| 1 | 1776 Energy Operators, LLC | Houston, TX 77070 | Oil & Gas Operator | May 2025 |
| 2 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | May 2025 |
| 3 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 4 | 801 LLC | Artesia, NM 88211 | Oil & Gas Operator | Oct 2023 |
| 5 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | May 2025 |
| 6 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 7 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 8 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | May 2025 |
| 9 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 10 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 11 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 12 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 13 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 14 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 15 | American Shoreline, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 16 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 17 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 18 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 19 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 20 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 21 | Apex Resources Inc | Allison Park, PA 15101-3838 | Oil & Gas Operator | Dec 1993 |
| 22 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 23 | Ashby, Andrew M. | Golden, CO 80401 | Oil & Gas Operator | Jul 1998 |
| 24 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 25 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 26 | Av-Tech Resources Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2022 |
| 27 | Bandera Eagle Ford, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 28 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 29 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | May 2025 |
| 30 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 31 | Battlecat Operating Company, LLC | Houston, TX 77082 | Oil & Gas Operator | Jul 2019 |
| 32 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 33 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | May 2025 |
| 34 | Bayshore Exploration LLC | Bellville, TX 77418 | Oil & Gas Operator | Dec 2016 |
| 35 | Baytex Energy USA, Inc. | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 36 | Beachtex Oil Company, LLC | San Antonio, TX 78257 | Oil & Gas Operator | May 2025 |
| 37 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | May 2025 |
| 38 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 39 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 40 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 41 | Black Gold Operating Co, LLC | Plntersville, TX 77363 | Oil & Gas Operator | May 2025 |
| 42 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 43 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | May 2025 |
| 44 | Blue Marble Resources Op, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2019 |
| 45 | Botasch Operating, LLC | Dilley, TX 78017 | Oil & Gas Operator | May 2025 |
| 46 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 47 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 48 | Brazos Resources, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Dec 1998 |
| 49 | Brinkoeter Gas & Oil | Converse, TX 78109 | Oil & Gas Operator | Aug 2004 |
| 50 | Brown, C. Douglas, LLC | Dallas, TX 75209 | Oil & Gas Operator | Dec 2005 |
| 51 | Brymer, Jack Contr. Serv. | George West, TX 78022 | Oil Operator | May 2025 |
| 52 | Buffalo Oil Corp. | Cotulla, TX 78014 | Oil & Gas Operator | May 2025 |
| 53 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 54 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 55 | Bush, Mark A. Oil And Gas Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 56 | Butler, Kevin O. & Assoc., Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 57 | C And S Oil & Gas | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1998 |
| 58 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 59 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 60 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 61 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 62 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 63 | Capitol Operating & Expl., Inc. | Austin, TX 78766 | Oil & Gas Operator | Feb 2001 |
| 64 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2025 |
| 65 | Caribbean Energy LLC II | Cotulla, TX 78014 | Oil & Gas Operator | May 2025 |
| 66 | Caribbean Energy, L.L.C. | Cotulla, TX 78014 | Oil & Gas Operator | Nov 2019 |
| 67 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 68 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 69 | Castlerock Ef Operating LLC | San Antonio, TX 78232 | Oil & Gas Operator | May 2025 |
| 70 | Castlerock Operating, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2020 |
| 71 | CD Resources Company | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2002 |
| 72 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 73 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 74 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 75 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 76 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 77 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 78 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 79 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 80 | Clipper Operating Co., Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 2000 |
| 81 | Coastal Investments Inc. | El Campo, TX 77437 | Oil & Gas Operator | May 2025 |
| 82 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 83 | Coastal Production Company, Inc. | El Campo, TX 77437 | Oil & Gas Operator | Aug 1995 |
| 84 | Coastal Shoreline Corp. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Aug 2003 |
| 85 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 86 | Cobbs Brothers Oil & Gas | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Jun 2009 |
| 87 | Common Resources L.L.C. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 88 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 89 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 90 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 91 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 92 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 93 | Crimson Energy Partners IV, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2023 |
| 94 | Crimson Energy Partners V, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 95 | Crown Petroleum Corp. | Oklahoma City, OK 73106 | Oil & Gas Operator | May 2025 |
| 96 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 97 | CWS Aceite Operating, Inc. | Cotulla, TX 78014 | Oil & Gas Operator | Aug 2018 |
| 98 | D90 Energy, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 99 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 100 | Dao Oil And Gas | Carrizo SPGS, TX 78834 | Oil & Gas Operator | May 2025 |