| 2401 | Cockburn Oil Corporation | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2005 |
| 2402 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Feb 2026 |
| 2403 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 2404 | Cody Company | Amarillo, TX 79121 | Oil & Gas Operator | Mar 2020 |
| 2405 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 2406 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Dec 2025 |
| 2407 | Cody Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Sep 2002 |
| 2408 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 2409 | Coert Holdings 1 LLC | Greenwich, CT 06830 | Oil & Gas Operator | Dec 2021 |
| 2410 | Cofer & Crawford | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 2411 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 2412 | COG Production LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 2413 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 2414 | Cohort Energy Company | Centennial, CO 80112 | Oil & Gas Operator | Feb 2007 |
| 2415 | Coker, Jonathan C., Inc. | Austin, TX 78746 | Oil Operator | Mar 2011 |
| 2416 | Coker, Nel Rey Daws | Throckmorton, TX 76483 | Oil & Gas Operator | Mar 2008 |
| 2417 | Coker, Tom | Seymour, TX 76380 | Oil & Gas Operator | Sep 2006 |
| 2418 | Cokinos, Inc. | Beaumont, TX 77701 | Oil & Gas Operator | Aug 2003 |
| 2419 | Colby Production Resources, LLC | Granbury, TX 76048 | Oil Operator | Feb 2026 |
| 2420 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 2421 | Cole, John Otis | Big Spring, TX 79721 | Oil & Gas Operator | Jan 1999 |
| 2422 | Coleman & Johnson Oil Company | Brownwood, TX 76801 | Oil & Gas Operator | Feb 2026 |
| 2423 | Coleman County Project | Coleman, TX 76834 | Oil & Gas Operator | Oct 2012 |
| 2424 | Coleman Oil & Gas Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Feb 2026 |
| 2425 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 2426 | Colemanite, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2026 |
| 2427 | Coleville Petroleum Company | McAllen, TX 78503 | Oil & Gas Operator | Mar 1996 |
| 2428 | Coley, H. B. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2000 |
| 2429 | Coley, Thomas | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 2430 | Colgate Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 2431 | Collier Oil Field Services Inc | Iowa Park, TX 76367 | Oil & Gas Operator | Feb 2026 |
| 2432 | Collier, Scott Inc. | Holliday, TX 76366 | Oil Operator | May 2003 |
| 2433 | Collier, W. D. Ranch | Post, TX 79356 | Oil & Gas Operator | Jan 2012 |
| 2434 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 2435 | Collins Resources, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2011 |
| 2436 | Colo Construction Co., Inc. | Abilene, TX 79602 | Oil Operator | Apr 2004 |
| 2437 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Feb 2026 |
| 2438 | Cologne Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2014 |
| 2439 | Colorado Bluebonnet Energy Corp. | Englewood, CO 80112 | Oil & Gas Operator | Feb 2001 |
| 2440 | Colorado-Swanson Landing Oil & Gas, LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 2441 | Colotex Operating, LLC | Aurora, CO 80015 | Oil & Gas Operator | Feb 2026 |
| 2442 | Colt Oil & Gas Co. | Abilene, TX 79601 | Oil Operator | Apr 2004 |
| 2443 | Colt Oil Company | Andrews, TX 79714 | Oil & Gas Operator | Feb 1996 |
| 2444 | Colt Operating Corporation | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 2445 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 2446 | Columbia Energy Properties, Inc. | Baytown, TX 77521 | Oil & Gas Operator | Jul 2004 |
| 2447 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 2448 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 2449 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 2450 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 2451 | Comac Well Service, Inc. | Borger, TX 79008 | Oil & Gas Operator | Mar 2008 |
| 2452 | Comal Operating LLC | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 2453 | Comanche Investments | Midland, TX 79706 | Oil & Gas Operator | Aug 1998 |
| 2454 | Comanche Operating Co. | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2002 |
| 2455 | Comanche Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2006 |
| 2456 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 2457 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Feb 2026 |
| 2458 | Comco Of Louisiana, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2000 |
| 2459 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Feb 2026 |
| 2460 | Comet Production | Conroe, TX 77305 | Oil Operator | Feb 2026 |
| 2461 | Cometra Oil And Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1997 |
| 2462 | Common Resources L.L.C. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 2463 | Commonwealth Resources, LLC | Fort Collins, CO 80524 | Oil Operator | Dec 2008 |
| 2464 | Commonwealth Royalty, LLC | Balmorhea, TX 79718 | Oil Operator | Feb 2026 |
| 2465 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 2466 | Compass Exploration, Inc. | Palestine, TX 75802 | Gas Operator | Feb 1999 |
| 2467 | Compass Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 2468 | Compostella Oil Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2469 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 2470 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 2471 | Comstock Oil & Gas, LLC | Frisco, TX 75034 | Oil & Gas Operator | Feb 2026 |
| 2472 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 2473 | Comyn Natural Gas, Inc. | Fort Worth, TX 76163 | Oil & Gas Operator | Feb 2026 |
| 2474 | Con-Lin Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Nov 2017 |
| 2475 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 2476 | Concho Oil & Gas Corp. | Midland, TX 79701 | Oil & Gas Operator | May 2003 |
| 2477 | Concho Oilfield Serv & Oper Co. | Eden, TX 76837 | Oil & Gas Operator | Feb 2026 |
| 2478 | Concho Oilfield Service, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2013 |
| 2479 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 2480 | Concord Energy, Inc. | Glen Rose, TX 76043 | Oil & Gas Operator | Feb 2026 |
| 2481 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 2482 | Concorde Exploration, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 1994 |
| 2483 | Condor Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2484 | Condor Operating Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 2485 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 2486 | Condra, James M. Jr. | Sonora, TX 76950 | Oil & Gas Operator | May 1996 |
| 2487 | Cone & Petree Oil & Gas Exp. Inc | Lubbock, TX 79453 | Oil & Gas Operator | May 2024 |
| 2488 | Cone, Charles M. Services, Inc. | Dallas, TX 75372 | Oil & Gas Operator | Sep 2005 |
| 2489 | Cone, S. E. Jr. | Lubbock, TX 79408 | Oil & Gas Operator | Feb 2002 |
| 2490 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 2491 | Connaway Oil & Gas Co. | Brookesmith, TX 76827 | Oil & Gas Operator | Feb 2016 |
| 2492 | Conner-Marrs Company | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2026 |
| 2493 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 2494 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 2495 | Conquest Energy, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 2496 | Conquest Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Aug 2024 |
| 2497 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 2498 | Cons Asset MGMT SVCS E&P Op, LLC | Houston, TX 77002 | Oil Operator | Dec 2017 |
| 2499 | Consolidated Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 2500 | Consolidated Natural Res. Corp. | Kilgore, TX 75662 | Oil & Gas Operator | Jan 2016 |