| Howell Legacy Holdings Limited | Professional & scientific | 2026 |
| Howsafeismymoney Limited | Other services | 2022 |
| HR Protocol Ltd | Administrative & support | 2013 |
| HR Refresh Limited | Administrative & support | 2025 |
| HR West Ltd | Manufacturing | 2025 |
| HRH Business Services Ltd | Professional & scientific | 2024 |
| Hssp Architects Limited | Professional & scientific | 2007 |
| HTP365 Ltd | Administrative & support | 2026 |
| Hubbard Group (Midlands) Limited | Financial services | 2022 |
| Hughes Gaming Group Ltd | Financial services | 2024 |
| Hughes Town Planning Consultancy Limited | Professional & scientific | 2019 |
| Humphrey Property Group Ltd | Construction | 2026 |
| Hunt and Swain Limited | Wholesale & retail | 2003 |
| Huskaloo Limited | Extraterritorial | 2022 |
| Hutch IT Ltd | Information & communication | 2026 |
| HZ Investments Limited | Real estate | 2016 |
| I F Hawley LLP | | 2014 |
| Iain Wetherill Associates Limited | Professional & scientific | 2020 |
| IAN Moulds Production Services Limited | Real estate | 2009 |
| Ibex Management Limited | Professional & scientific | 1998 |
| IC Tape Ltd | Construction | 2023 |
| Ice Software Limited | Information & communication | 2023 |
| Icon Music Limited | Wholesale & retail | 2012 |
| Icuro Ltd | Information & communication | 2015 |
| Icuro Property Ltd | Real estate | 2020 |
| Ideastream Limited | Professional & scientific | 2026 |
| Iferg Limited | Real estate | 2016 |
| Iksetech Limited | Administrative & support | 2005 |
| Imouto Ltd | Wholesale & retail | 2018 |
| Imovefreely Ltd | Other services | 2022 |
| Imperial Groundworks Limited | Construction | 2004 |
| IN Good Faith Tattoos Limited | Arts & recreation | 2025 |
| Indianhead Limited | Wholesale & retail | 2012 |
| Induserve Limited | Extraterritorial | 2016 |
| Infinity Aviation Limited | Transport & logistics | 2011 |
| Infrasun Ltd | Professional & scientific | 2000 |
| Inicio Learning Ltd | Financial services | 2023 |
| Inicio NOW Limited | Real estate | 2023 |
| Inner Power Counselling Ltd | Health & social care | 2022 |
| Innoveon Ltd | Professional & scientific | 2012 |
| Inntabiz Limited | Public administration | 2008 |
| Inspire Event Hire Ltd | Administrative & support | 2002 |
| Insulated Container Sales Limited | Manufacturing | 2020 |
| Insulated Unit Sales Limited | Manufacturing | 2020 |
| Intellectual Pursuit Limited | Information & communication | 2013 |
| Intellicate Limited | Information & communication | 1992 |
| Interim Food Manufacturing Services Ltd | Professional & scientific | 2023 |
| Interleaf Consulting Ltd | Professional & scientific | 2013 |
| International Network for the Study of Spirituality | Education | 2011 |
| International Platforms (VA) Limited | Wholesale & retail | 2021 |
| Interpump (U.K.) Limited | Professional & scientific | 1987 |
| Into the Woods Forest School Ltd | Education | 2022 |
| Invest 4 Limited | Real estate | 2017 |
| Invictus Engineering Group Ltd | Wholesale & retail | 2023 |
| Ipackaging Expertise Ltd | Administrative & support | 2017 |
| Irepairsguys Ltd | Other services | 2015 |
| Iris Place Management Company Limited | Real estate | 2018 |
| Iris Produce Limited | Agriculture & fishing | 2022 |
| Irobin Systems Ltd | Information & communication | 2025 |
| Iron Oaks Country Apparel Ltd | Wholesale & retail | 2026 |
| Ironbush Dairy Farm Limited | Agriculture & fishing | 2019 |
| Ironstone Mill Ltd | Hospitality | 2026 |
| Ishop 2026 Ltd | Wholesale & retail | 2026 |
| Istanbul Turkish Cuisine Limited | Hospitality | 2023 |
| Ivory Property Limited | Real estate | 2024 |
| J & J H Properties Ltd | Real estate | 2021 |
| J & L Hathaway Property Limited | Administrative & support | 2021 |
| J & L Sysonby Holdings Limited | Wholesale & retail | 2016 |
| J & M Fabrications Ltd | Manufacturing | 2004 |
| J & M Wealth Limited | Financial services | 2025 |
| J & S Turbayne Limited | Administrative & support | 2025 |
| J Adams Properties Ltd | Real estate | 2026 |
| J C Fabrication & Welding Ltd | Construction | 2016 |
| J C Properties & Holiday Lets Limited | Hospitality | 2016 |
| J H Blackburn and SON LLP | | 2021 |
| J H Duffin & Sons (Contractors) Limited | Agriculture & fishing | 2007 |
| J J Joinery Ltd | Construction | 2002 |
| J L Decorating Ltd | Construction | 2022 |
| J M Vehicle Services Ltd | Wholesale & retail | 2020 |
| J S Computer Solutions Ltd. | Information & communication | 1997 |
| J W Hazlewood & SON Ltd | Other services | 2021 |
| J&H Aesthetics Ltd | Health & social care | 2023 |
| J. Darlington & SON Limited | Agriculture & fishing | 1977 |
| J.F. Greaves & Sons (Farmers) Limited | Agriculture & fishing | 1970 |
| J.R.M Alloys Ltd | Manufacturing | 2014 |
| J.Woodhall Financial Services Ltd. | Financial services | 2014 |
| J3 Partnership Limited | Professional & scientific | 2006 |
| J3 Ventures Ltd | Hospitality | 2014 |
| Jabbahut Ltd | Manufacturing | 2014 |
| Jace Consulting Ltd. | Real estate | 2002 |
| Jack Turner Ltd | Real estate | 2013 |
| Jackdaw Express Ltd | Wholesale & retail | 2012 |
| Jackzero Limited | Construction | 2015 |
| Jagos Investments Limited | Real estate | 2015 |
| James Agger Autosport Ltd | Wholesale & retail | 2002 |
| James Alder Architects Limited | Professional & scientific | 2021 |
| JAP Retro Classics Ltd | Wholesale & retail | 2019 |
| Jarvis Management Consultant Limited | Professional & scientific | 2014 |
| Jarvis Property Development Group Ltd | Real estate | 2024 |
| Jasmine House Chinese Restaurant Limited | Hospitality | 2016 |