| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 501 | Wiesner, Roman L. | Ellis, KS 67637 | Oil Operator | Dec 1993 |
| 502 | Wineland Oil - LLC | Hays, KS 67601 | Oil Operator | Dec 2023 |
| 503 | WM KS Energy Resources LLC | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2019 |
| 504 | Woodman & Iannit | Oil & Gas Operator | Sep 1996 | |
| 505 | Yost Oil Operati | Oil Operator | Jul 1990 | |
| 506 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2023 |
| 507 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 508 | Zinszer Oil Comp | Oil Operator | Aug 1985 | |
| 509 | Zu, LLC | Hays, KS 67601 | Oil Operator | Dec 2023 |