| 1 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | Oct 2025 |
| 2 | 31 Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 3 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 4 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2025 |
| 5 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 6 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Oct 2025 |
| 7 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 8 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 9 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 10 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 11 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 12 | Alexander Production Company | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2021 |
| 13 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 14 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Oct 2025 |
| 15 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 16 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 17 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 18 | American Shoreline, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 19 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 20 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Oct 2025 |
| 21 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 22 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 23 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 24 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 25 | Anderson Petro-Equipment, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Oct 2025 |
| 26 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 27 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 28 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Oct 2025 |
| 29 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 30 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 31 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 32 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 33 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 34 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 35 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 36 | Atkinson, Clifford III | San Antonio, TX 78217 | Oil & Gas Operator | Dec 1996 |
| 37 | Auburn Enterprises, Inc. | Kyle, TX 78640 | Oil & Gas Operator | Aug 2003 |
| 38 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 39 | Aurora USA Development, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 40 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 41 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Oct 2025 |
| 42 | B & G Energy Corporation | Dallas, TX 75214 | Oil & Gas Operator | Oct 2025 |
| 43 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Oct 2025 |
| 44 | B D Production Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 45 | Bagley, Roy | Magnolia, TX 77354 | Oil & Gas Operator | Oct 2025 |
| 46 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 47 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 48 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Oct 2025 |
| 49 | Baytex USA Development, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2017 |
| 50 | BB-Southtex, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2024 |
| 51 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 52 | Beachtex Oil Company, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Oct 2025 |
| 53 | Beckham Resources, Inc. | Houston, TX 77010 | Oil & Gas Operator | Mar 2011 |
| 54 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Oct 2025 |
| 55 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 56 | Bellows, Richard | Three Rivers, TX 78071 | Oil & Gas Operator | Nov 2008 |
| 57 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 58 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Oct 2025 |
| 59 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 60 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 61 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 62 | Bissell Operating LLC | San Antonio, TX 78216 | Oil Operator | Oct 2016 |
| 63 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 64 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2025 |
| 65 | Blue Wing Energy, Inc. | Portland, TX 78374 | Oil & Gas Operator | Oct 2025 |
| 66 | Bluebonnet Oil & Gas | Three Rivers, TX 78071 | Oil & Gas Operator | Oct 2025 |
| 67 | Bluestone Natural Resources, LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2015 |
| 68 | BNP Petroleum Corporation | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Oct 2025 |
| 69 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Oct 2025 |
| 70 | Botasch Operating, LLC | Dilley, TX 78017 | Oil & Gas Operator | Oct 2025 |
| 71 | Boundary Ventures, Inc. | Columbus, TX 78934 | Oil Operator | Oct 2025 |
| 72 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 73 | BPL Exploration, LTD. | Corpus Chrsti, TX 78418 | Oil & Gas Operator | Jan 2012 |
| 74 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 75 | Brammer Supply Inc | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2014 |
| 76 | Brander, Sam H. | San Antonio, TX 78264 | Oil & Gas Operator | Oct 2025 |
| 77 | Brayton Operating Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Sep 2009 |
| 78 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 79 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 80 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 81 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 82 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 83 | Bright North Explorations LTD. | Canada, 00100 | Oil & Gas Operator | Oct 2025 |
| 84 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 85 | Britanco, L.L.C. | Falls City, TX 78113 | Oil & Gas Operator | Oct 2025 |
| 86 | Brown, C. Douglas, LLC | Dallas, TX 75209 | Oil & Gas Operator | Dec 2005 |
| 87 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 88 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 89 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 90 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 91 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 92 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Oct 2025 |
| 93 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | Oct 2025 |
| 94 | C & E Oil Company | Corpus Christi, TX 78418 | Oil Operator | Jan 1989 |
| 95 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Oct 2025 |
| 96 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 97 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 98 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 99 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Oct 2025 |
| 100 | Camco Saltwater Transport | George West, TX 78022 | Oil Operator | Feb 2015 |