| 30701 | Unity Petroleum | Howard, OH 43028 | Oil & Gas Operator | Dec 2021 |
| 30702 | Universal Cyclops Specialty Steel Div | Pittsburgh, PA 15228-2702 | Gas Operator | Dec 1985 |
| 30703 | Universal Drilling Company | Denver, CO 80203 | Oil & Gas Operator | Sep 2003 |
| 30704 | Universal Exploration Inc | Wadsworth, OH 44281-9460 | Oil & Gas Operator | Feb 2012 |
| 30705 | Universal Fuels Company | | Oil & Gas Operator | Oct 1993 |
| 30706 | Universal Geopower LLC | Houston, TX 77057 | Oil & Gas Operator | May 2016 |
| 30707 | Universal Land | | Oil Operator | Dec 2024 |
| 30708 | Universal Minerals Inc | Midland, MI 48640 | Oil & Gas Operator | Dec 1984 |
| 30709 | Universal Oil Co. | | Oil Operator | Jan 2025 |
| 30710 | Universal Operating, Inc | Evansville, IN 47715 | Oil & Gas Operator | Dec 2023 |
| 30711 | Universal Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2002 |
| 30712 | Universal Producers, Inc. | | Oil Operator | Jun 2001 |
| 30713 | Universal Resour | | Oil & Gas Operator | Dec 1996 |
| 30714 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 30715 | Universal Resources Holdings Inc | Dunkirk, NY 14048 | Oil & Gas Operator | Dec 2024 |
| 30716 | University Field Management LLC | | Oil Operator | Nov 2024 |
| 30717 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 30718 | Unknown Owner | Columbus, OH 43229 | Oil & Gas Operator | Dec 2008 |
| 30719 | Unocal Explor. Corp. | | Oil & Gas Operator | Nov 1990 |
| 30720 | Unocal Exploration Corporation | Houston, TX 77001 | Oil & Gas Operator | May 1992 |
| 30721 | Unoco, Inc. | Kerrville, TX 78029 | Oil & Gas Operator | Jan 1999 |
| 30722 | Unoso Operating Company L.L.C. | Georgetown, TX 78633 | Oil & Gas Operator | Dec 2025 |
| 30723 | Unregistered Owner | Columbus, OH 43229 | Oil & Gas Operator | Dec 2008 |
| 30724 | Unrein Oil Co | | Oil Operator | Jun 2025 |
| 30725 | Unruh, Elmer | Galva, KS 67443 | Oil & Gas Operator | Aug 1998 |
| 30726 | Unruh, Mark D. | Peru, KS 67360 | Oil Operator | Sep 2011 |
| 30727 | Unswept Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Jan 2018 |
| 30728 | Untamed Resources, LLC | Spearman, TX 79081 | Gas Operator | Dec 2025 |
| 30729 | Untener Bishop Kenneth (Diocese Of Saginaw) | | Oil Operator | Dec 2024 |
| 30730 | Uosi Operating, Inc. | Lovelady, TX 75851 | Oil & Gas Operator | Dec 2025 |
| 30731 | Upco | Mineral Wells, TX 76068 | Gas Operator | Sep 2001 |
| 30732 | Upcurve Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 30733 | Upda Operators, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2009 |
| 30734 | Updike Resources Inc | Newcastle, WY 82701 | Oil & Gas Operator | Jun 1998 |
| 30735 | Upham Oil & Gas Company | Mineral Wells, TX 76068 | Oil & Gas Operator | Dec 2025 |
| 30736 | Upham, Chester R., Jr. | Mineral Wells, TX 76067 | Oil & Gas Operator | Aug 2001 |
| 30737 | Uphill Consulting LLC | Pearland, TX 77584 | Oil & Gas Operator | Dec 2025 |
| 30738 | Upland Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2024 |
| 30739 | Upland Operating, LLC | Dallas, TX 75226 | Oil & Gas Operator | Dec 2025 |
| 30740 | Upland Production Company | Edmond, OK 73083 | Oil & Gas Operator | Dec 2025 |
| 30741 | Upland Resources | | Oil Operator | Jul 1983 |
| 30742 | Upland Resources LLC | Canadian, TX 79014 | Oil & Gas Operator | Dec 2025 |
| 30743 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 30744 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Aug 2025 |
| 30745 | Uplift Production Company, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Feb 1999 |
| 30746 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 30747 | Upstream Exploration LLC | Metairie, LA 70002 | Oil & Gas Operator | Jan 2020 |
| 30748 | Upstream Properties, LLC | Southlake, TX 76092 | Oil & Gas Operator | Dec 2025 |
| 30749 | Upstream Resource Partners, LLC | Elkhart, TX 75839 | Oil Operator | Dec 2025 |
| 30750 | Uptex Operating Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2011 |
| 30751 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 30752 | Upton Resources U.S.A. Inc. | | Oil & Gas Operator | Oct 2013 |
| 30753 | Uranus, Inc. | Kansas City, MO 64112 | Oil Operator | Jan 2000 |
| 30754 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 30755 | Urban, C A & Tersell L W | | Gas Operator | Aug 1937 |
| 30756 | Urroz Oil & Gas LLC | Evanston, WY 82931 | Oil & Gas Operator | Jun 2020 |
| 30757 | Ursa Major (Crow Og), LLC | Billings, MT 59101 | Gas Operator | Aug 2017 |
| 30758 | Ursa Operating Company LLC | Denver, CO 80265 | Oil & Gas Operator | Feb 2014 |
| 30759 | Ursus Oil And Gas | Tyler, TX 75703 | Oil & Gas Operator | Dec 2025 |
| 30760 | Us Ecology Winnie, LLC | Winnie, TX 77665 | Oil Operator | Dec 2025 |
| 30761 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 30762 | Us Energy Dev Corp | Getzville, NY 14068-1558 | Oil & Gas Operator | Dec 2021 |
| 30763 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | May 2025 |
| 30764 | Us Energy Holdings, LLC | Richardson, TX 75080 | Oil & Gas Operator | Dec 2025 |
| 30765 | Us Energy Oh LLC | Rural Valley, PA 16249 | Oil & Gas Operator | Dec 2024 |
| 30766 | Us Gypsum Co | Oakfield, NY 14125-9722 | Gas Operator | Dec 2005 |
| 30767 | Us Liquids Of La, LTD | | Oil Operator | Jul 2002 |
| 30768 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Nov 2025 |
| 30769 | Us Oil Resources LLC | Lakewood, CO 80123 | Oil Operator | Jun 2025 |
| 30770 | Us Ore Corporation | Pacific Beach, CA 92109 | Oil Operator | Feb 2014 |
| 30771 | Us Petro LP | Amarillo, TX 79106 | Oil & Gas Operator | Apr 2020 |
| 30772 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 30773 | USA Energy LLC | Lance Creek, WY 82222 | Oil & Gas Operator | Nov 2024 |
| 30774 | USA Exploration & Production LLC | Mills, WY 82644 | Oil & Gas Operator | Sep 2012 |
| 30775 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |
| 30776 | USA Tubulars, Inc. | Valley Spring, TX 76885 | Oil & Gas Operator | Dec 1995 |
| 30777 | Uscan Oil Inc | Oil City, PA 16301-1412 | Oil & Gas Operator | Dec 1991 |
| 30778 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 30779 | Usfg Oil & Gas, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2005 |
| 30780 | Usins Oil Compan | | Oil Operator | Jan 1993 |
| 30781 | Usoil Corporation | | Oil & Gas Operator | Nov 1998 |
| 30782 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 30783 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | Oct 2025 |
| 30784 | Utah Oil LLC | Rantoul, KS 66079 | Oil Operator | Jun 2025 |
| 30785 | Utah-Westar DRL Ventures | Dallas, TX 75201 | Oil & Gas Operator | Nov 1987 |
| 30786 | Ute Energy Upstream Holdings LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2012 |
| 30787 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 30788 | Utica Resource Operating LLC | Marietta, OH 45750 | Oil & Gas Operator | Sep 2023 |
| 30789 | Utility Ventures Company | Pasadena, TX 77504 | Oil & Gas Operator | Dec 2025 |
| 30790 | Utoco, LTD. | Midland, TX 79704 | Oil Operator | Dec 2025 |
| 30791 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 30792 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | May 2025 |
| 30793 | V & H Oil, L.P. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 30794 | V & R Oil | | Oil Operator | Jun 2025 |
| 30795 | V & R Production, Inc | La Plata, NM 87418 | Oil & Gas Operator | Oct 2006 |
| 30796 | V A B Inc | Weleetka, OK 74880 | Oil & Gas Operator | Jan 2007 |
| 30797 | V A Resources LLC | Casper, WY 82601 | Oil Operator | Apr 2016 |
| 30798 | V C P Michigan, LLC | | Oil & Gas Operator | Oct 2025 |
| 30799 | V L Pittman PC & Producer, Inc | | Oil & Gas Operator | Jul 1989 |
| 30800 | V S Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2025 |