| 1 | C & B Energy Resources | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 2 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 3 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 4 | Calvert Operating LLC | Oklahoma City, OK 73118 | Oil Operator | Feb 2026 |
| 5 | Cane Creek Energy Partners Inc | Morris, OK 74445 | Oil & Gas Operator | Jan 2026 |
| 6 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | May 2026 |
| 7 | Cannuck Resources Inc | Nowata, OK 74048 | Oil & Gas Operator | Aug 2000 |
| 8 | Canok International Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Jan 2026 |
| 9 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 10 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | Feb 2026 |
| 11 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | Feb 2026 |
| 12 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 13 | Casselman Leases LLC | Morris, OK 74445-2509 | Oil & Gas Operator | Nov 2025 |
| 14 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Feb 2026 |
| 15 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2026 |
| 16 | Century Petroleum | Nowata, OK 74048 | Oil & Gas Operator | Dec 2000 |
| 17 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Feb 2026 |
| 18 | Chambers & Hendrix Oil & Gas | Skiatook, OK 74070-0726 | Oil & Gas Operator | Aug 2022 |
| 19 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 20 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 21 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2026 |
| 22 | Circle K Oil & Gas Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Feb 2026 |
| 23 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | May 2026 |
| 24 | Claborn Julia | Okmulgee, OK 74447-9781 | Oil & Gas Operator | Mar 2022 |
| 25 | Clark Well Service | Depew, OK 74028-0296 | Oil & Gas Operator | Aug 2013 |
| 26 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 27 | Coe Production Company | Talala, OK 74080-0264 | Oil & Gas Operator | Aug 2015 |
| 28 | Colorado Gas Compression Inc | Longmont, CO 80501-5868 | Oil & Gas Operator | Aug 2013 |
| 29 | Colpitt Brothers Oil | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2020 |
| 30 | Colpitt Brothers Operating Co | Collinsville, OK 74021 | Oil & Gas Operator | Jan 2026 |
| 31 | Colpitt C H Drilling Co LLC | Collinsville, OK 74021-7107 | Oil Operator | Feb 2026 |
| 32 | Colpitt Chas H Drilling Co | Collinsville, OK 74021-7105 | Oil & Gas Operator | Mar 2012 |
| 33 | Condrin Oil 1985-A LTD | Tulsa, OK 74136 | Oil & Gas Operator | Nov 1998 |
| 34 | Conklin Robert L Dba Conklin Oil LLC | Tulsa, OK 74153 | Oil Operator | Feb 2026 |
| 35 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 36 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 37 | Continental Energy Operating LLC | Tulsa, OK 74114-1302 | Oil & Gas Operator | Feb 2026 |
| 38 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Feb 2026 |
| 39 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2026 |
| 40 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 41 | Cornelius Petroleum Inc | | Oil & Gas Operator | Jan 2026 |
| 42 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 43 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 44 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 45 | Crasco Oil Company | Tulsa, OK 74120 | Oil Operator | Nov 1998 |
| 46 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 47 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 48 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 49 | Crude Resources | Sapulpa, OK 74066 | Oil & Gas Operator | Mar 2008 |
| 50 | Cummings Gene | | Oil Operator | Dec 2000 |
| 51 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Feb 2026 |
| 52 | Cummins Wren Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Nov 1998 |