| 501 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 502 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 503 | Paloma Operating Co Inc | Houston, TX 77002-5220 | Oil & Gas Operator | Jul 2025 |
| 504 | Paluca Petroleum Inc | Holdenville, OK 74848 | Oil & Gas Operator | Nov 2025 |
| 505 | Panada Exploration, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1996 |
| 506 | Panadero Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 2002 |
| 507 | Panenergy Services Inc | Houston, TX 77525 | Oil & Gas Operator | May 2001 |
| 508 | Panhandle Oil & Gas Consultants Inc | Woodward, OK 73802-5011 | Oil & Gas Operator | Jul 2015 |
| 509 | Panther Energy Company, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2022 |
| 510 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 511 | Park Avenue Exploration Corp | Oklahoma City, OK 73102-5604 | Oil & Gas Operator | Sep 2011 |
| 512 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 513 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 514 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 515 | Payne Exploration Company | Crescent, OK 73028 | Oil & Gas Operator | Nov 2025 |
| 516 | Pearl Oil Company | Nichols Hills, OK 73120-1408 | Oil & Gas Operator | Nov 2023 |
| 517 | Pedestal Oil Company Inc | Oklahoma City, OK 73101-1522 | Oil & Gas Operator | May 2019 |
| 518 | Pegasus Energy Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Mar 2015 |
| 519 | Penn Homa Oil & Gas Co | Edmond, OK 73083 | Oil & Gas Operator | Oct 2013 |
| 520 | Penn VIrginia MC Operating Co LLC | Houston, TX 77084-7213 | Oil & Gas Operator | Sep 2025 |
| 521 | Pet-Ex Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 522 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 523 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 524 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 525 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 526 | Petroleum Investment Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 527 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 528 | Petromark Energy LLC | Oklahoma City, OK 73116-7634 | Oil & Gas Operator | Jun 2000 |
| 529 | Piper Operating LLC | Stigler, OK 74462 | Oil & Gas Operator | Nov 2025 |
| 530 | Pitco Production Company | Tulsa, OK 74170-2320 | Oil & Gas Operator | May 2013 |
| 531 | Plainsmen Energy LLC | Enid, OK 73703-5747 | Oil & Gas Operator | Dec 2025 |
| 532 | Plymouth Exploration LLC | Tulsa, OK 74119-1031 | Oil & Gas Operator | Dec 2025 |
| 533 | Positive Energy LLC | Ada, OK 74820 | Oil & Gas Operator | Dec 2025 |
| 534 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 535 | Post Petroleum Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2013 |
| 536 | Premier Resources LTD | Denver, CO 80237 | Oil & Gas Operator | Jul 2002 |
| 537 | Prenalta Corporation | Terrytown, NY 10591 | Oil & Gas Operator | Jan 1997 |
| 538 | Prentice, Napier & Green, Inc. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 539 | Presidio Petroleum LLC | Canadian, TX 79014 | Oil & Gas Operator | Feb 2026 |
| 540 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2026 |
| 541 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 542 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 543 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Feb 2026 |
| 544 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 545 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 546 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 547 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Nov 2025 |
| 548 | Providence Oil & Gas Corp | Tulsa, OK 74135-5463 | Oil & Gas Operator | May 2005 |
| 549 | Pruitt L Oil Properties | Oklahoma City, OK 73162-7758 | Oil & Gas Operator | Dec 2000 |
| 550 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 551 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 552 | Quail Creek Petro MGMT Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 553 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Nov 2025 |
| 554 | Quarles Drilling Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2008 |
| 555 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2026 |
| 556 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 557 | R & L Properties Inc | Richmond, MO 64085-0228 | Oil & Gas Operator | Apr 2001 |
| 558 | R3 Resources Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Nov 2025 |
| 559 | Rafter H Operating LLC | El Reno, OK 73036 | Oil & Gas Operator | Nov 2025 |
| 560 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 561 | Rambler Oil Co | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1999 |
| 562 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 563 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Dec 2025 |
| 564 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 565 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 566 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2025 |
| 567 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 568 | Raven Resources LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Nov 2025 |
| 569 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 570 | Rebellion Energy LLC | Tulsa, OK 74135-6241 | Oil & Gas Operator | Jun 2022 |
| 571 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 572 | Red Hawk Resources Inc | Edmond, OK 73003-3207 | Oil & Gas Operator | Dec 2025 |
| 573 | Red Wolf Operating LLC | Edmond, OK 73003-2179 | Oil & Gas Operator | Dec 2025 |
| 574 | Redland Resources LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Dec 2025 |
| 575 | Redline Energy LLC | Dover, OK 73734 | Oil & Gas Operator | Dec 2025 |
| 576 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 577 | Reeder Energy Operating LLC | Dallas, TX 75206-4085 | Oil & Gas Operator | Dec 2021 |
| 578 | Reign Operating LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2025 |
| 579 | Republic Resources Corporation | Oklahoma City, OK 73102-3081 | Oil & Gas Operator | May 2021 |
| 580 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |
| 581 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 582 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Nov 2025 |
| 583 | Richland Energy Corporation | Tulsa, OK 74103-4441 | Oil Operator | Jul 1995 |
| 584 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 585 | Rimrock Resource Operating LLC | Tulsa, OK 74103-4462 | Oil & Gas Operator | Nov 2025 |
| 586 | Rio Blanco Operating LLC | Victoria, TX 77904 | Oil & Gas Operator | Nov 2025 |
| 587 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 588 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Dec 2025 |
| 589 | Robson & Shults Prod Corp | Mannford, OK 74044 | Oil & Gas Operator | Jun 1995 |
| 590 | Rockford Energy Partners III,LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2012 |
| 591 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 592 | Rox Exploration Inc | Norman, OK 73069-6301 | Oil & Gas Operator | Nov 2025 |
| 593 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Feb 2026 |
| 594 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 595 | Rush-Andrus Engineering | Royse City, TX 75189-1210 | Oil & Gas Operator | Feb 2022 |
| 596 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Nov 2025 |
| 597 | S & G Operating LLC | McLoud, OK 74851 | Oil & Gas Operator | Nov 2025 |
| 598 | S & H Tank Service Of Okla | Lindsay, OK 73052 | Oil & Gas Operator | Mar 2017 |
| 599 | S & S Star Operating, LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 600 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |