| 6501 | Conquest Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Aug 2024 |
| 6502 | Conquest Petroleum Inc | | Oil & Gas Operator | Nov 2014 |
| 6503 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | Apr 2025 |
| 6504 | Conrade Patsy | | Oil Operator | Jan 1986 |
| 6505 | Cons Asset MGMT SVCS E&P Op, LLC | Houston, TX 77002 | Oil Operator | Dec 2017 |
| 6506 | Considine, Barry | Burrton, KS 67020 | Gas Operator | Dec 2024 |
| 6507 | Consol Gas Company | Canonsburg, PA 15317 | Oil & Gas Operator | Dec 2021 |
| 6508 | Consol Oil Recvry/Ener Co Inc | Cushing, OK 74023 | Oil Operator | Nov 1993 |
| 6509 | Consolidated Energy Inv., Inc. | | Oil & Gas Operator | Oct 2013 |
| 6510 | Consolidated Energy Res., Inc. | | Oil Operator | Jun 1992 |
| 6511 | Consolidated Engy Reserve Inc | | Oil & Gas Operator | Jul 1991 |
| 6512 | Consolidated Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 6513 | Consolidated Gas & Energy Corp. | San Diego, CA 92130 | Oil Operator | Apr 2012 |
| 6514 | Consolidated Investments | Seminole, OK 74868 | Oil & Gas Operator | Jan 2025 |
| 6515 | Consolidated Natural Res. Corp. | Kilgore, TX 75662 | Oil & Gas Operator | Jan 2016 |
| 6516 | Consolidated Oil | | Oil Operator | Jul 1996 |
| 6517 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 6518 | Consolidated Oil Well Services, Inc | Chanute, KS 66720 | Oil Operator | Jan 2008 |
| 6519 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 6520 | Consolidated Petro PTNRS I, LLC | Austin, TX 78759 | Oil & Gas Operator | Mar 2003 |
| 6521 | Consolidated Petrol Corp | Columbus, OH 43215 | Oil & Gas Operator | Dec 1995 |
| 6522 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 6523 | Consolidated Res Of Amer | Cincinnati, OH 45208 | Oil & Gas Operator | Dec 1996 |
| 6524 | Consolidated Resources Corp | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2014 |
| 6525 | Consolidated Resources Inc | | Oil & Gas Operator | May 2004 |
| 6526 | Consolidation Coal Company | Saint Clairsville, OH 43950-8742 | Oil & Gas Operator | Dec 2020 |
| 6527 | Consortium Energy LLC | Tallmadge, OH 44278 | Oil & Gas Operator | Dec 2024 |
| 6528 | Constitution Gas Transport Co., Inc. | Salt Lake City, UT 84124-1110 | Gas Operator | Jun 2012 |
| 6529 | Constitution Investment Co LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 6530 | Constitution Petroleum | Salt Lake City, UT 84124-1110-1110 | Oil & Gas Operator | Dec 2008 |
| 6531 | Consumers Energy Co | | Oil & Gas Operator | Apr 2010 |
| 6532 | Contango Midstream Company | Houston, TX 77002-3023 | Oil & Gas Operator | Feb 2025 |
| 6533 | Contango Operators, Inc. | Houston, TX 77098 | Oil & Gas Operator | Dec 2022 |
| 6534 | Contango Operators, LLC | | Oil & Gas Operator | Nov 2024 |
| 6535 | Contango Resources Company | | Oil & Gas Operator | Mar 2009 |
| 6536 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 6537 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 6538 | Contango Rocky Mountain Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2020 |
| 6539 | Continental Brok | | Oil Operator | Oct 1994 |
| 6540 | Continental Ener | | Oil & Gas Operator | Dec 1996 |
| 6541 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 6542 | Continental Energy Operating LLC | Tulsa, OK 74114-1302 | Oil & Gas Operator | Feb 2025 |
| 6543 | Continental Expl | | Oil Operator | Sep 1991 |
| 6544 | Continental Exploration, Inc. | | Oil Operator | Dec 2001 |
| 6545 | Continental Exploration, L.L.C. | Lufkin, TX 75915 | Oil & Gas Operator | Apr 2025 |
| 6546 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 6547 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 6548 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 6549 | Continental Natural Gas, Inc. | Tulsa, OK 74121 | Oil & Gas Operator | Jun 2018 |
| 6550 | Continental Oil | | Oil Operator | Jun 1985 |
| 6551 | Continental Oil & Gas Co. Inc. | | Oil & Gas Operator | Jul 1997 |
| 6552 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 6553 | Continental Oil Co. | Durango, CO 81301 | Oil & Gas Operator | Dec 1983 |
| 6554 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 6555 | Continental Petroleum, LLC | | Oil & Gas Operator | Oct 2013 |
| 6556 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 6557 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2025 |
| 6558 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2025 |
| 6559 | Continental U.S. Management Corp | Dallas, TX 75240 | Oil & Gas Operator | Oct 2016 |
| 6560 | Continental-Emsco Co | Hobbs, NM 88241 | Oil & Gas Operator | Jun 1995 |
| 6561 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Apr 2025 |
| 6562 | Continuum Midstream LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2024 |
| 6563 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 6564 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 6565 | Contour Expl And Prod, LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2025 |
| 6566 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 6567 | Contract Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2012 |
| 6568 | Contract Oil & Gas Service Co. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2007 |
| 6569 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 6570 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 6571 | Converse Oil Corp. | | Oil Operator | Dec 2010 |
| 6572 | Convert Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2019 |
| 6573 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 6574 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Apr 2025 |
| 6575 | Cook D L | Holliday, TX 76366 | Oil & Gas Operator | Dec 2008 |
| 6576 | Cook Energy Inc | Cooksburg, PA 16217-0054 | Oil & Gas Operator | Dec 2004 |
| 6577 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | Apr 2025 |
| 6578 | Cook Inlet Energy, LLC. | | Oil & Gas Operator | Mar 2025 |
| 6579 | Cook L D | Bartlesville, OK 74005-2306 | Oil & Gas Operator | Nov 2005 |
| 6580 | Cook Marshall Operating, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 1995 |
| 6581 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 6582 | Cook Operating C | | Oil Operator | May 1987 |
| 6583 | Cook Production LLC | | Oil Operator | Jan 2025 |
| 6584 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 6585 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 6586 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 6587 | Cook, James A. | Augusta, KS 67010 | Oil Operator | Jul 1997 |
| 6588 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | Apr 2025 |
| 6589 | Cook, Lee J. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 6590 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Apr 2025 |
| 6591 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 6592 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 6593 | Cooke, Donald E./Lee Wanda | Coffeyville, KS 67331 | Oil Operator | Dec 2001 |
| 6594 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 6595 | Cool Spring Colony, Inc. | Rudyard, MT 59540 | Gas Operator | Feb 2025 |
| 6596 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 6597 | Coolidge, Paul | | Oil Operator | Feb 2025 |
| 6598 | Coolidge, Tim & Billiette | Sunburst, MT 59482 | Oil Operator | Feb 2025 |
| 6599 | Coolidge, Timothy J & Billiette Nebel | Kevin, MT 59454 | Oil Operator | Feb 2025 |
| 6600 | Coolspring Gas & Oil Co LLC | Coolspring, PA 15730-8524 | Gas Operator | Dec 2024 |