| 30001 | Upland Operating, LLC | Dallas, TX 75226 | Oil & Gas Operator | Sep 2026 |
| 30002 | Upland Production Company | Edmond, OK 73083 | Oil & Gas Operator | Sep 2026 |
| 30003 | Upland Resources | | Oil Operator | Jul 1983 |
| 30004 | Upland Resources LLC | Canadian, TX 79014 | Oil & Gas Operator | Sep 2026 |
| 30005 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 30006 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jun 2026 |
| 30007 | Uplift Production Company, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Feb 1999 |
| 30008 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 30009 | Upstream Exploration LLC | Metairie, LA 70002 | Oil & Gas Operator | Jan 2020 |
| 30010 | Upstream Properties, LLC | Southlake, TX 76092 | Oil & Gas Operator | Sep 2026 |
| 30011 | Upstream Resource Partners, LLC | Elkhart, TX 75839 | Oil Operator | Sep 2026 |
| 30012 | Uptex Operating Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2011 |
| 30013 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 30014 | Upton Resources U.S.A., Inc. | | Oil & Gas Operator | Oct 2013 |
| 30015 | Uranus, Inc. | Kansas City, MO 64112 | Oil Operator | Jan 2000 |
| 30016 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Sep 2026 |
| 30017 | Urroz Oil & Gas LLC | Evanston, WY 82931 | Oil & Gas Operator | Jun 2020 |
| 30018 | Ursa Major (Crow Og), LLC | Billings, MT 59101 | Gas Operator | Aug 2017 |
| 30019 | Ursa Operating Company LLC | Denver, CO 80265 | Oil & Gas Operator | Feb 2014 |
| 30020 | Ursus Oil And Gas | Tyler, TX 75703 | Oil & Gas Operator | Sep 2026 |
| 30021 | Us Ecology Winnie, LLC | Winnie, TX 77665 | Oil Operator | Sep 2026 |
| 30022 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 30023 | Us Energy Dev Corp | Getzville, NY 14068-1558 | Oil & Gas Operator | Dec 2021 |
| 30024 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | May 2026 |
| 30025 | Us Energy Holdings, LLC | Richardson, TX 75080 | Oil & Gas Operator | Sep 2026 |
| 30026 | Us Energy Oh LLC | Rural Valley, PA 16249 | Oil & Gas Operator | Dec 2025 |
| 30027 | Us Gypsum Co | Oakfield, NY 14125-9722 | Gas Operator | Dec 2005 |
| 30028 | Us Liquids Of La, LTD | | Oil Operator | Jul 2002 |
| 30029 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Jul 2026 |
| 30030 | Us Oil Resources LLC | Lakewood, CO 80123 | Oil Operator | May 2026 |
| 30031 | Us Ore Corporation | Pacific Beach, CA 92109 | Oil Operator | Feb 2014 |
| 30032 | Us Petro LP | Amarillo, TX 79106 | Oil & Gas Operator | Apr 2020 |
| 30033 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2026 |
| 30034 | USA Energy LLC | Lance Creek, WY 82222 | Oil & Gas Operator | Nov 2024 |
| 30035 | USA Exploration & Production LLC | Mills, WY 82644 | Oil & Gas Operator | Sep 2012 |
| 30036 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |
| 30037 | USA Tubulars, Inc. | Valley Spring, TX 76885 | Oil & Gas Operator | Dec 1995 |
| 30038 | Uscan Oil Inc | Oil City, PA 16301-1412 | Oil & Gas Operator | Dec 1991 |
| 30039 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 30040 | Usfg Oil & Gas, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2005 |
| 30041 | Usins Oil Compan | | Oil Operator | Jan 1993 |
| 30042 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 30043 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | Jun 2026 |
| 30044 | Utah Oil LLC | Rantoul, KS 66079 | Oil Operator | May 2026 |
| 30045 | Utah-Westar DRL Ventures | Dallas, TX 75201 | Oil & Gas Operator | Nov 1987 |
| 30046 | Ute Energy Upstream Holdings LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2012 |
| 30047 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 30048 | Utica Resource Operating LLC | Marietta, OH 45750 | Oil & Gas Operator | Sep 2023 |
| 30049 | Utility Ventures Company | Pasadena, TX 77504 | Oil & Gas Operator | Sep 2026 |
| 30050 | Utoco, LTD. | Midland, TX 79704 | Oil Operator | Sep 2026 |
| 30051 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 30052 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | May 2026 |
| 30053 | V & H Oil, L.P. | Muenster, TX 76252 | Oil & Gas Operator | Sep 2026 |
| 30054 | V & R Oil | | Oil Operator | May 2026 |
| 30055 | V & R Production, Inc | La Plata, NM 87418 | Oil & Gas Operator | Oct 2006 |
| 30056 | V A B Inc | Weleetka, OK 74880 | Oil & Gas Operator | Jan 2007 |
| 30057 | V A Resources LLC | Casper, WY 82601 | Oil Operator | Apr 2016 |
| 30058 | V C P Michigan, LLC | | Oil & Gas Operator | Jun 2026 |
| 30059 | V L Pittman PC & Producer, Inc | | Oil & Gas Operator | Jul 1989 |
| 30060 | V S Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Sep 2026 |
| 30061 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 30062 | V. E. Karnes | | Oil Operator | Jun 1989 |
| 30063 | V. Francis Weigel Family Partnership LLC | Gorham, KS 67640 | Oil Operator | May 2026 |
| 30064 | V. H. Brumley | | Oil Operator | Jul 1994 |
| 30065 | V. Monta Currie, Jr. | | Oil Operator | Jun 2007 |
| 30066 | V. R. Oil Co. | | Oil Operator | May 2026 |
| 30067 | V/J Oil Company | Yancey, TX 78886 | Oil & Gas Operator | Oct 2015 |
| 30068 | Vaalco Energy (USA), Inc. | Houston, TX 77042 | Oil & Gas Operator | Dec 2016 |
| 30069 | Vac Petroleum Co | | Oil Operator | Dec 1990 |
| 30070 | Vac-U-Lift Production Co.,Inc. | Lake Forest, CA 92630 | Oil & Gas Operator | Sep 2026 |
| 30071 | Vaca Energy LLC | | Oil & Gas Operator | Dec 2025 |
| 30072 | Vaca Operating Company LLC | Pacific PLSDS, CA 90272 | Oil & Gas Operator | Aug 2017 |
| 30073 | Vaco Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2003 |
| 30074 | Vail Energy/Enma | | Oil Operator | Oct 1987 |
| 30075 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 30076 | Valancy Operating LLC | Goldsby, OK 73093 | Oil & Gas Operator | Jul 2026 |
| 30077 | Valar Petroleum Inc | Houston, TX 77069 | Oil & Gas Operator | May 2006 |
| 30078 | Vale Petroleum Corporation | Houston, TX 77042 | Gas Operator | Jan 1995 |
| 30079 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Sep 2026 |
| 30080 | Valentine Oil & Gas, L.C. | Carmine, TX 78932 | Oil Operator | Nov 2018 |
| 30081 | Valentine Oil Properties | Lowell, OH 45744 | Oil & Gas Operator | Dec 1997 |
| 30082 | Valera Oil Company | Kingsland, TX 78639 | Oil & Gas Operator | Apr 2000 |
| 30083 | Valerius, Inc. & Zine, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 1994 |
| 30084 | Valerius, Robert D. Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Aug 2003 |
| 30085 | Valero Producing Company | | Oil Operator | Sep 1987 |
| 30086 | Valiant Oil & Inv Co | | Oil & Gas Operator | Jun 2026 |
| 30087 | Valid Energy Company | | Oil & Gas Operator | Jul 2026 |
| 30088 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2026 |
| 30089 | Validus Inc | Fort Lauderdale, FL 33304 | Oil & Gas Operator | Jul 2026 |
| 30090 | Validus NRG Aquilas Assetco LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2022 |
| 30091 | Validus Operating Inc. | Port Aransas, TX 78373 | Oil & Gas Operator | Oct 1998 |
| 30092 | Valjohn Energy Corporation | Dover, OK 73734 | Oil & Gas Operator | Jul 2026 |
| 30093 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2026 |
| 30094 | Valla Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | Aug 2003 |
| 30095 | Valle Algodon, LLC | Dallas, TX 75219 | Gas Operator | Sep 2026 |
| 30096 | Vallecito Gas L.L.C. | Farmington, NM 87499 | Oil Operator | May 2012 |
| 30097 | Valley Energy Expl. | | Oil & Gas Operator | Dec 1984 |
| 30098 | Valley Energy Resources Inc. | | Oil & Gas Operator | Dec 2006 |
| 30099 | Valley Gathering Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 30100 | Valley Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |