| 701 | T & T Compression Inc | Clymer, PA 15728-1014 | Gas Operator | Dec 2025 |
| 702 | Tachoir Resources Inc | | Oil & Gas Operator | Dec 2025 |
| 703 | Tanglewood Expl LLC | Fort Worth, TX 76102-4665 | Gas Operator | Jun 2011 |
| 704 | Target Energy Inc | Indiana, PA 15701-1135 | Oil & Gas Operator | Dec 2013 |
| 705 | Tatonka Oil Co LLC | Columbus, OH 43201-3684 | Oil & Gas Operator | Dec 2025 |
| 706 | Tenaska Res LLC | Canonsburg, PA 15317 | Gas Operator | May 2020 |
| 707 | Ter Ex Inc | Butler, PA 16002-8638 | Gas Operator | Dec 1994 |
| 708 | Terry D Coan | Youngsville, PA 16371-3608 | Oil & Gas Operator | Dec 2021 |
| 709 | Tevebaugh MGMT Co | Baden, PA 15005-0123 | Oil & Gas Operator | Dec 2002 |
| 710 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 711 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 712 | Texakoma Opr LP | Plano, TX 75024-6679 | Oil & Gas Operator | Dec 2012 |
| 713 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 714 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 715 | The Gas & Oil Company LLC | Apollo, PA 15613 | Oil & Gas Operator | Dec 2025 |
| 716 | The Production Co | Ligonier, PA 15658-0467 | Oil & Gas Operator | Dec 2012 |
| 717 | The Production Co LLC | Ligonier, PA 15658-0467 | Oil & Gas Operator | Dec 2020 |
| 718 | Tilden Marcellus LLC | Houston, TX 77024-1358 | Gas Operator | May 2022 |
| 719 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2025 |
| 720 | Timbuck Resources LLC | Fredericktown, OH 43019-0117 | Oil & Gas Operator | Dec 2005 |
| 721 | Timothy Chambers | Punxsutawney, PA 15767-1821 | Gas Operator | Dec 2025 |
| 722 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 723 | Titusville Oil & Gas Assoc Inc | Pleasantville, PA 16341-1705 | Oil Operator | Dec 2025 |
| 724 | TNT Oil Co. | Hamlin, TX 79520 | Oil & Gas Operator | Sep 2026 |
| 725 | Tom A Leeper | Brush Valley, PA 15720-0206 | Oil & Gas Operator | Dec 2024 |
| 726 | Transamer Petro Corp | Pittsburgh, PA 15222-3510 | Gas Operator | Dec 1985 |
| 727 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 728 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 729 | Triana Energy LLC | Charleston, WV 25301-2815 | Gas Operator | Nov 2018 |
| 730 | Trimont Energy LLC | Pittsburgh, PA 15211-1205 | Oil & Gas Operator | Dec 2016 |
| 731 | Trinity Energy Corp | Gibsonia, PA 15044-9106 | Oil & Gas Operator | Dec 2007 |
| 732 | Trinity Mineral Partners LLC | Pittsburgh, PA 15238-2718 | Oil & Gas Operator | Dec 2025 |
| 733 | Troyer Energies Inc | Waterford, PA 16441-2809 | Gas Operator | Dec 2025 |
| 734 | Troyer Gas & Oil | Waterford, PA 16441-2843 | Gas Operator | Dec 2001 |
| 735 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jul 2026 |
| 736 | Tug Hill Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2021 |
| 737 | Turm Oil Inc | | Oil & Gas Operator | Dec 2025 |
| 738 | TW Phillips Gas Supply Corp | Butler, PA 16001-4904 | Oil & Gas Operator | Dec 2011 |
| 739 | Ultra Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Sep 2018 |
| 740 | Union City Boro Muni Auth Erie Cnty | Union City, PA 16438-1326 | Gas Operator | Dec 2024 |
| 741 | United Resources Corp | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 742 | Universal Cyclops Specialty Steel Div | Pittsburgh, PA 15228-2702 | Gas Operator | Dec 1985 |
| 743 | Universal Resources Holdings Inc | Dunkirk, NY 14048 | Oil & Gas Operator | Dec 2025 |
| 744 | Us Energy Dev Corp | Getzville, NY 14068-1558 | Oil & Gas Operator | Dec 2021 |
| 745 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | May 2026 |
| 746 | Us Gypsum Co | Oakfield, NY 14125-9722 | Gas Operator | Dec 2005 |
| 747 | Uscan Oil Inc | Oil City, PA 16301-1412 | Oil & Gas Operator | Dec 1991 |
| 748 | Van Hampton Gas & Oil Co Inc | Pleasantville, PA 16341-0329 | Gas Operator | Dec 2020 |
| 749 | Van Oil Co Inc | Fort Worth, TX 76116 | Oil Operator | Dec 1997 |
| 750 | Vanderhoof Energy Prod LLC | Russell, PA 16345 | Oil & Gas Operator | Dec 2025 |
| 751 | Vantage Energy Appalachia II LLC | Washington, PA 15301-8936 | Gas Operator | Aug 2017 |
| 752 | Vantage Energy Appalachia LLC | Washington, PA 15301-8936 | Gas Operator | Aug 2017 |
| 753 | Vec Energy LLC | Kittanning, PA 16201-5022 | Oil & Gas Operator | Jun 2026 |
| 754 | Venango Energy Partners Inc | Pittsburgh, PA 15211-0134 | Oil Operator | Dec 2025 |
| 755 | Ventura Oil Co | Denver, CO 00000 | Gas Operator | Dec 1985 |
| 756 | Vernard L Shumaker | Apollo, PA 15613-0249 | Gas Operator | Dec 2025 |
| 757 | Vessels Coal Gas Inc | Denver, CO 80202-3539 | Gas Operator | Dec 2025 |
| 758 | Victory Energy Corp | Indiana, PA 15701-8944 | Oil & Gas Operator | Dec 2021 |
| 759 | Viking Resources Corp | Deerfield, OH 44411-0160 | Oil & Gas Operator | Dec 2007 |
| 760 | Viking Resources LLC | Uniontown, OH 44685 | Oil & Gas Operator | Dec 2017 |
| 761 | Vineyard Oil & Gas Co | North East, PA 16428 | Oil & Gas Operator | Dec 2023 |
| 762 | Vista Opr Inc | Pittsburgh, PA 15241-1633 | Oil & Gas Operator | Dec 2024 |
| 763 | Vista Resources Inc | Pittsburgh, PA 15241-1633 | Oil & Gas Operator | Dec 2015 |
| 764 | Wagner & Wagner | Indiana, PA 15701-1273 | Gas Operator | Dec 2012 |
| 765 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 766 | Wallace John J Jr | Cooperstown, PA 16317-1909 | Oil & Gas Operator | Dec 2025 |
| 767 | Wandover Charles T SR | Inverness, FL 34452-7527 | Oil & Gas Operator | Dec 2025 |
| 768 | Warren E & P Inc | Dallas, TX 75240 | Oil & Gas Operator | Jul 2026 |
| 769 | Washington Energy Co LLC | Canonsburg, PA 15317-0400 | Oil & Gas Operator | Dec 2024 |
| 770 | Waste TRMT Corp | Washington, PA 15301-0558 | Oil & Gas Operator | Dec 2024 |
| 771 | WB Prod MGMT Co | | Oil & Gas Operator | Dec 2020 |
| 772 | WBM Enterprises | Creekside, PA 15732-8228 | Oil & Gas Operator | Dec 2025 |
| 773 | Weaver Carroll A | Knox, PA 16232 | Oil Operator | Dec 1992 |
| 774 | Weinsz Oil & Gas Inc | North Canton, OH 44720 | Oil & Gas Operator | Dec 2003 |
| 775 | Weldbank Energy Corp | Warren, PA 16365-5114 | Oil & Gas Operator | Dec 2025 |
| 776 | Werner Oil Farm | | Oil & Gas Operator | Dec 2025 |
| 777 | Wes Oil & Gas LLC | | Gas Operator | Dec 2025 |
| 778 | West Texas Operating Co LLC D/B/A Xtreme Energy Co | | Oil & Gas Operator | May 2026 |
| 779 | Westinghouse Elec Co LLC | | Gas Operator | Dec 2025 |
| 780 | WGM Gas Co Inc | | Oil & Gas Operator | Dec 2025 |
| 781 | WHC Oper LLC | | Gas Operator | Dec 2025 |
| 782 | Whidbey Resources Inc | Streetsboro, OH 44241 | Oil & Gas Operator | Dec 2016 |
| 783 | Whilton Brooks | | Oil & Gas Operator | Dec 2025 |
| 784 | White Oak Farms Inc | | Gas Operator | Dec 2025 |
| 785 | Wilkes Energy Inc | Akron, OH 44308 | Oil & Gas Operator | Dec 2022 |
| 786 | Willard M Cline | | Oil & Gas Operator | Dec 2022 |
| 787 | William L Horner Energy | | Gas Operator | Dec 2014 |
| 788 | William M Mauersberg | Sigel, PA 15860-2402 | Oil & Gas Operator | Dec 2025 |
| 789 | William McIntire Coal Oil & Gas | | Oil & Gas Operator | May 2022 |
| 790 | William Southwell & Son Oil LLC | Warren, PA 16365 | Oil & Gas Operator | Dec 2025 |
| 791 | Wilmoth Clark Exploration & Prod LLC | | Gas Operator | Dec 2008 |
| 792 | Wilmoth Interests, Inc. | Marion Center, PA 15759 | Oil & Gas Operator | May 2026 |
| 793 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | May 2026 |
| 794 | Winfall Energy Inc N V | Apollo, PA 15613-0502 | Oil & Gas Operator | Dec 2025 |
| 795 | Wood Drilling LLC | | Gas Operator | Dec 2025 |
| 796 | Wood William C | | Oil & Gas Operator | Dec 2018 |
| 797 | XPR Resources LLC | | Gas Operator | Jun 2026 |
| 798 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |
| 799 | Yeagle George W | Warren, PA 16365-0924 | Oil Operator | Dec 2010 |
| 800 | Yellowbird Energy LLC | | Gas Operator | Dec 2025 |