| 4801 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 4802 | Yager Company | Hutchinson, KS 67502 | Oil & Gas Operator | Dec 2000 |
| 4803 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 4804 | Yarnell Ditching | Erie, KS 66733 | Gas Operator | Mar 2000 |
| 4805 | Yearout, Dwain L. | South Haven, KS 67140 | Oil Operator | Oct 2024 |
| 4806 | Yellow Rose Energy, Inc. | Cottonwood Falls, KS 66845 | Gas Operator | Oct 1999 |
| 4807 | Yocham Oil Company | | Oil Operator | Dec 2024 |
| 4808 | Yoder Oil Compan | | Oil Operator | Sep 1988 |
| 4809 | Yoder, Alvin G. | Welda, KS 66091 | Oil Operator | Dec 2024 |
| 4810 | Yost Oil Operati | | Oil Operator | Jul 1990 |
| 4811 | Yost Oil Operations, Inc. | Russell, KS 67665 | Oil Operator | May 1999 |
| 4812 | Yost, M. A. | Russell, KS 67665 | Oil Operator | Aug 1990 |
| 4813 | Young Petroleum Service, LLC | Wichita, KS 67212 | Oil & Gas Operator | Sep 2023 |
| 4814 | Young, Harvey L. | Erie, KS 66733 | Oil Operator | Feb 2008 |
| 4815 | Younger Bernard | | Oil Operator | Nov 1992 |
| 4816 | Younger Energy C | | Oil & Gas Operator | Dec 1996 |
| 4817 | Younger Energy Company | Wichita, KS 67206 | Oil & Gas Operator | Apr 2025 |
| 4818 | Yucca Petroleum | | Gas Operator | Jan 1994 |
| 4819 | Yukon Properties LLC | Villa Park, CA 92861 | Oil & Gas Operator | Sep 2017 |
| 4820 | Yuma Oil Company | El Dorado, KS 67042 | Oil Operator | Apr 1993 |
| 4821 | Z & L Oil LLC | Longton, KS 67352 | Oil Operator | Dec 2024 |
| 4822 | Zeiders Bros Oil & Gas Co LLC | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |
| 4823 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2025 |
| 4824 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 4825 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2024 |
| 4826 | Zeta Energy LLC | Ashland, OR 97520 | Oil Operator | Dec 2024 |
| 4827 | Zetetic Partners, LTD. | Georgetown, TX 78626 | Oil Operator | Dec 2018 |
| 4828 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 4829 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 4830 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 4831 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 4832 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 4833 | Zorger, Gerald W. | Wichita, KS 67202 | Oil & Gas Operator | Apr 1985 |
| 4834 | Zu, LLC | Hays, KS 67601 | Oil Operator | Dec 2024 |