| 1 | 1776 Energy Operators, LLC | Houston, TX 77070 | Oil & Gas Operator | May 2025 |
| 2 | 1836 Resources, LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2019 |
| 3 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | May 2025 |
| 4 | 3R-B Oil Venture | Luling, TX 78648 | Oil & Gas Operator | Feb 2012 |
| 5 | Acme Petroleum Co. | Gonzales, TX 78629 | Oil & Gas Operator | Mar 2008 |
| 6 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | May 2025 |
| 7 | Aegis Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Sep 1998 |
| 8 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 9 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 10 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 11 | Ames Oil Corporation Of Texas | Austin, TX 78720 | Oil & Gas Operator | Mar 2015 |
| 12 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 13 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 14 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 15 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 16 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 17 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 18 | Argent Petroleum Corporation | Center, TX 75935 | Oil & Gas Operator | May 2025 |
| 19 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 20 | Atlas Fuel Supply, LTD. | Houston, TX 77269 | Oil Operator | May 2025 |
| 21 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 22 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 23 | Auterra Operating, LLC | Friendswood, TX 77546 | Oil & Gas Operator | May 2025 |
| 24 | Av-Tech Resources Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2022 |
| 25 | B. J. P. Operating | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 26 | Baker, Brent Oil & Gas, Inc. | Oklahoma City, OK 73149 | Oil & Gas Operator | May 2025 |
| 27 | Barnes Exploration Co. | Nashville, TN 37209 | Oil & Gas Operator | Feb 1995 |
| 28 | Barnett Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | May 2025 |
| 29 | Barnhart Co LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 30 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 31 | Baron Energy Inc. | San Marcos, TX 78666 | Oil & Gas Operator | May 2025 |
| 32 | Bastrop Energy Group | San Antonio, TX 78231 | Oil & Gas Operator | May 2025 |
| 33 | Battlecat Oil & Gas, LLC | Houston, TX 77082 | Oil & Gas Operator | Jul 2017 |
| 34 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 35 | Baytex Energy USA, Inc. | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 36 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 37 | Bedford Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 38 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | May 2025 |
| 39 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 40 | Benson Mineral Group Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2022 |
| 41 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Apr 2025 |
| 42 | Bex, Inc. | Nashville, TN 37209 | Oil & Gas Operator | Aug 2007 |
| 43 | Big Wells Energy Corp | Katy, TX 77494 | Oil & Gas Operator | Sep 2019 |
| 44 | Black Jack Services, L.L.C. | Bastrop, TX 78602 | Oil & Gas Operator | May 2025 |
| 45 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 46 | Blanco Oil Co. | San Antonio, TX 78230 | Oil & Gas Operator | Feb 2004 |
| 47 | Bledsoe, R.K. Trust Oil Operator | Jourdanton, TX 78026 | Oil & Gas Operator | May 2025 |
| 48 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | May 2025 |
| 49 | Boundary Ventures, Inc. | Columbus, TX 78934 | Oil Operator | May 2025 |
| 50 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 51 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | May 2025 |
| 52 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 53 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 54 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 55 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 56 | Brothers Oil & Equipment, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 57 | Brown, C. Douglas, LLC | Dallas, TX 75209 | Oil & Gas Operator | Dec 2005 |
| 58 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 59 | Bruington Operating, L.L.C. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2015 |
| 60 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | May 2025 |
| 61 | Bulldog Exploration, LP | Houston, TX 77090 | Oil & Gas Operator | Apr 2011 |
| 62 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 63 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 64 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 65 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | May 2025 |
| 66 | Byrd Operating Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 67 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | May 2025 |
| 68 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | May 2025 |
| 69 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 70 | Capps, R. Oil Corp. | Midland, TX 79704 | Oil & Gas Operator | Oct 2002 |
| 71 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 72 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 73 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | May 2025 |
| 74 | Centaur Petroleum Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | May 2025 |
| 75 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 76 | Cherry Oil & Gas | Luling, TX 78648 | Oil & Gas Operator | Dec 2000 |
| 77 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 78 | Chisholm Oil Investments | Seabrook, TX 77586 | Oil & Gas Operator | May 2025 |
| 79 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 80 | Churchill Operating, LLC | Houston, TX 77007 | Oil & Gas Operator | May 2025 |
| 81 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 82 | CJ Tejas Energy, LLC | Pearland, TX 77581 | Oil Operator | May 2025 |
| 83 | CL&F Operating LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2022 |
| 84 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | May 2025 |
| 85 | CLS Interests, Incorporated | Austin, TX 78734 | Oil & Gas Operator | Jan 1997 |
| 86 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 87 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 88 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 89 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |
| 90 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 91 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 92 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 93 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 94 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 95 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 96 | Creative Oil & Gas Operating,LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2024 |
| 97 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 98 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | May 2025 |
| 99 | CWS Aceite Operating, Inc. | Cotulla, TX 78014 | Oil & Gas Operator | Aug 2018 |
| 100 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | May 2025 |