| 1 | A & D Exploration Company | Rockport, TX 78381 | Oil & Gas Operator | Apr 2024 |
| 2 | A A Production Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 1998 |
| 3 | A T M Corporation | Mathis, TX 78368 | Oil & Gas Operator | Oct 2002 |
| 4 | A.O.E. Operators, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2024 |
| 5 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2024 |
| 6 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 7 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 8 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 9 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 10 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Apr 2024 |
| 11 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 12 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 13 | Advantage Oil & Gas, Inc. | Pinehurst, TX 77362 | Oil & Gas Operator | Apr 2024 |
| 14 | Agape Energy Inc. | San Antonio, TX 78280 | Oil Operator | Apr 2024 |
| 15 | Agp Energy Services LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 16 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 17 | Albrecht, Phil A., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2005 |
| 18 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 19 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Apr 2024 |
| 20 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2024 |
| 21 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 22 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 23 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 24 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 25 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 26 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 27 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 28 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 29 | American Int'L Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 30 | American Pumping & Trucking | New Braunfels, TX 78131 | Oil & Gas Operator | Apr 2024 |
| 31 | American Shoreline, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 32 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2024 |
| 33 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 34 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |
| 35 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 36 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 37 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 38 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 39 | Anderson, Steven C. | Victoria, TX 77902 | Gas Operator | Jun 2004 |
| 40 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 41 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2024 |
| 42 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2024 |
| 43 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 44 | Aransas Resources, Inc | Houston, TX 77083 | Oil & Gas Operator | Dec 2005 |
| 45 | Aransas Resources, LP | Houston, TX 77006 | Oil & Gas Operator | Oct 2006 |
| 46 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 47 | Arm Energy Management LLC | Houston, TX 77070 | Oil Operator | Mar 2015 |
| 48 | Armour Resource Holdings, LTD. | Houston, TX 77046 | Oil & Gas Operator | Nov 1994 |
| 49 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 50 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 51 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Apr 2024 |
| 52 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 53 | Atoka Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 54 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 55 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Apr 2024 |
| 56 | Averill, W. M. Inc. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2003 |
| 57 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Apr 2024 |