| 1 | 3D Oil Company, LLC | Corpus Chrsti, TX 78406 | Oil & Gas Operator | Mar 2025 |
| 2 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 3 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 4 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Mar 2025 |
| 5 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 6 | Advantage Oil & Gas, Inc. | Pinehurst, TX 77362 | Oil & Gas Operator | Mar 2025 |
| 7 | Akers, Bill | Hebbronville, TX 78361 | Oil & Gas Operator | Aug 2003 |
| 8 | Alacia Operating Company | Freer, TX 78357 | Oil & Gas Operator | Mar 2025 |
| 9 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 10 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Mar 2025 |
| 11 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 12 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 13 | Allen Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jun 2016 |
| 14 | Alliance Resources Corporation | Dallas, TX 75367 | Oil & Gas Operator | Mar 2025 |
| 15 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 16 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 17 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 18 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 19 | Amazon Royalties, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Mar 2025 |
| 20 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 21 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 22 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 23 | American Shoreline, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 24 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 25 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2024 |
| 26 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 27 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 28 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 29 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 30 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 31 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Mar 2025 |
| 32 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Mar 2025 |
| 33 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 34 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 35 | Arcturus Operating Company | Addison, TX 75001 | Oil & Gas Operator | Mar 2025 |
| 36 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 37 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 38 | Arriola Operating & Consltg Inc. | Dallas, TX 75248 | Oil Operator | Mar 2025 |
| 39 | Ascent Energy, Inc | McKinney, TX 75069 | Oil & Gas Operator | Nov 2008 |
| 40 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 41 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 42 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 43 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 44 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Mar 2025 |
| 45 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 46 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Mar 2025 |
| 47 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Mar 2025 |
| 48 | Axio Production Company, L.P. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2006 |
| 49 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Mar 2025 |
| 50 | B & R Operating, LLC | San Angelo, TX 76903 | Oil & Gas Operator | Jan 2007 |
| 51 | B.P. Productions Inc. | Victoria, TX 77904 | Oil & Gas Operator | Mar 2025 |
| 52 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 53 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 54 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 55 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 56 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 57 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Mar 2025 |
| 58 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 59 | Bennett, M. Troy, Jr. | Freer, TX 78357 | Oil & Gas Operator | Mar 2025 |
| 60 | Berg Laney & Brown | Smackover, AR 71762 | Oil & Gas Operator | Jul 1995 |
| 61 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 62 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 63 | Big Shell Oil & Gas, Inc. | Taft, TX 78390 | Oil & Gas Operator | Mar 2025 |
| 64 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 65 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 66 | Black Bayou Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 67 | Black Gold Operating Co, LLC | Plntersville, TX 77363 | Oil & Gas Operator | Mar 2025 |
| 68 | Black Gold Petroleum, LLC | Alice, TX 78333 | Oil Operator | Mar 2025 |
| 69 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 70 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Mar 2025 |
| 71 | Blue Wing Energy, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 72 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 73 | Bluestone Natural Resources, LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2015 |
| 74 | BNP Petroleum Corporation | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Mar 2025 |
| 75 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 76 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 77 | Bralex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Mar 2025 |
| 78 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 79 | Brammer Supply Inc | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2014 |
| 80 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 81 | Brayton Operating Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Sep 2009 |
| 82 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2024 |
| 83 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 84 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 85 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 86 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 87 | Bronco Z Production | San Antonio, TX 78217 | Oil & Gas Operator | Jul 1998 |
| 88 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 89 | Brown, H. L., Jr. | Midland, TX 79702 | Oil & Gas Operator | May 2002 |
| 90 | Brush Country Energy, L.L.C. | Reno, NV 89503 | Oil & Gas Operator | Nov 1998 |
| 91 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | Mar 2025 |
| 92 | Buffalo Oil Corp. | Cotulla, TX 78014 | Oil & Gas Operator | Mar 2025 |
| 93 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 94 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 95 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 96 | C & B Production | Ben Bolt, TX 78342 | Oil & Gas Operator | Mar 2025 |
| 97 | C And S Oil & Gas | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1998 |
| 98 | C. M. Oil Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2016 |
| 99 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 100 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |