| 501 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 502 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 503 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Feb 2024 |
| 504 | RL&B Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 505 | Roberts & Murphy, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Apr 2016 |
| 506 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 507 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 508 | Royalty Energy Development LLC | Edmond, OK 73083 | Oil & Gas Operator | Feb 2024 |
| 509 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | May 2024 |
| 510 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Feb 2024 |
| 511 | Ryan Petroleum Corp | Oklahoma City, OK 73102-9024 | Oil & Gas Operator | Aug 1994 |
| 512 | S A C Operating Inc | Woodward, OK 73802-1749 | Oil & Gas Operator | Jan 1999 |
| 513 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2024 |
| 514 | Salty Dog Disposal LLC | | Oil Operator | Mar 2024 |
| 515 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Mar 2024 |
| 516 | Samson Gas Producing Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 517 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 518 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 519 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 520 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2024 |
| 521 | Savoy Energy LP | Traverse City, MI 49685-1560-1560 | Oil & Gas Operator | Feb 2024 |
| 522 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | May 2024 |
| 523 | Seabren Gas System Inc | Okla City, OK 73112 | Oil & Gas Operator | Mar 2016 |
| 524 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 525 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 526 | Seaport Inc | Edmond, OK 73083-5646 | Oil & Gas Operator | Feb 2024 |
| 527 | Sec Production Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Feb 2024 |
| 528 | Senax Inc | Tulsa, OK 74105-2206 | Oil & Gas Operator | Jan 2024 |
| 529 | Shar Alan Oil Company | | Oil & Gas Operator | Oct 2005 |
| 530 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 531 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 532 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2024 |
| 533 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | May 2024 |
| 534 | Sho-Bar Energy, Inc. | Harper, KS 67058 | Oil & Gas Operator | Jan 2024 |
| 535 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2024 |
| 536 | Singer Fleischaker Oil Op. Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 537 | Singer Oil Co LLC | Hennessey, OK 73742-0307 | Oil & Gas Operator | Feb 2024 |
| 538 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2024 |
| 539 | Sloan Petroleum Service Inc | Edmond, OK 73003-0018 | Oil & Gas Operator | Feb 2024 |
| 540 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | May 2024 |
| 541 | Smith Edward F | Avant, OK 74001-0024 | Oil & Gas Operator | Nov 2014 |
| 542 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 543 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 544 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Feb 2024 |
| 545 | South Forty, The, Inc. | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 546 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 547 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 548 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 549 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | May 2024 |
| 550 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Feb 2024 |
| 551 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | May 2024 |
| 552 | Spring Operating Company | Edmond, OK 73083-2048 | Oil & Gas Operator | Feb 2024 |
| 553 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | May 2024 |
| 554 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 555 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 556 | Staab Alan R | Tulsa, OK 74114-4213 | Oil & Gas Operator | Sep 2010 |
| 557 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 558 | Statex Operating, LLC | Dallas, TX 75229 | Oil & Gas Operator | Mar 2007 |
| 559 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 560 | Stephens Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Feb 2024 |
| 561 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 562 | Stone Oak Operating, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2024 |
| 563 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 564 | Stricker Resources Inc | Okmulgee, OK 74447-0773 | Oil & Gas Operator | Nov 2023 |
| 565 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 566 | Sun Refining & Marketing | Philadelphia, PA 19103 | Oil & Gas Operator | Jul 2015 |
| 567 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | May 2024 |
| 568 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jan 2024 |
| 569 | Sunoco Partners MKT & Terminal | Tulsa, OK 74102-2039 | Oil & Gas Operator | Jan 2019 |
| 570 | Sunrise Energy Co | Dallas, TX 75206 | Oil & Gas Operator | Aug 1993 |
| 571 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 572 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | May 2024 |
| 573 | Superior Saltwater Disposal LLC | | Oil & Gas Operator | Dec 2016 |
| 574 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Jan 2024 |
| 575 | T & S Mud Disposal LLC | Lindsay, OK 73052-0754 | Oil Operator | Mar 2013 |
| 576 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 577 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2024 |
| 578 | Taylor R C Companies Inc | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2021 |
| 579 | Te-Ray Energy, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Jan 2024 |
| 580 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2024 |
| 581 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Feb 2024 |
| 582 | Tex-Ok Energy LP | Cody, WY 82414-5915 | Oil & Gas Operator | Mar 2024 |
| 583 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 584 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Jan 2024 |
| 585 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 586 | Texas Southwest Gas LLC | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2022 |
| 587 | The Quintin Little Company Inc | Ardmore, OK 73402-1509 | Oil & Gas Operator | Feb 2024 |
| 588 | Three-D Resources, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Jan 2024 |
| 589 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 590 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 591 | Tiger Trucks Inc | Seminole, OK 74868 | Oil & Gas Operator | Feb 2024 |
| 592 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Mar 2024 |
| 593 | Todd John C | Oklahoma City, OK 73112-8049 | Oil & Gas Operator | May 2015 |
| 594 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 595 | Toklan Oil Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 596 | Tonys Crude Oil Reclaiming Plant Inc | | Oil Operator | Jan 2024 |
| 597 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 598 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 599 | Total Petroleum Inc | Denver, CO 80201-0500 | Oil & Gas Operator | Nov 2006 |
| 600 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |