| 101 | Blackhawk Oil Co | Ottawa, KS 66067 | Oil & Gas Operator | Jan 2011 |
| 102 | Bloomfield Partners II LLC | | Oil & Gas Operator | Dec 2005 |
| 103 | Bob Crupper | | Oil Operator | Dec 1995 |
| 104 | Bob Ferguson Independent | | Oil & Gas Operator | Dec 2020 |
| 105 | Bobbie G. & Vallee J. Williams | | Oil & Gas Operator | Dec 1991 |
| 106 | Bonanza Creek Energy Operating Company LLC | | Oil & Gas Operator | Mar 2025 |
| 107 | Botto And Miller Trustees | | Oil & Gas Operator | Dec 1993 |
| 108 | Bradley Muhl And Associates | | Oil & Gas Operator | Dec 1993 |
| 109 | Brayton-Hodges Petroleum Inc. | | Oil & Gas Operator | Mar 2025 |
| 110 | Brea Canon Oil Co. | | Oil & Gas Operator | Mar 2025 |
| 111 | Brea Oil Company Inc. | | Oil & Gas Operator | Oct 2001 |
| 112 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 113 | Bridge Energy LLC | | Oil & Gas Operator | Mar 2025 |
| 114 | Bridge Point Carson LLC | | Oil & Gas Operator | Mar 2025 |
| 115 | Bridgeland Resources LLC | | Oil & Gas Operator | Mar 2025 |
| 116 | Bridgemark Corporation | | Oil & Gas Operator | Feb 2025 |
| 117 | Brindle/Thomas | | Oil & Gas Operator | Dec 2023 |
| 118 | Brittany Oil Co. | | Oil & Gas Operator | Dec 2022 |
| 119 | Brknco LLC | | Oil & Gas Operator | Dec 2025 |
| 120 | Brogdon--A&K Leases | | Oil & Gas Operator | Dec 2001 |
| 121 | Bruce A. Holmes | | Oil & Gas Operator | Dec 2022 |
| 122 | Bruce Anderson | | Oil Operator | Dec 1998 |
| 123 | Bud'S Oil Company Inc. | Sperry, OK 74073 | Oil & Gas Operator | Dec 2025 |
| 124 | Bunker Oil Corp. | | Oil & Gas Operator | Dec 1994 |
| 125 | C & C Minerals LTD | | Oil & Gas Operator | Dec 2019 |
| 126 | C & J Oil | | Oil & Gas Operator | Feb 2025 |
| 127 | C & M Oil Co. & Investments | | Oil & Gas Operator | Feb 2025 |
| 128 | C. C. Killingsworth Opr. | | Oil Operator | Dec 1999 |
| 129 | C. Case Company | | Oil & Gas Operator | Feb 2025 |
| 130 | C. E. Allen Co. Inc. | | Oil & Gas Operator | Mar 2025 |
| 131 | C. E. Braly | | Oil & Gas Operator | Dec 1991 |
| 132 | C. F. Sudduth | | Oil & Gas Operator | Dec 1988 |
| 133 | Caac 100 LLC | | Oil & Gas Operator | Feb 2025 |
| 134 | Caballero Operations LLC | | Oil & Gas Operator | Mar 2025 |
| 135 | Cal Continental Capital Inc. | | Oil Operator | Dec 2006 |
| 136 | Caleco LLC | | Oil & Gas Operator | Feb 2025 |
| 137 | California E.D.I. Inc. | | Oil & Gas Operator | Jan 2018 |
| 138 | California Hydrocarbons Corporation | | Gas Operator | Feb 2025 |
| 139 | California Oil Independents | | Oil & Gas Operator | Feb 2025 |
| 140 | California Petroleum Group Inc. | | Oil Operator | Feb 2025 |
| 141 | California Resources Elk Hills LLC | | Oil & Gas Operator | Mar 2025 |
| 142 | California Resources Long Beach Inc. | | Oil & Gas Operator | Mar 2025 |
| 143 | California Resources Production Corporation | | Oil & Gas Operator | Mar 2025 |
| 144 | California Southern Oil Co. | | Oil Operator | Dec 2000 |
| 145 | California/Nevada Developments LLC | | Oil Operator | Dec 2001 |
| 146 | Calnrg Operating LLC | | Oil & Gas Operator | Mar 2025 |
| 147 | Calresources LLC | | Oil & Gas Operator | Dec 1996 |
| 148 | Caltico Oil Corp. | | Oil Operator | Feb 2025 |
| 149 | Campbell Energy Corp. | | Oil & Gas Operator | May 1992 |
| 150 | Campo Verde Oil Inc. | | Oil Operator | Mar 2025 |
| 151 | Camtex Industries Inc. | | Oil Operator | Dec 1996 |
| 152 | Capco Resource Corporation | Orange,, CA 92869 | Oil Operator | Sep 2007 |
| 153 | Capital Production Company | | Oil Operator | Dec 1997 |
| 154 | Capitol Oil Corporation | | Oil & Gas Operator | Feb 2025 |
| 155 | Carbon California Operating Company LLC | | Oil & Gas Operator | Mar 2025 |
| 156 | Carl Weaver Properties | | Oil & Gas Operator | Dec 1987 |
| 157 | Carneros Energy Inc. | | Oil & Gas Operator | Dec 2004 |
| 158 | Carol Rhodabarger Heitz | | Oil & Gas Operator | Dec 1996 |
| 159 | Carson Dominguez Real Est Corp | | Oil & Gas Operator | Dec 1996 |
| 160 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | Mar 2025 |
| 161 | Case'S Used Equipment | | Oil & Gas Operator | Feb 2025 |
| 162 | Casex Company | | Oil & Gas Operator | Dec 2007 |
| 163 | Castle Minerals | | Oil & Gas Operator | Dec 2018 |
| 164 | Cat Canyon Resources LLC | | Oil & Gas Operator | Feb 2025 |
| 165 | Cather Rogers Barnes & Cree | | Oil & Gas Operator | Dec 2009 |
| 166 | Cather, Barnes & Cree | | Oil & Gas Operator | Dec 2009 |
| 167 | Cather-Herley Oil Company | | Oil & Gas Operator | Mar 2025 |
| 168 | Cbase Corporation | | Oil & Gas Operator | Mar 2025 |
| 169 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 170 | Cemco-Edison No. 1 (F.R.) Partnership | | Oil & Gas Operator | Dec 2000 |
| 171 | Cen Cal Drilling Inc. | | Oil & Gas Operator | Dec 1994 |
| 172 | Cenex Inc. | | Oil & Gas Operator | Dec 1994 |
| 173 | Central California Oil Co. | Fish Camp, CA 93623 | Oil & Gas Operator | Mar 2025 |
| 174 | Central Lease Inc. | | Oil & Gas Operator | Dec 1998 |
| 175 | Central Pacific Resources | | Oil Operator | Mar 2025 |
| 176 | Central Park Energy | | Oil & Gas Operator | Dec 1991 |
| 177 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 178 | Central Valley Gas Storage LLC | | Gas Operator | Mar 2025 |
| 179 | Century Exploration Resources LLC | | Oil & Gas Operator | Dec 2015 |
| 180 | Century Production Inc | | Oil & Gas Operator | Dec 1986 |
| 181 | CFT Oil & Gas LLC | | Oil Operator | Mar 2025 |
| 182 | Chaim Nathan & Edie Bato | | Oil & Gas Operator | Feb 2025 |
| 183 | Challenger Minerals Inc. | | Oil & Gas Operator | Dec 1991 |
| 184 | Chalmers-Santa Fe LLC | | Oil & Gas Operator | Dec 2007 |
| 185 | Chambers & Mouren | | Oil & Gas Operator | Mar 2025 |
| 186 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 187 | Channel Exploration Company | | Oil & Gas Operator | Feb 1997 |
| 188 | Chaparral Petroleum Inc. | | Oil Operator | Feb 2025 |
| 189 | Charles W. Hinesley | | Oil & Gas Operator | Dec 1991 |
| 190 | Chemassist L.L.C. | | Oil & Gas Operator | Mar 2025 |
| 191 | Chester F. Dolley | | Oil & Gas Operator | Dec 1986 |
| 192 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 193 | Citadel Exploration Inc. | | Oil Operator | Feb 2025 |
| 194 | City Of Hermosa Beach | | Oil & Gas Operator | Dec 2005 |
| 195 | City Of Huntington Beach (Fire Dept.) | | Oil & Gas Operator | Mar 2025 |
| 196 | City Of Newport Beach | | Oil & Gas Operator | Mar 2025 |
| 197 | City Of Santa Fe Springs | | Oil Operator | Dec 2007 |
| 198 | City Oil Corp. Oper. For | | Oil & Gas Operator | Dec 1989 |
| 199 | Claremont Energy | | Gas Operator | Dec 1993 |
| 200 | Clarence R. Barnett Inc. | | Oil & Gas Operator | Feb 2025 |