| 1 | C & C Productions LLC | Muskogeee, OK 74402 | Oil & Gas Operator | Jul 2025 |
| 2 | C & J Exploration LLC | Colorado Springs, CO 80920-3946 | Oil & Gas Operator | Oct 2022 |
| 3 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 4 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Jun 2025 |
| 5 | Cane Creek Energy Partners Inc | Morris, OK 74445 | Oil & Gas Operator | Jun 2025 |
| 6 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Jul 2025 |
| 7 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 8 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 9 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 10 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Jul 2025 |
| 11 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 12 | Castelli Exploration, Inc. | Oklahoma City, OK 73162 | Oil & Gas Operator | Jun 2025 |
| 13 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Oct 2025 |
| 14 | Cenpat Operating LLC | Houston, TX 77042-3044 | Oil & Gas Operator | Jun 2025 |
| 15 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |
| 16 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 17 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 18 | Cher Oil Company LTD | Ripley, OK 74062 | Oil & Gas Operator | Jun 2025 |
| 19 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 20 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 21 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 22 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jun 2025 |
| 23 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 24 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 25 | Claborn Julia | Okmulgee, OK 74447-9781 | Oil & Gas Operator | Mar 2022 |
| 26 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 27 | Clark Operating Services, Inc. | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 28 | Clear Creek Royalty LLC | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2023 |
| 29 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 30 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 31 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 32 | CM Exploration Company Inc. | | Oil & Gas Operator | Apr 2009 |
| 33 | CMT Oil & Gas Company Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Jun 2025 |
| 34 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 35 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 36 | Confederate Bay LLC | Okemah, OK 74859 | Oil & Gas Operator | Jun 2025 |
| 37 | Confederate Spooling Inc | Okemah, OK 74859-2409 | Oil & Gas Operator | Apr 2020 |
| 38 | Conner Production Co LLC | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 39 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 40 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 41 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 42 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 43 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | Apr 2025 |
| 44 | Crew B Operating, LLC | Okmulgee, OK 74447 | Oil Operator | Jun 2025 |
| 45 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 46 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jun 2025 |
| 47 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 48 | Culbreath Oil & Gas Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 49 | Cumberland Operating Company | Seminole, OK 74868-1258 | Oil & Gas Operator | Mar 2007 |
| 50 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Jun 2025 |
| 51 | Cyanostar Energy, Inc | Tulsa, OK 74103-4122 | Oil & Gas Operator | Sep 2001 |
| 52 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | Jun 2025 |