| 30201 | Universal Exploration Inc | Wadsworth, OH 44281-9460-9460 | Oil & Gas Operator | Feb 2012 |
| 30202 | Universal Fuels Company | | Oil & Gas Operator | Oct 1993 |
| 30203 | Universal Geopower LLC | Houston, TX 77057 | Oil & Gas Operator | May 2016 |
| 30204 | Universal Land | | Oil Operator | Apr 2024 |
| 30205 | Universal Oil Co. | | Oil Operator | Jul 2024 |
| 30206 | Universal Operating, Inc | Evansville, IN 47715 | Oil & Gas Operator | Dec 2022 |
| 30207 | Universal Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2002 |
| 30208 | Universal Producers, Inc. | | Oil Operator | Jun 2001 |
| 30209 | Universal Resour | | Oil & Gas Operator | Dec 1996 |
| 30210 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 30211 | Universal Resources Holdings Inc | Dunkirk, NY 14048 | Oil & Gas Operator | Dec 2023 |
| 30212 | University Field Management LLC | | Oil Operator | May 2024 |
| 30213 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2022 |
| 30214 | Unknown Owner | Columbus, OH 43229 | Oil & Gas Operator | Dec 2008 |
| 30215 | Unocal Explor. Corp. | | Oil & Gas Operator | Nov 1990 |
| 30216 | Unocal Exploration Corporation | | Oil & Gas Operator | May 1992 |
| 30217 | Unoso Operating Company L.L.C. | Georgetown, TX 78633 | Oil & Gas Operator | Nov 2024 |
| 30218 | Unrein Oil Co | | Oil Operator | Jul 2024 |
| 30219 | Unruh, Elmer | Galva, KS 67443 | Oil & Gas Operator | Aug 1998 |
| 30220 | Unruh, Mark D. | Peru, KS 67360 | Oil Operator | Sep 2011 |
| 30221 | Unswept Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Jan 2018 |
| 30222 | Untamed Resources, LLC | Spearman, TX 79081 | Gas Operator | Nov 2024 |
| 30223 | Untener Bishop Kenneth (Diocese Of Saginaw) | | Oil Operator | Dec 2023 |
| 30224 | Uosi Operating, Inc. | Lovelady, TX 75851 | Oil & Gas Operator | Nov 2024 |
| 30225 | Upcurve Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 30226 | Upda Operators, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2009 |
| 30227 | Updike Resources Inc | Newcastle, WY 82701 | Oil & Gas Operator | Jun 1998 |
| 30228 | Upham Oil & Gas Company | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2024 |
| 30229 | Upham, Chester R., Jr. | Mineral Wells, TX 76067 | Oil & Gas Operator | Aug 2001 |
| 30230 | Uphill Consulting LLC | Pearland, TX 77584 | Oil Operator | Nov 2024 |
| 30231 | Upland Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2024 |
| 30232 | Upland Operating, LLC | Dallas, TX 75226 | Oil & Gas Operator | Nov 2024 |
| 30233 | Upland Production Company | Edmond, OK 73083 | Oil & Gas Operator | Nov 2024 |
| 30234 | Upland Resources | | Oil Operator | Jul 1983 |
| 30235 | Upland Resources LLC | Canadian, TX 79014 | Oil & Gas Operator | Nov 2024 |
| 30236 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 30237 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Sep 2024 |
| 30238 | Uplift Production Company, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Feb 1999 |
| 30239 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 30240 | Upstream Exploration LLC | Metairie, LA 70002 | Oil & Gas Operator | Jan 2020 |
| 30241 | Upstream Properties, LLC | Southlake, TX 76092 | Oil & Gas Operator | Nov 2024 |
| 30242 | Upstream Resource Partners, LLC | Palestine, TX 75803 | Oil Operator | Nov 2024 |
| 30243 | Uptex Operating Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2011 |
| 30244 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 30245 | Upton Resources U.S.A. Inc. | | Oil & Gas Operator | Oct 2013 |
| 30246 | Uranus, Inc. | Kansas City, MO 64112 | Oil Operator | Jan 2000 |
| 30247 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Nov 2024 |
| 30248 | Urroz Oil & Gas LLC | Evanston, WY 82931 | Oil & Gas Operator | Jun 2020 |
| 30249 | Ursa Major (Crow Og), LLC | Billings, MT 59101 | Gas Operator | Aug 2017 |
| 30250 | Ursa Operating Company LLC | Denver, CO 80265 | Oil & Gas Operator | Dec 2020 |
| 30251 | Ursus Oil And Gas | Tyler, TX 75703 | Oil & Gas Operator | Nov 2024 |
| 30252 | Us Ecology Winnie, LLC | Winnie, TX 77665 | Oil Operator | Nov 2024 |
| 30253 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 30254 | Us Energy Dev Corp | Getzville, NY 14068-1558 | Oil & Gas Operator | Dec 2021 |
| 30255 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | Jul 2024 |
| 30256 | Us Energy Holdings, LLC | Richardson, TX 75080 | Oil & Gas Operator | Nov 2024 |
| 30257 | Us Energy Oh LLC | Rural Valley, PA 16249 | Oil & Gas Operator | Dec 2023 |
| 30258 | Us Gypsum Co | Oakfield, NY 14125-9722 | Gas Operator | Dec 2005 |
| 30259 | Us Liquids Of La, LTD | | Oil Operator | Jul 2002 |
| 30260 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Oct 2024 |
| 30261 | Us Oil Resources LLC | Lakewood, CO 80123 | Oil Operator | Jul 2024 |
| 30262 | Us Ore Corporation | Pacific Beach, CA 92109 | Oil Operator | Feb 2014 |
| 30263 | Us Petro LP | Amarillo, TX 79106 | Oil & Gas Operator | Apr 2020 |
| 30264 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2024 |
| 30265 | USA Energy LLC | Lance Creek, WY 82222 | Oil & Gas Operator | Jul 2024 |
| 30266 | USA Exploration & Production LLC | Mills, WY 82644 | Oil & Gas Operator | Sep 2012 |
| 30267 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |
| 30268 | USA Tubulars, Inc. | Valley Spring, TX 76885 | Oil & Gas Operator | Dec 1995 |
| 30269 | Uscan Oil Inc | Oil City, PA 16301-1412 | Oil & Gas Operator | Dec 1991 |
| 30270 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 30271 | Usfg Oil & Gas, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2005 |
| 30272 | Usins Oil Compan | | Oil Operator | Jan 1993 |
| 30273 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 30274 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | Sep 2024 |
| 30275 | Utah Oil LLC | Rantoul, KS 66079 | Oil Operator | Jul 2024 |
| 30276 | Utah-Westar DRL Ventures | Dallas, TX 75201 | Oil & Gas Operator | Nov 1987 |
| 30277 | Ute Energy Upstream Holdings LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2012 |
| 30278 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 30279 | Utica Resource Operating LLC | Marietta, OH 45750 | Oil & Gas Operator | Sep 2023 |
| 30280 | Utility Ventures Company | Pasadena, TX 77504 | Oil & Gas Operator | Nov 2024 |
| 30281 | Utoco, LTD. | Midland, TX 79704 | Oil Operator | Nov 2024 |
| 30282 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 30283 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Jul 2024 |
| 30284 | V & H Oil, L.P. | Muenster, TX 76252 | Oil & Gas Operator | Nov 2024 |
| 30285 | V & R Oil | | Oil Operator | Jul 2024 |
| 30286 | V & R Production, Inc | La Plata, NM 87418 | Oil & Gas Operator | Oct 2006 |
| 30287 | V A Resources LLC | Casper, WY 82601 | Oil Operator | Apr 2016 |
| 30288 | V C P Michigan, LLC | | Oil & Gas Operator | Aug 2024 |
| 30289 | V L Pittman PC & Producer, Inc | | Oil & Gas Operator | Jul 1989 |
| 30290 | V S Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Nov 2024 |
| 30291 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 30292 | V-T DRLG Co | | Oil Operator | Dec 2022 |
| 30293 | V. E. Karnes | | Oil Operator | Jun 1989 |
| 30294 | V. Francis Weigel Family Partnership LLC | Gorham, KS 67640 | Oil Operator | Jul 2024 |
| 30295 | V. H. Brumley | | Oil Operator | Jul 1994 |
| 30296 | V. Monta Currie, Jr. | | Oil Operator | Jun 2007 |
| 30297 | V. R. Oil Co. | | Oil Operator | Jul 2024 |
| 30298 | V/J Oil Company | Yancey, TX 78886 | Oil & Gas Operator | Oct 2015 |
| 30299 | Vaalco Energy (USA), Inc. | Houston, TX 77042 | Oil & Gas Operator | Dec 2016 |
| 30300 | Vac Petroleum Co | | Oil Operator | Dec 1990 |