| 1 | W D L Enterprises, Inc | | Oil & Gas Operator | Apr 1983 |
| 2 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 3 | Wesla Oil & Gas Co., Inc. | | Oil & Gas Operator | Jun 2001 |
| 4 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 5 | White & Ellis Drilling, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 6 | Whitton Company, Inc. | | Oil & Gas Operator | Jul 2020 |
| 7 | Wicker Oil Co | | Oil & Gas Operator | Feb 1992 |
| 8 | Wildcat Midstream Caddo LLC | | Oil Operator | May 2017 |
| 9 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 10 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Oct 2025 |
| 11 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Oct 2025 |
| 12 | William D. Pittman | | Oil & Gas Operator | Jun 1991 |
| 13 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 14 | Winbeau Oil & Gas Co. | | Oil & Gas Operator | Oct 2013 |
| 15 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 16 | WNR Enterprises', Inc. | | Oil & Gas Operator | Feb 1997 |
| 17 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |