| Ilux Services Limited | Wholesale & retail | 2022 |
| Iluz Property Ltd | Real estate | 2024 |
| Ilyas Big Shop Ltd | Wholesale & retail | 2025 |
| IM Asset Management Limited | Financial services | 2004 |
| IM Asset Management Nominees Limited | Financial services | 1999 |
| IM Asset Management Nominees Number Two Limited | Financial services | 1999 |
| IM Commercial Holdings Limited | Professional & scientific | 2014 |
| IM Empire Sports Ltd | Manufacturing | 2015 |
| IM Investments Holdings Limited | Professional & scientific | 2012 |
| IM Medics Limited | Health & social care | 2022 |
| IM Motor Dealers Limited | Wholesale & retail | 2024 |
| IM MPH Limited | Professional & scientific | 2010 |
| IM Property to LET Ltd | Financial services | 2026 |
| Im&M (EOT) Limited | Financial services | 2023 |
| Im&M (Holdings) Limited | Professional & scientific | 2013 |
| IMA Media Services Ltd | Professional & scientific | 2025 |
| Imaah Ltd | Transport & logistics | 2022 |
| Imaan Royale Hall Ltd | Hospitality | 2026 |
| Image Excellence Ltd | Information & communication | 2005 |
| Image Hair Fashions Ltd. | Other services | 2002 |
| Image Sign Studio Limited | Manufacturing | 2010 |
| Images Labels Limited | Wholesale & retail | 1990 |
| Imagine Construction Holdings Limited | Financial services | 2020 |
| Imagine Construction Services Ltd | Construction | 2015 |
| Imagine Engineering Consulting Limited | Professional & scientific | 2018 |
| Imagine INK Limited | Wholesale & retail | 2024 |
| Imaginebound Limited | Information & communication | 2020 |
| Imaginetask Limited | Information & communication | 2025 |
| Imagtech Ltd | Wholesale & retail | 2023 |
| Imaj Consultancy Limited | Health & social care | 2020 |
| Imamsons Holding Ltd | Financial services | 2024 |
| Iman Medical Ltd | Health & social care | 2021 |
| Imanager.Ai Ltd. | Information & communication | 2023 |
| IMB Dental Limited | Professional & scientific | 2015 |
| Imba ZEE UK Limited | Real estate | 2022 |
| IMC Geophysical Services Limited | Professional & scientific | 2016 |
| IMC Supplier Ltd | Wholesale & retail | 2025 |
| Imco Investments Limited | Financial services | 2011 |
| IMD Nutrition Limited | Health & social care | 2022 |
| IME Law Limited | Professional & scientific | 2014 |
| Imedical Technologies Ltd | Extraterritorial | 2010 |
| Imeg Estates Ltd | Real estate | 2023 |
| Imeg Trade Limited | Wholesale & retail | 2020 |
| IMG Innovations Limited | Information & communication | 2009 |
| IMG Solutions Group Ltd | Administrative & support | 2020 |
| IMJ Properties 1 Ltd | Financial services | 2019 |
| Imjustbesti Ltd | Other services | 2025 |
| Immaculate Conception Academy Trust | Education | 2014 |
| Immaculate Living Solutions Ltd | Administrative & support | 2024 |
| Immanuel Logistics Limited | Transport & logistics | 2023 |
| Immingham Health Care Limited | Health & social care | 2006 |
| Imoon UK Ltd | Wholesale & retail | 2024 |
| Imoves Active Education Ltd | Education | 2010 |
| Impact Carbides Partnership LP | | 2011 |
| Impact Machine Services Ltd | Manufacturing | 2021 |
| Impact Route Setting Ltd | Arts & recreation | 2020 |
| Impact Training 2017 Ltd | Health & social care | 2025 |
| Impel Services Limited | Transport & logistics | 2015 |
| Imperatrix Properties Limited | Real estate | 2021 |
| Imperfecta Limited | Information & communication | 2020 |
| Imperial Car and Van Sales Ltd | Wholesale & retail | 2024 |
| Imperial Health Ltd | Financial services | 2017 |
| Imperial Labs Ltd | Other services | 2022 |
| Imperial Select Ltd | Professional & scientific | 2021 |
| Implant Alternatives Ltd | Manufacturing | 2012 |
| Implant Practice Limited | Health & social care | 2010 |
| Improve Electrical Ltd | Construction | 2021 |
| Improved Wright Ltd | Water & waste | 2026 |
| Improvity Consulting Ltd | Manufacturing | 2019 |
| IMR Mechanical Services Midlands Ltd | Construction | 2023 |
| Imran Food Limited | Hospitality | 2019 |
| Imran Khan Ehsaas Education Centre UK Ltd | Health & social care | 2026 |
| Imrans Group Ltd | Hospitality | 2021 |
| Imtc Limited | Extraterritorial | 2008 |
| IN House Pizza Ltd | Administrative & support | 2017 |
| IN Progress Ventures Limited | Hospitality | 2025 |
| IN Safe Hands Care and Support Ltd | Public administration | 2019 |
| IN the Dark Limited | Manufacturing | 2010 |
| IN the Making Collective Limited | Wholesale & retail | 2026 |
| IN the Patterns Limited | Administrative & support | 2019 |
| IN the Sky With Diamonds Limited | Administrative & support | 2021 |
| IN the Sport Ltd | Wholesale & retail | 2020 |
| IN the Sweet Spot Ltd | Professional & scientific | 2017 |
| IN Touch Care Skills Limited | Education | 2016 |
| In-Grid Whites Ltd | Wholesale & retail | 2017 |
| In-House Surveys Limited | Construction | 2025 |
| In-Part Publishing Ltd | Information & communication | 2012 |
| In-Workforce Ltd | Information & communication | 2022 |
| In.Spiritu Ltd | Information & communication | 2024 |
| IN2CHANGE South Yorkshire Ltd | Education | 2010 |
| IN2MINDS Equinology Ltd | Professional & scientific | 2020 |
| INA Care Limited | Health & social care | 2024 |
| INA Marketing Ltd | Administrative & support | 2019 |
| Inadaiz. Ltd | Wholesale & retail | 2025 |
| Inanna Creative Limited | Arts & recreation | 2023 |
| Inawa Ltd | Construction | 2019 |
| Inbros Ltd | Professional & scientific | 2023 |
| Incadance Studio Ltd | Information & communication | 2025 |
| Incadia Investments Ltd | Real estate | 2026 |
| Incadia Limited | Hospitality | 2023 |