| 1 | W.O.G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2 | Walbet | Monahans, TX 79756 | Oil & Gas Operator | Dec 1993 |
| 3 | Walbet, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 4 | Walsh Resources, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Oct 2025 |
| 5 | Watco Energy, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Apr 1996 |
| 6 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 7 | West Bay Exploration Company | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 8 | Western Pride Resources, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2011 |
| 9 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 10 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 11 | Wetwick DRLG. & Prod. | Carlsbad, TX 76934 | Oil Operator | Oct 2025 |
| 12 | WG Oil, LLC | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 13 | Whitehawk Production Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 14 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 15 | Wilbanks, Bruce A. Company | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 16 | Wilshire Oil Co. Of Texas | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2004 |
| 17 | Wilson, WM. B. Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 18 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |