| 1 | Aa Production Services Inc. | | Gas Operator | Feb 2025 |
| 2 | Aba Energy Corporation | | Oil & Gas Operator | Mar 2025 |
| 3 | Argosy Oil Company | | Gas Operator | Dec 1999 |
| 4 | Arkoma Production Company Of California | | Oil & Gas Operator | Dec 1993 |
| 5 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 6 | Atlantic Oil Company | | Oil & Gas Operator | Feb 2025 |
| 7 | Caballero Operations LLC | | Oil & Gas Operator | Mar 2025 |
| 8 | California Resources Production Corporation | | Oil & Gas Operator | Mar 2025 |
| 9 | Carneros Energy Inc. | | Oil & Gas Operator | Dec 2004 |
| 10 | Crest Oil & Gas Management Corp. | | Oil & Gas Operator | Feb 2025 |
| 11 | D. E. Craggs Inc. | | Gas Operator | Dec 1993 |
| 12 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 13 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 14 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 15 | John N. Dewitt & Paul Graham | | Gas Operator | Dec 1989 |
| 16 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 17 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | May 2025 |
| 18 | Mobil Oil Exploration & Production North America Inc. | | Oil & Gas Operator | Dec 1996 |
| 19 | NGC Energy Co. | | Oil & Gas Operator | May 1989 |
| 20 | North Valley Gaswell Services | | Gas Operator | Feb 2025 |
| 21 | North Valley Oil & Gas Co. | | Oil & Gas Operator | Dec 1996 |
| 22 | Peoco LLC | | Gas Operator | Feb 2025 |
| 23 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Mar 2025 |
| 24 | Production Specialties Company | | Oil & Gas Operator | Dec 2003 |
| 25 | Royale Energy Inc | San Diego, CA 92108-4518 | Oil & Gas Operator | Mar 2025 |
| 26 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 27 | The Nahabedian Exploration Group LLC | | Oil & Gas Operator | Feb 2025 |
| 28 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Mar 2025 |
| 29 | Towne Exploration Company LP | | Oil & Gas Operator | Mar 2025 |
| 30 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 31 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 32 | Venoco LLC | | Oil & Gas Operator | Feb 2025 |
| 33 | Vintage Production California LLC | | Oil & Gas Operator | Jun 2016 |