| 6801 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |
| 6802 | Yep Petroleum Group Inc | Muskogee, OK 74403-5952 | Oil Operator | Sep 2024 |
| 6803 | Yerby Bill | Ada, OK 74820-5404 | Oil Operator | Jan 2012 |
| 6804 | Yeubanks Barbara | Cromwell, OK 74837 | Oil Operator | Oct 2024 |
| 6805 | Yingling Oil, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2000 |
| 6806 | Yocham Harlan E. | Sapulpa, OK 74066 | Oil Operator | Aug 2013 |
| 6807 | Young H Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 1993 |
| 6808 | Young Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1999 |
| 6809 | Young Tommy Oil Inc | Woodward, OK 73802-0893 | Oil & Gas Operator | Sep 2024 |
| 6810 | Young Z Joe | Cement, OK 73017-0600 | Oil & Gas Operator | Mar 2015 |
| 6811 | Young Zoral J | Cement, OK 73017 | Oil & Gas Operator | Sep 2000 |
| 6812 | Young, John H., Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2024 |
| 6813 | Young, Marshall R., Oil Co. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 6814 | Youngblood J Lee | Dallas, TX 75221 | Oil & Gas Operator | Feb 1996 |
| 6815 | Younger Enterprises Inc | Ada, OK 74821-1882 | Oil Operator | Jan 2003 |
| 6816 | Z G Operating LLC | Oklahoma City, OK 73134-5038 | Oil & Gas Operator | Nov 2009 |
| 6817 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 6818 | Zafar Oil & Gas, Inc. | Oklahoma City, OK 73132 | Oil Operator | Aug 2013 |
| 6819 | Zap Oil Company | Nowata, OK 74048-2640 | Oil & Gas Operator | Nov 2005 |
| 6820 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 6821 | Zca Gas Gathering Co., Inc. | Bartlesville, OK 74003 | Oil & Gas Operator | Apr 2020 |
| 6822 | Zeal Production Company | Sperry, OK 74073-4714 | Oil & Gas Operator | Sep 2024 |
| 6823 | Zeiders Bros Oil & Gas Co LLC | Edmond, OK 73003 | Oil & Gas Operator | Sep 2024 |
| 6824 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2024 |
| 6825 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2024 |
| 6826 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Sep 2024 |
| 6827 | Zephyr SWD LLC | Oklahoma City, OK 73118-6035 | Oil Operator | Sep 2024 |
| 6828 | Zielke Contracting LLC | Balko, OK 73931-1187 | Oil Operator | Jun 2020 |
| 6829 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 6830 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 6831 | Zimet Brothers Inc | | Oil Operator | Mar 2008 |
| 6832 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 6833 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 6834 | Zion Energy Corporation | Peru, KS 67360 | Oil Operator | Aug 2000 |
| 6835 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 6836 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |
| 6837 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Oct 2024 |
| 6838 | Zuhone William H | Mattoon, IL 61938-4019 | Oil & Gas Operator | Jan 2015 |
| 6839 | Zumyers Inc | Newalla, OK 74857-0259 | Oil Operator | Apr 2003 |
| 6840 | ZZ Energy LLC | Norman, OK 73070 | Gas Operator | Oct 2024 |
| 6841 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |