| 401 | Oil & Gas Operations | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 402 | Oleum Energy LLC | Georgetown, TX 78628 | Oil & Gas Operator | Sep 2025 |
| 403 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 404 | Opal Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 405 | Orion Oil & Gas Prop | Roswell, NM 88202 | Oil & Gas Operator | Apr 1998 |
| 406 | Orla Petco Inc & Hopi Drilling Co | Midland, TX 79702 | Oil Operator | Sep 2004 |
| 407 | Orla Petco, Inc. | Midland, TX 79708 | Oil & Gas Operator | Dec 2025 |
| 408 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 409 | Oso Perdido Services LLC | Flatonia, TX 78941 | Oil Operator | Sep 2025 |
| 410 | Owens Pet Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 411 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 412 | Oxy USA WTP Limited Partnership | Houston, TX 772104294 | Oil & Gas Operator | Sep 2025 |
| 413 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 414 | Paloma Resources Inc | Roswell, NM 88201 | Oil & Gas Operator | Dec 1998 |
| 415 | Parallel Petroleum LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 416 | Parish Operating, LLC | Covington, LA 70433 | Oil & Gas Operator | Oct 2025 |
| 417 | Parrish, H Dwane & Rhonda K | Artesia, NM 88210 | Oil & Gas Operator | Apr 2022 |
| 418 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 419 | Pecos Operating Company, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2021 |
| 420 | Pecos Production Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2005 |
| 421 | Pendragon Energy Partners Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2009 |
| 422 | Pennzenergy Exploration And Production LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 423 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Oct 2025 |
| 424 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 425 | Percussion Petroleum Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2019 |
| 426 | Permex Petroleum Company, LLC | Dallas, TX 75201 | Oil & Gas Operator | Mar 2024 |
| 427 | Permian Resources Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 428 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 429 | Pete Mills | Midland, TX 79707 | Oil & Gas Operator | Oct 2012 |
| 430 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 431 | Petroleum Exploration Company LTD., Limited | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2025 |
| 432 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 433 | PHX Energy, LLC | Artesia, NM 88211 | Oil & Gas Operator | Sep 2025 |
| 434 | Pinon Petroleum, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Apr 2004 |
| 435 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 436 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 437 | Plantation Operating, LLC | Houston, TX 77041 | Oil & Gas Operator | Nov 2011 |
| 438 | Poco Resources LLC | Artesia, NM 88210 | Oil & Gas Operator | Jul 2024 |
| 439 | Pogo Oil & Gas Operating, Inc | Hobbs, NM 88240 | Oil & Gas Operator | Dec 2019 |
| 440 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 441 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 442 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 443 | Prairie Sun,Inc. | Roswell, NM 88201 | Oil & Gas Operator | Jun 2003 |
| 444 | Premier Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 445 | Premier Oil & Gas Inc | Richardson, TX 75083 | Oil & Gas Operator | Sep 2025 |
| 446 | Preston Exploration LLC | Spring, TX 77387 | Oil & Gas Operator | Dec 2014 |
| 447 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 448 | Primal Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2025 |
| 449 | Primero Operating, Inc. | Roswell, NM 88202 | Oil & Gas Operator | Jun 2022 |
| 450 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 451 | Probity Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | Jul 2014 |
| 452 | Pronghorn Management Corporation | Hobbs, NM 88241 | Oil & Gas Operator | Dec 2025 |
| 453 | Prospective Investment And Trading Co (The) | Tulsa, OK 741702320 | Oil & Gas Operator | Jun 2005 |
| 454 | Proven Petroleum, Inc. | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 455 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 456 | Purvis Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 457 | Quality Production Corp | Hobbs, NM BADADDR | Oil Operator | Jan 2002 |
| 458 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2025 |
| 459 | R & M Oil, LLC | Loco Hills, NM 882550011 | Oil & Gas Operator | May 2025 |
| 460 | R C Bennett Co | Midland, TX 79702 | Oil & Gas Operator | Jan 2019 |
| 461 | R S E Partners-I LP | Oklahoma City, OK 731025261 | Oil & Gas Operator | Feb 2000 |
| 462 | Ralph E Williamson | San Antonio, TX 78239 | Oil & Gas Operator | Dec 2013 |
| 463 | Range Operating New Mexico Inc | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2004 |
| 464 | Range Operating New Mexico LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2013 |
| 465 | Ranger 40 Petroleum, LLC | Fairfield, CT 06824 | Oil & Gas Operator | Dec 2025 |
| 466 | Raptor Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 467 | Ray Westall | Loco Hills, NM 88255 | Oil & Gas Operator | Sep 2012 |
| 468 | Ray Westall Operating, Inc. | Loco Hills, NM 88255 | Oil & Gas Operator | Oct 2025 |
| 469 | Raybaw Operating, LLC | Dallas, TX 75204 | Oil & Gas Operator | Sep 2025 |
| 470 | Read & Stevens, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2023 |
| 471 | Ready Oil & Gas | Artesia, NM 882110381 | Oil & Gas Operator | Dec 2007 |
| 472 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 473 | Redwood Operating LLC | Artesia, NM 88210 | Oil & Gas Operator | Dec 2023 |
| 474 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Dec 2025 |
| 475 | Reeves County Systems, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Aug 2019 |
| 476 | Regeneration Energy, Corporation | Artesia, NM 88210 | Oil & Gas Operator | Mar 2023 |
| 477 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 478 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 479 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 480 | Resaca Operating Company | Houston, TX 77010 | Oil & Gas Operator | Sep 2013 |
| 481 | Resource Rock Services, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2018 |
| 482 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 483 | Rhombus Operating Co., LTD | Littleton, CO 80160 | Oil & Gas Operator | Oct 2025 |
| 484 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 485 | Ridge Runner Resources Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 486 | Riley Permian Operating Co, LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Dec 2025 |
| 487 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 488 | Robert H Forrest Jr Oil LLC | Carlsbad, NM 88220 | Oil & Gas Operator | Jun 2025 |
| 489 | Robert N Enfield | Santa Fe, NM 87501 | Oil & Gas Operator | Nov 1997 |
| 490 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 491 | Robinson Oil Inc | Eunice, NM 88231 | Oil & Gas Operator | Jun 2015 |
| 492 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 493 | Roca Production, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 494 | Rockcliff Operating New Mexico LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2018 |
| 495 | Rodney B Webb Dba Webb Oil Co | Artesia, NM 88210 | Oil & Gas Operator | Jun 2005 |
| 496 | Rojo Grande LLC | Artesia, NM 882110248 | Oil Operator | Apr 2008 |
| 497 | Ronadero Company Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1996 |
| 498 | Roswell Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2019 |
| 499 | Roughhouse Operating, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2025 |
| 500 | Rover Operating, LLC | Chicago, IL 60606 | Oil & Gas Operator | Aug 2025 |