| Hy-Parts Limited | Extraterritorial | 2001 |
| Hybrid Performance Ltd | Wholesale & retail | 2016 |
| Hyder Bar Street Ltd | Real estate | 2023 |
| Hydro-Base Ltd | Other services | 2020 |
| Hydroponicsa Limited | Agriculture & fishing | 2024 |
| Hyrstmount Cleaning Ltd | Administrative & support | 2025 |
| I & a Essentials Ltd | Wholesale & retail | 2025 |
| I & I Ventures Ltd | Wholesale & retail | 2018 |
| I L Locum Ltd | Wholesale & retail | 2017 |
| I&R Developments Ltd | Construction | 2020 |
| I-Secure Services (ISS) Ltd | Information & communication | 2023 |
| I.H Diagnostics Limited | Health & social care | 2021 |
| IA Joinery Ltd | Construction | 2024 |
| IAK Holdings Ltd | Financial services | 2023 |
| IAP Fohen Ltd | Wholesale & retail | 2019 |
| IAP Holdings Ltd | Financial services | 2019 |
| IAP Propco Ltd | Real estate | 2021 |
| Ibhanabhai Ltd | Information & communication | 2023 |
| IBN Properties Ltd | Real estate | 2017 |
| IC Karz Ltd. | Administrative & support | 2009 |
| Icon Motorwerx Limited | Wholesale & retail | 2023 |
| Ideal 1ST Car Ltd | Wholesale & retail | 2024 |
| Ideal Homes & Properties Limited | Real estate | 2019 |
| IHH Logistics Limited | Transport & logistics | 2018 |
| IHK Ltd | Hospitality | 2020 |
| Ihya Holding Ltd | Financial services | 2026 |
| IIB Developments Limited | Construction | 2015 |
| IIB Properties Limited | Real estate | 2017 |
| IK Performance Motors Ltd | Wholesale & retail | 2024 |
| Illumitz Limited | Wholesale & retail | 2023 |
| Imaat Health Ltd | Wholesale & retail | 2023 |
| Imdadh Ltd | Administrative & support | 2010 |
| Imill Ltd | Wholesale & retail | 2021 |
| Imperio Enterprises Limited | Professional & scientific | 2020 |
| Importsuk Ltd | Wholesale & retail | 2020 |
| Impress (Holdings) Ltd | Administrative & support | 2010 |
| Impress Blinds Ltd | Wholesale & retail | 2014 |
| Impress Printers (UK) Limited | Manufacturing | 2000 |
| Improve Business Solutions Ltd | Administrative & support | 2016 |
| Inayat Property Investments Ltd | Construction | 2021 |
| Inc Dental Limited | Health & social care | 2025 |
| Independent Care Group | Health & social care | 2002 |
| Indulge (Batley) Ltd | Hospitality | 2019 |
| Indus SRM North Ltd | Manufacturing | 2024 |
| Infinity Advertising Ltd | Professional & scientific | 2024 |
| Infinity Fire and Security West Yorkshire Limited | Administrative & support | 2022 |
| Infinity MF Limited | Transport & logistics | 2020 |
| Ingeniarus Bellator Ltd | Professional & scientific | 2022 |
| Initial Consultants Limited | Administrative & support | 2015 |
| Inner Process Counselling & Training Services Ltd | Education | 2025 |
| Innosonix UK Limited | Wholesale & retail | 2025 |
| Innovation Beds Ltd | Manufacturing | 2023 |
| Innovations by YOU Limited | Construction | 2023 |
| Innovative Upholstery Ltd | Manufacturing | 2023 |
| Insite Innovation Ltd | Construction | 2021 |
| Inspect Properties Ltd | Real estate | 2021 |
| Instafix Interiors Ltd | Construction | 2015 |
| Integral Technical Solutions Ltd | Professional & scientific | 2019 |
| Integrated Diagnostic Partners Ltd | Health & social care | 2026 |
| Interico Ltd | Information & communication | 2022 |
| Interior-Displays Limited | Construction | 2008 |
| International Beds Ltd | Manufacturing | 2025 |
| International Sports Agency Ltd | Professional & scientific | 2020 |
| Ioan and Sons Limited | Construction | 2025 |
| Ironzone Holdings Limited | Wholesale & retail | 2025 |
| Ironzone Ltd | Wholesale & retail | 2024 |
| Isaa Properties Ltd | Real estate | 2020 |
| ISE Contractors Ltd | Construction | 2025 |
| Ishymenterprise Ltd | Wholesale & retail | 2025 |
| Iskandar Capital Limited | Administrative & support | 2018 |
| Ismail Al-Murad Ltd | Real estate | 2005 |
| Istrefi Construction Ltd | Construction | 2025 |
| Italian to English Translations Ltd | Professional & scientific | 2012 |
| ITM Resources Ltd | Financial services | 2011 |
| Itsaal Limited | Information & communication | 2020 |
| IVY Homes Limited | Real estate | 2013 |
| IYA Estates Ltd | Real estate | 2025 |
| IYA Property Investments Ltd | Real estate | 2026 |
| J & S York Ltd | Real estate | 2026 |
| J Oates Engineering Limited | Manufacturing | 2018 |
| J W Crowther Ltd | Construction | 2024 |
| J&H Beehive Limited | Wholesale & retail | 2023 |
| J&S Beds Group Ltd | Manufacturing | 2021 |
| J. Exley (Batley) Limited | Financial services | 2013 |
| J.M. Armitage Limited | Administrative & support | 1966 |
| J.T.& J. Taylor Limited | Manufacturing | 2019 |
| JA Holdings Group Ltd | Real estate | 2026 |
| Jack Rawson Haulage Limited | Transport & logistics | 2001 |
| Jacmor Limited | Transport & logistics | 2010 |
| Jade Windows (Brighouse) Limited | Manufacturing | 1995 |
| Jafarsons Ltd. | Real estate | 2024 |
| Jafhk Property Ltd | Real estate | 2022 |
| Jake's Films Limited | Information & communication | 2019 |
| Jamaalun Limited | Wholesale & retail | 2025 |
| James Alexander Safety Ltd | Wholesale & retail | 2022 |
| JAN London AGC Ltd | Wholesale & retail | 2025 |
| JAN Tijarat Limited | Wholesale & retail | 2025 |
| Janan Interiors Ltd | Manufacturing | 2025 |
| Jan’S Car Hire Ltd | Administrative & support | 2026 |
| Jayanu Limited | Wholesale & retail | 2021 |