| 1 | I C Gas Amcana Inc | Tulsa, OK 74103-3713 | Oil & Gas Operator | Apr 1996 |
| 2 | I D Oil Company Inc | Sperry, OK 74073-9417 | Oil Operator | Jan 2013 |
| 3 | I T Enterprises Inc | Tulsa, OK 74170-0775 | Oil & Gas Operator | Mar 2011 |
| 4 | I-Mac Petroleum Service Inc | Bixby, OK 74008-3778 | Oil & Gas Operator | Apr 2020 |
| 5 | Icon Energy Company | Oklahoma City, OK 73156-1613 | Oil & Gas Operator | Aug 2025 |
| 6 | Icor Oil & Gas Of Okla LTD | Claremore, OK 74018-2132 | Oil & Gas Operator | Mar 2015 |
| 7 | Iep Kansas Gas, LLC | Burlington, CO 80807 | Oil & Gas Operator | Sep 2025 |
| 8 | Igleheart Warren | Edmond, OK 73034-8964 | Oil & Gas Operator | Jun 2016 |
| 9 | Ike Energy LLC | Stillwater, OK 74074-1745 | Oil & Gas Operator | Aug 2025 |
| 10 | Ikenberry Herman & Ikenberry | | Oil Operator | Jul 1999 |
| 11 | Illoma Oil Company Inc | Algonquin, IL 60102-1825 | Oil & Gas Operator | Mar 2015 |
| 12 | Impact Energy Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Oct 2025 |
| 13 | Imperial Petroleum Inc | Evansville, IN 47725 | Oil & Gas Operator | Jan 2005 |
| 14 | Imperium Energy Inc | Atlanta, TX 75551 | Oil & Gas Operator | Aug 2025 |
| 15 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 16 | Incline Production Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 2014 |
| 17 | Inda Oil Unlimited | Bartlesville, OK 74006 | Oil Operator | Dec 2023 |
| 18 | Indian Nation Energy Company | Wewoka, OK 74884-3456 | Oil & Gas Operator | Apr 2020 |
| 19 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Dec 2025 |
| 20 | Indian Territory Operating LLC | Salado, TX 76571 | Oil & Gas Operator | Jun 2025 |
| 21 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 22 | Indianola Oil Inc | Bartlesville, OK 74005 | Oil & Gas Operator | Aug 2000 |
| 23 | Indrex Inc | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2000 |
| 24 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 25 | Infinity Oil & Gas Inc | Nowata, OK 74048 | Oil Operator | Jun 1993 |
| 26 | Ingersoll Oil Inc | Hominy, OK 74035 | Oil & Gas Operator | Jun 2000 |
| 27 | Ingersoll Rosinbaum Oil Inc | | Oil & Gas Operator | Aug 2025 |
| 28 | Ingram Exploration Inc | Seminole, OK 74868 | Oil & Gas Operator | Aug 2025 |
| 29 | Injection Well Service | Lone Grove, OK 73443-0156 | Oil Operator | Apr 2005 |
| 30 | Inland Oil Corporation | Sapulpa, OK 74067 | Oil & Gas Operator | Sep 2025 |
| 31 | Inland Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 32 | Inman Oil LLC | Ruidoso, NM 88355 | Oil Operator | Aug 2025 |
| 33 | Integrated Energy Service Corp | Cleveland, OK 74020 | Oil & Gas Operator | Nov 1998 |
| 34 | Inter-States Oil & Gas Inc | Edmond, OK 73003-0023 | Oil & Gas Operator | Apr 2020 |
| 35 | Intergrated Drill & Expl Inc | Tulsa, OK 74136-1071 | Oil & Gas Operator | Sep 1994 |
| 36 | Intergy Production LLC | Edmond, OK 73083 | Oil & Gas Operator | Sep 2025 |
| 37 | International Energy Company LLC | Tulsa, OK 74136-3922 | Oil & Gas Operator | Aug 2025 |
| 38 | International Energy Corporation | Tulsa, OK 74136-3922 | Oil & Gas Operator | Dec 2018 |
| 39 | International Ventures Inc | Pogasa Springs, CO 81147 | Oil Operator | Jul 1996 |
| 40 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 41 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 42 | Interstate Operating LLC | Tulsa, OK 74101-0535 | Oil & Gas Operator | Aug 2013 |
| 43 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Sep 2025 |
| 44 | Investment Operating Co | Stillwater, OK 74075-8572 | Oil Operator | Aug 2025 |
| 45 | Investors Resources Corp | Edmond, OK 73034 | Oil & Gas Operator | Sep 2025 |
| 46 | Invoil, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2025 |
| 47 | Iochem Corporation | Oklahoma City, OK 73118-7483 | Oil & Gas Operator | Sep 2025 |
| 48 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 49 | Irex Corporation | Englewood, CO 80111 | Oil & Gas Operator | May 2000 |
| 50 | Iron Hawk Energy Group Joint Venture | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 51 | Iron Post Oil & Gas Co Inc | Bristow, OK 74010-4120 | Oil & Gas Operator | Sep 2025 |
| 52 | Iron Sights Operating, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 53 | Iron Star Energy LLC | Houston, TX 77037-1142 | Oil & Gas Operator | Aug 2025 |
| 54 | Isaacs Fairy J | Konawa, OK 74849-0134 | Oil Operator | Sep 2020 |
| 55 | Itr Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |