resources Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 478 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 479 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | Apr 2025 |
| 480 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 481 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 482 | Petro-Hunt Permian, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 483 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 484 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 485 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 486 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 487 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 488 | Petx Operating LLC | Sheridan, WY 82801 | Oil Operator | Apr 2025 |
| 489 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2025 |
| 490 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 491 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 492 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 493 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2025 |
| 494 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 495 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 496 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 497 | Plateau Energy, LLC | Smyer, TX 79367 | Oil & Gas Operator | Dec 2023 |
| 498 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 499 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 500 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |