| 14001 | Inland Petroleum Company | | Oil & Gas Operator | Dec 1997 |
| 14002 | Inland Production Company | Vernal, UT 84079 | Oil & Gas Operator | Dec 2004 |
| 14003 | Inman Oil LLC | Ruidoso, NM 88355 | Oil Operator | Jun 2025 |
| 14004 | Innes Petroleum | | Oil Operator | Nov 1994 |
| 14005 | Innex California Inc. | | Oil & Gas Operator | Jul 2025 |
| 14006 | Innovative Exploration, LLC | Cincinnati, OH 45219 | Oil Operator | Dec 2023 |
| 14007 | Innovative Resources, Inc. | | Oil Operator | Feb 2022 |
| 14008 | Innoverse Production, LLC | Gainesville, TX 76240 | Oil & Gas Operator | Sep 2025 |
| 14009 | Inpetco, Inc. | | Oil & Gas Operator | Aug 1991 |
| 14010 | Inpex Eagle Ford, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2022 |
| 14011 | Inr Ohio LLC | Morgantown, WV 26508-9209 | Oil & Gas Operator | Jun 2025 |
| 14012 | Inr Opr LLC | Morgantown, WV 26508-9201 | Gas Operator | Jun 2025 |
| 14013 | Inspire Oil And Gas Inc. | Katy, TX 77449 | Oil & Gas Operator | Sep 2025 |
| 14014 | Instrat Inc. | | Oil & Gas Operator | Dec 1992 |
| 14015 | Int'L Petr & Expl Opr Corp | | Oil & Gas Operator | Jan 2012 |
| 14016 | Integras Operating, LLC | Irving, TX 75062 | Oil & Gas Operator | Sep 2025 |
| 14017 | Integrated Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 14018 | Integrated Energy Service Corp | Cleveland, OK 74020 | Oil & Gas Operator | Nov 1998 |
| 14019 | Integrated Exploration & Production LLC | | Oil & Gas Operator | Aug 2024 |
| 14020 | Integrated Operating Corporation | Dallas, TX 75243 | Oil & Gas Operator | Sep 2025 |
| 14021 | Integrated Petroleum Corporation | Denver, CO 80202 | Oil Operator | Jan 2010 |
| 14022 | Integrity Funding Sys Inc | Lancaster, PA 17602-1933 | Gas Operator | Dec 2007 |
| 14023 | Integrity Oil & Gas | Golden, CO 80401 | Oil & Gas Operator | May 2011 |
| 14024 | Inter-American Energy Corp. | Toronto, On Canada M5a1n1, 33139 | Gas Operator | Dec 2019 |
| 14025 | Inter-American Petroleum | | Oil & Gas Operator | Dec 2006 |
| 14026 | Inter-State Ener | | Oil Operator | Oct 1987 |
| 14027 | Inter-States Oil & Gas Inc | Edmond, OK 73003-0023 | Oil & Gas Operator | Apr 2020 |
| 14028 | Intercity Management Corp. | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Sep 2025 |
| 14029 | Intercoast Oil And Gas | Tulsa, OK 74136 | Oil & Gas Operator | Mar 1997 |
| 14030 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 14031 | Intercoastal Energy, Inc. | Houston, TX 77055 | Oil & Gas Operator | Aug 2003 |
| 14032 | Intercoastal Operating Co. | | Oil Operator | Dec 1980 |
| 14033 | Intercontinental Petroleum | | Oil Operator | Oct 2012 |
| 14034 | Intercontinental Tech Group Inc. | | Oil & Gas Operator | Dec 2004 |
| 14035 | Intergrated Drill & Expl Inc | Tulsa, OK 74136-1071 | Oil & Gas Operator | Sep 1994 |
| 14036 | Intergrated Petroleum Corp. | Abilene, TX 79602 | Oil & Gas Operator | Sep 2025 |
| 14037 | Intergy Production LLC | Edmond, OK 73083 | Oil & Gas Operator | Jun 2025 |
| 14038 | Intergy, Inc. | Lomita, CA 90717 | Oil Operator | Jun 1997 |
| 14039 | Interior Oil Cor | | Gas Operator | Jun 1990 |
| 14040 | Interior Oil Corporation | Derby, KS 67037 | Oil & Gas Operator | Jan 2023 |
| 14041 | Interline Resources Corp | Casper, WY 82601 | Oil & Gas Operator | Oct 2009 |
| 14042 | Intermountain Leasing, Inc. | Billings, MT 59103 | Gas Operator | Mar 2020 |
| 14043 | Intermountain Oil Co | | Oil & Gas Operator | Nov 2003 |
| 14044 | Intermountain Operating, Inc. | Billings, MT 59103 | Oil & Gas Operator | Jul 2001 |
| 14045 | Intermountain Petroleum Co | | Oil Operator | Dec 2011 |
| 14046 | Intermountain Refining Co, Inc | Farmington, NM 87499 | Gas Operator | Aug 2006 |
| 14047 | International Basic Res., Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 1996 |
| 14048 | International Energy Company LLC | Tulsa, OK 74136-3922 | Oil & Gas Operator | Jul 2025 |
| 14049 | International Energy Corporation | Tulsa, OK 74136-3922 | Oil & Gas Operator | Dec 2018 |
| 14050 | International Oil & Gas Corp. | | Oil & Gas Operator | Dec 1986 |
| 14051 | International Oil&Gas Consultant | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 14052 | International Petroleum Service, LLC | | Oil Operator | Dec 2017 |
| 14053 | International Ventures, Inc. | Pogasa Springs, CO 81147 | Oil Operator | Jul 1996 |
| 14054 | International Western Oil Corp | Weatherford, TX 76086 | Oil & Gas Operator | Sep 2025 |
| 14055 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 14056 | Interstate Energy Inc | | Oil & Gas Operator | Dec 2002 |
| 14057 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Sep 2025 |
| 14058 | Interstate Gas Co. | | Gas Operator | Dec 1941 |
| 14059 | Interstate Gas MKT Inc | Indiana, PA 15701 | Oil & Gas Operator | Dec 2018 |
| 14060 | Interstate Natural Gas Company, LLC | Pikeville, KY 41502 | Oil & Gas Operator | Dec 2023 |
| 14061 | Interstate Operating LLC | Tulsa, OK 74101-0535 | Oil & Gas Operator | Aug 2013 |
| 14062 | Interstate Producing Ser Inc | | Oil & Gas Operator | May 1986 |
| 14063 | Interstate Producing Servs,Inc | | Oil & Gas Operator | May 1987 |
| 14064 | Interstate Production Company, Inc. | Buckhannon, WV 26201-0000 | Oil & Gas Operator | Dec 2021 |
| 14065 | Intoil, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2002 |
| 14066 | Intrepid Drilling, LLC | | Oil & Gas Operator | Jan 2025 |
| 14067 | Intrepid Energy Corporation | Independence, KS 67301 | Oil Operator | Mar 2016 |
| 14068 | Intrepid Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 14069 | Intrepid Operating LTD., Co | Hobbs, NM 88241 | Oil & Gas Operator | Nov 2009 |
| 14070 | Intrepid Production Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 14071 | Investco Oil And Gas Inc | | Oil & Gas Operator | Jan 2025 |
| 14072 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Jul 2025 |
| 14073 | Investment Land Services Inc | | Oil Operator | Oct 2001 |
| 14074 | Investment Operating Co | Stillwater, OK 74075-8572 | Oil Operator | Jun 2025 |
| 14075 | Investment Trends Corp. | | Gas Operator | Mar 1988 |
| 14076 | Investors Drilli | | Gas Operator | Jan 1993 |
| 14077 | Investors Oil, Inc. | | Oil Operator | Mar 1985 |
| 14078 | Investors Resources Corp | Edmond, OK 73034 | Oil & Gas Operator | Jul 2025 |
| 14079 | Invitation Energy, Incorporated | | Oil & Gas Operator | Dec 2021 |
| 14080 | Invito Operating, LLC | McKinney, TX 75070 | Oil & Gas Operator | Jun 2025 |
| 14081 | Invoil, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2025 |
| 14082 | Iochem Corporation | Oklahoma City, OK 73118-7483 | Oil & Gas Operator | Jul 2025 |
| 14083 | Ioe Acres V LLC | Perry, NY 14530 | Gas Operator | Dec 2024 |
| 14084 | Iola Wildcat LLC | Kansas City, MO 64190 | Oil Operator | May 2025 |
| 14085 | Iowa Production Company, Inc. | | Oil & Gas Operator | Jan 1992 |
| 14086 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 14087 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Sep 2025 |
| 14088 | Ipas Oil Company LLC | Pratt, KS 67124 | Oil Operator | Dec 2019 |
| 14089 | Ipr Energy Partners, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Aug 2014 |
| 14090 | Ipr Energy Partners, LLC | Bowie, TX 76230 | Oil & Gas Operator | Sep 2025 |
| 14091 | Ipr USA Corp. | Irving, TX 75039 | Oil & Gas Operator | Jun 2009 |
| 14092 | Ipt Oil Company | Evansville, IN 47706 | Oil & Gas Operator | Sep 2025 |
| 14093 | Ira Oil & Gas LLC | Addison, TX 75001 | Oil & Gas Operator | Jul 2008 |
| 14094 | Ira Testers | Ira, TX 79527 | Oil & Gas Operator | Mar 2024 |
| 14095 | Ira Testers, LLC | Ira, TX 79527 | Oil Operator | Sep 2025 |
| 14096 | Irani Engineering | | Gas Operator | Dec 1995 |
| 14097 | Irene L. Heary Irrevocable Trust | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 14098 | Irex Corporation | Englewood, CO 80111 | Oil & Gas Operator | May 2000 |
| 14099 | Irion Corporation, The | San Angelo, TX 76906 | Oil & Gas Operator | Jun 2021 |
| 14100 | Irish City Oil & Gas, Inc. | Wimberley, TX 78676 | Oil & Gas Operator | Sep 2025 |