| 1 | Z & L Oil LLC | Longton, KS 67352 | Oil Operator | Feb 2026 |
| 2 | Z & S Construction Co Inc | Kimball, NE 69145 | Oil & Gas Operator | Feb 2026 |
| 3 | Z C Ambrose-G L Blaxton, Jr. | | Oil & Gas Operator | Apr 1983 |
| 4 | Z G Operating LLC | Oklahoma City, OK 73134-5038 | Oil & Gas Operator | Nov 2009 |
| 5 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 6 | Z&G Operating | Wichita Falls, TX 76302 | Oil Operator | Sep 2011 |
| 7 | Z/F Little Buddy, L.P. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2000 |
| 8 | Zachary Oil Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 9 | Zachris, Inc. | Mansfield, TX 76063 | Oil Operator | Oct 2021 |
| 10 | Zachry Exploration, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2026 |
| 11 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Jun 2026 |
| 12 | Zachry Exploration, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Jan 2009 |
| 13 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Jun 2026 |
| 14 | Zachry Operating | Midland, TX 79708 | Oil & Gas Operator | Jan 2011 |
| 15 | Zackson Resources, Inc. | Houston, TX 77063 | Oil & Gas Operator | Jun 2026 |
| 16 | Zad, Inc. | | Oil Operator | May 2001 |
| 17 | Zadeck Energy Group | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 18 | Zadeck Energy Group, Inc. | | Oil & Gas Operator | Dec 2011 |
| 19 | Zaf Oil | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2002 |
| 20 | Zafar Oil & Gas, Inc. | Oklahoma City, OK 73132 | Oil Operator | Aug 2013 |
| 21 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2026 |
| 22 | Zajac Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Jun 2026 |
| 23 | Zam'S Production Company | | Oil Operator | Sep 2004 |
| 24 | Zama Petro Inc | Clinton, WA 98236-0100 | Oil & Gas Operator | Dec 2025 |
| 25 | Zap Oil Company | Nowata, OK 74048-2640 | Oil & Gas Operator | Nov 2005 |
| 26 | Zapata-Fender, L. L. C. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2001 |
| 27 | Zargon Oil (ND) Inc. | | Oil & Gas Operator | Apr 2026 |
| 28 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 29 | Zavala Independent Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2007 |
| 30 | Zavanna Energy Operating, LLC | | Oil & Gas Operator | Apr 2026 |
| 31 | Zavanna Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 32 | Zaveri Oil & Gas LTD | Albany, KY 42602 | Oil Operator | Dec 2006 |
| 33 | Zaza Energy, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2026 |
| 34 | Zca Gas Gathering Co., Inc. | Bartlesville, OK 74003 | Oil & Gas Operator | Apr 2020 |
| 35 | Zeagler Enterprises, Inc. | | Oil & Gas Operator | Jun 2008 |
| 36 | Zeal Production Company | Sperry, OK 74073-4714 | Oil & Gas Operator | Mar 2026 |
| 37 | Zebra Oil And Gas | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2002 |
| 38 | Zebra Oil Company | El Campo, TX 77437 | Oil & Gas Operator | Jun 2026 |
| 39 | Zeiders Bros. Oil & Gas Company, L.L.C. | Edmond, OK 73003 | Oil & Gas Operator | Feb 2026 |
| 40 | Zeit Exploration Co., Inc. | | Oil & Gas Operator | May 1994 |
| 41 | Zelaya Oil And Gas, LLC | Premont, TX 78375 | Oil & Gas Operator | Jun 2026 |
| 42 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 43 | Zenergy Operating Co. | | Oil & Gas Operator | Sep 2023 |
| 44 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2016 |
| 45 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 46 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 47 | Zenith Exploration Co Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2014 |
| 48 | Zenith Oil & Gas Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 49 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 50 | Zenithal LLC | Isonville, KY 41149 | Oil & Gas Operator | Dec 2024 |
| 51 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2026 |
| 52 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Mar 2026 |
| 53 | Zephyr SWD LLC | Oklahoma City, OK 73118-6035 | Oil Operator | Mar 2026 |
| 54 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |
| 55 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |
| 56 | Zero Mass Mining, LLC | | Oil Operator | Jan 2025 |
| 57 | Zeta Energy LLC | Ashland, OR 97520 | Oil Operator | Feb 2026 |
| 58 | Zetetic Partners, LTD. | Georgetown, TX 78626 | Oil Operator | Dec 2018 |
| 59 | Zgen, Inc. | | Oil & Gas Operator | Jul 1990 |
| 60 | Zia Energy Inc | The Woodlands, TX 77380 | Oil & Gas Operator | May 2005 |
| 61 | Zia Minerals LTD Co | Andrews, TX 79714 | Oil & Gas Operator | Sep 1996 |
| 62 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021 | Oil & Gas Operator | Dec 2021 |
| 63 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 64 | Zielinski, Jason H. | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 65 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 66 | Zilkha Energy Inc | Houston, TX 77002-5223 | Oil & Gas Operator | Dec 2008 |
| 67 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 68 | Zimco (Robt A Zimmerman) | Wolf Point, MT 59201 | Oil Operator | Apr 2009 |
| 69 | Zimmerman Oil & Gas Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 70 | Zimmerman, Aaron W. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 71 | Zimmerman, IVan L. & Lois N. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 72 | Zimmerman, Jon C., II | Freeland, MI 48623 | Gas Operator | Dec 2024 |
| 73 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 74 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | Jun 2026 |
| 75 | Zink Petroleum Corp | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1993 |
| 76 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 77 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 78 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 79 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 80 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 81 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 82 | Zion Energy Corporation | Peru, KS 67360 | Oil Operator | Aug 2000 |
| 83 | Zittel, Kenneth D. | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 84 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Jun 2026 |
| 85 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | Jun 2026 |
| 86 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 87 | Zlomek, John | Belmont, NY 14813 | Oil & Gas Operator | Dec 2024 |
| 88 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 89 | Zoe Oil & Energy, LP | Watauga, TX 76148 | Oil & Gas Operator | Jun 2026 |
| 90 | Zogreo Energy Inc. | Rockwall, TX 75087 | Oil Operator | Jun 2026 |
| 91 | Zoller & Danneberg Inc | Denver, CO 80203 | Oil & Gas Operator | May 1975 |
| 92 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 93 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |
| 94 | Zonal Holding Corp. | | Oil Operator | Dec 1998 |
| 95 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jan 2025 |
| 96 | Zoran Oil & Gas | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2011 |
| 97 | Zoran Oil & Gas Co | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2025 |
| 98 | Zorger, Gerald W. | Wichita, KS 67202 | Oil & Gas Operator | Apr 1985 |
| 99 | Zorra Oil & Gas | Dilley, TX 78017 | Oil & Gas Operator | Jun 2026 |
| 100 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Mar 2026 |