| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 301 | Williams, Robert J. | Independence, KS 67301 | Oil Operator | May 2019 |
| 302 | Willis Energy | Neodesha, KS 66757 | Oil & Gas Operator | Dec 2009 |
| 303 | Windgate Oil Com | Oil Operator | Jul 1985 | |
| 304 | Wood, Donald E. | Independence, KS 67301 | Oil & Gas Operator | Dec 2023 |
| 305 | Yager Company | Hutchinson, KS 67502 | Oil & Gas Operator | Dec 2000 |
| 306 | Yocham Oil Company | Oil Operator | Dec 2023 | |
| 307 | Yukon Properties LLC | Villa Park, CA 92861 | Oil & Gas Operator | Sep 2017 |
| 308 | Zeiders Bros Oil & Gas Co LLC | Edmond, OK 73003 | Oil & Gas Operator | Jan 2024 |
| 309 | Zoandra Petroleu | Oil & Gas Operator | May 1993 |