| 33901 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2025 |
| 33902 | Zenergy Operating Co. | | Oil & Gas Operator | Sep 2023 |
| 33903 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2016 |
| 33904 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 33905 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 33906 | Zenith Exploration Co Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2014 |
| 33907 | Zenith Oil & Gas Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 33908 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 33909 | Zenithal LLC | Isonville, KY 41149 | Oil & Gas Operator | Dec 2023 |
| 33910 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2026 |
| 33911 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Oct 2025 |
| 33912 | Zephyr SWD LLC | Oklahoma City, OK 73118-6035 | Oil Operator | Nov 2025 |
| 33913 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |
| 33914 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |
| 33915 | Zero Mass Mining, LLC | | Oil Operator | Jan 2025 |
| 33916 | Zeta Energy LLC | Ashland, OR 97520 | Oil Operator | Sep 2025 |
| 33917 | Zetetic Partners, LTD. | Georgetown, TX 78626 | Oil Operator | Dec 2018 |
| 33918 | Zgen, Inc. | | Oil & Gas Operator | Jul 1990 |
| 33919 | Zia Energy Inc | The Woodlands, TX 77380 | Oil & Gas Operator | May 2005 |
| 33920 | Zia Minerals LTD Co | Andrews, TX 79714 | Oil & Gas Operator | Sep 1996 |
| 33921 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021 | Oil & Gas Operator | Dec 2021 |
| 33922 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 33923 | Zielinski, Jason H. | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 33924 | Zilhaver Brian K | Cambridge Springs, PA 16403-4114 | Gas Operator | Dec 2024 |
| 33925 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 33926 | Zilkha Energy Inc | Houston, TX 77002-5223 | Oil & Gas Operator | Dec 2008 |
| 33927 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 33928 | Zimco (Robt A Zimmerman) | Wolf Point, MT 59201 | Oil Operator | Apr 2009 |
| 33929 | Zimmerman Oil & Gas Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 33930 | Zimmerman, Aaron W. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 33931 | Zimmerman, IVan L. & Lois N. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 33932 | Zimmerman, Jon C., II | Freeland, MI 48623 | Gas Operator | Dec 2024 |
| 33933 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 33934 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 33935 | Zink Petroleum Corp | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1993 |
| 33936 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 33937 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 33938 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 33939 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 33940 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 33941 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 33942 | Zion Energy Corporation | Peru, KS 67360 | Oil Operator | Aug 2000 |
| 33943 | Zittel, Kenneth D. | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 33944 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Feb 2026 |
| 33945 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | Feb 2026 |
| 33946 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 33947 | Zlomek, John | Belmont, NY 14813 | Oil & Gas Operator | Dec 2024 |
| 33948 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 33949 | Zoe Oil & Energy, LP | Fort Worth, TX 76148 | Oil & Gas Operator | Feb 2026 |
| 33950 | Zoller & Danneberg Inc | Denver, CO 80203 | Oil & Gas Operator | May 1975 |
| 33951 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 33952 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |
| 33953 | Zonal Holding Corp. | | Oil Operator | Dec 1998 |
| 33954 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jan 2025 |
| 33955 | Zoran Oil & Gas | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2011 |
| 33956 | Zoran Oil & Gas Co | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2024 |
| 33957 | Zorger, Gerald W. | Wichita, KS 67202 | Oil & Gas Operator | Apr 1985 |
| 33958 | Zorra Oil & Gas | Dilley, TX 78017 | Oil & Gas Operator | Feb 2026 |
| 33959 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Nov 2025 |
| 33960 | ZSX, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Jul 1997 |
| 33961 | ZTC Petro Investments LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 33962 | ZTH Operating, LLC | Troup, TX 75789 | Oil & Gas Operator | Feb 2026 |
| 33963 | Zu, LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 33964 | Zuhone William H | Mattoon, IL 61938-4019 | Oil & Gas Operator | Jan 2015 |
| 33965 | Zukowski, Eve | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 33966 | Zumyers Inc | Newalla, OK 74857-0259 | Oil Operator | Apr 2003 |
| 33967 | Zynergy LLC | | Oil Operator | Nov 2025 |
| 33968 | ZZ Energy LLC | Norman, OK 73070 | Gas Operator | Oct 2025 |
| 33969 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |