| Impact Installations (UK) Ltd | Construction | 2024 |
| Impact Installs Ltd | Construction | 2025 |
| Impact Property Limited | Real estate | 2008 |
| Impact Retail Limited | Other services | 1995 |
| Impact Technical Services Ltd | Professional & scientific | 2011 |
| Impact&Toughbuild Property Maintenance Limited | Construction | 2012 |
| Impactful Foiling Limited | Manufacturing | 2022 |
| Impax Ltd | Other services | 2024 |
| Impelsys Ltd | Information & communication | 2023 |
| Imperial 38 Limited | Hospitality | 2026 |
| Imperial City Apartments Ltd | Households | 2025 |
| Imperial Corporate Events Holdings Limited | Financial services | 2024 |
| Imperial Corporate Events Ltd | Arts & recreation | 2002 |
| Imperial Design & Build Limited | Construction | 2018 |
| Imperial Driveways & Patios Ltd | Construction | 2026 |
| Imperial Fish Bar Ltd | Hospitality | 2024 |
| Imperial Gate Security Partnership Ltd | Administrative & support | 2026 |
| Imperial GB Limited | Extraterritorial | 1999 |
| Imperial Great British Consultants Limited | Extraterritorial | 2011 |
| Imperial Great British Design Limited | Administrative & support | 2011 |
| Imperial Great British Media Limited | Extraterritorial | 2011 |
| Imperial Homewares Limited | Extraterritorial | 2011 |
| Imperial Ice Cream Limited | Hospitality | 2019 |
| Imperial International Limited | Wholesale & retail | 1983 |
| Imperial Investments Inc Ltd | Real estate | 2023 |
| Imperial Lightings & Grips Ltd | Administrative & support | 2026 |
| Imperial Medics Limited | Administrative & support | 2016 |
| Imperial Orbit Motor Ltd | Wholesale & retail | 2026 |
| Imperial Plastering and DRY Lining Ltd | Construction | 2023 |
| Imperial Property Holdings PVT Ltd | Real estate | 2026 |
| Imperial Roofing Supplies UK Holdings Limited | Financial services | 2023 |
| Imperial Roofing Supplies UK Ltd | Wholesale & retail | 1999 |
| Imperial Solar Ltd | Construction | 2024 |
| Imperial Solar Solutions Ltd | Construction | 2022 |
| Imperial Transport Limited | Transport & logistics | 2015 |
| Imperial Trends Ltd | Wholesale & retail | 2024 |
| Imperial Wealth Advisory Ltd | Financial services | 2013 |
| Imperium Lxxxviii Ltd | Financial services | 2025 |
| Impex Tools Limited | Transport & logistics | 2016 |
| Import Export Morocco Limited | Wholesale & retail | 2019 |
| Impress Clothing Limited | Manufacturing | 1999 |
| Impress Software Limited | Information & communication | 2022 |
| Impress Workwear Ltd | Manufacturing | 2014 |
| Impressive Motors Limited | Wholesale & retail | 2021 |
| Imprint & Impress Limited | Professional & scientific | 2024 |
| Imprint Digital (Leicester) Ltd | Manufacturing | 2023 |
| Improve Holdings Limited | Financial services | 2018 |
| Improve Newco Limited | Financial services | 2022 |
| Improve Productions Limited | Information & communication | 2018 |
| Impsure Limited | Other services | 2016 |
| Impulse Clothing Limited | Manufacturing | 2002 |
| Impulse Investment Limited | Professional & scientific | 2010 |
| Imran Foods (Leicester) Limited | Hospitality | 2019 |
| Imranmedical Ltd | Health & social care | 2024 |
| Imrari Limited | Wholesale & retail | 2017 |
| Imras Technology Limited | Wholesale & retail | 2024 |
| Imrinn Investments Ltd | Real estate | 2012 |
| Imriz Ltd | Real estate | 2025 |
| IMS Hygiene Limited | Extraterritorial | 2020 |
| IMS Midlands Ltd | Real estate | 2015 |
| Imsush Limited | Health & social care | 2024 |
| Imtel Comms Limited | Manufacturing | 2013 |
| Imwajin Ltd | Information & communication | 2024 |
| IN Car Services Limited | Wholesale & retail | 2024 |
| IN Context Limited | Health & social care | 2023 |
| IN Conversation With JAS Ltd | Education | 2025 |
| IN Depth Project Management & Consulting Ltd | Information & communication | 2012 |
| IN Flow Events Limited | Administrative & support | 2012 |
| IN Foods Middlesbrough Limited | Hospitality | 2025 |
| IN Foods Middlesbrough VB Limited | Hospitality | 2026 |
| IN Gods Name Ltd | Real estate | 2026 |
| IN Ratio Limited | Administrative & support | 2025 |
| IN Safe Handles Limited | Wholesale & retail | 2021 |
| IN Situ Site Investigation Limited | Construction | 2007 |
| IN the Flow Health Limited | Health & social care | 2006 |
| IN the Knitwear Ltd | Manufacturing | 2020 |
| IN the TEN Ltd | Wholesale & retail | 2026 |
| IN Time Leicester Ltd | Other services | 2024 |
| IN Touch (Leic) Ltd | Manufacturing | 2019 |
| IN Uniq Ltd | Manufacturing | 2025 |
| IN Vision and CUE Ltd | Information & communication | 2018 |
| IN- Law Holdings Limited | Real estate | 2025 |
| In-Range Archery Limited | Wholesale & retail | 2015 |
| IN2 Property Ltd | Households | 2019 |
| IN2GRAL Consultancy Ltd | Information & communication | 2007 |
| IN2STORE Ltd | Administrative & support | 2020 |
| IN2UITIVE Ltd | Information & communication | 2025 |
| IN3D Ltd | Wholesale & retail | 2024 |
| INA Collection Ltd | Wholesale & retail | 2023 |
| Inara Loungewear Limited | Wholesale & retail | 2023 |
| Inari Sushi and Grill Limited | Hospitality | 2020 |
| Inaya Convenience Store Ltd | Wholesale & retail | 2025 |
| Inayas Technology Limited | Wholesale & retail | 2025 |
| Inbound Networks Limited | Information & communication | 2026 |
| Inc. Instore Limited | Construction | 2025 |
| Incardis Construction Limited | Construction | 2022 |
| Incentify Limited | Professional & scientific | 2021 |
| Inception Engineering Ltd | Administrative & support | 2017 |
| Inchlines Limited | Manufacturing | 1984 |
| Inci Catering Ltd | Hospitality | 2023 |