| 1 | C.C.O. & G. Company Inc. | Austin, TX 78765 | Oil & Gas Operator | Sep 1995 |
| 2 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 3 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 4 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 5 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 6 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 7 | Cantera Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2017 |
| 8 | Capital Star Oil & Gas, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 9 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 10 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 11 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 12 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 13 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Dec 2024 |
| 14 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 15 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 16 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 17 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 18 | Choctaw Resources, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Dec 2019 |
| 19 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Mar 2025 |
| 20 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 21 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 22 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 23 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 24 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Mar 2025 |
| 25 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 26 | CM TX Production, LLC | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2023 |
| 27 | CMR Energy, L.P. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 28 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 29 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Mar 2025 |
| 30 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 31 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 32 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |
| 33 | Colo Construction Co., Inc. | Abilene, TX 79602 | Oil Operator | Apr 2004 |
| 34 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Mar 2025 |
| 35 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 36 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 37 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 38 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 39 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 40 | Corda Corporation | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 2025 |
| 41 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2025 |
| 42 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 43 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 44 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 45 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 46 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 47 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 48 | CTR Petroleum, Inc. | Corpus Chrsti, TX 78414 | Oil & Gas Operator | Mar 2015 |
| 49 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |