| 1 | 1776 Energy Operators, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2025 |
| 2 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | Mar 2025 |
| 3 | 3R-B Oil Venture | Luling, TX 78648 | Oil & Gas Operator | Feb 2012 |
| 4 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 5 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Mar 2025 |
| 6 | Acorn Oil & Gas, Inc. | Orchard, TX 77464 | Oil Operator | Sep 2017 |
| 7 | Acorn Oil & Gas, LLC | Iraan, TX 79744 | Oil & Gas Operator | Mar 2025 |
| 8 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2025 |
| 9 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 10 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 11 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 12 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 13 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 14 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 15 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Mar 2025 |
| 16 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 17 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 18 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 19 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 20 | Arrco Operating, LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2025 |
| 21 | Aruba Petroleum, LTD. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 22 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 23 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 24 | Av-Tech Resources Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2022 |
| 25 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Mar 2025 |
| 26 | Ayers Oil Co. | Crystal City, TX 78839 | Oil & Gas Operator | Sep 1995 |
| 27 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Mar 2025 |
| 28 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Mar 2025 |
| 29 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 30 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 31 | Baytex Energy USA, Inc. | Houston, TX 77084 | Oil & Gas Operator | Mar 2025 |
| 32 | Beachtex Oil Company, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Mar 2025 |
| 33 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Mar 2025 |
| 34 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Feb 2025 |
| 35 | Beta Oil Corporation | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2025 |
| 36 | Big Wells Energy Corp | Katy, TX 77494 | Oil & Gas Operator | Sep 2019 |
| 37 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 38 | Black Gold Operating Co, LLC | Plntersville, TX 77363 | Oil & Gas Operator | Mar 2025 |
| 39 | Black Mountain STX I LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 40 | Black Resources, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Mar 2008 |
| 41 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 42 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Mar 2025 |
| 43 | Blue Star Energy, Inc. | Shawnee, OK 74802 | Oil & Gas Operator | Mar 2025 |
| 44 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Mar 2025 |
| 45 | Botasch Operating, LLC | Dilley, TX 78017 | Oil & Gas Operator | Mar 2025 |
| 46 | BP Products North America Inc | Chicago, IL 60606 | Gas Operator | Jan 2017 |
| 47 | Brahman Oil & Gas, LLC | Houston, TX 77063 | Oil & Gas Operator | Mar 2025 |
| 48 | Bronco Z Production | San Antonio, TX 78217 | Oil & Gas Operator | Jul 1998 |
| 49 | Brymer Contracting Incorporated | Pleasanton, TX 78064 | Oil & Gas Operator | Mar 2025 |
| 50 | Brymer, Jack Contr. Serv. | George West, TX 78022 | Oil Operator | Mar 2025 |
| 51 | Buffalo Oil Corp. | Cotulla, TX 78014 | Oil & Gas Operator | Mar 2025 |
| 52 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 53 | Bush, Mark A. Oil And Gas Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 54 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | Mar 2025 |
| 55 | Caliente Oil LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Mar 2025 |
| 56 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 57 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 58 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 59 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Feb 2024 |
| 60 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 61 | Carrizo Exploration, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2016 |
| 62 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 63 | Catarina Petroleum L. C. | Dallas, TX 75228 | Oil & Gas Operator | Jun 2008 |
| 64 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Mar 2025 |
| 65 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 66 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 67 | Chapco, Inc. | Benavides, TX 78341 | Oil & Gas Operator | Mar 2025 |
| 68 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 69 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 70 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2025 |
| 71 | Chisholm Oil & Gas, LC | Buda, TX 78610 | Oil & Gas Operator | Mar 2025 |
| 72 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 73 | Civron Petroleum Res., LLC | San Antonio, TX 78229 | Oil & Gas Operator | Mar 2025 |
| 74 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Mar 2025 |
| 75 | CLS Interests, Incorporated | Austin, TX 78734 | Oil & Gas Operator | Jan 1997 |
| 76 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 77 | CMR Energy, L.P. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 78 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 79 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 80 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 81 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |
| 82 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 83 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 84 | Colt Operating Corporation | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 85 | Columbia Energy Properties, Inc. | Baytown, TX 77521 | Oil & Gas Operator | Jul 2004 |
| 86 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 87 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 88 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 89 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Mar 2025 |
| 90 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 91 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 92 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 93 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 94 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 95 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 96 | Crimson Energy Partners IV, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2023 |
| 97 | Crimson Energy Partners, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2009 |
| 98 | Crimson Energy PTNRS III, L.L.C. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 99 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 100 | Cuatro Petro Corp. | Richardson, TX 75080 | Oil & Gas Operator | Mar 2025 |