| 101 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 102 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Jan 2017 |
| 103 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 104 | King Resources Co. | | Oil & Gas Operator | Dec 1977 |
| 105 | Kykon Oil & Gas, Inc. | Billings, MT 59103 | Oil & Gas Operator | Feb 2009 |
| 106 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 107 | La. Fete Oil & Gas, Inc. | | Oil & Gas Operator | May 1995 |
| 108 | Lahoma Operating, Inc. | | Oil & Gas Operator | Jan 2025 |
| 109 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 110 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 111 | Liberty Oil & Gas Co., Inc. | | Oil Operator | Feb 1991 |
| 112 | Liberty Oil And Gas Corp. | Olney, IL 62450-2489-2489 | Oil & Gas Operator | Dec 2021 |
| 113 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 114 | Louisiana Crude Oil&Gas Co Inc | | Oil & Gas Operator | Mar 1984 |
| 115 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 116 | Loutex Energy, Inc. | Shrevesport, LA 71101 | Oil & Gas Operator | Apr 1992 |
| 117 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | Apr 2025 |
| 118 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 119 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Feb 2025 |
| 120 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 121 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 122 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 123 | Mallard Operating LLC | | Oil & Gas Operator | Nov 2024 |
| 124 | Martin Exploration Co. | | Oil & Gas Operator | Apr 1986 |
| 125 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 126 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 127 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 128 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Apr 2025 |
| 129 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2025 |
| 130 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 131 | Mobil E&P North America Inc. | | Oil & Gas Operator | Jan 1994 |
| 132 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 133 | Murexco Petroleum, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 1996 |
| 134 | Nasser Oil & Gas, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 135 | Natural Resource MGMT. Corp. | | Oil & Gas Operator | Jun 1989 |
| 136 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Apr 2025 |
| 137 | New York Petroleum Corp. | | Oil & Gas Operator | Nov 1982 |
| 138 | Newport Operators, LLC | | Oil & Gas Operator | Jan 2019 |
| 139 | Norbay Oil Corp. | | Oil & Gas Operator | Dec 1999 |
| 140 | North Central Oil Corp. | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 141 | Nugulf Operating, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 142 | Oil And Gas Futures, Inc. | | Oil & Gas Operator | May 1977 |
| 143 | Oilwell Acquisition Co. | | Oil & Gas Operator | Jun 1999 |
| 144 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Apr 2025 |
| 145 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 146 | Osman Global Services LLC | | Oil & Gas Operator | Jan 2025 |
| 147 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 148 | P.M. Petroleum | | Oil Operator | Mar 1998 |
| 149 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2025 |
| 150 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 151 | Paxton Petroleum, LTD. | | Oil & Gas Operator | May 1989 |
| 152 | Pengo Producing Company | | Oil & Gas Operator | Mar 1987 |
| 153 | Pennington Oil & Gas Int, LLC | | Oil & Gas Operator | Dec 2024 |
| 154 | Pennington Operating Company, LLC | | Oil & Gas Operator | Jul 2020 |
| 155 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 156 | Petrominerals Corp. | | Oil & Gas Operator | Dec 2003 |
| 157 | Phoenix Operating Co. Of Texas | | Oil Operator | Jul 1995 |
| 158 | Phoenix Resources Co | | Oil & Gas Operator | Jun 1984 |
| 159 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Dec 2024 |
| 160 | Plymouth Resources Group II Inc | | Oil & Gas Operator | May 2007 |
| 161 | Pointe Coupee Energy, Inc | | Oil Operator | Dec 2013 |
| 162 | Port Hudson Operating Company | | Oil & Gas Operator | Nov 2024 |
| 163 | Power Reserves, Inc. | | Oil Operator | Feb 1999 |
| 164 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 165 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 166 | R & B Oil Company, LLC Of Texas | | Oil & Gas Operator | Jan 2025 |
| 167 | R & M Oil Co. | Fredonia, KS 66736 | Oil & Gas Operator | Aug 2002 |
| 168 | Ranger, Inc. | | Oil & Gas Operator | Dec 1986 |
| 169 | Ray Energy, LLC | | Oil Operator | Jan 2025 |
| 170 | Reliable Prod Service Inc. | | Oil Operator | Mar 2007 |
| 171 | Rock Energy Operating Company | | Oil & Gas Operator | Nov 2008 |
| 172 | Rock Energy, Inc. | | Oil & Gas Operator | Sep 1992 |
| 173 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Apr 2025 |
| 174 | RPS Energy, Inc. | | Oil & Gas Operator | Jul 2020 |
| 175 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 176 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 177 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 178 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 179 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Apr 2025 |
| 180 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 181 | Spartan Royalties, LLC | | Oil Operator | Dec 2024 |
| 182 | Strata Energy, Inc. | | Oil & Gas Operator | Sep 1983 |
| 183 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Apr 2025 |
| 184 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 185 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 186 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 187 | Taurus Petroleum | | Oil & Gas Operator | Jul 1987 |
| 188 | Tellus Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 189 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jan 2025 |
| 190 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Apr 2025 |
| 191 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 192 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2024 |
| 193 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Apr 2025 |
| 194 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 195 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 196 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 197 | The Dow Chemical Company | | Oil & Gas Operator | Dec 1997 |
| 198 | The Maurice L. Brown Company | | Oil & Gas Operator | Aug 1987 |
| 199 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Apr 2025 |
| 200 | Toce Energy, L.L.C. | | Oil & Gas Operator | Dec 2017 |