| 401 | Silberman A & M Oil | Oklahoma City, OK 73122-3096 | Oil & Gas Operator | Apr 2014 |
| 402 | Sneed Drilling Company | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2026 |
| 403 | Sneed William A Bill | Cleveland, OK 74020-1007 | Oil & Gas Operator | Apr 2026 |
| 404 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 405 | Sooner Exploration & Development Co Inc | Enid, OK 73702-3525 | Oil & Gas Operator | Oct 2023 |
| 406 | Sooner Pipe & Supply Corp | | Oil & Gas Operator | Nov 2004 |
| 407 | Southern Int'L Inc | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2007 |
| 408 | Southern Operating Corporation | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 409 | Southstar Oil And Gas Inc | Andover, KS 67002-0123 | Oil & Gas Operator | Jul 2020 |
| 410 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | Apr 2026 |
| 411 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 412 | Sparks Greg | Afton, OK 74331 | Oil & Gas Operator | Apr 2026 |
| 413 | Sparks Mick Oil Company Inc | Jennings, OK 74038-0250 | Oil & Gas Operator | Apr 2026 |
| 414 | Spears Terry | Osage, OK 74054 | Oil Operator | Mar 2026 |
| 415 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2026 |
| 416 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Apr 2026 |
| 417 | Stacy Operating LLC | Cushing, OK 74023 | Oil & Gas Operator | Apr 2026 |
| 418 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2026 |
| 419 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 420 | Stevens Quincy O | Oklahoma City, OK 73116-4102 | Oil & Gas Operator | Dec 2019 |
| 421 | Superior Oil & Gas LLC | Ringwood, OK 73768-9658 | Oil & Gas Operator | Mar 2026 |
| 422 | Swinea Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2015 |
| 423 | Tap Petroleum Inc | Cleveland, OK 74020-0054 | Oil & Gas Operator | Apr 2020 |
| 424 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2026 |
| 425 | Tarka Energy LLC | Houston, TX 77056-1940 | Oil & Gas Operator | Mar 2022 |
| 426 | Taylor International Inc | Drumright, OK 74030-1173 | Oil & Gas Operator | Mar 2020 |
| 427 | Taylor R Clark Exploration Inc | | Oil & Gas Operator | Aug 1992 |
| 428 | TC3 Operating Company | Dallas, TX 75248 | Oil & Gas Operator | Jul 1996 |
| 429 | Territory Resources LLC | Stillwater, OK 74074-1869 | Oil & Gas Operator | Apr 2026 |
| 430 | Terry John Trust | Aurora, CO 80012-5112 | Oil & Gas Operator | May 2016 |
| 431 | Terry Production Co | Stroud, OK 74079-0475 | Oil & Gas Operator | Aug 2008 |
| 432 | Terzan Energy II LLC | Chandler, OK 74834 | Oil & Gas Operator | Mar 2026 |
| 433 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 434 | Texasgulf Inc. | Newgulf, TX 77462 | Oil & Gas Operator | Jul 1994 |
| 435 | Texocan Minerals Inc | Tulsa, OK 74147 | Oil & Gas Operator | Dec 2000 |
| 436 | Thomas E L | Tulsa, OK 74136-6302 | Oil & Gas Operator | Feb 2015 |
| 437 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Mar 2026 |
| 438 | Three Sands Oil Inc | Perry, OK 73077 | Oil & Gas Operator | May 2023 |
| 439 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2026 |
| 440 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2026 |
| 441 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 442 | Triple B Resources | Barnsdall, OK 74002-9759 | Oil & Gas Operator | May 2014 |
| 443 | Tru Operating LLC | Denton, TX 76201 | Oil & Gas Operator | Apr 2023 |
| 444 | Tucker Gary & Deedee | Jennings, OK 74038 | Oil & Gas Operator | Jan 2026 |
| 445 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Jun 2026 |
| 446 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 447 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Apr 2026 |
| 448 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 449 | Vancol Oil Co Inc | Ponca City, OK 74602-0030 | Oil & Gas Operator | May 2018 |
| 450 | Victory Petroleum Inc | Tulsa, OK 74170-0354 | Oil & Gas Operator | May 2013 |
| 451 | Vintage Resources Inc | Lindsay, OK 73052-0285 | Oil Operator | Dec 2007 |
| 452 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 453 | W F D Oil Corp. | Edmond, OK 73012 | Oil & Gas Operator | Apr 2026 |
| 454 | W P Oil & Gas LLC | Coweta, OK 74429-5465 | Oil & Gas Operator | Mar 2015 |
| 455 | Wallace George C | Oklahoma City, OK 73120-0135 | Oil Operator | Nov 1994 |
| 456 | Ward Oil Co. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 457 | Warpath Energy Inc | Broken Arrow, OK 74014-1118 | Oil & Gas Operator | Apr 2018 |
| 458 | Warren Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2016 |
| 459 | Wave Energy LLC | Jennings, OK 74038 | Oil Operator | Apr 2026 |
| 460 | Welch Family LLC | Drumright, OK 74030 | Oil Operator | Apr 2026 |
| 461 | Welch Family Trust | Ada, OK 74820-9643 | Oil & Gas Operator | Apr 2015 |
| 462 | Wells Edward K | Sapulpa, OK 74066-4243 | Oil & Gas Operator | Jun 2004 |
| 463 | Westamerica Corporation | Dewey, OK 74029-0040 | Oil & Gas Operator | Aug 1999 |
| 464 | Western Petroleum Company Inc | Tulsa, OK 74170-2676 | Oil & Gas Operator | Apr 2020 |
| 465 | Westwind Exploration Company | Oklahoma City, OK 73123 | Oil & Gas Operator | Oct 1998 |
| 466 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 467 | White Star Petroleum LLC | Oklahoma City, OK 73116-7906 | Oil & Gas Operator | Dec 2025 |
| 468 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | Mar 2026 |
| 469 | Williams Kidd Drilling Corp | Claremore, OK 74017-0846 | Oil Operator | Jun 2013 |
| 470 | Wood Fay C Estate | Enid, OK 73703 | Oil & Gas Operator | Jun 2013 |
| 471 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2026 |
| 472 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Apr 2026 |
| 473 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 474 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Mar 2026 |
| 475 | Young Tommy Oil Inc | Woodward, OK 73802-0893 | Oil & Gas Operator | Mar 2026 |