| 1 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | Feb 2025 |
| 2 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2025 |
| 3 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 4 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Feb 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 | Feb 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 | Feb 2025 |
| 9 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2025 |
| 10 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 11 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Feb 2025 |
| 12 | Alcor Energy, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Feb 2025 |
| 13 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 14 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2025 |
| 15 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 16 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 17 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 18 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 19 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 20 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 21 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2025 |
| 22 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 23 | Antares Energy Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2025 |
| 24 | Aop Operating Corporation | Dallas, TX 75313 | Oil & Gas Operator | Aug 2003 |
| 25 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 26 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 27 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 28 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 29 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 30 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 31 | Atkinson Operations LLC | Three Rivers, TX 78071 | Oil Operator | Feb 2025 |
| 32 | Atkinson, Clifford III | San Antonio, TX 78217 | Oil & Gas Operator | Dec 1996 |
| 33 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2025 |
| 34 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2025 |
| 35 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Feb 2025 |
| 36 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Feb 2025 |
| 37 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Feb 2025 |
| 38 | B D Production Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2025 |
| 39 | B.P. Productions Inc. | Victoria, TX 77904 | Oil & Gas Operator | Feb 2025 |
| 40 | Bailey, L. J. | Pleasanton, TX 78064 | Oil & Gas Operator | Jul 2003 |
| 41 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 42 | Battlecat Operating Company, LLC | Houston, TX 77082 | Oil & Gas Operator | Jul 2019 |
| 43 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 44 | Bayshore Operating Co. | Ingleside, TX 78362 | Oil & Gas Operator | Mar 2009 |
| 45 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Feb 2025 |
| 46 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 47 | Bellows, Richard | Three Rivers, TX 78071 | Oil & Gas Operator | Nov 2008 |
| 48 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 49 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 50 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2025 |
| 51 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 52 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Feb 2025 |
| 53 | Blair Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2011 |
| 54 | Blair, Jack N. | Midland, TX 79702 | Oil & Gas Operator | May 1996 |
| 55 | BLS Resources, Inc. | Rosharon, TX 77583 | Oil & Gas Operator | Feb 2001 |
| 56 | Blue Wing Energy, Inc. | Portland, TX 78374 | Oil & Gas Operator | Feb 2025 |
| 57 | Bluebonnet Oil & Gas | Three Rivers, TX 78071 | Oil & Gas Operator | Feb 2025 |
| 58 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 59 | Bluestone Natural Resources, LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2015 |
| 60 | Bluestone Production Company LP | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2007 |
| 61 | BNP Petroleum Corporation | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Feb 2025 |
| 62 | Borden, Inc. | Columbus, OH 43215 | Oil & Gas Operator | Mar 1990 |
| 63 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 64 | BP Products North America Inc | Chicago, IL 60606 | Gas Operator | Jan 2017 |
| 65 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 66 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2025 |
| 67 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2024 |
| 68 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 69 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 70 | Britanco, L.L.C. | Falls City, TX 78113 | Oil & Gas Operator | Feb 2025 |
| 71 | Broad Oak Energy, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Jul 2011 |
| 72 | Brown, Russell Operator, Inc. | Alice, TX 78333 | Oil & Gas Operator | Feb 2025 |
| 73 | Brush Country Energy, L.L.C. | Reno, NV 89503 | Oil & Gas Operator | Nov 1998 |
| 74 | Brymer Contracting Incorporated | Pleasanton, TX 78064 | Oil & Gas Operator | Feb 2025 |
| 75 | Buffalo Oil Corp. | Cotulla, TX 78014 | Oil & Gas Operator | Feb 2025 |
| 76 | Bull Oil Company, LLC | Livingston, TX 77351 | Oil & Gas Operator | Feb 2025 |
| 77 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Feb 2025 |
| 78 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2025 |
| 79 | C. M. Oil Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2016 |
| 80 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 81 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 82 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 83 | Camco Saltwater Transport | George West, TX 78022 | Oil Operator | Feb 2015 |
| 84 | Camco Saltwater Transport,L.L.C. | George West, TX 78022 | Oil Operator | Feb 2025 |
| 85 | Camden Oil & Gas, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Dec 2005 |
| 86 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 87 | Camden Resources, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2015 |
| 88 | Camelot Oil And Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 89 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Feb 2025 |
| 90 | Carburante Exploration Co, LTD. | Granbury, TX 76048 | Oil & Gas Operator | Feb 2025 |
| 91 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 92 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 93 | Casa Oil And Gas Company | George West, TX 78022 | Gas Operator | Sep 2005 |
| 94 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2025 |
| 95 | Castlerock Ef Operating LLC | San Antonio, TX 78232 | Oil & Gas Operator | Feb 2025 |
| 96 | Castlerock Operating, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2020 |
| 97 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 98 | CD Resources Company | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2002 |
| 99 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Feb 2025 |
| 100 | Centex Pipe & Equipment, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2025 |