| 1 | 3-M Energy Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2017 |
| 2 | 801 LLC | Artesia, NM 88211 | Oil & Gas Operator | Oct 2023 |
| 3 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2025 |
| 4 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 5 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2025 |
| 6 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 7 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Apr 2025 |
| 8 | Alyana Energy Corporation | Houston, TX 77227 | Oil & Gas Operator | Apr 1995 |
| 9 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 10 | Ambassador Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Apr 2025 |
| 11 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 12 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 13 | American Int'L Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 14 | American Pumping & Trucking | New Braunfels, TX 78131 | Oil & Gas Operator | Apr 2025 |
| 15 | Ammonite Energy Texas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2003 |
| 16 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Feb 2025 |
| 17 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 18 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 19 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 20 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 21 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 22 | Ariel Resources, Inc. | Dallas, TX 75287 | Oil & Gas Operator | May 1997 |
| 23 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 24 | Armour Resource Holdings, LTD. | Houston, TX 77046 | Oil & Gas Operator | Nov 1994 |
| 25 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 26 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 27 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 28 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2025 |
| 29 | Auburn Enterprises, Inc. | Kyle, TX 78640 | Oil & Gas Operator | Aug 2003 |
| 30 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 31 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 32 | B D Production Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 33 | B.P. Productions Inc. | Victoria, TX 77904 | Oil & Gas Operator | Apr 2025 |
| 34 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 35 | Barnes Mineral Production, LTD. | Hallettsville, TX 77964 | Oil & Gas Operator | Apr 2025 |
| 36 | Barrier Resources LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Aug 2003 |
| 37 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Apr 2025 |
| 38 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 39 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 40 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2025 |
| 41 | Baytex Energy USA, Inc. | Houston, TX 77084 | Oil & Gas Operator | Apr 2025 |
| 42 | Bell, Kelly Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1995 |
| 43 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Apr 2025 |
| 44 | Benchmark Oil & Gas Co. | Houston, TX 77282 | Oil & Gas Operator | Apr 2025 |
| 45 | Benchmark Texas Petroleum, LLC. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 46 | Bepco, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2008 |
| 47 | Big "6" Drilling Company | Houston, TX 77063 | Oil & Gas Operator | Mar 2019 |
| 48 | Big Lake Corporation | Dallas, TX 75222 | Oil & Gas Operator | Apr 2025 |
| 49 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Apr 2025 |
| 50 | Bishop, J. E., Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2012 |
| 51 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2025 |
| 52 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 53 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Apr 2025 |
| 54 | Blue Wing Energy, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2025 |
| 55 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 56 | Bomar Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2020 |
| 57 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 58 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 59 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2025 |
| 60 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 61 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 62 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 63 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 64 | Brightspot Operating LLC | Katy, TX 77494 | Oil & Gas Operator | Apr 2025 |
| 65 | Brinkerhoff, Bob | Houston, TX 77257 | Gas Operator | Feb 1994 |
| 66 | Britanco, L.L.C. | Falls City, TX 78113 | Oil & Gas Operator | Apr 2025 |
| 67 | Broad Oak Energy, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Jul 2011 |
| 68 | Brown J K Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2003 |
| 69 | Brown, Geo. R Partnership,LP,The | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 70 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 71 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | Apr 2025 |
| 72 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2025 |
| 73 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 74 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 75 | Burton, V.C. Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2016 |
| 76 | C.F.O., Inc. | Liberty, TX 77575 | Oil Operator | Apr 2025 |
| 77 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 78 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 79 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Apr 2025 |
| 80 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 81 | Camden Oil & Gas, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Dec 2005 |
| 82 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 83 | Camden Resources, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2015 |
| 84 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Apr 2025 |
| 85 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2025 |
| 86 | Cantera Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2017 |
| 87 | Canyon Oil & Gas Exploration LLC | San Antonio, TX 78258 | Oil & Gas Operator | May 2002 |
| 88 | Capital Star Oil & Gas, Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2025 |
| 89 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 90 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2025 |
| 91 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 92 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 93 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Apr 2025 |
| 94 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 95 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2025 |
| 96 | Central Gulf Petroleum Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2025 |
| 97 | Centurion Exploration Company | Houston, TX 77042 | Oil & Gas Operator | May 2009 |
| 98 | Cerberus Engineering, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 99 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 100 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2025 |