| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | 442 Operating La, LLC | | Oil & Gas Operator | Jun 2024 |
| 3 | Acadian Gas Pipeline System | | Oil Operator | Jul 2024 |
| 4 | Acadiana Reserves, Inc. | | Oil & Gas Operator | Oct 1984 |
| 5 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Nov 2024 |
| 6 | Allied-Gulf Energy, LLC | Lafayette, LA 70508 | Oil & Gas Operator | Nov 2024 |
| 7 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Nov 2024 |
| 8 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 9 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 10 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 11 | American Exploration Oper. Co. | | Oil & Gas Operator | May 1990 |
| 12 | American Explorer, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Jan 1999 |
| 13 | American Petrofina Co Of Texas | | Oil & Gas Operator | Jun 1985 |
| 14 | Aminoil Of Louisiana, Inc. | | Oil & Gas Operator | Dec 1981 |
| 15 | Aminoil USA Inc | | Oil & Gas Operator | Jan 1985 |
| 16 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 17 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 18 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Aug 2024 |
| 19 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 20 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 21 | Apd Company | | Oil & Gas Operator | Apr 1987 |
| 22 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 23 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 24 | Array Operating, LLC | | Oil & Gas Operator | Mar 2017 |
| 25 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 26 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2022 |
| 27 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 28 | Atlas Production Services | | Oil & Gas Operator | Feb 1999 |
| 29 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 30 | B&L Exploration, L.L.C. | Metairie, LA 70001 | Oil & Gas Operator | Nov 2024 |
| 31 | Baby Oil, Inc. | | Oil & Gas Operator | Oct 2017 |
| 32 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 33 | Barton Oil & Gas Co., Inc. | | Oil & Gas Operator | Sep 1993 |
| 34 | Baruch-Foster Corporation | Oklahoma City, OK 73126-6770 | Oil & Gas Operator | Feb 2001 |
| 35 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 36 | Beem Oil & Gas Company | | Oil & Gas Operator | Dec 1994 |
| 37 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 38 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 39 | Black Elk Energy Offshore Operations LLC | | Oil & Gas Operator | Jun 2016 |
| 40 | Bois D'Arc Offshore LTD. | Houston, TX 77002 | Oil & Gas Operator | Aug 2008 |
| 41 | Bois D'Arc Operating Corporation | Houston, TX 77040 | Oil & Gas Operator | Jan 2000 |
| 42 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 43 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2024 |
| 44 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 45 | Britlind Oil LLC | | Oil & Gas Operator | Dec 2020 |
| 46 | Brock Exploration Corporation | New Orleans, LA 70112-1707 | Oil & Gas Operator | Jan 1999 |
| 47 | Brock Petroleum Corporation | | Oil & Gas Operator | Sep 1984 |
| 48 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2024 |
| 49 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 50 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 51 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 52 | Burlington Res Oil & Gas LP | Houston, TX 77079 | Oil & Gas Operator | Jun 2024 |
| 53 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 54 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 55 | C & K Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 1984 |
| 56 | C & VC, Inc. | | Oil & Gas Operator | Sep 1991 |
| 57 | C&M Operating Company, LLC | | Oil & Gas Operator | Apr 2011 |
| 58 | C.F. Braun & Company | | Oil & Gas Operator | Dec 1986 |
| 59 | C.F.D. Inc. | | Oil & Gas Operator | Nov 1988 |
| 60 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jul 2024 |
| 61 | Caddo Management, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2024 |
| 62 | Callon Offshore Production, Inc. | Natchez, MS 39121 | Oil & Gas Operator | Dec 2005 |
| 63 | Cambridge Energy Corporation | | Oil & Gas Operator | Jul 2003 |
| 64 | Caribbean Oil & Gas Corp | | Oil & Gas Operator | Mar 1980 |
| 65 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 66 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 67 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 68 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 69 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 70 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 71 | Caza Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 72 | Cei Production Company | Dallas, TX 75225 | Oil & Gas Operator | Sep 1998 |
| 73 | Cel Properties LLC | | Oil & Gas Operator | Jul 2024 |
| 74 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 75 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 76 | Centurion Exploration Company | Houston, TX 77042 | Oil & Gas Operator | May 2009 |
| 77 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 78 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2024 |
| 79 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 80 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 81 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 82 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 83 | Clark Oil Producing Company | | Oil & Gas Operator | Oct 1979 |
| 84 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 85 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 86 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 87 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 88 | Coastal States & Emerald Oil | | Oil & Gas Operator | Dec 1979 |
| 89 | Comstock Offshore, LLC | | Oil & Gas Operator | Nov 2004 |
| 90 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 91 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 92 | Contango Operators, Inc. | Houston, TX 77098 | Oil & Gas Operator | Dec 2022 |
| 93 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 94 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 95 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 96 | Corpus Christi Oil & Gas Co. | | Oil & Gas Operator | Dec 1991 |
| 97 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 98 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 99 | Cox Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 100 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |