| 1 | C & D Drilling Company | Hennepin, OK 73046 | Oil & Gas Operator | Mar 2007 |
| 2 | C & R Petroleum Company | Duncan, OK 73533-1341 | Oil & Gas Operator | Dec 2025 |
| 3 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Feb 2026 |
| 4 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | Feb 2026 |
| 5 | Cain Randy A | Duncan, OK 73533 | Oil & Gas Operator | Jan 2026 |
| 6 | Cain Richard | Comanche, OK 73529-1248 | Oil & Gas Operator | May 2020 |
| 7 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 8 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 9 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 10 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Feb 2026 |
| 11 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 12 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 13 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 14 | Carter County Salt Water Disposal Inc | Wilson, OK 73463 | Oil Operator | Nov 2025 |
| 15 | Carter Preston Drilling Co | Davis, OK 73030 | Gas Operator | Nov 2000 |
| 16 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Jan 2026 |
| 17 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Feb 2026 |
| 18 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 19 | Cathey Production Company | Ryan, OK 73565-0485 | Oil Operator | Dec 2010 |
| 20 | Caulkins Oil Company | Aztec, NM 87410 | Oil & Gas Operator | Oct 2024 |
| 21 | Cement Oil Company | Cement, OK 73017-9234 | Oil & Gas Operator | Dec 2025 |
| 22 | Central Oklahoma Disposal Company | Kingston, OK 73439 | Oil Operator | Jan 2026 |
| 23 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2026 |
| 24 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jan 2026 |
| 25 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2026 |
| 26 | Chatham John | Wilson, OK 73463-9575 | Oil Operator | Feb 2014 |
| 27 | Chatham Verdell | Ratliff City, OK 73081-0061 | Oil Operator | Oct 2009 |
| 28 | Chatham VIckie R | Wilson, OK 73463 | Oil Operator | Jan 2026 |
| 29 | Chatham, Maxine | | Oil Operator | Oct 2016 |
| 30 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 31 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2026 |
| 32 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 33 | Chica Oil Company | Lago VIsta, TX 78645-6561 | Oil & Gas Operator | Mar 2001 |
| 34 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Apr 2026 |
| 35 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 36 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Apr 2026 |
| 37 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Jan 2026 |
| 38 | Clark And Clark | Princeton, NJ 08540-1930 | Oil & Gas Operator | Jul 2013 |
| 39 | Cobalt Environmental Solutions LLC | Oklahoma City, OK 73101-0249 | Oil Operator | Jun 2019 |
| 40 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 41 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 42 | Command Energy Operating LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2026 |
| 43 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 44 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 45 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 46 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 47 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2026 |
| 48 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |
| 49 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 50 | Coronado Energy Partners LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2026 |
| 51 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 52 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 53 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 54 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Feb 2026 |
| 55 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 56 | Cox Oil & Gas Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 57 | CPRP Services LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Feb 2026 |
| 58 | CRD Investments LLC | Duncan, OK 73533-4226 | Oil Operator | Dec 2025 |
| 59 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 60 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 61 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 62 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 63 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |