| 101 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 102 | Las Services, Inc. | | Oil & Gas Operator | Oct 1997 |
| 103 | Leeward Operators LLC | | Oil & Gas Operator | Jul 2011 |
| 104 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | May 2025 |
| 105 | LGS Exploration, Inc. | | Oil & Gas Operator | Jan 1991 |
| 106 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 107 | Linder Oil Company | | Oil & Gas Operator | Apr 1985 |
| 108 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | May 2025 |
| 109 | Louisiana Offshore Exploration, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 110 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | May 2025 |
| 111 | Lymac Exploration And Production, LLC | | Oil & Gas Operator | Jul 2016 |
| 112 | Lyons Pet., McCain & Jackson | | Oil & Gas Operator | Dec 1981 |
| 113 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 114 | M.J. Bernos, Jr./PKR Oil, Inc. | | Gas Operator | Aug 1990 |
| 115 | Magnolia Production Company LLC | | Oil & Gas Operator | Nov 2024 |
| 116 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | May 2025 |
| 117 | Manursing Island Prod. Corp. | | Oil & Gas Operator | Sep 2002 |
| 118 | Marine Properties, Inc. | | Oil & Gas Operator | Feb 1995 |
| 119 | Matzinger Petroleum Co. | | Oil & Gas Operator | Jan 1991 |
| 120 | McAlester Fuel Co | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |
| 121 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 122 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 123 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | May 2025 |
| 124 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2025 |
| 125 | Midnight Drilling LLC | | Oil & Gas Operator | Jan 2016 |
| 126 | Midstates Petroleum Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 127 | Miss-Lou Operating LLC | | Oil & Gas Operator | Feb 2025 |
| 128 | Miss-Lou Petroleum LLC | | Oil & Gas Operator | Jun 2011 |
| 129 | Mole Operating Co., Inc. | | Oil & Gas Operator | Oct 1983 |
| 130 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 131 | Moore McCormack Energy, Inc. | | Oil & Gas Operator | Jul 1988 |
| 132 | Navitas Resources, LLC | | Oil & Gas Operator | May 2016 |
| 133 | Nerco Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1996 |
| 134 | Nicklos Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Nov 1986 |
| 135 | Nicor Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 136 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 137 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 138 | Oil & Gas Development Company | | Oil & Gas Operator | May 1991 |
| 139 | Oldfield Operating Corporation | | Oil Operator | Dec 2013 |
| 140 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 141 | Osr Oil & Gas Corp | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 142 | P D Parker | | Oil & Gas Operator | Aug 1985 |
| 143 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 144 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 145 | Parker & Parsley Petroleum Co. | | Oil & Gas Operator | Dec 1990 |
| 146 | Pelican Dome Exploration Inc. | Harahan, LA 70123 | Oil & Gas Operator | Aug 2000 |
| 147 | Pennington Oil & Gas Int, LLC | | Oil & Gas Operator | Dec 2024 |
| 148 | Pennington Operating Company, LLC | | Oil & Gas Operator | Jul 2020 |
| 149 | Pine Island Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 150 | Premier Natural Resources II,LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2015 |
| 151 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 152 | Quest Exploration L.L.C. | | Oil & Gas Operator | Jul 2014 |
| 153 | R L Operating Co LLC | | Oil Operator | Aug 2024 |
| 154 | Reserve Partners L.L.C. | | Oil & Gas Operator | Feb 2001 |
| 155 | Rig Iron Petroleum Inc | | Oil & Gas Operator | Aug 1988 |
| 156 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 157 | Risher Company, Inc. | | Oil & Gas Operator | Jul 2001 |
| 158 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 159 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 160 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 161 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 162 | Santana Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 163 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 164 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 165 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 166 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | May 2025 |
| 167 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 168 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 169 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 170 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 171 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 172 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 173 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 174 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 175 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | May 2025 |
| 176 | South La. Production Co., Inc. | | Oil & Gas Operator | Jun 1982 |
| 177 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 178 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 179 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 180 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 181 | Striper Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Apr 2002 |
| 182 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 183 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 184 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 185 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 186 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 187 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 188 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 189 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 190 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 191 | Thrall Texas Oil, LLC | | Oil & Gas Operator | Jan 2025 |
| 192 | Toce Oil Company | | Oil & Gas Operator | Dec 2014 |
| 193 | Tom Littlepage Oil Properties | | Oil & Gas Operator | Dec 1984 |
| 194 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 195 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 196 | Tricentrol Resources Inc | Englewood, CO 80111 | Oil & Gas Operator | Jun 1984 |
| 197 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 198 | Tryvest, Inc. | | Oil & Gas Operator | Sep 1991 |
| 199 | Turnkey E&P Corporation | | Oil & Gas Operator | Dec 2010 |
| 200 | Union Gas Operating Company | Houston, TX 77014 | Oil & Gas Operator | May 2025 |