| 701 | Cadillac Operating Company, LLC | | Oil Operator | Jan 2025 |
| 702 | Cairn Energy Partners, LLC | | Oil & Gas Operator | Feb 2023 |
| 703 | Cajun Minerals, Inc. | | Oil & Gas Operator | Mar 1997 |
| 704 | Cajun Operating, Inc. | | Oil & Gas Operator | Jun 2011 |
| 705 | Cala Oil & Gas | | Oil & Gas Operator | Oct 1997 |
| 706 | Calais Oil & Gas, L.L.C. | | Oil Operator | Dec 2024 |
| 707 | Caldwell & Self | | Oil Operator | Dec 2024 |
| 708 | Caldwell & Trahan | | Oil Operator | Dec 2024 |
| 709 | Caldwell Oil Company | | Oil Operator | Jul 2012 |
| 710 | Caldwell Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 711 | Caldwell Production | | Oil Operator | Dec 2024 |
| 712 | Caldwell-Bayou State | | Oil Operator | Dec 2024 |
| 713 | California Time Petroleum, Inc | | Oil Operator | Mar 1986 |
| 714 | Callon Offshore Production, Inc. | Natchez, MS 39121 | Oil & Gas Operator | Dec 2005 |
| 715 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 716 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 717 | Calpetco III-Teel 77 A | | Gas Operator | May 1980 |
| 718 | Calpetco-Herbst Expl. Inc. | | Gas Operator | Jan 1990 |
| 719 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 720 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 721 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 722 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 723 | Calumet Lubricants Company | | Oil Operator | Dec 1993 |
| 724 | Calumet Refining Co. | | Oil Operator | May 1991 |
| 725 | Calyx Exploration & Production | | Oil & Gas Operator | Jul 1991 |
| 726 | Camar Exploration | | Oil Operator | Jan 1989 |
| 727 | Cambridge Energy Corporation | | Oil & Gas Operator | Jul 2003 |
| 728 | Camco Resources, Inc. | | Oil Operator | Aug 1991 |
| 729 | Cameron Development Co., Inc. | | Oil & Gas Operator | Mar 1988 |
| 730 | Cameron LNG, LLC | | Oil Operator | Jan 2025 |
| 731 | Camex Operating Company | | Oil & Gas Operator | Dec 2024 |
| 732 | Camex, Inc. | | Oil & Gas Operator | Jun 1992 |
| 733 | Campbell & Assoc.-Ring | | Oil Operator | Nov 1980 |
| 734 | Campbell & Associates | | Oil & Gas Operator | Aug 1987 |
| 735 | Campbell Energy Corporation | | Oil & Gas Operator | May 1992 |
| 736 | Campbell Wells Corporation | | Oil Operator | Dec 1995 |
| 737 | Campground Corporation | | Oil Operator | Nov 2023 |
| 738 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Feb 2026 |
| 739 | Can Do Enterprises | | Oil Operator | Dec 2024 |
| 740 | Canada Crown Inv Corporation | | Oil & Gas Operator | Apr 1998 |
| 741 | Candice Venture #1 | | Oil & Gas Operator | May 1992 |
| 742 | Candleridge Oil, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2003 |
| 743 | Cankton Oil Company | | Oil Operator | May 1985 |
| 744 | Canlan Oil Company | | Oil & Gas Operator | Mar 1992 |
| 745 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Feb 2026 |
| 746 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 747 | Cantium, LLC | | Oil & Gas Operator | Dec 2024 |
| 748 | Cap Production | | Oil Operator | Dec 2024 |
| 749 | Capital Gas, Inc. | | Gas Operator | Jan 1998 |
| 750 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Feb 2026 |
| 751 | Car-Tex Producing Company | | Oil & Gas Operator | Dec 1994 |
| 752 | Carder Oil Company | | Oil & Gas Operator | Dec 2024 |
| 753 | Cardinal Expl And Prod | | Oil & Gas Operator | May 2019 |
| 754 | Cardinal Oil & Gas, Inc. | | Oil & Gas Operator | Jun 1995 |
| 755 | Cardinal Operating Corporation | Waxahachie, TX 75165 | Oil & Gas Operator | Jan 1997 |
| 756 | Cardinal Petroleum Corp Of La | | Oil Operator | May 2003 |
| 757 | Cardneaux Inc | | Oil & Gas Operator | Aug 2009 |
| 758 | Cargas Operating Company | | Oil & Gas Operator | Dec 2024 |
| 759 | Caribbean Oil & Gas Corp | | Oil & Gas Operator | Mar 1980 |
| 760 | Caribe Resources, Inc. | | Oil & Gas Operator | Jan 1985 |
| 761 | Carl E. Hansford | | Oil Operator | Oct 1980 |
| 762 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 763 | Carl Oil & Gas Co.-CNG | | Oil & Gas Operator | Dec 1995 |
| 764 | Carl P. Roppolo, Jr. | | Oil & Gas Operator | Mar 1991 |
| 765 | Carl W Jones Et Al | | Oil & Gas Operator | Jul 1995 |
| 766 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 767 | Carmel Petroleum | | Gas Operator | Dec 1990 |
| 768 | Carmet Oil, Inc. | | Oil & Gas Operator | Dec 1990 |
| 769 | Caroline Hunt Schoellkopf | | Oil & Gas Operator | Aug 1987 |
| 770 | Caroline Hunt Trust Estate | | Oil & Gas Operator | Mar 1987 |
| 771 | Carr Petroleum, Inc. | | Oil Operator | Apr 1987 |
| 772 | Carraway Co. | | Oil Operator | Apr 2006 |
| 773 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 774 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 775 | Carter & Rorex | | Oil Operator | Dec 1991 |
| 776 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 777 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 778 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 779 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 780 | Cashco Energy Corporation | | Oil & Gas Operator | Feb 1982 |
| 781 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 782 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 783 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 784 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 785 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 786 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 787 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 788 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 789 | Castor Production, L.L.C. | | Oil Operator | Dec 2024 |
| 790 | Cat-Oil Inc. | | Oil Operator | Nov 2015 |
| 791 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 792 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 793 | Catlett & Ferguson-Carl O & G | | Oil & Gas Operator | Jun 1978 |
| 794 | Cavalcade Operating Company LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2017 |
| 795 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 796 | Cavenham Energy Resources Inc. | | Oil & Gas Operator | Apr 1991 |
| 797 | Cavenham Energy Resrces Inc JV | | Oil Operator | Mar 1991 |
| 798 | Cavenham Forest Ind., Inc. | | Oil & Gas Operator | Nov 1987 |
| 799 | Cavenham Forest Ind., Inc. J V | | Oil Operator | Nov 1987 |
| 800 | Cayman Exploration Corp | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |