| 6101 | Colt Energy Inco | | Oil & Gas Operator | Dec 1996 |
| 6102 | Colt Oil & Gas Co. | Abilene, TX 79601 | Oil Operator | Apr 2004 |
| 6103 | Colt Oil Company | Andrews, TX 79714 | Oil & Gas Operator | Feb 1996 |
| 6104 | Colt Oil LLC | Sapulpa, OK 74066-1010 | Oil Operator | Mar 2026 |
| 6105 | Colt Production Corp. Inc. | | Oil & Gas Operator | Jul 1996 |
| 6106 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 6107 | Colter Operating Co | Horseshoe Bay, TX 78654 | Oil & Gas Operator | Nov 1997 |
| 6108 | Coltharp, Edward H | | Oil & Gas Operator | Dec 1970 |
| 6109 | Colton Limited Liability Co | | Oil & Gas Operator | Sep 2023 |
| 6110 | Coltrane Charles | | Oil Operator | Dec 1980 |
| 6111 | Columbia Energy Properties, Inc. | Baytown, TX 77521 | Oil & Gas Operator | Jul 2004 |
| 6112 | Columbia Gas Dev. Corp. | | Oil & Gas Operator | Apr 1996 |
| 6113 | Columbia Gas Development | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 6114 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 6115 | Columbia Gas Trans Corp | | Gas Operator | Dec 1987 |
| 6116 | Columbia Gas Transmission, LLC | Charleston, WV 25314 | Oil & Gas Operator | Dec 2021 |
| 6117 | Columbia Gulf Transmission Co. | | Oil Operator | Dec 2014 |
| 6118 | Columbia Gulf Transmission Company, LLC | | Oil Operator | Jan 2025 |
| 6119 | Columbia Minerals Corp., Inc. | | Oil & Gas Operator | May 1996 |
| 6120 | Columbia Natural Res Inc | Charleston, WV 25362-0070 | Gas Operator | Dec 2008 |
| 6121 | Columbia Natural Resources, LLC | Charleston, WV 23502 | Oil & Gas Operator | Dec 2021 |
| 6122 | Columbia Oil Company, Inc | | Oil & Gas Operator | Jan 2025 |
| 6123 | Columbia Petrole | | Oil Operator | Sep 1988 |
| 6124 | Columbia Petroleum Corp. | | Oil & Gas Operator | Jun 1982 |
| 6125 | Columbia Petroleum LLC | Oyster Bay, NY 11771 | Oil & Gas Operator | Feb 2025 |
| 6126 | Columbia Petroleum, LTD. | Lewistown, MT 59457 | Oil Operator | Apr 2026 |
| 6127 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 6128 | Columbian Production Corporation | Topeka, KS 66601 | Oil Operator | Oct 1999 |
| 6129 | Columbian Servic | | Oil & Gas Operator | Nov 1993 |
| 6130 | Columbian Services C | | Oil Operator | Jan 1992 |
| 6131 | Columbian Services Corporation | Topeka, KS 66603 | Gas Operator | Dec 2009 |
| 6132 | Columbine Associates | | Oil & Gas Operator | May 2026 |
| 6133 | Columbine Exploration Corp | Englewood, CO 80111 | Oil & Gas Operator | Aug 1998 |
| 6134 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 6135 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Aug 2026 |
| 6136 | Columbus III Production LC | | Oil Operator | Oct 2003 |
| 6137 | Columbus Oil And Gas LLC | | Oil Operator | Oct 2020 |
| 6138 | Columbus Oil Company | Seminole, OK 74868 | Oil & Gas Operator | May 2026 |
| 6139 | Columbus Oilfield Explor Co | Powell, OH 43065-9315 | Gas Operator | Dec 2004 |
| 6140 | Columbus Oilfield Exploration Company | Columbus, OH 43220 | Oil & Gas Operator | Dec 2013 |
| 6141 | Columbus Production Inc | | Oil & Gas Operator | Mar 2005 |
| 6142 | Comac Well Service, Inc. | Borger, TX 79008 | Oil & Gas Operator | Mar 2008 |
| 6143 | Comal Operating LLC | Fredericksbrg, TX 78624 | Oil & Gas Operator | Aug 2026 |
| 6144 | Comanche Drilling Company | Cut Bank, MT 59427 | Oil & Gas Operator | May 2026 |
| 6145 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | May 2026 |
| 6146 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 6147 | Comanche Oil & Gas Corp | Salt Lake City, UT 84107-3075 | Oil & Gas Operator | May 2005 |
| 6148 | Comanche Oil And Service, LLC | | Oil Operator | Apr 2026 |
| 6149 | Comanche Operating Co. | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2002 |
| 6150 | Comanche Petroleum Corporation | Oklahoma City, OK 73179 | Oil & Gas Operator | Apr 2024 |
| 6151 | Comanche Product | | Oil & Gas Operator | Jan 1992 |
| 6152 | Comanche Production Co | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 6153 | Comanche Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2006 |
| 6154 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2026 |
| 6155 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | Aug 2026 |
| 6156 | Combest A L | Purcell, OK 73080-6829 | Oil & Gas Operator | Aug 2021 |
| 6157 | Combined Oil & Gas | Denver, CO 80202 | Oil & Gas Operator | Feb 1990 |
| 6158 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Aug 2026 |
| 6159 | Combs Production LLC | Depew, OK 74028 | Oil & Gas Operator | Apr 2026 |
| 6160 | Combs, Steven H | Corydon, KY 42406 | Oil Operator | Dec 2023 |
| 6161 | Comco Of Louisiana, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2000 |
| 6162 | Comdisco Exploration Inc | | Oil Operator | Dec 1990 |
| 6163 | Comdisco Resources Inc | | Oil Operator | Aug 2004 |
| 6164 | Comerica Properties Corp | | Oil Operator | May 1985 |
| 6165 | Comet Energy Services LLC | Traverse City, MI 49686 | Oil & Gas Operator | Oct 2011 |
| 6166 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Aug 2026 |
| 6167 | Comet Oil Company | Velma, OK 73091 | Oil & Gas Operator | May 2005 |
| 6168 | Comet Production | Conroe, TX 77305 | Oil Operator | Aug 2026 |
| 6169 | Comet-Haines Oil Company | Sulphur, OK 73086-0546 | Oil & Gas Operator | Mar 2013 |
| 6170 | Cometra Oil And Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1997 |
| 6171 | Comgas Inc | Hebron, OH 43025-9716 | Oil & Gas Operator | Dec 1988 |
| 6172 | Command Energy Operating LLC | Tulsa, OK 74119 | Oil & Gas Operator | May 2026 |
| 6173 | Commander Oil Company LTD. | | Oil & Gas Operator | Dec 2021 |
| 6174 | Commerce Energy Co | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1987 |
| 6175 | Commerce Energy, Inc. | | Oil & Gas Operator | Dec 1999 |
| 6176 | Commerce Oil & Gas Co | Rocky River, OH 44116 | Oil & Gas Operator | Dec 1996 |
| 6177 | Commercial Energ | | Gas Operator | Oct 1996 |
| 6178 | Commercial Oil - | | Oil Operator | Apr 1994 |
| 6179 | Commercial Oil Company, Inc. | Wichita, KS 67204 | Oil Operator | Jun 2001 |
| 6180 | Commodore Energy Co | Rolling Hills, CA 90274-5265 | Oil & Gas Operator | Dec 2007 |
| 6181 | Common Energy Inc | Douglas, WY 82633 | Oil & Gas Operator | Aug 1995 |
| 6182 | Common Resources L.L.C. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 6183 | Commonwealth Energy, Inc. | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2021 |
| 6184 | Commonwealth Pet | | Oil & Gas Operator | Nov 1995 |
| 6185 | Commonwealth Resources, LLC | Fort Collins, CO 80524 | Oil Operator | Dec 2008 |
| 6186 | Commonwealth Royalty, LLC | Balmorhea, TX 79718 | Oil Operator | Aug 2026 |
| 6187 | Compadre Drilling & Expl Corp | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2015 |
| 6188 | Compadres, Inc. | | Oil & Gas Operator | Dec 1988 |
| 6189 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 6190 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2026 |
| 6191 | Compass Exploration LLC | Hill City, KS 67642 | Oil Operator | Apr 2026 |
| 6192 | Compass Global Resources LLC | | Oil & Gas Operator | Dec 2015 |
| 6193 | Compass Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Aug 2026 |
| 6194 | Compass Resources | Enid, OK 73702 | Oil & Gas Operator | Dec 2007 |
| 6195 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 6196 | Complete Oil & Gas Services, LLC | Perkins, OK 74059 | Oil & Gas Operator | Aug 2026 |
| 6197 | Compostella Oil Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 6198 | Compressor Syste | | Oil Operator | May 1991 |
| 6199 | Compro Services Inc | Williamstown, WV 26187 | Oil & Gas Operator | Dec 1985 |
| 6200 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2026 |