| 2501 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 2502 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 2503 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Oct 2025 |
| 2504 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Oct 2025 |
| 2505 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 2506 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2507 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 2508 | Coterra Energy Inc | Pittsburgh, PA 15275-1121 | Oil & Gas Operator | Jul 2025 |
| 2509 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 2510 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 2511 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Oct 2025 |
| 2512 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 2513 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 2514 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 2515 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 2516 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 2517 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Oct 2025 |
| 2518 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 2519 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 2520 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 2521 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 2522 | County Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 1993 |
| 2523 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 2524 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 2525 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 2526 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 2527 | Covenant Oil & Gas, L.P. | Houston, TX 77057 | Oil & Gas Operator | Dec 2006 |
| 2528 | Covenant Oil Company | Houma, LA 70360 | Oil & Gas Operator | Dec 2015 |
| 2529 | Covenant Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 2530 | Covenant Production Co., L.C. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 2531 | Covered H Energy, LLC | Lubbock, TX 79423 | Oil Operator | Oct 2025 |
| 2532 | Covey Park Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2019 |
| 2533 | Covey Park Resources LLC | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 2534 | Cowboys Resources Corp. | New Braunfels, TX 78132 | Oil Operator | Jan 2008 |
| 2535 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Oct 2025 |
| 2536 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 2537 | Cox Engineering, LLC | Abilene, TX 79605 | Oil Operator | Mar 2006 |
| 2538 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 2539 | Cox Operating Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2000 |
| 2540 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 2541 | Cox, H. L. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jan 2011 |
| 2542 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 2543 | Cox, Lee Investments Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Oct 2025 |
| 2544 | Cox, Martin Regan | Irving, TX 75014 | Oil & Gas Operator | Oct 2025 |
| 2545 | Cox, Robert G. & Associates,Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 1994 |
| 2546 | Coyote Oil Company | Lufkin, TX 75915 | Oil & Gas Operator | Sep 1996 |
| 2547 | Coyote Oil, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Oct 2025 |
| 2548 | Coyote Operating, LLC | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 2549 | Coyote Services, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2002 |
| 2550 | CP Exploration III Operating,LLC | Lafayette, LA 70505 | Oil & Gas Operator | Sep 2023 |
| 2551 | CP Exploration TX Operating LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2017 |
| 2552 | Cpmak Investments, Inc. | Cross Plains, TX 76443 | Oil Operator | Oct 2025 |
| 2553 | CPX Energy Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2025 |
| 2554 | CR Reed Production, Inc. | Gainesville, TX 76241 | Oil Operator | Oct 2025 |
| 2555 | CR2 Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 2556 | CR3 Operating Company, L.L.C. | Houston, TX 77251 | Oil & Gas Operator | Oct 2025 |
| 2557 | Crabtree And Brown, Inc. | Kermit, TX 79745 | Oil & Gas Operator | Feb 1995 |
| 2558 | Craft Resources, Inc. | Weston, TX 75097 | Oil & Gas Operator | Aug 2003 |
| 2559 | Craig Oil, Inc. | Olney, TX 76374 | Oil Operator | Oct 2025 |
| 2560 | Craig, Bob | Olney, TX 76374 | Oil & Gas Operator | Oct 2025 |
| 2561 | Craig, Carl | Olney, TX 76374 | Oil & Gas Operator | Oct 2025 |
| 2562 | Craig, J. E. G. Estate | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 2563 | Craig, Robert A. | Olney, TX 76374 | Oil Operator | Oct 2025 |
| 2564 | Craig, Wood B Or Monroe, Dianne | Canyon, TX 79015 | Gas Operator | Oct 2025 |
| 2565 | Craig, Wood B. & Bettie | Sunray, TX 79086 | Oil & Gas Operator | Aug 2005 |
| 2566 | Craighead, Ray | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1998 |
| 2567 | Craighead, Ray Well Service Inc | Wichita Falls, TX 76308 | Oil Operator | Apr 2019 |
| 2568 | Craighead, Robert A. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 2569 | Crain Minerals LLC | Oklahoma City, OK 73120-1004 | Oil & Gas Operator | Aug 2014 |
| 2570 | Crampton, Freddie | Holliday, TX 76366 | Oil & Gas Operator | Oct 2025 |
| 2571 | Cranford, Wayne | Electra, TX 76360 | Oil & Gas Operator | Dec 2019 |
| 2572 | Craruth Energy Corporation | Abilene, TX 79602 | Oil & Gas Operator | Oct 2025 |
| 2573 | Craton Energy Company II LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2006 |
| 2574 | Craton Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2005 |
| 2575 | Craton Energy Holdings III, LP | Houston, TX 77002 | Oil & Gas Operator | Jul 2009 |
| 2576 | Craton Operating LLC | Bellaire, TX 77401 | Oil & Gas Operator | Oct 2025 |
| 2577 | Cravey, W. H. | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2012 |
| 2578 | Crawford And Cameron Group | Houston, TX 77074 | Oil & Gas Operator | May 1997 |
| 2579 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 2580 | Crawford Energy, Incorporated | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 2581 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 2582 | Crawford Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Jul 2001 |
| 2583 | Crawford, Linda | Alice, TX 78332 | Oil Operator | Oct 2025 |
| 2584 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 2585 | Crazy Horse Operating LLC | Austin, TX 78731 | Oil & Gas Operator | Oct 2025 |
| 2586 | CRD Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2021 |
| 2587 | Creamer, Donald R., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 2588 | Creative Oil & Gas Operating,LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2024 |
| 2589 | Creative Oil And Gas Op II, LLC | Santa Anna, TX 76878 | Oil Operator | Oct 2025 |
| 2590 | Crebbs Oil Company | Batson, TX 77519 | Oil & Gas Operator | Jun 2024 |
| 2591 | Credo Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jan 2013 |
| 2592 | Creed Operating Co., LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 2593 | Creek Energy, Inc. | Brownwood, TX 76804 | Oil & Gas Operator | Oct 2025 |
| 2594 | Creek Operating Company, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Sep 1998 |
| 2595 | Crego Exploration | Dallas, TX 75243 | Oil & Gas Operator | Oct 2025 |
| 2596 | Cremson Oil & Gas | Coleman, TX 76834 | Oil & Gas Operator | Oct 2025 |
| 2597 | Crenshaw Oil | Wichita Falls, TX 76302 | Oil & Gas Operator | Oct 2025 |
| 2598 | Crenshaw, Joe R. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2003 |
| 2599 | Crenshaw, K. M. | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2018 |
| 2600 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Jun 2025 |