| 2501 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 2502 | Consolidated Petro PTNRS I, LLC | Austin, TX 78759 | Oil & Gas Operator | Mar 2003 |
| 2503 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 2504 | Contango Operators, Inc. | Houston, TX 77098 | Oil & Gas Operator | Dec 2022 |
| 2505 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 2506 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2026 |
| 2507 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Feb 2026 |
| 2508 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 2509 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 2510 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Feb 2026 |
| 2511 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Feb 2026 |
| 2512 | Continental U.S. Management Corp | Dallas, TX 75240 | Oil & Gas Operator | Oct 2016 |
| 2513 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Feb 2026 |
| 2514 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 2515 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 2516 | Contour Expl And Prod, LLC | Dallas, TX 75204 | Oil & Gas Operator | Feb 2026 |
| 2517 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 2518 | Contract Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2012 |
| 2519 | Contract Oil & Gas Service Co. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2007 |
| 2520 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2026 |
| 2521 | Convert Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2019 |
| 2522 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 2523 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Feb 2026 |
| 2524 | Cook D L | Holliday, TX 76366 | Oil & Gas Operator | Dec 2008 |
| 2525 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | Feb 2026 |
| 2526 | Cook Marshall Operating, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 1995 |
| 2527 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | Feb 2026 |
| 2528 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Feb 2026 |
| 2529 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 2530 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 2531 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Feb 2026 |
| 2532 | Cooper Oil & Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2010 |
| 2533 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 2534 | Cooper Operating | Olney, TX 76374 | Oil Operator | Apr 2007 |
| 2535 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 2536 | Cooper Six C Oil LLC | Ponder, TX 76259 | Oil & Gas Operator | Feb 2026 |
| 2537 | Cooper, Glenn W. Oil & Gas | Seymour, TX 76380 | Oil & Gas Operator | Feb 2000 |
| 2538 | Copano Company | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2539 | Copano Gas Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2540 | Cope Oil Company | Valley VIew, TX 76272 | Oil & Gas Operator | Feb 2015 |
| 2541 | Copestone Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Feb 2026 |
| 2542 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 2543 | Copperhead Oil & Gas, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2017 |
| 2544 | Coppertop | San Angelo, TX 76904 | Oil & Gas Operator | Feb 2026 |
| 2545 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 2546 | Coral E&P, LLC | Adkins, TX 78101 | Oil & Gas Operator | Feb 2026 |
| 2547 | Corbell, W. D. | Dublin, TX 76446 | Oil & Gas Operator | Dec 2001 |
| 2548 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 2549 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Feb 2026 |
| 2550 | Cordero Energy Operating LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2020 |
| 2551 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 2552 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 2553 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 2554 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Feb 2026 |
| 2555 | Core Petro, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 2556 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | Feb 2026 |
| 2557 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Feb 2026 |
| 2558 | Corgray Energy, Inc. | Houston, TX 77254 | Gas Operator | Mar 2005 |
| 2559 | Corgray Holdings, LLC | Fulshear, TX 77441 | Gas Operator | Mar 2016 |
| 2560 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 2561 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Feb 2026 |
| 2562 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 2563 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 2564 | Cornerstone Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2011 |
| 2565 | Cornerstone Oil Trust | San Antonio, TX 78251 | Oil & Gas Operator | Jul 2003 |
| 2566 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 2567 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Feb 2026 |
| 2568 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 2569 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Feb 2026 |
| 2570 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 2571 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 2572 | Correll, Spencer | Perryton, TX 79070 | Oil & Gas Operator | Feb 2026 |
| 2573 | Corriente Operating Company LLC | Taft, TX 78390 | Oil & Gas Operator | Feb 2026 |
| 2574 | Corsa Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 2575 | Corsicana Crude Company, LLC | Denver, CO 80202 | Oil Operator | Feb 2026 |
| 2576 | Corsicana Crude Holdings, LLC | Denver, CO 80202 | Oil Operator | Feb 2026 |
| 2577 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 2578 | Corsicana Oil & Gas | Corsicana, TX 75151 | Oil Operator | Feb 2026 |
| 2579 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 2580 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 2581 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 2582 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 2583 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 2584 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2026 |
| 2585 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Feb 2026 |
| 2586 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 2587 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2588 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 2589 | Coterra Energy Inc | Coraopolis, PA 15108-9862 | Oil & Gas Operator | Dec 2025 |
| 2590 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 2591 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 2592 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Feb 2026 |
| 2593 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 2594 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 2595 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 2596 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 2597 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 2598 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Feb 2026 |
| 2599 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 2600 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |