| Home Matters Loans Limited | Financial services | 2020 |
| Homevista Estates Limited | Real estate | 2025 |
| Homewise Property Management Company Limited | Real estate | 2023 |
| Hook and Cleaver Wholesale Limited | Wholesale & retail | 2023 |
| Hope Community Church Swanley | Other services | 2004 |
| Hospitality Hunters Ltd | Administrative & support | 2017 |
| Housden Haulage Limited | Transport & logistics | 2011 |
| Hover Film Limited | Professional & scientific | 2022 |
| HOW Scaffolding Ltd | Construction | 2012 |
| HSO Contracts Ltd | Construction | 2024 |
| Hub Works Ltd. | Professional & scientific | 2016 |
| Hudson Haulage Limited | Transport & logistics | 2003 |
| Hughes Haulage Limited | Transport & logistics | 2005 |
| Hulls Recovery Limited | Wholesale & retail | 2018 |
| Human Capital Solutions Limited | Financial services | 2018 |
| Humcap Recruitment Limited | Administrative & support | 2018 |
| Humphrey Homes Ltd | Real estate | 2018 |
| Huro Data Technologies Ltd. | Information & communication | 2000 |
| Hustle Estates Ltd | Real estate | 2025 |
| HWM Properties Limited | Real estate | 2020 |
| HWM Solutions Ltd | Construction | 2016 |
| Hylands Roofing Ltd | Construction | 2023 |
| Hyper-Personal Limited | Administrative & support | 2023 |
| Hyrup Limited | Professional & scientific | 2012 |
| I Dwell Properties LLP | | 2018 |
| I P Network Cabling Limited | Information & communication | 2012 |
| Ibba Home Ltd | Manufacturing | 2020 |
| IEU Ltd | Real estate | 2026 |
| IGP Carpentry Limited | Construction | 2012 |
| Ilexius Ltd | Information & communication | 2020 |
| Image Group Ltd | Manufacturing | 2009 |
| Imagine Schools Limited | Professional & scientific | 2008 |
| Imentoruk Ltd. | Education | 2015 |
| Imperial Equestrian Ltd | Wholesale & retail | 2018 |
| Impression Care Limited | Health & social care | 2015 |
| IN AWE & Wonder Ltd | Health & social care | 2025 |
| IN Your Element Events Limited | Administrative & support | 2018 |
| Indian Spice (BD) Ltd | Extraterritorial | 2018 |
| Industrial Security Doors Limited | Manufacturing | 1995 |
| Infinityvantage Limited | Information & communication | 2023 |
| Infragral Limited | Professional & scientific | 2020 |
| Ingham Building Services Limited | Construction | 2009 |
| Inglewood RTM Company Limited | Households | 2018 |
| Inlustris Associates Ltd | Professional & scientific | 2026 |
| Innisfree Schools (F2C) Limited | Financial services | 2013 |
| Innisfree Schools (Secondary) Limited | Financial services | 2013 |
| Innovations Commerce Limited | Wholesale & retail | 2020 |
| Innovis Solutions Limited | Information & communication | 2009 |
| Inspire AOT Limited | Health & social care | 2025 |
| Inspire Care Providers Ltd | Health & social care | 2025 |
| Inspired Installations Ltd | Construction | 2020 |
| INTEGRATION360 Limited | Information & communication | 2009 |
| Integrum Consulting Limited | Professional & scientific | 2010 |
| Interior Talents Limited | Administrative & support | 2022 |
| Interventure Capital Limited | Financial services | 2020 |
| Intuit Digital Limited | Information & communication | 2021 |
| Investissement Property Limited | Real estate | 2014 |
| Invicta Property Surveyors Ltd | Professional & scientific | 2025 |
| Invicta Pubs Limited | Hospitality | 2003 |
| Invictus First AID Training Limited | Health & social care | 2014 |
| IPC Building Ltd | Construction | 2022 |
| Ironclad Industries Limited | Real estate | 2024 |
| ISG Commercial Holdings Limited | Professional & scientific | 2020 |
| ISG Commercial Limited | Administrative & support | 2017 |
| ISG Security Limited | Professional & scientific | 2019 |
| Istead Investments Limited | Financial services | 2024 |
| IT Sols and Services Limited | Information & communication | 2018 |
| Izosc Trading Ltd | Wholesale & retail | 2024 |
| J & G Ceilings Limited | Construction | 2013 |
| J and L Property Maintenance Ltd | Construction | 2025 |
| J Mccaul Lift & Haul Ltd | Transport & logistics | 2023 |
| J PEC Carpentry & Lofts Limited | Construction | 2022 |
| J Roofing Ltd | Construction | 2024 |
| J S News Agent Limited | Wholesale & retail | 2015 |
| J&Chomeworks Ltd | Construction | 2025 |
| J&T Bespoke Limited | Manufacturing | 2018 |
| J. Coker Limited | Manufacturing | 1991 |
| J. P. M. Scaffolding Limited | Construction | 2006 |
| J.A. Dental Care Ltd | Health & social care | 2019 |
| J.R. Executive Recruitment Ltd | Administrative & support | 2022 |
| JA Property Portfolio Ltd | Real estate | 2021 |
| JAG Meica Limited | Construction | 2025 |
| Jahangir Alam Real Estate Ltd | Real estate | 2026 |
| Jake Brewer Ltd | Other services | 2022 |
| JAM Worldwide Limited | Manufacturing | 2016 |
| Jambakescakes Ltd | Manufacturing | 2025 |
| JAME3 Enterprises Ltd | Real estate | 2023 |
| James & J Consultancy Ltd | Professional & scientific | 2019 |
| James and Lester Property Management Ltd | Real estate | 2022 |
| James Blackburn Limited | Information & communication | 2012 |
| James Moore Sales Limited | Professional & scientific | 2025 |
| James Stewart Productions Limited | Information & communication | 2018 |
| Jbsco Limited | Real estate | 2023 |
| JCL Projects Limited | Construction | 2011 |
| JDB Solution Sales Ltd | Professional & scientific | 2022 |
| JDY Property Limited | Real estate | 2022 |
| Jeanprof Limited | Health & social care | 2015 |
| Jeap Clothing & Promotions Ltd | Manufacturing | 2018 |
| JEB Group Limited | Financial services | 2023 |
| Jeff Construction Consults Ltd | Construction | 2018 |