| 601 | Subsurface Energy, Inc. | | Oil & Gas Operator | Oct 2015 |
| 602 | Sugar Rock Incorporated | | Oil & Gas Operator | Dec 2021 |
| 603 | Summers Petroleum Inc | | Oil & Gas Operator | Dec 2002 |
| 604 | Summit Appalachia Operating Company, LLC | | Gas Operator | Dec 2021 |
| 605 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 606 | SWN Production (Ohio), LLC | Morgantown, WV 26508 | Oil & Gas Operator | Mar 2024 |
| 607 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Nov 2025 |
| 608 | SWV Energy Operating LLC | Spring, TX 77379 | Gas Operator | Dec 2018 |
| 609 | Syndex Resources, Inc. | Wellesley, MA 02181-000 | Oil & Gas Operator | Dec 2021 |
| 610 | Synergy Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Nov 2019 |
| 611 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2025 |
| 612 | T.O.F., Inc. | | Oil & Gas Operator | Dec 2002 |
| 613 | Tapo Energy, LLC | West Union, WV 26456 | Oil & Gas Operator | Dec 2021 |
| 614 | Targa Development, Inc. | Clarksburg, WV 26301-0000 | Oil & Gas Operator | Dec 2021 |
| 615 | Tate Gas Company | Glenville, WV 26351-0000 | Oil & Gas Operator | Dec 2021 |
| 616 | Taylor, W H | | Gas Operator | Dec 2004 |
| 617 | Teavee Oil & Gas, Inc. | Charleston, WV 25301-0000 | Oil & Gas Operator | Dec 2021 |
| 618 | Tedik Limited Partnership | Williamson, WV 25661-0000 | Gas Operator | Dec 2021 |
| 619 | Ten A Coal Company | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2020 |
| 620 | Tender Equity Corporation | Marietta, OH 45750 | Oil & Gas Operator | Dec 2007 |
| 621 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 622 | Tenmile Land Limited Liability Company | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2021 |
| 623 | Term Energy Corp. | Harrisville, WV 26362-0000 | Oil & Gas Operator | Dec 2021 |
| 624 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 625 | The Calvert Company | Oklahoma City, OK 73154-1589 | Oil & Gas Operator | Dec 2021 |
| 626 | The Glass Development Company | St. Marys, WV 26170-0000 | Oil & Gas Operator | Dec 2021 |
| 627 | Thomas Oil Company | | Oil & Gas Operator | Dec 2008 |
| 628 | Tiger Oil, Inc. | Canal Wincheste, OH 43110 | Oil & Gas Operator | Dec 2007 |
| 629 | TNG, Inc. | | Oil & Gas Operator | Dec 1996 |
| 630 | Toney Branch Gas Company | Huntington, WV 25702-0086 | Gas Operator | Dec 2021 |
| 631 | Tower Drilling Corporation | | Oil & Gas Operator | Dec 2021 |
| 632 | Trans Energy, Inc. | St. Marys, WV 26170 | Oil & Gas Operator | Dec 2017 |
| 633 | Tri-County Oil & Gas, Inc. | Fairmont, WV 26555-0000 | Oil & Gas Operator | Dec 2019 |
| 634 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Nov 2025 |
| 635 | Triad Hunter, LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2021 |
| 636 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 637 | Tribune Resources, LLC | | Oil & Gas Operator | Dec 2021 |
| 638 | Trio Oil And Gas Company | Salem, WV 26426 | Oil & Gas Operator | Nov 2021 |
| 639 | Trio Petroleum Corp. | Glenville, WV 26351-0880 | Oil & Gas Operator | Jul 2016 |
| 640 | Trittipo, J. L. | | Oil & Gas Operator | Nov 1997 |
| 641 | Tucker, Gene | | Oil & Gas Operator | Dec 2011 |
| 642 | Tug Fork Development | Catlettsburg, KY 41129 | Gas Operator | Dec 2021 |
| 643 | Tug Hill Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2021 |
| 644 | Tuscany Gas Limited Liability Company | | Gas Operator | Dec 2021 |
| 645 | Ultra Production Company, LLC | Cedar Bluff, VA 24609 | Gas Operator | Oct 2014 |
| 646 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 647 | Underwood, Donald D. Dba Mustang Oil Co | Salem, WV 26426 | Oil & Gas Operator | Dec 2020 |
| 648 | Union Gas Corp. (Union Gas Co.) | Charleston, WV 25338-0000 | Oil & Gas Operator | Aug 2021 |
| 649 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 650 | United Operating Company | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 651 | United Petro LTD. | | Oil & Gas Operator | Dec 2018 |
| 652 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 653 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 654 | Vescal Corporation | Elizabeth, WV 26143-0000 | Oil & Gas Operator | Dec 2017 |
| 655 | Viking Energy Corporation | Odessa, TX 79760 | Oil & Gas Operator | Dec 2021 |
| 656 | Viking International Resources Co., Inc. | | Oil & Gas Operator | Dec 2020 |
| 657 | Virtex Eastern Producing Co., LLC | | Gas Operator | Dec 2021 |
| 658 | W. E. B. Well Tending Service, Inc. | Vienna, WV 26105 | Oil & Gas Operator | Nov 2011 |
| 659 | Waco Oil & Gas Co., Inc. | Glenville, WV 26351-0397 | Oil & Gas Operator | Dec 2021 |
| 660 | Walker Gas Company | Romney, WV 25757-0000 | Oil & Gas Operator | Dec 2018 |
| 661 | Walker Oil And Gas Inc | | Oil & Gas Operator | Jun 2021 |
| 662 | Walker Well Service Inc | Big Bend, WV 26136-0000 | Oil & Gas Operator | Dec 2021 |
| 663 | Warfield Management, LLC | Newman, GA 30263 | Gas Operator | Dec 2021 |
| 664 | Warren Drilling Co | Dexter City, OH 45727 | Oil & Gas Operator | Dec 2024 |
| 665 | Warren Producers Inc | Bowling Green, KY 42102 | Oil & Gas Operator | Dec 2017 |
| 666 | Washington Natural Gas | | Gas Operator | Dec 2006 |
| 667 | Wayne Gas Company | | Gas Operator | Dec 2015 |
| 668 | Welch Oil & Gas Company | Parkersburg, WV 26104 | Oil & Gas Operator | Jun 2013 |
| 669 | West Side Exploration, LLC | | Oil & Gas Operator | Oct 2025 |
| 670 | West VIrginia Land Resources, Inc. | | Oil & Gas Operator | Dec 2021 |
| 671 | Westmoreland Gas, LLC | | Oil & Gas Operator | Dec 2021 |
| 672 | Weva Oil Corp. | | Oil & Gas Operator | Nov 2019 |
| 673 | Weyerhaeuser Company | Crossett, AR 71635 | Oil & Gas Operator | Sep 1994 |
| 674 | White Gas Company | Barboursville, WV 25504-0000 | Gas Operator | Dec 2017 |
| 675 | Whitnam Oil & Gas Corp. | Glenville, WV 26351 | Oil & Gas Operator | Dec 2009 |
| 676 | Williams Well Surveys Inc. | | Oil & Gas Operator | Dec 1996 |
| 677 | Willow Run Corporation | | Oil & Gas Operator | Dec 2021 |
| 678 | Wilson, Brian K | Fairmont, WV 26554-0148 | Oil & Gas Operator | Dec 2018 |
| 679 | Wilson, H C | | Gas Operator | Dec 2003 |
| 680 | Witco Corporation | Newark, OH 43055 | Oil & Gas Operator | Dec 1995 |
| 681 | Wolf Run Mining LLC | | Oil & Gas Operator | Dec 2021 |
| 682 | WV BD. Directors-State College System | Charleston, WV 25301-0000 | Gas Operator | Dec 2017 |
| 683 | WV Wells, LTD | | Oil & Gas Operator | Nov 2021 |
| 684 | Xplor Corporation | | Oil & Gas Operator | Dec 2013 |
| 685 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 686 | Yale Oil Association | Oklahoma City, OK 73105 | Gas Operator | Oct 2013 |
| 687 | Yost & Yost, Inc. | | Oil & Gas Operator | Dec 2020 |
| 688 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021 | Oil & Gas Operator | Dec 2021 |