| 1 | American Barter Petroleum Inc. | | Oil & Gas Operator | Jun 1993 |
| 2 | California Resources Production Corporation | | Oil & Gas Operator | Jul 2025 |
| 3 | Central California Oil Co. | Fish Camp, CA 93623 | Oil & Gas Operator | Aug 2025 |
| 4 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 5 | Compass Global Resources LLC | | Oil & Gas Operator | Dec 2015 |
| 6 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 7 | Freedom Oil Company LLC | | Oil Operator | Jul 2025 |
| 8 | G.E.N.Y. Operations | | Oil & Gas Operator | Dec 1999 |
| 9 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 10 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Oct 2025 |
| 11 | Holmes Western Oil Corporation | | Oil & Gas Operator | Aug 2025 |
| 12 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 13 | Innex California Inc. | | Oil & Gas Operator | Jul 2025 |
| 14 | J.P. Oil Company LLC | | Oil & Gas Operator | Jul 2025 |
| 15 | KMD Operating Company LLC | | Oil & Gas Operator | Dec 2015 |
| 16 | Marlin Pacific Oil & Gas | | Oil & Gas Operator | Dec 2003 |
| 17 | Mission Resources | | Oil & Gas Operator | Dec 1991 |
| 18 | Nahama & Weagant Energy Company | | Oil & Gas Operator | Dec 1997 |
| 19 | Nordic Oil Company | | Oil & Gas Operator | Dec 1999 |
| 20 | Strata-X Inc. | | Oil & Gas Operator | Jul 2025 |
| 21 | Sunset Exploration Inc. | | Oil & Gas Operator | Jul 2025 |
| 22 | Tatum Petroleum Corporation | Zanesville, OH 43702 | Oil & Gas Operator | Dec 2008 |
| 23 | Thurner Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 24 | Transco Oil & Gas Inc. | | Gas Operator | Dec 1992 |
| 25 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 26 | Vintage Production California LLC | | Oil & Gas Operator | Jun 2016 |
| 27 | Western States International Inc. | | Oil & Gas Operator | Jul 2025 |
| 28 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | Oct 2025 |