| 401 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 402 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 403 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 404 | Chaparral Operating, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Mar 2025 |
| 405 | Chapco, Inc. | Benavides, TX 78341 | Oil & Gas Operator | Mar 2025 |
| 406 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 407 | Chapman, Ford Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jan 1996 |
| 408 | Chapparal Operating Co. | Fort Worth, TX 76121 | Oil & Gas Operator | Mar 2025 |
| 409 | Chapter Petroleum | Borger, TX 79008 | Oil & Gas Operator | Mar 1997 |
| 410 | Chapter Petroleum, Inc. | Borger, TX 79008 | Oil & Gas Operator | Mar 2001 |
| 411 | Chardonnay Operating, Inc. | Olney, TX 76374 | Oil & Gas Operator | Dec 1996 |
| 412 | Charger Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 413 | Charger Shale Oil Operating, LLC | Austin, TX 78704 | Oil & Gas Operator | Sep 2021 |
| 414 | Charis Oil & Gas, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2025 |
| 415 | Charles A. Bird, Estate | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 416 | Charles D. Self Operating, LLC | Jacksboro, TX 76458 | Oil Operator | Mar 2025 |
| 417 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Mar 2025 |
| 418 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 419 | Charter Petroleum Company | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 420 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 421 | Chase Avenue Corporation, The | Dallas, TX 75219 | Oil & Gas Operator | Jun 2003 |
| 422 | Chase Energy, Inc. | Austin, TX 78763 | Oil & Gas Operator | Oct 2001 |
| 423 | Chase Operating Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2016 |
| 424 | Chase Production Company | Pampa, TX 79066 | Oil & Gas Operator | Mar 2025 |
| 425 | Chasla Energy, LLC | Iowa Park, TX 76367 | Oil Operator | Mar 2025 |
| 426 | Chass Production Co. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Nov 2020 |
| 427 | Chateau Oil And Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2017 |
| 428 | CHB Interests, LLC | Kilgore, TX 75663 | Oil Operator | Oct 2011 |
| 429 | CHB Investments | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2004 |
| 430 | Cheatham Well Service, Inc. | Luling, TX 78648 | Oil Operator | Mar 2025 |
| 431 | Cheatham, Joe R. Oil Co. | Lockhart, TX 78644 | Oil & Gas Operator | Dec 2018 |
| 432 | Cheatham, W. C. | Olney, TX 76374 | Oil & Gas Operator | Feb 2002 |
| 433 | Cheetah Investments, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2025 |
| 434 | Chek Oil Co. | Midland, TX 79708 | Oil & Gas Operator | May 2019 |
| 435 | Chek Oil Co., LLC | Midland, TX 79704 | Oil Operator | Mar 2025 |
| 436 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 437 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | Mar 2025 |
| 438 | Chenoweth, Grover | Gordon, TX 76453 | Oil & Gas Operator | Mar 2025 |
| 439 | Cherco Properties, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Nov 1999 |
| 440 | Cherokee DRLG. & Dev. Corp. | Winnetka, IL 60093 | Oil & Gas Operator | Jan 2003 |
| 441 | Cherokee Production Corp. | Greenville, TX 75401 | Oil & Gas Operator | Mar 2025 |
| 442 | Cherokee Production LLC | Goliad, TX 77963 | Oil Operator | Mar 2025 |
| 443 | Cherry Oil & Gas | Luling, TX 78648 | Oil & Gas Operator | Dec 2000 |
| 444 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 445 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 446 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 447 | Chesapeake Permian LP | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Feb 2015 |
| 448 | Chesher Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2025 |
| 449 | Chesher, Robert | Holliday, TX 76366 | Oil & Gas Operator | Dec 1995 |
| 450 | Chesnut Oil And Gas, Inc. | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Mar 2025 |
| 451 | Chesnutt Oil & Gas, Inc. | Mineral, TX 78125 | Oil & Gas Operator | Mar 2025 |
| 452 | Chessher, Otto Drilling Company | Kearney, MO 64060 | Oil & Gas Operator | Dec 2013 |
| 453 | Chestnut Explor. And Prod., Inc. | Dallas, TX 75208 | Oil & Gas Operator | Mar 2025 |
| 454 | Chestnut Mountain Energy, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Mar 2025 |
| 455 | Chestnut Petroleum, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Nov 2011 |
| 456 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 457 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 458 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 459 | Cheyenne Minerals, Inc. | Houston, TX 77030 | Oil & Gas Operator | Jun 2001 |
| 460 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 461 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 462 | Chicken Coop, Inc., The | Hondo, TX 78861 | Oil & Gas Operator | Jan 2015 |
| 463 | Chico Production Corp. | Bowie, TX 76230 | Oil & Gas Operator | Mar 2025 |
| 464 | Chief Oil & Gas LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2022 |
| 465 | Chief Operating Company | Houston, TX 77070 | Oil & Gas Operator | Feb 2004 |
| 466 | Chief Operating LLC | Dallas, TX 75225 | Gas Operator | Mar 2009 |
| 467 | Chief Petroleum Company | Dallas, TX 75244 | Oil & Gas Operator | Jul 1997 |
| 468 | Childers, J. C. | Borger, TX 79008 | Oil & Gas Operator | Aug 2003 |
| 469 | Chiltipin Production Company | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Mar 2025 |
| 470 | Chilton Energy | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Sep 2006 |
| 471 | China Star Oil Co., LLC | Woodway, TX 76712 | Oil & Gas Operator | Jun 2010 |
| 472 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 473 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2025 |
| 474 | Chisholm Exploration | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 475 | Chisholm Oil & Gas, LC | Buda, TX 78610 | Oil & Gas Operator | Mar 2025 |
| 476 | Chisholm Oil Investments | Seabrook, TX 77586 | Oil & Gas Operator | Mar 2025 |
| 477 | Chisholm Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Mar 2025 |
| 478 | Chisos Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 479 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 480 | Chisum Resources | Shallowater, TX 79363 | Oil Operator | Mar 2025 |
| 481 | Chital Petroleum Corp. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2000 |
| 482 | Chittim Operating LLC | Houston, TX 77079 | Oil & Gas Operator | Mar 2025 |
| 483 | Chmelar, Eugene Oil & Gas | Caldwell, TX 77836 | Oil & Gas Operator | Mar 2025 |
| 484 | Choctaw II Oil & Gas, LTD. | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 485 | Choctaw Resources, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Dec 2019 |
| 486 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Mar 2025 |
| 487 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 488 | CHP Oil & Gas Company, L.C. | El Campo, TX 77437 | Oil & Gas Operator | Mar 2025 |
| 489 | Christensen & Matthews | Houston, TX 77040 | Oil & Gas Operator | Mar 2025 |
| 490 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 491 | Christian Energy, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Mar 2008 |
| 492 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 493 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 494 | Christie Oil Co., Inc | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1996 |
| 495 | Christie, C. B., Jr. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2014 |
| 496 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 497 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 498 | Chumley, George Estate Of | Alice, TX 78333 | Oil & Gas Operator | Mar 2025 |
| 499 | Church Ranch, LLC | Lubbock, TX 79423 | Oil Operator | Mar 2025 |
| 500 | Churchill Operating, LLC | Houston, TX 77007 | Oil & Gas Operator | Mar 2025 |