| 1 | Walcher Oil, LC | Bellevue, WA 98009 | Oil & Gas Operator | May 2026 |
| 2 | Wapiti Petroleum, LLC | | Oil & Gas Operator | May 2026 |
| 3 | Warren Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2016 |
| 4 | Webco Oil Compan | | Oil Operator | Sep 1989 |
| 5 | Webco Oil Company, Inc. | Hoisington, KS 67544 | Oil Operator | May 2026 |
| 6 | Westmore Drillin | | Oil & Gas Operator | Oct 1995 |
| 7 | Wheatbelt Invest | | Oil Operator | Mar 1991 |
| 8 | White & Ellis DR | | Oil & Gas Operator | Aug 1995 |
| 9 | White & Ellis Drilling, Inc. | Wichita, KS 67206 | Oil & Gas Operator | May 2026 |
| 10 | White Eagle Resources Corp. | Taos, NM 87571 | Oil & Gas Operator | Jun 2016 |
| 11 | White Exploration Inc | Wichita, KS 67278 | Oil & Gas Operator | May 2026 |
| 12 | White Hawk Oil C | | Oil & Gas Operator | Sep 1995 |
| 13 | White Hawk Oil Company, A General Partnership | Tulsa, OK 74101 | Oil Operator | May 2026 |
| 14 | White Hawk Oil Company, LLP | Tulsa, OK 74103 | Oil Operator | May 2026 |
| 15 | White Pine Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 16 | White, Kenneth S. | Wichita, KS 67220 | Oil & Gas Operator | Sep 2022 |
| 17 | White, Robert F. | Wichita, KS 67220 | Oil & Gas Operator | Feb 2007 |
| 18 | Whitetail Crude Inc | Ness City, KS 67560 | Oil & Gas Operator | May 2026 |
| 19 | Widener, A.C. Farms, Inc. | Hudson, KS 67545 | Oil Operator | Dec 2009 |
| 20 | Wiedemann K T TR | | Oil Operator | Jul 1992 |
| 21 | Wineland Oil - LLC | Hays, KS 67601 | Oil Operator | May 2026 |
| 22 | Woodman & Iannit | | Oil & Gas Operator | Sep 1996 |
| 23 | Woodman & Iannitti Oil Company | Great Bend, KS 67530 | Oil & Gas Operator | Jan 2003 |
| 24 | Woolsey Operating Company, LLC | Wichita, KS 67226 | Oil & Gas Operator | May 2026 |
| 25 | Woolsey Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 26 | Wren Investments | | Oil Operator | Feb 1991 |