| 1 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 2 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 3 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 4 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 5 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 6 | Araxas Exploration, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 7 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 8 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Apr 2024 |
| 9 | Basa Resources Inc | Dallas, TX 75254 | Oil & Gas Operator | Apr 2024 |
| 10 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 11 | Baytex USA Development, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2017 |
| 12 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2024 |
| 13 | Buckeye Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2018 |
| 14 | Coastline Operating, L.L.C. | Houston, TX 77027 | Oil & Gas Operator | Dec 2006 |
| 15 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 16 | Dual Production Partners, LLC | Nacogdoches, TX 75963 | Oil & Gas Operator | Apr 2024 |
| 17 | Emerald Oil & Gas LC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2024 |
| 18 | Endeavor Production Company | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 19 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Apr 2024 |
| 20 | Garrison Operating, L.L.C. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2024 |
| 21 | Genesis Crude Oil LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 22 | Geosouthern Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2024 |
| 23 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 24 | Graystone Energy Corporation | Judson, TX 75660 | Oil & Gas Operator | Apr 2024 |
| 25 | Gulf Tide Oil Company, The | Houston, TX 77008 | Oil & Gas Operator | Jun 1999 |
| 26 | Herd Producing Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 27 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 28 | Hunters Creek Oil & Gas | Houston, TX 77042 | Oil & Gas Operator | Apr 2024 |
| 29 | J Posey Operating LLC | Dayton, TX 77535 | Oil & Gas Operator | Apr 2024 |
| 30 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Apr 2024 |
| 31 | K-B Exploration Co. | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 32 | Legacy Resources Co., L.P. | Indianapolis, IN 46214 | Oil & Gas Operator | Apr 2019 |
| 33 | Leor Energy Indigo L.P. | Houston, TX 77079 | Gas Operator | Oct 2017 |
| 34 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 35 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 36 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 37 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 38 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 39 | Mortimer Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2024 |
| 40 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 41 | Odegard Energy, Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2020 |
| 42 | Palmer Petroleum Inc. | Shreveport, LA 71106 | Oil & Gas Operator | Apr 2024 |
| 43 | Parten Oil Co. | Houston, TX 77060 | Oil & Gas Operator | Jan 1994 |
| 44 | Parten Operating Inc. | Houston, TX 77069 | Oil & Gas Operator | Apr 2024 |
| 45 | Peak Pipeline Company | Plano, TX 75093 | Oil & Gas Operator | Oct 2007 |
| 46 | Petro-Smith Operating LLC | Houston, TX 77005 | Oil & Gas Operator | Apr 2024 |
| 47 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 48 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 49 | RHC Energy (USA) LLC | Houston, TX 77027 | Oil Operator | Apr 2024 |
| 50 | Rockefeller Hughes (USA) LLC | Houston, TX 77027 | Oil & Gas Operator | Jul 2015 |
| 51 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 52 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | Apr 2024 |
| 53 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 54 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 55 | Sonerra Resources Corporation | Nacogdoches, TX 75963 | Oil & Gas Operator | Apr 2024 |
| 56 | Southcoast Production Inc | Dayton, TX 77535 | Oil & Gas Operator | Apr 2024 |
| 57 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 58 | Standard Oil Company, Inc. | Parkesburg, WV 26103 | Oil & Gas Operator | Mar 2022 |
| 59 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 60 | Topaz Oil Company | Diboll, TX 75941 | Oil & Gas Operator | Apr 1994 |
| 61 | Trinidad Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 62 | Triple "B" Production DRLG Inc | Poynor, TX 75782 | Oil & Gas Operator | Sep 2022 |
| 63 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Apr 2024 |
| 64 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 65 | Upstream Resource Partners, LLC | Palestine, TX 75803 | Oil Operator | Apr 2024 |
| 66 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |