| 1 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Apr 2024 |
| 2 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2024 |
| 3 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 4 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2024 |
| 5 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Apr 2024 |
| 6 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 7 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 8 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 9 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 10 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 11 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 12 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 13 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Apr 2024 |
| 14 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 15 | Arledge, Terry | Rockdale, TX 76567 | Oil & Gas Operator | Sep 2019 |
| 16 | Atkins Oil L.C. | Conroe, TX 77303 | Oil Operator | Apr 2024 |
| 17 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2024 |
| 18 | B.W.O.C., Inc. | Plano, TX 75026 | Oil & Gas Operator | Apr 2024 |
| 19 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Apr 2024 |
| 20 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 21 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 22 | Baytex Energy USA, Inc. | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 23 | BBL Operating Company LLC | Colleyville, TX 76034 | Oil & Gas Operator | Apr 2024 |
| 24 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 25 | Benco Energy Inc | Tionesta, PA 16353-5851 | Oil & Gas Operator | Dec 2002 |
| 26 | Blue Star Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 27 | Bo-MC Resources Corporation | Enid, OK 73702-1765 | Oil & Gas Operator | Apr 2005 |
| 28 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 29 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2024 |
| 30 | Broughton Operating Corp. | Pittsburgh, PA 15219 | Oil & Gas Operator | Nov 2000 |
| 31 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 32 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2024 |
| 33 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 34 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Apr 2024 |
| 35 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Apr 2024 |
| 36 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 37 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Apr 2024 |
| 38 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 39 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2018 |
| 40 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 41 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2024 |
| 42 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2023 |
| 43 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 44 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 45 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 46 | Comstock Oil & Gas, LLC | Frisco, TX 75034 | Oil & Gas Operator | Apr 2024 |
| 47 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 48 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2024 |
| 49 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 50 | Covey Park Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2019 |
| 51 | CRD Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2021 |
| 52 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2024 |
| 53 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 54 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 55 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2023 |
| 56 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 57 | Delaware Ecco Petroleum Inc. | Rockwall, TX 75087 | Oil & Gas Operator | Jul 2001 |
| 58 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 59 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 60 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 61 | Diversified Production LLC | Minden, LA 71055 | Oil & Gas Operator | Apr 2024 |
| 62 | Dorfman Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 63 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |
| 64 | DPMP Energy LLC | Prosper, TX 75078 | Oil & Gas Operator | Dec 2023 |
| 65 | Dynamic Petroleum Res., Inc. | Houston, TX 77068 | Oil & Gas Operator | Jul 1994 |
| 66 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 67 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Apr 2024 |
| 68 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 69 | Edf Trading Resources, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2015 |
| 70 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 71 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 72 | Enbridge Pipelines (Ne Texas) LP | Houston, TX 77002 | Oil & Gas Operator | Jan 2010 |
| 73 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 74 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Jan 2024 |
| 75 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 76 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 77 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 78 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 79 | Et Gathering & Processing LLC | San Antonio, TX 78258 | Oil Operator | Dec 2023 |
| 80 | Etc Texas Pipeline, LTD. | San Antonio, TX 78258 | Oil Operator | Sep 2023 |
| 81 | Exploration Techniques Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 82 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Nov 2023 |
| 83 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Apr 2024 |
| 84 | First Aransas Reserves, Inc. | Alvin, TX 77511 | Oil & Gas Operator | Mar 2018 |
| 85 | Fletcher Operating, LLC | Fairhope, AL 36533 | Oil & Gas Operator | Apr 2024 |
| 86 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 87 | Fossil Operating, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Apr 2024 |
| 88 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 89 | Gastar Exploration Texas, LP | Houston, TX 77010 | Oil & Gas Operator | Oct 2018 |
| 90 | Geosouthern Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2024 |
| 91 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 92 | Gunn Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 93 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 94 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 95 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 96 | Hawkwood Energy Operating, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 97 | Henry, John Petroleum | Dallas, TX 75225 | Oil & Gas Operator | Dec 2001 |
| 98 | Herd Producing Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 99 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Apr 2024 |
| 100 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Apr 2024 |