| Horizon Promotional Products Limited | Manufacturing | 2012 |
| Horizon Property Brickwork Ltd | Construction | 2022 |
| Horizon Property Construction Ltd. | Real estate | 2021 |
| Horizon Property Homes Ltd | Real estate | 2022 |
| Horizon River Software Ltd | Information & communication | 2025 |
| Horizon Social Ltd | Wholesale & retail | 2025 |
| Horizon Trading Partners Ltd | Information & communication | 2017 |
| Horizon Windscreens Ltd | Wholesale & retail | 2024 |
| Horizonext Software Technologies Ltd | Information & communication | 2025 |
| Horizonfleck Nexus Limited | Information & communication | 2024 |
| Horizonflow Saas Ltd | Information & communication | 2025 |
| Horizonhandcrafted Ltd | Wholesale & retail | 2025 |
| Hormuz Ltd | Construction | 2021 |
| Horn Development Association Community Interest Company | Other services | 2009 |
| Horn of Africa Coffee Traders Limited | Wholesale & retail | 2025 |
| Horn of Africa Development and Information Ltd | Administrative & support | 2016 |
| Hornbeam Academy Ltd | Education | 2021 |
| Hornsey Commercial Management Limited | Professional & scientific | 2016 |
| Horological Innovations Ltd | Wholesale & retail | 2019 |
| Horsefair Property Management Limited | Real estate | 2013 |
| Horseman Holdings Ltd | Real estate | 2015 |
| Horses With Hairy Hooves Limited | Professional & scientific | 2023 |
| Horton Earth Side Space Logistics Ltd | Transport & logistics | 2025 |
| Horus Capital Investment Group Ltd | Financial services | 2023 |
| Horus Media Art Ltd | Information & communication | 2021 |
| Hosadia Trading Company (HTC) Ltd | Financial services | 2025 |
| Hoscon Ltd | Professional & scientific | 2025 |
| Hose & Line Ltd | Manufacturing | 2026 |
| Hoshing Creation Ltd | Wholesale & retail | 2025 |
| Hosii Limited | Wholesale & retail | 2021 |
| Hosking MOT and Service Centre Ltd | Wholesale & retail | 2024 |
| Hoskins & Ashbery Electrical Ltd | Construction | 2025 |
| Hoso Dezain Limited | Administrative & support | 2019 |
| Hospital Radio Glamorgan DAB Ltd | Information & communication | 2025 |
| Hospitality and Bars Ltd | Hospitality | 2018 |
| Hospo Consultants Ltd | Other services | 2026 |
| Hossain Food Store Ltd | Wholesale & retail | 2022 |
| Hossain Letting and Property Ltd | Real estate | 2026 |
| Hossam ALI for Wholesale and Retail Trade Ltd | Wholesale & retail | 2025 |
| Hosseini Limited | Health & social care | 2024 |
| Hosseini Properties Ltd | Real estate | 2024 |
| Host 42 Ltd | Administrative & support | 2012 |
| Host Gallery Ltd | Wholesale & retail | 2018 |
| Host My Homes Ltd | Hospitality | 2023 |
| Host Ventura Direct Limited | Information & communication | 2014 |
| Host Wales (Aber) Ltd | Real estate | 2025 |
| Hostforgen Ltd | Information & communication | 2025 |
| Hostfox Limited | Professional & scientific | 1975 |
| Hosting Limited | Information & communication | 2024 |
| Hostinow Ltd | Information & communication | 2023 |
| Hostly Property Ltd | Real estate | 2025 |
| Hostmamba Ltd | Information & communication | 2018 |
| Hostpitality Stays Limited | Hospitality | 2026 |
| Hot Asia Holdings Limited | Hospitality | 2016 |
| Hot BOB Ltd | Hospitality | 2023 |
| Hot Box Fast Food Ltd | Hospitality | 2019 |
| Hot Flush Club Ltd | Information & communication | 2018 |
| Hot Mess Products Ltd | Wholesale & retail | 2020 |
| Hot Pantry Limited | Manufacturing | 2017 |
| Hot ROD Burger Ltd | Hospitality | 2017 |
| Hot Topic Entertainment Ltd | Wholesale & retail | 2016 |
| HOT2COLD Sauna Co. Ltd | Other services | 2026 |
| Hotbox Fish Bar Ltd | Hospitality | 2019 |
| Hotel 24 7 Limited | Hospitality | 2023 |
| Hotel Installation Ltd | Construction | 2019 |
| Hotel Kaecen Ltd | Professional & scientific | 2025 |
| Hotel LA Tour Birmingham Limited | Hospitality | 2009 |
| Hotel RM Support Ltd | Hospitality | 2017 |
| Hotel Services Group Ltd | Extraterritorial | 2022 |
| Hotel Systems & Solutions Limited | Information & communication | 2014 |
| Hotelco Property Investors Limited | Hospitality | 2019 |
| Hoteliers College Ltd | Education | 2022 |
| Hoten Ltd | Agriculture & fishing | 2022 |
| Hotpod Yoga Cardiff Ltd | Arts & recreation | 2017 |
| Hotpot Spot Limited | Hospitality | 2016 |
| Hotstar SIX Ltd | Wholesale & retail | 2021 |
| Hotstash Limited | Hospitality | 2025 |
| Hottie's Affairs Limited | Professional & scientific | 2018 |
| Hotwindfly Enterprise Ltd | Wholesale & retail | 2024 |
| Hotwolf Limited | Information & communication | 2015 |
| Houd Labs Ltd | Information & communication | 2019 |
| Houme Ltd | Wholesale & retail | 2025 |
| Houna.Property Ltd | Hospitality | 2024 |
| Hounsell Networking Solutions Limited | Information & communication | 2020 |
| Houqq Ltd | Wholesale & retail | 2025 |
| House 7 Creative Limited | Information & communication | 2023 |
| House Data Ltd | Information & communication | 2025 |
| House of Autos Limited | Wholesale & retail | 2021 |
| House of Balloons NE Ltd | Wholesale & retail | 2018 |
| House of Beauty Salon Ltd | Other services | 2019 |
| House of CA Limited | Administrative & support | 2021 |
| House of Carpets London Ltd | Construction | 2025 |
| House of CM Ltd | Health & social care | 2025 |
| House of D'Anjou Ltd | Arts & recreation | 2023 |
| House of Enoch Carpentry & Building Works Ltd | Construction | 2015 |
| House of Experience Ltd | Administrative & support | 2012 |
| House of Firas Limited | Health & social care | 2022 |
| House of Kagu Ltd | Wholesale & retail | 2019 |
| House of Muse Beauty Group Ltd | Wholesale & retail | 2023 |
| House of NJ Limited | Other services | 2026 |