| 30401 | Us Energy Oh LLC | Rural Valley, PA 16249 | Oil & Gas Operator | Dec 2024 |
| 30402 | Us Gypsum Co | Oakfield, NY 14125-9722 | Gas Operator | Dec 2005 |
| 30403 | Us Liquids Of La, LTD | | Oil Operator | Jul 2002 |
| 30404 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Sep 2025 |
| 30405 | Us Oil Resources LLC | Lakewood, CO 80123 | Oil Operator | Jun 2025 |
| 30406 | Us Ore Corporation | Pacific Beach, CA 92109 | Oil Operator | Feb 2014 |
| 30407 | Us Petro LP | Amarillo, TX 79106 | Oil & Gas Operator | Apr 2020 |
| 30408 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2025 |
| 30409 | USA Energy LLC | Lance Creek, WY 82222 | Oil & Gas Operator | Nov 2024 |
| 30410 | USA Exploration & Production LLC | Mills, WY 82644 | Oil & Gas Operator | Sep 2012 |
| 30411 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |
| 30412 | USA Tubulars, Inc. | Valley Spring, TX 76885 | Oil & Gas Operator | Dec 1995 |
| 30413 | Uscan Oil Inc | Oil City, PA 16301-1412 | Oil & Gas Operator | Dec 1991 |
| 30414 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 30415 | Usfg Oil & Gas, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2005 |
| 30416 | Usins Oil Compan | | Oil Operator | Jan 1993 |
| 30417 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 30418 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | Aug 2025 |
| 30419 | Utah Oil LLC | Rantoul, KS 66079 | Oil Operator | Jun 2025 |
| 30420 | Utah-Westar DRL Ventures | Dallas, TX 75201 | Oil & Gas Operator | Nov 1987 |
| 30421 | Ute Energy Upstream Holdings LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2012 |
| 30422 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 30423 | Utica Resource Operating LLC | Marietta, OH 45750 | Oil & Gas Operator | Sep 2023 |
| 30424 | Utility Ventures Company | Pasadena, TX 77504 | Oil & Gas Operator | Nov 2025 |
| 30425 | Utoco, LTD. | Midland, TX 79704 | Oil Operator | Nov 2025 |
| 30426 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 30427 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | May 2025 |
| 30428 | V & H Oil, L.P. | Muenster, TX 76252 | Oil & Gas Operator | Nov 2025 |
| 30429 | V & R Oil | | Oil Operator | Jun 2025 |
| 30430 | V & R Production, Inc | La Plata, NM 87418 | Oil & Gas Operator | Oct 2006 |
| 30431 | V A B Inc | Weleetka, OK 74880 | Oil & Gas Operator | Jan 2007 |
| 30432 | V A Resources LLC | Casper, WY 82601 | Oil Operator | Apr 2016 |
| 30433 | V C P Michigan, LLC | | Oil & Gas Operator | Aug 2025 |
| 30434 | V L Pittman PC & Producer, Inc | | Oil & Gas Operator | Jul 1989 |
| 30435 | V S Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Nov 2025 |
| 30436 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 30437 | V. E. Karnes | | Oil Operator | Jun 1989 |
| 30438 | V. Francis Weigel Family Partnership LLC | Gorham, KS 67640 | Oil Operator | Jun 2025 |
| 30439 | V. H. Brumley | | Oil Operator | Jul 1994 |
| 30440 | V. Monta Currie, Jr. | | Oil Operator | Jun 2007 |
| 30441 | V. R. Oil Co. | | Oil Operator | Jun 2025 |
| 30442 | V/J Oil Company | Yancey, TX 78886 | Oil & Gas Operator | Oct 2015 |
| 30443 | Vaalco Energy (USA), Inc. | Houston, TX 77042 | Oil & Gas Operator | Dec 2016 |
| 30444 | Vac Petroleum Co | | Oil Operator | Dec 1990 |
| 30445 | Vac-U-Lift Production Co.,Inc. | Lake Forest, CA 92630 | Oil & Gas Operator | Nov 2025 |
| 30446 | Vaca Energy LLC | | Oil & Gas Operator | Aug 2025 |
| 30447 | Vaca Operating Company LLC | Pacific PLSDS, CA 90272 | Oil & Gas Operator | Aug 2017 |
| 30448 | Vaco Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2003 |
| 30449 | Vail Energy/Enma | | Oil Operator | Oct 1987 |
| 30450 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 30451 | Valancy Operating LLC | Goldsby, OK 73093 | Oil & Gas Operator | Jul 2025 |
| 30452 | Valar Petroleum Inc | Houston, TX 77069 | Oil & Gas Operator | May 2006 |
| 30453 | Vale Petroleum Corporation | Houston, TX 77042 | Gas Operator | Jan 1995 |
| 30454 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Nov 2025 |
| 30455 | Valentine Oil & Gas, L.C. | Carmine, TX 78932 | Oil Operator | Nov 2018 |
| 30456 | Valentine Oil Properties | Lowell, OH 45744 | Oil & Gas Operator | Dec 1997 |
| 30457 | Valera Oil Company | Kingsland, TX 78639 | Oil & Gas Operator | Apr 2000 |
| 30458 | Valerius, Inc. & Zine, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 1994 |
| 30459 | Valerius, Robert D. Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Aug 2003 |
| 30460 | Valero Producing Company | | Oil Operator | Sep 1987 |
| 30461 | Valiant Oil & Inv Co | | Oil & Gas Operator | Jul 2025 |
| 30462 | Valid Energy Company | | Oil & Gas Operator | Aug 2025 |
| 30463 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 30464 | Validus Inc | Fort Lauderdale, FL 33304 | Oil & Gas Operator | Jul 2025 |
| 30465 | Validus NRG Aquilas Assetco LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2022 |
| 30466 | Validus Operating Inc. | Port Aransas, TX 78373 | Oil & Gas Operator | Oct 1998 |
| 30467 | Valjohn Energy Corporation | Dover, OK 73734 | Oil & Gas Operator | Aug 2025 |
| 30468 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 30469 | Valla Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | Aug 2003 |
| 30470 | Vallecito Gas L.L.C. | Farmington, NM 87499 | Oil Operator | May 2012 |
| 30471 | Valley Energy Expl. | | Oil & Gas Operator | Dec 1984 |
| 30472 | Valley Energy Resources Inc. | | Oil & Gas Operator | Dec 2006 |
| 30473 | Valley Gathering Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 30474 | Valley Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 30475 | Valley Operating Inc | Denver, CO 80218-3633 | Oil & Gas Operator | Nov 1995 |
| 30476 | Valley Petrochemicals, LLC | Pharr, TX 78577 | Oil Operator | Nov 2025 |
| 30477 | Valley Petrol Consulting Inc | Denton, TX 76205 | Oil Operator | Jun 2025 |
| 30478 | Valley Petroleum Company | Abilene, TX 79608 | Oil & Gas Operator | Nov 2025 |
| 30479 | Valley Petroleum Management | Utica, OH 43080 | Oil & Gas Operator | Dec 2024 |
| 30480 | Valley Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 30481 | Valor Energy, LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2023 |
| 30482 | Valpoint Operating, LLC | Amarillo, TX 79101 | Oil & Gas Operator | Nov 2025 |
| 30483 | Vamco Operations | | Oil & Gas Operator | Jun 2025 |
| 30484 | Vamos Oil & Gas, LLC | Miami, FL 33129 | Oil & Gas Operator | Nov 2025 |
| 30485 | Van Buskirk Bill | | Oil Operator | Dec 1996 |
| 30486 | Van Buskirk, Billy L. | Severy, KS 67137 | Oil Operator | Dec 2009 |
| 30487 | Van Dall, Don | | Oil Operator | Mar 2015 |
| 30488 | Van Hampton Gas & Oil Co Inc | Pleasantville, PA 16341-0329 | Gas Operator | Dec 2020 |
| 30489 | Van Horn I H | Tulsa, OK 74145-5715 | Oil & Gas Operator | Mar 2001 |
| 30490 | Van Horn Oil & Gas Inc | Tulsa, OK 74170 | Oil & Gas Operator | Nov 1998 |
| 30491 | Van Horn Oil Company | Ada, OK 74820 | Oil & Gas Operator | Oct 1999 |
| 30492 | Van Lingen, Peter | Nashville, TN 37215 | Oil Operator | Dec 2023 |
| 30493 | Van Norman Pipe And Supply | | Oil & Gas Operator | Mar 2010 |
| 30494 | Van Oil Co Inc | Fort Worth, TX 76116 | Oil Operator | Dec 1997 |
| 30495 | Van Oil, Inc. | Madison, KS 66860 | Oil & Gas Operator | Apr 2025 |
| 30496 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | Nov 2025 |
| 30497 | Van Orsdol Paul | Bristow, OK 74010 | Oil & Gas Operator | Mar 2025 |
| 30498 | Van Tol Oil | Sanger, TX 76266 | Oil & Gas Operator | Nov 2025 |
| 30499 | Van Winkle Oil | Floresville, TX 78114 | Oil & Gas Operator | Nov 2025 |
| 30500 | Van Zanten, Inc. | | Gas Operator | Jan 1990 |