| 32401 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 32402 | Z&G Operating | Wichita Falls, TX 76302 | Oil Operator | Sep 2011 |
| 32403 | Z/F Little Buddy, L.P. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2000 |
| 32404 | Zachary Oil Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 32405 | Zachris, Inc. | Mansfield, TX 76063 | Oil Operator | Oct 2021 |
| 32406 | Zachry Exploration, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Oct 2024 |
| 32407 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Oct 2024 |
| 32408 | Zachry Exploration, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Jan 2009 |
| 32409 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Oct 2024 |
| 32410 | Zachry Operating | Midland, TX 79708 | Oil & Gas Operator | Jan 2011 |
| 32411 | Zackson Resources, Inc. | Houston, TX 77063 | Oil & Gas Operator | Oct 2024 |
| 32412 | Zad, Inc. | | Oil Operator | Jun 2001 |
| 32413 | Zadeck Energy Group | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 32414 | Zadeck Energy Group Inc | | Oil & Gas Operator | Jun 2013 |
| 32415 | Zaf Oil | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2002 |
| 32416 | Zafar Oil & Gas, Inc. | Oklahoma City, OK 73132 | Oil Operator | Aug 2013 |
| 32417 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2024 |
| 32418 | Zajac Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Oct 2024 |
| 32419 | Zam'S Production Company | | Oil Operator | Sep 2004 |
| 32420 | Zama Petro Inc | Clinton, WA 98236-0100 | Oil & Gas Operator | Dec 2023 |
| 32421 | Zap Oil Company | Nowata, OK 74048-2640 | Oil & Gas Operator | Nov 2005 |
| 32422 | Zapata-Fender, L. L. C. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2001 |
| 32423 | Zargon Oil (ND) Inc. | | Oil & Gas Operator | Aug 2024 |
| 32424 | Zarko Exploration, LLC | | Gas Operator | Jun 2018 |
| 32425 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2024 |
| 32426 | Zavala Independent Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2007 |
| 32427 | Zavanna Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2024 |
| 32428 | Zavanna, LLC | | Oil & Gas Operator | Aug 2024 |
| 32429 | Zaveri Oil & Gas LTD | Albany, KY 42602 | Oil Operator | Dec 2006 |
| 32430 | Zaza Energy, LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2024 |
| 32431 | Zca Gas Gathering Co., Inc. | Bartlesville, OK 74003 | Oil & Gas Operator | Apr 2020 |
| 32432 | Zeagler Enterprises, Inc. | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2009 |
| 32433 | Zeal Production Company | Sperry, OK 74073-4714 | Oil & Gas Operator | Jul 2024 |
| 32434 | Zebra Oil And Gas | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2002 |
| 32435 | Zebra Oil Company | El Campo, TX 77437 | Oil & Gas Operator | Oct 2024 |
| 32436 | Zeiders Bros Oil & Gas Co LLC | Edmond, OK 73003 | Oil & Gas Operator | Jun 2024 |
| 32437 | Zeit Exploration Co., Inc. | | Oil & Gas Operator | May 1994 |
| 32438 | Zelaya Oil And Gas, LLC | Premont, TX 78375 | Oil & Gas Operator | Oct 2024 |
| 32439 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2024 |
| 32440 | Zenergy Operating Co. | | Oil & Gas Operator | Sep 2023 |
| 32441 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2016 |
| 32442 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 32443 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jun 2024 |
| 32444 | Zenith Exploration Co Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2014 |
| 32445 | Zenith Oil & Gas Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 32446 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2024 |
| 32447 | Zenithal LLC | Isonville, KY 41149 | Oil & Gas Operator | Dec 2022 |
| 32448 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 2024 |
| 32449 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Jun 2024 |
| 32450 | Zephyr SWD LLC | Oklahoma City, OK 73118-6035 | Oil Operator | Jun 2024 |
| 32451 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |
| 32452 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |
| 32453 | Zeta Energy LLC | Ashland, OR 97520 | Oil Operator | Jun 2024 |
| 32454 | Zetetic Partners, LTD. | Georgetown, TX 78626 | Oil Operator | Dec 2018 |
| 32455 | Zgen, Inc. | | Oil & Gas Operator | Jul 1990 |
| 32456 | Zia Energy Inc | The Woodlands, TX 77380 | Oil & Gas Operator | May 2005 |
| 32457 | Zia Minerals LTD Co | Andrews, TX 79714 | Oil & Gas Operator | Sep 1996 |
| 32458 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021-0000 | Oil & Gas Operator | Dec 2021 |
| 32459 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 32460 | Zielke Contracting LLC | Balko, OK 73931-1187 | Oil Operator | Jun 2020 |
| 32461 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 32462 | Zilkha Energy Inc | Houston, TX 77002-5223-5223 | Oil & Gas Operator | Dec 2008 |
| 32463 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 32464 | Zimco (Robt A Zimmerman) | Wolf Point, MT 59201 | Oil Operator | Apr 2009 |
| 32465 | Zimet Brothers Inc | | Oil Operator | Mar 2008 |
| 32466 | Zimmerman Oil & Gas Exploration, Inc. | Lovington, NM 88260 | Oil & Gas Operator | Dec 2020 |
| 32467 | Zimmerman, Aaron W. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 32468 | Zimmerman, IVan L. & Lois N. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 32469 | Zimmerman, Wayne W. And Pauline R. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 32470 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 32471 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | Oct 2024 |
| 32472 | Zink Petroleum Corp | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1993 |
| 32473 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 32474 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 32475 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 32476 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 32477 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 32478 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 32479 | Zion Energy Corporation | Peru, KS 67360 | Oil Operator | Aug 2000 |
| 32480 | Zittel, Kenneth D. | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 32481 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Oct 2024 |
| 32482 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | Oct 2024 |
| 32483 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 32484 | Zlomek, John | Belmont, NY 14813 | Oil & Gas Operator | Dec 2023 |
| 32485 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 32486 | Zoe Oil & Energy, LP | Fort Worth, TX 76148 | Oil & Gas Operator | Oct 2024 |
| 32487 | Zoller & Danneberg Inc | Denver, CO 80203 | Oil & Gas Operator | May 1975 |
| 32488 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 32489 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |
| 32490 | Zonal Holding Corp. | | Oil Operator | Dec 1998 |
| 32491 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jul 2024 |
| 32492 | Zoran Oil & Gas | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2011 |
| 32493 | Zoran Oil & Gas Co | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2023 |
| 32494 | Zorger, Gerald W. | Wichita, KS 67202 | Oil & Gas Operator | Apr 1985 |
| 32495 | Zorra Oil & Gas | Dilley, TX 78017 | Oil & Gas Operator | Oct 2024 |
| 32496 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Jul 2024 |
| 32497 | ZSX, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Jul 1997 |
| 32498 | ZTC Petro Investments LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 32499 | ZTH Operating, LLC | Arp, TX 75750 | Oil & Gas Operator | Oct 2024 |
| 32500 | Zu, LLC | Hays, KS 67601 | Oil Operator | Jun 2024 |