| 1 | 12TH Man Energy, LLC | Houston, TX 77069 | Oil & Gas Operator | Apr 2024 |
| 2 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2024 |
| 3 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 4 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 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 | Apr 2024 |
| 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 | Apr 2024 |
| 9 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Apr 2024 |
| 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 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2024 |
| 13 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 14 | Alpha Oil & Gas LLC | Austin, TX 78734 | Gas Operator | Apr 2024 |
| 15 | Alpha Omega Petroleum, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 1996 |
| 16 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2024 |
| 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 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 20 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 21 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 22 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |
| 23 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 24 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 25 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 26 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 27 | Ascent Energy, Inc | McKinney, TX 75069 | Oil & Gas Operator | Nov 2008 |
| 28 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 29 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 30 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 31 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Apr 2024 |
| 32 | B & T Operating Co. | Dawson, TX 76639 | Oil & Gas Operator | Apr 2024 |
| 33 | Barnett Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 34 | Barrett Brothers Oil & Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2020 |
| 35 | Barrett Brothers Oil And Gas | San Antonio, TX 78217 | Oil & Gas Operator | Mar 1995 |
| 36 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Apr 2024 |
| 37 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 38 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 39 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | Apr 2024 |
| 40 | BDR Energy Corporation | Corpus Chrsti, TX 78463 | Oil & Gas Operator | Mar 1998 |
| 41 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 42 | Beehive Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 43 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 44 | Belco Operating Corp. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 45 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Apr 2024 |
| 46 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 47 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 48 | Big Creek Operating Company LLC | Houston, TX 77098 | Oil & Gas Operator | Apr 2024 |
| 49 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 50 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 51 | Black Gold Petroleum, LLC | Alice, TX 78333 | Oil Operator | Apr 2024 |
| 52 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 53 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 54 | BNP Petroleum Corporation | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Apr 2024 |
| 55 | BNR Operating, LLC | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 56 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Apr 2024 |
| 57 | Booher Engineering, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 58 | Boss Expl & Prod Corporation | Dallas, TX 75201 | Oil & Gas Operator | Apr 2008 |
| 59 | Boundary Ventures, Inc. | Columbus, TX 78934 | Oil Operator | Apr 2024 |
| 60 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | Apr 2024 |
| 61 | BPL Exploration, LTD. | Corpus Chrsti, TX 78418 | Oil & Gas Operator | Jan 2012 |
| 62 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 63 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2023 |
| 64 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 65 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 66 | Bruington Operating, L.L.C. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2015 |
| 67 | Bryant - Chase Energy Corp. | Tyler, TX 75701 | Oil & Gas Operator | Aug 2004 |
| 68 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | Apr 2024 |
| 69 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Apr 2024 |
| 70 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 71 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 72 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Apr 2024 |
| 73 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Apr 2024 |
| 74 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 75 | Cantera Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2017 |
| 76 | Capital Star Oil & Gas, Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 77 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 78 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 79 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 80 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 81 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Jan 2024 |
| 82 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2024 |
| 83 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2024 |
| 84 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 85 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 86 | Choctaw Resources, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Dec 2019 |
| 87 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 88 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2024 |
| 89 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 90 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 91 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 92 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Apr 2024 |
| 93 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 94 | CM TX Production, LLC | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2023 |
| 95 | CMR Energy, L.P. | Houston, TX 77077 | Oil & Gas Operator | Apr 2024 |
| 96 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 97 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Apr 2024 |
| 98 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 99 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 100 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |