| Hooked on Golf Limited | Education | 2025 |
| Hope Farm Dorset Limited | Agriculture & fishing | 2019 |
| Hope Harvester Care Ltd | Health & social care | 2025 |
| Hope NOW Limited | Other services | 1998 |
| Hopespassion Ltd | Health & social care | 2017 |
| Hopkins Autoworks LLP | | 2024 |
| Hopnetic Limited | Information & communication | 2020 |
| Hops & Grapes Ltd | Wholesale & retail | 2017 |
| Hopwood Electrical Solutions Ltd | Construction | 2010 |
| Horde Capital Partners Ltd | Financial services | 2025 |
| Horde Developments Ltd | Construction | 2019 |
| Horde Holdings Limited | Financial services | 2025 |
| Horde Ltd | Real estate | 2019 |
| Horizon Cars Service Ltd | Wholesale & retail | 2023 |
| Horizon Power and Energy Ltd | Professional & scientific | 2012 |
| Horizon Projects Limited | Construction | 2005 |
| Horizon Property (Rscr) Ltd | Real estate | 2019 |
| Horizon Resourcing Ltd | Administrative & support | 2025 |
| Horizon Seven Consulting Ltd | Professional & scientific | 2018 |
| Horizon Venture Assets Ltd | Construction | 2024 |
| Horizons Photography Ltd | Professional & scientific | 2020 |
| Horn Lettings Limited | Administrative & support | 2011 |
| Horndean Healthcare Ltd | Real estate | 2025 |
| Hornet I.T. Limited | Information & communication | 2004 |
| Horns Drove Community Childcare Ltd | Health & social care | 2005 |
| Horrex Engineering Ltd | Manufacturing | 2013 |
| Horrizonte Ltd | Information & communication | 2025 |
| Horse & Beetle Ltd. | Professional & scientific | 2018 |
| Horsepower Pictures Limited | Information & communication | 2020 |
| Horseshoe Apartments Limited | Real estate | 2019 |
| Horseshoe Hire and Transport Ltd | Administrative & support | 2022 |
| Horseshoe Projects Ltd | Administrative & support | 2011 |
| Horsham Carpentry & Building Ltd | Construction | 2019 |
| Horticultural Sales & Consultancy Ltd | Wholesale & retail | 2018 |
| Horton Barns Limited | Construction | 2003 |
| Horton Heating Limited | Construction | 2012 |
| Horus Mechanical Ltd | Construction | 2021 |
| Hoskins Innovations Limited | Other services | 2025 |
| Hospitality Cleaning Services Ltd | Administrative & support | 2025 |
| Hospitality Systems UK Limited | Administrative & support | 2017 |
| Host Management Ltd | Hospitality | 2003 |
| Hot Cathode Limited | Professional & scientific | 2015 |
| Hot Chocolate Bomb Limited | Information & communication | 2024 |
| Hot House Heating Limited | Construction | 2022 |
| Hot TUB Care Limited | Wholesale & retail | 2006 |
| Hot TUB Recovery Ltd | Professional & scientific | 2018 |
| Hotch Potch Gluten Free Savouries Limited | Manufacturing | 2015 |
| Hotel Haveli Ltd | Hospitality | 2025 |
| Hotpod Yoga Southampton Ltd | Arts & recreation | 2023 |
| Hotpotea Limited | Wholesale & retail | 2009 |
| Hotston Specialist Cleaning Solutions Ltd | Administrative & support | 2024 |
| Hougoumont and Napoleon House Limited | Households | 1983 |
| Houlihan Carpentry Limited | Construction | 2003 |
| Hound Owls Preschool Limited | Health & social care | 2020 |
| Hound Properties (Southampton) Ltd | Real estate | 2024 |
| Houndhikes Ltd | Other services | 2022 |
| Hounsdown School | Education | 2011 |
| House & Home Services Limited | Construction | 2003 |
| House Box Star M Ltd | Extraterritorial | 2017 |
| House Box Star Ukeig | | 2017 |
| House of Anna Limited | Real estate | 2023 |
| House of Beauty NO 52 Ltd | Other services | 2025 |
| House of Bourn Ltd | Transport & logistics | 2024 |
| House of Copy (Winchester) Limited | Professional & scientific | 2024 |
| House of Frigga Ltd | Real estate | 2024 |
| House of Locks Limited | Other services | 2021 |
| House of Reilly Hair and Beauty Limited | Other services | 2014 |
| Househam Sprayers Limited | Manufacturing | 1991 |
| Houseman Limited | Professional & scientific | 1920 |
| Houseofsussex Limited | Extraterritorial | 2017 |
| Housing Community and Legal Support Community Interest Company | Health & social care | 2024 |
| Howard Global Consulting Limited | Professional & scientific | 2025 |
| Howard Health Systems Ltd | Information & communication | 2026 |
| Howard Place (Weybridge) Management Limited | Households | 2018 |
| Howard Road Tenants Association Ltd | Households | 2008 |
| Howdon Environmental Ltd | Other services | 2025 |
| Howl Multisport Swimming Limited | Arts & recreation | 2024 |
| Howlett Homes Limited | Health & social care | 2013 |
| Howper 801 Limited | Financial services | 2020 |
| HP Packaging Limited | Administrative & support | 2024 |
| HP Pump Services Ltd | Construction | 2009 |
| HPL- Hamtun Properties Ltd | Real estate | 2015 |
| Hpmt Management Ltd | Information & communication | 2024 |
| Hpsj Ltd | Hospitality | 2018 |
| HR & Sons Properties Ltd | Real estate | 2020 |
| HR Plumbing & Heating Ltd | Construction | 2020 |
| HR Pro Consulting Limited | Professional & scientific | 2012 |
| HR Reimagined Ltd | Administrative & support | 2020 |
| Hr&Ak 2 Limited | Hospitality | 2018 |
| Hrcats Ltd | Professional & scientific | 2020 |
| HRG F&C Ltd | Hospitality | 2025 |
| HRG Tree Surgeons Limited | Agriculture & fishing | 2012 |
| HS Autotech Ltd | Wholesale & retail | 2007 |
| HSA Professional Consultants Limited | Professional & scientific | 2017 |
| HSD Distribution Limited | Wholesale & retail | 2011 |
| Hsdn Investments Ltd | Real estate | 2021 |
| HSE Industrial Cleaning Services Limited | Other services | 2019 |
| HSE Training Online Limited | Education | 2023 |
| HSH Property Investments Limited | Real estate | 2026 |
| Hshg Ltd | Hospitality | 2018 |