| Istanbul Barber 8A Ltd | Other services | 2026 |
| Istanbul Coffee Ltd | Hospitality | 2025 |
| Istanbul Restaurant Rusholme Ltd | Hospitality | 2025 |
| Istar Properties Ltd | Real estate | 2024 |
| Istet IT Ltd | Information & communication | 2025 |
| ISU Biopharma Consultancy Limited | Professional & scientific | 2014 |
| Isupli Ltd | Wholesale & retail | 2022 |
| Isw-It Limited | Information & communication | 2024 |
| Iszeo Limited | Financial services | 2022 |
| IT 8 Limited | Information & communication | 2021 |
| IT Bodz Limited | Information & communication | 2012 |
| IT Enabled Change Ltd | Information & communication | 2011 |
| IT Maaster Ltd | Information & communication | 2025 |
| IT Starpoint Limited | Information & communication | 2025 |
| IT Technology Solution Ltd | Other services | 2021 |
| IT Trade Services Limited | Wholesale & retail | 2014 |
| IT Trade Solution Ltd | Wholesale & retail | 2020 |
| IT Transformation Management Ltd | Information & communication | 2017 |
| IT Welder Ltd | Wholesale & retail | 2026 |
| It's My Way Ltd | Manufacturing | 2021 |
| It's NOT Cricket Ltd | Manufacturing | 2025 |
| It's NOT Games Ltd | Manufacturing | 2025 |
| Italek Ltd | Real estate | 2005 |
| Italentconsultancy Ltd | Administrative & support | 2016 |
| ITALIA4U Ltd | Hospitality | 2023 |
| Italian Coffee Bar Highfield Limited | Hospitality | 2024 |
| Italian Furniture Online Ltd | Wholesale & retail | 2010 |
| Italian Pizza and Kebab Limited | Hospitality | 2018 |
| Italian Step Ltd | Other services | 2016 |
| Italiano Leicester Limited | Hospitality | 2023 |
| Italiarail Limited | Administrative & support | 2010 |
| Itbulk Network Ltd | Wholesale & retail | 2024 |
| Itea Healthcare Limited | Health & social care | 2009 |
| Itech Repair Limited | Other services | 2007 |
| Itechprofessional Ltd | Construction | 2024 |
| Itechprofessional Technical Services Ltd | Manufacturing | 2026 |
| Iteq Consulting Limited | Information & communication | 2012 |
| Iterion Limited | Information & communication | 2025 |
| Iteru Travel Ltd | Hospitality | 2025 |
| Itmfitness Ltd | Arts & recreation | 2024 |
| Itology Limited | Information & communication | 2016 |
| Itop National Limited | Wholesale & retail | 2019 |
| ITP6 Ltd | Information & communication | 2025 |
| ITRADE30 Ltd | Information & communication | 2020 |
| ITS Hers Ltd | Wholesale & retail | 2024 |
| ITS My Desire Ltd | Wholesale & retail | 2022 |
| ITS Training and Consultancy Limited | Administrative & support | 2012 |
| Itsec Ltd | Information & communication | 2000 |
| Itshaber Ltd | Arts & recreation | 2019 |
| Itunnuaayo Limited | Health & social care | 2025 |
| ITZ Ride Ltd | Transport & logistics | 2025 |
| Iusm Construction Ltd | Construction | 2018 |
| Iuventius Limited | Construction | 2011 |
| IV Learning Ltd | Wholesale & retail | 2017 |
| IV Technology Ltd | Information & communication | 2021 |
| Ivalue Services Ltd | Information & communication | 2022 |
| Ivan Gaskell Media Ltd | Information & communication | 2011 |
| Ivan Pro Trans Limited | Transport & logistics | 2023 |
| Ivanica Limited | Information & communication | 1995 |
| Ivar Design Consultants Ltd | Professional & scientific | 2023 |
| Ivarmie Ltd | Real estate | 2021 |
| Ivaro Labs Ltd | Information & communication | 2025 |
| Ivastoyan Ltd | Other services | 2024 |
| IVG Holdings Ltd | Financial services | 2024 |
| Ivoclar-Vivadent Limited | Wholesale & retail | 1988 |
| Ivodia Home Ltd | Wholesale & retail | 2022 |
| Ivor Holmes Limited | Wholesale & retail | 1959 |
| Ivory House Leicester Ltd | Real estate | 2026 |
| Ivory Key Estates Ltd | Real estate | 2026 |
| Ivory Property Developments Ltd | Real estate | 2019 |
| Ivory Property Solutions Ltd | Real estate | 2014 |
| Ivrsal Ltd | Information & communication | 2020 |
| IVY Cosmetic Clinic Limited | Health & social care | 2020 |
| IVY Lodge Care Limited | Health & social care | 2003 |
| IVY Properties (Leicester) Ltd | Real estate | 2020 |
| Ivybank Care Limited | Health & social care | 2023 |
| Ivyi Rose Creations Ltd | Wholesale & retail | 2025 |
| Ivyjack Communications Limited | Professional & scientific | 2018 |
| Ivyjade Limited | Hospitality | 2023 |
| IW Infrastructure Consulting Ltd | Professional & scientific | 2025 |
| IWA Financial Planning Ltd | Financial services | 2019 |
| IWA Sushi Limited | Wholesale & retail | 2026 |
| IWL Group Limited | Financial services | 2023 |
| IWO Cosmetic Products Safety Solutions Ltd. | Professional & scientific | 2015 |
| Iworld Accessories Limited | Wholesale & retail | 2018 |
| Iwosan Care Solution Ltd | Health & social care | 2025 |
| Iwyb Ltd | Real estate | 2011 |
| IXL Events Centre Limited | Hospitality | 2018 |
| IY 11 Ltd | Real estate | 2025 |
| Iyen Ltd | Hospitality | 2025 |
| IYM Consultancy Ltd | Information & communication | 2026 |
| IYP Holdings Limited | Financial services | 2020 |
| IYP Properties Limited | Real estate | 2023 |
| Iyra Trading Ltd | Wholesale & retail | 2025 |
| Iyza Ltd | Wholesale & retail | 2023 |
| IZ Praedium Limited | Real estate | 2019 |
| Izdahir Media Group Ltd | Information & communication | 2025 |
| IZI Beauty Ltd | Wholesale & retail | 2019 |
| Izin Knittings Ltd | Wholesale & retail | 2025 |
| Izmah Ltd | Wholesale & retail | 2023 |