| 1 | 442 Operating La, LLC | | Oil & Gas Operator | Dec 2024 |
| 2 | Acadian Gas Pipeline System | | Oil Operator | Jan 2025 |
| 3 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 4 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Dec 2025 |
| 5 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Dec 2025 |
| 6 | American Exploration Oper. Co. | | Oil & Gas Operator | May 1990 |
| 7 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 9 | Apd Company | | Oil & Gas Operator | Apr 1987 |
| 10 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 11 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 12 | Balco Energy Corporation | | Oil & Gas Operator | Jul 1983 |
| 13 | Bandera Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Dec 2025 |
| 14 | Bean Resources, Inc | | Oil & Gas Operator | Aug 2006 |
| 15 | Borden, Inc. | Columbus, OH 43215 | Oil & Gas Operator | May 1990 |
| 16 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 17 | Brock Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Jun 1986 |
| 18 | Brock Petroleum Corporation | | Oil & Gas Operator | Sep 1984 |
| 19 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 20 | Bsfi Western E & P, Inc. | | Oil & Gas Operator | Jun 2005 |
| 21 | Burlington Res Oil & Gas LP | | Oil & Gas Operator | Mar 2013 |
| 22 | Cajun Minerals, Inc. | | Oil & Gas Operator | Mar 1997 |
| 23 | Camex Operating Company | | Oil & Gas Operator | Dec 2024 |
| 24 | Cardinal Oil & Gas, Inc. | | Oil & Gas Operator | Jun 1995 |
| 25 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 26 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 27 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 28 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 29 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 30 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 31 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 32 | Conquest Exploration Co. | | Oil & Gas Operator | Mar 1992 |
| 33 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 34 | Cox Oil & Gas Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 35 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 36 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 37 | Cypress Gas Pipeline Company | | Oil Operator | Dec 1998 |
| 38 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |
| 39 | Daniel Oil Company | | Oil & Gas Operator | Jan 1983 |
| 40 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 41 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Dec 2025 |
| 42 | DBL DRLG.&Prod. Services, Inc. | | Oil & Gas Operator | Jul 1997 |
| 43 | Dow Chemical Co. | | Oil & Gas Operator | Dec 1997 |
| 44 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 45 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 46 | E & E Production Company, Inc. | | Oil & Gas Operator | Dec 2004 |
| 47 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2024 |
| 48 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 49 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Sep 2025 |
| 50 | Energy Self-Service Oils, Inc. | | Oil & Gas Operator | Apr 2009 |
| 51 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 52 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 53 | Evangeline Natural Resources, LLC | | Oil & Gas Operator | Jan 2025 |
| 54 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 55 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 56 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 57 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Dec 2025 |
| 58 | First Energy Development Corp. | | Oil & Gas Operator | Sep 2008 |
| 59 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Dec 2025 |
| 60 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 61 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 62 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 63 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 64 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | Dec 2025 |
| 65 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2025 |
| 66 | General Atlantic Energy Corp. | | Oil & Gas Operator | Nov 1988 |
| 67 | General Crude Oil Co Etal | | Oil & Gas Operator | Aug 1979 |
| 68 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 69 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 70 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 71 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 72 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Aug 2025 |
| 73 | H E C I Exploration Company | | Oil & Gas Operator | Dec 1990 |
| 74 | Hallar Enterprises, Inc. | | Oil Operator | Oct 2007 |
| 75 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 76 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 77 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 78 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 79 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 80 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2025 |
| 81 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 82 | Holleman & Parks Oil & Gas Inc | | Oil & Gas Operator | May 1995 |
| 83 | Houma Operating Company, Inc. | | Oil & Gas Operator | Jun 1998 |
| 84 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 85 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 86 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 87 | Itr Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 88 | J-Lu LTD Co | Ashdown, AR 71822 | Oil Operator | Jan 2025 |
| 89 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 90 | J.M.Huber Corp., & Kerr-McGee | | Oil & Gas Operator | Aug 1984 |
| 91 | Jimmy Roberson Energy Corp. | Texarkana, TX 75503 | Oil & Gas Operator | Sep 2012 |
| 92 | Jolen Operating Co Of La. | | Oil & Gas Operator | Dec 1993 |
| 93 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2025 |
| 94 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 95 | Knight Resources LLC | | Oil & Gas Operator | Dec 2013 |
| 96 | Knight Resources, Inc. | | Oil & Gas Operator | Dec 2011 |
| 97 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 98 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 99 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 100 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |