| 1 | Z & L Oil LLC | Longton, KS 67352 | Oil Operator | Sep 2018 |
| 2 | Z & S Construction Co | | Oil Operator | Dec 2017 |
| 3 | Z C Ambrose-G L Blaxton, Jr. | | Oil & Gas Operator | Mar 1980 |
| 4 | Z Oil Company | Burgettstown, PA 15021-0000 | Oil & Gas Operator | Dec 2017 |
| 5 | Z&G Operating | | Oil Operator | Sep 2011 |
| 6 | Z/F Little Buddy, L.P. | | Gas Operator | Sep 2000 |
| 7 | Zachary Oil Operating Company | Eunice, NM 88231 | Oil & Gas Operator | Sep 2018 |
| 8 | Zachris, Inc. | Mansfield, TX 76063 | Oil Operator | Jan 2019 |
| 9 | Zachry Exploration, Inc. | | Oil & Gas Operator | Jan 2019 |
| 10 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Jan 2019 |
| 11 | Zachry Exploration, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Jan 2009 |
| 12 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Jan 2019 |
| 13 | Zachry Operating | | Oil & Gas Operator | Jan 2011 |
| 14 | Zachry, H. B. Company | | Gas Operator | Apr 1994 |
| 15 | Zackson Resources, Inc. | | Gas Operator | Jan 2019 |
| 16 | Zadeck Energy Group | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 17 | Zadeck Energy Group Inc | | Oil & Gas Operator | Jun 2013 |
| 18 | Zaf Oil | | Oil & Gas Operator | Aug 2002 |
| 19 | Zajac Oil Co. | | Oil & Gas Operator | Jan 2019 |
| 20 | Zama Petro Inc | Clinton, WA 98236-0100 | Oil & Gas Operator | Dec 2016 |
| 21 | Zander H Corpora | | Oil & Gas Operator | Oct 1985 |
| 22 | Zapata-Fender, L. L. C. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2001 |
| 23 | Zargon Oil (ND) Inc. | | Oil & Gas Operator | Nov 2018 |
| 24 | Zarko Exploration, LLC | | Gas Operator | Jun 2018 |
| 25 | Zarvona Energy LLC | Houston, TX 77002-6334 | Oil & Gas Operator | Jan 2019 |
| 26 | Zavala Independent Gas, Inc. | | Oil & Gas Operator | Oct 2007 |
| 27 | Zavanna, LLC | | Oil & Gas Operator | Nov 2018 |
| 28 | Zaveri Oil & Gas LTD | Albany, KY 42602 | Oil Operator | Dec 2006 |
| 29 | Zaza Energy, LLC | Houston, TX 77010-3117 | Oil & Gas Operator | Jan 2019 |
| 30 | Zeal Production Company | | Gas Operator | Oct 2018 |
| 31 | Zebra Oil And Gas | | Oil & Gas Operator | Aug 2002 |
| 32 | Zebra Oil Company | El Campo, TX 77437 | Oil & Gas Operator | Jan 2019 |
| 33 | Zeiders Bros Oil & Gas Co LLC | Tulsa, OK 74152 | Oil & Gas Operator | Oct 2018 |
| 34 | Zeit Exploration Co., Inc. | | Oil & Gas Operator | Sep 2007 |
| 35 | Zelaya Oil And Gas, LLC | Premont, TX 78375 | Oil & Gas Operator | Jan 2019 |
| 36 | Zenergy Operating Co. | | Oil & Gas Operator | Oct 2018 |
| 37 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2018 |
| 38 | Zenergy, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 39 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 40 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Sep 2018 |
| 41 | Zenith Exploration Co Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2014 |
| 42 | Zenith Oil & Gas Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 43 | Zenith Oil & Gas LLC | | Oil & Gas Operator | Nov 2018 |
| 44 | Zentz'S Well Service Inc. | Mayville, NY 14757 | Oil Operator | Dec 2017 |
| 45 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2019 |
| 46 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Nov 2018 |
| 47 | Zercon Oil & Gas, Inc. | | Oil Operator | Oct 2003 |
| 48 | Zetetic Partners, LTD. | Georgetown, TX 78626 | Oil Operator | Jul 2018 |
| 49 | Zgen, Inc. | | Oil & Gas Operator | Jun 1990 |
| 50 | Zia Energy Inc | The Woodlands, TX 77380 | Oil & Gas Operator | May 2005 |
| 51 | Zia Minerals LTD Co | Andrews, TX 79714 | Oil & Gas Operator | Sep 1996 |
| 52 | Zickefoose, R. L. And W.F. | Burgettstown, PA 15021-0000 | Oil & Gas Operator | Dec 2017 |
| 53 | Ziegler-Peru, Inc. | Houston, TX 77019 | Oil & Gas Operator | Jan 2019 |
| 54 | Zilhaver Brian K | Cambridge Springs, PA 16403-4114 | Gas Operator | Dec 2017 |
| 55 | Zilkha Energy Company | Houston, TX 77002-5223 | Oil & Gas Operator | Dec 2009 |
| 56 | Zilkha Energy Inc | Houston, TX 77002-5223 | Oil & Gas Operator | Dec 2008 |
| 57 | Zimco (Robt A Zimmerman) | Wolf Point, MT 59201 | Oil Operator | Apr 2009 |
| 58 | Zimmerman Oil & Gas Exploration, Inc. | Lovington, NM 88260 | Oil & Gas Operator | May 2018 |
| 59 | Zimmerman, Aaron W. | Penn Yan, NY 14527 | Gas Operator | Dec 2017 |
| 60 | Zimmerman, Wayne W. And Pauline R. | Penn Yann, NY 14527 | Gas Operator | Dec 2017 |
| 61 | Zimtex Energy LLC | | Oil & Gas Operator | Oct 2015 |
| 62 | Zink Petroleum Corp | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1993 |
| 63 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |
| 64 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1994 |
| 65 | Zinke & Trumbo, Inc. | | Oil & Gas Operator | Mar 2007 |
| 66 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Jan 2019 |
| 67 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Sep 2018 |
| 68 | Zinszer Oil Comp | | Oil Operator | Aug 1985 |
| 69 | Zittel, Kenneth D. | Springville, NY 14141 | Gas Operator | Dec 2017 |
| 70 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Jan 2019 |
| 71 | ZK Petroleum Co., L.L.C. | Stafford, TX 77497 | Oil Operator | Jan 2019 |
| 72 | Zlab, Adolph | Yates Center, KS 66783 | Oil Operator | Jul 1997 |
| 73 | Zlomek, John | Belmont, NY 14813 | Oil & Gas Operator | Dec 2016 |
| 74 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |
| 75 | Zoe Oil & Energy, LP | | Oil & Gas Operator | Jan 2019 |
| 76 | Zoller & Danneberg Inc | Denver, CO 80203 | Oil & Gas Operator | May 1975 |
| 77 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Oct 2015 |
| 78 | Zonal Holding Corporation | | Oil Operator | Dec 1998 |
| 79 | Zone Energy, LLC | Houston, TX 77251-1908 | Oil & Gas Operator | Jul 2015 |
| 80 | Zoran Oil & Gas | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2011 |
| 81 | Zoran Oil & Gas Co | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2017 |
| 82 | Zorger, Gerald W. | Wichita, KS 67202 | Oil & Gas Operator | Apr 1985 |
| 83 | Zorra Oil & Gas | Dilley, TX 78017 | Oil & Gas Operator | Jan 2019 |
| 84 | ZP Disposal Systems LLC | Kingfisher, OK 73750-7084 | Oil Operator | Jun 2018 |
| 85 | ZSX, Inc. | | Oil & Gas Operator | Jul 1997 |
| 86 | ZTC Petro Investments LP | Houston, TX 77056 | Oil & Gas Operator | Jan 2019 |
| 87 | Zu, LLC | Hays, KS 67601 | Oil Operator | Sep 2018 |
| 88 | ZZ Energy LLC | Norman, OK 73070-4531 | Gas Operator | Nov 2018 |