| 1 | A. Michael Hyde Oil & Gas Co. | | Oil & Gas Operator | Jan 1989 |
| 2 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 3 | Amax Oil & Gas Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 4 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 5 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 6 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 7 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 8 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 9 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 10 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 11 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 12 | B & D Operating Company | | Oil & Gas Operator | Apr 1990 |
| 13 | Baker Petroleum Corporation | | Gas Operator | Dec 1995 |
| 14 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 15 | Bass-Franks | | Oil & Gas Operator | Jun 1997 |
| 16 | Bayou South Gas Gather. Co L C | | Oil Operator | Oct 2002 |
| 17 | Bepco, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2008 |
| 18 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 19 | Beusa Energy, LLC | | Oil & Gas Operator | Nov 2017 |
| 20 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 21 | Bill Foster | | Oil Operator | Dec 2024 |
| 22 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 23 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 24 | Brammer-Keystone Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 25 | Bridas Energy USA, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Aug 2008 |
| 26 | Brighton Energy, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 27 | Broco Oil, LP | | Oil & Gas Operator | Nov 2024 |
| 28 | Broyles-Wheless Industries Inc | | Oil & Gas Operator | Apr 1993 |
| 29 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 30 | C. H. C. Gerard | | Oil & Gas Operator | Jan 2025 |
| 31 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Feb 2026 |
| 32 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 33 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 34 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 35 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 36 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 37 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 38 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 39 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 40 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 41 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 42 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 43 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 44 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 45 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 46 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 47 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 48 | Conquest Exploration Co. | | Oil & Gas Operator | Mar 1992 |
| 49 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 50 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 51 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 52 | CSC Energy Corp. | | Oil & Gas Operator | Dec 2009 |
| 53 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 54 | D&S Oil & Gas Operators, Inc. | | Oil & Gas Operator | Dec 2020 |
| 55 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 56 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 57 | David Crow | | Oil & Gas Operator | Nov 1985 |
| 58 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 59 | Dean Petroleum | | Oil & Gas Operator | Jun 2000 |
| 60 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 61 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 62 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 63 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 64 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 65 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 66 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 67 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 68 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 69 | Empresa Energy IV, LLC | | Oil & Gas Operator | Aug 2019 |
| 70 | Empresa Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 71 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 72 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 73 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 74 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 75 | Engeo Co. | | Oil & Gas Operator | Nov 1986 |
| 76 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 77 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 78 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 79 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 80 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 81 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 82 | F H Walsh Jr Operating Co Inc | | Oil & Gas Operator | Jul 1995 |
| 83 | F W Rabalais, Inc. | | Oil & Gas Operator | Dec 2014 |
| 84 | F.S.M. Oil Co. | | Oil Operator | Aug 1979 |
| 85 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 86 | Fite Oil & Gas, Inc. | Shreveport, LA 71163 | Oil & Gas Operator | Feb 2026 |
| 87 | Fontainebleau Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 88 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 89 | Foster-Brown Operations, Inc. | | Oil & Gas Operator | Apr 2003 |
| 90 | Franks & Bass Et Al | | Oil & Gas Operator | Sep 1989 |
| 91 | Franks & Broyles Et Al | | Oil & Gas Operator | Sep 1989 |
| 92 | Franks Operating Company, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 93 | Franks Petroleum, Inc. Et Al | | Oil & Gas Operator | Oct 1989 |
| 94 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 95 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 96 | Goldco Operating LLC | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 97 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 98 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 99 | Goodrich-Anderson | | Oil & Gas Operator | Jul 1988 |
| 100 | GPM, Inc. | | Oil & Gas Operator | Jun 1994 |