| 1 | W. E. B. Well Tending Service, Inc. | Vienna, WV 26105 | Oil & Gas Operator | Nov 2011 |
| 2 | Warren American Oil Co | Tulsa, OK 74147 | Oil & Gas Operator | Jul 2025 |
| 3 | Watco Energy, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Apr 1996 |
| 4 | Waters Eng. & Operating, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Sep 2013 |
| 5 | Watson Energy Investments, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 6 | Wayne E. Glenn Associates, Inc. | Dickinson, TX 77539 | Oil & Gas Operator | Jan 2016 |
| 7 | WCS Oil & Gas Corporation | Dallas, TX 75209 | Oil & Gas Operator | Aug 2021 |
| 8 | Weber Energy Corporation | Dallas, TX 75219 | Oil & Gas Operator | Feb 2017 |
| 9 | Wen-Be | Jourdanton, TX 78026 | Oil & Gas Operator | Oct 2025 |
| 10 | Western Field Exploration, Inc. | Dilley, TX 78017 | Oil & Gas Operator | Oct 2025 |
| 11 | Wetzel Oil Company | Austin, TX 78738 | Oil & Gas Operator | May 2007 |
| 12 | Wgsi Enterprise LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Oct 2025 |
| 13 | White Creek Energy, Inc. | San Antonio, TX 78246 | Oil & Gas Operator | Dec 2003 |
| 14 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 |
| 15 | Wild Cat Operating Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 16 | Wiley Lease Co., LTD. | Jourdanton, TX 78026 | Oil Operator | Oct 2025 |
| 17 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 18 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 19 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 20 | Windsor Exploration Company | Dallas, TX 75204 | Oil & Gas Operator | Jan 1994 |
| 21 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 22 | World Energy Corporation | Laredo, TX 78041 | Oil & Gas Operator | Aug 2003 |
| 23 | WSM | New Braunfels, TX 78132 | Oil Operator | Oct 2025 |
| 24 | WSM LLC | New Braunfels, TX 78132 | Oil Operator | Jun 2025 |
| 25 | WTXR Operating (Texas), Inc. | Carrollton, TX 75007 | Oil Operator | Oct 2025 |