| 2401 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 2402 | Concord Energy, Inc. | Glen Rose, TX 76043 | Oil & Gas Operator | Oct 2025 |
| 2403 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 2404 | Concorde Exploration, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 1994 |
| 2405 | Condor Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2406 | Condor Operating Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 2407 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 2408 | Condra, James M. Jr. | Sonora, TX 76950 | Oil & Gas Operator | May 1996 |
| 2409 | Cone & Petree Oil & Gas Exp. Inc | Lubbock, TX 79453 | Oil & Gas Operator | May 2024 |
| 2410 | Cone, Charles M. Services, Inc. | Dallas, TX 75372 | Oil & Gas Operator | Sep 2005 |
| 2411 | Cone, S. E. Jr. | Lubbock, TX 79408 | Oil & Gas Operator | Feb 2002 |
| 2412 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 2413 | Connaway Oil & Gas Co. | Brookesmith, TX 76827 | Oil & Gas Operator | Feb 2016 |
| 2414 | Conner-Marrs Company | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2025 |
| 2415 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 2416 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 2417 | Conquest Energy, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |
| 2418 | Conquest Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Aug 2024 |
| 2419 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | Oct 2025 |
| 2420 | Cons Asset MGMT SVCS E&P Op, LLC | Houston, TX 77002 | Oil Operator | Dec 2017 |
| 2421 | Consolidated Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 2422 | Consolidated Natural Res. Corp. | Kilgore, TX 75662 | Oil & Gas Operator | Jan 2016 |
| 2423 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 2424 | Consolidated Petro PTNRS I, LLC | Austin, TX 78759 | Oil & Gas Operator | Mar 2003 |
| 2425 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 2426 | Contango Operators, Inc. | Houston, TX 77098 | Oil & Gas Operator | Dec 2022 |
| 2427 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |
| 2428 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 2429 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Oct 2025 |
| 2430 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 2431 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 2432 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 2433 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 2434 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Oct 2025 |
| 2435 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 2436 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 2437 | Contour Expl And Prod, LLC | Dallas, TX 75204 | Oil & Gas Operator | Oct 2025 |
| 2438 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 2439 | Contract Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2012 |
| 2440 | Contract Oil & Gas Service Co. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2007 |
| 2441 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 2442 | Convert Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2019 |
| 2443 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 2444 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Oct 2025 |
| 2445 | Cook D L | Holliday, TX 76366 | Oil & Gas Operator | Dec 2008 |
| 2446 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | Oct 2025 |
| 2447 | Cook Marshall Operating, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 1995 |
| 2448 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | Oct 2025 |
| 2449 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Oct 2025 |
| 2450 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 2451 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 2452 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 2453 | Cooper Oil & Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2010 |
| 2454 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 2455 | Cooper Operating | Olney, TX 76374 | Oil Operator | Apr 2007 |
| 2456 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 2457 | Cooper, Glenn W. Oil & Gas | Seymour, TX 76380 | Oil & Gas Operator | Feb 2000 |
| 2458 | Copano Company | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2459 | Copano Gas Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2460 | Cope Oil Company | Valley VIew, TX 76272 | Oil & Gas Operator | Feb 2015 |
| 2461 | Copestone Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Oct 2025 |
| 2462 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 2463 | Copperhead Oil & Gas, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2017 |
| 2464 | Coppertop | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 2465 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 2466 | Coral E&P, LLC | Adkins, TX 78101 | Oil & Gas Operator | Oct 2025 |
| 2467 | Corbell, W. D. | Dublin, TX 76446 | Oil & Gas Operator | Dec 2001 |
| 2468 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 2469 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Oct 2025 |
| 2470 | Cordero Energy Operating LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2020 |
| 2471 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 2472 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 2473 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 2474 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 2475 | Core Petro, LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 2476 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | Oct 2025 |
| 2477 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Oct 2025 |
| 2478 | Corgray Holdings, LLC | Fulshear, TX 77441 | Gas Operator | Mar 2016 |
| 2479 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 2480 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Oct 2025 |
| 2481 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 2482 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 2483 | Cornerstone Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2011 |
| 2484 | Cornerstone Oil Trust | San Antonio, TX 78251 | Oil & Gas Operator | Jul 2003 |
| 2485 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 2486 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Oct 2025 |
| 2487 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 2488 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 2489 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 2490 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 2491 | Correll, Spencer | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 2492 | Corriente Operating Company LLC | Taft, TX 78390 | Oil & Gas Operator | Oct 2025 |
| 2493 | Corsa Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 2494 | Corsicana Crude Company, LLC | Denver, CO 80202 | Oil Operator | Oct 2025 |
| 2495 | Corsicana Crude Holdings, LLC | Denver, CO 80202 | Oil Operator | Oct 2025 |
| 2496 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 2497 | Corsicana Oil & Gas | Corsicana, TX 75151 | Oil Operator | Oct 2025 |
| 2498 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 2499 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 2500 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |