| 30101 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 30102 | Upstream Exploration LLC | Metairie, LA 70002 | Oil & Gas Operator | Jan 2020 |
| 30103 | Upstream Properties, LLC | Southlake, TX 76092 | Oil & Gas Operator | Jul 2026 |
| 30104 | Upstream Resource Partners, LLC | Elkhart, TX 75839 | Oil Operator | Jul 2026 |
| 30105 | Uptex Operating Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2011 |
| 30106 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 30107 | Upton Resources U.S.A., Inc. | | Oil & Gas Operator | Oct 2013 |
| 30108 | Uranus, Inc. | Kansas City, MO 64112 | Oil Operator | Jan 2000 |
| 30109 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jul 2026 |
| 30110 | Urban, C A & Tersell L W | | Gas Operator | Aug 1937 |
| 30111 | Urroz Oil & Gas LLC | Evanston, WY 82931 | Oil & Gas Operator | Jun 2020 |
| 30112 | Ursa Major (Crow Og), LLC | Billings, MT 59101 | Gas Operator | Aug 2017 |
| 30113 | Ursa Operating Company LLC | Denver, CO 80265 | Oil & Gas Operator | Feb 2014 |
| 30114 | Ursus Oil And Gas | Tyler, TX 75703 | Oil & Gas Operator | Jul 2026 |
| 30115 | Us Ecology Winnie, LLC | Winnie, TX 77665 | Oil Operator | Jul 2026 |
| 30116 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 30117 | Us Energy Dev Corp | Getzville, NY 14068-1558 | Oil & Gas Operator | Dec 2021 |
| 30118 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | Mar 2026 |
| 30119 | Us Energy Holdings, LLC | Richardson, TX 75080 | Oil & Gas Operator | Jul 2026 |
| 30120 | Us Energy Oh LLC | Rural Valley, PA 16249 | Oil & Gas Operator | Dec 2025 |
| 30121 | Us Gypsum Co | Oakfield, NY 14125-9722 | Gas Operator | Dec 2005 |
| 30122 | Us Liquids Of La, LTD | | Oil Operator | Jul 2002 |
| 30123 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | May 2026 |
| 30124 | Us Oil Resources LLC | Lakewood, CO 80123 | Oil Operator | Mar 2026 |
| 30125 | Us Ore Corporation | Pacific Beach, CA 92109 | Oil Operator | Feb 2014 |
| 30126 | Us Petro LP | Amarillo, TX 79106 | Oil & Gas Operator | Apr 2020 |
| 30127 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2026 |
| 30128 | USA Energy LLC | Lance Creek, WY 82222 | Oil & Gas Operator | Nov 2024 |
| 30129 | USA Exploration & Production LLC | Mills, WY 82644 | Oil & Gas Operator | Sep 2012 |
| 30130 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |
| 30131 | USA Tubulars, Inc. | Valley Spring, TX 76885 | Oil & Gas Operator | Dec 1995 |
| 30132 | Uscan Oil Inc | Oil City, PA 16301-1412 | Oil & Gas Operator | Dec 1991 |
| 30133 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 30134 | Usfg Oil & Gas, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2005 |
| 30135 | Usins Oil Compan | | Oil Operator | Jan 1993 |
| 30136 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 30137 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | May 2026 |
| 30138 | Utah Oil LLC | Rantoul, KS 66079 | Oil Operator | Mar 2026 |
| 30139 | Utah-Westar DRL Ventures | Dallas, TX 75201 | Oil & Gas Operator | Nov 1987 |
| 30140 | Ute Energy Upstream Holdings LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2012 |
| 30141 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 30142 | Utica Resource Operating LLC | Marietta, OH 45750 | Oil & Gas Operator | Sep 2023 |
| 30143 | Utility Ventures Company | Pasadena, TX 77504 | Oil & Gas Operator | Jul 2026 |
| 30144 | Utoco, LTD. | Midland, TX 79704 | Oil Operator | Jul 2026 |
| 30145 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 30146 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Mar 2026 |
| 30147 | V & H Oil, L.P. | Muenster, TX 76252 | Oil & Gas Operator | Jul 2026 |
| 30148 | V & R Oil | | Oil Operator | Mar 2026 |
| 30149 | V & R Production, Inc | La Plata, NM 87418 | Oil & Gas Operator | Oct 2006 |
| 30150 | V A B Inc | Weleetka, OK 74880 | Oil & Gas Operator | Jan 2007 |
| 30151 | V A Resources LLC | Casper, WY 82601 | Oil Operator | Apr 2016 |
| 30152 | V C P Michigan, LLC | | Oil & Gas Operator | Apr 2026 |
| 30153 | V L Pittman PC & Producer, Inc | | Oil & Gas Operator | Jul 1989 |
| 30154 | V S Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Jul 2026 |
| 30155 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |
| 30156 | V. E. Karnes | | Oil Operator | Jun 1989 |
| 30157 | V. Francis Weigel Family Partnership LLC | Gorham, KS 67640 | Oil Operator | Mar 2026 |
| 30158 | V. H. Brumley | | Oil Operator | Jul 1994 |
| 30159 | V. Monta Currie, Jr. | | Oil Operator | Jun 2007 |
| 30160 | V. R. Oil Co. | | Oil Operator | Mar 2026 |
| 30161 | V/J Oil Company | Yancey, TX 78886 | Oil & Gas Operator | Oct 2015 |
| 30162 | Vaalco Energy (USA), Inc. | Houston, TX 77042 | Oil & Gas Operator | Dec 2016 |
| 30163 | Vac Petroleum Co | | Oil Operator | Dec 1990 |
| 30164 | Vac-U-Lift Production Co.,Inc. | Lake Forest, CA 92630 | Oil & Gas Operator | Jul 2026 |
| 30165 | Vaca Energy LLC | | Oil & Gas Operator | Dec 2025 |
| 30166 | Vaca Operating Company LLC | Pacific PLSDS, CA 90272 | Oil & Gas Operator | Aug 2017 |
| 30167 | Vaco Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2003 |
| 30168 | Vail Energy/Enma | | Oil Operator | Oct 1987 |
| 30169 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Mar 2026 |
| 30170 | Valancy Operating LLC | Goldsby, OK 73093 | Oil & Gas Operator | May 2026 |
| 30171 | Valar Petroleum Inc | Houston, TX 77069 | Oil & Gas Operator | May 2006 |
| 30172 | Vale Petroleum Corporation | Houston, TX 77042 | Gas Operator | Jan 1995 |
| 30173 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2026 |
| 30174 | Valentine Oil & Gas, L.C. | Carmine, TX 78932 | Oil Operator | Nov 2018 |
| 30175 | Valentine Oil Properties | Lowell, OH 45744 | Oil & Gas Operator | Dec 1997 |
| 30176 | Valera Oil Company | Kingsland, TX 78639 | Oil & Gas Operator | Apr 2000 |
| 30177 | Valerius, Inc. & Zine, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 1994 |
| 30178 | Valerius, Robert D. Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Aug 2003 |
| 30179 | Valero Producing Company | | Oil Operator | Sep 1987 |
| 30180 | Valiant Oil & Inv Co | | Oil & Gas Operator | Apr 2026 |
| 30181 | Valid Energy Company | | Oil & Gas Operator | Dec 2025 |
| 30182 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2026 |
| 30183 | Validus Inc | Fort Lauderdale, FL 33304 | Oil & Gas Operator | Feb 2026 |
| 30184 | Validus NRG Aquilas Assetco LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2022 |
| 30185 | Validus Operating Inc. | Port Aransas, TX 78373 | Oil & Gas Operator | Oct 1998 |
| 30186 | Valjohn Energy Corporation | Dover, OK 73734 | Oil & Gas Operator | Apr 2026 |
| 30187 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 30188 | Valla Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | Aug 2003 |
| 30189 | Valle Algodon, LLC | Dallas, TX 75219 | Gas Operator | Jul 2026 |
| 30190 | Vallecito Gas L.L.C. | Farmington, NM 87499 | Oil Operator | May 2012 |
| 30191 | Valley Energy Expl. | | Oil & Gas Operator | Dec 1984 |
| 30192 | Valley Energy Resources Inc. | | Oil & Gas Operator | Dec 2006 |
| 30193 | Valley Gathering Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 30194 | Valley Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 30195 | Valley Operating Inc | Denver, CO 80218-3633 | Oil & Gas Operator | Nov 1995 |
| 30196 | Valley Petrochemicals, LLC | Pharr, TX 78577 | Oil Operator | Jul 2026 |
| 30197 | Valley Petrol Consulting Inc | Denton, TX 76205 | Oil Operator | Apr 2026 |
| 30198 | Valley Petroleum Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2026 |
| 30199 | Valley Petroleum Management | Utica, OH 43080 | Oil & Gas Operator | Dec 2025 |
| 30200 | Valley Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |