| 201 | Charing Cross Properties | | Oil Operator | Aug 1995 |
| 202 | Charles A. O'Niell, Jr. | | Oil & Gas Operator | Apr 2001 |
| 203 | Charles B. Bice | | Oil & Gas Operator | Jul 1983 |
| 204 | Charles E. Mayfield | | Oil & Gas Operator | Mar 2001 |
| 205 | Charles F. Word & Associates | | Oil Operator | Dec 1978 |
| 206 | Charles G. Dannelly | | Oil & Gas Operator | Mar 1998 |
| 207 | Charles Holston, Inc. | | Oil Operator | Jan 2024 |
| 208 | Charles Holston, Inc. Dba GTTS | | Oil Operator | Apr 2009 |
| 209 | Charles M. Nolan | | Oil Operator | Aug 1984 |
| 210 | Charleston Oil & Gas, Inc. | | Oil & Gas Operator | Mar 1997 |
| 211 | Chateau Oil And Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2017 |
| 212 | Cheniere Petroleum Corporation | | Oil & Gas Operator | Feb 1989 |
| 213 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2023 |
| 214 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 215 | Chester Floyd | | Oil Operator | Feb 1996 |
| 216 | Chestnut Exploration And Production, Inc | Richardson, TX 78081 | Oil & Gas Operator | Nov 2020 |
| 217 | Chestnut Petroleum, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Nov 2011 |
| 218 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 219 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 220 | Chiles Oil Field Supply | | Oil & Gas Operator | Jan 2024 |
| 221 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 222 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Apr 2024 |
| 223 | Cholla Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 1997 |
| 224 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 225 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 226 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 227 | Churchill Energy Inc | | Oil & Gas Operator | Sep 2020 |
| 228 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Apr 2024 |
| 229 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 230 | Ciera Resources, Inc. | | Gas Operator | Nov 1998 |
| 231 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 232 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 233 | Cimic Energy, LLC | | Oil Operator | Jan 2024 |
| 234 | Cinder Production Company | | Oil & Gas Operator | Apr 2014 |
| 235 | Cisco Petroleum, Inc. | | Oil & Gas Operator | Oct 2010 |
| 236 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 237 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 238 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 239 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 240 | Cits BK & Trust Of Springhill | | Oil & Gas Operator | Jun 1990 |
| 241 | Civego, Inc. | | Oil & Gas Operator | Jul 1994 |
| 242 | Clarence F. Routon, Jr. | | Oil Operator | Apr 1990 |
| 243 | Clark Oil Producing Company | | Oil & Gas Operator | Oct 1979 |
| 244 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Apr 2024 |
| 245 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 246 | Claude Debeaux, Jr. Et Al | | Oil Operator | Dec 1999 |
| 247 | Claude S. Hinds | | Oil Operator | Aug 1985 |
| 248 | Clayton W. Williams, Jr. | | Oil & Gas Operator | Sep 1986 |
| 249 | Clayton W. Williams, Jr., Inc. | | Oil & Gas Operator | May 1993 |
| 250 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 251 | Clear Lake Oil Co. | | Oil Operator | Jan 2024 |
| 252 | Clearly Petroleum, LLC | Houston, TX 77086 | Oil & Gas Operator | Jun 2020 |
| 253 | Clements Energy, Inc. | | Oil & Gas Operator | Oct 1987 |
| 254 | Clements-B & MCK - Luffey | | Gas Operator | Apr 1979 |
| 255 | Click Corp | Monroe, LA 71207 | Oil & Gas Operator | Jan 2004 |
| 256 | Cliffs Drilling Company | | Oil & Gas Operator | Dec 1984 |
| 257 | Cliffs Oil And Gas Company | | Oil & Gas Operator | Oct 1997 |
| 258 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 259 | CLK Energy Partners, LLC | | Oil & Gas Operator | Aug 2018 |
| 260 | Clovelly DRLG & Dev Co Inc | | Oil & Gas Operator | Oct 1983 |
| 261 | Clovelly Oil Co. LLC | | Oil & Gas Operator | Nov 2023 |
| 262 | Clovelly Oil Co., Inc. | | Oil & Gas Operator | Nov 2008 |
| 263 | Clovelly Oil Co., Inc. - Ripco | | Oil & Gas Operator | Nov 1991 |
| 264 | Clover Energy Corp | | Oil & Gas Operator | May 1980 |
| 265 | CM Oil Co., L.L.C. | | Oil Operator | Jan 2024 |
| 266 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 267 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 268 | CN Operating Company | Drumright, OK 74030 | Oil & Gas Operator | Nov 1998 |
| 269 | CNC Oil Co., Inc. | | Oil Operator | Aug 1991 |
| 270 | CNG Producing Co.-Tulsa Div. | | Oil & Gas Operator | Jun 1986 |
| 271 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 272 | Co-Wil-Co, Incorporated | | Oil Operator | Dec 1990 |
| 273 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 274 | Coast Exploration Co. | | Oil & Gas Operator | Nov 1997 |
| 275 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 276 | Coastal Minerals, Inc. | | Oil Operator | Aug 1991 |
| 277 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 278 | Coastal Plains Exploration, LLC | Port Lavaca, TX 77979 | Oil & Gas Operator | Apr 2024 |
| 279 | Coastal Production Inc. | | Oil & Gas Operator | Aug 2000 |
| 280 | Coastal States & Emerald Oil | | Oil & Gas Operator | Dec 1979 |
| 281 | Coastal States Gas Prod. Co. | | Oil & Gas Operator | Jun 1996 |
| 282 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 283 | Cochon Properties, LLC | | Oil & Gas Operator | Aug 2016 |
| 284 | Cockrell Oil Corporation | Houston, TX 77002-7348 | Oil & Gas Operator | Feb 2001 |
| 285 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 286 | Cody C. Beasley | | Oil & Gas Operator | Apr 1987 |
| 287 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 288 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Feb 2024 |
| 289 | Cohen & Kosovitz | | Oil & Gas Operator | May 1998 |
| 290 | Coho Louisiana Production Co | | Gas Operator | Jan 1999 |
| 291 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 292 | Colgrade Investment Corp. | | Oil Operator | Apr 2004 |
| 293 | Collet Oil Ventures, Inc. | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 294 | Colorado Oil Co., Inc. | | Oil & Gas Operator | Dec 1977 |
| 295 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | Dec 2023 |
| 296 | Colt Production Corp. Inc. | | Oil & Gas Operator | Jul 1996 |
| 297 | Columbia Gas Dev. Corp. | | Oil & Gas Operator | Apr 1996 |
| 298 | Columbia Gulf Transmission Co. | | Oil Operator | Dec 2014 |
| 299 | Columbia Gulf Transmission Company, LLC | | Oil Operator | Dec 2023 |
| 300 | Columbia Minerals Corp., Inc. | | Oil & Gas Operator | May 1996 |