| 101 | Indian Territory Operating LLC | Salado, TX 76571 | Oil & Gas Operator | Jan 2024 |
| 102 | Indian Wells Oil | | Oil & Gas Operator | Jul 1995 |
| 103 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 104 | Indiana Petroleum Cont | | Oil Operator | Dec 2023 |
| 105 | Indianola Oil Inc | Bartlesville, OK 74005 | Oil & Gas Operator | Aug 2000 |
| 106 | Indiek, John | Offerle, KS 67563 | Oil Operator | Nov 2005 |
| 107 | Indigo Haynesville LLC | | Gas Operator | Feb 2018 |
| 108 | Indigo II Louisiana Operating LLC | | Oil & Gas Operator | Feb 2015 |
| 109 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 110 | Indigo Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2019 |
| 111 | Indrex Inc | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2000 |
| 112 | Industrial Gas Services Inc | Wheat Ridge, CO 80033 | Oil & Gas Operator | Feb 2023 |
| 113 | Industrial Pollution Control | | Oil & Gas Operator | Mar 1985 |
| 114 | Industry Standard Supplies Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2024 |
| 115 | Indy Oil, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2004 |
| 116 | Ineos USA Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 117 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 118 | Inferno Energy | Yates Center, KS 66783 | Oil Operator | Jan 2025 |
| 119 | Infield Discovery LLC | Madison, MS 39110 | Oil & Gas Operator | Dec 2024 |
| 120 | Infinity Oil & Gas Inc | Nowata, OK 74048 | Oil Operator | Jun 1993 |
| 121 | Infinity Oil & Gas Of TX, Inc. | Overland Park, KS 66210 | Oil & Gas Operator | Jun 2025 |
| 122 | Infinity Oil & Gas Of Wyoming | Rock Springs, WY 82902 | Oil & Gas Operator | Feb 2009 |
| 123 | Infinity Oil & Gas Of Wyoming Inc | | Oil Operator | Dec 2007 |
| 124 | Infinity Oil And Gas, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 125 | Infinity Oil, Inc. | Hays, KS 67601 | Oil Operator | Feb 2025 |
| 126 | Inflection Energy (Pa) LLC | Montoursville, PA 17754-9702 | Gas Operator | Mar 2025 |
| 127 | Inflow Petroleum Resources LP | Dallas, TX 75240 | Oil & Gas Operator | Sep 2008 |
| 128 | Ingersoll Oil Inc | Hominy, OK 74035 | Oil & Gas Operator | Jun 2000 |
| 129 | Ingersoll Rosinbaum Oil Inc | | Oil & Gas Operator | Feb 2025 |
| 130 | Ingo Energy, LLC | | Oil & Gas Operator | Dec 2016 |
| 131 | Ingram Exploration Inc | Seminole, OK 74868 | Oil & Gas Operator | Mar 2025 |
| 132 | Ingram, J. Oil & Gas, Inc. | Plano, TX 75074 | Oil & Gas Operator | Jun 2025 |
| 133 | Initial Energy Services, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2025 |
| 134 | Inject Technologies Inc. | Andrews, TX 79714 | Oil Operator | Jun 2025 |
| 135 | Injection Well Service | Lone Grove, OK 73443-0156 | Oil Operator | Apr 2005 |
| 136 | Inlan Oceans, LLC | Coffeyville, KS 67337 | Oil Operator | Oct 2024 |
| 137 | Inland Drilling Co Inc | Garretsville, OH 44231 | Oil & Gas Operator | Dec 1992 |
| 138 | Inland Gas Corp. | Houston, TX 77036 | Oil Operator | Dec 2011 |
| 139 | Inland Minerals Management, Inc. | Austin, TX 78701 | Oil & Gas Operator | Jun 2025 |
| 140 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2025 |
| 141 | Inland Oil And Gas | Nacogdoches, TX 75961 | Oil & Gas Operator | Dec 1997 |
| 142 | Inland Oil And Gas Corp. | | Gas Operator | Jun 2014 |
| 143 | Inland Oil Corporation | Sapulpa, OK 74066 | Oil & Gas Operator | Jan 2025 |
| 144 | Inland Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 145 | Inland Petroleum | Newark, OH 43055 | Oil Operator | Dec 2009 |
| 146 | Inland Petroleum Company | | Oil & Gas Operator | Dec 1997 |
| 147 | Inland Production Company | Vernal, UT 84079 | Oil & Gas Operator | Dec 2004 |
| 148 | Inman Oil LLC | Ruidoso, NM 88355 | Oil Operator | Mar 2025 |
| 149 | Innes Petroleum | | Oil Operator | Nov 1994 |
| 150 | Innex California Inc. | | Oil & Gas Operator | Mar 2025 |
| 151 | Innovative Exploration, LLC | Cincinnati, OH 45219 | Oil Operator | Dec 2023 |
| 152 | Innovative Resources, Inc. | | Oil Operator | Feb 2022 |
| 153 | Innoverse Production, LLC | Gainesville, TX 76240 | Oil & Gas Operator | Jun 2025 |
| 154 | Inpetco, Inc. | | Oil & Gas Operator | Aug 1991 |
| 155 | Inpex Eagle Ford, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2022 |
| 156 | Inr Ohio LLC | Morgantown, WV 26508-9209 | Oil & Gas Operator | Mar 2025 |
| 157 | Inr Opr LLC | Morgantown, WV 26508-9201 | Gas Operator | Mar 2025 |
| 158 | Inspire Oil And Gas Inc. | Katy, TX 77449 | Oil & Gas Operator | Jun 2025 |
| 159 | Instrat Inc. | | Oil & Gas Operator | Dec 1992 |
| 160 | Int'L Petr & Expl Opr Corp | | Oil & Gas Operator | Jan 2012 |
| 161 | Integras Operating, LLC | Irving, TX 75062 | Oil & Gas Operator | Jun 2025 |
| 162 | Integrated Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 163 | Integrated Energy Service Corp | Cleveland, OK 74020 | Oil & Gas Operator | Nov 1998 |
| 164 | Integrated Exploration & Production LLC | | Oil & Gas Operator | Aug 2024 |
| 165 | Integrated Operating Corporation | Dallas, TX 75243 | Oil & Gas Operator | Jun 2025 |
| 166 | Integrated Petroleum Corporation | Denver, CO 80202 | Oil Operator | Jan 2010 |
| 167 | Integrity Funding Sys Inc | Lancaster, PA 17602-1933 | Gas Operator | Dec 2007 |
| 168 | Integrity Oil & Gas | Golden, CO 80401 | Oil & Gas Operator | May 2011 |
| 169 | Inter-American Energy Corp. | Toronto, On Canada M5a1n1, 33139 | Gas Operator | Dec 2019 |
| 170 | Inter-American Petroleum | | Oil & Gas Operator | Dec 2006 |
| 171 | Inter-State Ener | | Oil Operator | Oct 1987 |
| 172 | Inter-States Oil & Gas Inc | Edmond, OK 73003-0023 | Oil & Gas Operator | Apr 2020 |
| 173 | Intercity Management Corp. | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Jun 2025 |
| 174 | Intercoast Oil And Gas | Tulsa, OK 74136 | Oil & Gas Operator | Mar 1997 |
| 175 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 176 | Intercoastal Energy, Inc. | Houston, TX 77055 | Oil & Gas Operator | Aug 2003 |
| 177 | Intercoastal Operating Co. | | Oil Operator | Dec 1980 |
| 178 | Intercontinental Petroleum | | Oil Operator | Oct 2012 |
| 179 | Intercontinental Tech Group Inc. | | Oil & Gas Operator | Dec 2004 |
| 180 | Intergrated Drill & Expl Inc | Tulsa, OK 74136-1071 | Oil & Gas Operator | Sep 1994 |
| 181 | Intergrated Petroleum Corp. | Abilene, TX 79602 | Oil & Gas Operator | Jun 2025 |
| 182 | Intergy Production LLC | Edmond, OK 73083 | Oil & Gas Operator | Mar 2025 |
| 183 | Intergy, Inc. | Lomita, CA 90717 | Oil Operator | Jun 1997 |
| 184 | Interior Oil Cor | | Gas Operator | Jun 1990 |
| 185 | Interior Oil Corporation | Derby, KS 67037 | Oil & Gas Operator | Jan 2023 |
| 186 | Interline Resources Corp | Casper, WY 82601 | Oil & Gas Operator | Oct 2009 |
| 187 | Intermountain Leasing, Inc. | Billings, MT 59103 | Gas Operator | Mar 2020 |
| 188 | Intermountain Oil Co | | Oil & Gas Operator | Nov 2003 |
| 189 | Intermountain Operating, Inc. | Billings, MT 59103 | Oil & Gas Operator | Jul 2001 |
| 190 | Intermountain Petroleum Co | | Oil Operator | Dec 2011 |
| 191 | Intermountain Refining Co, Inc | Farmington, NM 87499 | Gas Operator | Aug 2006 |
| 192 | International Basic Res., Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 1996 |
| 193 | International Energy Company LLC | Tulsa, OK 74136-3922 | Oil & Gas Operator | Jan 2025 |
| 194 | International Energy Corporation | Tulsa, OK 74136-3922 | Oil & Gas Operator | Dec 2018 |
| 195 | International Oil & Gas Corp. | | Oil & Gas Operator | Dec 1986 |
| 196 | International Oil&Gas Consultant | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 197 | International Petroleum Service, LLC | | Oil Operator | Dec 2017 |
| 198 | International Ventures, Inc. | Pogasa Springs, CO 81147 | Oil Operator | Jul 1996 |
| 199 | International Western Oil Corp | Weatherford, TX 76086 | Oil & Gas Operator | Jun 2025 |
| 200 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |