| 1 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | Jul 2025 |
| 2 | Caliente Oil LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Jul 2025 |
| 3 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 4 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Jul 2025 |
| 5 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 6 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 7 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 8 | Carrizo Exploration, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2016 |
| 9 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 10 | Catarina Petroleum L. C. | Dallas, TX 75228 | Oil & Gas Operator | Jun 2008 |
| 11 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Jul 2025 |
| 12 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Jul 2025 |
| 13 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 14 | Chapco, Inc. | Benavides, TX 78341 | Oil & Gas Operator | Jul 2025 |
| 15 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2025 |
| 16 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 17 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2025 |
| 18 | Chisholm Oil & Gas, LC | Buda, TX 78610 | Oil & Gas Operator | Jul 2025 |
| 19 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 20 | Civron Petroleum Res., LLC | San Antonio, TX 78229 | Oil & Gas Operator | Jul 2025 |
| 21 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Jul 2025 |
| 22 | CLS Interests, Incorporated | Austin, TX 78734 | Oil & Gas Operator | Jan 1997 |
| 23 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 24 | CMR Energy, L.P. | Houston, TX 77077 | Oil & Gas Operator | Jul 2025 |
| 25 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 26 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 27 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 28 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |
| 29 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 30 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 31 | Columbia Energy Properties, Inc. | Baytown, TX 77521 | Oil & Gas Operator | Jul 2004 |
| 32 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 33 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 34 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 35 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 36 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 37 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 38 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 39 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Jul 2025 |
| 40 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 41 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 42 | Crimson Energy Partners IV, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2023 |
| 43 | Crimson Energy Partners, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2009 |
| 44 | Crimson Energy PTNRS III, L.L.C. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 45 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 46 | Cuatro Petro Corp. | Richardson, TX 75080 | Oil & Gas Operator | Jul 2025 |
| 47 | Culoco, Inc. | Dallas, TX 75374 | Oil & Gas Operator | Nov 2024 |