| ITR Retail Ltd | Wholesale & retail | 2024 |
| Itrust Properties Ltd | Real estate | 2023 |
| ITS ALL About Eco Limited | Wholesale & retail | 2020 |
| ITS Cold Inside Limited | Wholesale & retail | 2013 |
| ITS for Hire (Yorkshire) Limited | Administrative & support | 2013 |
| Iturn Ltd | Manufacturing | 2011 |
| Iuli-Gab Ltd | Transport & logistics | 2017 |
| IV Vitamin & Therapy Lounge Ltd | Health & social care | 2020 |
| IVC (Leeds) Limited | Wholesale & retail | 2003 |
| Ives Capital Limited | Financial services | 2018 |
| Ives Services Limited | Professional & scientific | 2021 |
| Ivorstop (1987) Limited | Extraterritorial | 1949 |
| Ivory Investment Property Ltd | Real estate | 2025 |
| Ivory Motors Ltd | Wholesale & retail | 2025 |
| Ivory Rose Lingerie Limited | Wholesale & retail | 2017 |
| IVY & Nad’S Estates Ltd | Real estate | 2024 |
| IVY and Oak Ltd | Real estate | 2025 |
| IVY Comms Ltd | Information & communication | 2024 |
| IVY FOX Media Limited | Professional & scientific | 2019 |
| IVY IVY Ltd | Hospitality | 2022 |
| IVY Lane Management Company Limited | Real estate | 2020 |
| IVY Park Court Owners' Association Limited | Households | 1978 |
| IWM (Admin) Ltd | Financial services | 2020 |
| Iwol Ltd | Arts & recreation | 2019 |
| Iwtw Ltd | Hospitality | 2025 |
| Izen Ltd | Wholesale & retail | 2017 |
| Izna Co PVT Ltd | Wholesale & retail | 2026 |
| IZZ Ltd | Health & social care | 2022 |
| Izzosew Studio Ltd | Professional & scientific | 2021 |
| Izzza Online Ltd | Wholesale & retail | 2023 |
| Izzzabynaz Limited | Wholesale & retail | 2023 |
| J & B Limited | Hospitality | 2003 |
| J & C Domestic Property Maintenance Limited | Construction | 2015 |
| J & C Podiatry Ltd | Health & social care | 2022 |
| J & D Building Services Ltd | Administrative & support | 2018 |
| J & D DUO Jewellery (Eldon Square) Limited | Wholesale & retail | 2015 |
| J & D DUO Jewellery (Meadowhall) Limited | Wholesale & retail | 2015 |
| J & D DUO Jewellery (Trinity Walk) Ltd | Wholesale & retail | 2018 |
| J & D DUO Jewellery (White Rose) Limited | Wholesale & retail | 2015 |
| J & D DUO Jewellery Limited | Wholesale & retail | 2013 |
| J & D Installations (Yorkshire) Limited | Construction | 2020 |
| J & F a Limited | Real estate | 2016 |
| J & G Fencing Services Ltd | Administrative & support | 2006 |
| J & G Property Limited | Real estate | 2003 |
| J & G Services (Yorkshire) Limited | Administrative & support | 2014 |
| J & J Crump & SON Ltd | Construction | 2001 |
| J & KD Ltd | Hospitality | 2019 |
| J & LK Holdings Limited | Manufacturing | 2023 |
| J & M Commercials Limited | Wholesale & retail | 2012 |
| J & M Leisure Ltd | Arts & recreation | 2024 |
| J & S C Dunham Ltd | Hospitality | 2022 |
| J & S Cleaning Solutions Ltd | Administrative & support | 2025 |
| J & S Electrical Engineering Services Ltd | Construction | 2021 |
| J & S Langham Limited | Wholesale & retail | 2002 |
| J & S Sales & Services Limited | Extraterritorial | 2015 |
| J & T Flooring Limited | Construction | 2017 |
| J & V Cleaning Services Limited | Administrative & support | 2019 |
| J a Horne Starlight Limited | Manufacturing | 2004 |
| J a Richards Construction Ltd | Construction | 2006 |
| J a S Contractors Ltd | Construction | 2007 |
| J a Taylor Services Limited | Professional & scientific | 2025 |
| J and Z Holdings Ltd | Hospitality | 2024 |
| J Anderson’S Joinery Ltd | Construction | 2025 |
| J Avill Supplies Ltd | Wholesale & retail | 2025 |
| J B Burkinshaw & SON Limited | Wholesale & retail | 2025 |
| J B Hibberd Limited | Administrative & support | 2010 |
| J Ballantyne Construction Ltd | Construction | 2025 |
| J Barlow Ltd | Wholesale & retail | 2022 |
| J Beanes Accountancy Ltd | Professional & scientific | 2012 |
| J Birkby Consulting Limited | Professional & scientific | 2017 |
| J Blunden Fitness Ltd | Education | 2022 |
| J Blunden Personal Training Ltd | Arts & recreation | 2022 |
| J Brown Farming Limited | Transport & logistics | 2000 |
| J Buckley Joinery Limited | Manufacturing | 2021 |
| J Busen-Smith Ltd | Health & social care | 2014 |
| J C Muntus & Co Limited | Real estate | 2010 |
| J C Roofing & Cladding Limited | Construction | 2008 |
| J Cawthorne & SON Limited | Wholesale & retail | 2002 |
| J Clewes & Sons Electrical Limited | Construction | 2025 |
| J Coddington Limited | Wholesale & retail | 2004 |
| J Cole & Associates Ltd | Professional & scientific | 2025 |
| J Cowlings Ltd | Real estate | 2017 |
| J Crossland Consulting Ltd | Professional & scientific | 2024 |
| J D D Star Limited | Wholesale & retail | 2017 |
| J D Developments (Northern) Limited | Construction | 2011 |
| J D Vent Ltd | Manufacturing | 2014 |
| J F Smart Fitters Limited | Construction | 2023 |
| J Flynn Opticians Limited | Health & social care | 2005 |
| J G Birchall Ltd | Professional & scientific | 2026 |
| J G Pears (Holdings) Limited | Financial services | 1994 |
| J G Pears (Newark) Limited | Manufacturing | 2013 |
| J G Pears Commodities (South Africa) Limited | Wholesale & retail | 2020 |
| J G Pears Commodities Limited | Wholesale & retail | 2013 |
| J G Pears Machinery Limited | Administrative & support | 2013 |
| J G Pears Power (O&M) Limited | Manufacturing | 2016 |
| J G Pears Power Limited | Energy | 2016 |
| J G Pears Property Limited | Real estate | 2013 |
| J G Pears Rendering Limited | Manufacturing | 2013 |
| J G Rowe Limited | Real estate | 2010 |
| J Guest Property Ltd | Real estate | 2024 |