| Ithaka Group Holdings Limited | Financial services | 2022 |
| Ithink Analytics Limited | Information & communication | 2011 |
| Itips UK Bidco Limited | Financial services | 2023 |
| Itrend Medical Research Limited | Health & social care | 2016 |
| ITS Project Management Ltd | Professional & scientific | 2016 |
| Ittai Limited | Manufacturing | 2012 |
| Iturus Limited | Information & communication | 2015 |
| ITV Solutions Limited | Transport & logistics | 2021 |
| IV Collective Ltd | Hospitality | 2026 |
| IV Group Holdings Limited | Financial services | 2024 |
| IV ISO Limited | Other services | 2024 |
| IV Training Limited | Other services | 2024 |
| Ivaglo Ltd | Wholesale & retail | 2024 |
| IVN Food Ltd | Hospitality | 2025 |
| Ivolve Wellbeing Ltd | Arts & recreation | 2020 |
| Ivor Shaw Limited | Manufacturing | 1963 |
| Ivory (Eco) Ltd | Agriculture & fishing | 2021 |
| IVY & Normanton Limited | Wholesale & retail | 2019 |
| IVY Developers Ltd | Construction | 2022 |
| IVY Lifestyle Ltd | Real estate | 2022 |
| IVY Retail & Brokerage Ltd | Wholesale & retail | 2025 |
| IVY Tech Ltd | Information & communication | 2019 |
| Ivygate Estates Ltd | Real estate | 2019 |
| Ivygrove Developments Limited | Construction | 1976 |
| Ivygrove Estates Limited | Real estate | 2024 |
| Ivygrove Limited | Construction | 1989 |
| Ivywood Developments Ltd | Real estate | 2021 |
| Ivywood Property Group Ltd | Real estate | 2022 |
| IWO PL Ltd | Transport & logistics | 2024 |
| IX Interiors Ltd | Professional & scientific | 2024 |
| Ixion System Engineering (Europe) Ltd | Construction | 2012 |
| Iyan Ltd | Hospitality | 2023 |
| Iylo Ltd | Information & communication | 2024 |
| Izaan Fast Food Ltd | Hospitality | 2021 |
| Izenterprise Ltd | Wholesale & retail | 2026 |
| Izhaan.H.B Limited | Health & social care | 2026 |
| Izinto Ltd | Wholesale & retail | 2024 |
| Izuit Ltd | Information & communication | 2025 |
| Izza Pizza (Wollaton) Ltd | Hospitality | 2022 |
| Izzy Properties (Midlands) Ltd | Real estate | 2025 |
| J & B Windows Limited | Construction | 2013 |
| J & D Plumbing and Heating Services Ltd | Construction | 2026 |
| J & G Electrical Contractors Ltd | Construction | 2023 |
| J & H Hauliers Ltd | Transport & logistics | 2021 |
| J & J Motors Derby Limited | Wholesale & retail | 2023 |
| J & J Wong Limited | Construction | 2021 |
| J & K Developments Limited | Construction | 1998 |
| J & M Coachworks Ltd | Wholesale & retail | 2022 |
| J & P Design and Construction Limited | Extraterritorial | 2011 |
| J & R Croft Limited | Wholesale & retail | 2022 |
| J & S Building Services Derby Ltd | Construction | 2021 |
| J a Drew Building Contractors Limited | Construction | 1978 |
| J a O’Toole Manufacturing Consultancy Limited | Professional & scientific | 2018 |
| J a Stiff Limited | Financial services | 2014 |
| J Abrahams Fabric Ltd | Wholesale & retail | 2024 |
| J and O Bespoke Joinery Limited | Manufacturing | 2014 |
| J Britten Limited | Information & communication | 2017 |
| J C Fairs Management Limited | Arts & recreation | 2004 |
| J C S L Limited | Arts & recreation | 2011 |
| J C Webster Limited | Financial services | 2013 |
| J C Weeks Consulting Limited | Financial services | 2022 |
| J D Evans Properties Ltd | Real estate | 2019 |
| J D F Flooring Ltd | Construction | 2003 |
| J D Grossart Limited | Professional & scientific | 2017 |
| J D R Business Coaches Limited | Information & communication | 2004 |
| J D Tile Limited | Wholesale & retail | 2026 |
| J Dudley Composites Ltd | Manufacturing | 2026 |
| J E Wall and SON Limited | Manufacturing | 2004 |
| J Eyre Ltd | Construction | 2010 |
| J F Bennett Contractors Limited | Construction | 2003 |
| J Foster Send Consultancy Ltd | Education | 2019 |
| J G R Distribution Limited | Transport & logistics | 2006 |
| J Grant Construction Ltd | Construction | 2025 |
| J H Evolutions Limited | Construction | 2017 |
| J H Poynton & Sons Limited | Administrative & support | 2010 |
| J Hood Engineering Ltd | Professional & scientific | 2022 |
| J I Transport Services Limited | Transport & logistics | 2014 |
| J J Guitars Limited | Manufacturing | 2007 |
| J J Hood Limited | Manufacturing | 2018 |
| J J N Building Services Limited | Construction | 2002 |
| J K Midland Services Ltd | Wholesale & retail | 2020 |
| J L Psychotherapy Ltd | Health & social care | 2022 |
| J Levin Legal Costs Limited | Professional & scientific | 2021 |
| J M Day Limited | Construction | 2015 |
| J M Peters Ltd | Hospitality | 2019 |
| J M W Investments Limited | Real estate | 2010 |
| J Marine Ltd | Arts & recreation | 2005 |
| J MAX GAS & Plumbing Ltd | Construction | 2019 |
| J Mbenda Limited | Health & social care | 2015 |
| J P Chippy Limited | Hospitality | 2024 |
| J P Derry Motor Engineers Limited | Wholesale & retail | 2014 |
| J Penn Limited | Financial services | 2006 |
| J Perry Limited | Other services | 2006 |
| J Property Ltd | Real estate | 2019 |
| J R Properties Lettings Ltd | Real estate | 2015 |
| J S Coxon Limited | Administrative & support | 2016 |
| J Sandhu Holdings Ltd | Financial services | 2026 |
| J Smallman Limited | Professional & scientific | 2006 |
| J T W Investments Limited | Professional & scientific | 2022 |
| J Venture Property Ltd | Real estate | 2022 |