| 1001 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 1002 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 1003 | Csa Exploration Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Aug 2003 |
| 1004 | CSL Exploration, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2018 |
| 1005 | Cso Consulting | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2020 |
| 1006 | CT Adams Jr., LLC | Schulenburg, TX 78956 | Oil Operator | Feb 2026 |
| 1007 | CTC Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 1008 | CTL Oil & Gas Corporation | Buchanan Dam, TX 78609 | Oil & Gas Operator | Nov 2020 |
| 1009 | CTL Production, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 1010 | CTR Petroleum, Inc. | Corpus Chrsti, TX 78414 | Oil & Gas Operator | Mar 2015 |
| 1011 | CTX Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 1012 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Feb 2026 |
| 1013 | Cuatro Petro Corp. | Richardson, TX 75080 | Oil & Gas Operator | Feb 2026 |
| 1014 | Cuba, John H. | Olney, TX 76374 | Oil Operator | Feb 2026 |
| 1015 | Cucharas Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 1016 | Cuervo Resources, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Oct 1996 |
| 1017 | Cuervo, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Feb 2026 |
| 1018 | Culebra Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 1019 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Feb 2026 |
| 1020 | Culoco, Inc. | Dallas, TX 75374 | Oil & Gas Operator | Nov 2024 |
| 1021 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 1022 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 1023 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 1024 | Cummings, C. M. Oil & Gas | Lewisville, TX 75029 | Oil & Gas Operator | Nov 1993 |
| 1025 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 1026 | Cundiff Operating Company | Dallas, TX 75238 | Oil & Gas Operator | Feb 2026 |
| 1027 | Curmar Producers | Adairsville, GA 30103 | Oil Operator | Mar 2008 |
| 1028 | Currie Cattle Co. | Big Spring, TX 79720 | Oil & Gas Operator | Sep 2007 |
| 1029 | Curzac Oil And Gas, LLC | Texarkana, TX 75503 | Oil & Gas Operator | Feb 2026 |
| 1030 | Cusack, Michael F. | Austin, TX 78768 | Gas Operator | Jun 2011 |
| 1031 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1032 | Cutbow Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 1033 | Cuyahoga Expl. & Devel. Corp. | Jericho, NY 11753 | Oil & Gas Operator | Dec 1996 |
| 1034 | CVR Supply & Trading, LLC | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 1035 | CVS Operating, LLC. | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 1036 | CVS Production, LLC. | Plano, TX 75074 | Oil Operator | Feb 2026 |
| 1037 | CW Dalcan Management SVCS, LTD. | Frisco, TX 75033 | Oil Operator | Feb 2026 |
| 1038 | CWC Oil & Gas, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 1039 | CWD Resources, LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 1040 | CWF Energy, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1997 |
| 1041 | Cwic, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Feb 2026 |
| 1042 | Cwo Energy, LLC | Midland, TX 79705 | Oil Operator | Feb 2026 |
| 1043 | Cwoc | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2026 |
| 1044 | CWS Aceite Operating, Inc. | Cotulla, TX 78014 | Oil & Gas Operator | Aug 2018 |
| 1045 | CX Operating LLC | Dallas, TX 75238 | Oil & Gas Operator | Feb 2026 |
| 1046 | CXL Energy LLC | Canada, 00100 | Oil & Gas Operator | Feb 2026 |
| 1047 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 1048 | Cyber Enviro-Tech Inc | San Tan Valley, AZ 85144 | Oil & Gas Operator | Feb 2026 |
| 1049 | Cycle Oil & Gas Inc. | Katy, TX 77449 | Oil Operator | Feb 2026 |
| 1050 | Cyclone Exploration, Inc. | Florence, CO 81226 | Oil & Gas Operator | Feb 2026 |
| 1051 | Cymraec Resources, Inc. | Houston, TX 77060 | Gas Operator | Sep 2007 |
| 1052 | Cymri Corporation, The | Houston, TX 77057 | Oil & Gas Operator | Mar 2008 |
| 1053 | Cymri, L.L.C. | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 1054 | Cynpat Oil & Gas, Inc. | Sulphur SPGS, TX 75482 | Oil Operator | Nov 2018 |
| 1055 | Cypress E & P Corporation | Leander, TX 78646 | Oil & Gas Operator | Sep 2016 |
| 1056 | Cypress Energy Development Co | Cypress, TX 77429 | Oil & Gas Operator | Jun 1999 |
| 1057 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 1058 | Cypress Partners, Inc. | Houston, TX 77068 | Oil & Gas Operator | May 1999 |
| 1059 | Cypress Production, Inc. | Azle, TX 76020 | Oil & Gas Operator | Feb 2026 |
| 1060 | Cytex South Texas Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |