| 1 | C And S Oil & Gas | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1998 |
| 2 | C Oil Co. | New Braunfels, TX 78132 | Oil & Gas Operator | Feb 2017 |
| 3 | C&C II | Pleasanton, TX 78064 | Oil & Gas Operator | Mar 1998 |
| 4 | C.F.O., Inc. | Liberty, TX 77575 | Oil Operator | Jun 2025 |
| 5 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Jun 2025 |
| 6 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 7 | Cactus Jack Operating Company | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2003 |
| 8 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | Jun 2025 |
| 9 | Cal Oil Company | Missouri City, TX 77459 | Oil Operator | May 2022 |
| 10 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 11 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Jun 2025 |
| 12 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Jun 2025 |
| 13 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 14 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2025 |
| 15 | Cantro Exploration, Inc. | San Antonio, TX 78270 | Oil & Gas Operator | May 2000 |
| 16 | Capitol Operating & Expl., Inc. | Austin, TX 78766 | Oil & Gas Operator | Feb 2001 |
| 17 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jun 2025 |
| 18 | Caribbean Energy, L.L.C. | Cotulla, TX 78014 | Oil & Gas Operator | Nov 2019 |
| 19 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 20 | Carrizo Exploration, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2016 |
| 21 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 22 | Catarina Petroleum L. C. | Dallas, TX 75228 | Oil & Gas Operator | Jun 2008 |
| 23 | CCV, Inc. | Houston, TX 77019 | Oil & Gas Operator | Sep 1994 |
| 24 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Jun 2025 |
| 25 | Central Gulf Petroleum Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2025 |
| 26 | Chandler Oil & Gas, LLC | Beeville, TX 78102 | Oil & Gas Operator | Jun 2025 |
| 27 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | Jun 2025 |
| 28 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 29 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2025 |
| 30 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2025 |
| 31 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Jun 2025 |
| 32 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Jun 2025 |
| 33 | Churchill Operating, LLC | Houston, TX 77007 | Oil & Gas Operator | Jun 2025 |
| 34 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Jun 2025 |
| 35 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jun 2025 |
| 36 | Civron Petroleum Res., LLC | San Antonio, TX 78229 | Oil & Gas Operator | Jun 2025 |
| 37 | Clamp Operating Incorporated | San Antonio, TX 78264 | Oil & Gas Operator | Mar 2011 |
| 38 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Jun 2025 |
| 39 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | Jun 2025 |
| 40 | Clipper Operating Co., Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 2000 |
| 41 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 42 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Jun 2025 |
| 43 | Colt Operating Corporation | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 44 | Columbia Energy Properties, Inc. | Baytown, TX 77521 | Oil & Gas Operator | Jul 2004 |
| 45 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 46 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 47 | Concho Oilfield Serv & Oper Co. | Eden, TX 76837 | Oil & Gas Operator | Jun 2025 |
| 48 | Concord Energy, Inc. | Glen Rose, TX 76043 | Oil & Gas Operator | Jun 2025 |
| 49 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 50 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 51 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Jun 2025 |
| 52 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2025 |
| 53 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 54 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 55 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 56 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 57 | Creative Oil And Gas Op II, LLC | San Antonio, TX 78246 | Oil Operator | Jun 2025 |
| 58 | Crimson Energy Partners IV, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2023 |
| 59 | Crimson Energy Partners, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2009 |
| 60 | Crimson Exploration Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2006 |
| 61 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 62 | Crossroads Mineral Prod., L.L.C. | Seguin, TX 78155 | Oil Operator | Jun 2025 |
| 63 | Cuatro Petro Corp. | Richardson, TX 75080 | Oil & Gas Operator | Jun 2025 |