| 30601 | Untamed Resources, LLC | Spearman, TX 79081 | Gas Operator | Jun 2025 |
| 30602 | Untener Bishop Kenneth (Diocese Of Saginaw) | | Oil Operator | Dec 2024 |
| 30603 | Uosi Operating, Inc. | Lovelady, TX 75851 | Oil & Gas Operator | Jun 2025 |
| 30604 | Upco | Mineral Wells, TX 76068 | Gas Operator | Sep 2001 |
| 30605 | Upcurve Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 30606 | Upda Operators, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2009 |
| 30607 | Updike Resources Inc | Newcastle, WY 82701 | Oil & Gas Operator | Jun 1998 |
| 30608 | Upham Oil & Gas Company | Mineral Wells, TX 76068 | Oil & Gas Operator | Jun 2025 |
| 30609 | Upham, Chester R., Jr. | Mineral Wells, TX 76067 | Oil & Gas Operator | Aug 2001 |
| 30610 | Uphill Consulting LLC | Pearland, TX 77584 | Oil & Gas Operator | Jun 2025 |
| 30611 | Upland Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2024 |
| 30612 | Upland Operating, LLC | Dallas, TX 75226 | Oil & Gas Operator | Jun 2025 |
| 30613 | Upland Production Company | Edmond, OK 73083 | Oil & Gas Operator | Jun 2025 |
| 30614 | Upland Resources | | Oil Operator | Jul 1983 |
| 30615 | Upland Resources LLC | Canadian, TX 79014 | Oil & Gas Operator | Jun 2025 |
| 30616 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 30617 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Mar 2025 |
| 30618 | Uplift Production Company, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Feb 1999 |
| 30619 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 30620 | Upstream Exploration LLC | Metairie, LA 70002 | Oil & Gas Operator | Jan 2020 |
| 30621 | Upstream Properties, LLC | Southlake, TX 76092 | Oil & Gas Operator | Jun 2025 |
| 30622 | Upstream Resource Partners, LLC | Palestine, TX 75803 | Oil Operator | Jun 2025 |
| 30623 | Uptex Operating Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2011 |
| 30624 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 30625 | Upton Resources U.S.A. Inc. | | Oil & Gas Operator | Oct 2013 |
| 30626 | Uranus, Inc. | Kansas City, MO 64112 | Oil Operator | Jan 2000 |
| 30627 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jun 2025 |
| 30628 | Urban, C A & Tersell L W | | Gas Operator | Aug 1937 |
| 30629 | Urroz Oil & Gas LLC | Evanston, WY 82931 | Oil & Gas Operator | Jun 2020 |
| 30630 | Ursa Major (Crow Og), LLC | Billings, MT 59101 | Gas Operator | Aug 2017 |
| 30631 | Ursa Operating Company LLC | Denver, CO 80265 | Oil & Gas Operator | Dec 2020 |
| 30632 | Ursus Oil And Gas | Tyler, TX 75703 | Oil & Gas Operator | Jun 2025 |
| 30633 | Us Ecology Winnie, LLC | Winnie, TX 77665 | Oil Operator | Jun 2025 |
| 30634 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 30635 | Us Energy Dev Corp | Getzville, NY 14068-1558 | Oil & Gas Operator | Dec 2021 |
| 30636 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | Feb 2025 |
| 30637 | Us Energy Holdings, LLC | Richardson, TX 75080 | Oil & Gas Operator | Jun 2025 |
| 30638 | Us Energy Oh LLC | Rural Valley, PA 16249 | Oil & Gas Operator | Dec 2024 |
| 30639 | Us Gypsum Co | Oakfield, NY 14125-9722 | Gas Operator | Dec 2005 |
| 30640 | Us Liquids Of La, LTD | | Oil Operator | Jul 2002 |
| 30641 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Apr 2025 |
| 30642 | Us Oil Resources LLC | Lakewood, CO 80123 | Oil Operator | Feb 2025 |
| 30643 | Us Ore Corporation | Pacific Beach, CA 92109 | Oil Operator | Feb 2014 |
| 30644 | Us Petro LP | Amarillo, TX 79106 | Oil & Gas Operator | Apr 2020 |
| 30645 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 30646 | USA Energy LLC | Lance Creek, WY 82222 | Oil & Gas Operator | Nov 2024 |
| 30647 | USA Exploration & Production LLC | Mills, WY 82644 | Oil & Gas Operator | Sep 2012 |
| 30648 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |
| 30649 | USA Tubulars, Inc. | Valley Spring, TX 76885 | Oil & Gas Operator | Dec 1995 |
| 30650 | Uscan Oil Inc | Oil City, PA 16301-1412 | Oil & Gas Operator | Dec 1991 |
| 30651 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 30652 | Usfg Oil & Gas, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2005 |
| 30653 | Usins Oil Compan | | Oil Operator | Jan 1993 |
| 30654 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 30655 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | Mar 2025 |
| 30656 | Utah Oil LLC | Rantoul, KS 66079 | Oil Operator | Feb 2025 |
| 30657 | Utah-Westar DRL Ventures | Dallas, TX 75201 | Oil & Gas Operator | Nov 1987 |
| 30658 | Ute Energy Upstream Holdings LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2012 |
| 30659 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 30660 | Utica Resource Operating LLC | Marietta, OH 45750 | Oil & Gas Operator | Sep 2023 |
| 30661 | Utility Ventures Company | Pasadena, TX 77504 | Oil & Gas Operator | Jun 2025 |
| 30662 | Utoco, LTD. | Midland, TX 79704 | Oil Operator | Jun 2025 |
| 30663 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 30664 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Feb 2025 |
| 30665 | V & H Oil, L.P. | Muenster, TX 76252 | Oil & Gas Operator | Jun 2025 |
| 30666 | V & R Oil | | Oil Operator | Feb 2025 |
| 30667 | V & R Production, Inc | La Plata, NM 87418 | Oil & Gas Operator | Oct 2006 |
| 30668 | V A Resources LLC | Casper, WY 82601 | Oil Operator | Apr 2016 |
| 30669 | V C P Michigan, LLC | | Oil & Gas Operator | Apr 2025 |
| 30670 | V L Pittman PC & Producer, Inc | | Oil & Gas Operator | Jul 1989 |
| 30671 | V S Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Jun 2025 |
| 30672 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 30673 | V. E. Karnes | | Oil Operator | Jun 1989 |
| 30674 | V. Francis Weigel Family Partnership LLC | Gorham, KS 67640 | Oil Operator | Feb 2025 |
| 30675 | V. H. Brumley | | Oil Operator | Jul 1994 |
| 30676 | V. Monta Currie, Jr. | | Oil Operator | Jun 2007 |
| 30677 | V. R. Oil Co. | | Oil Operator | Feb 2025 |
| 30678 | V/J Oil Company | Yancey, TX 78886 | Oil & Gas Operator | Oct 2015 |
| 30679 | Vaalco Energy (USA), Inc. | Houston, TX 77042 | Oil & Gas Operator | Dec 2016 |
| 30680 | Vab Inc | Weleetka, OK 74880 | Oil & Gas Operator | Jan 2007 |
| 30681 | Vac Petroleum Co | | Oil Operator | Dec 1990 |
| 30682 | Vac-U-Lift Production Co.,Inc. | Lake Forest, CA 92630 | Oil & Gas Operator | Jun 2025 |
| 30683 | Vaca Energy LLC | | Oil & Gas Operator | Mar 2025 |
| 30684 | Vaca Operating Company LLC | Pacific PLSDS, CA 90272 | Oil & Gas Operator | Aug 2017 |
| 30685 | Vaco Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2003 |
| 30686 | Vail Energy/Enma | | Oil Operator | Oct 1987 |
| 30687 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Feb 2025 |
| 30688 | Valancy Operating LLC | Goldsby, OK 73093 | Oil & Gas Operator | Apr 2025 |
| 30689 | Valar Petroleum Inc | Houston, TX 77069 | Oil & Gas Operator | May 2006 |
| 30690 | Vale Petroleum Corporation | Houston, TX 77042 | Gas Operator | Jan 1995 |
| 30691 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Jun 2025 |
| 30692 | Valentine Oil & Gas, L.C. | Carmine, TX 78932 | Oil Operator | Nov 2018 |
| 30693 | Valentine Oil Properties | Lowell, OH 45744 | Oil & Gas Operator | Dec 1997 |
| 30694 | Valera Oil Company | Kingsland, TX 78639 | Oil & Gas Operator | Apr 2000 |
| 30695 | Valerius, Inc. & Zine, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 1994 |
| 30696 | Valerius, Robert D. Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Aug 2003 |
| 30697 | Valero Producing Company | | Oil Operator | Sep 1987 |
| 30698 | Valiant Oil & Inv Co | | Oil & Gas Operator | Mar 2025 |
| 30699 | Valid Energy Company | | Oil & Gas Operator | Mar 2025 |
| 30700 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |