| 1 | C&C II | Pleasanton, TX 78064 | Oil & Gas Operator | Mar 1998 |
| 2 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 3 | Cal Oil Company | Missouri City, TX 77459 | Oil Operator | May 2022 |
| 4 | Calame, Richard | Devine, TX 78016 | Oil Operator | May 2025 |
| 5 | Calfas Cattle & Oil, LLC | San Antonio, TX 78205 | Oil & Gas Operator | May 2025 |
| 6 | Calfas Oil, LLC | San Antonio, TX 78205 | Oil Operator | May 2025 |
| 7 | Calk Oil Company | Lytle, TX 78052 | Oil Operator | May 2025 |
| 8 | Calk Operating, LLC | Lytle, TX 78052 | Oil Operator | May 2025 |
| 9 | Calk, Roger D. | Lytle, TX 78052 | Oil & Gas Operator | May 2025 |
| 10 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 11 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 12 | Cap Operating Inc. | Borger, TX 79008 | Oil & Gas Operator | May 2025 |
| 13 | Capital Star Oil & Gas, Inc. | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 14 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 15 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 16 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 17 | Casias Oil Well Service, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2020 |
| 18 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 19 | Century Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 20 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 21 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 22 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 23 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 24 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 25 | Chmelar, Eugene Oil & Gas | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 26 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 27 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 28 | Cinco Natural Resources Corp | La Grange, TX 78945 | Oil & Gas Operator | May 2025 |
| 29 | Cinco Oil & Gas, LLC | Dallas, TX 75204 | Oil & Gas Operator | May 2025 |
| 30 | Civron Petroleum Res., LLC | San Antonio, TX 78229 | Oil & Gas Operator | May 2025 |
| 31 | Clamp Operating | San Antonio, TX 78264 | Oil & Gas Operator | Apr 2002 |
| 32 | Clamp Operating Incorporated | San Antonio, TX 78264 | Oil & Gas Operator | Mar 2011 |
| 33 | Clark, G. A., Trustee | San Antonio, TX 78210 | Oil & Gas Operator | Nov 2017 |
| 34 | Clipper Operating Co., Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 2000 |
| 35 | CM TX Production, LLC | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2023 |
| 36 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 37 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 38 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 39 | Cologne Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2014 |
| 40 | Colt Operating Corporation | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 41 | Columbia Energy Properties, Inc. | Baytown, TX 77521 | Oil & Gas Operator | Jul 2004 |
| 42 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | May 2025 |
| 43 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 44 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 45 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 46 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 47 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 48 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 49 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 50 | Creative Oil And Gas Op II, LLC | San Antonio, TX 78246 | Oil Operator | May 2025 |
| 51 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |