| Hazelind Consultants Limited | Professional & scientific | 2014 |
| HBC (Agency) Ltd | Professional & scientific | 2012 |
| HD Carpentry & Building Ltd | Construction | 2013 |
| Headstart Care Limited | Extraterritorial | 2023 |
| Headstart Educational Adolescent Services Limited | Education | 1999 |
| Headstart Residential Care Ltd | Health & social care | 2016 |
| HEADSTART2WORK | Education | 2008 |
| Health Management Services Limited | Health & social care | 2016 |
| Health-Style for Life Limited | Health & social care | 2016 |
| Heath's Barbershop Limited | Other services | 2026 |
| Heathercrest Enterprises Limited | Real estate | 1999 |
| Heathfield Agricultural Show | Administrative & support | 2021 |
| Heavy Horse Pictures Ltd | Information & communication | 2014 |
| Hedges Driveways Limited | Construction | 2006 |
| Heir Properties Ltd | Real estate | 2025 |
| Helen Cottington Limited | Professional & scientific | 2025 |
| Helionix Developments Limited | Agriculture & fishing | 1979 |
| Helionix Group Limited | Professional & scientific | 1994 |
| Hello Safety Limited | Administrative & support | 2015 |
| Helme Properties Limited | Real estate | 1957 |
| Helo Works Ltd | Professional & scientific | 2021 |
| Helpful HR Limited | Professional & scientific | 2017 |
| Hemsley Property Services Limited | Other services | 2025 |
| Heritage Tonewoods Ltd | Manufacturing | 2026 |
| Heritage Trail Series Limited | Arts & recreation | 2023 |
| Hermitage Garage Limited | Wholesale & retail | 2002 |
| Herrtom Limited | Wholesale & retail | 2010 |
| Herstmonceux Castle Estate Limited | Arts & recreation | 1994 |
| HES Residential Limited | Real estate | 2010 |
| Hestal Holdings Limited | Other services | 2015 |
| Highview Portfolio Ltd | Real estate | 2025 |
| Highwoods Golf Shop Limited | Wholesale & retail | 2003 |
| Hilder Knight Management Limited | Households | 2017 |
| Hilder Knight Properties Limited | Real estate | 2015 |
| Hillebron Consulting Limited | Professional & scientific | 2021 |
| Hiller Holdings Limited | Financial services | 2025 |
| Hiller Properties Ltd | Real estate | 2024 |
| Hinkypunk Brewery Limited | Manufacturing | 2025 |
| Hiplaas Medical Limited | Manufacturing | 2024 |
| Historic Roofing Ltd | Construction | 2024 |
| HJH Property Investments Ltd | Real estate | 2026 |
| HKC Holdings Limited | Financial services | 2019 |
| Hlshm Ltd | Other services | 2023 |
| HM Construction (Southern) Limited | Construction | 2018 |
| Holbeck & Lewis (Holdings) Limited | Financial services | 2008 |
| Holbeck & Lewis (Queens Cliff) Limited | Construction | 2004 |
| Holbeck Properties (Sussex) Ltd | Real estate | 2017 |
| Holbox Pacifico Ltd | Administrative & support | 2021 |
| Holdaway Holdings Ltd | Financial services | 2016 |
| Hollies Surgery Limited | Health & social care | 2023 |
| Hollow Inns Limited | Hospitality | 2009 |
| Holly Holdings Limited | Financial services | 2016 |
| Holms Oak Limited | Manufacturing | 2024 |
| Holston Holdings Limited | Financial services | 2019 |
| Holtbsl Limited | Professional & scientific | 2022 |
| Holtractors Limited | Administrative & support | 1986 |
| Holtrad Limited | Health & social care | 2013 |
| Holywell Tea Chalet Limited | Hospitality | 2011 |
| Home From Home Meals (South East) Limited | Hospitality | 2023 |
| Home Interiors Group Ltd | Other services | 2019 |
| Homes by Dominika Limited | Real estate | 2024 |
| Homesteed Properties Limited | Real estate | 2021 |
| Homestyle Franchise Limited | Administrative & support | 2019 |
| Honeycrag Management Company Limited | Households | 1990 |
| Honeysuckles Design Ltd | Professional & scientific | 2026 |
| Horam Park Limited | Arts & recreation | 2005 |
| Horizonrise Ltd | Wholesale & retail | 2025 |
| Horsebridge Veterinary Practice Limited | Professional & scientific | 2011 |
| Hot Box Sauna and Ice Baths Ltd | Arts & recreation | 2025 |
| Howard House Residents (Eastbourne) Limited | Households | 1990 |
| HPW Electrical Limited | Construction | 2022 |
| Hrcc Group Limited | Financial services | 2025 |
| Hrcc Holdings Ltd | Financial services | 2015 |
| HRW Advisory Limited | Professional & scientific | 2006 |
| HS Events Limited | Hospitality | 2025 |
| HS Snacks Ltd | Hospitality | 2025 |
| Hs-Hire Limited | Wholesale & retail | 2019 |
| HSM Property Holdings Limited | Real estate | 2026 |
| HSS Holdings Limited | Real estate | 2015 |
| Hugo Developments & Construction Limited | Manufacturing | 2026 |
| Human Events Limited | Financial services | 2023 |
| Human Network Limited | Financial services | 2023 |
| Human Travel Limited | Financial services | 2024 |
| Humber Orthopaedic Partnership LLP | | 2025 |
| Hunnibuns Limited | Wholesale & retail | 2022 |
| HVL Group Ltd | Transport & logistics | 2019 |
| HYB Luxury Marketing Ltd | Professional & scientific | 2025 |
| Hyde House (Eastbourne) Ltd | Households | 2002 |
| Hydroground Civils Limited | Professional & scientific | 2024 |
| Hypha London Limited | Professional & scientific | 2024 |
| I Compare 4 U Ltd | Professional & scientific | 2021 |
| I Hate Antiques Ltd | Wholesale & retail | 2026 |
| I M Building Services (Sussex) Ltd | Construction | 2022 |
| Iacss Ltd | Transport & logistics | 2025 |
| Iain Carter Limited | Financial services | 2021 |
| IAN Goswell Automotive Limited | Professional & scientific | 2017 |
| ICT Network Solutions Limited | Information & communication | 2015 |
| Ideal Work Innovative Surfaces Limited | Wholesale & retail | 2012 |
| Identity Global Events Limited | Extraterritorial | 2025 |
| Identity Global Group Limited | Extraterritorial | 2025 |