| 1 | 442 Operating La, LLC | | Oil & Gas Operator | Jun 2024 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Nov 2024 |
| 3 | Acadian Gas Pipeline System | | Oil Operator | Jul 2024 |
| 4 | Acadiana Reserves, Inc. | | Oil & Gas Operator | Oct 1984 |
| 5 | Ada Oil Exploration Corp | | Oil & Gas Operator | Jan 1986 |
| 6 | Adobe Energy Company | | Oil & Gas Operator | Sep 2010 |
| 7 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 8 | Affiliated Holdings, Inc. | | Oil Operator | Dec 2010 |
| 9 | Alliance Operating Corporation | | Oil & Gas Operator | Jan 1995 |
| 10 | Alpine Expl. Companies, Inc. | | Oil & Gas Operator | Jan 2024 |
| 11 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 12 | Amarex Inc | | Oil & Gas Operator | Dec 1996 |
| 13 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 14 | Amerada Hess-Ethyl Corporation | | Oil & Gas Operator | Sep 1990 |
| 15 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 16 | American Exploration Oper. Co. | | Oil & Gas Operator | May 1990 |
| 17 | American National Petroleum Co. | Houston, TX 77057 | Oil & Gas Operator | Aug 1995 |
| 18 | American Quasar Petroleum Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2014 |
| 19 | American Trading & Prod Corp | Houston, TX 77040-6471 | Oil & Gas Operator | Nov 2014 |
| 20 | Aminoil Of Louisiana, Inc. | | Oil & Gas Operator | Dec 1981 |
| 21 | Aminoil USA Inc | | Oil & Gas Operator | Jan 1985 |
| 22 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 23 | Ampolex (Texas), Inc. | | Oil & Gas Operator | May 1993 |
| 24 | An-Son Corporation | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 25 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 26 | Anderson Exploration Co., Inc. | | Oil & Gas Operator | Sep 2023 |
| 27 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 28 | Apache Shelf, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jan 2014 |
| 29 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 30 | Araxas Exploration, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 31 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 32 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 33 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 34 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 35 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 36 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2022 |
| 37 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 38 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 39 | Austral Oil & Exploration, Inc | | Oil & Gas Operator | Jun 2004 |
| 40 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 41 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 42 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 43 | B K L Incorporated | Morton, TX 79346 | Oil & Gas Operator | Jun 2002 |
| 44 | B M Oil, Inc. | | Oil & Gas Operator | May 2019 |
| 45 | B&L Exploration, L.L.C. | Metairie, LA 70001 | Oil & Gas Operator | Nov 2024 |
| 46 | Baby Oil, Inc. | | Oil & Gas Operator | Oct 2017 |
| 47 | Badger Energy LLC | | Oil & Gas Operator | Jul 2024 |
| 48 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 49 | Balco Energy Corporation | | Oil & Gas Operator | Jul 1983 |
| 50 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 51 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 52 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 53 | Bay Coquille, Inc. | | Oil & Gas Operator | Jun 2023 |
| 54 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 55 | Bepco, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2008 |
| 56 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 57 | Billingsley Engineering Co. | | Oil & Gas Operator | May 1994 |
| 58 | Bison Energy Partners, LLC | | Oil & Gas Operator | Aug 2023 |
| 59 | Bke-Theall, LLC | | Oil & Gas Operator | Feb 2000 |
| 60 | Black Gold Production Company | | Oil & Gas Operator | Feb 1998 |
| 61 | Blackjack Operating L. L. C. | Schertz, TX 78154 | Oil & Gas Operator | Nov 2024 |
| 62 | Bois D'Arc Offshore LTD. | Houston, TX 77002 | Oil & Gas Operator | Aug 2008 |
| 63 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 64 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 65 | Bradco Oil & Gas Company | | Oil & Gas Operator | Dec 1980 |
| 66 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2024 |
| 67 | Brbco, LLC | | Oil & Gas Operator | Jun 2024 |
| 68 | Brock Petroleum Corporation | | Oil & Gas Operator | Sep 1984 |
| 69 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2024 |
| 70 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 71 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 72 | Burlington Res Oil & Gas LP | Houston, TX 77079 | Oil & Gas Operator | Sep 2024 |
| 73 | Cajun Minerals, Inc. | | Oil & Gas Operator | Mar 1997 |
| 74 | Cajun Operating, Inc. | | Oil & Gas Operator | Jun 2011 |
| 75 | Cambridge Energy Corporation | | Oil & Gas Operator | Jul 2003 |
| 76 | Camex Operating Company | | Oil & Gas Operator | Jun 2024 |
| 77 | Camex, Inc. | | Oil & Gas Operator | Jun 1992 |
| 78 | Canlan Oil Company | | Oil & Gas Operator | Mar 1992 |
| 79 | Cardinal Oil & Gas, Inc. | | Oil & Gas Operator | Jun 1995 |
| 80 | Caribbean Oil & Gas Corp | | Oil & Gas Operator | Mar 1980 |
| 81 | Caribe Resources, Inc. | | Oil & Gas Operator | Jan 1985 |
| 82 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 83 | Cashco Energy Corporation | | Oil & Gas Operator | Feb 1982 |
| 84 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 85 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Nov 2024 |
| 86 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 87 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 88 | Cedyco Corporation | Houston, TX 77227 | Oil & Gas Operator | Nov 2008 |
| 89 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 90 | Cenco, Inc. | | Oil & Gas Operator | Mar 2022 |
| 91 | Century Exploration Company | | Oil & Gas Operator | Dec 2003 |
| 92 | Century Offshore MGMT. Corp. | | Oil & Gas Operator | Dec 1999 |
| 93 | Charles Holston, Inc. | | Oil Operator | Jul 2024 |
| 94 | Cheniere Petroleum Corporation | | Oil & Gas Operator | Feb 1989 |
| 95 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2024 |
| 96 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 97 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 98 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 99 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Nov 2024 |
| 100 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |