| 1 | Walker Ervin G | | Oil Operator | Jul 1992 |
| 2 | Walker, Ervin Gilbert | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2020 |
| 3 | Wapiti Petroleum, LLC | | Oil & Gas Operator | Sep 2025 |
| 4 | Watts Oil And Gas | Hardtner, KS 67057 | Oil Operator | Apr 2006 |
| 5 | Wellwin Drilling | | Oil & Gas Operator | Dec 1994 |
| 6 | Wellwin Drilling Corporation | Wellington, KS 67152 | Oil & Gas Operator | Sep 2025 |
| 7 | Westmore Drillin | | Oil & Gas Operator | Oct 1995 |
| 8 | Westmore Drilling Company, Inc. | Lawrence, KS 66047 | Oil & Gas Operator | Dec 2019 |
| 9 | White & Ellis DR | | Oil & Gas Operator | Aug 1995 |
| 10 | White & Ellis Drilling, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 11 | White Exploration Inc | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 12 | White Pine Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 13 | White, Kenneth S. | Wichita, KS 67220 | Oil & Gas Operator | Sep 2022 |
| 14 | White, Robert F. | Wichita, KS 67220 | Oil & Gas Operator | Feb 2007 |
| 15 | Wildcat Oil & Gas LLC | Seneca, KS 66538 | Oil & Gas Operator | Sep 2025 |
| 16 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Sep 2025 |
| 17 | WM KS Energy Resources LLC | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2019 |
| 18 | Woolsey Operating Company, LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 19 | Woolsey Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 20 | Wortman Farms, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2017 |