| 401 | Parker & Parsley Dev LP | Irving, TX 75039-3745 | Oil & Gas Operator | Mar 2015 |
| 402 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 403 | Payne Exploration Company | Crescent, OK 73028 | Oil & Gas Operator | Dec 2024 |
| 404 | Penn VIrginia MC Operating Co LLC | Houston, TX 77084-7213 | Oil & Gas Operator | Dec 2024 |
| 405 | Pennzoil Company | Midland, TX 79710-0090 | Oil & Gas Operator | Mar 2000 |
| 406 | Pennzoil Explor & Prod Co | Houston, TX 77002 | Oil & Gas Operator | Mar 2000 |
| 407 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 408 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 409 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 410 | Petroleum Investment Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 411 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 412 | Petromark Energy LLC | Oklahoma City, OK 73116-7634 | Oil & Gas Operator | Jun 2000 |
| 413 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Mar 2025 |
| 414 | Philcon Development Co. | Amarillo, TX 79101 | Oil & Gas Operator | Sep 2014 |
| 415 | Pioneer Resources Prod LP | Irving, TX 75039-3745 | Oil & Gas Operator | Feb 2005 |
| 416 | Piper Operating LLC | Stigler, OK 74462 | Oil & Gas Operator | Jan 2025 |
| 417 | Pitco Production Company | Tulsa, OK 74170-2320 | Oil & Gas Operator | May 2013 |
| 418 | Plains Liquids Transport Inc | Houston, TX 77002 | Oil & Gas Operator | May 1996 |
| 419 | Plains Marketing & Trans Inc | Houston, TX 76002 | Oil & Gas Operator | Oct 1998 |
| 420 | Plains Marketing, LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 421 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 422 | Plymouth Exploration LLC | Tulsa, OK 74119-1031 | Oil & Gas Operator | Dec 2024 |
| 423 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 424 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Mar 2025 |
| 425 | Prentice Napier & Green Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2025 |
| 426 | Presidio Petroleum LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 427 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 428 | Primary Natural Resources III LLC | Tulsa, OK 74136-6351 | Oil & Gas Operator | Jan 2025 |
| 429 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 430 | Primary Natural Resources IV LLC | Tulsa, OK 74136-6351 | Oil & Gas Operator | Sep 2017 |
| 431 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 432 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 433 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 434 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2025 |
| 435 | Pyro Energy Corp | Kingwood, TX 77339-2102 | Oil & Gas Operator | Mar 1998 |
| 436 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 437 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2024 |
| 438 | Quarles Drilling Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2008 |
| 439 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 440 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 441 | R L Clampitt & Associates LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Jan 2025 |
| 442 | Rafter H Operating LLC | El Reno, OK 73036 | Oil & Gas Operator | Jan 2025 |
| 443 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 444 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 445 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 446 | Ratex Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2000 |
| 447 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 448 | Reading & Bates Petroleum Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 449 | Red Bluff Resources Operating LLC | Oklahoma City, OK 73112-5468 | Oil & Gas Operator | Dec 2024 |
| 450 | Red Wolf Operating LLC | Edmond, OK 73003-2179 | Oil & Gas Operator | Jan 2025 |
| 451 | Redline Energy LLC | Dover, OK 73734 | Oil & Gas Operator | Jan 2025 |
| 452 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 453 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |
| 454 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 455 | Resources Operating Co Inc | Enid, OK 73703-1628 | Oil & Gas Operator | Dec 2024 |
| 456 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Dec 2024 |
| 457 | Reynolds J W & Associates | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2000 |
| 458 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 459 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 460 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 461 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 462 | Rimrock Resource Operating LLC | Tulsa, OK 74103-4462 | Oil & Gas Operator | Dec 2024 |
| 463 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 464 | Rja Energy LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Jan 2025 |
| 465 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Jan 2025 |
| 466 | RMS Monte Christo, LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Mar 2023 |
| 467 | Rockwell Energy Corporation | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2014 |
| 468 | Rocky Roads Operating LLC | Tulsa, OK 74103-4048 | Oil & Gas Operator | Jan 2025 |
| 469 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 470 | Rover Operating, LLC | Chicago, IL 60606 | Oil & Gas Operator | Jan 2025 |
| 471 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Mar 2025 |
| 472 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Nov 2024 |
| 473 | Rush-Andrus Engineering | Royse City, TX 75189-1210 | Oil & Gas Operator | Feb 2022 |
| 474 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Dec 2024 |
| 475 | S & G Operating LLC | McLoud, OK 74851 | Oil & Gas Operator | Jan 2025 |
| 476 | S & S Oil & Gas Corporation | Okemah, OK 74859-0659 | Oil & Gas Operator | Sep 2014 |
| 477 | S & S Star Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 478 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 479 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 480 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 481 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 482 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Mar 2025 |
| 483 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 484 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 485 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 486 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 487 | Santa Rita Resources Inc & Subs | | Oil & Gas Operator | Mar 2015 |
| 488 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 489 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 490 | Scarth Oil & Gas Co | Amarillo, TX 79101 | Oil & Gas Operator | Feb 1999 |
| 491 | Schell Sam H | Barnsdall, OK 74002 | Oil & Gas Operator | Aug 1999 |
| 492 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 493 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 494 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 495 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 496 | Sequent Exploration Inc | | Oil & Gas Operator | Oct 2017 |
| 497 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 498 | Shoreline Operating LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2025 |
| 499 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 500 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Dec 2024 |