| Impel College Ltd | Education | 2026 |
| Impel College of London Ltd | Education | 2010 |
| Imperial 7 Chauffeurs Ltd | Transport & logistics | 2012 |
| Imperial Bedroom Kitchens Fitted Ltd | Construction | 2020 |
| Imperial Constructions Limited | Construction | 2026 |
| Imperial Distribution Limited | Wholesale & retail | 2024 |
| Imperial Global Foods Limited | Hospitality | 2019 |
| Imperial Kitchen and Wardrobe Limited | Manufacturing | 2023 |
| Imperial Plumbing and Heating Limited | Construction | 2015 |
| Imperial Touch London Ltd | Wholesale & retail | 2016 |
| Imperial West Academy and Partners Ltd | Education | 2016 |
| Imported Mart Items Limited | Wholesale & retail | 2025 |
| IN Motion Physiotherapy Ltd | Health & social care | 2025 |
| IN Property Irlam Ltd | Real estate | 2025 |
| IN Stitches Limited | Wholesale & retail | 2017 |
| IN91 Foods Ltd | Hospitality | 2025 |
| Inace Limited | Professional & scientific | 2006 |
| Inascope Media Ltd | Information & communication | 2024 |
| INB Cars Ltd | Wholesale & retail | 2023 |
| Incense Route Fragrances Co Ltd | Other services | 2023 |
| Incline Training Consultants Ltd | Public administration | 2013 |
| Inco-M Cleaning Service Ltd | Administrative & support | 2022 |
| Incredible India Restaurants Ltd | Hospitality | 2021 |
| Indara Limited | Wholesale & retail | 2025 |
| Independent Film Media & the Arts CIC | Information & communication | 2024 |
| Independent Landlord Ltd | Households | 2026 |
| Inder Empire Ltd | Wholesale & retail | 2021 |
| Inder Khatri Ltd | Construction | 2025 |
| Inder RAJ Ltd | Professional & scientific | 2021 |
| Inderjit Singh Ltd | Construction | 2013 |
| Inderpreet SS Limited | Real estate | 2025 |
| Indi Coaches Limited | Transport & logistics | 2017 |
| Indian Corner London Limited | Hospitality | 2021 |
| Indian Spice Kitchen Ltd | Hospitality | 2023 |
| Indology Limited | Information & communication | 2004 |
| Indostar Limited | Construction | 2022 |
| Industrial Commercial Ventures Limited | Real estate | 2024 |
| Inett Solutions Limited | Information & communication | 2017 |
| Infer Business Consultants Ltd | Professional & scientific | 2023 |
| Infibria Ltd | Information & communication | 2025 |
| Infinite Services Limited | Transport & logistics | 2005 |
| Infinity Deals Ltd | Wholesale & retail | 2023 |
| Infinity Estate Agents Ltd | Real estate | 2020 |
| Infinity Student Services Ltd | Education | 2020 |
| Infinity Vault Ltd | Hospitality | 2025 |
| Infinity VIS Ltd | Construction | 2025 |
| Infinity Workout Limited | Wholesale & retail | 2026 |
| Infinium Property Management Limited | Real estate | 2021 |
| INFO4TAMILS Media Limited | Professional & scientific | 2019 |
| Infotech International ( PVT ) Ltd | Information & communication | 2024 |
| Injoy Middle East Ltd | Health & social care | 2014 |
| Innotechuk Ltd | Wholesale & retail | 2024 |
| Innovative Financial Advisors Ltd | Financial services | 2024 |
| Innovative Inside Ltd | Information & communication | 2023 |
| Innovative Tax Consultant Ltd | Professional & scientific | 2023 |
| Inrad Heating Ltd | Construction | 2020 |
| Inrus Limited | Wholesale & retail | 2016 |
| Inside Scoop Limited | Professional & scientific | 2024 |
| Insight Office Services Limited | Administrative & support | 2010 |
| Inspirational Properties Limited | Real estate | 2017 |
| Inspire Home Construction Ltd | Construction | 2016 |
| Inspired Kitchens and Bedroom Ltd | Manufacturing | 2021 |
| Inspired Plumbing and Electric Limited | Wholesale & retail | 2020 |
| Insta Trade Ltd | Wholesale & retail | 2023 |
| Install Pro Services Ltd | Manufacturing | 2024 |
| Instamart Limited | Wholesale & retail | 2021 |
| Instance Save Ltd | Wholesale & retail | 2015 |
| Intaap Ltd | Information & communication | 2025 |
| Intelli Youth Limited | Information & communication | 2016 |
| Intensive Care Limited | Health & social care | 2021 |
| Inter Technic Ltd | Wholesale & retail | 2017 |
| Interchord Ltd | Manufacturing | 2019 |
| Intercity GAS Limited | Energy | 2010 |
| Interglobal Shipping Co. Ltd. | Transport & logistics | 2019 |
| Intermax Construction Ltd | Construction | 2023 |
| International Cargo Logistics Limited | Transport & logistics | 2004 |
| International Consortium for Safety Professionals - Icsp Ltd | Professional & scientific | 2026 |
| International Education Partners Ltd | Education | 2017 |
| International Healthcare Supplies Ltd | Other services | 2022 |
| International Hindi Society UK | Health & social care | 2013 |
| International Student Services CS Ltd | Education | 2016 |
| Interstar Building Contractors Limited | Construction | 2006 |
| Interstar Property Investments Ltd | Real estate | 2016 |
| Interwise Car Repairs Ltd | Wholesale & retail | 2016 |
| Intragas Ltd | Construction | 2015 |
| Intvat Ltd | Professional & scientific | 2025 |
| Invar Ltd | Manufacturing | 2026 |
| Inventory Clerk UK Ltd | Professional & scientific | 2024 |
| Invertex Traders Ltd | Wholesale & retail | 2018 |
| Investments & Lettings Ltd | Real estate | 2017 |
| Invictus Facilities Ltd | Administrative & support | 2023 |
| Inzamams Ltd | Wholesale & retail | 2025 |
| Iopsmon Limited | Information & communication | 2024 |
| IPM Accountants Limited | Professional & scientific | 2003 |
| IPM Management Ltd | Professional & scientific | 2015 |
| IPM Property Investments Ltd | Real estate | 2000 |
| IQ Electrical Installations Ltd | Construction | 2020 |
| Iqama Ltd | Hospitality | 2025 |
| Iqbal Property Estate Agent Limited | Real estate | 2025 |
| Iqbal Services Ltd | Professional & scientific | 2024 |