| 1 | Walker, Kent | Midland, TX 79704 | Oil & Gas Operator | Jun 2004 |
| 2 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Oct 2025 |
| 3 | Walton Properties LTD. | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 4 | Warren, Earl T. | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 5 | WCWB Energy, LLC | Midland, TX 79701 | Oil Operator | Sep 2015 |
| 6 | Westar Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 7 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 8 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 9 | WG Oil, LLC | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 10 | WGR, Inc. | Houston, TX 77046 | Gas Operator | Jul 2007 |
| 11 | White'S Industrial Engine'S | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 12 | Whiteman Industries, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | May 2025 |
| 13 | Wilbanks, Bruce A. Company | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 14 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 15 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Oct 2025 |
| 16 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 17 | Wilshire Oil Co. Of Texas | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2004 |
| 18 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 19 | Windsor Permian LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2012 |
| 20 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 21 | Wiseman, B. W., Jr. | Midland, TX 79702 | Oil & Gas Operator | Dec 2002 |
| 22 | WTG Exploration | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |