| IHC Enterprise Ltd | Wholesale & retail | 2023 |
| Ihsan & Sons Ltd | Wholesale & retail | 2022 |
| IHT Estates Limited | Real estate | 2017 |
| Ihvn Ltd | Real estate | 2009 |
| IHZ Capital Ltd | Real estate | 2025 |
| IK Build Solution Ltd | Construction | 2025 |
| IK804 Limited | Education | 2024 |
| Ikam Property Limited | Real estate | 2010 |
| Ikamet Limited | Wholesale & retail | 2021 |
| Ikeella Solutions Limited | Information & communication | 2025 |
| Ikhlas Ltd | Wholesale & retail | 2021 |
| Ikigai Way Limited | Information & communication | 2025 |
| Ikmk Traders Limited | Wholesale & retail | 2019 |
| Ikonkar Construction Ltd Limited | Construction | 2026 |
| Ikram HAQ Property Consultant Ltd | Real estate | 2015 |
| IKU Ltd | Information & communication | 2019 |
| IL Cortile Ristorante Italiano Ltd | Hospitality | 2026 |
| ILA Asia Limited | Wholesale & retail | 2014 |
| Ilando UK Ltd | Transport & logistics | 2026 |
| Ilaysar Vehicle Services Ltd | Wholesale & retail | 2026 |
| Ileikasa Ltd | Construction | 2017 |
| Ilex Traders Ltd | Wholesale & retail | 2025 |
| Illuminate Cleaning Company Limited | Administrative & support | 2024 |
| Illusive Jewels Limited | Wholesale & retail | 2024 |
| Ilsah Style Ltd | Wholesale & retail | 2024 |
| Ilysian Care Group Ltd | Health & social care | 2025 |
| Ima-Uk Solutions Ltd | Information & communication | 2010 |
| Imaginari Ltd. | Professional & scientific | 2013 |
| Imak IT Support Limited | Other services | 2012 |
| Imam Builders Limited | Construction | 2025 |
| Iman Delivery Ltd | Transport & logistics | 2017 |
| Imani Business Services Ltd | Administrative & support | 2024 |
| Imarra Services Ltd | Real estate | 2023 |
| Imediat Limited | Wholesale & retail | 1994 |
| IMK Consultancy Services Ltd | Information & communication | 2023 |
| IMK Estates Limited | Real estate | 2024 |
| Immacolata House Care Limited | Health & social care | 2020 |
| Immaculate Accounting Services Limited | Professional & scientific | 2015 |
| Immersive Vision Technologies Limited | Extraterritorial | 2024 |
| Immersol Ltd | Information & communication | 2020 |
| Immortal Bootcamp Limited | Arts & recreation | 2015 |
| Imove Express Ltd | Transport & logistics | 2024 |
| Impact Cleaners and Removals Ltd | Administrative & support | 2020 |
| Impact Cleaners Limited | Administrative & support | 2026 |
| Impact Finance Ltd | Administrative & support | 2023 |
| Imperial Automotives Ltd | Wholesale & retail | 2023 |
| Imperial Breeze Healthcare South East Limited | Health & social care | 2021 |
| Imperial Brickwork Contractors Ltd | Construction | 2021 |
| Imperial Capital & Wealth Management Ltd | Real estate | 2026 |
| Imperial Carpets Limited | Wholesale & retail | 2021 |
| Imperial Chauffeurs Limited | Transport & logistics | 2026 |
| Imperial Chemical Industries Limited | Manufacturing | 1926 |
| Imperial Coaches Limited | Transport & logistics | 2001 |
| Imperial Couture Ltd | Wholesale & retail | 2023 |
| Imperial Decor Limited | Other services | 2011 |
| Imperial Design Services Limited | Wholesale & retail | 2026 |
| Imperial Doubleglazing Limited | Professional & scientific | 2008 |
| Imperial Empire Holdings Limited | Real estate | 2019 |
| Imperial Empire Limited | Real estate | 2003 |
| Imperial Khan Ltd | Administrative & support | 2019 |
| Imperial Luxury Chauffeurs Ltd | Transport & logistics | 2025 |
| Imperial Skate Sharpening Ltd | Wholesale & retail | 2024 |
| Imperial Truck and BUS Ltd | Wholesale & retail | 2020 |
| Imperial Vehicle Contracts Ltd | Wholesale & retail | 2019 |
| Impexinnovationuk Limited | Wholesale & retail | 2023 |
| Import Produce Ltd | Wholesale & retail | 2022 |
| Important Export Ltd | Wholesale & retail | 2026 |
| Improvement Limited | Real estate | 2025 |
| Impulsive Residence Ltd | Administrative & support | 2022 |
| Imran Tandoori Wexham Ltd | Hospitality | 2021 |
| Imran,S Slough Ltd | Hospitality | 2026 |
| Imrans Trading Ltd | Wholesale & retail | 2022 |
| IMT Motors Limited | Wholesale & retail | 2023 |
| IMY Contractor Ltd | Construction | 2025 |
| IN Depth Services (Cleaning) Limited | Administrative & support | 1978 |
| IN Focus Cctv Limited | Administrative & support | 2006 |
| IN Hand Community Care Ltd | Administrative & support | 2023 |
| IN N OUT Autos Ltd | Wholesale & retail | 2024 |
| IN Time Ltd | Transport & logistics | 2015 |
| In-Furn Limited | Wholesale & retail | 2026 |
| IN2MED Ltd | Education | 2019 |
| INA Accountancy Services Limited | Professional & scientific | 2025 |
| Inamay Ltd | Real estate | 2013 |
| Inari Financial Services Limited | Professional & scientific | 2024 |
| Inayat Estates Ltd | Real estate | 2024 |
| Inca (London) Ltd | Hospitality | 2021 |
| Inclusive Experience Limited | Information & communication | 2021 |
| Incognito Security Limited | Administrative & support | 2002 |
| Incredible Window Cleaning Limited | Administrative & support | 2013 |
| Incredipay Ltd | Administrative & support | 2025 |
| Indaba Communications Limited | Professional & scientific | 2008 |
| Independent Facility Services Ltd | Administrative & support | 2017 |
| Independent Supported Living and Disabilities Ltd | Health & social care | 2012 |
| Inderpal Singh Bola Ltd | Extraterritorial | 2023 |
| India Business House Ltd | Professional & scientific | 2025 |
| Indiancurry.Com Limited | Information & communication | 2025 |
| Indigo Marketing Limited | Information & communication | 2008 |
| Indika Spice Ltd | Hospitality | 2025 |
| Indimed Global Ltd | Other services | 2023 |
| Indo-Fuji Europe Limited | Information & communication | 2003 |