| 5801 | Clifton, B.W. | Graham, TX 76450 | Oil & Gas Operator | Mar 2000 |
| 5802 | Clifton, Joe B. Exploration, Inc | Pauls Valley, OK 73075 | Oil & Gas Operator | Mar 2008 |
| 5803 | Climax Oil Co LLC | Comanche, OK 73529-7715 | Oil Operator | Apr 2026 |
| 5804 | Clinch Drilling Company | | Oil & Gas Operator | Jan 2000 |
| 5805 | Clindco Inc | Bartlesville, OK 74006-6213 | Oil & Gas Operator | Oct 2019 |
| 5806 | Cline Oil Inc | Bradford, PA 16701 | Oil & Gas Operator | Dec 2025 |
| 5807 | Cline Production Company | Billings, MT 59104 | Oil & Gas Operator | Mar 2026 |
| 5808 | Clint H. Woodington | | Oil Operator | Dec 1994 |
| 5809 | Clinton Bowers Estate | Manhatten, KS 66502 | Oil Operator | Dec 1998 |
| 5810 | Clinton Gas Marketing Inc | Columbus, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 5811 | Clinton Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Apr 1980 |
| 5812 | Clinton Petroleum Co Inc | Randolph, OH 44265 | Oil & Gas Operator | Dec 2009 |
| 5813 | Clinton Producti | | Oil Operator | Dec 1989 |
| 5814 | Clinton Production, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Aug 2025 |
| 5815 | Clinton, Orville L., Jr. | Paola, KS 66071 | Oil Operator | Apr 2005 |
| 5816 | Clipper Operating Co., Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 2000 |
| 5817 | CLK Energy Partners, LLC | | Oil & Gas Operator | Aug 2018 |
| 5818 | CLM Oil Production Inc | Bartlesville, OK 74006-4417 | Oil & Gas Operator | Apr 2026 |
| 5819 | CLM Operating | Graham, TX 76450 | Oil & Gas Operator | Aug 2017 |
| 5820 | CLMX Energy LLC | | Oil Operator | Jan 2026 |
| 5821 | Cloer VIrgil R | Oklahoma City, OK 73121 | Oil & Gas Operator | Apr 1993 |
| 5822 | Clofas Case Oil Co. | | Oil & Gas Operator | Dec 2025 |
| 5823 | Close, Bryan H. | Shamrock, TX 79079 | Gas Operator | Jun 2026 |
| 5824 | Clothier, David W. | Eastborough, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 5825 | Cloud Peak Operating LLC | Casper, WY 82601 | Oil Operator | Apr 2026 |
| 5826 | Clovelly DRLG & Dev Co Inc | | Oil & Gas Operator | Oct 1983 |
| 5827 | Clovelly Oil Co. LLC | | Oil & Gas Operator | Nov 2024 |
| 5828 | Clovelly Oil Co., Inc. | | Oil & Gas Operator | Nov 2008 |
| 5829 | Clovelly Oil Co., Inc. - Ripco | | Oil & Gas Operator | Nov 1991 |
| 5830 | Clover Energy Corp | | Oil & Gas Operator | May 1980 |
| 5831 | Clover Oil Company | | Oil Operator | Jan 2026 |
| 5832 | Clover Production Company | Sourlake, TX 77659 | Oil & Gas Operator | Jun 2026 |
| 5833 | Clowser Well Service, Inc. | | Oil & Gas Operator | Dec 2021 |
| 5834 | CLR Gauging Corp. | Tuleta, TX 78162 | Oil & Gas Operator | Jun 2026 |
| 5835 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Jun 2026 |
| 5836 | CLS Interests, Incorporated | Austin, TX 78734 | Oil & Gas Operator | Jan 1997 |
| 5837 | CLS Petroleum Holdings LLC | Iowa Park, TX 76367 | Oil Operator | Jun 2026 |
| 5838 | Clubine, Jim L. | Independence, KS 67301 | Oil Operator | Jan 2026 |
| 5839 | Clute Oil Corporation | Cherry Hills VIllage, CO 80113 | Oil & Gas Operator | Feb 2026 |
| 5840 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 5841 | Clyde G. Kissinger | | Oil Operator | Jun 1964 |
| 5842 | Clyde H & Rae M Peters | Waterford, PA 16441-8872 | Gas Operator | Dec 2007 |
| 5843 | Clyde Petroleum | | Oil & Gas Operator | Dec 1988 |
| 5844 | Clyde W. Jones | | Oil Operator | Sep 2003 |
| 5845 | Clydesdale Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2019 |
| 5846 | Clymar, Inc | New Lexington, OH 43764 | Oil & Gas Operator | Dec 1996 |
| 5847 | CM Exploration Company Inc. | | Oil & Gas Operator | Apr 2009 |
| 5848 | CM Oil Co. | FT Stockton, TX 79735 | Oil & Gas Operator | Jun 2026 |
| 5849 | CM Oil Co., L.L.C. | | Oil Operator | Jan 2025 |
| 5850 | CM Production, LLC | | Oil & Gas Operator | Aug 2020 |
| 5851 | CM TX Production, LLC | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2023 |
| 5852 | CM5 Resources, LLC | Artesia, NM 88211 | Oil & Gas Operator | Apr 2026 |
| 5853 | CMF Oil & Gas Production LLC | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2025 |
| 5854 | Cmint Productions LLC | Dallas, TX 75248-2643 | Oil Operator | Oct 2021 |
| 5855 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Jun 2026 |
| 5856 | Cmo Inc. | | Oil Operator | Mar 2026 |
| 5857 | Cmo LLC | Mannford, OK 74044 | Oil & Gas Operator | Apr 2026 |
| 5858 | CMR Energy, L.P. | Houston, TX 77077 | Oil & Gas Operator | Jun 2026 |
| 5859 | CMR Oil, LLC | McKinney, TX 75072 | Oil Operator | Jun 2026 |
| 5860 | CMR Operating LLC | Tulsa, OK 74135-2653 | Oil & Gas Operator | Jun 2018 |
| 5861 | CMS Energy Inc | Dallas, TX 75287 | Oil & Gas Operator | Mar 2026 |
| 5862 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 5863 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 5864 | CMT Oil & Gas Company Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Mar 2026 |
| 5865 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 5866 | CMW Oil Company | | Oil & Gas Operator | Dec 1976 |
| 5867 | CMX Inc Of Kansas | Wichita, KS 67206-2561 | Oil & Gas Operator | Apr 2026 |
| 5868 | CMX, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 5869 | CNC Oil Co., Inc. | | Oil Operator | Aug 1991 |
| 5870 | CNG Development Co | | Oil & Gas Operator | Dec 2008 |
| 5871 | CNG Producing | New Orleans, LA 70112-6000 | Oil & Gas Operator | Jun 2000 |
| 5872 | CNG Producing Co.-Tulsa Div. | | Oil & Gas Operator | Jun 1986 |
| 5873 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 5874 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 5875 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Mar 2026 |
| 5876 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Jun 2026 |
| 5877 | Co-Co Incorporat | | Oil Operator | Oct 1989 |
| 5878 | Co-Co Oil, Inc. | Lubbock, TX 79407 | Oil & Gas Operator | Aug 2003 |
| 5879 | Co-St Oil Operating Co Inc | Enid, OK 73706 | Oil & Gas Operator | Apr 1997 |
| 5880 | Co-Wil-Co, Incorporated | | Oil Operator | Dec 1990 |
| 5881 | Coachman Energy Operating Co, LLC | Englewood, CO 80111 | Oil Operator | May 2024 |
| 5882 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 5883 | Coal Creek Minerals LLC | Northglenn, CO 80234 | Gas Operator | Feb 2012 |
| 5884 | Coal Gas Recovery II LLC | Waynesburg, PA 15370 | Gas Operator | Dec 2017 |
| 5885 | Coal Gas Recovery LLC | | Gas Operator | Dec 2012 |
| 5886 | Coal Gas Recovery LP | Linthicum Heights, MD 21090-2227 | Gas Operator | Dec 2010 |
| 5887 | Coal Gas Transportation LLC | Cadiz, OH 43907 | Gas Operator | Dec 2016 |
| 5888 | Coal Oil & Gas Company | Ada, OK 74820 | Oil & Gas Operator | Apr 2026 |
| 5889 | Coal Oil Inc. | | Oil & Gas Operator | Dec 1997 |
| 5890 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 5891 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 5892 | Coaltech, Inc. | | Gas Operator | Jun 1993 |
| 5893 | Coast David | Bartlesville, OK 74006-0407 | Oil & Gas Operator | Apr 2026 |
| 5894 | Coast Exploration Co. | | Oil & Gas Operator | Nov 1997 |
| 5895 | Coast Supply Company LTD. | | Oil & Gas Operator | Dec 1991 |
| 5896 | Coastal Bend Petroleum Corp. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Dec 2002 |
| 5897 | Coastal Chem Inc | Midvale, UT 84047 | Oil & Gas Operator | Aug 2003 |
| 5898 | Coastal Expanse Oil & Gas | Austin, TX 78704 | Oil & Gas Operator | Jun 2026 |
| 5899 | Coastal Investments Inc. | El Campo, TX 77437 | Oil & Gas Operator | Jun 2026 |
| 5900 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |