| 101 | Entex Petroleum, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 102 | Entex, Inc. | | Oil & Gas Operator | Dec 1984 |
| 103 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 104 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 105 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 106 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 107 | Excalibur Operating, LLC | | Oil & Gas Operator | Nov 2024 |
| 108 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 109 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 110 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 111 | F.A.S. Environmental Services, L.L.C. | | Oil Operator | Jan 2025 |
| 112 | Fas Services, Inc. | | Oil Operator | Apr 2005 |
| 113 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 114 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 115 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 116 | Forman Exploration Company | | Oil & Gas Operator | Oct 1988 |
| 117 | Freeport Oil Company | New Orleans, LA 70112 | Oil & Gas Operator | Oct 1979 |
| 118 | Future Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2010 |
| 119 | G. B. & F. Exploration, Inc. | | Oil & Gas Operator | Feb 1991 |
| 120 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Oct 2025 |
| 121 | Gas Gathering Corp. | | Oil Operator | Oct 1997 |
| 122 | Gas Marketing, Inc. | Stafford, KS 67578 | Oil Operator | Mar 2007 |
| 123 | General Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 124 | George D. Hartfield Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2024 |
| 125 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 126 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 127 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 128 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 129 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 130 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 131 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 132 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 133 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 134 | Gulf Production Company, Inc. | | Oil & Gas Operator | Dec 2024 |
| 135 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 136 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 137 | Gyb-Britlind Oil, LLC | | Oil & Gas Operator | Jun 2016 |
| 138 | H.L.Hawkins &H.L.Hawkins, Jr. | | Oil & Gas Operator | Feb 1989 |
| 139 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 140 | Hadson Petroleum (USA), Inc. | | Oil & Gas Operator | Dec 1992 |
| 141 | Hamon Oil Company | | Oil & Gas Operator | Aug 1985 |
| 142 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 143 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Oct 2025 |
| 144 | Hawthorne Oil And Gas Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1993 |
| 145 | Hawthorne-Tipco | | Oil & Gas Operator | Oct 1978 |
| 146 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 147 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 148 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 149 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 150 | Highlander Oil & Gas Assets LLC | | Gas Operator | Jan 2025 |
| 151 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 152 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 153 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 154 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 155 | Hughes Denny Offshore Expl Inc | | Oil & Gas Operator | Nov 1988 |
| 156 | Hughes Eastern Petroleum, Inc. | | Oil & Gas Operator | Apr 1993 |
| 157 | Hughes-Denny Petroleum Co.,Inc | | Oil & Gas Operator | Dec 1987 |
| 158 | Hughes-Nicklaus Oil Co., LTD. | | Oil & Gas Operator | Feb 1986 |
| 159 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 160 | Hydrocarbon MGMT., Inc. | | Oil & Gas Operator | Mar 1997 |
| 161 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 162 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Oct 2025 |
| 163 | J. P. M. Investments, LTD. | | Oil & Gas Operator | Sep 1988 |
| 164 | J. P. Van Way | | Oil & Gas Operator | Dec 2024 |
| 165 | Jake L. Hamon | | Oil & Gas Operator | Dec 1983 |
| 166 | James M. Forgotson | | Oil & Gas Operator | Jan 1984 |
| 167 | Janex Oil Co., Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jun 2005 |
| 168 | K-B Exploration Co. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 169 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 170 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Oct 2025 |
| 171 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 172 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 173 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 174 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 175 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 176 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 177 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 178 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 179 | Lamson Petroleum Corporation | | Oil & Gas Operator | Mar 1993 |
| 180 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 181 | Leeward Operators LLC | | Oil & Gas Operator | Jul 2011 |
| 182 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 183 | LGS Exploration, Inc. | | Oil & Gas Operator | Jan 1991 |
| 184 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 185 | Linder Oil Company | | Oil & Gas Operator | Apr 1985 |
| 186 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Oct 2025 |
| 187 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 188 | Llog Exploration Company, L.L.C. | | Oil & Gas Operator | Jun 2025 |
| 189 | Louisiana Gas Development Corp | | Oil & Gas Operator | Jan 2025 |
| 190 | Louisiana Gas System, Inc. | | Oil Operator | Apr 2004 |
| 191 | Lynal, Inc. | | Oil & Gas Operator | Oct 1988 |
| 192 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 193 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2025 |
| 194 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 195 | Mallard Petroleum, Inc. | | Oil & Gas Operator | Apr 1986 |
| 196 | Manursing Island Prod. Corp. | | Oil & Gas Operator | Sep 2002 |
| 197 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 198 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 199 | Marshall Prod. & Energy Inc. | | Oil & Gas Operator | Jan 1992 |
| 200 | May Petroleum, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |