| 201 | Chaparral Exploration, Inc. | | Oil & Gas Operator | Jun 2000 |
| 202 | Chaparral Operating, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Mar 2025 |
| 203 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 204 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 205 | Chiles Oil Field Supply | | Oil & Gas Operator | Jan 2025 |
| 206 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 207 | Cimic Energy, LLC | | Oil Operator | Jan 2025 |
| 208 | Cinder Production Company | | Oil & Gas Operator | Apr 2014 |
| 209 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 210 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 211 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 212 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 213 | Claude Debeaux, Jr. Et Al | | Oil Operator | Dec 1999 |
| 214 | Clear Lake Oil Co. | | Oil Operator | Jan 2025 |
| 215 | Clements Energy, Inc. | | Oil & Gas Operator | Oct 1987 |
| 216 | CM Oil Co., L.L.C. | | Oil Operator | Jan 2025 |
| 217 | CN Operating Company | Drumright, OK 74030 | Oil & Gas Operator | Nov 1998 |
| 218 | Cohen & Kosovitz | | Oil & Gas Operator | May 1998 |
| 219 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 220 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 221 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 222 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 223 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 224 | Conquest Petroleum Inc | | Oil & Gas Operator | Nov 2014 |
| 225 | Consolidated Energy Inv., Inc. | | Oil & Gas Operator | Oct 2013 |
| 226 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 227 | Cook Production LLC | | Oil Operator | Jan 2025 |
| 228 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 229 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 230 | Courtney Oil Co. | | Oil Operator | Dec 1998 |
| 231 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 232 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 233 | Coy W. Hale | | Oil Operator | Nov 2024 |
| 234 | Cpi 5, L.L.C | | Oil Operator | Dec 2023 |
| 235 | Cpi Operating Co. | | Oil & Gas Operator | Mar 2003 |
| 236 | Cpi Operating Company, LLC | | Oil Operator | Jan 2025 |
| 237 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2025 |
| 238 | Creslenn Oil Company | | Oil & Gas Operator | Nov 1998 |
| 239 | Crestmont Operating LLC | New York, NY 10151 | Oil Operator | Mar 2025 |
| 240 | Crow-Eason | | Oil & Gas Operator | Feb 1984 |
| 241 | Crow-Pittman | | Oil Operator | Aug 1993 |
| 242 | Crowder Oil Co. | | Oil Operator | Sep 2008 |
| 243 | Crowder Oil L.L.C. | | Oil Operator | Apr 2015 |
| 244 | Crumpler Oil | | Oil & Gas Operator | Nov 2024 |
| 245 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 246 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 247 | CSC Energy Corp. | | Oil & Gas Operator | Dec 2009 |
| 248 | Curtis F. Adams | | Oil & Gas Operator | Oct 2024 |
| 249 | CWJ Operating Co., Inc. | | Oil & Gas Operator | Sep 2001 |
| 250 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 251 | Cypress Resources | | Oil & Gas Operator | Jul 2004 |
| 252 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 253 | D-Tec Well Production LLC | | Oil Operator | Dec 2024 |
| 254 | D. B. McConnell Et Al | | Oil & Gas Operator | Nov 1993 |
| 255 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Mar 2025 |
| 256 | D. L. & Barbara W. Chiles | | Oil Operator | Jan 2025 |
| 257 | D. L. Gish Oil Partnership | | Oil Operator | Feb 1989 |
| 258 | D. L. Trainer | | Oil Operator | Mar 1991 |
| 259 | D. S. Owens | | Oil & Gas Operator | Dec 1991 |
| 260 | D. W. Chumley, Jr. | | Oil & Gas Operator | Dec 2024 |
| 261 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 262 | Dalnor Corporation | | Oil & Gas Operator | Nov 2010 |
| 263 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 264 | Dan Owens | | Oil & Gas Operator | Jul 1993 |
| 265 | Daniel Oil Company | | Oil & Gas Operator | Jan 1983 |
| 266 | Danny Glass | | Oil Operator | Jan 1987 |
| 267 | Dave'S Production | | Oil Operator | Dec 2024 |
| 268 | Davenport Production Corp. | | Oil Operator | Sep 1988 |
| 269 | David Crow | | Oil & Gas Operator | Nov 1985 |
| 270 | David Divine Production | | Oil & Gas Operator | Nov 1997 |
| 271 | David Lynn Chiles | | Oil & Gas Operator | Aug 2020 |
| 272 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 273 | Davis And Backus | | Oil Operator | Nov 1999 |
| 274 | Daymon Martin | | Oil Operator | Mar 1983 |
| 275 | DDC & T Operating Company, Inc | | Oil & Gas Operator | Jul 2005 |
| 276 | Debeaux - Flores | | Oil & Gas Operator | Jan 2025 |
| 277 | Dees Production LLC | | Oil Operator | Dec 2024 |
| 278 | Dekasco, Inc. | | Oil & Gas Operator | May 1990 |
| 279 | Delbert A. Dodson | | Oil Operator | Aug 2002 |
| 280 | Deminex U.S. Oil Company | | Oil & Gas Operator | Jan 1998 |
| 281 | Dempsey & Rowe | | Oil Operator | Aug 1986 |
| 282 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 283 | Despot Production Company | | Oil & Gas Operator | May 1983 |
| 284 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 285 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 286 | DGH Petroleum, Inc. | | Oil & Gas Operator | Aug 2011 |
| 287 | Ditta Exploration Co., Inc. | | Oil & Gas Operator | Feb 1990 |
| 288 | Diversified Natural Res., Inc. | | Oil Operator | May 2000 |
| 289 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Mar 2025 |
| 290 | Divine'S Service & Repairs Inc | | Oil & Gas Operator | Mar 1997 |
| 291 | Don Townes | | Oil Operator | Sep 2000 |
| 292 | Don W. Holcomb | | Oil Operator | Feb 1996 |
| 293 | Donald Owens | | Oil & Gas Operator | Dec 2024 |
| 294 | Dossie Dews | | Oil & Gas Operator | Dec 2024 |
| 295 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 296 | Dow Mineral & Royalty Co, Inc | | Oil & Gas Operator | Jun 1994 |
| 297 | Doyle Dempsey | | Oil Operator | May 1997 |
| 298 | DRD Operating Company | | Oil & Gas Operator | Feb 2014 |
| 299 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 300 | Ducharme Oil, LLC | | Oil & Gas Operator | Jan 2025 |