| 601 | Caribou Operating Co. | Granbury, TX 76048 | Oil & Gas Operator | Mar 2010 |
| 602 | Caribou Operating, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Feb 2026 |
| 603 | Carken LLC | Andrews, TX 79714 | Oil Operator | Feb 2026 |
| 604 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 605 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 606 | Carl E Smith Petroleum Inc | Dallas, TX 75234-6057 | Oil & Gas Operator | Dec 2019 |
| 607 | Carl E. Hansford | | Oil Operator | Oct 1980 |
| 608 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | Dec 2025 |
| 609 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 610 | Carl Oil & Gas Co.-CNG | | Oil & Gas Operator | Dec 1995 |
| 611 | Carl P. Roppolo, Jr. | | Oil & Gas Operator | Mar 1991 |
| 612 | Carl Schellinger | Roswell,, NM 88201 | Oil & Gas Operator | May 2010 |
| 613 | Carl W Jones Et Al | | Oil & Gas Operator | Jul 1995 |
| 614 | Carl Weaver Properties | | Oil & Gas Operator | Dec 1987 |
| 615 | Carl, William E. | Corpus Christi, TX 78471 | Oil Operator | Jul 1986 |
| 616 | Carla Energy Corporation | Oklahoma City, OK 73154-1487 | Oil & Gas Operator | Nov 2014 |
| 617 | Carless Resources Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1997 |
| 618 | Carlin Oil & Gas | | Oil Operator | Jan 1994 |
| 619 | Carlin Oil And Gas Company | Tulsa, OK 74101-1019 | Oil & Gas Operator | May 1992 |
| 620 | Carlon Oil & Gas Co Inc | Derby, KS 67037 | Gas Operator | Dec 2025 |
| 621 | Carloran Production Corp | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2026 |
| 622 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 623 | Carlson Oil Inc. | | Oil & Gas Operator | Oct 2008 |
| 624 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 625 | Carlton Oil Corp | Newport, OH 45768 | Oil & Gas Operator | Dec 2013 |
| 626 | Carlton, Richard L | | Oil & Gas Operator | Aug 1999 |
| 627 | Carlton, Wayne Inc. | Bronte, TX 76933 | Oil & Gas Operator | Dec 2002 |
| 628 | Carmac Energy Company LLC | Shawnee, OK 74804 | Oil Operator | Nov 2025 |
| 629 | Carmac Energy Corporation | Dallas, TX 75219-2311 | Oil & Gas Operator | Nov 2025 |
| 630 | Carman C Wilford | | Oil & Gas Operator | Jan 2007 |
| 631 | Carman Frances J | Pawhuska, OK 74056-0101 | Oil & Gas Operator | Aug 2013 |
| 632 | Carman Robert W | Bristow, OK 74010-3454 | Oil & Gas Operator | Nov 2025 |
| 633 | Carmel Energy, Inc. | | Oil Operator | Dec 2009 |
| 634 | Carmel Petroleum | | Gas Operator | Dec 1990 |
| 635 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 636 | Carmen Schmitt, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Sep 2025 |
| 637 | Carmet Oil, Inc. | | Oil & Gas Operator | Dec 1990 |
| 638 | Carmichael Oil & Gas Company | Vallejo, CA 94591-5653 | Oil & Gas Operator | Apr 2014 |
| 639 | Carnegie Natural Gas Co | Pittsburgh, PA 15236-1435 | Gas Operator | Dec 1991 |
| 640 | Carnegie Production Co | Charleston, WV 25328 | Oil & Gas Operator | Dec 2017 |
| 641 | Carneros Energy Inc. | | Oil & Gas Operator | Dec 2004 |
| 642 | Carnes Crude Oil Reclaiming Industry | | Oil Operator | Dec 2019 |
| 643 | Carnes Petroleum Corporation | Cleveland, OK 74020 | Oil & Gas Operator | May 2020 |
| 644 | Carney A B | | Oil & Gas Operator | Jan 2014 |
| 645 | Carney Mark C & Karen M | Dallas, TX 75206-4010 | Oil & Gas Operator | Oct 1994 |
| 646 | Caroden Energy LLC | Wake Forest, NC 27587 | Oil Operator | Sep 2025 |
| 647 | Caroil, LLC | Odessa, TX 79761 | Oil Operator | Feb 2026 |
| 648 | Carol Rhodabarger Heitz | | Oil & Gas Operator | Dec 1996 |
| 649 | Carol S Pultorak & Ra A Pultorak | Waynesburg, PA 15370-2434 | Gas Operator | Dec 2018 |
| 650 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Dec 2025 |
| 651 | Caroline Hunt Schoellkopf | | Oil & Gas Operator | Aug 1987 |
| 652 | Caroline Hunt Trust Estate | | Oil & Gas Operator | Mar 1987 |
| 653 | Carolla And Hay | | Gas Operator | Aug 1983 |
| 654 | Carolynn Clark Wiggin Oil Properties | Farmington, NM 874990420 | Oil & Gas Operator | Sep 2011 |
| 655 | Carotex Energy, Inc. | Wilson, NC 27893 | Oil & Gas Operator | Aug 2003 |
| 656 | Carpco Efficient Energy Co., LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 657 | Carpenter Corporation | Sourlake, TX 77659 | Oil & Gas Operator | Oct 1994 |
| 658 | Carpenter Luther | Skiatook, OK 74070-9124 | Oil & Gas Operator | Oct 2025 |
| 659 | Carpenter R L | Sapulpa, OK 74067-0452 | Oil Operator | Mar 2007 |
| 660 | Carpenter Services | Colorado City, TX 79512 | Oil & Gas Operator | May 1996 |
| 661 | Carper Ruth A& Henthorn Jr W D | Pataskala, OH 43062 | Oil & Gas Operator | Dec 2024 |
| 662 | Carper Well Service Inc. | Reno, OH 45773 | Oil & Gas Operator | Dec 2023 |
| 663 | Carr Exploration | | Oil & Gas Operator | Sep 1993 |
| 664 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 665 | Carr Petroleum, Inc. | | Oil Operator | Apr 1987 |
| 666 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2026 |
| 667 | Carr Well Service Inc | Odessa, TX 79769 | Oil & Gas Operator | Nov 1996 |
| 668 | Carr, Robert Alan | | Gas Operator | Dec 2021 |
| 669 | Carraway Co. | | Oil Operator | Apr 2006 |
| 670 | Carrell Oil Company Dba Coco | Laurel, MT 59044 | Oil Operator | Jul 2020 |
| 671 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Nov 2025 |
| 672 | Carrie Exploration & Development, LLC | Hays, KS 67601 | Oil & Gas Operator | Dec 2019 |
| 673 | Carriero, Pamela A. | Angola, NY 14006 | Gas Operator | Dec 2024 |
| 674 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 675 | Carrizo (Marcellus) LLC | Houston, TX 77002-5018 | Gas Operator | Jun 2019 |
| 676 | Carrizo (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 677 | Carrizo (Utica) LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 678 | Carrizo Exploration, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2016 |
| 679 | Carrizo Niobrara LLC | | Oil & Gas Operator | Jun 2017 |
| 680 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 681 | Carrland Oil & Gas Inc. | Prosper, TX 75078 | Oil & Gas Operator | Feb 2026 |
| 682 | Carroll Energy, LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Nov 2023 |
| 683 | Carroll M R Dba Carroll Production Company | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2025 |
| 684 | Carroll Oil Prod | | Oil Operator | Jan 1986 |
| 685 | Carroll Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2022 |
| 686 | Carroll Resources | Loudonville, OH 44842 | Oil & Gas Operator | Dec 1998 |
| 687 | Carroll T L Ente | | Gas Operator | Aug 1989 |
| 688 | Carroll, Alvis J. | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 2008 |
| 689 | Carroll, Jon M. | Great Bend, KS 67530 | Oil Operator | Dec 2001 |
| 690 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 691 | Carruth David C Family Trust | Russellville, AR 72811-2061 | Oil Operator | Aug 2002 |
| 692 | Carruth Oil & Gas, LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 693 | Carruth, Chris | Andrews, TX 79714 | Oil & Gas Operator | Nov 2017 |
| 694 | Carson Assoc, Inc | Ashland, KY 41102 | Oil & Gas Operator | Dec 2013 |
| 695 | Carson Buckles Exploration LLC | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2026 |
| 696 | Carson Dominguez Real Est Corp | | Oil & Gas Operator | Dec 1996 |
| 697 | Carstan Petroleu | | Oil Operator | May 1983 |
| 698 | Cart Hill Energy, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Dec 2025 |
| 699 | Carter & Rorex | | Oil Operator | Dec 1991 |
| 700 | Carter Cattle & Crude Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |