| 2701 | Crystal Exploration Co | | Oil & Gas Operator | Dec 2009 |
| 2702 | Crystal Gas, L.L.C. | | Oil & Gas Operator | Apr 2000 |
| 2703 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 2704 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 2705 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 2706 | Csa Exploration Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Aug 2003 |
| 2707 | Csapo Limited | Creston, OH 44217 | Oil & Gas Operator | Dec 2012 |
| 2708 | CSC Energy Corp. | | Oil & Gas Operator | Dec 2009 |
| 2709 | CSC, Inc. | | Oil Operator | Jan 2000 |
| 2710 | CSD IV Oil LLC | Columbus, OH 43209 | Oil Operator | Dec 2024 |
| 2711 | CSL Exploration, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2018 |
| 2712 | CSM, Inc. | | Gas Operator | Oct 1990 |
| 2713 | Cso Consulting | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2020 |
| 2714 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 2715 | CSV Holdings, Inc. | | Oil & Gas Operator | Dec 2014 |
| 2716 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 2717 | CT Adams Jr., LLC | Schulenburg, TX 78956 | Oil Operator | Dec 2025 |
| 2718 | CTC Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 2719 | Cti Associates | | Gas Operator | Jan 1990 |
| 2720 | CTL Oil & Gas Corporation | Buchanan Dam, TX 78609 | Oil & Gas Operator | Nov 2020 |
| 2721 | CTL Production, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 2722 | CTR 247 LLC | Peru, KS 67360 | Oil Operator | Jul 2025 |
| 2723 | CTR Petroleum, Inc. | Corpus Chrsti, TX 78414 | Oil & Gas Operator | Mar 2015 |
| 2724 | CTX Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 2725 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Dec 2025 |
| 2726 | Cuatro Petro Corp. | Richardson, TX 75080 | Oil & Gas Operator | Dec 2025 |
| 2727 | Cub Creek Energy LLC | | Oil & Gas Operator | Mar 2019 |
| 2728 | Cuba, John H. | Olney, TX 76374 | Oil Operator | Dec 2025 |
| 2729 | Cucharas Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 2730 | Cudd Operating Corp | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 2731 | Cuervo Resources, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Oct 1996 |
| 2732 | Cuervo, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Dec 2025 |
| 2733 | Cuesta Petroleum Inc | Shawnee, OK 74801-6963 | Oil & Gas Operator | Oct 2025 |
| 2734 | Culbreath Oil & Gas Co Inc | Tulsa, OK 74135 | Oil & Gas Operator | Nov 2025 |
| 2735 | Culebra Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 2736 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Dec 2025 |
| 2737 | Cullen Corporati | | Oil & Gas Operator | Jan 1993 |
| 2738 | Cullison, Jimmie I. | Moscow, KS 67952 | Oil Operator | Apr 2002 |
| 2739 | Culoco, Inc. | Dallas, TX 75374 | Oil & Gas Operator | Nov 2024 |
| 2740 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Aug 2025 |
| 2741 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 2742 | Culver & Grounds | | Oil & Gas Operator | Nov 1995 |
| 2743 | Culver & Grounds Oil Properties, Inc. | McPherson, KS 67460 | Oil Operator | Sep 2025 |
| 2744 | Cumberland Exploration | Cleveland, OH 44111 | Oil & Gas Operator | Dec 1985 |
| 2745 | Cumberland Gas Co.(Tree Preservation Co) | | Oil & Gas Operator | Dec 1996 |
| 2746 | Cumberland Harlan Expl Corp | Barbourville, KY 40906 | Oil & Gas Operator | Dec 2023 |
| 2747 | Cumberland Operating Company | Seminole, OK 74868-1258 | Oil & Gas Operator | Mar 2007 |
| 2748 | Cumberland Operating LLC | Cody, WY 82414 | Oil & Gas Operator | Oct 2025 |
| 2749 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 2750 | Cumberland River Oil & Gas, Inc | Williamsburg, KY 40769 | Oil & Gas Operator | Dec 2023 |
| 2751 | Cumberland Valley Resources, LLC | Louisville, KY 40204 | Oil & Gas Operator | Dec 2023 |
| 2752 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2025 |
| 2753 | Cummings Gene | | Oil Operator | Dec 2000 |
| 2754 | Cummings Oil & Cattle | Ada, OK 74820-0994 | Oil Operator | Jan 2017 |
| 2755 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Nov 2025 |
| 2756 | Cummings, C. M. Oil & Gas | Lewisville, TX 75029 | Oil & Gas Operator | Nov 1993 |
| 2757 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 2758 | Cummins Wren Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Nov 1998 |
| 2759 | Cundiff Harold | Perkins, OK 74059-4199 | Oil & Gas Operator | Apr 2025 |
| 2760 | Cundiff Jack | Perkins, OK 74059-4198 | Oil & Gas Operator | Apr 2014 |
| 2761 | Cundiff Operating Company | Dallas, TX 75238 | Oil & Gas Operator | Dec 2025 |
| 2762 | Cunningham Crude, A General Partnership | Independence, KS 67301 | Oil Operator | Sep 2025 |
| 2763 | Cunningham Energy LLC | Charleston, WV 25302 | Oil & Gas Operator | Dec 2021 |
| 2764 | Cunningham, Melvin | Medicine Lodge, KS 67104 | Oil Operator | Jan 2013 |
| 2765 | Cur-Ric Petrol & Gas Corp | Las Vegas, NV 89120-4003 | Oil Operator | Dec 1985 |
| 2766 | Curmar Producers | Adairsville, GA 30103 | Oil Operator | Mar 2008 |
| 2767 | Curn Lisa | Steubenville, OH 43952-2535 | Oil Operator | Oct 2025 |
| 2768 | Curran Oil Co | Great Falls, MT 59401 | Gas Operator | May 2001 |
| 2769 | Currie Cattle Co. | Big Spring, TX 79720 | Oil & Gas Operator | Sep 2007 |
| 2770 | Currie, V. Monta, Jr. | | Gas Operator | Nov 1990 |
| 2771 | Curry Oil | | Oil Operator | May 2005 |
| 2772 | Curry R D Production Co | Memphis, TN 38103 | Oil & Gas Operator | Dec 1986 |
| 2773 | Curry, Gregg | Madison, KS 66860 | Oil Operator | Sep 2025 |
| 2774 | Curt Weaver Et Al | | Oil Operator | Apr 1982 |
| 2775 | Curt'S Oil Opera | | Oil Operator | Nov 1994 |
| 2776 | Curt'S Oil Operation, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Sep 2025 |
| 2777 | Curtis & Son Oil Inc | Sugar Grove, PA 16350 | Oil & Gas Operator | Dec 2024 |
| 2778 | Curtis Beard & Huston P. Ganey | | Oil Operator | Mar 1987 |
| 2779 | Curtis F. Adams | | Oil & Gas Operator | Oct 2024 |
| 2780 | Curtis Hankamer | Houston, TX 77024 | Oil & Gas Operator | Jun 1997 |
| 2781 | Curtis J Little | Farmington, NM 87499 | Oil & Gas Operator | Aug 2005 |
| 2782 | Curtis Oil Inc | Duke Center, PA 16729-0287 | Oil & Gas Operator | Dec 2024 |
| 2783 | Curzac Oil And Gas, LLC | Plano, TX 75075 | Oil & Gas Operator | Dec 2025 |
| 2784 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Oct 2025 |
| 2785 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 2786 | Custer K. Primos | | Oil & Gas Operator | Oct 2002 |
| 2787 | Custom Oil Explo | | Oil & Gas Operator | May 1992 |
| 2788 | Custom Service LLC | St John, KS 67576 | Oil Operator | Sep 2025 |
| 2789 | Cut Bank Gas Company | Cut Bank, MT 59427 | Gas Operator | May 2025 |
| 2790 | Cut Through Hydrocarbon | Florence, KY 41042 | Gas Operator | Dec 2019 |
| 2791 | Cutbow Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 2792 | Cutler Oil, LLC | Rantoul, KS 66079 | Oil Operator | Sep 2025 |
| 2793 | Cutter Exploration Inc | Oviedo, FL 32765 | Oil & Gas Operator | Dec 2024 |
| 2794 | Cutter Oil Company | West Salem, OH 44287 | Oil & Gas Operator | Dec 2018 |
| 2795 | Cutter Oil LLC | West Salem, OH 44287 | Oil & Gas Operator | Dec 2024 |
| 2796 | Cuyahoga Expl & Develop | Marietta, OH 45750 | Oil & Gas Operator | Dec 1986 |
| 2797 | Cuyahoga Expl. & Devel. Corp. | Jericho, NY 11753 | Oil & Gas Operator | Dec 1996 |
| 2798 | CVR Supply & Trading, LLC | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 2799 | CVS Operating, LLC. | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 2800 | CVS Production, LLC. | Plano, TX 75074 | Oil Operator | Dec 2025 |