| 2501 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 2502 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2025 |
| 2503 | Cordero Energy Operating LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2020 |
| 2504 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 2505 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 2506 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 2507 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Dec 2025 |
| 2508 | Core Petro, LLC | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 2509 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | Dec 2025 |
| 2510 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 2511 | Corgray Energy, Inc. | Houston, TX 77254 | Gas Operator | Mar 2005 |
| 2512 | Corgray Holdings, LLC | Fulshear, TX 77441 | Gas Operator | Mar 2016 |
| 2513 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 2514 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2025 |
| 2515 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 2516 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 2517 | Cornerstone Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2011 |
| 2518 | Cornerstone Oil Trust | San Antonio, TX 78251 | Oil & Gas Operator | Jul 2003 |
| 2519 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 2520 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Dec 2025 |
| 2521 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 2522 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Dec 2025 |
| 2523 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 2524 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 2525 | Correll, Spencer | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 2526 | Corriente Operating Company LLC | Taft, TX 78390 | Oil & Gas Operator | Dec 2025 |
| 2527 | Corsa Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 2528 | Corsicana Crude Company, LLC | Denver, CO 80202 | Oil Operator | Dec 2025 |
| 2529 | Corsicana Crude Holdings, LLC | Denver, CO 80202 | Oil Operator | Dec 2025 |
| 2530 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 2531 | Corsicana Oil & Gas | Corsicana, TX 75151 | Oil Operator | Dec 2025 |
| 2532 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 2533 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 2534 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 2535 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 2536 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 2537 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2025 |
| 2538 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Dec 2025 |
| 2539 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 2540 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2541 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 2542 | Coterra Energy Inc | Pittsburgh, PA 15275-1121 | Oil & Gas Operator | Sep 2025 |
| 2543 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 2544 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 2545 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Dec 2025 |
| 2546 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 2547 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 2548 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 2549 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 2550 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 2551 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Dec 2025 |
| 2552 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 2553 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 2554 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 2555 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 2556 | County Line Resources LLC | Lancaster, TX 75146 | Oil Operator | Dec 2025 |
| 2557 | County Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 1993 |
| 2558 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 2559 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 2560 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 2561 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 2562 | Covenant Oil & Gas, L.P. | Houston, TX 77057 | Oil & Gas Operator | Dec 2006 |
| 2563 | Covenant Oil Company | Houma, LA 70360 | Oil & Gas Operator | Dec 2015 |
| 2564 | Covenant Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 2565 | Covenant Production Co., L.C. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 2566 | Covered H Energy, LLC | Lubbock, TX 79423 | Oil Operator | Dec 2025 |
| 2567 | Covey Park Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2019 |
| 2568 | Covey Park Resources LLC | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 2569 | Cowboys Resources Corp. | New Braunfels, TX 78132 | Oil Operator | Jan 2008 |
| 2570 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Dec 2025 |
| 2571 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 2572 | Cox Engineering, LLC | Abilene, TX 79605 | Oil Operator | Mar 2006 |
| 2573 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 2574 | Cox Operating Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2000 |
| 2575 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 2576 | Cox, H. L. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jan 2011 |
| 2577 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 2578 | Cox, Lee Investments Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Dec 2025 |
| 2579 | Cox, Martin Regan | Irving, TX 75014 | Oil & Gas Operator | Dec 2025 |
| 2580 | Cox, Robert G. & Associates,Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 1994 |
| 2581 | Coyote Oil Company | Lufkin, TX 75915 | Oil & Gas Operator | Sep 1996 |
| 2582 | Coyote Oil, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Dec 2025 |
| 2583 | Coyote Operating, LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 2584 | Coyote Services, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2002 |
| 2585 | CP Exploration III Operating,LLC | Lafayette, LA 70505 | Oil & Gas Operator | Sep 2023 |
| 2586 | CP Exploration TX Operating LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2017 |
| 2587 | Cpmak Investments, Inc. | Cross Plains, TX 76443 | Oil Operator | Dec 2025 |
| 2588 | CPX Energy Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 2589 | CR Reed Production, Inc. | Gainesville, TX 76241 | Oil Operator | Dec 2025 |
| 2590 | CR2 Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 2591 | CR3 Operating Company, L.L.C. | Houston, TX 77251 | Oil & Gas Operator | Dec 2025 |
| 2592 | Crabtree And Brown, Inc. | Kermit, TX 79745 | Oil & Gas Operator | Feb 1995 |
| 2593 | Craft Resources, Inc. | Weston, TX 75097 | Oil & Gas Operator | Aug 2003 |
| 2594 | Craig Oil, Inc. | Olney, TX 76374 | Oil Operator | Dec 2025 |
| 2595 | Craig, Bob | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 2596 | Craig, Carl | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 2597 | Craig, J. E. G. Estate | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 2598 | Craig, Robert A. | Olney, TX 76374 | Oil Operator | Dec 2025 |
| 2599 | Craig, Wood B Or Monroe, Dianne | Canyon, TX 79015 | Gas Operator | Dec 2025 |
| 2600 | Craig, Wood B. & Bettie | Sunray, TX 79086 | Oil & Gas Operator | Aug 2005 |