| 32901 | Zimmerman, IVan L. & Lois N. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 32902 | Zimmerman, Wayne W. And Pauline R. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 32903 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 32904 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 32905 | Zink Petroleum Corp | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1993 |
| 32906 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 32907 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 32908 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 32909 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 32910 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 32911 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 32912 | Zion Energy Corporation | Peru, KS 67360 | Oil Operator | Aug 2000 |
| 32913 | Zittel, Kenneth D. | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 32914 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | May 2025 |
| 32915 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | May 2025 |
| 32916 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 32917 | Zlomek, John | Belmont, NY 14813 | Oil & Gas Operator | Dec 2023 |
| 32918 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 32919 | Zoe Oil & Energy, LP | Fort Worth, TX 76148 | Oil & Gas Operator | May 2025 |
| 32920 | Zoller & Danneberg Inc | Denver, CO 80203 | Oil & Gas Operator | May 1975 |
| 32921 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 32922 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |
| 32923 | Zonal Holding Corp. | | Oil Operator | Dec 1998 |
| 32924 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jan 2025 |
| 32925 | Zoran Oil & Gas | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2011 |
| 32926 | Zoran Oil & Gas Co | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2024 |
| 32927 | Zorger, Gerald W. | Wichita, KS 67202 | Oil & Gas Operator | Apr 1985 |
| 32928 | Zorra Oil & Gas | Dilley, TX 78017 | Oil & Gas Operator | May 2025 |
| 32929 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Mar 2025 |
| 32930 | ZSX, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Jul 1997 |
| 32931 | ZTC Petro Investments LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 32932 | ZTH Operating, LLC | Troup, TX 75789 | Oil & Gas Operator | May 2025 |
| 32933 | Zu, LLC | Hays, KS 67601 | Oil Operator | Jan 2025 |
| 32934 | Zuhone William H | Mattoon, IL 61938-4019 | Oil & Gas Operator | Jan 2015 |
| 32935 | Zukowski, Eve | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 32936 | Zumyers Inc | Newalla, OK 74857-0259 | Oil Operator | Apr 2003 |
| 32937 | Zynergy LLC | | Oil Operator | Feb 2025 |
| 32938 | ZZ Energy LLC | Norman, OK 73070 | Gas Operator | Feb 2025 |
| 32939 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |