| 201 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Aug 2025 |
| 202 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 203 | Chambers & Hendrix Oil & Gas | Skiatook, OK 74070-0726 | Oil & Gas Operator | Aug 2022 |
| 204 | Chambers Jerry Expl Co | | Oil & Gas Operator | Sep 2000 |
| 205 | Champ Oil Co, Inc | Hickory Creek, TX 75065 | Oil & Gas Operator | Dec 2020 |
| 206 | Champion Reserves-Cri Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jun 1994 |
| 207 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jul 2025 |
| 208 | Chance Oil Co., Inc. | Vernon, TX 76385 | Oil & Gas Operator | Jun 2025 |
| 209 | Chaney & Cogburn Roustabout Well Serv | Cement, OK 73017-0267 | Oil & Gas Operator | Mar 2015 |
| 210 | Chanse Energy Corporation | Shreveport, LA 71165-1572 | Oil & Gas Operator | Sep 2021 |
| 211 | Chanse Petroleum Corporation | New York, NY 10165-1134 | Oil & Gas Operator | Feb 2015 |
| 212 | Chanze Oil Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 213 | Chapel Operating LLC | Lone Grove, OK 73443 | Oil Operator | Jun 2025 |
| 214 | Chapman Elise P Estate | | Oil & Gas Operator | Mar 2020 |
| 215 | Chapman Energy Oklahoma, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 216 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 217 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 218 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 219 | Chapman Resources Corporation | Dallas, TX 75231 | Oil & Gas Operator | May 1999 |
| 220 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Oct 2025 |
| 221 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 2025 |
| 222 | Charter Services LLC | Cushing, OK 74023 | Oil Operator | Jul 2025 |
| 223 | Chastain Diane | Coffeyville, KS 67337-9620 | Oil & Gas Operator | Feb 2015 |
| 224 | Chastain Land & Energy LLC | Wetumka, OK 74883-0067 | Oil & Gas Operator | Sep 2017 |
| 225 | Chatham John | Wilson, OK 73463-9575 | Oil Operator | Feb 2014 |
| 226 | Chatham Verdell | Ratliff City, OK 73081-0061 | Oil Operator | Oct 2009 |
| 227 | Chatham VIckie R | Wilson, OK 73463 | Oil Operator | Jun 2025 |
| 228 | Chatham, Maxine | | Oil Operator | Oct 2016 |
| 229 | Chen K Wendell | Arlington, TX 76016-2555 | Oil & Gas Operator | Mar 2015 |
| 230 | Chenhall Billy J | Haskell, OK 74436-8733 | Oil & Gas Operator | Sep 2015 |
| 231 | Cher Oil Company LTD | Ripley, OK 74062 | Oil & Gas Operator | Jun 2025 |
| 232 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 233 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 234 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | May 2025 |
| 235 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 236 | Chesapeake Exploration LLC | Oklahoma City, OK 731540496 | Oil & Gas Operator | Jul 2020 |
| 237 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 238 | Chesapeake Permian LP | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Feb 2015 |
| 239 | Chester Oil Company | Wetumka, OK 74883-6227 | Oil & Gas Operator | Jun 2025 |
| 240 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 241 | Chew-Coast & Sons | Bartlesville, OK 74006-0407 | Gas Operator | Dec 2012 |
| 242 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 2025 |
| 243 | Chica Oil Company | Lago VIsta, TX 78645-6561 | Oil & Gas Operator | Mar 2001 |
| 244 | Chief Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 1995 |
| 245 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | Jul 2025 |
| 246 | Chiles Jack Well Service | Atwood, OK 74827-0373 | Oil Operator | Apr 2014 |
| 247 | Chiles Robert Morris | Allen, OK 74825 | Oil Operator | Jun 2025 |
| 248 | Chinn, Larry A | | Oil & Gas Operator | Jun 2025 |
| 249 | Chinn, Larry E | | Oil & Gas Operator | Jun 2025 |
| 250 | Chinn, Velma D | | Oil Operator | Mar 2015 |
| 251 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | Jul 2025 |
| 252 | Chisholm Operating LLC | Oklahoma City, OK 73101-1502 | Oil & Gas Operator | Dec 2017 |
| 253 | Chisholm Trail Resources, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 254 | Chisos Exploration Inc | Enid, OK 73703 | Oil & Gas Operator | Dec 2004 |
| 255 | Chisum G H | Duncan, OK 73533 | Oil & Gas Operator | Dec 2010 |
| 256 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Jun 2025 |
| 257 | Choate Kenny Dba Rebound Oil Co | Helena, OK 73741-0543 | Gas Operator | Jul 2025 |
| 258 | Chockley Energy LLC | Beaver, OK 73932 | Gas Operator | Jun 2025 |
| 259 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Jun 2025 |
| 260 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 261 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Jun 2025 |
| 262 | Chris Oil Co | Cambridge, OH 43725 | Oil & Gas Operator | Nov 2008 |
| 263 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 264 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 265 | Christian Bros Op Co Inc | Ada, OK 74820 | Oil & Gas Operator | Apr 2014 |
| 266 | Christie Jr C B | Wichita Falls, TX 76308-4873 | Oil & Gas Operator | May 2024 |
| 267 | Cibola Energy Corporation | Albuquerque, NM 87103 | Oil & Gas Operator | Oct 2017 |
| 268 | Cicada Crude LLC | Sapulpa, OK 74066 | Oil Operator | Jun 2025 |
| 269 | Cig Exploration Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 1999 |
| 270 | Cig Resources Company | Colorado Spring, CO 80944-1087 | Oil & Gas Operator | Jun 2018 |
| 271 | Cigna Energy Resources Inc | Englewood, CO 80155-5038 | Oil Operator | Nov 1998 |
| 272 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 273 | Cimarron Management Corp | | Oil & Gas Operator | Jul 2020 |
| 274 | Cimarron Oil & Gas Inc | Perry, OK 73077-1318 | Oil & Gas Operator | Sep 2000 |
| 275 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 276 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Jun 2025 |
| 277 | Cimarron Production Co Inc | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Jun 2025 |
| 278 | Cimarron River Operating Co | Mannford, OK 74044 | Oil & Gas Operator | Jun 2025 |
| 279 | Cimarron Valley Energy Inc | Stillwater, OK 74076 | Oil Operator | Apr 2015 |
| 280 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jun 2025 |
| 281 | Circle C Oilfield Supply Inc | Wetumka, OK 74883-0068 | Oil & Gas Operator | Apr 2017 |
| 282 | Circle K Oil & Gas Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Jun 2025 |
| 283 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 284 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Jun 2025 |
| 285 | Citadel Production Company, Inc. | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 286 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 287 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 288 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 289 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2025 |
| 290 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 291 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 292 | Civic Energy Corporation | Colony, OK 73021 | Oil & Gas Operator | Jun 2025 |
| 293 | CJR Operating LLC | Wister, OK 74966 | Gas Operator | Jun 2025 |
| 294 | CK Resources | Cleveland, OK 74020-0772 | Oil Operator | Aug 2013 |
| 295 | Claassen Oil And Gas, Inc. | Estes Park, CO 80517 | Oil & Gas Operator | Jun 2025 |
| 296 | Claborn Julia | Okmulgee, OK 74447-9781 | Oil & Gas Operator | Mar 2022 |
| 297 | Claiborne-McDonald Inc | Chickasha, OK 73018 | Oil Operator | Jul 2007 |
| 298 | Clapp Carl O | Cedar Vale, KS 67024 | Oil Operator | Aug 2013 |
| 299 | Claremont Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2017 |
| 300 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |