| 401 | R & S Oil Company | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2013 |
| 402 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2024 |
| 403 | Rains And Williamson Oil Co. | Wichita, KS 67277 | Oil & Gas Operator | Jan 2024 |
| 404 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 405 | Ramsey Nichols Operating Company LLC | | Oil & Gas Operator | Feb 2024 |
| 406 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Jan 2024 |
| 407 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 408 | RDH Enterprises, Inc. | El Reno, OK 73036 | Oil & Gas Operator | May 2015 |
| 409 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 410 | Red Hawk Disposal LLC | | Oil Operator | Jun 2023 |
| 411 | Remora Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | May 2024 |
| 412 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 413 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2024 |
| 414 | Richard Charles J | | Oil & Gas Operator | May 1996 |
| 415 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 416 | Riley Lee Roy | Chickasha, OK 73018-9306 | Oil & Gas Operator | May 2006 |
| 417 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 418 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Feb 2024 |
| 419 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 420 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Feb 2024 |
| 421 | S & G Operating LLC | Kingfisher, OK 73750-0256 | Oil & Gas Operator | Feb 2024 |
| 422 | S O S Recovery Inc | Enid, OK 73703-2403 | Oil & Gas Operator | Jul 2023 |
| 423 | S T Industries Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2011 |
| 424 | Salt Fork Producers Inc | Pond Creek, OK 73766 | Oil & Gas Operator | Jan 1995 |
| 425 | Salt Plain Pipeline Corp | Edmond, OK 73013 | Oil & Gas Operator | Jun 2010 |
| 426 | Salty Dog Disposal LLC | | Oil Operator | Mar 2024 |
| 427 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 428 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2024 |
| 429 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 430 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2024 |
| 431 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 432 | Semcrude LP | | Oil & Gas Operator | Jul 2008 |
| 433 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 434 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 435 | Shaw Thomas P | Tulsa, OK 74105-7327 | Oil & Gas Operator | Mar 2015 |
| 436 | Silberman A & M Oil | Oklahoma City, OK 73122-3096 | Oil & Gas Operator | Apr 2014 |
| 437 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2024 |
| 438 | Singer Oil Co LLC | Hennessey, OK 73742-0307 | Oil & Gas Operator | Feb 2024 |
| 439 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Jan 2024 |
| 440 | SK Plymouth LLC | | Oil & Gas Operator | Jan 2024 |
| 441 | Sloan Petroleum Service Inc | Edmond, OK 73003-0018 | Oil & Gas Operator | Feb 2024 |
| 442 | SNR Operating, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2024 |
| 443 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Feb 2024 |
| 444 | Southern Star Central Gas Pipeline, Inc. | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2023 |
| 445 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | Feb 2024 |
| 446 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 447 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | May 2024 |
| 448 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Feb 2024 |
| 449 | Spring Operating Company | Edmond, OK 73083-2048 | Oil & Gas Operator | Feb 2024 |
| 450 | Spring Valley Oil & Gas Inc | Drummond, OK 73735-0175 | Oil & Gas Operator | Feb 2024 |
| 451 | Squirrel Oil & Gas Inc | Blackwell, OK 74631-0248 | Oil & Gas Operator | Mar 2022 |
| 452 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 453 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2024 |
| 454 | Stillwater Oil & Gas | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 455 | STP Cherokee, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 456 | STP Newco Inc | Oklahoma City, OK 73102-5641 | Oil & Gas Operator | Jul 2021 |
| 457 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 458 | Summa Engineering Inc | Oklahoma City, OK 73112-3624 | Oil & Gas Operator | Mar 2015 |
| 459 | Sun Refining & Marketing | Philadelphia, PA 19103 | Oil & Gas Operator | Jul 2015 |
| 460 | Sundance Operating Co | | Oil & Gas Operator | Jul 2016 |
| 461 | Sunoco Partners MKT & Terminal | Tulsa, OK 74102-2039 | Oil & Gas Operator | Jan 2019 |
| 462 | Superior Oil & Gas LLC | Ringwood, OK 73768-9658 | Oil & Gas Operator | Feb 2024 |
| 463 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 464 | Superior Saltwater Disposal LLC | | Oil & Gas Operator | Dec 2016 |
| 465 | Supplyco Inc | Perry, OK 73077 | Oil & Gas Operator | Apr 2014 |
| 466 | Swenton, Michael J. | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2024 |
| 467 | T & S Mud Disposal LLC | Lindsay, OK 73052-0754 | Oil Operator | Mar 2013 |
| 468 | T B K Energy Company | | Oil & Gas Operator | Feb 2024 |
| 469 | Tag Team Resources LLC | Eufaula, OK 74432-0841 | Oil & Gas Operator | Jan 2024 |
| 470 | Tallgrass Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | May 2024 |
| 471 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 472 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2024 |
| 473 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Feb 2024 |
| 474 | Territory Resources LLC | Stillwater, OK 74074-1869 | Oil & Gas Operator | Feb 2024 |
| 475 | Tessera Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 476 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Jan 2024 |
| 477 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 478 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 479 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | May 2024 |
| 480 | Three Sands Investment Company | Waukomis, OK 73773-0370 | Oil & Gas Operator | Jan 2024 |
| 481 | Tiger Trucks Inc | Seminole, OK 74868 | Oil & Gas Operator | Feb 2024 |
| 482 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Mar 2024 |
| 483 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 484 | Tonys Crude Oil Reclaiming Plant Inc | | Oil Operator | Jan 2024 |
| 485 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 486 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 487 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 488 | Tri-State Pipeline Service Inc | Ninnekah, OK 73067-0189 | Oil & Gas Operator | Mar 2011 |
| 489 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Feb 2024 |
| 490 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 491 | Triple C Properties Inc | Seminole, OK 74818-0481 | Oil & Gas Operator | Jun 2023 |
| 492 | Trout Disposal Well Inc | Hammon, OK 73650-0292 | Oil & Gas Operator | Jul 2016 |
| 493 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Feb 2024 |
| 494 | Turner Resources Inc | Hennessey, OK 73742-0775 | Oil & Gas Operator | Jan 2024 |
| 495 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 496 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 497 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 498 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 499 | Union Texas Products Corp | Houston, TX 77252 | Oil & Gas Operator | Nov 1994 |
| 500 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Feb 2024 |