| 1 | C & H Energy LLC | Blue Mound, KS 66010 | Oil Operator | Nov 2009 |
| 2 | C S J, Inc. | Austin, TX 78716 | Oil & Gas Operator | Feb 2026 |
| 3 | Caddell Well Service, Inc. | Prairie Lea, TX 78661 | Oil & Gas Operator | Feb 2026 |
| 4 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | Feb 2026 |
| 5 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 6 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 7 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Feb 2026 |
| 8 | Centex Pipe & Equipment, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 9 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 10 | Cheatham Well Service, Inc. | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 11 | Cherry Oil & Gas | Luling, TX 78648 | Oil & Gas Operator | Dec 2000 |
| 12 | Chessher, Otto Drilling Company | Kearney, MO 64060 | Oil & Gas Operator | Dec 2013 |
| 13 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Feb 2026 |
| 14 | Circle-S Energy, LLC | McKinney, TX 75071 | Oil & Gas Operator | Feb 2026 |
| 15 | Civron Petroleum Res., LLC | San Antonio, TX 78229 | Oil & Gas Operator | Feb 2026 |
| 16 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 17 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 18 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 19 | Colby Production Resources, LLC | Granbury, TX 76048 | Oil Operator | Feb 2026 |
| 20 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 21 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 22 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 23 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 24 | Crossroads Mineral Prod., L.L.C. | Seguin, TX 78155 | Oil Operator | Feb 2026 |
| 25 | Crossroads Vacuum & Weld. Serv. | Luling, TX 78648 | Oil Operator | Mar 2010 |
| 26 | CT Adams Jr., LLC | Schulenburg, TX 78956 | Oil Operator | Feb 2026 |
| 27 | CTL Oil & Gas Corporation | Buchanan Dam, TX 78609 | Oil & Gas Operator | Nov 2020 |