| Horizon Coaches Limited | Transport & logistics | 2025 |
| Horizon Consulting Group Ltd | Information & communication | 2022 |
| Horizon Consulting Partners Ltd | Arts & recreation | 2026 |
| Horizon Esolutions Limited | Professional & scientific | 2023 |
| Horizon Essentials Ltd | Wholesale & retail | 2024 |
| Horizon Financial Planning Limited | Financial services | 2001 |
| Horizon GEN Limited | Real estate | 2023 |
| Horizon General Insurance Services Limited | Financial services | 2001 |
| Horizon Heights Developments Limited | Construction | 2024 |
| Horizon Holidays Ltd | Administrative & support | 2021 |
| Horizon Home Automation Limited | Other services | 2018 |
| Horizon Home Support Ltd | Health & social care | 2024 |
| Horizon Homes (UK) Limited | Construction | 2006 |
| Horizon Homes Delux Ltd | Real estate | 2025 |
| Horizon Houses Ltd | Real estate | 2026 |
| Horizon Housing Solutions Ltd | Real estate | 2026 |
| Horizon Intelligence Ltd | Professional & scientific | 2020 |
| Horizon Investments Group Ltd | Real estate | 2023 |
| Horizon Leads Ltd | Wholesale & retail | 2025 |
| Horizon Lettings (Midlands) Limited | Real estate | 2024 |
| Horizon Libre Ltd | Wholesale & retail | 2025 |
| Horizon Mark Ltd | Wholesale & retail | 2024 |
| Horizon Motor Trade Limited | Wholesale & retail | 2025 |
| Horizon Oak Ltd | Construction | 2023 |
| Horizon Primary Care Solutions Limited | Information & communication | 2023 |
| Horizon Property Solutions Ltd | Real estate | 2025 |
| Horizon Stars UK Ltd | Real estate | 2025 |
| Horizon Trading Solutions Ltd | Wholesale & retail | 2025 |
| Horizon Wealth Limited | Real estate | 2026 |
| Horizon Zone Ltd | Wholesale & retail | 2024 |
| Horizongloble Limited | Wholesale & retail | 2023 |
| Horizons Civil Works Limited | Construction | 2018 |
| Horizons Medical Services Ltd | Health & social care | 2025 |
| Horizonsquare Properties Ltd | Real estate | 2019 |
| Horizonte Limited | Construction | 2001 |
| Horizonz.Uk Ltd | Wholesale & retail | 2020 |
| Horn of Africa AID | Education | 2009 |
| Horner Pet Rehab & Wellness Centre Ltd | Professional & scientific | 2024 |
| Hornet Exhausts Ltd | Wholesale & retail | 2020 |
| Horos Labs Ltd | Information & communication | 2026 |
| Horse Fair Convenience Ltd | Wholesale & retail | 2025 |
| Horsefair Supermarket Limited | Wholesale & retail | 2011 |
| Horsefair Trader Limited | Hospitality | 2024 |
| Horseshoe and Farrier Supplies (Midlands) Limited | Wholesale & retail | 1983 |
| Horsinvest Limited | Other services | 2016 |
| Horswood (Midlands) Limited | Manufacturing | 1964 |
| Hortellux Limited | Extraterritorial | 1904 |
| Horticare Environmental Services Limited | Agriculture & fishing | 1992 |
| Horticulture Exercise Arts and Life CIC | Education | 2024 |
| Hortons' Estate (Grand Hotel) Limited | Real estate | 2004 |
| Hortons' Estate Developments Limited | Construction | 2005 |
| Hortons' Estate Limited | Construction | 1951 |
| Horus International Ltd | Wholesale & retail | 2023 |
| Horvath Accountants Limited | Professional & scientific | 2020 |
| Horvexa Ltd | Wholesale & retail | 2026 |
| Horwitch Ltd | Professional & scientific | 2024 |
| Horyaal Business Centres Limited | Wholesale & retail | 2015 |
| HOS Imports Ltd | Wholesale & retail | 2022 |
| Hosain's Home and Hope Ltd | Real estate | 2024 |
| Hosanna Lane Ltd | Wholesale & retail | 2025 |
| Hose Counter Coventry Ltd | Manufacturing | 2016 |
| Hoshang KRD Ltd | Wholesale & retail | 2025 |
| Hoshiya Ltd | Hospitality | 2016 |
| Hospitality and Commercial Cleaning Services Ltd | Administrative & support | 2020 |
| Hospitality Corporations Ltd | Wholesale & retail | 2024 |
| HOSPITALITY7812 Ltd | Hospitality | 2024 |
| Hossana Ltd | Real estate | 2024 |
| Host Consulting Ltd | Professional & scientific | 2011 |
| Host Zone Ltd | Wholesale & retail | 2025 |
| Hostco Ltd | Hospitality | 2025 |
| Hosted BHX Ltd | Real estate | 2025 |
| Hostels of Hope Community Interest Company | Hospitality | 2018 |
| Hostelworld Group PLC | Financial services | 2015 |
| Hostelworld Services Limited | Administrative & support | 1993 |
| Hosu Limited | Transport & logistics | 2022 |
| Hot & Crusty Ltd | Hospitality | 2018 |
| Hot Bite Rush Limited | Hospitality | 2025 |
| Hot Chilli (B'Ham) Limited | Hospitality | 2019 |
| Hot Dogs Shrewsbury Ltd | Hospitality | 2019 |
| Hot Hatch Media Ltd | Information & communication | 2014 |
| Hot Hire Ltd | Wholesale & retail | 2024 |
| Hot N Roll Ltd | Hospitality | 2026 |
| Hot Penguin Property Limited | Real estate | 2010 |
| Hot Plate and Grill Ltd | Hospitality | 2025 |
| Hot Shoe Media Ltd | Other services | 2021 |
| Hot Shots Recruitment Ltd | Administrative & support | 2025 |
| Hot Source Records Limited | Administrative & support | 2014 |
| Hot Spicy HUT Limited | Hospitality | 2022 |
| Hot Stuff Pizza & Deserts Ltd | Hospitality | 2024 |
| Hot UK Bargains 247 Ltd | Wholesale & retail | 2025 |
| Hot Wheel Logistics Ltd | Construction | 2025 |
| Hot WOK WOW Limited | Hospitality | 2025 |
| Hotbed Nominees Limited | Administrative & support | 2006 |
| Hotbed Portfolio Managers LLP | | 2012 |
| Hotbed Private Equity Investments Limited | Professional & scientific | 2008 |
| Hotdjkay Entertainment House Limited | Administrative & support | 2024 |
| Hotei 04 Limited | Real estate | 2025 |
| Hotel and Resort Supplies Ltd | Wholesale & retail | 2023 |
| Hotel Gotham Limited | Hospitality | 2014 |
| Hotel Holloway Limited | Hospitality | 2023 |