| 33101 | Yunker Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 33102 | Yust, C. F. & R. L. | Batson, TX 77519 | Oil & Gas Operator | Sep 2002 |
| 33103 | Z & L Oil LLC | Longton, KS 67352 | Oil Operator | Jun 2025 |
| 33104 | Z & S Construction Co Inc | Kimball, NE 69145 | Oil & Gas Operator | Oct 2025 |
| 33105 | Z C Ambrose-G L Blaxton, Jr. | | Oil & Gas Operator | Apr 1983 |
| 33106 | Z G Operating LLC | Oklahoma City, OK 73134-5038 | Oil & Gas Operator | Nov 2009 |
| 33107 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 33108 | Z&G Operating | Wichita Falls, TX 76302 | Oil Operator | Sep 2011 |
| 33109 | Z/F Little Buddy, L.P. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2000 |
| 33110 | Zachary Oil Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 33111 | Zachris, Inc. | Mansfield, TX 76063 | Oil Operator | Oct 2021 |
| 33112 | Zachry Exploration, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2025 |
| 33113 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Dec 2025 |
| 33114 | Zachry Exploration, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Jan 2009 |
| 33115 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Dec 2025 |
| 33116 | Zachry Operating | Midland, TX 79708 | Oil & Gas Operator | Jan 2011 |
| 33117 | Zachry, H. B. Company | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1994 |
| 33118 | Zackson Resources, Inc. | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 33119 | Zad, Inc. | | Oil Operator | May 2001 |
| 33120 | Zadeck Energy Group | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 33121 | Zadeck Energy Group, Inc. | | Oil & Gas Operator | Dec 2011 |
| 33122 | Zaf Oil | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2002 |
| 33123 | Zafar Oil & Gas, Inc. | Oklahoma City, OK 73132 | Oil Operator | Aug 2013 |
| 33124 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 33125 | Zajac Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Dec 2025 |
| 33126 | Zam'S Production Company | | Oil Operator | Sep 2004 |
| 33127 | Zama Petro Inc | Clinton, WA 98236-0100 | Oil & Gas Operator | Dec 2024 |
| 33128 | Zander H Corpora | | Oil & Gas Operator | Oct 1985 |
| 33129 | Zap Oil Company | Nowata, OK 74048-2640 | Oil & Gas Operator | Nov 2005 |
| 33130 | Zapata-Fender, L. L. C. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2001 |
| 33131 | Zargon Oil (ND) Inc. | | Oil & Gas Operator | Nov 2025 |
| 33132 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 33133 | Zavala Independent Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2007 |
| 33134 | Zavanna Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 33135 | Zavanna, LLC | | Oil & Gas Operator | Nov 2025 |
| 33136 | Zaveri Oil & Gas LTD | Albany, KY 42602 | Oil Operator | Dec 2006 |
| 33137 | Zaza Energy, LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 33138 | Zca Gas Gathering Co., Inc. | Bartlesville, OK 74003 | Oil & Gas Operator | Apr 2020 |
| 33139 | Zeagler Enterprises, Inc. | | Oil & Gas Operator | Jun 2008 |
| 33140 | Zeal Production Company | Sperry, OK 74073-4714 | Oil & Gas Operator | Oct 2025 |
| 33141 | Zebra Oil And Gas | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2002 |
| 33142 | Zebra Oil Company | El Campo, TX 77437 | Oil & Gas Operator | Dec 2025 |
| 33143 | Zeiders Bros. Oil & Gas Company, L.L.C. | Edmond, OK 73003 | Oil & Gas Operator | Sep 2025 |
| 33144 | Zeit Exploration Co., Inc. | | Oil & Gas Operator | May 1994 |
| 33145 | Zelaya Oil And Gas, LLC | Premont, TX 78375 | Oil & Gas Operator | Dec 2025 |
| 33146 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 33147 | Zenergy Operating Co. | | Oil & Gas Operator | Sep 2023 |
| 33148 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2016 |
| 33149 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 33150 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 33151 | Zenith Exploration Co Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2014 |
| 33152 | Zenith Oil & Gas Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 33153 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 33154 | Zenithal LLC | Isonville, KY 41149 | Oil & Gas Operator | Dec 2023 |
| 33155 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 33156 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Oct 2025 |
| 33157 | Zephyr SWD LLC | Oklahoma City, OK 73118-6035 | Oil Operator | Oct 2025 |
| 33158 | Zerbst James E | | Oil & Gas Operator | Apr 2007 |
| 33159 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |
| 33160 | Zero Mass Mining, LLC | | Oil Operator | Jan 2025 |
| 33161 | Zeta Energy LLC | Ashland, OR 97520 | Oil Operator | Jun 2025 |
| 33162 | Zetetic Partners, LTD. | Georgetown, TX 78626 | Oil Operator | Dec 2018 |
| 33163 | Zgen, Inc. | | Oil & Gas Operator | Jul 1990 |
| 33164 | Zia Energy Inc | The Woodlands, TX 77380 | Oil & Gas Operator | May 2005 |
| 33165 | Zia Minerals LTD Co | Andrews, TX 79714 | Oil & Gas Operator | Sep 1996 |
| 33166 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021 | Oil & Gas Operator | Dec 2021 |
| 33167 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 33168 | Zielinski, Jason H. | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 33169 | Zilhaver Brian K | Cambridge Springs, PA 16403-4114 | Gas Operator | Dec 2024 |
| 33170 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 33171 | Zilkha Energy Inc | Houston, TX 77002-5223 | Oil & Gas Operator | Dec 2008 |
| 33172 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 33173 | Zimco (Robt A Zimmerman) | Wolf Point, MT 59201 | Oil Operator | Apr 2009 |
| 33174 | Zimmerman Oil & Gas Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 33175 | Zimmerman, Aaron W. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 33176 | Zimmerman, IVan L. & Lois N. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 33177 | Zimmerman, Jon C., II | Freeland, MI 48623 | Gas Operator | Dec 2024 |
| 33178 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 33179 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 33180 | Zink Petroleum Corp | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1993 |
| 33181 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 33182 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 33183 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 33184 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 33185 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 33186 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 33187 | Zion Energy Corporation | Peru, KS 67360 | Oil Operator | Aug 2000 |
| 33188 | Zittel, Kenneth D. | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 33189 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Dec 2025 |
| 33190 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | Dec 2025 |
| 33191 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 33192 | Zlomek, John | Belmont, NY 14813 | Oil & Gas Operator | Dec 2024 |
| 33193 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 33194 | Zoe Oil & Energy, LP | Fort Worth, TX 76148 | Oil & Gas Operator | Dec 2025 |
| 33195 | Zoller & Danneberg Inc | Denver, CO 80203 | Oil & Gas Operator | May 1975 |
| 33196 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 33197 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |
| 33198 | Zonal Holding Corp. | | Oil Operator | Dec 1998 |
| 33199 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jan 2025 |
| 33200 | Zoran Oil & Gas | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2011 |