| 201 | C12 Energy: North Dakota LLC | | Oil Operator | Apr 2017 |
| 202 | C12 Kansas Oil, LLC | Denver, CO 80202 | Oil Operator | Dec 2009 |
| 203 | C3oil, LLC | New Strawn, KS 66839 | Oil Operator | Sep 2025 |
| 204 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 205 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Feb 2026 |
| 206 | Ca-Dora Inc | Waterford, OH 45786 | Oil & Gas Operator | Dec 1984 |
| 207 | Caac 100 LLC | | Oil & Gas Operator | Dec 2025 |
| 208 | Cab Resources, LLC | Odessa, TX 79762 | Oil Operator | Feb 2026 |
| 209 | Caba, LLC | | Oil Operator | Jan 2025 |
| 210 | Cabal Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 211 | Caballero Operations LLC | | Oil & Gas Operator | Dec 2025 |
| 212 | Cabana Oil Corp. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2006 |
| 213 | Cabco Energy Corporation | Hoffman, OK 74437 | Oil & Gas Operator | Dec 2018 |
| 214 | Cabeza Oil And Gas, LLC | Austin, CO 81410 | Oil & Gas Operator | Mar 2022 |
| 215 | Cable W S | Cleveland, OK 74020 | Oil Operator | Jan 2021 |
| 216 | Cabot Exploration Corp | Houston, TX 77070 | Oil Operator | Jun 1999 |
| 217 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2025 |
| 218 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 219 | Cabot Petroleum | | Oil & Gas Operator | Oct 1996 |
| 220 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 221 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 222 | Cactus Gas & Oil, Inc. | San Antonio, TX 78259 | Oil & Gas Operator | Feb 2026 |
| 223 | Cactus Jack Operating Company | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2003 |
| 224 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 225 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 226 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 227 | Cactus Operating Company, LLC | Lovington, NM 88260 | Oil & Gas Operator | Jul 2005 |
| 228 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 229 | Cad Energy Corporation | Creston, WV 26141 | Oil & Gas Operator | Dec 2021 |
| 230 | Cada Operating, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2004 |
| 231 | Caddeaux Gathering, LLC | | Oil Operator | Dec 2024 |
| 232 | Caddell Well Service, Inc. | Prairie Lea, TX 78661 | Oil & Gas Operator | Feb 2026 |
| 233 | Caddo Corporation | Austin, TX 78731 | Oil & Gas Operator | Feb 2026 |
| 234 | Caddo Creek Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 1994 |
| 235 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Dec 2025 |
| 236 | Caddo Gas Processing L.L.C. | | Oil Operator | Aug 2012 |
| 237 | Caddo Management, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 238 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 239 | Caddo Oil & Gas Co., Inc. | | Oil Operator | Jul 1990 |
| 240 | Caddo Oil Co.,Inc. | | Oil & Gas Operator | Apr 1987 |
| 241 | Caddo Operating Inc. | Marshall, TX 75671 | Oil & Gas Operator | Feb 2026 |
| 242 | Caddo Parish Holdings LLC | | Oil & Gas Operator | Jul 2020 |
| 243 | Caddo Petroleum Dev., Inc. | | Oil Operator | Aug 1986 |
| 244 | Caddo Pine Island Corp. | | Oil & Gas Operator | Sep 1997 |
| 245 | Caddo Pine Island Operating Co | | Oil & Gas Operator | Aug 1998 |
| 246 | Caddo Resources Inc | | Oil & Gas Operator | Dec 1986 |
| 247 | Caddo Western Development, Inc | | Oil & Gas Operator | Aug 1984 |
| 248 | Caddo-Marchand LC | Dallas, TX 75251-2202 | Oil & Gas Operator | Oct 2016 |
| 249 | Cadence Energy Partners, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Jun 2010 |
| 250 | Cadillac Operating Company, LLC | | Oil Operator | Jan 2025 |
| 251 | Cady Myrle L | Sugar Grove, PA 16350-9803 | Oil & Gas Operator | Dec 2025 |
| 252 | Caelus Natural Resources Alaska, LLC | | Oil & Gas Operator | Jul 2019 |
| 253 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 254 | Caerus Northern Rockies LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2021 |
| 255 | Caerus Piceance LLC | | Oil & Gas Operator | Sep 2025 |
| 256 | Caerus Southern Rockies LLC | Denver, CO 80202 | Gas Operator | Nov 2017 |
| 257 | Caerus Washco LLC | Denver, CO 80202 | Gas Operator | Mar 2015 |
| 258 | Caflisch, James E. | Clymer, NY 14724 | Gas Operator | Dec 2024 |
| 259 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | Feb 2026 |
| 260 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Feb 2026 |
| 261 | Cahoj, H. Drilling | McDonald, KS 67745 | Oil Operator | Jan 2000 |
| 262 | Cain Glen | | Oil Operator | Dec 2016 |
| 263 | Cain Randy A | Duncan, OK 73533 | Oil & Gas Operator | Dec 2025 |
| 264 | Cain Richard | Comanche, OK 73529-1248 | Oil & Gas Operator | May 2020 |
| 265 | Cain, Chas | Lexington, KY 40509 | Oil & Gas Operator | Dec 2023 |
| 266 | Cain, Francis E. | Big Bend, WV 26136-0080 | Oil & Gas Operator | Dec 2021 |
| 267 | Cain, Jim | Great Bend, KS 67530 | Oil Operator | Feb 2009 |
| 268 | Cain, L. L. & White, Wayne R. | Lubbock, TX 79407 | Oil & Gas Operator | Apr 2005 |
| 269 | Cain, Milton | Big Bend, WV 26136-0008 | Oil & Gas Operator | Dec 2021 |
| 270 | Cain, Nicholas A & Darry R | | Oil Operator | Dec 2003 |
| 271 | Caird Operating, LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Feb 2026 |
| 272 | Cairn Energy Partners, LLC | | Oil & Gas Operator | Feb 2023 |
| 273 | Cajeza Energy | Drumright, OK 74030 | Oil & Gas Operator | May 2013 |
| 274 | Cajun Minerals, Inc. | | Oil & Gas Operator | Mar 1997 |
| 275 | Cajun Operating, Inc. | | Oil & Gas Operator | Jun 2011 |
| 276 | Cal Ban Corp. | Olean, NY 14760 | Oil & Gas Operator | Dec 2023 |
| 277 | Cal Continental Capital Inc. | | Oil Operator | Dec 2006 |
| 278 | Cal Oil | | Oil Operator | Jul 1986 |
| 279 | Cal Oil Company | Missouri City, TX 77459 | Oil Operator | May 2022 |
| 280 | Cal-Mon Oil Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 281 | Cal-T Oil Company, Incorporated | Borger, TX 79008 | Oil & Gas Operator | Feb 2008 |
| 282 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | Feb 2026 |
| 283 | Cal-Tex Fossil, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 284 | Cal-Tex Gas Transmission Co,Inc. | Mabank, TX 75147 | Oil & Gas Operator | Nov 1999 |
| 285 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 286 | Cala Oil & Gas | | Oil & Gas Operator | Oct 1997 |
| 287 | Calais Oil & Gas, L.L.C. | | Oil Operator | Dec 2024 |
| 288 | Calam Oil Prop - | | Gas Operator | Sep 1999 |
| 289 | Calame, Richard | Devine, TX 78016 | Oil Operator | Feb 2026 |
| 290 | Calarie Lee J & Lisa A | Rural Valley, PA 16249-4113 | Oil & Gas Operator | Dec 2025 |
| 291 | Calco Inc | | Oil & Gas Operator | Feb 1991 |
| 292 | Caldera Operating Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 293 | Caldera Resources LLC | Smicksburg, PA 16256-0055 | Gas Operator | Dec 2025 |
| 294 | Caldwell & Self | | Oil Operator | Dec 2024 |
| 295 | Caldwell & Trahan | | Oil Operator | Dec 2024 |
| 296 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 297 | Caldwell Entr In | | Oil Operator | Dec 1993 |
| 298 | Caldwell Oil Company | | Oil Operator | Jul 2012 |
| 299 | Caldwell Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 300 | Caldwell Production | | Oil Operator | Dec 2024 |