| Higher Road Auto Services Limited | Wholesale & retail | 2015 |
| Higher Road Limited | Real estate | 2025 |
| Higher Safety & Training Solutions Limited | Extraterritorial | 2014 |
| Higher Star Ltd | Education | 2021 |
| Higher Street Properties Limited | Real estate | 2014 |
| HIGHER4HIRE Ltd | Administrative & support | 2004 |
| Higherroadconveniencestore Limited | Wholesale & retail | 2022 |
| Highfield Future Ltd | Information & communication | 2026 |
| Highfield Property Care Ltd | Construction | 2026 |
| Highfield Road Ltd | Real estate | 2019 |
| Highfield South Landfill Ltd | Water & waste | 2026 |
| Highfields Medical Limited | Health & social care | 2021 |
| Highforce Estates Ltd | Real estate | 2005 |
| Highform Consulting Ltd | Professional & scientific | 2022 |
| Highgate Beds Limited | Manufacturing | 1990 |
| Highgate Properties (MCR) Ltd | Real estate | 2025 |
| Highgate Property (UK) Limited | Administrative & support | 2010 |
| Highgrove Consulting Ltd | Administrative & support | 2019 |
| Highland Industrial Estates Limited | Real estate | 2021 |
| Highland Park Insurance Consultants Ltd | Financial services | 2005 |
| Highland Ventures Qiansi Limited | Manufacturing | 2025 |
| Highlands Hideaway Ltd | Construction | 2024 |
| Highlands Trade Limited | Wholesale & retail | 2025 |
| Highlane Developments Ltd | Real estate | 2012 |
| Highleat Properties Limited | Extraterritorial | 1967 |
| Highlife Trade Express Limited | Wholesale & retail | 2020 |
| Highline Scaffolding Ltd | Construction | 2019 |
| Highlink Capital Ltd | Hospitality | 2016 |
| Highlink Ventures Limited | Hospitality | 2015 |
| Highlogic Limited | Extraterritorial | 1999 |
| Highmark EDU Ltd | Education | 2024 |
| Highmast Construction Limited | Extraterritorial | 2017 |
| Highres Biosolutions Limited | Manufacturing | 2008 |
| Highreserve Limited | Real estate | 2005 |
| Highrise Bidco Ltd | Administrative & support | 2021 |
| Highrise Cleanco Ltd | Administrative & support | 2021 |
| Highrise Communications Limited | Professional & scientific | 2016 |
| Highrise Learning Ltd | Education | 2026 |
| Highrise Midco Ltd | Administrative & support | 2021 |
| Highrise Topco Ltd | Administrative & support | 2021 |
| Highsea Consult Ltd | Wholesale & retail | 2025 |
| Highspirit Music Studio Ltd | Manufacturing | 2024 |
| Hightag Global Limited | Wholesale & retail | 2025 |
| Hightechmart Ltd | Wholesale & retail | 2026 |
| Highticketkreator Ltd | Professional & scientific | 2025 |
| Hightown Construction Limited | Construction | 1980 |
| Hightown Mspo Ltd | Transport & logistics | 2009 |
| Hightown Pharmacy (Merseyside) Limited | Wholesale & retail | 2004 |
| Highview Consulting Limited | Information & communication | 2004 |
| Highway Development Group Ltd | Information & communication | 2026 |
| Highway Engineering Limited | Professional & scientific | 2022 |
| Highway Foods Co., Ltd. | Manufacturing | 2019 |
| Highway Maintenance Solutions Ltd | Education | 2014 |
| Highway Media UK Limited | Professional & scientific | 2004 |
| Highway Safety Systems UK Limited | Construction | 2023 |
| Highway Transport MCR Ltd | Transport & logistics | 2022 |
| Highwayman (Dobwalls) Ltd | Hospitality | 2023 |
| Highways East Midlands Limited | Other services | 2017 |
| Highwise Ltd | Wholesale & retail | 2025 |
| Highwood Close RTM Company Limited | Households | 2016 |
| Highwood Properties Ltd | Real estate | 2024 |
| HIH UK Bidco II Limited | Financial services | 2026 |
| HIH UK Bidco III Limited | Financial services | 2026 |
| HIH UK Bidco Limited | Financial services | 2026 |
| Hiiike Ltd | Information & communication | 2024 |
| Hijabee Ltd | Wholesale & retail | 2023 |
| Hijabiatelier by ZAE Limited | Wholesale & retail | 2026 |
| Hijama Manchester Cupping Clinic Ltd | Health & social care | 2022 |
| Hijama Therapy Limited | Health & social care | 2024 |
| Hijaz Trading Ltd | Wholesale & retail | 2020 |
| Hika Homes Ltd | Real estate | 2023 |
| Hikari Coffee Catering Ltd | Hospitality | 2025 |
| Hikari Global Trading Company Limited | Wholesale & retail | 2025 |
| Hikmalight Ltd | Professional & scientific | 2021 |
| Hikoki Publications Limited | Information & communication | 1997 |
| Hilal Meat Products Company PTY Ltd | Wholesale & retail | 2025 |
| Hilan Property Investments Ltd | Real estate | 2025 |
| Hilary Holdings Limited | Real estate | 1963 |
| Hilary Salt | Financial services | 2009 |
| Hilcot Control Systems Limited | Professional & scientific | 2021 |
| Hildaid Properties Limited | Real estate | 2024 |
| Hilde Natura Ltd | Administrative & support | 2025 |
| Hilden Beech Ltd | Information & communication | 2023 |
| Hilden Manufacturing Company Limited | Manufacturing | 1909 |
| Hiley Projects Limited | Information & communication | 2018 |
| Hilfords Limited | Professional & scientific | 2012 |
| Hilgate Properties Ltd | Real estate | 2025 |
| Hilight Solutions CIC | Information & communication | 2023 |
| Hilko Consulting Limited | Information & communication | 2015 |
| Hill Allen Limited | Wholesale & retail | 1980 |
| Hill House Vintage Limited | Information & communication | 2020 |
| Hill Motor Company Ltd | Wholesale & retail | 2019 |
| Hill Project Solutions Limited | Construction | 2017 |
| Hill Top Mansion Developments Limited | Construction | 2025 |
| Hill Transport Limited | Transport & logistics | 2011 |
| Hillaton Investments Limited | Financial services | 1961 |
| Hillbourne Estates 1 Ltd | Real estate | 2023 |
| Hillbourne Estates 2 Ltd | Real estate | 2023 |
| Hillbourne Estates Ltd | Real estate | 2021 |
| Hillbourne Group Ltd | Other services | 2024 |