| 1 | C & C Tank Service LLC | | Oil & Gas Operator | Sep 2022 |
| 2 | C & C Tank Truck Service Inc | Holdenville, OK 74848 | Oil Operator | Feb 2012 |
| 3 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Nov 2025 |
| 4 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 5 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 6 | C D Operating Company Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 7 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | Nov 2025 |
| 8 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 9 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 10 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 11 | Caddo-Marchand LC | Dallas, TX 75251-2202 | Oil & Gas Operator | Oct 2016 |
| 12 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | Oct 2025 |
| 13 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 14 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 15 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 16 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Nov 2025 |
| 17 | Carbon Ridge Energy LLC | Norman, OK 73069 | Oil & Gas Operator | Oct 2025 |
| 18 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 19 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2025 |
| 20 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 21 | Cement Oil Company | Cement, OK 73017-9234 | Oil & Gas Operator | Oct 2025 |
| 22 | Cemoil Inc | Cement, OK 73017-0563 | Oil & Gas Operator | Oct 2025 |
| 23 | CFC Oil Inc | Cyril, OK 73029-5601 | Oil & Gas Operator | Oct 2025 |
| 24 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Nov 2025 |
| 25 | Chambers Jerry Expl Co | | Oil & Gas Operator | Sep 2000 |
| 26 | Champion Reserves-Cri Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jun 1994 |
| 27 | Chaney & Cogburn Roustabout Well Serv | Cement, OK 73017-0267 | Oil & Gas Operator | Mar 2015 |
| 28 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 29 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 30 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 31 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 32 | Chisholm Trail Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 33 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Oct 2025 |
| 34 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 35 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 36 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Oct 2025 |
| 37 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 38 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 39 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 40 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 41 | Claiborne-McDonald Inc | Chickasha, OK 73018 | Oil Operator | Jul 2007 |
| 42 | Clydesdale Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2019 |
| 43 | Cmint Productions LLC | Dallas, TX 75248-2643 | Oil Operator | Oct 2021 |
| 44 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 45 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 46 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 47 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 48 | Cogburn Oil Co Inc | | Oil & Gas Operator | Oct 2025 |
| 49 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 50 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 51 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Nov 2025 |
| 52 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2025 |
| 53 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 54 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 55 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 56 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 57 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Dec 2025 |
| 58 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 59 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2025 |
| 60 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 61 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 62 | Corterra Energy Operating LLC | Tulsa, OK 74119-4844 | Oil & Gas Operator | Aug 2021 |
| 63 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 64 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Nov 2025 |
| 65 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 66 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 67 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 68 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 69 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 70 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 71 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Oct 2025 |