| 1 | 25 Hill Properties Inc. | | Oil Operator | Apr 2025 |
| 2 | 260 Resource Management LLC | | Gas Operator | Apr 2025 |
| 3 | 261 Resource Management LLC | | Gas Operator | Apr 2025 |
| 4 | 3MB Oil & Gas LLC | Irvine, CA 92616 | Oil & Gas Operator | Apr 2025 |
| 5 | 4H Oil Co. | | Oil Operator | Dec 1992 |
| 6 | A. J. Hayes | | Oil & Gas Operator | Dec 1998 |
| 7 | A. L. & V. I. Grayson | | Oil Operator | Dec 1993 |
| 8 | A. S. Johnston Drilling Corp. | | Oil & Gas Operator | Dec 1987 |
| 9 | A.L.S. Resources Inc. | | Oil Operator | Dec 2004 |
| 10 | Aa Production Services Inc. | | Gas Operator | Apr 2025 |
| 11 | Aalpha Energy Inc. | | Oil & Gas Operator | May 2025 |
| 12 | Aba Energy Corporation | | Oil & Gas Operator | May 2025 |
| 13 | ABC Oil Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2023 |
| 14 | Abe Giesbrecht | | Gas Operator | Dec 1983 |
| 15 | Adco LTD. | | Oil & Gas Operator | Dec 1983 |
| 16 | Aera Energy LLC | | Oil & Gas Operator | May 2025 |
| 17 | Agey Petroleum Co. | | Oil & Gas Operator | Dec 1998 |
| 18 | Alanmar Energy | | Gas Operator | Jan 2018 |
| 19 | Alexander Oil Co. | Loco, OK 73442-9409 | Oil & Gas Operator | Jun 2025 |
| 20 | Allenco Energy Inc. | | Oil & Gas Operator | Apr 2025 |
| 21 | Allied Energy Corporation | | Oil & Gas Operator | Apr 2025 |
| 22 | Allied Western Petroleum | | Oil & Gas Operator | Apr 2025 |
| 23 | Almond Crest Oil LLC | | Oil & Gas Operator | Apr 2025 |
| 24 | Amerada Hess Corp. Unit Operator | | Oil & Gas Operator | Dec 1986 |
| 25 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 26 | American Barter Petroleum Inc. | | Oil & Gas Operator | Jun 1993 |
| 27 | Ample Resources Inc. | | Oil & Gas Operator | Apr 2025 |
| 28 | Amrich Energy Inc. | | Oil & Gas Operator | Apr 2025 |
| 29 | Anacapa Oil Corporation | | Gas Operator | Apr 2025 |
| 30 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 31 | Ancora-Verde Corporation | | Oil & Gas Operator | Dec 2004 |
| 32 | Andrew L. Newkirk | | Oil Operator | Apr 2025 |
| 33 | Angus Petroleum Corporation | Chicago, IL 60660 | Oil & Gas Operator | Dec 2022 |
| 34 | Ann Brindle | | Oil Operator | Apr 2025 |
| 35 | Ann Marie Tiers | | Oil Operator | Dec 1996 |
| 36 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 37 | Anterra Energy Services Inc. | | Oil & Gas Operator | Apr 2025 |
| 38 | Anterra Services Inc. | | Oil & Gas Operator | Apr 2025 |
| 39 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 40 | Apc Operating Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Oct 1996 |
| 41 | Arcady Oil Company | | Gas Operator | Dec 1989 |
| 42 | Archer Operations California LLC | | Gas Operator | Apr 2025 |
| 43 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 44 | Arco Western Energy Co. | | Oil & Gas Operator | Dec 1999 |
| 45 | Argo Petroleum Corporation | | Oil & Gas Operator | Dec 1989 |
| 46 | Argosy Oil Company | | Gas Operator | Dec 1999 |
| 47 | Aristata Exploration Co. | | Gas Operator | Dec 2009 |
| 48 | Arkoma Production Company Of California | | Oil & Gas Operator | Dec 1993 |
| 49 | Armca Oil & Gas LLC | | Oil Operator | May 2025 |
| 50 | Armstrong Oil Inc. | | Oil & Gas Operator | Dec 2020 |
| 51 | Armstrong Petroleum Corporation | | Oil & Gas Operator | Apr 2025 |
| 52 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Jul 2025 |
| 53 | Arthur J. Arding Jr. | | Gas Operator | Dec 1995 |
| 54 | Arthur McAdams | | Oil & Gas Operator | Apr 2025 |
| 55 | Ashe Road Properties L.P. | | Oil & Gas Operator | Dec 2009 |
| 56 | Asioco Inc. | | Oil & Gas Operator | Jan 2018 |
| 57 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 58 | Asphalta LLC | | Oil & Gas Operator | May 2025 |
| 59 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Apr 2025 |
| 60 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Jul 2025 |
| 61 | Atlantic Oil Company | | Oil & Gas Operator | Apr 2025 |
| 62 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 63 | Austin Oil Company | | Oil & Gas Operator | Dec 2000 |
| 64 | Axis Petroleum Co. | | Oil & Gas Operator | Dec 2022 |
| 65 | B & L Pump & Supply Company | | Oil & Gas Operator | Apr 2025 |
| 66 | B & S Oil Company | Kermit, TX 79745 | Oil & Gas Operator | May 2025 |
| 67 | B. D. & D. Co. | | Gas Operator | Dec 1992 |
| 68 | B. E. Conway Energy Inc. | | Oil & Gas Operator | Apr 2025 |
| 69 | B5 Holdings LLC | | Oil Operator | Jun 2025 |
| 70 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 71 | Baker Oil And Gas Company | | Gas Operator | Dec 1997 |
| 72 | Baker-Dickey Partnership | | Oil Operator | Dec 1992 |
| 73 | Bakersfield Energy Resources Inc. | | Oil & Gas Operator | Dec 1998 |
| 74 | Bali Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 75 | Ballard Oil Inc. | | Oil & Gas Operator | May 2025 |
| 76 | Barco Oil Co. | | Oil Operator | Dec 2009 |
| 77 | Barham-Boyne Oil Co. Inc. | | Oil Operator | Dec 1992 |
| 78 | Barto Oil Co. | | Oil & Gas Operator | Dec 1992 |
| 79 | Bayshore-Long Beach LLC | | Oil & Gas Operator | Dec 2000 |
| 80 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 81 | Beach Supply Co. | | Oil Operator | Dec 1987 |
| 82 | Beacon Oil Company | | Oil Operator | Dec 1985 |
| 83 | Bechtel Petroleum Operations Inc. | | Oil & Gas Operator | Dec 1997 |
| 84 | Bellaire Oil Company | | Oil & Gas Operator | May 2025 |
| 85 | Bellevue Resources Inc | Lakewood, CO 80235 | Oil & Gas Operator | Feb 2009 |
| 86 | Belridge Energy Resources Inc. | | Oil & Gas Operator | May 2025 |
| 87 | Bennett Petroleum Inc. | | Oil & Gas Operator | May 2025 |
| 88 | Bentley Family Limited Partnership | | Oil & Gas Operator | Feb 2023 |
| 89 | Benton Oil & Gas | | Gas Operator | Dec 1992 |
| 90 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Jun 2025 |
| 91 | Berkley Petroleum Inc. | | Oil & Gas Operator | Dec 2007 |
| 92 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 93 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | May 2025 |
| 94 | Beverly Hills Oil Co. | | Oil & Gas Operator | Dec 1979 |
| 95 | Big Horn Oil And Gas Inc. | | Gas Operator | Apr 2025 |
| 96 | Big Valley Resources | | Oil Operator | Dec 2008 |
| 97 | Big West Of California LLC | | Oil & Gas Operator | Dec 2018 |
| 98 | Black Badger Energy LLC. | | Oil Operator | May 2025 |
| 99 | Black Gold Oil Company | Duncan, OK 73533-1581 | Oil & Gas Operator | Apr 2025 |
| 100 | Black Mountain Oil Co. | | Oil & Gas Operator | Dec 1999 |