| 1 | C & B Energy Resources | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 2 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2024 |
| 3 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Jan 2024 |
| 4 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 5 | Calvert Operating LLC | | Oil Operator | Feb 2024 |
| 6 | Cane Creek Energy Partners Inc | Morris, OK 74445-2674 | Oil & Gas Operator | Jan 2024 |
| 7 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Apr 2024 |
| 8 | Cannuck Resources Inc | Nowata, OK 74048 | Oil & Gas Operator | Aug 2000 |
| 9 | Canok International Inc | Beggs, OK 74421-0038 | Oil & Gas Operator | Jan 2024 |
| 10 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 11 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742-0698 | Oil Operator | Dec 2019 |
| 12 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041-0040 | Oil & Gas Operator | Feb 2024 |
| 13 | Cartledge Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 14 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 15 | Casselman Leases LLC | Morris, OK 74445-2509 | Oil & Gas Operator | Dec 2023 |
| 16 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Jan 2024 |
| 17 | Central Ok Reclamation LLC | | Oil & Gas Operator | Jun 2014 |
| 18 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2024 |
| 19 | Century Petroleum | Nowata, OK 74048 | Oil & Gas Operator | Dec 2000 |
| 20 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Jan 2024 |
| 21 | Chambers & Hendrix Oil & Gas | Skiatook, OK 74070-0726 | Oil & Gas Operator | Aug 2022 |
| 22 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 23 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 24 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 25 | Cimarron Transmission Co | Ardmore, OK 73401 | Oil Operator | Jan 2024 |
| 26 | Circle K Oil & Gas Inc | Sand Springs, OK 74063-0276 | Oil & Gas Operator | Jan 2024 |
| 27 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 28 | Claborn Julia | Okmulgee, OK 74447-9781 | Oil & Gas Operator | Mar 2022 |
| 29 | Clark Well Service | Depew, OK 74028-0296 | Oil & Gas Operator | Aug 2013 |
| 30 | Cline Oil And Gas Company | Santa Fe, NM 87501 | Oil & Gas Operator | Sep 1994 |
| 31 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 32 | Coe Production Company | Talala, OK 74080-0264 | Oil & Gas Operator | Aug 2015 |
| 33 | Colorado Gas Compression Inc | Longmont, CO 80501-5868 | Oil & Gas Operator | Aug 2013 |
| 34 | Colpitt Brothers Oil | Collinsville, OK 74021-0028 | Oil & Gas Operator | Apr 2020 |
| 35 | Colpitt Brothers Operating Co | Collinsville, OK 74021-0028 | Oil & Gas Operator | Feb 2024 |
| 36 | Colpitt C H Drilling Co LLC | Collinsville, OK 74021-7107 | Oil Operator | Jan 2024 |
| 37 | Colpitt Chas H Drilling Co | Collinsville, OK 74021-7105 | Oil & Gas Operator | Mar 2012 |
| 38 | Condrin Oil 1985-A LTD | Tulsa, OK 74136 | Oil & Gas Operator | Nov 1998 |
| 39 | Conklin Robert L Dba Conklin Oil LLC | | Oil Operator | Jan 2024 |
| 40 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 41 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 42 | Continental Energy Operating LLC | | Oil & Gas Operator | Feb 2024 |
| 43 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Oct 2023 |
| 44 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 45 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 46 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 47 | Cornelius Petroleum Inc | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2024 |
| 48 | Corwin, B. V. | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 49 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 50 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 51 | Crasco Oil Company | Tulsa, OK 74120 | Oil Operator | Nov 1998 |
| 52 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2023 |
| 53 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 54 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 55 | Crude Marketing & Trans Inc | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2017 |
| 56 | Crude Resources | Sapulpa, OK 74066 | Oil & Gas Operator | Mar 2008 |
| 57 | Cummings Gene | | Oil Operator | Dec 2000 |
| 58 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Feb 2024 |
| 59 | Cummins Wren Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Nov 1998 |