| Health and Vitality Solutions Limited | Health & social care | 2017 |
| Health and Wellbeing Trust Limited | Health & social care | 2007 |
| Health Catalyst UK Ltd | Information & communication | 2017 |
| Health DC Online Ltd | Education | 2025 |
| Health Edge Consumables Limited | Health & social care | 2006 |
| Health Edge International Limited | Extraterritorial | 2017 |
| Health Edge Solutions Limited | Health & social care | 1996 |
| Health Edge South East Limited | Extraterritorial | 2017 |
| Health Management (Uclh) Holdings Limited | Professional & scientific | 1999 |
| Health Management (Uclh) Limited | Health & social care | 1999 |
| Health Parcs Ltd | Extraterritorial | 2019 |
| Healthcare Financial Management Association | Other services | 2006 |
| Healthcare Ingredients Ltd | Administrative & support | 2015 |
| Healthcare Innovation Management Ltd | Other services | 2023 |
| Healthcare Planning Academy Limited | Other services | 2019 |
| Healthcare Providers Limited | Real estate | 2000 |
| Healthcare Ventures Group Limited | Health & social care | 2020 |
| Healthier Ltd | Professional & scientific | 2024 |
| Healthtech Advisory Partners Limited | Information & communication | 2023 |
| Healthwest PCN Ltd | Health & social care | 2022 |
| Healthxbridge Ltd | Professional & scientific | 2025 |
| Healthy Balance Limited | Health & social care | 2019 |
| Healthy Food Services Ltd | Wholesale & retail | 2007 |
| Healthy Life BR Ltd | Wholesale & retail | 2022 |
| Healthy Roots Ltd | Health & social care | 2025 |
| Hear 2 Heal Ltd | Health & social care | 2026 |
| Hear the DIN Music Ltd | Information & communication | 2022 |
| Hearne's Properties Limited | Real estate | 2023 |
| Hearne's Rentals Limited | Real estate | 2020 |
| Hearne's Sales Limited | Wholesale & retail | 2015 |
| Hearngrove Estate Management Company Limited | Hospitality | 1974 |
| Hearo Phonics Ltd | Education | 2026 |
| Heart & Soul Beauty Ltd | Extraterritorial | 2013 |
| Heart and Serpent Ltd | Wholesale & retail | 2025 |
| Heart of AI CIC | Health & social care | 2025 |
| Heart of BS13 Ltd | Other services | 1999 |
| Heart to Heart Bristol Ltd | Health & social care | 2024 |
| Heart to Heart Mental Health Hub CIC | Health & social care | 2025 |
| Heartfelt Ceremony Ltd | Other services | 2018 |
| Hearth Therapies Ltd | Health & social care | 2024 |
| Hearthcare Limited | Health & social care | 2025 |
| Hearts to Care Ltd | Health & social care | 2023 |
| Heartsignature & Co. Ltd. | Other services | 2024 |
| Heartstone Hospitality Ltd | Hospitality | 2025 |
| Heartwired Ltd | Extraterritorial | 2020 |
| Heartwood Collective Ltd | Hospitality | 2026 |
| Heartwood Festival Ltd | Arts & recreation | 2022 |
| Heartwood Publishing Ltd | Information & communication | 2020 |
| Heat Hub Plumbing and Heating Ltd | Construction | 2023 |
| Heat Serve Solutions Ltd | Administrative & support | 2014 |
| Heatflux Ltd | Professional & scientific | 2017 |
| Heath Building Projects Limited | Construction | 2021 |
| Heath Family Limited | Financial services | 2023 |
| Heath Management (Sneyd Park) Limited | Households | 2001 |
| Heathcroft Care Homes Ltd | Health & social care | 2023 |
| Heather & Alison Limited | Real estate | 2008 |
| Heather Cowper Media Ltd | Information & communication | 2010 |
| Heather House Management Company Ltd | Households | 2018 |
| Heather Knight Creative Limited | Professional & scientific | 2016 |
| Heather Mclaughlin Design Ltd | Professional & scientific | 2024 |
| Heathfield Management Company (Taunton) Limited | Households | 2017 |
| Heathlands (Bridge Road Management) Limited | Households | 1982 |
| Heathside Veterinary Practice Limited | Extraterritorial | 2001 |
| Heathway Property Company Limited | Real estate | 1987 |
| Heating Associated Services Ltd | Construction | 2017 |
| Heaton Investco Ltd | Financial services | 2026 |
| Heatwave Events Ltd | Arts & recreation | 2023 |
| Heaven and Hell Piercing Ltd | Wholesale & retail | 2024 |
| Heaven Nails & Spa Ltd | Other services | 2020 |
| Heavenandstars Ltd | Hospitality | 2019 |
| Heavenfield Ltd | Professional & scientific | 2024 |
| Heavenly Casa Limited | Construction | 2025 |
| Heavenly Homes and Gardens Limited | Wholesale & retail | 2017 |
| Heavenly Homewares Limited | Wholesale & retail | 2026 |
| Heavenly Mannas Ltd | Hospitality | 2025 |
| Heavenz Drip Ltd | Wholesale & retail | 2025 |
| Heavy Sky Limited | Arts & recreation | 2014 |
| Heavy Vehicle Brakes Limited | Wholesale & retail | 1999 |
| Hecla Straits LLP | | 2020 |
| Hecom Limited | Professional & scientific | 2004 |
| Heddle Education Ltd | Education | 2025 |
| Hedgehog and FOX Ltd | Extraterritorial | 2014 |
| Hedgehog Design Ltd | Professional & scientific | 2024 |
| Hedhes Limited | Professional & scientific | 2024 |
| Hedi Barbers Ltd | Other services | 2026 |
| Hedoniq Ltd | Wholesale & retail | 2021 |
| Heeley Actuarial Ltd | Information & communication | 2015 |
| Heelstone Developments Limited | Administrative & support | 2013 |
| Heelstone Hotels Group Limited | Professional & scientific | 2015 |
| Heenan & Malton Ltd | Real estate | 2020 |
| Heetvi Ltd | Real estate | 2024 |
| Hegarty House Ltd | Information & communication | 2024 |
| Hegner Limited | Transport & logistics | 2015 |
| Heidi Loughlin Limited | Financial services | 2024 |
| Heidi's Burger Limited | Hospitality | 2025 |
| Heightwire Ltd | Professional & scientific | 2020 |
| Heiress Estella Ltd | Other services | 2026 |
| Heiress Ltd | Other services | 2018 |
| Hekton LP | | 2012 |
| Heleli Ltd | Information & communication | 2019 |