| 6401 | Corinthian Exploration (USA) Corp | | Oil & Gas Operator | Feb 2016 |
| 6402 | Cork Petroleum Corporation | Thermopolis, WY 82443 | Oil & Gas Operator | Apr 2012 |
| 6403 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 6404 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Sep 2026 |
| 6405 | Corley G R | | Oil & Gas Operator | Jun 2009 |
| 6406 | Corley Production Company | Wilson, OK 73463-7218 | Oil Operator | Jul 2026 |
| 6407 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |
| 6408 | Corley, Henry Oil Properties LLC | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 6409 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 6410 | Cornelius Dale | Willow, OK 73673 | Oil Operator | Jun 2026 |
| 6411 | Cornelius Oil Company | Kellyville, OK 74039-0459 | Oil & Gas Operator | Jul 2015 |
| 6412 | Cornelius Oil Inc | Kellyville, OK 74039 | Oil & Gas Operator | Jun 2026 |
| 6413 | Cornelius Petroleum Inc | | Oil & Gas Operator | Jun 2026 |
| 6414 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 6415 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | May 2026 |
| 6416 | Cornelius, Steven L | | Oil Operator | Sep 2015 |
| 6417 | Cornell Glen R | Pauls Valley, OK 73075-9606 | Oil & Gas Operator | Oct 2013 |
| 6418 | Cornell Oil Company | | Oil & Gas Operator | May 1985 |
| 6419 | Cornell Rich M - | | Oil & Gas Operator | May 1993 |
| 6420 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 6421 | Corner Operating Company, Inc | New York, NY 10165 | Oil & Gas Operator | Dec 1999 |
| 6422 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 6423 | Cornerstone Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2011 |
| 6424 | Cornerstone Energy, LLC | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 6425 | Cornerstone Gas Processing Inc | | Oil Operator | Jan 1999 |
| 6426 | Cornerstone Minerals LTD | | Oil & Gas Operator | Dec 2009 |
| 6427 | Cornerstone Natural Gas Co. | | Oil Operator | Oct 1999 |
| 6428 | Cornerstone Natural Resources LLC | Denver, CO 80234 | Oil & Gas Operator | Jun 2026 |
| 6429 | Cornerstone Oil Trust | San Antonio, TX 78251 | Oil & Gas Operator | Jul 2003 |
| 6430 | Cornie Creek Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 6431 | Corning Oil Co Inc | Sonora, OH 43785 | Oil & Gas Operator | Dec 2002 |
| 6432 | Cornwell Well Service, Inc. | | Oil & Gas Operator | Feb 2010 |
| 6433 | Cornwell, G. G. | | Oil & Gas Operator | Sep 2009 |
| 6434 | Corona Development Co. Inc. | | Oil Operator | Dec 1989 |
| 6435 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 6436 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Sep 2026 |
| 6437 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 6438 | Coronado Energy Partners LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2026 |
| 6439 | Coronado Great Plains LLC | Tulsa, OK 74137-2832 | Gas Operator | Apr 2013 |
| 6440 | Coronado Kansas, LLC | Tulsa, OK 74133 | Oil Operator | Oct 2009 |
| 6441 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Sep 2026 |
| 6442 | Coronado Oil | Lindsborg, KS 67456 | Oil Operator | Sep 1985 |
| 6443 | Coronado Oil & G | | Oil Operator | Dec 1996 |
| 6444 | Coronado Oil & Gas, Inc. | Great Bend, KS 67530 | Oil Operator | Jul 2004 |
| 6445 | Coronado Oil & Minerals Co. | | Oil & Gas Operator | Sep 1980 |
| 6446 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 6447 | Coronado Oil, Inc. | Salina, KS 67401 | Oil Operator | May 1990 |
| 6448 | Coronado Oklahoma LLC | Tulsa, OK 74133-7036 | Gas Operator | Apr 2020 |
| 6449 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Jun 2026 |
| 6450 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 6451 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 6452 | Corpus Christi Oil & Gas Co. | | Oil & Gas Operator | Dec 1991 |
| 6453 | Correll, Spencer | Perryton, TX 79070 | Oil & Gas Operator | Sep 2026 |
| 6454 | Corrida Oil Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 1990 |
| 6455 | Corriente Operating Company LLC | Taft, TX 78390 | Oil & Gas Operator | Sep 2026 |
| 6456 | Corsa Resources, LLC | Kemah, TX 77565 | Oil & Gas Operator | Sep 2026 |
| 6457 | Corsair Energy, LC | Wichita, KS 67202 | Oil & Gas Operator | Apr 2004 |
| 6458 | Corsicana Crude Company, LLC | Denver, CO 80202 | Oil Operator | Sep 2026 |
| 6459 | Corsicana Crude Holdings, LLC | Denver, CO 80202 | Oil Operator | Sep 2026 |
| 6460 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 6461 | Corsicana Oil & Gas | Corsicana, TX 75151 | Oil Operator | Sep 2026 |
| 6462 | Cortam, Inc. | Augusta, KS 67010 | Oil Operator | Dec 2024 |
| 6463 | Corterra Energy Operating LLC | Tulsa, OK 74119-4844 | Oil & Gas Operator | Aug 2021 |
| 6464 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 6465 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 6466 | Cortland Energy Co Inc | Worthington, OH 43085 | Oil & Gas Operator | Dec 2024 |
| 6467 | Corum Production Co.-Tepco | | Oil & Gas Operator | Dec 1989 |
| 6468 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 6469 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 6470 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 6471 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 6472 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Sep 2026 |
| 6473 | Coseka Resources USA LTD | Denver, CO 80202-1602 | Oil & Gas Operator | Jun 1988 |
| 6474 | Cosgriff Joe | Detroit, MI 48208 | Oil & Gas Operator | Dec 1998 |
| 6475 | Coshocton Pipe Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 6476 | Cosper Well/H Cosper | Logan, OH 43138 | Oil & Gas Operator | Dec 1996 |
| 6477 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Sep 2026 |
| 6478 | Costa Loma LTD. | | Oil & Gas Operator | Dec 2025 |
| 6479 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 6480 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 6481 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 6482 | Coteau Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 6483 | Coterra Energy Inc | Coraopolis, PA 15108-9862 | Oil & Gas Operator | Jun 2026 |
| 6484 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 6485 | Coterra Energy Operating E LLC | Midland, TX 79706 | Oil & Gas Operator | Jan 2026 |
| 6486 | Coterra Energy Operating F LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 6487 | Coterra Energy Operating M LLC | Midland, TX 79706 | Oil & Gas Operator | Aug 2019 |
| 6488 | Cotiga Development Company, Limited Partnership | Williamson, WV 256610000 | Oil & Gas Operator | Dec 2021 |
| 6489 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 6490 | Cotton Petroleum Corp/Apc | Denver, CO 80203-4549 | Oil & Gas Operator | Nov 1990 |
| 6491 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 6492 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 6493 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Sep 2026 |
| 6494 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 6495 | Cotton Well Drilling Co Inc | Sheridan, NY 14135 | Oil & Gas Operator | Dec 2025 |
| 6496 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 6497 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 6498 | Cottonmouth SWD LLC | Tulsa, OK 74103-3522 | Oil Operator | Jun 2026 |
| 6499 | Cottonwood Oil C | | Oil & Gas Operator | Oct 1988 |
| 6500 | Cottonwood Oil Inc | Worland, WY 82401 | Oil & Gas Operator | Jun 1988 |