| 601 | Tuscany Gas Limited Liability Company | | Gas Operator | Dec 2021 |
| 602 | Ultra Production Company, LLC | Cedar Bluff, VA 24609 | Gas Operator | Oct 2014 |
| 603 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 604 | Underwood, Donald D. Dba Mustang Oil Co | Salem, WV 26426 | Oil & Gas Operator | Dec 2020 |
| 605 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 606 | United Operating Company | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 607 | United Petro LTD. | | Oil & Gas Operator | Dec 2018 |
| 608 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 609 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 610 | Vescal Corporation | Elizabeth, WV 26143-0000 | Oil & Gas Operator | Dec 2017 |
| 611 | Viking Energy Corporation | Odessa, TX 79760 | Oil & Gas Operator | Dec 2021 |
| 612 | Viking International Resources Co., Inc. | | Oil & Gas Operator | Dec 2020 |
| 613 | Virtex Eastern Producing Co., LLC | | Gas Operator | Dec 2021 |
| 614 | W. E. B. Well Tending Service, Inc. | Vienna, WV 26105 | Oil & Gas Operator | Nov 2011 |
| 615 | Waco Oil & Gas Co., Inc. | Glenville, WV 26351-0397 | Oil & Gas Operator | Dec 2021 |
| 616 | Walker Gas Company | Romney, WV 25757-0000 | Oil & Gas Operator | Dec 2018 |
| 617 | Walker Oil And Gas Inc | | Oil & Gas Operator | Jun 2021 |
| 618 | Walker Well Service Inc | Munday, WV 26152 | Oil & Gas Operator | Dec 2021 |
| 619 | Warfield Management, LLC | Newman, GA 30263 | Gas Operator | Dec 2021 |
| 620 | Warren Drilling Co | Dexter City, OH 45727 | Oil & Gas Operator | Dec 2025 |
| 621 | Warren Producers Inc | Bowling Green, KY 42102 | Oil & Gas Operator | Dec 2017 |
| 622 | Wayne Gas Company | | Gas Operator | Dec 2015 |
| 623 | Welch Oil & Gas Company | Parkersburg, WV 26104 | Oil & Gas Operator | Jun 2013 |
| 624 | West Side Exploration, LLC | | Oil & Gas Operator | May 2026 |
| 625 | Westmoreland Gas, LLC | | Oil & Gas Operator | Dec 2021 |
| 626 | Weva Oil Corp. | | Oil & Gas Operator | Nov 2019 |
| 627 | Weyerhaeuser Company | Crossett, AR 71635 | Oil & Gas Operator | Sep 1994 |
| 628 | White Gas Company | Barboursville, WV 25504-0000 | Gas Operator | Dec 2017 |
| 629 | Whitnam Oil & Gas Corp. | Glenville, WV 26351 | Oil & Gas Operator | Dec 2009 |
| 630 | Williams Well Surveys Inc. | | Oil & Gas Operator | Dec 1996 |
| 631 | Willow Run Corporation | | Oil & Gas Operator | Dec 2021 |
| 632 | Wilson, Brian K | Fairmont, WV 26554-0148 | Oil & Gas Operator | Dec 2018 |
| 633 | Witco Corporation | Newark, OH 43055 | Oil & Gas Operator | Dec 1995 |
| 634 | Wolf Run Mining LLC | | Oil & Gas Operator | Dec 2021 |
| 635 | WV Wells, LTD | | Oil & Gas Operator | Nov 2021 |
| 636 | Xplor Corporation | | Oil & Gas Operator | Dec 2013 |
| 637 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2026 |
| 638 | Yale Oil Association | Oklahoma City, OK 73105 | Gas Operator | Oct 2013 |
| 639 | Yost & Yost, Inc. | | Oil & Gas Operator | Dec 2020 |
| 640 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021 | Oil & Gas Operator | Dec 2021 |