| 101 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 102 | Griffin Resources, Inc. | | Oil & Gas Operator | Mar 2025 |
| 103 | Gulf Coast Mineral, LLC | Foley, AL 36535 | Oil & Gas Operator | Jul 2021 |
| 104 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 105 | Gulf Pine Energy, LP | | Oil & Gas Operator | Mar 2025 |
| 106 | Gulf Refining Co. | | Oil Operator | Dec 2006 |
| 107 | Gurnee Gas Co., L.L.C. | | Gas Operator | Jul 2001 |
| 108 | H & S Operating Co., Inc. | Winesburg, OH 44690 | Oil & Gas Operator | Dec 2024 |
| 109 | Hadson Petroleum (USA), Inc. | | Oil & Gas Operator | Dec 1992 |
| 110 | Harkins & Co. | | Oil & Gas Operator | Oct 1986 |
| 111 | Hawkeye Oil & Gas, Inc. | | Gas Operator | Jun 1995 |
| 112 | Herlihy, John D. | | Oil & Gas Operator | May 1997 |
| 113 | Hickox, I. N. | | Oil Operator | Nov 1967 |
| 114 | Highland Oil Co. | | Oil Operator | Mar 1953 |
| 115 | Highmount Black Warrior Basin, LLC | | Gas Operator | Jul 2010 |
| 116 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 117 | Hodge, T.F. & Morrow Oil & Gas Co. | | Oil & Gas Operator | Sep 1993 |
| 118 | Houser, R. G. | | Oil Operator | Mar 1953 |
| 119 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 120 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 121 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 122 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Mar 2025 |
| 123 | Hughes Eastern Petroleum, LTD. | | Oil & Gas Operator | Jun 1986 |
| 124 | Hughes Petroleum Corp. | | Oil Operator | Dec 1972 |
| 125 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |
| 126 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 127 | Huseman Oil International, Inc. | | Oil & Gas Operator | Feb 1992 |
| 128 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 129 | J. R. Pounds, Inc. | Laurel, MS 39441 | Oil & Gas Operator | May 2025 |
| 130 | Jabsco Oil Operating, LLC | Tuscaloosa, AL 35401 | Oil & Gas Operator | Mar 2025 |
| 131 | JL Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 132 | JN Expl & Prod LTD Partnership | Billings, MT 59103-0159 | Oil & Gas Operator | Feb 2001 |
| 133 | John E. McCool, Dba Edward Oil Company | Youngsville, PA 16371-0202 | Oil & Gas Operator | Mar 2025 |
| 134 | Johnson, L.W. & Assoc., Inc. | | Gas Operator | Jun 1989 |
| 135 | Johnson, Larry L. & Williams, Earl | | Oil Operator | Dec 1967 |
| 136 | Justiss Oil Co., Inc.-Munoco Co. | | Oil & Gas Operator | Dec 2008 |
| 137 | Justiss Oil Co., Inc.-Munoco Co., L.C. | | Gas Operator | Mar 2001 |
| 138 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Mar 2025 |
| 139 | Kavanaugh Energy Services, Inc. | | Gas Operator | Mar 2025 |
| 140 | Kelley Industries, Inc. | Waynesboro, MS 39367 | Oil & Gas Operator | Jul 2005 |
| 141 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 142 | Kelton Co. | | Oil Operator | Dec 1964 |
| 143 | Kelton Operating Co., Inc. | | Oil Operator | Jul 1991 |
| 144 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 145 | Kukui Operating Company | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 146 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 147 | Land And Natural Resource Development, Inc. | Northport, AL 35473 | Oil & Gas Operator | Mar 2025 |
| 148 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 149 | Lee, R.A., Inc. | | Oil Operator | Nov 1972 |
| 150 | Legacy Resources Co., L.P. | | Oil & Gas Operator | Apr 2019 |
| 151 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Jul 2025 |
| 152 | Local, Inc. | Orange Park, FL 32073 | Oil & Gas Operator | Feb 2025 |
| 153 | Longleaf Energy Group, Inc. | Brewton, AL 36426 | Oil & Gas Operator | Feb 2004 |
| 154 | Lower 15 Oil Corporation | Gilbertown, AL 36908 | Oil & Gas Operator | Mar 2025 |
| 155 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 156 | Mallard Exploration, Inc. | | Oil & Gas Operator | Sep 1975 |
| 157 | Marco Land & Petroleum, Inc. | | Oil & Gas Operator | Jun 2000 |
| 158 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 159 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 160 | McPhearson, Richard E. | | Oil Operator | Mar 1956 |
| 161 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 162 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 163 | Merit Energy Co. Dba Alabama Merit Energy Co., Inc. | | Oil & Gas Operator | Aug 2005 |
| 164 | Michigan Oil Co. | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 165 | Midco Energy, Inc. | | Oil & Gas Operator | Dec 1992 |
| 166 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. | | Oil & Gas Operator | Feb 2010 |
| 167 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. & Placid Oil Co. | | Oil & Gas Operator | May 1991 |
| 168 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 169 | Miller, W.C. | | Oil & Gas Operator | Jan 1992 |
| 170 | Mississippi Resources, LLC Dba MSR Operating, LLC | | Oil & Gas Operator | May 2021 |
| 171 | Mobay Storage Hub LLC | | Gas Operator | Oct 2008 |
| 172 | Mobil Oil Exploration & Producing Southeast, Inc. | | Oil & Gas Operator | Mar 2025 |
| 173 | Mobile Gulf, Inc. | | Oil & Gas Operator | Aug 1985 |
| 174 | Moon-Hines-Tigrett Operating Co., Inc. | | Oil & Gas Operator | Mar 2025 |
| 175 | Morrow Oil & Gas Co. | Terry, MS 39170 | Oil & Gas Operator | Mar 2025 |
| 176 | Morrow Operating Co., Inc. | | Oil Operator | Mar 2003 |
| 177 | Mosbacher Production Co. | Houston, TX 77001 | Oil & Gas Operator | Aug 1984 |
| 178 | Mosbacher, Robert-Pruet, Chesley | | Oil & Gas Operator | Dec 1983 |
| 179 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 180 | Munoco Co. L.C. | | Oil & Gas Operator | Jun 2003 |
| 181 | Murphy Production Co. (Inc.) | | Oil & Gas Operator | Apr 1991 |
| 182 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 183 | Natural Gas & Oil, Inc. | Fayette, AL 35555 | Oil & Gas Operator | Mar 2025 |
| 184 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Jul 2025 |
| 185 | Oak Grove Resources, LLC | | Gas Operator | Mar 2025 |
| 186 | Odom, Ralph R. | | Oil & Gas Operator | Aug 1993 |
| 187 | Offshore Group, Inc. The | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 188 | Oglesby, Marshall | | Oil Operator | May 1990 |
| 189 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 190 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 191 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jul 2025 |
| 192 | Patrick Petroleum Corp. | | Oil & Gas Operator | Oct 1984 |
| 193 | Peco Foods, Inc. | | Oil & Gas Operator | Mar 2025 |
| 194 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 195 | Pete'S Pumping & Well Services, LLC | Butler, AL 36904 | Oil & Gas Operator | Mar 2025 |
| 196 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 197 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 198 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 199 | Petronova, LLC | | Gas Operator | Jul 2014 |
| 200 | Petrus Oil Company., L.P. | | Oil & Gas Operator | Dec 1989 |