| 1 | Aba Energy Corporation | | Oil & Gas Operator | Nov 2025 |
| 2 | Arcady Oil Company | | Gas Operator | Dec 1989 |
| 3 | Argo Petroleum Corporation | | Oil & Gas Operator | Dec 1989 |
| 4 | Arkoma Production Company Of California | | Oil & Gas Operator | Dec 1993 |
| 5 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 6 | California Resources Production Corporation | | Oil & Gas Operator | Nov 2025 |
| 7 | Capitol Oil Corporation | | Oil & Gas Operator | Oct 2025 |
| 8 | Castle Minerals | | Oil & Gas Operator | Dec 2018 |
| 9 | Century Production Inc | | Oil & Gas Operator | Dec 1986 |
| 10 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 11 | Crimson Resource Management Corp. | | Oil & Gas Operator | Nov 2025 |
| 12 | Diversified Resources LLC | | Gas Operator | Oct 2025 |
| 13 | Enerfin Resources Northwest Limited Partnership | | Oil & Gas Operator | Jan 2022 |
| 14 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 15 | Fisk Family Farms LLC | | Gas Operator | Nov 2025 |
| 16 | Foothill Energy, LLC | Spring, TX 77393 | Oil & Gas Operator | Feb 2026 |
| 17 | G-W Resources Oper. Co. | | Gas Operator | Dec 1995 |
| 18 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 19 | Great Basins Petroleum Co | | Gas Operator | Mar 2015 |
| 20 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 21 | Hexadyne Energy Corp. | | Oil & Gas Operator | Dec 2013 |
| 22 | J. D. Hunt | | Gas Operator | Oct 2025 |
| 23 | Kelpetro Operating Inc. | | Oil & Gas Operator | Dec 2021 |
| 24 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Nov 2025 |
| 25 | Laymac Corporation | | Gas Operator | Dec 2020 |
| 26 | Lodi Gas Storage L.L.C. | | Gas Operator | Nov 2025 |
| 27 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 28 | Mattco Petroleum | | Oil & Gas Operator | Dec 1988 |
| 29 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 30 | Nahama & Weagant Energy Company | | Oil & Gas Operator | Dec 1997 |
| 31 | Northstar Resources Inc. | | Gas Operator | Oct 2025 |
| 32 | Occidental Petroleum Corporation | | Oil & Gas Operator | Dec 2021 |
| 33 | Pacific Gas And Electric Company | | Gas Operator | Nov 2025 |
| 34 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 35 | Polaris Production Inc. | | Oil & Gas Operator | Feb 2021 |
| 36 | Princeton Natural Gas LLC | | Gas Operator | Oct 2025 |
| 37 | Pueblo Oil & Gas Inc. | | Gas Operator | Dec 2003 |
| 38 | Royale Energy Inc | San Diego, CA 92108-4518 | Oil & Gas Operator | Nov 2025 |
| 39 | Sacramento Energy Inc. | | Oil & Gas Operator | Oct 2025 |
| 40 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 41 | San Carlos Oil & Gas Corp. | | Gas Operator | Dec 2003 |
| 42 | Sierra Resources, Inc. | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2025 |
| 43 | Son Petroleum | Bakersfield, CA 93309 | Oil & Gas Operator | Mar 1994 |
| 44 | Source Energy Corp. | | Gas Operator | Aug 2022 |
| 45 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 46 | Summit Exploration (California) LLC | | Oil & Gas Operator | Feb 2018 |
| 47 | Towne Exploration Company LP | | Oil & Gas Operator | Nov 2025 |
| 48 | Tri-Valley Oil & Gas Co. | | Oil & Gas Operator | Oct 2025 |
| 49 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 50 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 51 | United Energy, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Dec 2002 |
| 52 | Venada National | | Oil & Gas Operator | Dec 2010 |
| 53 | Venoco LLC | | Oil & Gas Operator | Oct 2025 |
| 54 | Vintage Production California LLC | | Oil & Gas Operator | Jun 2016 |