| 1 | C & A Oil Company | Edmond, OK 73013-9413 | Oil & Gas Operator | Mar 2015 |
| 2 | C & B Energy Resources | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 3 | C & B Production | Ben Bolt, TX 78342 | Oil & Gas Operator | Dec 2025 |
| 4 | C & C Oil Co. | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 5 | C & C Productions LLC | Muskogeee, OK 74402 | Oil & Gas Operator | Oct 2025 |
| 6 | C & C Tank Service LLC | | Oil & Gas Operator | Sep 2022 |
| 7 | C & C Tank Truck Service Inc | Holdenville, OK 74848 | Oil Operator | Feb 2012 |
| 8 | C & D Drilling Company | Hennepin, OK 73046 | Oil & Gas Operator | Mar 2007 |
| 9 | C & D Supply | Cherokee, OK 73728-5817 | Oil & Gas Operator | Oct 2025 |
| 10 | C & D Supply LLC | Cherokee, OK 73728-5817 | Oil & Gas Operator | Nov 2025 |
| 11 | C & G Energy Inc | | Oil & Gas Operator | Jun 1996 |
| 12 | C & H Oil Company | Ratliff City, OK 73481-0130 | Oil & Gas Operator | Apr 2015 |
| 13 | C & J Exploration LLC | Colorado Springs, CO 80920-3946 | Oil & Gas Operator | Oct 2022 |
| 14 | C & J Trucks LLC | Seminole, OK 74868-5406 | Oil & Gas Operator | Dec 2025 |
| 15 | C & L Drilling Company | Ada, OK 74821-1252 | Oil & Gas Operator | Jan 2014 |
| 16 | C & L Enterprise Of Wagoner | Coweta, OK 74429-9657 | Oil Operator | Mar 2001 |
| 17 | C & L Enterprises Inc | Lindsay, OK 73052 | Oil & Gas Operator | Oct 2025 |
| 18 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Nov 2025 |
| 19 | C & L Oil Company | Cross Plains, TX 76443 | Oil & Gas Operator | Dec 2025 |
| 20 | C & M Exploration LLC | Tulsa, OK 74159-1331 | Oil & Gas Operator | Jun 2014 |
| 21 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 22 | C & R Petroleum Company | Duncan, OK 73533-1341 | Oil & Gas Operator | Oct 2025 |
| 23 | C & S Oil Company | Odessa, TX 79763 | Oil & Gas Operator | Nov 2019 |
| 24 | C & S Petroleum, Inc. | Norman, OK 73070 | Oil & Gas Operator | Dec 2024 |
| 25 | C & T Energy Co | Bartlesville, OK 74006 | Oil & Gas Operator | Nov 2004 |
| 26 | C & T Energy LLC | Morris, OK 74445-2667 | Oil & Gas Operator | Oct 2025 |
| 27 | C & W Oil Inc | | Oil & Gas Operator | Aug 2016 |
| 28 | C & W Operating LLC | Tulsa, OK 74145-7627 | Oil Operator | May 2020 |
| 29 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 30 | C Bar K Enterprises Inc | Oklahoma City, OK 73154-1828 | Oil & Gas Operator | Dec 2022 |
| 31 | C D Operating Company Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 32 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 33 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | Nov 2025 |
| 34 | C E L Inc | Bartlesville, OK 74006 | Oil & Gas Operator | Jan 2020 |
| 35 | C F & L Producing Co | | Oil & Gas Operator | Sep 2000 |
| 36 | C H E Company Inc | Shawnee, OK 74801 | Oil Operator | Feb 2012 |
| 37 | C L & S Oil Company Inc | Perry, OK 73077-0841 | Oil & Gas Operator | Jan 2018 |
| 38 | C L Conner | Humble, TX 77338 | Oil & Gas Operator | Oct 2025 |
| 39 | C N Operating Co | Drumright, OK 74030 | Oil & Gas Operator | Nov 1998 |
| 40 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Oct 2025 |
| 41 | C-Water Disposal Inc | Oklahoma City, OK 73116-7326 | Oil Operator | Dec 2014 |
| 42 | C.J. Oil Company | Iowa Park, TX 76367 | Oil Operator | Jan 2025 |
| 43 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 44 | Cabco Energy Corporation | Hoffman, OK 74437 | Oil & Gas Operator | Dec 2018 |
| 45 | Cable W S | Cleveland, OK 74020 | Oil Operator | Jan 2021 |
| 46 | Cabot Exploration Corp | Houston, TX 77070 | Oil Operator | Jun 1999 |
| 47 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 48 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 49 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 50 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 51 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 52 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 53 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 54 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 55 | Caddo-Marchand LC | Dallas, TX 75251-2202 | Oil & Gas Operator | Oct 2016 |
| 56 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 57 | Cain Randy A | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 58 | Cain Richard | Comanche, OK 73529-1248 | Oil & Gas Operator | May 2020 |
| 59 | Cajeza Energy | Drumright, OK 74030 | Oil & Gas Operator | May 2013 |
| 60 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 61 | Calcuta Petroleum LLC | Edmond, OK 73013 | Oil Operator | Oct 2025 |
| 62 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 63 | Calebs Resources LLC | Edmond, OK 73012 | Oil & Gas Operator | Oct 2025 |
| 64 | Calgary Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Oct 2025 |
| 65 | Call Harold Charles | Dewey, OK 74029 | Oil Operator | Oct 2025 |
| 66 | Call, Harold L | | Oil Operator | Mar 2015 |
| 67 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | Oct 2025 |
| 68 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 69 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 70 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 71 | Calvert Drilling Co. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1992 |
| 72 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 73 | Calvert Operating LLC | Oklahoma City, OK 73118 | Oil Operator | Sep 2025 |
| 74 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Oct 2025 |
| 75 | Calyx Energy LLC | Tulsa, OK 74146-3807 | Oil & Gas Operator | Feb 2020 |
| 76 | Camaco Oil & Gas Co Inc | | Oil Operator | Oct 2025 |
| 77 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 78 | Camo Oil LLC | Stillwater, OK 74074 | Oil & Gas Operator | Nov 2025 |
| 79 | Camp Dennis | Ratliff City, OK 73081 | Oil & Gas Operator | Nov 2018 |
| 80 | Campbell B R | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2002 |
| 81 | Campbell Don G | Konawa, OK 74849 | Oil Operator | Feb 1997 |
| 82 | Campbell Production Company | Tulsa, OK 74137-4145 | Oil & Gas Operator | Mar 2015 |
| 83 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 84 | Canaan Exploration Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jan 1998 |
| 85 | Canaan Petroleum Inc | San Antonio, TX 78230-4042 | Oil & Gas Operator | Oct 2025 |
| 86 | Canaan Resources LLC | Oklahoma City, OK 73118-1126 | Gas Operator | Oct 2023 |
| 87 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 88 | Canard Colvert Operating LLC | Dallas, TX 75231 | Oil & Gas Operator | Oct 2025 |
| 89 | Candy Oil Production | Sand Springs, OK 74063-3410 | Oil Operator | Feb 2017 |
| 90 | Cane Creek Energy Partners Inc | Morris, OK 74445 | Oil & Gas Operator | Oct 2025 |
| 91 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Dec 2025 |
| 92 | Cannuck Resources Inc | Nowata, OK 74048 | Oil & Gas Operator | Aug 2000 |
| 93 | Canok International Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2025 |
| 94 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Nov 2025 |
| 95 | Cantrell Robert R | Ada, OK 74820 | Oil & Gas Operator | Oct 2025 |
| 96 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 97 | Canyon Creek Energy Arkoma LLC | Tulsa, OK 74120-3017 | Oil & Gas Operator | Oct 2025 |
| 98 | Canyon Creek Energy Operating LLC | Tulsa, OK 74120 | Oil & Gas Operator | Nov 2025 |
| 99 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 100 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |