| 33301 | Zetetic Partners, LTD. | Georgetown, TX 78626 | Oil Operator | Dec 2018 |
| 33302 | Zgen, Inc. | | Oil & Gas Operator | Jul 1990 |
| 33303 | Zia Energy Inc | The Woodlands, TX 77380 | Oil & Gas Operator | May 2005 |
| 33304 | Zia Minerals LTD Co | Andrews, TX 79714 | Oil & Gas Operator | Sep 1996 |
| 33305 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021 | Oil & Gas Operator | Dec 2021 |
| 33306 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 33307 | Zielke Contracting LLC | Balko, OK 73931-1187 | Oil Operator | Jun 2020 |
| 33308 | Zilhaver Brian K | Cambridge Springs, PA 16403-4114 | Gas Operator | Dec 2024 |
| 33309 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 33310 | Zilkha Energy Inc | Houston, TX 77002-5223-5223 | Oil & Gas Operator | Dec 2008 |
| 33311 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 33312 | Zimco (Robt A Zimmerman) | Wolf Point, MT 59201 | Oil Operator | Apr 2009 |
| 33313 | Zimet Brothers Inc | | Oil Operator | Mar 2008 |
| 33314 | Zimmerman Oil & Gas Exploration, Inc. | Lovington, NM 88260 | Oil & Gas Operator | Mar 2025 |
| 33315 | Zimmerman, Aaron W. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 33316 | Zimmerman, IVan L. & Lois N. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 33317 | Zimmerman, Wayne W. And Pauline R. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 33318 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 33319 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | Apr 2025 |
| 33320 | Zink Petroleum Corp | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1993 |
| 33321 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 33322 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 33323 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 33324 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 33325 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 33326 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 33327 | Zion Energy Corporation | Peru, KS 67360 | Oil Operator | Aug 2000 |
| 33328 | Zittel, Kenneth D. | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 33329 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Apr 2025 |
| 33330 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | Apr 2025 |
| 33331 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 33332 | Zlomek, John | Belmont, NY 14813 | Oil & Gas Operator | Dec 2023 |
| 33333 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 33334 | Zoe Oil & Energy, LP | Fort Worth, TX 76148 | Oil & Gas Operator | Apr 2025 |
| 33335 | Zoller & Danneberg Inc | Denver, CO 80203 | Oil & Gas Operator | May 1975 |
| 33336 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 33337 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |
| 33338 | Zonal Holding Corp. | | Oil Operator | Dec 1998 |
| 33339 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jan 2025 |
| 33340 | Zoran Oil & Gas | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2011 |
| 33341 | Zoran Oil & Gas Co | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2024 |
| 33342 | Zorger, Gerald W. | Wichita, KS 67202 | Oil & Gas Operator | Apr 1985 |
| 33343 | Zorra Oil & Gas | Dilley, TX 78017 | Oil & Gas Operator | Apr 2025 |
| 33344 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Feb 2025 |
| 33345 | ZSX, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Jul 1997 |
| 33346 | ZTC Petro Investments LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 33347 | ZTH Operating, LLC | Troup, TX 75789 | Oil & Gas Operator | Apr 2025 |
| 33348 | Zu, LLC | Hays, KS 67601 | Oil Operator | Dec 2024 |
| 33349 | Zuhone William H | Mattoon, IL 61938-4019 | Oil & Gas Operator | Jan 2015 |
| 33350 | Zukowski, Eve | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 33351 | Zumyers Inc | Newalla, OK 74857-0259 | Oil Operator | Apr 2003 |
| 33352 | Zynergy LLC | | Oil Operator | Dec 2024 |
| 33353 | ZZ Energy LLC | Norman, OK 73070 | Gas Operator | Jan 2025 |
| 33354 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |