| Image 90 Limited | Manufacturing | 2006 |
| Image DNA Limited | Professional & scientific | 2024 |
| Imagine Anything Limited | Information & communication | 2024 |
| Imamt.K Ltd | Wholesale & retail | 2026 |
| Imarisha Coffee Company Limited | Manufacturing | 2025 |
| Imerald Equine Ltd | Professional & scientific | 2024 |
| Imersual Ltd | Information & communication | 2025 |
| Immense Holdings Group Ltd | Wholesale & retail | 2026 |
| Immense Motors Limited | Wholesale & retail | 2023 |
| Immersive Senses Ltd | Manufacturing | 2025 |
| Immigration and Law Experts Ltd | Professional & scientific | 2025 |
| Immigration Link Ltd | Other services | 2019 |
| Immigration Professionals Ltd | Professional & scientific | 2023 |
| Imogenroseeducation Ltd | Education | 2025 |
| Imogenrosesalon Ltd | Other services | 2022 |
| Impact Community Gym CIC | Arts & recreation | 2014 |
| Impact Detect Ltd | Wholesale & retail | 2020 |
| Imperial Corals Limited | Agriculture & fishing | 2025 |
| Imperial Flooring Ltd | Wholesale & retail | 2022 |
| Imperial Management Group Limited | Construction | 2019 |
| Imperial Properties (SOT) Limited | Real estate | 2009 |
| Imperio Consultancy Ltd | Professional & scientific | 2024 |
| Imprint Trait Ltd | Construction | 2020 |
| Impudence Limited | Information & communication | 2017 |
| IMW Decorating Ltd | Construction | 2023 |
| IN Ceramics Limited | Wholesale & retail | 2015 |
| IN Demand Developments Limited | Construction | 2024 |
| IN Home Carpets Ltd | Wholesale & retail | 2020 |
| IN Home Carpets South Staffs Ltd | Wholesale & retail | 2021 |
| IN the Moment Ltd | Other services | 2024 |
| IN Your Sights Limited | Wholesale & retail | 2014 |
| IN2 Kitchens & Bedrooms Ltd | Manufacturing | 2024 |
| IN2 Trade Limited | Wholesale & retail | 2017 |
| IN2HEALTH & Wellbeing CIC | Arts & recreation | 2021 |
| Inadequate Brewery Ltd | Manufacturing | 2026 |
| Inarah Kabir Limited | Transport & logistics | 2025 |
| Inarahs Fine Foods Limited | Manufacturing | 2021 |
| Inayat Traders Limited | Wholesale & retail | 2025 |
| Inboxguard Ltd | Information & communication | 2026 |
| Inc Architects Limited | Professional & scientific | 2017 |
| Inchala Communication Limited | Professional & scientific | 2025 |
| Inchallah Ltd | Professional & scientific | 2017 |
| Inclusia Living Limited | Health & social care | 2026 |
| Incore Health Ltd | Manufacturing | 2025 |
| Incredible INK Tattoo Studio Limited | Other services | 2023 |
| IND Mart Ltd | Wholesale & retail | 2024 |
| Indefinite Healthcare Ltd | Health & social care | 2024 |
| Independent Asbestos Surveys and Services Ltd | Professional & scientific | 2012 |
| Independent Candidates Group Ltd | Other services | 2026 |
| INDIA2UK Edubridge Limited | Education | 2025 |
| Indian Heaven Cheshire Ltd | Hospitality | 2025 |
| Indian Spice (Stoke) Ltd | Wholesale & retail | 2020 |
| Indian Spice Newcastle Limited | Hospitality | 2026 |
| Indo Brit Co Ltd | Wholesale & retail | 2024 |
| Indus Car Sales Ltd | Wholesale & retail | 2024 |
| Industrial Electronic Services Limited | Manufacturing | 1997 |
| Industrial Electronics Holdings Limited | Professional & scientific | 2008 |
| Industrial Pipeline Solutions Limited | Manufacturing | 2004 |
| Industry Asset Services Limited | Wholesale & retail | 2020 |
| Ineco Solutions Limited | Transport & logistics | 2017 |
| Inedge Solutions Ltd | Wholesale & retail | 2023 |
| Infernal Sounds Ltd | Information & communication | 2016 |
| Infinite Motion Ltd | Transport & logistics | 2023 |
| Infinite Property Ventures Limited | Real estate | 2019 |
| Infinitepropertymanagment Ltd | Households | 2025 |
| Infinitum Global Ltd | Information & communication | 2019 |
| Infinity Bathrooms Limited | Construction | 2023 |
| Infinity Hive Ltd | Wholesale & retail | 2014 |
| Infinity Merchant Limited | Wholesale & retail | 2020 |
| Infinity Nail and Beauty ST7 Ltd | Other services | 2025 |
| Infinity RK Ltd | Information & communication | 2022 |
| Infisup Ltd | Information & communication | 2025 |
| Infraea Ltd | Health & social care | 2025 |
| Infratech Engineering Limited | Construction | 2023 |
| Ingestre Property Management Limited | Households | 2002 |
| Ingots of Tunstall Limited | Wholesale & retail | 2014 |
| Inia Matakibau Limited | Professional & scientific | 2022 |
| Inktec UK Ltd | Professional & scientific | 1997 |
| Inkwell Store Ltd | Wholesale & retail | 2025 |
| Inlinx Limited | Other services | 2017 |
| Inner Insight Hypnosis Limited | Health & social care | 2026 |
| Innernova Ltd | Information & communication | 2021 |
| INNOV8 Cleaning Solutions Limited | Administrative & support | 2012 |
| Innovagrip Ltd | Extraterritorial | 2025 |
| INNOVAT3D Ltd | Professional & scientific | 2025 |
| Innovatech Precision Engineering Ltd | Manufacturing | 2025 |
| Innovationup Ltd | Manufacturing | 2021 |
| Innovative Home Renovation Sources Ltd | Construction | 2026 |
| Innovue Limited | Health & social care | 2015 |
| Inorganic Pigments Limited | Manufacturing | 1961 |
| Inpress PPE Limited | Manufacturing | 2011 |
| Inside Design and Joinery Ltd | Construction | 2025 |
| Inside OUT Property & Landscape Services Ltd | Construction | 2017 |
| Insight Trading House Ltd | Real estate | 2024 |
| Insignificant Music Ltd | Information & communication | 2005 |
| Insolvency Practitioners Direct Limited | Administrative & support | 2002 |
| Inspection Technology Ltd | Manufacturing | 2019 |
| Inspiramedic Limited | Health & social care | 2015 |
| Inspirational Learning Academies Trust | Education | 2013 |
| Inspire Accommodation Ltd | Real estate | 2026 |