| Heritage Thoroughbreds Ltd | Agriculture & fishing | 2022 |
| Hermitage Capital Group Ltd | Financial services | 2026 |
| Heroicos Ltd | Professional & scientific | 2015 |
| Heys Property Rentals Limited | Real estate | 2019 |
| Heywooddeferrer Associates Limited | Education | 2019 |
| Hi-Lite Roof and Gutter Maintenance Ltd | Administrative & support | 2022 |
| Hicklin Spirits Ltd | Other services | 2024 |
| Hidden Pixel Graphics Limited | Arts & recreation | 2014 |
| High Technology Limited | Wholesale & retail | 2025 |
| Hightrees Organisation Limited | Information & communication | 2000 |
| Hilldrop Shoot Limited | Arts & recreation | 2011 |
| Hillwood Bloodstock Limited | Agriculture & fishing | 2009 |
| Hilo Exterior Cleaning Ltd | Administrative & support | 2017 |
| Hippodam Limited | Manufacturing | 2021 |
| Historic Arms Investments Limited | Wholesale & retail | 2014 |
| Hocking Trading Ltd | Wholesale & retail | 2026 |
| Holistic Health Farm Ltd | Health & social care | 2022 |
| Holly Berry Songwriter Ltd | Arts & recreation | 2018 |
| Home Farm (Minal) Limited | Agriculture & fishing | 1995 |
| Homer Farming Ltd | Agriculture & fishing | 2016 |
| Hook South Management Services Limited | Real estate | 2015 |
| Hooke and Marshall Ltd | Professional & scientific | 2020 |
| Horton's Books Limited | Wholesale & retail | 2010 |
| Hosier Brothers Limited | Agriculture & fishing | 1985 |
| House of POM Poms Ltd | Wholesale & retail | 2021 |
| Howard Royce Taylor Ltd | Health & social care | 2013 |
| Howdu Ltd | Professional & scientific | 2013 |
| Hqdb Ltd | Construction | 2018 |
| Huggins Roofing and Building Limited | Construction | 2008 |
| Huish Advisory Limited | Professional & scientific | 2014 |
| Humphrey's Ltd | Wholesale & retail | 2025 |
| Huntsworth Capital Ltd | Professional & scientific | 2020 |
| Hush Commercial Ltd | Construction | 2024 |
| Hush Land & Property Ltd | Real estate | 2024 |
| I J M Yates Farming Limited | Agriculture & fishing | 2017 |
| I O Components Limited | Financial services | 1998 |
| I:Seven Management Company Limited | Households | 2008 |
| Iarudi Consulting UK Limited | Financial services | 2014 |
| Ibex Software Limited | Information & communication | 2026 |
| Iceberg Pools Ltd | Construction | 2023 |
| Icequick Ltd | Information & communication | 2015 |
| Idyllic Holiday Properties Limited | Real estate | 2003 |
| IL Mulino Bakery Limited | Wholesale & retail | 2013 |
| Illume Scented Candles Limited | Wholesale & retail | 2012 |
| Image Cinemas Limited | Information & communication | 2017 |
| Imolott Hotel Group Ltd | Financial services | 2026 |
| Imolott Limited | Hospitality | 2014 |
| Improving Access Limited | Professional & scientific | 2013 |
| Independent Legal Services Limited | Other services | 1996 |
| Independent Legal Storage Limited | Professional & scientific | 2004 |
| Inglis Support Engineering Services Limited | Professional & scientific | 2010 |
| Innovative Analytic Solutions Limited | Administrative & support | 2014 |
| Inprospect Limited | Manufacturing | 2012 |
| Integra Support Partners Ltd. | Professional & scientific | 2015 |
| Intellagen Limited | Information & communication | 2006 |
| Intuit Reward Limited | Administrative & support | 2021 |
| Invenire Design Limited | Construction | 2017 |
| Invest in YOU Coaching Ltd | Education | 2023 |
| IOT Advisory Ltd | Administrative & support | 2017 |
| Iota Electronics Limited | Manufacturing | 2006 |
| IPR Financial Limited | Professional & scientific | 2012 |
| Iron Haven Ltd | Wholesale & retail | 2023 |
| Isebrook Consulting Limited | Professional & scientific | 2021 |
| Isms Matters Limited | Professional & scientific | 2014 |
| ITB Consulting Ltd | Information & communication | 2022 |
| Ivor Gordon Property Ltd | Real estate | 2023 |
| Iwire Limited | Information & communication | 2003 |
| J & C Voyageurs Limited | Administrative & support | 1988 |
| J Anderson Wealth Management Limited | Financial services | 2022 |
| J Bates & SON Ltd | Construction | 2005 |
| J Bond Nominees Ltd | Professional & scientific | 2012 |
| J E Jones Limited | Real estate | 2022 |
| J J C Media Limited | Information & communication | 2012 |
| J J Storage Systems Ltd | Construction | 2010 |
| J L G Catering Ltd | Hospitality | 2019 |
| J Rolls Construction Limited | Extraterritorial | 2018 |
| J.F.R Homes Limited | Real estate | 2021 |
| Jacarta Limited | Information & communication | 1997 |
| Janco Consultancy Limited | Professional & scientific | 2025 |
| Jarroms Management Services Limited | Real estate | 1984 |
| JAX Limited | Wholesale & retail | 2014 |
| JC Cooper Property Investments Ltd | Real estate | 2025 |
| Jephson Services Ltd | Construction | 2019 |
| Jephsonmullins Limited | Wholesale & retail | 2013 |
| Jess Weeks Interiors Limited | Professional & scientific | 2017 |
| Jessica James Properties Ltd | Real estate | 2022 |
| Jeudwine Ltd | Professional & scientific | 2026 |
| Jimdor Limited | Administrative & support | 2024 |
| JJ Pharma Consulting Ltd | Professional & scientific | 2021 |
| JL Howard Fieldsports Ltd | Arts & recreation | 2024 |
| Jmconnect Limited | Professional & scientific | 2011 |
| John F. Williams & Co. Limited | Professional & scientific | 2003 |
| Joint Venture Today Limited | Information & communication | 2012 |
| Josh F N Co Limited | Construction | 2025 |
| Joshua Hosier and SON Limited | Agriculture & fishing | 1963 |
| JP IT Solutions Ltd | Information & communication | 2013 |
| JRW Sales & Transport Logistics Ltd | Transport & logistics | 2025 |
| Julia Blunt Interiors Limited | Manufacturing | 1981 |
| Julie Deller Limited | Professional & scientific | 2019 |
| Juno Britain Ltd | Manufacturing | 2019 |