| 6501 | Cooper, Lowell E. | Peabody, KS 66866 | Oil Operator | Nov 1987 |
| 6502 | Coors Energy | Golden, CO 80402-0467 | Oil & Gas Operator | Sep 1992 |
| 6503 | Coots, Jesse | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 6504 | Copano Company | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 6505 | Copano Gas Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 6506 | Cope Oil Company | Valley VIew, TX 76272 | Oil & Gas Operator | Feb 2015 |
| 6507 | Copeland Gas LLC | Albion, PA 16401 | Gas Operator | Dec 2024 |
| 6508 | Copestone Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Oct 2025 |
| 6509 | Copper Land Resources LLC | | Oil Operator | Jul 2025 |
| 6510 | Copper Ridge Oil Inc | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 6511 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 6512 | Copperhead Creek Enterprises, Inc. | Chautauqua, KS 67334 | Oil Operator | Sep 2019 |
| 6513 | Copperhead Enterprises LLC | Ludlow, PA 16333-0057 | Oil & Gas Operator | Dec 2024 |
| 6514 | Copperhead Oil | Colony, KS 66015 | Oil Operator | Sep 1985 |
| 6515 | Copperhead Oil & Gas, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2017 |
| 6516 | Coppertop | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 6517 | Coppock Herb Energy | Fairview, OK 73737-1037 | Oil & Gas Operator | May 2018 |
| 6518 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 6519 | Coral Coast Petroleum, L.C. | Wichita, KS 67226 | Oil & Gas Operator | Nov 2019 |
| 6520 | Coral E&P, LLC | Adkins, TX 78101 | Oil & Gas Operator | Oct 2025 |
| 6521 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2025 |
| 6522 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 6523 | Corbell, W. D. | Dublin, TX 76446 | Oil & Gas Operator | Dec 2001 |
| 6524 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 6525 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Oct 2025 |
| 6526 | Cordero Energy Operating LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2020 |
| 6527 | Cordero Mining Co | Gillette, WY 82717 | Oil Operator | Nov 2009 |
| 6528 | Cordero Oil And Gas LLC | Gillette, WY 82716 | Oil Operator | Nov 2021 |
| 6529 | Cordex Petroleums, Inc. | | Oil & Gas Operator | Jun 1996 |
| 6530 | Cordillera Corporation | Denver, CO 80237 | Oil & Gas Operator | Feb 1996 |
| 6531 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Jun 2025 |
| 6532 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 6533 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 6534 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 6535 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 6536 | Core Antrim Company LLC | | Gas Operator | Aug 2025 |
| 6537 | Core Appalachia Operating LLC | Charleston, WV 25362 | Oil & Gas Operator | Dec 2023 |
| 6538 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 6539 | Core Energy LLC | | Oil & Gas Operator | Aug 2025 |
| 6540 | Core Minerals Operating Co Inc | | Oil & Gas Operator | Dec 2023 |
| 6541 | Core Petro, LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 6542 | Core Solutions LLC | | Oil & Gas Operator | Dec 2021 |
| 6543 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | Oct 2025 |
| 6544 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Oct 2025 |
| 6545 | Corfu Darien Properties, LLC | Corfu, NY 14036 | Gas Operator | Dec 2024 |
| 6546 | Corgray Holdings, LLC | Fulshear, TX 77441 | Gas Operator | Mar 2016 |
| 6547 | Corie Oil Co., Inc. | Russell, KS 67665 | Oil Operator | Feb 2003 |
| 6548 | Corie Oil Compan | | Oil Operator | Jul 1985 |
| 6549 | Corinne Grace | Carlsbad, NM 88220 | Oil & Gas Operator | Jan 2011 |
| 6550 | Corinthian Exploration (USA) Corp | | Oil & Gas Operator | Apr 2016 |
| 6551 | Cork Petroleum Corporation | Thermopolis, WY 82443 | Oil & Gas Operator | Apr 2012 |
| 6552 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 6553 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Oct 2025 |
| 6554 | Corley G R | | Oil & Gas Operator | Jun 2009 |
| 6555 | Corley Production Company | Wilson, OK 73463-7218 | Oil Operator | Jun 2025 |
| 6556 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |
| 6557 | Corley, Henry Oil Properties LLC | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 6558 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 6559 | Cornelius Dale | Willow, OK 73673 | Oil Operator | Jun 2025 |
| 6560 | Cornelius Oil Company | Kellyville, OK 74039-0459 | Oil & Gas Operator | Jul 2015 |
| 6561 | Cornelius Oil Inc | Kellyville, OK 74039 | Oil & Gas Operator | Jul 2025 |
| 6562 | Cornelius Petroleum Inc | | Oil & Gas Operator | Jul 2025 |
| 6563 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 6564 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | Apr 2025 |
| 6565 | Cornelius, Steven L | | Oil Operator | Sep 2015 |
| 6566 | Cornell Glen R | Pauls Valley, OK 73075-9606 | Oil & Gas Operator | Oct 2013 |
| 6567 | Cornell Oil Company | | Oil & Gas Operator | May 1985 |
| 6568 | Cornell Rich M - | | Oil & Gas Operator | May 1993 |
| 6569 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 6570 | Corner Operating Company, Inc | New York, NY 10165 | Oil & Gas Operator | Dec 1999 |
| 6571 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 6572 | Cornerstone Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2011 |
| 6573 | Cornerstone Energy, LLC | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 6574 | Cornerstone Gas Processing Inc | | Oil Operator | Jan 1999 |
| 6575 | Cornerstone Minerals LTD | | Oil & Gas Operator | Dec 2009 |
| 6576 | Cornerstone Mining, LLC | | Gas Operator | Sep 2019 |
| 6577 | Cornerstone Natural Gas Co. | | Oil Operator | Oct 1999 |
| 6578 | Cornerstone Natural Resources LLC | Denver, CO 80234 | Oil & Gas Operator | Aug 2025 |
| 6579 | Cornerstone Oil Trust | San Antonio, TX 78251 | Oil & Gas Operator | Jul 2003 |
| 6580 | Cornie Creek Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 6581 | Corning Oil Co Inc | Sonora, OH 43785 | Oil & Gas Operator | Dec 2002 |
| 6582 | Cornwell Well Service, Inc. | | Oil & Gas Operator | Feb 2010 |
| 6583 | Cornwell, G. G. | | Oil & Gas Operator | Sep 2009 |
| 6584 | Corona Development Co. Inc. | | Oil Operator | Dec 1989 |
| 6585 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 6586 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Oct 2025 |
| 6587 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 6588 | Coronado Energy Partners LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 6589 | Coronado Great Plains LLC | Tulsa, OK 74137-2832 | Gas Operator | Apr 2013 |
| 6590 | Coronado Kansas, LLC | Tulsa, OK 74133 | Oil Operator | Oct 2009 |
| 6591 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 6592 | Coronado Oil | Lindsborg, KS 67456 | Oil Operator | Sep 1985 |
| 6593 | Coronado Oil & G | | Oil Operator | Dec 1996 |
| 6594 | Coronado Oil & Gas, Inc. | Great Bend, KS 67530 | Oil Operator | Jul 2004 |
| 6595 | Coronado Oil & Minerals Co. | | Oil & Gas Operator | Sep 1980 |
| 6596 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 6597 | Coronado Oil, Inc. | Salina, KS 67401 | Oil Operator | May 1990 |
| 6598 | Coronado Oklahoma LLC | Tulsa, OK 74133-7036 | Gas Operator | Apr 2020 |
| 6599 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Jul 2025 |
| 6600 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |