| 1 | 3-M Energy Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2017 |
| 2 | A.O.E. Operators, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Sep 2025 |
| 3 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 4 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 5 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Sep 2025 |
| 6 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Sep 2025 |
| 7 | Algoa Operating Company, LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2002 |
| 8 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Sep 2025 |
| 9 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 10 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 11 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 12 | American Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2025 |
| 13 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 14 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Sep 2025 |
| 15 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 16 | API Operating Co. | Houston, TX 77036 | Oil & Gas Operator | Sep 2025 |
| 17 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 18 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 19 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 20 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 21 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Sep 2025 |
| 22 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 23 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 24 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 25 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 26 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Sep 2025 |
| 27 | Black Water Environmental L.L.C. | Texas City, TX 77590 | Oil Operator | Sep 2025 |
| 28 | Blue Ridge Operating Company,Inc | Ashland, OR 97520 | Oil & Gas Operator | Oct 1998 |
| 29 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 30 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 31 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 32 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 33 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 34 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 35 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 36 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 37 | Capco Offshore Of Texas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 38 | Capco Offshore, Inc. | Irving, TX 75063 | Oil & Gas Operator | May 2012 |
| 39 | Capco Resources Corporation | Irving, TX 75016 | Oil & Gas Operator | Mar 2004 |
| 40 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Sep 2025 |
| 41 | Cedar Point Oil Company | Baytown, TX 77520 | Oil & Gas Operator | Aug 2003 |
| 42 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 43 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 44 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Sep 2025 |
| 45 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 46 | Chilton Energy | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Sep 2006 |
| 47 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Sep 2025 |
| 48 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 49 | Cimarex Energy Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 50 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 51 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 52 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Sep 2025 |
| 53 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 54 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 55 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 56 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2025 |
| 57 | Coastline Operating, L.L.C. | Houston, TX 77027 | Oil & Gas Operator | Dec 2006 |
| 58 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 59 | Cockburn Oil Corporation | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2005 |
| 60 | Cologne Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2014 |
| 61 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 62 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Sep 2025 |
| 63 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Sep 2025 |
| 64 | Comet Production | Conroe, TX 77305 | Oil Operator | Sep 2025 |
| 65 | Cometra Oil And Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1997 |
| 66 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 67 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 68 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 69 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 70 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 71 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 72 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 73 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2025 |
| 74 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 75 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 76 | Crossroads Energy L.P. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 77 | Crossroads Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2018 |
| 78 | Cwoc | Big Spring, TX 79721 | Oil & Gas Operator | Sep 2025 |
| 79 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 80 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Sep 2025 |
| 81 | Daniels Corporation, The | Seabrook, TX 77586 | Oil & Gas Operator | Sep 2025 |
| 82 | Dartex Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Sep 2025 |
| 83 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 84 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Sep 2025 |
| 85 | Daystar Operating Company, LLC | Austin, TX 78750 | Oil & Gas Operator | Apr 2008 |
| 86 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 87 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2025 |
| 88 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 89 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 90 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 91 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | Sep 2025 |
| 92 | Drillmar Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | Nov 2014 |
| 93 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 94 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Sep 2025 |
| 95 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 96 | El Tres Exploration | Houston, TX 77098 | Oil & Gas Operator | Mar 2008 |
| 97 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 98 | Elliott Oil & Gas Operating Co. | Magnolia, TX 77354 | Oil & Gas Operator | Sep 2025 |
| 99 | Energy Reserves Group LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2018 |
| 100 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |