| 501 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 502 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Jun 2026 |
| 503 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 504 | Primrose Jimmie | | Oil Operator | Feb 1998 |
| 505 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 506 | Pringle Operating Co. | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2015 |
| 507 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 508 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 509 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2026 |
| 510 | Quail Creek Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 511 | Quail Creek Petro MGMT Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 512 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Mar 2026 |
| 513 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 514 | R & B Operating LLC | Boynton, OK 74422 | Oil & Gas Operator | Mar 2025 |
| 515 | R & B Trucking | Crescent, OK 73028-0775 | Oil & Gas Operator | Nov 2021 |
| 516 | R B Energy Inc | Manchester, KY 40962 | Oil & Gas Operator | Jan 2015 |
| 517 | R L Clampitt & Associates LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2026 |
| 518 | R.D. Oil Company | Austin, TX 78755 | Oil & Gas Operator | Jun 2026 |
| 519 | R3 Resources Operating Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Apr 2026 |
| 520 | Rafter H Operating LLC | El Reno, OK 73036 | Oil & Gas Operator | Mar 2026 |
| 521 | Rainbo Service Company | Oklahoma City, OK 73129 | Oil & Gas Operator | Mar 2026 |
| 522 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 523 | Ramco Energy Corporation | FT. Lauderdale, FL 33312 | Oil & Gas Operator | Dec 2008 |
| 524 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 525 | Ramsey Property Management LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2026 |
| 526 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 527 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2026 |
| 528 | Ray G H Oil Company | Chickasha, OK 73023-0650 | Oil Operator | Feb 2010 |
| 529 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 530 | RDH Enterprises Inc | El Reno, OK 73036 | Oil & Gas Operator | May 2015 |
| 531 | Real Production Management LLC | Tulsa, OK 74103 | Oil Operator | Oct 2025 |
| 532 | Red Hawk Resources Inc | Edmond, OK 73003-3207 | Oil & Gas Operator | Apr 2026 |
| 533 | Red River Oil & Gas Company | Oklahoma City, OK 73132-5120 | Oil & Gas Operator | Mar 2015 |
| 534 | Red Wolf Operating LLC | Edmond, OK 73003-2179 | Oil & Gas Operator | Apr 2026 |
| 535 | Revolution Operating Company,LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2024 |
| 536 | Revolution Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2023 |
| 537 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2026 |
| 538 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 539 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 540 | Rif Raf Inc | Norman, OK 73069 | Oil Operator | May 1999 |
| 541 | Rimrock Resource Operating LLC | Tulsa, OK 74103-4462 | Oil & Gas Operator | Apr 2026 |
| 542 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 543 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Apr 2026 |
| 544 | RL&B Energy LLC | Wichita Falls, TX 76230 | Oil & Gas Operator | Mar 2026 |
| 545 | RMS Monte Christo, LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Mar 2023 |
| 546 | Robertson Johnie J | Okmulgee, OK 74447-8765 | Oil & Gas Operator | Mar 2026 |
| 547 | Robinson Brothers Drilling Co | | Oil & Gas Operator | Jul 2002 |
| 548 | Rockwell Energy Corporation | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2014 |
| 549 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 550 | Roka Management Inc | Oklahoma City, OK 73139 | Oil & Gas Operator | Apr 2026 |
| 551 | Rox Exploration Inc | Norman, OK 73069-6301 | Oil & Gas Operator | Apr 2026 |
| 552 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Jun 2026 |
| 553 | Rush-Andrus Engineering | Royse City, TX 75189-1210 | Oil & Gas Operator | Feb 2022 |
| 554 | S & G Operating LLC | McLoud, OK 74851 | Oil & Gas Operator | Apr 2026 |
| 555 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 556 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 557 | Salty Dog Disposal LLC | Cement, OK 73017 | Oil Operator | Apr 2026 |
| 558 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 559 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 560 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2026 |
| 561 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Feb 2026 |
| 562 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jun 2026 |
| 563 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2026 |
| 564 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 565 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 566 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 567 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 568 | Santa Rita Resources Inc & Subs | | Oil & Gas Operator | Mar 2015 |
| 569 | Saucier Oil & Gas LLC | Cement, OK 73017 | Oil Operator | Mar 2026 |
| 570 | Saylor Weldon W | Tulsa, OK 74105-5325 | Gas Operator | Dec 1994 |
| 571 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 572 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 573 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 574 | Scott Petroleum, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 1995 |
| 575 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 576 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 577 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 578 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 579 | Seals Oil Company | Fox, OK 73435-0222 | Oil & Gas Operator | Nov 2011 |
| 580 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 581 | Sharber Billy Jack Operating | Konawa, OK 74849-0071 | Oil & Gas Operator | Mar 2015 |
| 582 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 583 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2026 |
| 584 | Shoreline Operating LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 2026 |
| 585 | Simmons Mack McCoy | Cement, OK 73017 | Oil Operator | Feb 2025 |
| 586 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2026 |
| 587 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 588 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 589 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Mar 2026 |
| 590 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Jun 2026 |
| 591 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 592 | Sooner Pipe & Supply Corp | | Oil & Gas Operator | Nov 2004 |
| 593 | Sorrels J R Dba Cheyenne Oil Properties | Ponca City, OK 74601 | Oil & Gas Operator | Jul 2022 |
| 594 | Southwest Energy LP | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 595 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Apr 2026 |
| 596 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Apr 2026 |
| 597 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Jun 2026 |
| 598 | Spring Operating Company | Edmond, OK 73034 | Oil & Gas Operator | Apr 2026 |
| 599 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 600 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Apr 2026 |