| Hayne Barn Investments Limited | Real estate | 2000 |
| Hayne Barn Leisure Limited | Other services | 2007 |
| HBS Europe Beheer Limited | Other services | 2025 |
| HBS Europe Limited | Other services | 2025 |
| Health First Solutions Limited | Health & social care | 2016 |
| Heat QI Ltd. | Professional & scientific | 2009 |
| Heat Supliers Beheer Limited | Other services | 2025 |
| Heat Supliers Limited | Other services | 2025 |
| Helen & Richard Limited | Real estate | 2015 |
| Henlion House (Management) Limited | Households | 1979 |
| Henry's Wine Bar & Cafe Limited | Hospitality | 2026 |
| Henwood Twenty Two Limited | Professional & scientific | 2015 |
| Heritage Homes and Drives Ltd | Construction | 2015 |
| Herwin Associates Limited | Professional & scientific | 2007 |
| Heyver Global Brand IBC Limited | Other services | 2021 |
| Hickman S G Limited | Other services | 2015 |
| Hickman-Jones Architecture Ltd | Professional & scientific | 2022 |
| High Grange (Hythe) Limited | Real estate | 2020 |
| Highspeedpartnership Ltd | Professional & scientific | 2022 |
| Hill Elevation Ltd | Professional & scientific | 2026 |
| Hills and Holland Ltd | Hospitality | 2023 |
| Hillside Court (Hythe) Residents Company Limited | Households | 1998 |
| Hillstone Court (Dover) Flat Management Company Limited | Households | 1999 |
| Hillux Beheer Limited | Other services | 2025 |
| Hillux Limited | Other services | 2025 |
| HJA Advisory Ltd | Professional & scientific | 2022 |
| HJC Ostrea Beheer Limited | Other services | 2025 |
| HJC Ostrea Limited | Other services | 2025 |
| HNL Consulting Limited | Other services | 2013 |
| Hogs Green Equestrian Limited | Agriculture & fishing | 2014 |
| Holiday Extras Acquisitions Limited | Other services | 2017 |
| Holiday Extras Cover Limited | Financial services | 2004 |
| Holiday Extras Investments Limited | Other services | 2011 |
| Holiday Extras Limited | Other services | 1983 |
| Holiday Extras Properties Limited | Real estate | 2005 |
| Holiday Extras Transport Limited | Other services | 2002 |
| Holidays by Kate Ltd | Administrative & support | 2025 |
| Holland Trusted Associates Limited | Other services | 2025 |
| Hollandse Beheer Maatschappij Limited | Professional & scientific | 2015 |
| Holly Close & Mulberry Court Management Co. Limited | Households | 1997 |
| Home Intermodal Transport UK Ltd | Transport & logistics | 2019 |
| HOP Fuzz Ltd | Manufacturing | 2011 |
| HOP Skip and Flutter Ltd | Wholesale & retail | 2024 |
| Hope Church Colchester | Other services | 2013 |
| Horus Impire Structure Limited | Other services | 2025 |
| Hotgreyhair Limited | Arts & recreation | 2009 |
| Housden Holdings Limited | Information & communication | 2023 |
| House of Praise Group Ltd | Information & communication | 2026 |
| HRH Consultancy Ltd | Professional & scientific | 2003 |
| Hyacinthville Limited | Professional & scientific | 2011 |
| Hybrid Agronomy Ltd | Agriculture & fishing | 2022 |
| Hythe & Seek Travel Ltd | Administrative & support | 2025 |
| Hythe Bay Bar and Grill Limited | Hospitality | 2020 |
| Hythe Bay Financial Ltd | Financial services | 2012 |
| Hythe Care Homes Limited | Health & social care | 2011 |
| Hythe Catering Ltd | Hospitality | 2026 |
| Hythe Club Company Limited(The) | Professional & scientific | 1914 |
| Hythe Couriers Ltd | Transport & logistics | 2020 |
| Hythe Coworking Hub Ltd | Real estate | 2022 |
| Hythe Eatery Ltd | Hospitality | 2026 |
| Hythe Electrical Limited | Construction | 2013 |
| Hythe Football Club CIC | Arts & recreation | 2026 |
| Hythe Golf Club Limited | Arts & recreation | 2014 |
| Hythe Hair Studio Ltd | Other services | 2023 |
| Hythe Homes Ltd | Real estate | 2025 |
| Hythe House Holdings Ltd | Real estate | 2026 |
| Hythe Kent Bookkeeping Services Limited | Professional & scientific | 2019 |
| Hythe Life Magazine Community Interest Company | Information & communication | 2014 |
| Hythe Lotus Limited | Other services | 2024 |
| Hythe Management Ltd | Real estate | 2021 |
| Hythe Properties Kent Ltd | Real estate | 2026 |
| Hythe Security Services Limited | Administrative & support | 2020 |
| Hythe Town Football Club | Arts & recreation | 1995 |
| Hythe Town Football Club PTY Ltd | Arts & recreation | 2025 |
| Hythe Venetian Fete Society Limited | Arts & recreation | 1983 |
| IEX IBC Limited | Other services | 2024 |
| IHS Transport Limited | Other services | 2024 |
| Ijsblokjes Online Limited | Other services | 2025 |
| IL Platina Limited | Hospitality | 2012 |
| Ilsa Clark Limited | Health & social care | 2022 |
| Imperial Express Limited | Extraterritorial | 2026 |
| Imperial FM Limited | Extraterritorial | 2026 |
| Imperial Green KEW RTM Company Limited | Real estate | 2010 |
| Imperial Transfer Ltd | Transport & logistics | 2024 |
| Indian Smart Eatery Limited | Hospitality | 2025 |
| Indiscriminate Food Company Ltd | Hospitality | 2025 |
| Industreum Holding Limited | Other services | 2021 |
| Industrial Procurement Solutions Limited | Wholesale & retail | 2015 |
| Innovalab Holdings Limited | Financial services | 2024 |
| Insahyt Ltd | Education | 2020 |
| Inspired Smart Living Ltd | Construction | 2019 |
| Integrum Care Limited | Administrative & support | 2018 |
| Integrum Group Holdings Limited | Professional & scientific | 2024 |
| Intelligent Railway Infrastructure Services Ltd | Construction | 2014 |
| Inter-Continental Autolease Limited | Wholesale & retail | 2000 |
| International Special Sky Works Limited | Other services | 2025 |
| International Special Sky Works Netherlands Limited | Other services | 2025 |
| Investor Connect Marketing Limited | Professional & scientific | 2018 |
| Invictus IBC Limited | Other services | 2024 |
| IOH the Lounge Ltd | Hospitality | 2025 |