| Illuminaunty Limited | Information & communication | 2026 |
| Illy Project Limited | Construction | 2017 |
| ILM Bespoke Carpentry Ltd | Manufacturing | 2025 |
| ILM Industrial Automation Ltd | Wholesale & retail | 2025 |
| Ilumense Ltd | Manufacturing | 2021 |
| Ilyas Property Holdings Ltd | Real estate | 2026 |
| IM Appliances Limited | Wholesale & retail | 2024 |
| IM Creative Ltd | Professional & scientific | 2022 |
| IM Nails Academy Ltd | Other services | 2023 |
| IM Roofing & Maintenance Limited | Construction | 2025 |
| Im's Study Advisers Ltd | Education | 2019 |
| IM. Roofing Services Limited | Construction | 2014 |
| Imacom Limited | Professional & scientific | 2018 |
| Imad Eshop Limited | Wholesale & retail | 2025 |
| Image and Natural Law Ltd | Arts & recreation | 2000 |
| Images (Gants Hill) Management Company Limited | Extraterritorial | 2007 |
| Imagin Limited | Other services | 2017 |
| Imaginary Threads Ltd | Wholesale & retail | 2026 |
| Imaginary Walk Ltd | Wholesale & retail | 2024 |
| Imagination Realised Ltd | Professional & scientific | 2024 |
| Imagine International Ltd | Administrative & support | 2022 |
| Imago Health and Safety Consultants Ltd | Professional & scientific | 2019 |
| Imaintain Building Service Ltd | Construction | 2026 |
| Iman and Hashim Halal Food Limited | Hospitality | 2024 |
| Imanimation Studios Ltd | Information & communication | 2008 |
| Imanimaya Private Limited | Real estate | 2024 |
| Imap Daycare Ltd | Real estate | 2018 |
| Imara U.K. Limited | Construction | 1990 |
| Imat Properties Limited | Real estate | 2023 |
| IMB Build Solution Ltd | Construction | 2025 |
| Imco Security Ltd | Construction | 2023 |
| Imfexa Limited | Wholesale & retail | 2026 |
| Imhp Group Real Estate Ltd | Real estate | 2021 |
| IMI Global Consultancy Ltd | Professional & scientific | 2024 |
| Imiassetinvestments Ltd | Real estate | 2022 |
| Imindstech Ltd | Information & communication | 2012 |
| Imjustagirly Limited | Wholesale & retail | 2024 |
| IMK Advisors Limited | Real estate | 2021 |
| IML Mortgages Ltd | Financial services | 2025 |
| Immaanuveel | Information & communication | 2009 |
| Immaculate Dwellings Limited | Real estate | 2022 |
| Immaculate Holdings Limited | Real estate | 2022 |
| Immerse Group Ltd | Professional & scientific | 2026 |
| Immigration Hour Services Limited | Professional & scientific | 2025 |
| Immortal Construction Limited | Construction | 2021 |
| Immpact Services Ltd | Transport & logistics | 2014 |
| Immu Designs Ltd | Construction | 2024 |
| Immy Services Ltd | Administrative & support | 2023 |
| Imobilestore Limited | Other services | 2015 |
| Impact Care Services Limited | Administrative & support | 2013 |
| Impact Marketing Global Limited | Other services | 2016 |
| Impact Newstech Limited | Information & communication | 2018 |
| Impact Premium Data Limited | Information & communication | 2025 |
| Impact Retailing Ltd | Professional & scientific | 2005 |
| Impactify Research & Consulting Ltd | Professional & scientific | 2024 |
| Impactologists Limited | Professional & scientific | 2023 |
| Imperfix Ltd | Construction | 2025 |
| Imperial Build Services Limited | Construction | 2018 |
| Imperial Care Holdings Limited | Financial services | 2023 |
| Imperial Cars(Uk) Ltd | Wholesale & retail | 2018 |
| Imperial Drywall & Ceiling Ltd | Construction | 2011 |
| Imperial Graduate School Ltd | Education | 2026 |
| Imperial INT Limited | Wholesale & retail | 2024 |
| Imperial Lodge Limited | Real estate | 2024 |
| Imperial Motors Group Ltd | Wholesale & retail | 2022 |
| Imperial Offices UK Ltd | Administrative & support | 2008 |
| Imperial Operations Ltd | Administrative & support | 2026 |
| Imperial Plates London Ltd | Wholesale & retail | 2026 |
| Imperial Properties INT Ltd | Real estate | 2014 |
| Imperial Properties London Limited | Construction | 2014 |
| Imperial Properties UK London Limited | Construction | 2025 |
| Imperial Security & FM Ltd | Administrative & support | 2026 |
| Imperial Shine Ltd | Administrative & support | 2025 |
| Imperial Trade Group Ltd | Manufacturing | 2025 |
| Imperium Health Ltd | Wholesale & retail | 2022 |
| Imperium Investments Limited | Real estate | 2026 |
| Imperium Watches & Jewels Ltd | Wholesale & retail | 2025 |
| Implicit Labs Limited | Information & communication | 2023 |
| Import&Export Cargo Limited | Transport & logistics | 2024 |
| Importwiseuk Ltd | Wholesale & retail | 2025 |
| Impress Nails Ltd | Other services | 2017 |
| Impressions by HC Ltd | Wholesale & retail | 2013 |
| Impulse Electrical Contractors Limited | Extraterritorial | 2024 |
| Imrali Inventions Limited | Manufacturing | 2017 |
| Imran Rafik Engineering Ltd | Other services | 2014 |
| Imza Property Services Ltd | Real estate | 2021 |
| IN Car Entertainment & Security Install Ltd | Wholesale & retail | 2015 |
| IN Foods Limited | Wholesale & retail | 2019 |
| IN Investment Group Limited | Financial services | 2021 |
| IN Safe Hands (Wellbeing) Ltd. | Information & communication | 2019 |
| IN5PIRE Group Ltd | Financial services | 2018 |
| INA Group Ltd | Wholesale & retail | 2015 |
| Ina's Delights Ltd | Manufacturing | 2025 |
| Inarah Consulting Ltd | Professional & scientific | 2026 |
| Inat Services UK Ltd | Wholesale & retail | 2017 |
| Inaya & Ayaan Ltd | Real estate | 2017 |
| Inayah Properties Ltd | Real estate | 2024 |
| Inayat Portfolio Ltd | Real estate | 2016 |
| Inayat Properties Limited | Real estate | 2014 |
| Inboxer Ltd | Professional & scientific | 2024 |