| 1 | Amerada Hess Corp. Unit Operator | | Oil & Gas Operator | Dec 1986 |
| 2 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 3 | Argo Petroleum Corporation | | Oil & Gas Operator | Dec 1989 |
| 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 | Sep 2024 |
| 7 | Black Mountain Oil Co. | | Oil & Gas Operator | Dec 1999 |
| 8 | California Resources Production Corporation | | Oil & Gas Operator | Oct 2024 |
| 9 | Capitol Oil Corporation | | Oil & Gas Operator | Sep 2024 |
| 10 | Castle Minerals | | Oil & Gas Operator | Dec 2018 |
| 11 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 12 | Enerfin Resources Northwest Limited Partnership | | Oil & Gas Operator | Jan 2022 |
| 13 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 14 | Estate Of L. C. Dougan | | Gas Operator | Dec 1987 |
| 15 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 16 | Jim Graham | | Oil & Gas Operator | Jan 2018 |
| 17 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Oct 2024 |
| 18 | Longbow LLC | | Oil & Gas Operator | Oct 2024 |
| 19 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 20 | Nahama & Weagant Energy Company | | Oil & Gas Operator | Dec 1997 |
| 21 | Natural Gas Corp. Of Calif. | | Oil & Gas Operator | Dec 1987 |
| 22 | Occidental Petroleum Corporation | | Oil & Gas Operator | Dec 2021 |
| 23 | Output Exploration LLC | | Oil & Gas Operator | Dec 2006 |
| 24 | Peoco LLC | | Gas Operator | Sep 2024 |
| 25 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 26 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 27 | Robert A. Cohan | | Oil & Gas Operator | Jan 2018 |
| 28 | Romara Energy Inc. | | Oil & Gas Operator | Dec 2017 |
| 29 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2024 |
| 30 | Royale Energy Inc | San Diego, CA 92108-4518 | Oil & Gas Operator | Oct 2024 |
| 31 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 32 | Signal Hill Petroleum Inc. | | Oil & Gas Operator | Sep 2024 |
| 33 | Source Energy Corp. | | Gas Operator | Aug 2022 |
| 34 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2024 |
| 35 | Summit Exploration (California) LLC | | Oil & Gas Operator | Feb 2018 |
| 36 | The Procter And Gamble Co. | | Gas Operator | Dec 1989 |
| 37 | Towne Exploration Company LP | | Oil & Gas Operator | Oct 2024 |
| 38 | Tri-Valley Oil & Gas Co. | | Oil & Gas Operator | Sep 2024 |
| 39 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 40 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 41 | Venada National | | Oil & Gas Operator | Dec 2010 |
| 42 | Vintage Production California LLC | | Oil & Gas Operator | Jun 2016 |