| 1 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 2 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 3 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 4 | Walking X Oil Co. | Whiteface, TX 79379 | Oil & Gas Operator | Oct 2025 |
| 5 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 6 | Wandoo Energy, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Oct 2025 |
| 7 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 8 | Welder Exploration & Prod., Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2022 |
| 9 | Welhausen Operating Co., Inc. | Beeville, TX 78104 | Oil & Gas Operator | Aug 2003 |
| 10 | Welhausen Operating Company, LP | Beeville, TX 78104 | Oil & Gas Operator | Nov 2016 |
| 11 | Wen-Be | Jourdanton, TX 78026 | Oil & Gas Operator | Oct 2025 |
| 12 | Western Pride Resources, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2011 |
| 13 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 14 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 |
| 15 | Whitesands Operating, L.L.C. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Mar 2025 |
| 16 | Whitesands Resources, L.L.C. | Corpus Chrsti, TX 78466 | Oil Operator | Jun 2019 |
| 17 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 18 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 19 | Wiley Lease Co., LTD. | Jourdanton, TX 78026 | Oil Operator | Oct 2025 |
| 20 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 21 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 22 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 23 | Wind River Resources Inc | Tulsa, OK 74136-6381 | Oil & Gas Operator | Jun 2010 |
| 24 | Wing Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2000 |
| 25 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 26 | Wood, C.W. | Calliham, TX 78007 | Oil & Gas Operator | Sep 2023 |
| 27 | WR Resources, LLC | Jourdanton, TX 78026 | Oil & Gas Operator | Oct 2025 |
| 28 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |