| 1 | W-N Energy Corp | Tulsa, OK 74121-1468 | Oil & Gas Operator | Nov 1994 |
| 2 | Wagon Wheel Oil Company, LLC | El Reno, OK 73036-5935 | Oil Operator | Mar 2025 |
| 3 | Wagon Wheel Production Company | Crawford, OK 73638-9502 | Oil & Gas Operator | Mar 2025 |
| 4 | Walker Gas Company | Romney, WV 25757-0000 | Oil & Gas Operator | Dec 2018 |
| 5 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Jun 2025 |
| 6 | Wapi Operating LLC | McCurtain, OK 74944 | Oil & Gas Operator | Mar 2025 |
| 7 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 8 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2025 |
| 9 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Mar 2025 |
| 10 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Apr 2025 |
| 11 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 12 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Jun 2025 |
| 13 | Williford Resources, L.L.C. | Tulsa, OK 74136-1020 | Oil & Gas Operator | Apr 2025 |
| 14 | Winston Oil Co | Marietta, OH 45750-754-754 | Oil & Gas Operator | Mar 2025 |
| 15 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |