| 6501 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 6502 | Cook Operating C | | Oil Operator | May 1987 |
| 6503 | Cook Production LLC | | Oil Operator | Jan 2025 |
| 6504 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 6505 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 6506 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 6507 | Cook, James A. | Augusta, KS 67010 | Oil Operator | Jul 1997 |
| 6508 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | May 2025 |
| 6509 | Cook, Lee J. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 6510 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | May 2025 |
| 6511 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 6512 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 6513 | Cooke, Donald E./Lee Wanda | Coffeyville, KS 67331 | Oil Operator | Dec 2001 |
| 6514 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 6515 | Cool Spring Colony, Inc. | Rudyard, MT 59540 | Gas Operator | Mar 2025 |
| 6516 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 6517 | Coolidge, Paul | | Oil Operator | Feb 2025 |
| 6518 | Coolidge, Timothy J & Billiette Nebel | Kevin, MT 59454 | Oil Operator | Feb 2025 |
| 6519 | Coolspring Gas & Oil Co LLC | Coolspring, PA 15730-8524 | Gas Operator | Dec 2024 |
| 6520 | Coomer, Mitchell | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 6521 | Coon Creek Gas Inc | | Oil & Gas Operator | Mar 2014 |
| 6522 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 6523 | Cooper & Brain Inc. | | Oil & Gas Operator | Mar 2025 |
| 6524 | Cooper A L & Mae C | | Oil & Gas Operator | Jan 2001 |
| 6525 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 6526 | Cooper John T | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 6527 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 6528 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 6529 | Cooper Oil & Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2010 |
| 6530 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 6531 | Cooper Oil Company | Andover, KS 67002 | Oil Operator | Oct 1997 |
| 6532 | Cooper Oil Inc | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 6533 | Cooper Operating | Olney, TX 76374 | Oil Operator | Apr 2007 |
| 6534 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2025 |
| 6535 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 6536 | Cooper Service Co. | | Oil & Gas Operator | Nov 2024 |
| 6537 | Cooper, Glenn W. Oil & Gas | Seymour, TX 76380 | Oil & Gas Operator | Feb 2000 |
| 6538 | Cooper, J. M. | Winfield, KS 67119 | Oil Operator | Oct 1997 |
| 6539 | Cooper, Lowell E. | Peabody, KS 66866 | Oil Operator | Nov 1987 |
| 6540 | Coors Energy | Golden, CO 80402-0467 | Oil & Gas Operator | Sep 1992 |
| 6541 | Coots, Jesse | Le Roy, NY 14482 | Gas Operator | Dec 2023 |
| 6542 | Copano Company | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 6543 | Copano Gas Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 6544 | Cope Oil Company | Valley VIew, TX 76272 | Oil & Gas Operator | Feb 2015 |
| 6545 | Copeland Gas LLC | Albion, PA 16401 | Gas Operator | Dec 2024 |
| 6546 | Copestone Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 6547 | Copper Land Resources LLC | | Oil Operator | Mar 2025 |
| 6548 | Copper Ridge Oil Inc | Olean, NY 14760 | Oil & Gas Operator | Dec 2023 |
| 6549 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 6550 | Copperhead Creek Enterprises, Inc. | Chautauqua, KS 67334 | Oil Operator | Sep 2019 |
| 6551 | Copperhead Enterprises LLC | Ludlow, PA 16333-0057 | Oil & Gas Operator | Dec 2024 |
| 6552 | Copperhead Oil | Colony, KS 66015 | Oil Operator | Sep 1985 |
| 6553 | Copperhead Oil & Gas, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2017 |
| 6554 | Coppertop | San Angelo, TX 76904 | Oil & Gas Operator | May 2025 |
| 6555 | Coppock Herb Energy | Fairview, OK 73737-1037 | Oil & Gas Operator | May 2018 |
| 6556 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 6557 | Coral Coast Petroleum, L.C. | Wichita, KS 67226 | Oil & Gas Operator | Nov 2019 |
| 6558 | Coral E&P, LLC | Adkins, TX 78101 | Oil & Gas Operator | May 2025 |
| 6559 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Feb 2025 |
| 6560 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 6561 | Corbell, W. D. | Dublin, TX 76446 | Oil & Gas Operator | Dec 2001 |
| 6562 | Corda Corporation | Wichita Falls, TX 76302 | Oil & Gas Operator | May 2025 |
| 6563 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | May 2025 |
| 6564 | Cordero Energy Operating LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2020 |
| 6565 | Cordero Mining Co | Gillette, WY 82717 | Oil Operator | Nov 2009 |
| 6566 | Cordero Oil And Gas LLC | Gillette, WY 82716 | Oil Operator | Nov 2021 |
| 6567 | Cordex Petroleums, Inc. | | Oil & Gas Operator | Jun 1996 |
| 6568 | Cordillera Corporation | Denver, CO 80237 | Oil & Gas Operator | Feb 1996 |
| 6569 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Feb 2025 |
| 6570 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 6571 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 6572 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 6573 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 6574 | Core Appalachia Operating LLC | Charleston, WV 25362 | Oil & Gas Operator | Dec 2023 |
| 6575 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 6576 | Core Energy LLC | | Oil & Gas Operator | Mar 2025 |
| 6577 | Core Minerals Operating Co Inc | | Oil & Gas Operator | Dec 2023 |
| 6578 | Core Petro, LLC | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 6579 | Core S&S LLC | Thayer, KS 66776 | Oil Operator | Dec 2024 |
| 6580 | Core Solutions LLC | | Oil & Gas Operator | Dec 2021 |
| 6581 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | May 2025 |
| 6582 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | May 2025 |
| 6583 | Corfu Darien Properties, LLC | Corfu, NY 14036 | Gas Operator | Dec 2023 |
| 6584 | Corgray Holdings, LLC | Fulshear, TX 77441 | Gas Operator | Mar 2016 |
| 6585 | Corie Oil Co., Inc. | Russell, KS 67665 | Oil Operator | Feb 2003 |
| 6586 | Corie Oil Compan | | Oil Operator | Jul 1985 |
| 6587 | Corinne Grace | Carlsbad, NM 88220 | Oil & Gas Operator | Jan 2011 |
| 6588 | Corinthian Exploration (USA) Corp | | Oil & Gas Operator | Apr 2016 |
| 6589 | Cork Petroleum Corporation | Thermopolis, WY 82443 | Oil & Gas Operator | Apr 2012 |
| 6590 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 6591 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | May 2025 |
| 6592 | Corley G R | | Oil & Gas Operator | Jun 2009 |
| 6593 | Corley Production Company | Wilson, OK 73463-7218 | Oil Operator | Mar 2025 |
| 6594 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |
| 6595 | Corley, Henry Oil Properties LLC | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 6596 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 6597 | Cornelius Dale | Willow, OK 73673 | Oil Operator | Jan 2025 |
| 6598 | Cornelius Oil Company | Kellyville, OK 74039-0459 | Oil & Gas Operator | Jul 2015 |
| 6599 | Cornelius Oil Inc | Kellyville, OK 74039 | Oil & Gas Operator | Feb 2025 |
| 6600 | Cornelius Petroleum Inc | | Oil & Gas Operator | Feb 2025 |