| 1 | 360 Mining, Inc. | Austin, TX 78701 | Gas Operator | May 2025 |
| 2 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 3 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 4 | Afe Oil & Gas Consultants | Addison, TX 75001 | Gas Operator | Jan 2003 |
| 5 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 6 | Antero Resources I, LP | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 7 | Apco Oil Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 1993 |
| 8 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Mar 2025 |
| 9 | Arabella Petroleum Company, LLC | Austin, TX 78701 | Oil & Gas Operator | May 2025 |
| 10 | Argali Resources | Dallas, TX 75206 | Oil & Gas Operator | Apr 2003 |
| 11 | Arp Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 12 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 13 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 14 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | May 2025 |
| 15 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 16 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 17 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 18 | Bagby Energy LLC | Fort Smith, AR 72913 | Gas Operator | Apr 2010 |
| 19 | Beacon E&P Company, LLC | Denver, CO 80202 | Gas Operator | Feb 2016 |
| 20 | Bedrock Production, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 21 | BKV Barnett, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 22 | BKV North Texas, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 23 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 24 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 25 | Blue Creek Inc | Fort Worth, TX 76181 | Oil & Gas Operator | Dec 2002 |
| 26 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 27 | Bonfire Operating LLC | Cresson, TX 76035 | Oil & Gas Operator | May 2025 |
| 28 | Bowerman Investments Inc. | Arlington, TX 76003 | Oil & Gas Operator | May 2025 |
| 29 | Bowerman Oil & Gas, Inc. | Arlington, TX 76003 | Oil & Gas Operator | May 2025 |
| 30 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 31 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | May 2025 |
| 32 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 33 | Briley Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 34 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 35 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 36 | C & M Exploration LLC | Tulsa, OK 74159-1331 | Oil & Gas Operator | Jun 2014 |
| 37 | C S Petroleum Inc | Norman, OK 73070 | Oil & Gas Operator | Dec 2024 |
| 38 | Canan Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 39 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 40 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 41 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | May 2025 |
| 42 | Centaur Petroleum Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | May 2025 |
| 43 | CH4 Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2006 |
| 44 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 45 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 46 | Chief Oil & Gas LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2022 |
| 47 | Chief Operating LLC | Dallas, TX 75225 | Gas Operator | Mar 2009 |
| 48 | Circle Ridge Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 49 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 50 | Crow Creek Operating Co II LLC | Houston, TX 77252 | Oil & Gas Operator | Jul 2011 |
| 51 | Cso Consulting | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2020 |
| 52 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 53 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | May 2025 |
| 54 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 55 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 56 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 57 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 58 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 59 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 60 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 61 | Dunlap Exploration, Inc. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2016 |
| 62 | Dunn Resources, LLC | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2023 |
| 63 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 64 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 65 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | Feb 2025 |
| 66 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 67 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 68 | Edge Barnett Operating Comp LLC | Fort Worth, TX 76107 | Gas Operator | Nov 2013 |
| 69 | Edge Resources Operating, L.L.C. | Fort Worth, TX 76107 | Gas Operator | Jan 2020 |
| 70 | Elk Energy Holdings LLC | Wichita, KS 67226 | Oil & Gas Operator | Jan 2025 |
| 71 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 72 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 73 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 74 | Energy From Texas, L. P. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2013 |
| 75 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 76 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 77 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 78 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 79 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 80 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | May 2025 |
| 81 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 82 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | May 2025 |
| 83 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 84 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 85 | Four Sevens Oil Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 86 | Four Sevens Operating Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 87 | Frost Brothers Resources, LLLP | Fort Worth, TX 76101 | Gas Operator | Nov 2024 |
| 88 | Gas Tap Corp. | Plano, TX 75075 | Gas Operator | May 2025 |
| 89 | Gha Barnett, LLC | Irving, TX 75062 | Gas Operator | May 2025 |
| 90 | Grace 7 Properties, LTD. | Argyle, TX 76226 | Oil & Gas Operator | May 2025 |
| 91 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 92 | Gulf South Pipeline Company, LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2020 |
| 93 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 94 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 95 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 96 | Harris Energy Services, LLC | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 97 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 98 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 99 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 100 | Home-Stake Oil & Gas Company | Plano, TX 75093 | Oil & Gas Operator | Feb 2025 |