| Haymans Landscapes Limited | Administrative & support | 2024 |
| Haynes Investments Limited | Professional & scientific | 2014 |
| Hayward Estate Management Limited | Real estate | 2025 |
| Hazael Consulting Limited | Professional & scientific | 2016 |
| Hazael Martial Arts Tuition Ltd | Arts & recreation | 2026 |
| Hazelden & Sons Limited | Arts & recreation | 1958 |
| Hazelhatch Limited | Real estate | 2014 |
| Hazell Carr Limited | Administrative & support | 1997 |
| Hazipara Ltd | Wholesale & retail | 2024 |
| Hbbb Investments Ltd | Professional & scientific | 2017 |
| HBH Property Services Limited | Construction | 2018 |
| HBS Building and Waste Management Limited | Construction | 2014 |
| HC1X Ltd | Real estate | 2021 |
| Hcgl Group Ltd | Financial services | 2021 |
| HCJ Consultancy Services Limited | Information & communication | 2018 |
| HCL Private Capital Ltd | Financial services | 2026 |
| HCL Private Capital Propco Ltd | Real estate | 2026 |
| HCO Consulting Limited | Professional & scientific | 2014 |
| HCO Investments Limited | Extraterritorial | 2024 |
| HDA Management Group Ltd | Hospitality | 2019 |
| HDB MAX Ltd | Wholesale & retail | 2020 |
| He-Van Movers of the Universe Ltd | Transport & logistics | 2016 |
| Headers and Volleys Entertainment Ltd | Information & communication | 2023 |
| Headfirst Hair Salon Limited | Other services | 2003 |
| Healing Hygea Ltd | Health & social care | 2025 |
| Health Equity Insights Ltd | Professional & scientific | 2026 |
| Health Innovation Kent Surrey Sussex Ltd | Extraterritorial | 2023 |
| Health IS Wealth Food Supplements Ltd | Health & social care | 2022 |
| Healthcare Delivery Partners Limited | Professional & scientific | 2020 |
| Healthcare OTR Limited | Information & communication | 2005 |
| Healthcare Transformation Services Ltd | Professional & scientific | 2025 |
| Healthchoice Medisearch (UK) Limited | Financial services | 2006 |
| Healthvie Ltd. | Wholesale & retail | 2014 |
| Healthy Food Brands Limited | Manufacturing | 2006 |
| Healthy Gums Limited | Health & social care | 2013 |
| Healthy Sales Group Limited | Professional & scientific | 2000 |
| Heard Word Ltd | Professional & scientific | 2026 |
| Hearforyoucounsellingservice Ltd | Health & social care | 2025 |
| Hearn Geoserve Limited | Professional & scientific | 2013 |
| Heart Clinic Sussex Ltd | Health & social care | 2023 |
| Heart Publications Limited | Information & communication | 2006 |
| Heartfelt Associates Limited | Professional & scientific | 2018 |
| Heartily Limited | Information & communication | 2011 |
| Heasman Construction Limited | Construction | 1992 |
| Heatcast Ltd | Financial services | 2019 |
| Heather Court Limited | Households | 2001 |
| Heathland Holdings Limited | Real estate | 2018 |
| Heathland Hurstpierpoint Limited | Real estate | 2018 |
| Heathmoor Limited | Households | 1985 |
| Heatload Limited | Administrative & support | 2021 |
| Heaton Healthcare Limited | Health & social care | 2025 |
| Heavon Holdings Limited | Real estate | 1956 |
| Hebi Holdings Co. Ltd | Financial services | 2025 |
| Hedgeway International Limited | Professional & scientific | 2025 |
| Heene Community Association Ltd | Hospitality | 2024 |
| Heinrich Limited | Other services | 2014 |
| HEL4MECH Holdings Limited | Financial services | 2024 |
| Helen Puxley Furnishings Ltd | Manufacturing | 2023 |
| Helin Photography Limited | Professional & scientific | 2024 |
| Helios Management Limited | Professional & scientific | 2010 |
| Helix Contracts Limited | Professional & scientific | 1997 |
| Hello October Limited | Information & communication | 2016 |
| Hellon Limited | Other services | 2015 |
| Hellonova Ltd | Information & communication | 2022 |
| Help ME Pest Control Ltd | Administrative & support | 2022 |
| Helpful Magpie Ltd | Professional & scientific | 2023 |
| Hema Management Ltd | Information & communication | 2018 |
| Hemingway Wills Ltd | Professional & scientific | 2025 |
| Hengoed Limited | Real estate | 2009 |
| Henley and Hyde Limited | Manufacturing | 2022 |
| Henry Gresham Ltd | Extraterritorial | 2016 |
| Henry House Therapy Centre Ltd | Health & social care | 2010 |
| Henry James Trading Limited | Wholesale & retail | 2012 |
| Henry Morgan Driver Services Ltd | Transport & logistics | 2026 |
| Henry Nicholls & SON Antiques Ltd | Wholesale & retail | 2011 |
| Hensby Law Ltd | Professional & scientific | 2010 |
| Heptinstalls JWP Ltd | Wholesale & retail | 2023 |
| Heraldstone Limited | Wholesale & retail | 2000 |
| Here 4 Heat Ltd | Construction | 2013 |
| Heritage Build Sussex Ltd | Construction | 2025 |
| Heritage Building Group Limited | Construction | 2026 |
| Heritage Hardware Limited | Wholesale & retail | 2025 |
| Heritage International Transport Limited | Transport & logistics | 1996 |
| Heritage Remediation Limited | Construction | 2019 |
| Heritage Square Limited | Financial services | 2013 |
| Hermanos Colombian Coffee Roasters Ltd | Hospitality | 2016 |
| Herne-Chase Limited | Real estate | 1958 |
| Herrliberg Consulting Limited | Professional & scientific | 2019 |
| Hesketh Estates,Limited | Real estate | 1927 |
| HEY JOE Limited | Professional & scientific | 2011 |
| HEY Judes Holdings Limited | Financial services | 2019 |
| HEY Pluto Limited | Information & communication | 2022 |
| HEY Wave Digital Ltd | Wholesale & retail | 2026 |
| HF Resourcing Limited | Administrative & support | 2026 |
| HFH Investments Limited | Construction | 2020 |
| HG Hair Company Limited | Other services | 2021 |
| HH Alexander Ltd | Real estate | 2019 |
| HH Gaming Limited | Information & communication | 2020 |
| HH Gaming Web Services Ltd | Administrative & support | 2020 |
| Hibe Limited | Real estate | 2001 |