| 1 | Aberdeen American Petroleum Co., Inc. | | Oil & Gas Operator | Nov 1989 |
| 2 | Al Merit Energy Co., Inc. | | Oil & Gas Operator | Jun 2015 |
| 3 | Alabama Energy Group, Inc. | | Oil & Gas Operator | Aug 1986 |
| 4 | Alog, LLC | Brewton, AL 36427 | Oil & Gas Operator | Dec 2020 |
| 5 | Amax Oil & Gas Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2009 |
| 6 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Feb 2016 |
| 7 | American Quasar Petroleum Co. | Midland, TX 79705 | Oil & Gas Operator | Jun 1987 |
| 8 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 9 | Anderman/Smith Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Jan 1999 |
| 10 | Anderson, Arden A. | | Oil & Gas Operator | Jun 1970 |
| 11 | Ankor E&P Holdings Corporation | | Oil & Gas Operator | Jul 2018 |
| 12 | Araxas Exploration, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 13 | Arco Oil & Gas Co., Div. Of Atlantic Richfield | | Oil & Gas Operator | Jul 1992 |
| 14 | Aroc (Texas) Inc. | Houston, TX 77090 | Oil & Gas Operator | May 2008 |
| 15 | Arp Production Company, LLC | Fort Worth, TX 76116 | Gas Operator | Dec 2020 |
| 16 | Bam Energy, Inc. | | Gas Operator | Oct 1990 |
| 17 | Barnes Oil & Gas, Inc. | | Gas Operator | Jun 1991 |
| 18 | Bay City Minerals, Inc. | | Gas Operator | May 1990 |
| 19 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2021 |
| 20 | Belden & Blake Corporation | North Canton, OH 44720-0500 | Oil & Gas Operator | Dec 2016 |
| 21 | Bernard/Hickox, Inc. | | Oil & Gas Operator | May 1998 |
| 22 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Apr 2021 |
| 23 | Black Rock Operating, L.L.C. | Fayette, AL 35555 | Oil & Gas Operator | Dec 2020 |
| 24 | Black Warrior Methane Corp. | Brookwood, AL 35444 | Gas Operator | Dec 2020 |
| 25 | Block T Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2020 |
| 26 | Boots Smith Oilfield Services, LLC | | Oil & Gas Operator | Dec 2006 |
| 27 | Bridge Oil Company, L. P. | Midland, TX 79702 | Oil & Gas Operator | Mar 2011 |
| 28 | Browning & Welch, Inc | | Oil & Gas Operator | Mar 2005 |
| 29 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 30 | Calera Gas LLC | Montevallo, AL 35115 | Gas Operator | Dec 2020 |
| 31 | Calhoun, Clay | | Gas Operator | Sep 1989 |
| 32 | Callon Petroleum Co. | | Oil & Gas Operator | Oct 2002 |
| 33 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Apr 2021 |
| 34 | Carless Resources Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1997 |
| 35 | Carter Oil Co | | Oil & Gas Operator | Dec 2013 |
| 36 | Cci Robinson'S Bend LLC | | Gas Operator | Dec 2020 |
| 37 | Cedarhill Operating Co LLC | | Oil & Gas Operator | Dec 2007 |
| 38 | Cherry, Charles L. & Assoc., Inc. | | Oil & Gas Operator | Oct 1989 |
| 39 | Chevron Oil Company | | Oil & Gas Operator | Dec 1983 |
| 40 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2021 |
| 41 | Choctaw Holdings, Inc. | | Oil Operator | Dec 1974 |
| 42 | Citmoco Services, Inc. | | Oil Operator | Jan 1971 |
| 43 | Citronelle Operating Co., LLC | | Oil & Gas Operator | Sep 1997 |
| 44 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2015 |
| 45 | Coaltech, Inc. | | Gas Operator | Jun 1993 |
| 46 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 47 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2021 |
| 48 | Collet Oil Ventures, Inc. | | Oil & Gas Operator | Oct 1988 |
| 49 | Columbia Petroleum LLC | Brookhaven, MS 39601 | Oil & Gas Operator | Dec 2020 |
| 50 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 1997 |
| 51 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 52 | Crosbys Creek Oil & Gas, LLC | Ridgeland, MS 39157 | Oil & Gas Operator | Dec 2020 |
| 53 | Currie, V. Monta, Jr. | | Gas Operator | Nov 1990 |
| 54 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Sep 2014 |
| 55 | Dan A. Hughes Company, L.P. | Beeville, TX 78102 | Oil & Gas Operator | Dec 2020 |
| 56 | Daybreak Oil And Gas, Inc. | | Oil & Gas Operator | Feb 2021 |
| 57 | Dcor, L.L.C. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2021 |
| 58 | De Soto Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2006 |
| 59 | De Soto Oil Properties, LLC | | Oil & Gas Operator | Dec 2020 |
| 60 | Delco Operating Company LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 61 | Delphi Oil Inc. | Delphi, IN 46923 | Oil & Gas Operator | Dec 2020 |
| 62 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2021 |
| 63 | Dixon Management Corp. | | Oil & Gas Operator | May 1984 |
| 64 | Duer Wagner & Company | | Oil & Gas Operator | Dec 2000 |
| 65 | Durango Operating LLC | Ridgeland, MS 39157-5109 | Oil & Gas Operator | Feb 2021 |
| 66 | Edge Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 1999 |
| 67 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2018 |
| 68 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2018 |
| 69 | El-Oil, LTD. | | Oil & Gas Operator | Jul 2018 |
| 70 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 71 | Energy Recovery Group, LLC | | Oil & Gas Operator | Aug 2008 |
| 72 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2021 |
| 73 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 74 | Eor LLC | | Oil & Gas Operator | Dec 2014 |
| 75 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Apr 2021 |
| 76 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 77 | Escambia Operating Co., LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2020 |
| 78 | Esco Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2009 |
| 79 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Sep 2016 |
| 80 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2021 |
| 81 | Fairways Exploration & Production, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2021 |
| 82 | Federal Hill Land Co., Inc. | | Gas Operator | Apr 1991 |
| 83 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 84 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2021 |
| 85 | Flare Inc | | Oil & Gas Operator | Jul 1995 |
| 86 | Fletcher Petroleum Corp. | Fairhope, AL 36533 | Oil & Gas Operator | Apr 2021 |
| 87 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Dec 2015 |
| 88 | FMP Operating Co., LTD. PTN. | | Oil & Gas Operator | Sep 1999 |
| 89 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Oct 2012 |
| 90 | Foshee Operating, LLC | | Oil & Gas Operator | Jun 2004 |
| 91 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2020 |
| 92 | Freebird Gas Storage, LLC | Houston, TX 77070 | Gas Operator | May 2000 |
| 93 | Gas Processors, Inc. | Columbia, MS 39429 | Oil & Gas Operator | Apr 2019 |
| 94 | Geomet Operating Co., Inc. | | Gas Operator | Dec 2013 |
| 95 | Germany Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2002 |
| 96 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Aug 2018 |
| 97 | Gibraltar Energy Co., Inc. & Richard H. Mason | | Gas Operator | Aug 1995 |
| 98 | Gibraltar Energy Company | | Oil & Gas Operator | Jan 2021 |
| 99 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2007 |
| 100 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |