| 6001 | Clover Production Company | Sourlake, TX 77659 | Oil & Gas Operator | Jun 2025 |
| 6002 | Clowser Well Service, Inc. | | Oil & Gas Operator | Dec 2021 |
| 6003 | CLR Gauging Corp. | Tuleta, TX 78162 | Oil & Gas Operator | Jun 2025 |
| 6004 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Jun 2025 |
| 6005 | CLS Interests, Incorporated | Austin, TX 78734 | Oil & Gas Operator | Jan 1997 |
| 6006 | CLS Petroleum Holdings LLC | Iowa Park, TX 76367 | Oil Operator | Jun 2025 |
| 6007 | Clsog L.C. | Houston, TX 77024 | Gas Operator | Jun 2008 |
| 6008 | Clubine, Jim L. | Independence, KS 67301 | Oil Operator | Nov 2024 |
| 6009 | Clute Oil Corporation | Cherry Hills VIllage, CO 80113 | Oil & Gas Operator | Feb 2025 |
| 6010 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 6011 | CLX Oil & Gas LLC | | Oil & Gas Operator | Feb 2005 |
| 6012 | Clyde G. Kissinger | | Oil Operator | Jun 1964 |
| 6013 | Clyde H & Rae M Peters | Waterford, PA 16441-8872 | Gas Operator | Dec 2007 |
| 6014 | Clyde Petroleum | | Oil & Gas Operator | Dec 1988 |
| 6015 | Clyde W. Jones | | Oil Operator | Sep 2003 |
| 6016 | Clydesdale Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2019 |
| 6017 | Clymar, Inc | New Lexington, OH 43764 | Oil & Gas Operator | Dec 1996 |
| 6018 | CM Exploration Company Inc. | | Oil & Gas Operator | Apr 2009 |
| 6019 | CM Oil Co. | FT Stockton, TX 79735 | Oil & Gas Operator | Jun 2025 |
| 6020 | CM Oil Co., L.L.C. | | Oil Operator | Jan 2025 |
| 6021 | CM Production LLC | | Oil & Gas Operator | Aug 2020 |
| 6022 | CM TX Production, LLC | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2023 |
| 6023 | CM5 Resources, LLC | Artesia, NM 88211 | Oil & Gas Operator | Apr 2025 |
| 6024 | Cmint Productions LLC | Dallas, TX 75248-2643 | Oil Operator | Oct 2021 |
| 6025 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Jun 2025 |
| 6026 | Cmo Inc. | | Oil Operator | Apr 2025 |
| 6027 | Cmo LLC | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2025 |
| 6028 | CMR Energy, L.P. | Houston, TX 77077 | Oil & Gas Operator | Jun 2025 |
| 6029 | CMR Oil, LLC | McKinney, TX 75072 | Oil Operator | Jun 2025 |
| 6030 | CMR Operating LLC | Tulsa, OK 74135-2653 | Oil & Gas Operator | Jun 2018 |
| 6031 | CMS Energy Inc | Dallas, TX 75287 | Oil & Gas Operator | Mar 2025 |
| 6032 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 6033 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 6034 | CMT Oil & Gas Company Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Mar 2025 |
| 6035 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 6036 | CMW Oil Company | | Oil & Gas Operator | Dec 1976 |
| 6037 | CMX Inc Of Kansas | Wichita, KS 67206-2561 | Oil & Gas Operator | Apr 2025 |
| 6038 | CMX, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Feb 2025 |
| 6039 | CN Operating Company | Drumright, OK 74030 | Oil & Gas Operator | Nov 1998 |
| 6040 | CNC Oil Co., Inc. | | Oil Operator | Aug 1991 |
| 6041 | CNG Development Co | | Oil & Gas Operator | Dec 2008 |
| 6042 | CNG Producing | New Orleans, LA 70112-6000 | Oil & Gas Operator | Jun 2000 |
| 6043 | CNG Producing Co.-Tulsa Div. | | Oil & Gas Operator | Jun 1986 |
| 6044 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 6045 | CNR Resources, Inc. | Houston, TX 77002-4103 | Oil & Gas Operator | May 2005 |
| 6046 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 6047 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Apr 2025 |
| 6048 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Jun 2025 |
| 6049 | Co-Co Incorporat | | Oil Operator | Oct 1989 |
| 6050 | Co-Co Oil, Inc. | Lubbock, TX 79407 | Oil & Gas Operator | Aug 2003 |
| 6051 | Co-St Oil Operating Co Inc | Enid, OK 73706 | Oil & Gas Operator | Apr 1997 |
| 6052 | Co-Wil-Co, Incorporated | | Oil Operator | Dec 1990 |
| 6053 | Coachman Energy Operating Company LLC | Englewood, CO 80111 | Oil & Gas Operator | May 2024 |
| 6054 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 6055 | Coal Creek Minerals LLC | Northglenn, CO 80234 | Gas Operator | Feb 2012 |
| 6056 | Coal Gas Recovery II LLC | Waynesburg, PA 15370 | Gas Operator | Dec 2017 |
| 6057 | Coal Gas Recovery LLC | Waynesburg, PA 15370-2330 | Gas Operator | Dec 2012 |
| 6058 | Coal Gas Recovery LP | Linthicum Heights, MD 21090-2227 | Gas Operator | Dec 2010 |
| 6059 | Coal Gas Transportation LLC | Cadiz, OH 43907 | Gas Operator | Dec 2016 |
| 6060 | Coal Oil & Gas Company | Ada, OK 74820 | Oil & Gas Operator | Apr 2025 |
| 6061 | Coal Oil Inc. | | Oil & Gas Operator | Dec 1997 |
| 6062 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 6063 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 6064 | Coaltech, Inc. | | Gas Operator | Jun 1993 |
| 6065 | Coark Dev, Inc | Pikeville, KY 41502 | Oil & Gas Operator | Dec 2023 |
| 6066 | Coast David | Bartlesville, OK 74006-0407 | Oil & Gas Operator | Mar 2025 |
| 6067 | Coast Exploration Co. | | Oil & Gas Operator | Nov 1997 |
| 6068 | Coast Supply Company LTD. | | Oil & Gas Operator | Dec 1991 |
| 6069 | Coastal Bend Petroleum Corp. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Dec 2002 |
| 6070 | Coastal Chem Inc | Midvale, UT 84047 | Oil & Gas Operator | Aug 2003 |
| 6071 | Coastal Expanse Oil & Gas | Austin, TX 78704 | Oil & Gas Operator | Jun 2025 |
| 6072 | Coastal Investments Inc. | El Campo, TX 77437 | Oil & Gas Operator | Jun 2025 |
| 6073 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 6074 | Coastal Minerals, Inc. | | Oil Operator | Aug 1991 |
| 6075 | Coastal New Mexico MGMT LLC | Carlsbad, NM 88220 | Oil & Gas Operator | Jun 2025 |
| 6076 | Coastal Oil & Ga | | Oil & Gas Operator | Oct 1996 |
| 6077 | Coastal Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 6078 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 6079 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 6080 | Coastal Petro Corp | Oil City, PA 16301-6327 | Oil & Gas Operator | Jul 2018 |
| 6081 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jun 2025 |
| 6082 | Coastal Plains Exploration, LLC | Port Lavaca, TX 77979 | Oil & Gas Operator | Jun 2025 |
| 6083 | Coastal Production Company, Inc. | El Campo, TX 77437 | Oil & Gas Operator | Aug 1995 |
| 6084 | Coastal Production Inc. | | Oil & Gas Operator | Aug 2000 |
| 6085 | Coastal Shoreline Corp. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Aug 2003 |
| 6086 | Coastal States & Emerald Oil | | Oil & Gas Operator | Dec 1979 |
| 6087 | Coastal States Gas Prod. Co. | | Oil & Gas Operator | Jun 1996 |
| 6088 | Coastland Operations, LLC | Dallas, TX 75287 | Oil & Gas Operator | Jun 2025 |
| 6089 | Coastline Exploration, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Jun 2025 |
| 6090 | Coastline Operating, L.L.C. | Houston, TX 77027 | Oil & Gas Operator | Dec 2006 |
| 6091 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 6092 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |
| 6093 | Coats Energy, Inc. | Wichita, KS 67201 | Oil & Gas Operator | Feb 2025 |
| 6094 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Feb 2025 |
| 6095 | Cobalt Environmental Solutions LLC | Oklahoma City, OK 73101-0249 | Oil Operator | Jun 2019 |
| 6096 | Cobalt Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2025 |
| 6097 | Cobb, E M | Henderson, KY 42420 | Oil Operator | Dec 2022 |
| 6098 | Cobb, Maurice W | | Oil Operator | Dec 2023 |
| 6099 | Cobb, Maurice W Dba M W C Oil Co | Eddyville, KY 42038 | Oil Operator | Dec 2022 |
| 6100 | Cobbs Brothers Oil & Gas | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Jun 2009 |