| 901 | Crescent Exploration Company | Austin, TX 78767 | Oil & Gas Operator | Aug 1995 |
| 902 | Crescent Exploration, LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 903 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2026 |
| 904 | Crest Operating Company | Houston, TX 77042 | Oil & Gas Operator | Apr 2026 |
| 905 | Crest Petroleum, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 906 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 907 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 908 | Crestmont Operating LLC | New York, NY 10151 | Oil Operator | Apr 2026 |
| 909 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | Apr 2026 |
| 910 | Crestridge DRLG. & Prod.Co.,LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 911 | Creswell, Chris | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 912 | Creswell, R.G. | Graham, TX 76450 | Oil & Gas Operator | Feb 2013 |
| 913 | Crey Oil & Gas LLC | Sundown, TX 79372 | Oil Operator | Apr 2026 |
| 914 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 915 | Crimson Energy Partners IV, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2023 |
| 916 | Crimson Energy Partners, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2009 |
| 917 | Crimson Energy PTNRS III, L.L.C. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 918 | Crimson Exploration Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2006 |
| 919 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 920 | Crisis Oil Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jun 1995 |
| 921 | Criterion Energy, Limited | Austin, TX 78737 | Gas Operator | Jan 2003 |
| 922 | CRJ Bond Operations, LLC | Graham, TX 76450 | Oil Operator | Apr 2026 |
| 923 | CRM Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2026 |
| 924 | Crocker Oil Company | Windthorst, TX 76389 | Oil & Gas Operator | Aug 1999 |
| 925 | Crockett Operating, LLC | Arlington, TX 76017 | Oil & Gas Operator | Apr 2026 |
| 926 | Crockett Operting, LLC | Arlington, TX 76013 | Oil & Gas Operator | Oct 2020 |
| 927 | Croker, Danny | Wichita Falls, TX 76302 | Oil & Gas Operator | Apr 2026 |
| 928 | Cromeens Petroleum, Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Sep 1996 |
| 929 | Crone Oil Company | Gruver, TX 79040 | Oil & Gas Operator | Apr 2026 |
| 930 | Cross Creek Energy LLC | Houston, TX 77074 | Oil & Gas Operator | Aug 2013 |
| 931 | Cross Cut Petroleum, LLC | Abilene, TX 79602 | Oil & Gas Operator | Apr 2026 |
| 932 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 933 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 934 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 935 | Cross Winds Oil & Gas, LLC | Gruver, TX 79040 | Gas Operator | Apr 2026 |
| 936 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 937 | Crossfoot Operating, LLC | Houston, TX 77227 | Oil & Gas Operator | Apr 2026 |
| 938 | Crossing Rocks Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 939 | Crossland Oil & Gas | Dallas, TX 75205 | Oil & Gas Operator | Aug 1994 |
| 940 | Crosspoint Energy Company | Dallas, TX 75205 | Oil & Gas Operator | Oct 2007 |
| 941 | Crossroads Energy L.P. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 942 | Crossroads Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2018 |
| 943 | Crossroads Mineral Prod., L.L.C. | Seguin, TX 78155 | Oil Operator | Apr 2026 |
| 944 | Crossroads Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 945 | Crossroads Petroleum L.L.C. | San Benito, TX 78586 | Oil & Gas Operator | Apr 2026 |
| 946 | Crossroads Vacuum & Weld. Serv. | Luling, TX 78648 | Oil Operator | Mar 2010 |
| 947 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | Apr 2026 |
| 948 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 949 | Crouch, Eugene Louis | Lockhart, TX 78644 | Oil & Gas Operator | Apr 1999 |
| 950 | Crow Creek Operating Co II LLC | Houston, TX 77252 | Oil & Gas Operator | Jul 2011 |
| 951 | Crow, David | Shreveport, LA 71106 | Oil & Gas Operator | May 2001 |
| 952 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Feb 2026 |
| 953 | Crown Equipment Co. | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2026 |
| 954 | Crown Petroleum Corp. | Oklahoma City, OK 73106 | Oil & Gas Operator | Apr 2026 |
| 955 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 956 | Crozier & Company | Tyler, TX 75703 | Oil & Gas Operator | Jan 2020 |
| 957 | CRT'S, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Aug 2008 |
| 958 | Crude Operators, L.L.C. | Pampa, TX 79066 | Oil & Gas Operator | Apr 2026 |
| 959 | Crude Production Company | Clyde, TX 79510 | Oil & Gas Operator | Apr 2026 |
| 960 | Crude Resources, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Mar 2008 |
| 961 | Crump Operating | Henrietta, TX 76365 | Oil & Gas Operator | Apr 2026 |
| 962 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 963 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 964 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 965 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 966 | Crutcher Oil Properties | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 967 | Cruthird, Mark Oil | Grandfield, OK 73546 | Oil & Gas Operator | Apr 2026 |
| 968 | Crystal J Oil And Gas LLC | San Angelo, TX 76904 | Oil & Gas Operator | Apr 2026 |
| 969 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 970 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 971 | Csa Exploration Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Aug 2003 |
| 972 | CSL Exploration, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2018 |
| 973 | Cso Consulting | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2020 |
| 974 | CT Adams Jr., LLC | Schulenburg, TX 78956 | Oil Operator | Apr 2026 |
| 975 | CTC Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 976 | CTL Oil & Gas Corporation | Buchanan Dam, TX 78609 | Oil & Gas Operator | Nov 2020 |
| 977 | CTL Production, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2026 |
| 978 | CTR Petroleum, Inc. | Corpus Chrsti, TX 78414 | Oil & Gas Operator | Mar 2015 |
| 979 | CTX Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 980 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Apr 2026 |
| 981 | Cuatro Petro Corp. | Richardson, TX 75080 | Oil & Gas Operator | Apr 2026 |
| 982 | Cuba, John H. | Olney, TX 76374 | Oil Operator | Apr 2026 |
| 983 | Cucharas Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 984 | Cuervo Resources, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Oct 1996 |
| 985 | Cuervo, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Apr 2026 |
| 986 | Culebra Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 987 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Apr 2026 |
| 988 | Culoco, Inc. | Dallas, TX 75374 | Oil & Gas Operator | Nov 2024 |
| 989 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Apr 2026 |
| 990 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 991 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2026 |
| 992 | Cummings, C. M. Oil & Gas | Lewisville, TX 75029 | Oil & Gas Operator | Nov 1993 |
| 993 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 994 | Cundiff Operating Company | Dallas, TX 75238 | Oil & Gas Operator | Apr 2026 |
| 995 | Curmar Producers | Adairsville, GA 30103 | Oil Operator | Mar 2008 |
| 996 | Currie Cattle Co. | Big Spring, TX 79720 | Oil & Gas Operator | Sep 2007 |
| 997 | Curzac Oil And Gas, LLC | Texarkana, TX 75503 | Oil & Gas Operator | Apr 2026 |
| 998 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 999 | Cutbow Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 1000 | Cuyahoga Expl. & Devel. Corp. | Jericho, NY 11753 | Oil & Gas Operator | Dec 1996 |