| 1 | 25 Hill Properties Inc. | | Oil Operator | Feb 2021 |
| 2 | 260 Resource Management LLC | | Gas Operator | Jan 2021 |
| 3 | 3MB Oil & Gas LLC | Irvine, CA 92616 | Oil & Gas Operator | Jan 2021 |
| 4 | 4H Oil Co. | | Oil Operator | Dec 1992 |
| 5 | A. J. Hayes | | Oil & Gas Operator | Dec 1998 |
| 6 | A. L. & V. I. Grayson | | Oil Operator | Dec 1993 |
| 7 | A. S. Johnston Drilling Corp. | | Oil & Gas Operator | Dec 1987 |
| 8 | A.L.S. Resources Inc. | | Oil Operator | Dec 2004 |
| 9 | Aa Production Services Inc. | | Gas Operator | Jan 2021 |
| 10 | Aalpha Energy Inc. | | Oil & Gas Operator | Jan 2021 |
| 11 | Aba Energy Corporation | | Oil & Gas Operator | Jan 2021 |
| 12 | ABC Oil Company Inc | Wichita Falls, TX 76301 | Oil & Gas Operator | Jan 2021 |
| 13 | Abe Giesbrecht | | Gas Operator | Dec 1983 |
| 14 | Adco LTD. | | Oil & Gas Operator | Dec 1983 |
| 15 | Aera Energy LLC | | Oil & Gas Operator | Feb 2021 |
| 16 | Agey Petroleum Co. | | Oil & Gas Operator | Dec 1998 |
| 17 | Alanmar Energy | | Gas Operator | Jan 2018 |
| 18 | Alexander Oil Company | Loco, OK 73442-9409 | Oil Operator | Jan 2021 |
| 19 | Allenco Energy Inc. | | Oil & Gas Operator | Feb 2021 |
| 20 | Allied Energy Corporation | | Oil & Gas Operator | Jan 2021 |
| 21 | Allied Western Petroleum | | Oil & Gas Operator | Jan 2021 |
| 22 | Alon Bakersfield Property Inc. | | Oil & Gas Operator | Feb 2021 |
| 23 | Amerada Hess Corp. Unit Operator | | Oil & Gas Operator | Dec 1986 |
| 24 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Feb 2016 |
| 25 | American Barter Petroleum Inc. | | Oil & Gas Operator | Jun 1993 |
| 26 | Ample Resources Inc. | | Oil & Gas Operator | Jan 2021 |
| 27 | Amrich Energy Inc. | | Oil & Gas Operator | Jan 2021 |
| 28 | Anacapa Oil Corporation | | Gas Operator | Jan 2021 |
| 29 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 30 | Ancora-Verde Corporation | | Oil & Gas Operator | Dec 2004 |
| 31 | Andrew L. Newkirk | | Oil Operator | Jan 2021 |
| 32 | Angus Petroleum Corporation | | Oil & Gas Operator | Jan 2021 |
| 33 | Ann Marie Tiers | | Oil Operator | Dec 1996 |
| 34 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 35 | Anterra Energy Services Inc. | | Oil & Gas Operator | Jan 2021 |
| 36 | Anterra Services Inc. | | Oil & Gas Operator | Jan 2021 |
| 37 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2021 |
| 38 | Apc Operating Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Oct 1996 |
| 39 | Arcady Oil Company | | Gas Operator | Dec 1989 |
| 40 | Archer Operations California LLC | | Gas Operator | Jan 2021 |
| 41 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 42 | Arco Western Energy Co. | | Oil & Gas Operator | Dec 1999 |
| 43 | Argo Petroleum Corporation | | Oil & Gas Operator | Dec 1989 |
| 44 | Argosy Oil Company | | Gas Operator | Dec 1999 |
| 45 | Aristata Exploration Co. | | Gas Operator | Dec 2009 |
| 46 | Arkoma Production Company Of California | | Oil & Gas Operator | Dec 1993 |
| 47 | Armstrong Oil Inc. | | Oil & Gas Operator | Dec 2020 |
| 48 | Armstrong Petroleum Corporation | | Oil & Gas Operator | Jan 2021 |
| 49 | Arthur J. Arding Jr. | | Gas Operator | Dec 1995 |
| 50 | Arthur McAdams | | Oil & Gas Operator | Jan 2021 |
| 51 | Ashe Road Properties L.P. | | Oil & Gas Operator | Dec 2009 |
| 52 | Asioco Inc. | | Oil & Gas Operator | Jan 2018 |
| 53 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 54 | Astarta Alexander Oil Co. LLC | | Oil & Gas Operator | Jan 2021 |
| 55 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Apr 2021 |
| 56 | Atlantic Oil Company | | Oil & Gas Operator | Jan 2021 |
| 57 | Atlantic Richfield Company | Plano, TX 75094-1744 | Oil & Gas Operator | Nov 2016 |
| 58 | Austin Oil Company | | Oil & Gas Operator | Dec 2000 |
| 59 | Axis Petroleum Co. | | Oil & Gas Operator | Feb 2021 |
| 60 | B & L Pump & Supply Company | | Oil & Gas Operator | Jan 2021 |
| 61 | B & S Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Nov 2020 |
| 62 | B. D. & D. Co. | | Gas Operator | Dec 1992 |
| 63 | B. E. Conway Energy Inc. | | Oil & Gas Operator | Feb 2021 |
| 64 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Jul 2014 |
| 65 | Baker Oil And Gas Company | | Gas Operator | Dec 1997 |
| 66 | Baker-Dickey Partnership | | Oil Operator | Dec 1992 |
| 67 | Bakersfield Energy Resources Inc. | | Oil & Gas Operator | Dec 1998 |
| 68 | Bali Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 69 | Ballard Oil Inc. | | Oil & Gas Operator | Jan 2021 |
| 70 | Barco Oil Co. | | Oil Operator | Dec 2009 |
| 71 | Barham-Boyne Oil Co. Inc. | | Oil Operator | Dec 1992 |
| 72 | Barto Oil Co. | | Oil & Gas Operator | Dec 1992 |
| 73 | Bayshore-Long Beach LLC | | Oil & Gas Operator | Dec 2000 |
| 74 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 75 | Beach Supply Co. | | Oil Operator | Dec 1987 |
| 76 | Beacon Oil Company | | Oil Operator | Dec 1985 |
| 77 | Bechtel Petroleum Operations Inc. | | Oil & Gas Operator | Dec 1997 |
| 78 | Bellaire Oil Co | Greenwood VIllage, CO 80111 3334 | Oil & Gas Operator | Feb 2021 |
| 79 | Bellevue Resources Inc | | Oil & Gas Operator | Feb 2009 |
| 80 | Belridge Energy Resources Inc. | | Oil & Gas Operator | Jan 2021 |
| 81 | Bennett Petroleum Inc. | | Oil & Gas Operator | Jan 2021 |
| 82 | Bentley Family Limited Partnership | | Oil & Gas Operator | Jan 2021 |
| 83 | Benton Oil & Gas | | Gas Operator | Dec 1992 |
| 84 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Feb 2021 |
| 85 | Berkley Petroleum Inc. | | Oil & Gas Operator | Dec 2007 |
| 86 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 87 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Jan 2021 |
| 88 | Beverly Hills Oil Co. | | Oil & Gas Operator | Dec 1979 |
| 89 | Big Horn Oil And Gas Inc. | | Gas Operator | Jan 2021 |
| 90 | Big Valley Resources | | Oil Operator | Dec 2008 |
| 91 | Big West Of California LLC | | Oil & Gas Operator | Dec 2018 |
| 92 | Binion Exploration & Development | | Oil Operator | Jan 2021 |
| 93 | Black Gold Oil Co Inc | Duncan, OK 73533-1191 | Oil & Gas Operator | Feb 2021 |
| 94 | Black Mountain Oil Co. | | Oil & Gas Operator | Dec 1999 |
| 95 | Black Velvet Petro. Co. | | Oil & Gas Operator | Dec 2007 |
| 96 | Blackhawk Oil Company | Ottawa, KS 66067 | Oil & Gas Operator | Nov 2007 |
| 97 | Blackstone Oil & Gas LLC | | Oil & Gas Operator | Jan 2021 |
| 98 | Bloomfield Partners II LLC | | Oil & Gas Operator | Dec 2005 |
| 99 | Bob Crupper | | Oil Operator | Dec 1995 |
| 100 | Bob Ferguson Independent | | Oil & Gas Operator | Dec 2020 |