| 1 | 25 Hill Properties Inc. | | Oil Operator | Apr 2025 |
| 2 | 3MB Oil & Gas LLC | Irvine, CA 92616 | Oil & Gas Operator | Apr 2025 |
| 3 | 4H Oil Co. | | Oil Operator | Dec 1992 |
| 4 | A. J. Hayes | | Oil & Gas Operator | Dec 1998 |
| 5 | A.L.S. Resources Inc. | | Oil Operator | Dec 2004 |
| 6 | Aba Energy Corporation | | Oil & Gas Operator | May 2025 |
| 7 | Aera Energy LLC | | Oil & Gas Operator | May 2025 |
| 8 | Alanmar Energy | | Gas Operator | Jan 2018 |
| 9 | Allied Western Petroleum | | Oil & Gas Operator | Apr 2025 |
| 10 | Almond Crest Oil LLC | | Oil & Gas Operator | Apr 2025 |
| 11 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 12 | Amrich Energy Inc. | | Oil & Gas Operator | Apr 2025 |
| 13 | Anacapa Oil Corporation | | Gas Operator | Apr 2025 |
| 14 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 15 | Ancora-Verde Corporation | | Oil & Gas Operator | Dec 2004 |
| 16 | Andrew L. Newkirk | | Oil Operator | Apr 2025 |
| 17 | Angus Petroleum Corporation | Chicago, IL 60660 | Oil & Gas Operator | Dec 2022 |
| 18 | Ann Marie Tiers | | Oil Operator | Dec 1996 |
| 19 | Anterra Services Inc. | | Oil & Gas Operator | Apr 2025 |
| 20 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 21 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 22 | Arco Western Energy Co. | | Oil & Gas Operator | Dec 1999 |
| 23 | Argo Petroleum Corporation | | Oil & Gas Operator | Dec 1989 |
| 24 | Armca Oil & Gas LLC | | Oil Operator | May 2025 |
| 25 | Armstrong Petroleum Corporation | | Oil & Gas Operator | Apr 2025 |
| 26 | Arthur McAdams | | Oil & Gas Operator | Apr 2025 |
| 27 | Ashe Road Properties L.P. | | Oil & Gas Operator | Dec 2009 |
| 28 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 29 | Atlantic Oil Company | | Oil & Gas Operator | Apr 2025 |
| 30 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 31 | Austin Oil Company | | Oil & Gas Operator | Dec 2000 |
| 32 | B & L Pump & Supply Company | | Oil & Gas Operator | Apr 2025 |
| 33 | B & S Oil Company | Kermit, TX 79745 | Oil & Gas Operator | May 2025 |
| 34 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 35 | Baker-Dickey Partnership | | Oil Operator | Dec 1992 |
| 36 | Bakersfield Energy Resources Inc. | | Oil & Gas Operator | Dec 1998 |
| 37 | Ballard Oil Inc. | | Oil & Gas Operator | May 2025 |
| 38 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 39 | Beacon Oil Company | | Oil Operator | Dec 1985 |
| 40 | Bechtel Petroleum Operations Inc. | | Oil & Gas Operator | Dec 1997 |
| 41 | Bellaire Oil Company | | Oil & Gas Operator | May 2025 |
| 42 | Bellevue Resources Inc | Lakewood, CO 80235 | Oil & Gas Operator | Feb 2009 |
| 43 | Belridge Energy Resources Inc. | | Oil & Gas Operator | May 2025 |
| 44 | Bennett Petroleum Inc. | | Oil & Gas Operator | May 2025 |
| 45 | Berkley Petroleum Inc. | | Oil & Gas Operator | Dec 2007 |
| 46 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 47 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | May 2025 |
| 48 | Big West Of California LLC | | Oil & Gas Operator | Dec 2018 |
| 49 | Black Badger Energy LLC. | | Oil Operator | May 2025 |
| 50 | Black Gold Oil Company | Duncan, OK 73533-1581 | Oil & Gas Operator | Apr 2025 |
| 51 | Black Mountain Oil Co. | | Oil & Gas Operator | Dec 1999 |
| 52 | Black Velvet Petro. Co. | | Oil & Gas Operator | Dec 2007 |
| 53 | Blackhawk Oil Co | Ottawa, KS 66067 | Oil & Gas Operator | Jan 2011 |
| 54 | Bob Crupper | | Oil Operator | Dec 1995 |
| 55 | Bob Ferguson Independent | | Oil & Gas Operator | Dec 2020 |
| 56 | Bonanza Creek Energy Operating Company LLC | | Oil & Gas Operator | May 2025 |
| 57 | Brea Oil Company Inc. | | Oil & Gas Operator | Oct 2001 |
| 58 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 59 | Brittany Oil Co. | | Oil & Gas Operator | Dec 2022 |
| 60 | Brknco LLC | | Oil & Gas Operator | Dec 2025 |
| 61 | Brogdon--A&K Leases | | Oil & Gas Operator | Dec 2001 |
| 62 | Bruce A. Holmes | | Oil & Gas Operator | Dec 2022 |
| 63 | Bruce Anderson | | Oil Operator | Dec 1998 |
| 64 | Bud'S Oil Company Inc. | Sperry, OK 74073 | Oil & Gas Operator | Dec 2025 |
| 65 | C & J Oil | | Oil & Gas Operator | Apr 2025 |
| 66 | C & M Oil Co. & Investments | | Oil & Gas Operator | Apr 2025 |
| 67 | C. C. Killingsworth Opr. | | Oil Operator | Dec 1999 |
| 68 | Caac 100 LLC | | Oil & Gas Operator | Apr 2025 |
| 69 | Caballero Operations LLC | | Oil & Gas Operator | May 2025 |
| 70 | Caleco LLC | | Oil & Gas Operator | Apr 2025 |
| 71 | California Petroleum Group Inc. | | Oil Operator | Apr 2025 |
| 72 | California Resources Elk Hills LLC | | Oil & Gas Operator | May 2025 |
| 73 | California Resources Production Corporation | | Oil & Gas Operator | Apr 2025 |
| 74 | Calresources LLC | | Oil & Gas Operator | Dec 1996 |
| 75 | Camtex Industries Inc. | | Oil Operator | Dec 1996 |
| 76 | Capco Resource Corporation | Orange,, CA 92869 | Oil Operator | Sep 2007 |
| 77 | Capital Production Company | | Oil Operator | Dec 1997 |
| 78 | Capitol Oil Corporation | | Oil & Gas Operator | Apr 2025 |
| 79 | Casex Company | | Oil & Gas Operator | Dec 2007 |
| 80 | Cather-Herley Oil Company | | Oil & Gas Operator | May 2025 |
| 81 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 82 | Cemco-Edison No. 1 (F.R.) Partnership | | Oil & Gas Operator | Dec 2000 |
| 83 | Central California Oil Co. | Fish Camp, CA 93623 | Oil & Gas Operator | May 2025 |
| 84 | Central Lease Inc. | | Oil & Gas Operator | Dec 1998 |
| 85 | Central Pacific Resources | | Oil Operator | May 2025 |
| 86 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 87 | Century Exploration Resources LLC | | Oil & Gas Operator | Dec 2015 |
| 88 | CFT Oil & Gas LLC | | Oil Operator | May 2025 |
| 89 | Challenger Minerals Inc. | | Oil & Gas Operator | Dec 1991 |
| 90 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 91 | Channel Exploration Company | | Oil & Gas Operator | Feb 1997 |
| 92 | Chaparral Petroleum Inc. | | Oil Operator | Apr 2025 |
| 93 | Charles W. Hinesley | | Oil & Gas Operator | Dec 1991 |
| 94 | Chester F. Dolley | | Oil & Gas Operator | Dec 1986 |
| 95 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 96 | Citadel Exploration Inc. | | Oil Operator | Apr 2025 |
| 97 | Clearfield Energy Resources & Management Inc. | | Oil & Gas Operator | Dec 1998 |
| 98 | Cmo Inc. | | Oil Operator | May 2025 |
| 99 | Coffee Petroleum | | Oil & Gas Operator | Apr 2025 |
| 100 | Commander Oil Company LTD. | | Oil & Gas Operator | Dec 2021 |