| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2025 |
| 2 | Ada Oil Exploration Corp | | Oil & Gas Operator | Jan 1986 |
| 3 | Adobe Energy Company | | Oil & Gas Operator | Aug 2010 |
| 4 | Alamo Petroleum Company | | Oil & Gas Operator | Jun 1985 |
| 5 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2012 |
| 6 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 7 | American Exploration Oper. Co. | | Oil & Gas Operator | May 1990 |
| 8 | American Explorer, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Jan 1999 |
| 9 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 10 | Anderson Exploration Co., Inc. | | Oil & Gas Operator | Sep 2023 |
| 11 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 12 | Array Operating, LLC | | Oil & Gas Operator | Mar 2017 |
| 13 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 14 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 15 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 16 | Baby Oil, Inc. | | Oil & Gas Operator | Oct 2017 |
| 17 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 18 | Barry & Campbell | | Oil & Gas Operator | Apr 1981 |
| 19 | Barton Oil & Gas Co., Inc. | | Oil & Gas Operator | Sep 1993 |
| 20 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 21 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 22 | Bass-Franks | | Oil & Gas Operator | Jun 1997 |
| 23 | Bayou Carencro Oil Co. Inc. | | Oil Operator | Apr 2022 |
| 24 | Belco Petroleum Corp | Grand Junction, CO | Oil & Gas Operator | Dec 1983 |
| 25 | Bepco, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2008 |
| 26 | Blackjack Operating L. L. C. | Cibolo, TX 78108 | Oil & Gas Operator | Dec 2025 |
| 27 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 28 | Borden, Inc. | Columbus, OH 43215 | Oil & Gas Operator | May 1990 |
| 29 | Bradco Oil & Gas Company | | Oil & Gas Operator | Dec 1980 |
| 30 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 31 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 32 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 33 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 34 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 35 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 36 | C & D Resources, Inc. | | Oil & Gas Operator | Nov 2001 |
| 37 | C. D. Pierce | | Oil Operator | Mar 1991 |
| 38 | Calyx Exploration & Production | | Oil & Gas Operator | Jul 1991 |
| 39 | Camex Operating Company | | Oil & Gas Operator | Dec 2024 |
| 40 | Camex, Inc. | | Oil & Gas Operator | Jun 1992 |
| 41 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 42 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 43 | Cedyco Corporation | Houston, TX 77227 | Oil & Gas Operator | Nov 2008 |
| 44 | Cel Properties LLC | | Oil & Gas Operator | Jan 2025 |
| 45 | Century Exploration Company | | Oil & Gas Operator | Dec 2003 |
| 46 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 47 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 48 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 49 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 50 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 51 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 52 | Clements Energy, Inc. | | Oil & Gas Operator | Oct 1987 |
| 53 | Condor Petroleum Corporation | | Oil & Gas Operator | Aug 2020 |
| 54 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 55 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 56 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 57 | Cox Oil & Gas Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 58 | Crab Run Gas Company | | Oil & Gas Operator | Feb 1982 |
| 59 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 60 | CSL Exploration, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2018 |
| 61 | Dantex Oil & Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 62 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 63 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 64 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 65 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 66 | Diamond S Operating Co. | | Oil & Gas Operator | Oct 1992 |
| 67 | Dow Chemical Co. | | Oil & Gas Operator | Dec 1997 |
| 68 | Dow Intrastate Gas Company | | Oil Operator | Dec 2023 |
| 69 | Drew Cornell, Inc. | | Oil & Gas Operator | Jun 1992 |
| 70 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 71 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 72 | El-Oil, LTD. | | Oil & Gas Operator | Nov 2024 |
| 73 | Elsbury & Acker | | Oil & Gas Operator | Feb 2003 |
| 74 | Elsbury & McGrew | | Oil & Gas Operator | Nov 1986 |
| 75 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 76 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 77 | Energy Properties Inc. | | Oil & Gas Operator | Dec 2023 |
| 78 | Energy Resource Associates Inc | | Gas Operator | Nov 1988 |
| 79 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Aug 2025 |
| 80 | Enlink Lig, LLC | | Oil Operator | Jan 2025 |
| 81 | Entex, Inc. | | Oil & Gas Operator | Dec 1984 |
| 82 | Equipment, Inc. | | Oil & Gas Operator | Mar 1983 |
| 83 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Dec 2025 |
| 84 | Erskine Operating LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2007 |
| 85 | Etc Oil Corp | | Oil & Gas Operator | Mar 1994 |
| 86 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 87 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 88 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 89 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 90 | Fife Oil Company, Inc. | | Oil & Gas Operator | Feb 2008 |
| 91 | FMP Operating Company, LTD PTN | | Oil & Gas Operator | Mar 1990 |
| 92 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 93 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2025 |
| 94 | Foti Oil & Gas, Inc. | | Oil Operator | Sep 1986 |
| 95 | Franks Petroleum, Inc. Et Al | | Oil & Gas Operator | Oct 1989 |
| 96 | French Production Incorporated | Houston, TX 77086 | Oil & Gas Operator | Dec 1997 |
| 97 | G N K Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 98 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 99 | Geodynamics Oil & Gas, Inc | | Oil & Gas Operator | Feb 1983 |
| 100 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |