| 401 | Universal Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2002 |
| 402 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 403 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 404 | Vaughn Petroleum, Inc. | Dallas, TX 75219 | Oil & Gas Operator | May 2004 |
| 405 | Vector Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2026 |
| 406 | Vernon E. Faulconer, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |
| 407 | Vine Energy Operating LP | | Gas Operator | Oct 2021 |
| 408 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 409 | Vista Corporation | | Oil & Gas Operator | Jan 2011 |
| 410 | Wagon Wheel Arklatex, LLC | | Oil & Gas Operator | May 2018 |
| 411 | Walker Energy, LLC | | Oil & Gas Operator | Nov 2024 |
| 412 | Webster Energy, Inc. | | Oil & Gas Operator | Jan 1999 |
| 413 | Weiser-Brown Operating Company | Magnolia, AR 71754 | Oil & Gas Operator | Feb 2026 |
| 414 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 415 | Wheless Industries, Inc. | Shreveport, LA 71101-5301 | Oil & Gas Operator | Sep 2002 |
| 416 | Wheless Industries-Pelto Oil | | Oil & Gas Operator | Dec 1989 |
| 417 | Wildhorse Resources Management Co, LLC | | Oil & Gas Operator | Feb 2018 |
| 418 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 419 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Feb 2026 |
| 420 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Feb 2026 |
| 421 | Williamson & Smitherman | | Oil & Gas Operator | Dec 2008 |
| 422 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 423 | Williamson Pumping Ser., Inc. | | Oil Operator | Nov 2024 |
| 424 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 425 | Wright Production Company | | Oil Operator | Jun 1990 |
| 426 | WSF, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2013 |
| 427 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 428 | Yates Oil Company | | Oil Operator | Jul 1990 |
| 429 | Youngblood Enterprises, Inc. | | Oil & Gas Operator | Jan 1992 |
| 430 | Zeagler Enterprises, Inc. | | Oil & Gas Operator | Jun 2008 |
| 431 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |