| 101 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 102 | Greystone Petroleum, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 103 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 104 | Gulf States Pipeline Corp. | | Oil & Gas Operator | May 2003 |
| 105 | H M Jarred & Walsh-Watts | | Oil & Gas Operator | Sep 1992 |
| 106 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 107 | Harvey Broyles | | Oil & Gas Operator | May 2012 |
| 108 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 109 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 110 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 111 | Hunt Brothers Producing Co Inc | Redding, CA 96049-2516 | Oil & Gas Operator | Sep 2012 |
| 112 | Hunt Oil Co., Et Al | | Oil & Gas Operator | Nov 1992 |
| 113 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 114 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |
| 115 | Imc Exploration Co. | | Oil & Gas Operator | Oct 1986 |
| 116 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 117 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 118 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Feb 2026 |
| 119 | Jack W. Grigsby | | Oil & Gas Operator | Sep 2001 |
| 120 | Jae Exploration & Development | | Oil & Gas Operator | Sep 1993 |
| 121 | Jan-Mar Oil Company Inc. | | Oil & Gas Operator | Jan 2025 |
| 122 | John J. Welsh | | Oil & Gas Operator | Dec 2024 |
| 123 | Jones-O'Brien, Inc. | | Oil & Gas Operator | Feb 1982 |
| 124 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 125 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 126 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 127 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 128 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 129 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2025 |
| 130 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Nov 2025 |
| 131 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 132 | L P C Energy, Inc. | | Oil & Gas Operator | Mar 1985 |
| 133 | L'Oil Operating And MGMT. Co. | | Oil & Gas Operator | Dec 2008 |
| 134 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Nov 2025 |
| 135 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 136 | Lear Gas Transmission | | Oil Operator | Aug 1989 |
| 137 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 138 | Lindenmuth & Associates | | Oil & Gas Operator | Aug 2001 |
| 139 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 140 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 141 | Long Oil & Natural Gas Corp. | | Oil & Gas Operator | Feb 1996 |
| 142 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 143 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 144 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 145 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 146 | McConathy & Associates | | Oil & Gas Operator | Dec 1983 |
| 147 | McConathy Production Co.,Inc. | | Oil & Gas Operator | Jun 1990 |
| 148 | McCord Exploration Co. | | Oil & Gas Operator | Dec 1990 |
| 149 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 150 | McRae Exploration, Inc. | | Oil & Gas Operator | Mar 1984 |
| 151 | McRae Oil Corporation | | Oil & Gas Operator | Mar 1984 |
| 152 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 153 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 154 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 155 | Minatome Corpora | | Oil & Gas Operator | Sep 1987 |
| 156 | Mineral Ventures, Inc. | | Oil & Gas Operator | Dec 2024 |
| 157 | Mississippi River Transm. Corp | | Oil & Gas Operator | Sep 2002 |
| 158 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 159 | Mobley Oil Company, Inc. | | Oil & Gas Operator | Feb 1990 |
| 160 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 161 | Moran Oil Co., Inc. | | Oil & Gas Operator | Aug 2009 |
| 162 | Morgan Enterprises | | Oil & Gas Operator | Aug 1997 |
| 163 | MRD Operating LLC | | Oil & Gas Operator | Dec 2016 |
| 164 | MRT Exploration Co | | Oil & Gas Operator | Feb 1983 |
| 165 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 166 | Murphy Oil USA, Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 167 | Nadel & Gussman | Tulsa, OK 74103 | Oil & Gas Operator | May 2007 |
| 168 | Nadel & Gussman-Jetta Oper. Co. | | Oil & Gas Operator | Mar 2012 |
| 169 | Nadel And Gussman LLC | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2026 |
| 170 | Nadel And Gussman Ruston, LLC | | Oil & Gas Operator | Dec 2024 |
| 171 | Nelson Energy, Inc. | | Oil & Gas Operator | Nov 2024 |
| 172 | Nelson Oil & Gas, Inc. | | Oil & Gas Operator | Aug 1995 |
| 173 | Nomeco Oil & Gas Co. | Jackson, MI 49204 | Oil & Gas Operator | Dec 1994 |
| 174 | Northern Michigan Expl Co | | Oil & Gas Operator | Jul 1990 |
| 175 | O'Brien Operating Company | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2004 |
| 176 | O. B. Mobley | | Oil & Gas Operator | Jul 1989 |
| 177 | Oakfield Energy LLC | | Oil Operator | Jun 2019 |
| 178 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 179 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 180 | Onshore Pipeline Const Co Inc | | Oil & Gas Operator | Aug 1998 |
| 181 | Osr Oil & Gas Corp | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 182 | Ouida Oil Co. | | Oil & Gas Operator | Apr 1999 |
| 183 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 184 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 185 | Ozark Production Company, Inc. | | Oil & Gas Operator | Jan 2025 |
| 186 | Palmer Petroleum, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 187 | Pan-Ok Production Company | | Oil & Gas Operator | Nov 2024 |
| 188 | Panenergy La Intrastate Co | | Oil Operator | Mar 2000 |
| 189 | Pelico Pipeline, LLC | | Oil Operator | Dec 2024 |
| 190 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 191 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 192 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 193 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 194 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 195 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 196 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 197 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Feb 2026 |
| 198 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Dec 2025 |
| 199 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 200 | Pitts Oil Co-Dallas Prod Inc | | Oil & Gas Operator | Jun 1991 |