| 601 | Carmel Energy, Inc. | | Oil Operator | Dec 2009 |
| 602 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 603 | Carmen Schmitt, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Apr 2026 |
| 604 | Carmet Oil, Inc. | | Oil & Gas Operator | Dec 1990 |
| 605 | Carmichael Oil & Gas Company | Vallejo, CA 94591-5653 | Oil & Gas Operator | Apr 2014 |
| 606 | Carnegie Natural Gas Co | Pittsburgh, PA 15236-1435 | Gas Operator | Dec 1991 |
| 607 | Carnegie Production Co | Charleston, WV 25328 | Oil & Gas Operator | Dec 2017 |
| 608 | Carneros Energy Inc. | | Oil & Gas Operator | Dec 2004 |
| 609 | Carnes Crude Oil Reclaiming Industry | | Oil Operator | Dec 2019 |
| 610 | Carnes Oil LLC | Russell Springs, KY 42642 | Oil Operator | Dec 2020 |
| 611 | Carnes Petroleum Corporation | Cleveland, OK 74020 | Oil & Gas Operator | May 2020 |
| 612 | Carney Mark C & Karen M | Dallas, TX 75206-4010 | Oil & Gas Operator | Oct 1994 |
| 613 | Caroden Energy LLC | Wake Forest, NC 27587 | Oil Operator | Apr 2026 |
| 614 | Caroil, LLC | Odessa, TX 79761 | Oil Operator | Sep 2026 |
| 615 | Carol Rhodabarger Heitz | | Oil & Gas Operator | Dec 1996 |
| 616 | Carol S Pultorak & Ra A Pultorak | Waynesburg, PA 15370-2434 | Gas Operator | Dec 2018 |
| 617 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Jul 2026 |
| 618 | Caroline Hunt Schoellkopf | | Oil & Gas Operator | Aug 1987 |
| 619 | Caroline Hunt Trust Estate | | Oil & Gas Operator | Mar 1987 |
| 620 | Carolynn Clark Wiggin Oil Properties | Farmington, NM 874990420 | Oil & Gas Operator | Sep 2011 |
| 621 | Carotex Energy, Inc. | Wilson, NC 27893 | Oil & Gas Operator | Aug 2003 |
| 622 | Carpco Efficient Energy Co., LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 623 | Carpenter Corporation | Sourlake, TX 77659 | Oil & Gas Operator | Oct 1994 |
| 624 | Carpenter Luther | Skiatook, OK 74070-9124 | Oil & Gas Operator | May 2026 |
| 625 | Carpenter R L | Sapulpa, OK 74067-0452 | Oil Operator | Mar 2007 |
| 626 | Carpenter Services | Colorado City, TX 79512 | Oil & Gas Operator | May 1996 |
| 627 | Carper Ruth A& Henthorn Jr W D | Pataskala, OH 43062 | Oil & Gas Operator | Dec 2025 |
| 628 | Carper Well Service Inc. | Reno, OH 45773 | Oil & Gas Operator | Dec 2025 |
| 629 | Carr Exploration | | Oil & Gas Operator | Sep 1993 |
| 630 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 631 | Carr Petroleum, Inc. | | Oil Operator | Apr 1987 |
| 632 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2026 |
| 633 | Carr Well Service Inc | Midland, TX 79702 | Oil & Gas Operator | Nov 1996 |
| 634 | Carraway Co. | | Oil Operator | Apr 2006 |
| 635 | Carrell Oil Company Dba Coco | Laurel, MT 59044 | Oil Operator | Jul 2020 |
| 636 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | May 2026 |
| 637 | Carrie Exploration & Development, LLC | Hays, KS 67601 | Oil & Gas Operator | Dec 2019 |
| 638 | Carriero, Pamela A. | Angola, NY 14006 | Gas Operator | Dec 2025 |
| 639 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 640 | Carrizo (Marcellus) LLC | Houston, TX 77002-5018 | Gas Operator | Jun 2019 |
| 641 | Carrizo (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 642 | Carrizo (Utica) LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 643 | Carrizo Exploration, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2016 |
| 644 | Carrizo Niobrara LLC | | Oil & Gas Operator | Jun 2017 |
| 645 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 646 | Carrland Oil & Gas Inc. | Prosper, TX 75078 | Oil & Gas Operator | Sep 2026 |
| 647 | Carroll Energy, LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Nov 2023 |
| 648 | Carroll M R Dba Carroll Production Company | Tulsa, OK 74112 | Oil & Gas Operator | Jun 2026 |
| 649 | Carroll Oil Prod | | Oil Operator | Jan 1986 |
| 650 | Carroll Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2022 |
| 651 | Carroll Resources | Loudonville, OH 44842 | Oil & Gas Operator | Dec 1998 |
| 652 | Carroll T L Ente | | Gas Operator | Aug 1989 |
| 653 | Carroll, Alvis J. | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 2008 |
| 654 | Carroll, Jon M. | Great Bend, KS 67530 | Oil Operator | Dec 2001 |
| 655 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 656 | Carruth David C Family Trust | Russellville, AR 72811-2061 | Oil Operator | Aug 2002 |
| 657 | Carruth Oil & Gas, LLC | Andrews, TX 79714 | Oil & Gas Operator | Sep 2026 |
| 658 | Carruth, Chris | Andrews, TX 79714 | Oil & Gas Operator | Nov 2017 |
| 659 | Carson Assoc, Inc | Ashland, KY 41102 | Oil & Gas Operator | Dec 2013 |
| 660 | Carson Buckles Exploration LLC | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2026 |
| 661 | Carson Dominguez Real Est Corp | | Oil & Gas Operator | Dec 1996 |
| 662 | Carstan Petroleu | | Oil Operator | May 1983 |
| 663 | Cart Hill Energy, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Apr 2026 |
| 664 | Carter & Rorex | | Oil Operator | Dec 1991 |
| 665 | Carter Cattle & Crude Company | Luling, TX 78648 | Oil & Gas Operator | Sep 2026 |
| 666 | Carter County Salt Water Disposal Inc | Wilson, OK 73463 | Oil Operator | Apr 2026 |
| 667 | Carter Donald L | Sand Springs, OK 74063-8105 | Oil Operator | May 2006 |
| 668 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 669 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 670 | Carter Exploration Company | Corpus Christ, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 671 | Carter Oil And Gas Inc | Richmond, VA 23219 | Oil & Gas Operator | Dec 2011 |
| 672 | Carter Oil Co | | Oil & Gas Operator | Dec 2013 |
| 673 | Carter Preston Drilling Co | Davis, OK 73030 | Gas Operator | Nov 2000 |
| 674 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 675 | Carter, Calvin Gene | Sedan, KS 67361 | Oil Operator | Nov 2018 |
| 676 | Carter, Eugene J. | Longton, KS 67352 | Oil Operator | Jan 1998 |
| 677 | Carter, Gertrude (Trudy) | Rockwall, TX 75032 | Oil & Gas Operator | Apr 2013 |
| 678 | Carter, Mattye Family Trust | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2002 |
| 679 | Carter, Mattye L., Estate Of | Gladewater, TX 75647 | Oil & Gas Operator | Feb 1995 |
| 680 | Carter, Shirley Oil Co | Round Rock, TX 78665 | Oil & Gas Operator | Jun 2018 |
| 681 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Sep 2026 |
| 682 | Carter-Waters Corp. | | Oil Operator | Dec 1988 |
| 683 | Cartex Production | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 684 | Cartex Production Corp. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 685 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | Jun 2026 |
| 686 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | May 2026 |
| 687 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 688 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 689 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 690 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Sep 2026 |
| 691 | Casa Grande Exploration Company | Casa Grande, AZ 85194 | Oil & Gas Operator | May 2026 |
| 692 | Casa Operations | Borger, TX 79007 | Oil & Gas Operator | Sep 2026 |
| 693 | Cascade Oil (Dba) | Ness City, KS 67560 | Oil Operator | Mar 1998 |
| 694 | Cascade Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 695 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 696 | Cascade Petroleum Inc | North Canton, OH 44720-4244 | Oil & Gas Operator | Dec 1992 |
| 697 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | Jul 2026 |
| 698 | Case Brothers Inc. | Limestone, NY 14753 | Oil & Gas Operator | Dec 2025 |
| 699 | Case Drilling Company | Philpot, KY 42366 | Oil Operator | Dec 2020 |
| 700 | Case Oil | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |