| 2201 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Feb 2026 |
| 2202 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2026 |
| 2203 | Cisco Production Company, LLC | Victoria, TX 77902 | Oil & Gas Operator | May 2012 |
| 2204 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Jun 2026 |
| 2205 | Citori Oil Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2004 |
| 2206 | Citori Oil Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2014 |
| 2207 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Dec 2025 |
| 2208 | City Of Dumas | Dumas, TX 79029 | Gas Operator | Jun 2026 |
| 2209 | City Of McLean | McLean, TX 79057 | Gas Operator | Aug 2025 |
| 2210 | City Of Sunray Utilities | Sunray, TX 79086 | Oil & Gas Operator | Jun 2026 |
| 2211 | City Of White Deer | White Deer, TX 79097 | Gas Operator | May 2017 |
| 2212 | Civitas Permian Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2026 |
| 2213 | Civron Petroleum Res., LLC | San Antonio, TX 78229 | Oil & Gas Operator | Jun 2026 |
| 2214 | CJRW Oil & Gas | MC Camey, TX 79752 | Oil Operator | Jun 2026 |
| 2215 | CK Operating Company, LLC | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 2216 | CK5 Services LLC | Zephyr, TX 76890 | Oil & Gas Operator | Sep 2025 |
| 2217 | CKB Corporation | Borger, TX 79008 | Oil & Gas Operator | Aug 1997 |
| 2218 | CL&F Operating LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2022 |
| 2219 | Clamp Operating | San Antonio, TX 78264 | Oil & Gas Operator | Apr 2002 |
| 2220 | Clamp Operating Incorporated | San Antonio, TX 78264 | Oil & Gas Operator | Mar 2011 |
| 2221 | Clark Oil Co. | Dallas, TX 75360 | Oil & Gas Operator | Jun 2026 |
| 2222 | Clark Operating | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2003 |
| 2223 | Clark Operating Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 2224 | Clark, B. C. | Cross Plains, TX 76443 | Oil Operator | Dec 2007 |
| 2225 | Clark, G. A., Trustee | San Antonio, TX 78210 | Oil & Gas Operator | Nov 2017 |
| 2226 | Clark, John M. | Midland, TX 79701 | Oil & Gas Operator | Dec 1993 |
| 2227 | Clark, John M., Inc. | Midland, TX 79704 | Oil & Gas Operator | Jun 2026 |
| 2228 | Clark, Richard E., Inc. | Longview, TX 75604 | Oil & Gas Operator | May 2001 |
| 2229 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Jun 2026 |
| 2230 | Classic Energy Incorporated | Tyler, TX 75701 | Oil & Gas Operator | Jul 2005 |
| 2231 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 2232 | Classic Operating Co. LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 2233 | Classic Petroleum Partners, Inc. | Whitehouse, TX 75791 | Oil & Gas Operator | Jun 2026 |
| 2234 | Claude-Maggie Co. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 2235 | Clausen, A. G. | Cross Plains, TX 76443 | Oil & Gas Operator | Jun 2026 |
| 2236 | Clavo Oil, LLC | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 2237 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 2238 | Clay Petroleum | Prosper, TX 75078 | Oil & Gas Operator | Feb 2023 |
| 2239 | Clay, Charles E. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2010 |
| 2240 | Clay, Jerry H. | Tyler, TX 75702 | Oil & Gas Operator | Mar 2006 |
| 2241 | Clayton Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | May 2004 |
| 2242 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 2243 | CLC Operations Inc | Midland, TX 79701 | Oil & Gas Operator | Mar 1997 |
| 2244 | Cleantex Oilfield Services, LLC | Tyler, TX 75702 | Oil Operator | Jun 2026 |
| 2245 | Clear Brooke Ranches, LLC | Fort Worth, TX 76179 | Oil & Gas Operator | Jun 2026 |
| 2246 | Clear Fork Gas Company | Albany, TX 76430 | Oil & Gas Operator | Jun 2026 |
| 2247 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | Jun 2026 |
| 2248 | Clear Water Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 2249 | Clearfork Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2011 |
| 2250 | Clearfork Petroleum Inc. (A) | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2026 |
| 2251 | Clearfork Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 2252 | Clearly Petroleum, LLC | Houston, TX 77086 | Oil & Gas Operator | Jun 2020 |
| 2253 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 2254 | Clements Exploration Co | Oklahoma City, OK 73132-5922 | Oil & Gas Operator | Jan 2006 |
| 2255 | Clements Operating Company, Inc. | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 2256 | Clemons, Tony W. | Minden, LA 71055 | Oil & Gas Operator | Dec 2016 |
| 2257 | Cleo Oil, Inc. | Olney, TX 76374 | Oil & Gas Operator | May 1997 |
| 2258 | Cleveland Oil & Gas | Wichita Falls, TX 76308 | Oil Operator | Jun 2026 |
| 2259 | Cleveland Oil Company,L.L.C.,The | Midland, TX 79702 | Oil & Gas Operator | Sep 1999 |
| 2260 | Cleveland Production Company | Summit, MS 39666 | Oil & Gas Operator | Jul 1999 |
| 2261 | Click Corp | Monroe, LA 71207 | Oil & Gas Operator | Jan 2025 |
| 2262 | Click Energy Company | Houston, TX 77269 | Oil & Gas Operator | Jun 2026 |
| 2263 | Clide Oil Corp. | Iraan, TX 79744 | Oil & Gas Operator | Nov 2015 |
| 2264 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 2265 | Clifton Oil | Muenster, TX 76252 | Oil & Gas Operator | Mar 2006 |
| 2266 | Clifton, B.W. | Graham, TX 76450 | Oil & Gas Operator | Mar 2000 |
| 2267 | Clifton, Joe B. Exploration, Inc | Pauls Valley, OK 73075 | Oil & Gas Operator | Mar 2008 |
| 2268 | Clipper Operating Co., Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 2000 |
| 2269 | CLM Operating | Graham, TX 76450 | Oil & Gas Operator | Aug 2017 |
| 2270 | Close, Bryan H. | Shamrock, TX 79079 | Gas Operator | Jun 2026 |
| 2271 | Clover Production Company | Sourlake, TX 77659 | Oil & Gas Operator | Jun 2026 |
| 2272 | CLR Gauging Corp. | Tuleta, TX 78162 | Oil & Gas Operator | Jun 2026 |
| 2273 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Jun 2026 |
| 2274 | CLS Interests, Incorporated | Austin, TX 78734 | Oil & Gas Operator | Jan 1997 |
| 2275 | CLS Petroleum Holdings LLC | Iowa Park, TX 76367 | Oil Operator | Jun 2026 |
| 2276 | CM Oil Co. | FT Stockton, TX 79735 | Oil & Gas Operator | Jun 2026 |
| 2277 | CM TX Production, LLC | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2023 |
| 2278 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Jun 2026 |
| 2279 | CMR Energy, L.P. | Houston, TX 77077 | Oil & Gas Operator | Jun 2026 |
| 2280 | CMR Oil, LLC | McKinney, TX 75072 | Oil Operator | Jun 2026 |
| 2281 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 2282 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 2283 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 2284 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 2285 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Jun 2026 |
| 2286 | Co-Co Oil, Inc. | Lubbock, TX 79407 | Oil & Gas Operator | Aug 2003 |
| 2287 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 2288 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 2289 | Coastal Bend Petroleum Corp. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Dec 2002 |
| 2290 | Coastal Expanse Oil & Gas | Austin, TX 78704 | Oil & Gas Operator | Jun 2026 |
| 2291 | Coastal Investments Inc. | El Campo, TX 77437 | Oil & Gas Operator | Jun 2026 |
| 2292 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2293 | Coastal New Mexico MGMT LLC | Carlsbad, NM 88220 | Oil & Gas Operator | Jun 2026 |
| 2294 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 2295 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jun 2026 |
| 2296 | Coastal Plains Exploration, LLC | Port Lavaca, TX 77979 | Oil & Gas Operator | Jun 2026 |
| 2297 | Coastal Production Company, Inc. | El Campo, TX 77437 | Oil & Gas Operator | Aug 1995 |
| 2298 | Coastal Shoreline Corp. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Aug 2003 |
| 2299 | Coastland Operations, LLC | Dallas, TX 75287 | Oil & Gas Operator | Jun 2026 |
| 2300 | Coastline Exploration, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Jun 2026 |