| 1 | Aeon Operating, Inc. | Fate, TX 75132 | Oil & Gas Operator | May 2025 |
| 2 | Akg Operating Company | Austin, TX 78701 | Oil & Gas Operator | May 2025 |
| 3 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 4 | Allied Operating Texas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 5 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 6 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 7 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 9 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 10 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 11 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2025 |
| 12 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 13 | Arledge, Terry | Rockdale, TX 76567 | Oil & Gas Operator | Sep 2019 |
| 14 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 15 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 16 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 17 | B J Resources, L.L.C. | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 18 | Baker, Brent Oil & Gas, Inc. | Oklahoma City, OK 73149 | Oil & Gas Operator | May 2025 |
| 19 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 20 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 21 | BBL Operating Company LLC | Colleyville, TX 76034 | Oil & Gas Operator | May 2025 |
| 22 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 23 | Blue Star Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 24 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 25 | Bralex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | May 2025 |
| 26 | Brammer Supply Inc | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2014 |
| 27 | Brazos Valley Operating, LLC | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 28 | Buffalo Xxii Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 29 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 30 | Burns Production Corporation | Midland, TX 79701 | Oil & Gas Operator | Jul 2008 |
| 31 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | May 2025 |
| 32 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 33 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 34 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 35 | Cashco, L.L.C. | Houston, TX 77024 | Oil & Gas Operator | Jul 1999 |
| 36 | Centex Energy, LLC | Bryan, TX 77802 | Oil & Gas Operator | May 2025 |
| 37 | Chalker Energy Management,LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 38 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 39 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 40 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 41 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 42 | Cheyenne Minerals, Inc. | Houston, TX 77030 | Oil & Gas Operator | Jun 2001 |
| 43 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 44 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 45 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 46 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 47 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 48 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 49 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 50 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 51 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 52 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 53 | Contract Oil & Gas Service Co. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2007 |
| 54 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 55 | Crimson Exploration Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2006 |
| 56 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 57 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 58 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 59 | Deep Rock Resources, Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 60 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 61 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Apr 2025 |
| 62 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |
| 63 | Drill Partners Management, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2010 |
| 64 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | May 2025 |
| 65 | Dynamic Petroleum Res., Inc. | Houston, TX 77068 | Oil & Gas Operator | Jul 1994 |
| 66 | Eagle Valley Development LLC | Austin, TX 78738 | Oil & Gas Operator | Oct 2023 |
| 67 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 68 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 69 | Elk Energy Holdings LLC | Wichita, KS 67226 | Oil & Gas Operator | Jan 2025 |
| 70 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 71 | Energy & Expl. PRTNRS Oper., LP | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2016 |
| 72 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 73 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 74 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 75 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 76 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 77 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 78 | Evolution Operating Co., Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2025 |
| 79 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 80 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 81 | F.I.G. Energy, LLC | Livingston, TX 77399 | Oil & Gas Operator | May 2025 |
| 82 | Forcenergy Onshore Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 83 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 84 | Fuji Resources Production Co,Inc | Houston, TX 77036 | Oil & Gas Operator | Feb 2000 |
| 85 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 86 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | May 2025 |
| 87 | Galloway Energy Co. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 88 | Gemini Exploration Company | Dallas, TX 75219 | Oil & Gas Operator | Mar 1997 |
| 89 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 90 | Gsi Oil & Gas, Inc. | Bryan, TX 77806 | Oil & Gas Operator | May 2025 |
| 91 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 92 | Heisey Ventures, Inc. | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 93 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 94 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 95 | Hewitt, Robert J. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2004 |
| 96 | High Chapparal Oil Company | Plntersville, TX 77363 | Oil & Gas Operator | Aug 2003 |
| 97 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 98 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 99 | Holley Oil Company, LLC | Chappell Hill, TX 77426 | Oil & Gas Operator | May 2025 |
| 100 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |