| 1 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | May 2025 |
| 2 | A.O.E. Operators, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | May 2025 |
| 3 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 4 | Accidie Exploration And Dev.,Inc | Plano, TX 75023 | Oil & Gas Operator | May 2025 |
| 5 | Ace Productions | Beaumont, TX 77707 | Oil & Gas Operator | May 2025 |
| 6 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 7 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | May 2025 |
| 8 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 9 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 10 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | May 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 | May 2025 |
| 13 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 14 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 15 | Amazon Royalties, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | May 2025 |
| 16 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 17 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 18 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 19 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 20 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 21 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 22 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 23 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 24 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 25 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 26 | Apb Oil Corporation | Houston, TX 77052 | Oil & Gas Operator | Apr 1996 |
| 27 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 28 | Arista Novelty, Inc. | Houston, TX 77256 | Oil & Gas Operator | Feb 1995 |
| 29 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 30 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 31 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 32 | Bagley, Roy | Magnolia, TX 77354 | Oil & Gas Operator | May 2025 |
| 33 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 34 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 35 | Beckham Resources, Inc. | Houston, TX 77010 | Oil & Gas Operator | Mar 2011 |
| 36 | Bennett, Mills Estate | Houston, TX 77057 | Oil & Gas Operator | Sep 1995 |
| 37 | Big Easy Operating Company | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 38 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 39 | Bledsoe Petro Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2000 |
| 40 | Blue Duck Corporation | Mont Belvieu, TX 77580 | Oil & Gas Operator | Sep 2011 |
| 41 | Boothe Oil Company | Batson, TX 77519 | Oil & Gas Operator | Feb 2014 |
| 42 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 43 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | May 2025 |
| 44 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 45 | Brandes Petroleum, B.P.C.,Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 46 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 47 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 48 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 49 | Brown, Al A. | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 50 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 51 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 52 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 53 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | May 2025 |
| 54 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 55 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | May 2025 |
| 56 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 57 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 58 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 59 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 60 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | May 2025 |
| 61 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | May 2025 |
| 62 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Mar 2025 |
| 63 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 64 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 65 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 66 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | May 2025 |
| 67 | CBN Operating Corp. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 68 | Cedar Point Oil Company | Baytown, TX 77520 | Oil & Gas Operator | Aug 2003 |
| 69 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Feb 2025 |
| 70 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 71 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | May 2025 |
| 72 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 73 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 74 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | May 2025 |
| 75 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 76 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 77 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 78 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 79 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 80 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | May 2025 |
| 81 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 82 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 83 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 84 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 85 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 86 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 87 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 88 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 89 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 90 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 91 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 92 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 93 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 94 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 95 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 96 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 97 | Crude Production Company | Clyde, TX 79510 | Oil & Gas Operator | May 2025 |
| 98 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 99 | CWC Oil & Gas, LLC | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 100 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |