| 501 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 502 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Feb 2025 |
| 503 | Staghorn Petroleum LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jan 2025 |
| 504 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 505 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2025 |
| 506 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2025 |
| 507 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 508 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 509 | Stillwater Oil & Gas | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 510 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2025 |
| 511 | STP Cherokee, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 512 | STP Newco Inc | Oklahoma City, OK 73102-5641 | Oil & Gas Operator | Jul 2021 |
| 513 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 514 | Stride Energy LLC | Piedmont, OK 73078 | Oil & Gas Operator | Feb 2025 |
| 515 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 516 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2025 |
| 517 | Sun Refining & Marketing | Philadelphia, PA 19103 | Oil & Gas Operator | Jul 2015 |
| 518 | Sundance Energy Oklahoma LLC Dba Seo LLC | Denver, CO 80202-3620 | Oil & Gas Operator | Nov 2021 |
| 519 | Sundance Operating Co | | Oil & Gas Operator | Jul 2016 |
| 520 | Sunoco Partners MKT & Terminal | Tulsa, OK 74102-2039 | Oil & Gas Operator | Jan 2019 |
| 521 | Sunrise Energy Co | Dallas, TX 75206 | Oil & Gas Operator | Aug 1993 |
| 522 | Superior Oil & Gas LLC | Ringwood, OK 73768-9658 | Oil & Gas Operator | Feb 2025 |
| 523 | Superior Production LLC | Ringwood, OK 73768 | Oil & Gas Operator | Feb 2025 |
| 524 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Jan 2025 |
| 525 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 526 | T B K Energy Company | New Braunfels, TX 78130 | Oil & Gas Operator | Feb 2025 |
| 527 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 528 | Tallgrass Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 529 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2025 |
| 530 | TC Energy LLC | Covington, OK 73730-2116 | Oil & Gas Operator | Sep 2014 |
| 531 | Te-Ray Energy, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Jan 2025 |
| 532 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2025 |
| 533 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2025 |
| 534 | Tex-Star Production | Dallas, TX 75206 | Oil & Gas Operator | Feb 2025 |
| 535 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 536 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 537 | Texasgulf Inc. | Newgulf, TX 77462 | Oil & Gas Operator | Jul 1994 |
| 538 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 539 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Jan 2025 |
| 540 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 541 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Apr 2025 |
| 542 | Tilley Oil Inc | Velma, OK 73491 | Oil & Gas Operator | Feb 2025 |
| 543 | Token Operating, LLC | Enid, OK 73703-1094 | Oil Operator | Feb 2025 |
| 544 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2025 |
| 545 | Toklan Oil Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 546 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 547 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Feb 2025 |
| 548 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 549 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jan 2025 |
| 550 | Tri-Unity Inc | Sand Springs, OK 74063-4401 | Oil & Gas Operator | Jun 2009 |
| 551 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Feb 2025 |
| 552 | Triplett Larry W | Oklahoma City, OK 73112-5325 | Oil & Gas Operator | Mar 2015 |
| 553 | Triumph Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2015 |
| 554 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Feb 2025 |
| 555 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 556 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 557 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 558 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 559 | Union Texas Products Corp | Houston, TX 77252 | Oil & Gas Operator | Nov 1994 |
| 560 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 561 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 562 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2025 |
| 563 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 564 | Valjohn Energy Corporation | Oklahoma City, OK 73142-6090 | Oil & Gas Operator | Jan 2025 |
| 565 | Viersen & Cochran Drilling Company | | Oil & Gas Operator | May 2015 |
| 566 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Jan 2025 |
| 567 | VRC Oil & Gas Operating Co | Oklahoma City, OK 73116-1431 | Oil & Gas Operator | Jun 2019 |
| 568 | W C S Inc | Pottsboro, TX 75076 | Oil & Gas Operator | Oct 2019 |
| 569 | Waggoner Oil & Gas Corp | Enid, OK 73703-1152 | Oil & Gas Operator | Feb 2025 |
| 570 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 571 | Ward Oil Company An Okla Corp | McAlester, OK 74501 | Oil & Gas Operator | Feb 1993 |
| 572 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Jan 2025 |
| 573 | Watkins J L | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 574 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Jan 2025 |
| 575 | Wentworth Operating Company | Oklahoma City, OK 73162-1863 | Oil & Gas Operator | Feb 2025 |
| 576 | Western Division Investments Inc | Enid, OK 73701 | Oil & Gas Operator | Jul 2021 |
| 577 | Western Gas Resources Inc | Denver, CO 80202-1955 | Oil & Gas Operator | Dec 2007 |
| 578 | Western Mountain Resources LLC | Cogan Station, PA 17728 | Oil & Gas Operator | Jan 2025 |
| 579 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 580 | WFD Oil Corporation | Edmond, OK 73012-0619 | Oil & Gas Operator | Jan 2025 |
| 581 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Feb 2025 |
| 582 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Feb 2025 |
| 583 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 584 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 585 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 586 | Wimberley James A | Dallas, TX 75229-6180 | Oil & Gas Operator | Nov 2014 |
| 587 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2024 |
| 588 | Wise James W | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 1996 |
| 589 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Feb 2025 |
| 590 | Wood Fay C Estate | Enid, OK 73703 | Oil & Gas Operator | Jun 2013 |
| 591 | Woolsey Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2024 |
| 592 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 593 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 594 | Young H Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 1993 |
| 595 | Zeiders Bros Oil & Gas Co LLC | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |