| Highbury Park Investments Limited | Financial services | 2013 |
| Highcliff Court Eastbourne Limited | Real estate | 2015 |
| Higher Power Media Ltd | Information & communication | 2025 |
| Highfields JV Ltd | Construction | 2024 |
| Highgate Strategy Consulting Ltd | Professional & scientific | 2026 |
| Highlander Controls Limited | Manufacturing | 2017 |
| Highlands Management (Wiltshire Way) Limited | Households | 1987 |
| Highpoint Safety Ltd | Public administration | 2018 |
| Highq Tutors Ltd | Education | 2024 |
| Hightower Consultancy Ltd | Construction | 2014 |
| Highway Consulting Limited | Professional & scientific | 2015 |
| Hiicem Rugby Holdings Limited | Professional & scientific | 2024 |
| Hiicem Rugby Limited | Professional & scientific | 2024 |
| Hiiroc Carbon Limited | Professional & scientific | 2024 |
| Hiiroc Egypt Limited | Professional & scientific | 2023 |
| Hiiroc Hydrogen Limited | Professional & scientific | 2023 |
| Hiiroc Limited | Administrative & support | 2019 |
| Hiiroc Marine Limited | Professional & scientific | 2025 |
| Hiiroc Mena Holdings Limited | Professional & scientific | 2023 |
| Hiiroc Nominees Limited | Professional & scientific | 2023 |
| Hiiroc North America Holdings Limited | Professional & scientific | 2023 |
| Hiiroc UK Limited | Professional & scientific | 2022 |
| Hiiroc-X Developments Limited | Professional & scientific | 2021 |
| Hilbert Homes Limited | Real estate | 2023 |
| Hild Solutions Ltd | Professional & scientific | 2022 |
| Hilden Leisure LLP | | 2010 |
| Hilden Park Limited | Information & communication | 2018 |
| Hildenbrook Farm Management Company Limited | Households | 1998 |
| Hill House Home (UK Retail) Limited | Wholesale & retail | 2022 |
| Hillingbrook Limited | Administrative & support | 2020 |
| Himalayas Natural Gems Miners Limited | Mining & quarrying | 2016 |
| Hinges of Destiny Limited | Professional & scientific | 2025 |
| Hingtink Ltd | Construction | 2003 |
| Historical Metallurgy Society Limited(The) | Other services | 1979 |
| Hitchell Financial Planning Limited | Professional & scientific | 2010 |
| Hive EAT 1 Limited | Wholesale & retail | 2021 |
| Hive Hubs 1 Limited | Hospitality | 2020 |
| Hive Hubs 2 Limited | Hospitality | 2020 |
| Hive Hubs 3 Limited | Hospitality | 2020 |
| Hive Hubs 4 Limited | Hospitality | 2021 |
| Hive Hubs 5 Limited | Hospitality | 2023 |
| Hive Hubs Holdings Limited | Hospitality | 2018 |
| Hive Practice Accounting Ltd | Professional & scientific | 2021 |
| Hive Tunbridge Wells Limited | Other services | 2022 |
| Hiveloop Ltd | Wholesale & retail | 2026 |
| Hjdn Ltd | Professional & scientific | 2020 |
| Hljv 2 Limited | Real estate | 2024 |
| Hljv Limited | Construction | 2023 |
| Hlsf Limited | Construction | 2010 |
| HM Services South East Limited | Manufacturing | 2019 |
| HMJ Contractors Limited | Administrative & support | 2024 |
| HMM Resale Limited | Wholesale & retail | 2025 |
| Hmmt 1 Ltd | Real estate | 2024 |
| HMS Legacy CIC | Administrative & support | 2025 |
| Hockley Smith Fine Art Consulting Ltd | Professional & scientific | 2008 |
| Hodges Property Group Ltd | Administrative & support | 2026 |
| Hogan & Co Construction Limited | Construction | 2020 |
| Holbrook Global Advisers Ltd | Professional & scientific | 2021 |
| Holbrook Global Limited | Professional & scientific | 2019 |
| Holden Park Management Ltd | Real estate | 2025 |
| Holiday Cars Direct Limited | Administrative & support | 1997 |
| Holland Park Search Limited | Administrative & support | 2021 |
| Hollingbourne Holdings Ltd | Financial services | 2016 |
| Hollingbourne Plastering Services Limited | Construction | 2012 |
| Hollmac (Brecknock) Ltd | Hospitality | 2020 |
| Hollonds Woodland Management Limited | Financial services | 2022 |
| Hollyshaw Estates Company Limited | Households | 1993 |
| Holmewood House Ltd | Real estate | 2025 |
| Holmewood House Properties Limited | Other services | 1937 |
| Holmewood House School | Education | 1979 |
| Holmewood House Services Limited | Education | 2005 |
| Holmewood Ridge (East) Limited | Administrative & support | 1967 |
| Holobel Limited | Real estate | 2021 |
| Holton LEE Limited | Hospitality | 1993 |
| Holtons Consulting Ltd | Professional & scientific | 2025 |
| Holy Mush Ltd | Hospitality | 2025 |
| Holyday Ltd | Information & communication | 2019 |
| Home Farm Frant Management Company Limited | Households | 1996 |
| Home Independence Services Ltd | Construction | 2008 |
| Home Made Afro Food Limited | Hospitality | 2025 |
| Home of Eunoia Limited | Health & social care | 2024 |
| Home Wheels Auto Ltd | Wholesale & retail | 2024 |
| Home-Start South West Kent | Health & social care | 2004 |
| Homes Four YOU Limited | Real estate | 2007 |
| Honey Bubble Limited | Hospitality | 2019 |
| Honk Design Ltd | Professional & scientific | 2025 |
| Honus W Retail Ltd | Wholesale & retail | 2024 |
| Hook UP Apps Ltd | Information & communication | 2020 |
| Hooked Logic Ltd | Professional & scientific | 2021 |
| Hookgreen Limited | Agriculture & fishing | 2019 |
| Hoopermark Ltd | Professional & scientific | 2013 |
| Hoosei Limited | Information & communication | 2022 |
| Hopes and Beans Ltd | Hospitality | 2020 |
| Hopper Homes Limited | Financial services | 2022 |
| Hopping MAD Leisure Limited | Real estate | 2005 |
| Horizon Blue Limited | Real estate | 2008 |
| Horizon Exploration Limited | Professional & scientific | 1993 |
| Horley and Daly (Hastings) Limited | Administrative & support | 2021 |
| Horp Ltd | Information & communication | 2010 |
| Horse Sense Ltd | Other services | 2025 |