| Health Forever Ltd | Other services | 2016 |
| Health Infinitum Ltd | Health & social care | 2025 |
| Health Innovations Holdings Ltd | Financial services | 2022 |
| Health One Innovation Ltd | Manufacturing | 2019 |
| Health Plus Living Ltd | Wholesale & retail | 2014 |
| Health Supplies Limited | Wholesale & retail | 2010 |
| Health Today Ltd | Real estate | 2003 |
| Health Wealth and Peace Ltd | Health & social care | 2025 |
| Health Wealth Lifestyle Limited | Arts & recreation | 2019 |
| Health Zone Limited | Wholesale & retail | 1997 |
| Healthbest Private Limited | Wholesale & retail | 2026 |
| Healthcare Films Limited | Extraterritorial | 2009 |
| Healthier Products Limited | Wholesale & retail | 2017 |
| Healthkoturk Limited | Health & social care | 2020 |
| Healthmar Ltd | Health & social care | 2022 |
| Healthme Meds Limited | Wholesale & retail | 2020 |
| Healthsense PCN Limited | Health & social care | 2020 |
| Healthspan Ltd | Health & social care | 2026 |
| Healthy Bakes Ltd | Wholesale & retail | 2023 |
| Heart of Joy Limited | Health & social care | 2025 |
| Heart of London Care Ltd | Administrative & support | 2025 |
| Hearthstone Care Services Limited | Health & social care | 2019 |
| Hearts Desire Ltd | Other services | 1998 |
| Heartwood House | Education | 2005 |
| Hearwise Ltd | Wholesale & retail | 2026 |
| Heathcoat Ltd | Real estate | 2023 |
| Heathcrest Limited | Real estate | 1987 |
| Heathdene (Weybridge) Residents Company Limited | Households | 2004 |
| Heathedene Limited | Real estate | 2014 |
| Heathfield Apartments Company Limited | Households | 2000 |
| Heathfield Convenience Store Ltd | Wholesale & retail | 2019 |
| Heathfield Grounds Maintenance Limited | Administrative & support | 2015 |
| Heathfield House Cambridge Limited | Real estate | 2018 |
| Heathland Properties Limited | Real estate | 2000 |
| Heathland Whitefriars Federation | Education | 2014 |
| Heathrow Auctions Limited | Wholesale & retail | 2021 |
| Heathway Industrial Estate Management Company Limited | Real estate | 1989 |
| Heating and Plumbing London Ltd | Construction | 2026 |
| Heatpumps Hub Limited | Construction | 2014 |
| Heavenly Crepes Limited | Wholesale & retail | 2019 |
| Heavenly Spices Ltd | Hospitality | 2025 |
| Heavy Duty Machineries Limited | Wholesale & retail | 2025 |
| Heavy Transporters Limited | Construction | 2022 |
| Hebimed Tech Solutions Ltd | Wholesale & retail | 2016 |
| Hebronne UK Limited | Professional & scientific | 2024 |
| Heclips Barbershop Limited | Other services | 2024 |
| Hector Developments Limited | Construction | 2014 |
| Hedgehog Investments Ltd | Construction | 2013 |
| Hedley Jones Limited | Administrative & support | 2014 |
| Heeba Software Associates Ltd | Information & communication | 2010 |
| Heer IT Limited | Information & communication | 2023 |
| Heer Ltd | Wholesale & retail | 2024 |
| Heeta Ltd | Wholesale & retail | 2021 |
| Hegons Group Ltd | Construction | 2021 |
| Heidi's B Ltd | Hospitality | 2025 |
| Heimm & Masun Limited | Information & communication | 2018 |
| Hekmat Accessories Limited | Wholesale & retail | 2017 |
| Helas Healthcare 2 Ltd | Wholesale & retail | 2026 |
| Heldenplatz Limited | Arts & recreation | 2013 |
| Helen Mcaleer Limited | Professional & scientific | 2016 |
| Helen's Study World Ltd | Education | 2025 |
| Helical M&E Ltd | Construction | 2024 |
| Helicopter Services Limited | Transport & logistics | 2003 |
| Helios Intellect Limited | Information & communication | 2026 |
| Heliosin Ltd | Construction | 2011 |
| Helius Recruitment Ltd | Administrative & support | 2026 |
| Helix NEB Limited | Professional & scientific | 2023 |
| Hella Keck Ltd | Professional & scientific | 2023 |
| Hellenic Food Distribution UK Ltd | Wholesale & retail | 2017 |
| Helmstone Consulting Ltd | Professional & scientific | 2016 |
| Help ME Clean Ltd | Administrative & support | 2021 |
| Help ME Grow Fostering Services Ltd | Health & social care | 2013 |
| Help ME Scrub Ltd | Administrative & support | 2021 |
| Help Press Limited | Manufacturing | 2000 |
| Helpur Limited | Administrative & support | 2014 |
| Hemalshah Ltd | Professional & scientific | 2024 |
| Hemel Apartments Ltd | Real estate | 2023 |
| Hemel Business Park Limited | Real estate | 2020 |
| Hemel Hempstead Assets Ltd | Real estate | 2014 |
| Hemel Trophies & Jewellers Limited | Administrative & support | 2006 |
| Hemingway Yachts Limited | Professional & scientific | 2014 |
| Hempstead Road Dental Care PVT Ltd | Health & social care | 2019 |
| Hemraaj Constructions Ltd | Construction | 2024 |
| Hems Construction Ltd | Construction | 2026 |
| Hemsley Miller (BDS) Limited | Professional & scientific | 2022 |
| Hemsley Miller Limited | Professional & scientific | 2003 |
| Hemswell Residents Company Limited | Households | 2000 |
| Henderson & Hendrix Limited | Real estate | 2024 |
| Henderson Bay Ltd | Professional & scientific | 2026 |
| Henderson Hub Company Limited | Arts & recreation | 2013 |
| Hendo Properties Ltd | Real estate | 2021 |
| Hendon Football Club (2008) Limited | Arts & recreation | 2008 |
| Hendon Glass Ltd | Construction | 2024 |
| Hendon Wood Lane Ltd | Real estate | 2026 |
| Hendon Woodwork Ltd | Manufacturing | 2026 |
| Henllys Enterprises Limited | Wholesale & retail | 2012 |
| Hennahues Ltd | Wholesale & retail | 2026 |
| Henry & Sons London Harrow Ltd | Wholesale & retail | 2015 |
| Henry Dony Associates Limited | Financial services | 2004 |
| Henzi Limited | Wholesale & retail | 2023 |