| IVA Holdings Ltd | Real estate | 2026 |
| Ivaani Limited | Construction | 2025 |
| Ivan Building Services Ltd | Construction | 2023 |
| Ivan Construct Ltd | Construction | 2022 |
| Ivan Tech Solutions Ltd | Information & communication | 2025 |
| Ivarm Limited | Information & communication | 2015 |
| Ivaylo Mitov Ltd | Transport & logistics | 2017 |
| Ivcorfa Ltd | Transport & logistics | 2021 |
| IVD Simplicity Ltd | Professional & scientific | 2023 |
| Iveo Group Ltd | Wholesale & retail | 2018 |
| Ives Holdings Ltd | Real estate | 2020 |
| Iveso Enterprises Ltd | Administrative & support | 2026 |
| IVF Plus Ltd | Health & social care | 2019 |
| Ivision Consulting Ltd | Professional & scientific | 2024 |
| Ivitro Ltd | Real estate | 2023 |
| IVL Flow Control Limited | Water & waste | 2023 |
| IVL Valves Limited | Manufacturing | 2022 |
| Ivor Investments Limited | Real estate | 2020 |
| Ivory Consulting & Research Limited | Administrative & support | 2008 |
| Ivory Flake Limited | Arts & recreation | 2005 |
| Ivory Housing Ltd | Real estate | 2025 |
| Ivory Leaf Ltd | Hospitality | 2024 |
| Ivory Pearl Nails & Beauty Ltd | Other services | 2026 |
| Ivory Refrigeration Ltd | Professional & scientific | 2021 |
| IVS Installation & Supply Ltd | Construction | 2024 |
| IVS Services Limited | Administrative & support | 2024 |
| IVT Ltd | Education | 2025 |
| IVU Traffic Technologies UK Limited | Information & communication | 1993 |
| IVY and Blues Ltd | Wholesale & retail | 2024 |
| IVY BEE Consulting Limited | Administrative & support | 2018 |
| IVY Birmingham Limited | Hospitality | 2024 |
| IVY Hearing Ltd | Wholesale & retail | 2025 |
| IVY Interactive Solutions Limited | Information & communication | 2025 |
| IVY Leaf Care Limited | Health & social care | 2014 |
| IVY League Properties Ltd | Real estate | 2025 |
| IVY Leasehold Properties Limited | | 1944 |
| IVY Legacy Care Ltd | Health & social care | 2023 |
| IVY Marketing & Consulting Ltd | Hospitality | 2016 |
| IVY Panact Home Creations Ltd | Wholesale & retail | 2022 |
| IVY R&C Ltd | Wholesale & retail | 2016 |
| IVY Road Ltd | Information & communication | 2020 |
| IVY Tower Ltd | Households | 2023 |
| IVY Wyre Eyecare Limited | Wholesale & retail | 2025 |
| Ivybae Care Limited | Health & social care | 2020 |
| Iwatch (UK) Limited | Other services | 2013 |
| Iwave Pro Ltd | Wholesale & retail | 2022 |
| IWC Financial Ltd | Financial services | 2016 |
| IWC Investments Ltd | Real estate | 2021 |
| IWJ Marketplace Ltd | Wholesale & retail | 2025 |
| Iwjenterprise Ltd | Administrative & support | 2025 |
| IWM Holdings Limited | Financial services | 2016 |
| IWP Advisory Group Limited | Financial services | 2020 |
| IWP Advisory Services Limited | Financial services | 2007 |
| IWP Hunter Hammond Limited | Professional & scientific | 2020 |
| IWT1 Limited | Professional & scientific | 2000 |
| IXX Limited | Health & social care | 2026 |
| Ixxos Search Consultancy Limited | Financial services | 2017 |
| IY Cooperation Star Ltd | Wholesale & retail | 2026 |
| IY Fashions Ltd | Wholesale & retail | 2021 |
| IY Transport Ltd | Transport & logistics | 2025 |
| Iyansan Ventures Limited | Information & communication | 2017 |
| Iybs Developments Limited | Construction | 2021 |
| Iyce Desserts Ltd | Hospitality | 2021 |
| IYF Ltd | Wholesale & retail | 2025 |
| Iyke Ventures Ltd | Transport & logistics | 2025 |
| Iymo Limited | Wholesale & retail | 2018 |
| Iyoha Associates Ltd | Construction | 1999 |
| Iyoja Limited | Other services | 2014 |
| IYP UK Limited | Information & communication | 2015 |
| IYP X Limited | Information & communication | 2020 |
| IYR Trading Ltd | Manufacturing | 2022 |
| Iytal Village Ltd | Construction | 2021 |
| IZ Khan Ltd | Construction | 2025 |
| IZ Shah Limited | Health & social care | 2023 |
| Izaan Creative Ltd | Wholesale & retail | 2024 |
| Izakaya Kings Cross Limited | Hospitality | 2022 |
| Izakaya Soho Limited | Hospitality | 2018 |
| IZI Enterprises Limited | Hospitality | 2011 |
| Izmir Health (UK) Ltd | Health & social care | 2020 |
| Izon Enterprises Limited | Real estate | 2025 |
| Izons and Company Limited | Real estate | 1904 |
| Izyaan Property Ltd | Real estate | 2026 |
| Izzabel Beauty Limited | Other services | 2025 |
| Izzeal Limited | Real estate | 2025 |
| Izzi Global Ltd | Manufacturing | 2024 |
| Izzy Care Solutions Ltd | Health & social care | 2021 |
| Izzy Heating & Plumbing Ltd | Construction | 2023 |
| Izzy Tours Ltd | Administrative & support | 2017 |
| Izzy's Bootyque Limited | Manufacturing | 2021 |
| J & a Motor Trade Ltd | Wholesale & retail | 2016 |
| J & a Portfolio Ltd | Construction | 2019 |
| J & a Site Services Ltd | Construction | 2018 |
| J & Co Finance Ltd | Information & communication | 2015 |
| J & Co Trading Ltd | Wholesale & retail | 2022 |
| J & D Container Line Limited | Transport & logistics | 2001 |
| J & D Delice Limited | Hospitality | 2019 |
| J & D Mason Opticians Limited | Wholesale & retail | 2014 |
| J & E Consulting UK Ltd | Transport & logistics | 2025 |
| J & Grey Ltd | Real estate | 2023 |
| J & H Greentech and Trading Ltd | Manufacturing | 2011 |