| 6401 | Cornerstone Gas Processing Inc | | Oil Operator | Jan 1999 |
| 6402 | Cornerstone Minerals LTD | | Oil & Gas Operator | Dec 2009 |
| 6403 | Cornerstone Natural Gas Co. | | Oil Operator | Oct 1999 |
| 6404 | Cornerstone Natural Resources LLC | Denver, CO 80234 | Oil & Gas Operator | Apr 2026 |
| 6405 | Cornerstone Oil Trust | San Antonio, TX 78251 | Oil & Gas Operator | Jul 2003 |
| 6406 | Cornie Creek Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 6407 | Corning Oil Co Inc | Sonora, OH 43785 | Oil & Gas Operator | Dec 2002 |
| 6408 | Cornwell Well Service, Inc. | | Oil & Gas Operator | Feb 2010 |
| 6409 | Cornwell, G. G. | | Oil & Gas Operator | Sep 2009 |
| 6410 | Corona Development Co. Inc. | | Oil Operator | Dec 1989 |
| 6411 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 6412 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Jun 2026 |
| 6413 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 6414 | Coronado Energy Partners LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 6415 | Coronado Great Plains LLC | Tulsa, OK 74137-2832 | Gas Operator | Apr 2013 |
| 6416 | Coronado Kansas, LLC | Tulsa, OK 74133 | Oil Operator | Oct 2009 |
| 6417 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Jun 2026 |
| 6418 | Coronado Oil | Lindsborg, KS 67456 | Oil Operator | Sep 1985 |
| 6419 | Coronado Oil & G | | Oil Operator | Dec 1996 |
| 6420 | Coronado Oil & Gas, Inc. | Great Bend, KS 67530 | Oil Operator | Jul 2004 |
| 6421 | Coronado Oil & Minerals Co. | | Oil & Gas Operator | Sep 1980 |
| 6422 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 6423 | Coronado Oil, Inc. | Salina, KS 67401 | Oil Operator | May 1990 |
| 6424 | Coronado Oklahoma LLC | Tulsa, OK 74133-7036 | Gas Operator | Apr 2020 |
| 6425 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Mar 2026 |
| 6426 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 6427 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 6428 | Corpus Christi Oil & Gas Co. | | Oil & Gas Operator | Dec 1991 |
| 6429 | Correll, Spencer | Perryton, TX 79070 | Oil & Gas Operator | Jun 2026 |
| 6430 | Corrida Oil Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 1990 |
| 6431 | Corriente Operating Company LLC | Taft, TX 78390 | Oil & Gas Operator | Jun 2026 |
| 6432 | Corsa Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 6433 | Corsair Energy, LC | Wichita, KS 67202 | Oil & Gas Operator | Apr 2004 |
| 6434 | Corsicana Crude Company, LLC | Denver, CO 80202 | Oil Operator | Jun 2026 |
| 6435 | Corsicana Crude Holdings, LLC | Denver, CO 80202 | Oil Operator | Jun 2026 |
| 6436 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 6437 | Corsicana Oil & Gas | Corsicana, TX 75151 | Oil Operator | Jun 2026 |
| 6438 | Cortam, Inc. | Augusta, KS 67010 | Oil Operator | Dec 2024 |
| 6439 | Corterra Energy Operating LLC | Tulsa, OK 74119-4844 | Oil & Gas Operator | Aug 2021 |
| 6440 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 6441 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 6442 | Cortland Energy Co Inc | Worthington, OH 43085 | Oil & Gas Operator | Dec 2024 |
| 6443 | Corum Production Co.-Tepco | | Oil & Gas Operator | Dec 1989 |
| 6444 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 6445 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 6446 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 6447 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 6448 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jun 2026 |
| 6449 | Coseka Resources USA LTD | Denver, CO 80202-1602 | Oil & Gas Operator | Jun 1988 |
| 6450 | Cosgriff Joe | Detroit, MI 48208 | Oil & Gas Operator | Dec 1998 |
| 6451 | Coshocton Pipe Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 6452 | Cosper Well/H Cosper | Logan, OH 43138 | Oil & Gas Operator | Dec 1996 |
| 6453 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Jun 2026 |
| 6454 | Costa Loma LTD. | | Oil & Gas Operator | Dec 2025 |
| 6455 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 6456 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 6457 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 6458 | Coteau Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 6459 | Coterra Energy Inc | Coraopolis, PA 15108-9862 | Oil & Gas Operator | Mar 2026 |
| 6460 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 6461 | Coterra Energy Operating E LLC | Midland, TX 79706 | Oil & Gas Operator | Jan 2026 |
| 6462 | Coterra Energy Operating F LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 6463 | Coterra Energy Operating M LLC | Midland, TX 79706 | Oil & Gas Operator | Aug 2019 |
| 6464 | Cotiga Development Company, Limited Partnership | Williamson, WV 25661-0000 | Oil & Gas Operator | Dec 2021 |
| 6465 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 6466 | Cotton Petroleum Corp/Apc | Denver, CO 80203-4549 | Oil & Gas Operator | Nov 1990 |
| 6467 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 6468 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 6469 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Jun 2026 |
| 6470 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 6471 | Cotton Well Drilling Co Inc | Sheridan, NY 14135 | Oil & Gas Operator | Dec 2024 |
| 6472 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 6473 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 6474 | Cottonmouth SWD LLC | Tulsa, OK 74103-3522 | Oil Operator | Mar 2026 |
| 6475 | Cottonwood Oil C | | Oil & Gas Operator | Oct 1988 |
| 6476 | Cottonwood Oil Inc | Worland, WY 82401 | Oil & Gas Operator | Jun 1988 |
| 6477 | Cottonwood Opr Corp | | Gas Operator | Dec 1989 |
| 6478 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 6479 | Cottonwood Prod Co Inc | Buffalo, NY 14202-2212 | Gas Operator | Dec 2002 |
| 6480 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 6481 | Cotula Oil & Gas Co., Inc. | Cross Plains, TX 76443 | Oil Operator | Jun 2026 |
| 6482 | Couch Donald W | Marlow, OK 73055 | Oil & Gas Operator | Apr 2026 |
| 6483 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 6484 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Jun 2026 |
| 6485 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 6486 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 6487 | Cougar Energies, Inc. | Oberlin, KS 67749 | Oil Operator | Jun 1996 |
| 6488 | Cougar Energy Inc | Oil City, PA 16301-4046 | Oil & Gas Operator | Dec 2013 |
| 6489 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 6490 | Cougar Exploration, Inc. | | Oil & Gas Operator | Jun 1988 |
| 6491 | Cougar Oil | | Oil Operator | Jan 2026 |
| 6492 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 6493 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 6494 | Coughlin, Daniel L | | Oil Operator | Aug 2000 |
| 6495 | Coulthurst MGT & Inv Inc | Reno, NV 89504 | Oil Operator | Sep 2020 |
| 6496 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Dec 2025 |
| 6497 | Country Boy Oil Co Inc | | Oil Operator | Nov 2017 |
| 6498 | Country Side Sand & Gravel, Inc | Collins, NY 14034 | Gas Operator | Dec 2024 |
| 6499 | Countrymark Energy Resources L L C | MT Vernon, IN 47620 | Oil & Gas Operator | Dec 2024 |
| 6500 | County Line Resources LLC | Lancaster, TX 75146 | Oil Operator | Jun 2026 |