| 32501 | Yucca Petroleum | | Gas Operator | Jan 1994 |
| 32502 | Yukon Exploration Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Nov 2025 |
| 32503 | Yukon Properties LLC | Villa Park, CA 92861 | Oil & Gas Operator | Sep 2017 |
| 32504 | Yuma E & P Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Nov 2025 |
| 32505 | Yuma Oil Company | El Dorado, KS 67042 | Oil Operator | Apr 1993 |
| 32506 | Yuma Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Aug 2002 |
| 32507 | Yunker Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 32508 | Yust, C. F. & R. L. | Batson, TX 77519 | Oil & Gas Operator | Sep 2002 |
| 32509 | Z & L Oil LLC | Longton, KS 67352 | Oil Operator | Jun 2025 |
| 32510 | Z & S Construction Co Inc | Kimball, NE 69145 | Oil & Gas Operator | Jun 2025 |
| 32511 | Z C Ambrose-G L Blaxton, Jr. | | Oil & Gas Operator | Apr 1983 |
| 32512 | Z G Operating LLC | Oklahoma City, OK 73134-5038 | Oil & Gas Operator | Nov 2009 |
| 32513 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 32514 | Z&G Operating | Wichita Falls, TX 76302 | Oil Operator | Sep 2011 |
| 32515 | Z/F Little Buddy, L.P. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2000 |
| 32516 | Zachary Oil Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 32517 | Zachris, Inc. | Mansfield, TX 76063 | Oil Operator | Oct 2021 |
| 32518 | Zachry Exploration, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Nov 2025 |
| 32519 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Nov 2025 |
| 32520 | Zachry Exploration, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Jan 2009 |
| 32521 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Nov 2025 |
| 32522 | Zachry Operating | Midland, TX 79708 | Oil & Gas Operator | Jan 2011 |
| 32523 | Zachry, H. B. Company | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1994 |
| 32524 | Zackson Resources, Inc. | Houston, TX 77063 | Oil & Gas Operator | Nov 2025 |
| 32525 | Zad, Inc. | | Oil Operator | May 2001 |
| 32526 | Zadeck Energy Group | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 32527 | Zadeck Energy Group, Inc. | | Oil & Gas Operator | Dec 2011 |
| 32528 | Zaf Oil | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2002 |
| 32529 | Zafar Oil & Gas, Inc. | Oklahoma City, OK 73132 | Oil Operator | Aug 2013 |
| 32530 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2025 |
| 32531 | Zajac Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Nov 2025 |
| 32532 | Zam'S Production Company | | Oil Operator | Sep 2004 |
| 32533 | Zama Petro Inc | Clinton, WA 98236-0100 | Oil & Gas Operator | Dec 2024 |
| 32534 | Zap Oil Company | Nowata, OK 74048-2640 | Oil & Gas Operator | Nov 2005 |
| 32535 | Zapata-Fender, L. L. C. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2001 |
| 32536 | Zargon Oil (ND) Inc. | | Oil & Gas Operator | Sep 2025 |
| 32537 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2025 |
| 32538 | Zavala Independent Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2007 |
| 32539 | Zavanna Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 32540 | Zavanna, LLC | | Oil & Gas Operator | Aug 2025 |
| 32541 | Zaveri Oil & Gas LTD | Albany, KY 42602 | Oil Operator | Dec 2006 |
| 32542 | Zaza Energy, LLC | Houston, TX 77010 | Oil & Gas Operator | Nov 2025 |
| 32543 | Zca Gas Gathering Co., Inc. | Bartlesville, OK 74003 | Oil & Gas Operator | Apr 2020 |
| 32544 | Zeagler Enterprises, Inc. | | Oil & Gas Operator | Jun 2008 |
| 32545 | Zeal Production Company | Sperry, OK 74073-4714 | Oil & Gas Operator | Aug 2025 |
| 32546 | Zebra Oil And Gas | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2002 |
| 32547 | Zebra Oil Company | El Campo, TX 77437 | Oil & Gas Operator | Nov 2025 |
| 32548 | Zeiders Bros Oil & Gas Co LLC | Edmond, OK 73003 | Oil & Gas Operator | Jul 2025 |
| 32549 | Zeit Exploration Co., Inc. | | Oil & Gas Operator | May 1994 |
| 32550 | Zelaya Oil And Gas, LLC | Premont, TX 78375 | Oil & Gas Operator | Nov 2025 |
| 32551 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 32552 | Zenergy Operating Co. | | Oil & Gas Operator | Sep 2023 |
| 32553 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2016 |
| 32554 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 32555 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 32556 | Zenith Exploration Co Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2014 |
| 32557 | Zenith Oil & Gas Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 32558 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 32559 | Zenithal LLC | Isonville, KY 41149 | Oil & Gas Operator | Dec 2023 |
| 32560 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2025 |
| 32561 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Jul 2025 |
| 32562 | Zephyr SWD LLC | Oklahoma City, OK 73118-6035 | Oil Operator | Aug 2025 |
| 32563 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |
| 32564 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |
| 32565 | Zero Mass Mining, LLC | | Oil Operator | Jan 2025 |
| 32566 | Zeta Energy LLC | Ashland, OR 97520 | Oil Operator | Jun 2025 |
| 32567 | Zetetic Partners, LTD. | Georgetown, TX 78626 | Oil Operator | Dec 2018 |
| 32568 | Zgen, Inc. | | Oil & Gas Operator | Jul 1990 |
| 32569 | Zia Energy Inc | The Woodlands, TX 77380 | Oil & Gas Operator | May 2005 |
| 32570 | Zia Minerals LTD Co | Andrews, TX 79714 | Oil & Gas Operator | Sep 1996 |
| 32571 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021 | Oil & Gas Operator | Dec 2021 |
| 32572 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 32573 | Zielinski, Jason H. | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 32574 | Zilhaver Brian K | Cambridge Springs, PA 16403-4114 | Gas Operator | Dec 2024 |
| 32575 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 32576 | Zilkha Energy Inc | Houston, TX 77002-5223 | Oil & Gas Operator | Dec 2008 |
| 32577 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 32578 | Zimco (Robt A Zimmerman) | Wolf Point, MT 59201 | Oil Operator | Apr 2009 |
| 32579 | Zimmerman Oil & Gas Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 32580 | Zimmerman, Aaron W. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 32581 | Zimmerman, IVan L. & Lois N. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 32582 | Zimmerman, Jon C., II | Freeland, MI 48623 | Gas Operator | Dec 2024 |
| 32583 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 32584 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | Nov 2025 |
| 32585 | Zink Petroleum Corp | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1993 |
| 32586 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 32587 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 32588 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 32589 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 32590 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 32591 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 32592 | Zion Energy Corporation | Peru, KS 67360 | Oil Operator | Aug 2000 |
| 32593 | Zittel, Kenneth D. | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 32594 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Nov 2025 |
| 32595 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | Nov 2025 |
| 32596 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 32597 | Zlomek, John | Belmont, NY 14813 | Oil & Gas Operator | Dec 2024 |
| 32598 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 32599 | Zoe Oil & Energy, LP | Fort Worth, TX 76148 | Oil & Gas Operator | Nov 2025 |
| 32600 | Zoller & Danneberg Inc | Denver, CO 80203 | Oil & Gas Operator | May 1975 |