| Hong Kong Tobacco Company Limited | Professional & scientific | 1990 |
| Hood Napier and Associates Ltd | Professional & scientific | 2021 |
| Hoods Property Management Ltd | Real estate | 2025 |
| Hoods Residential Ltd | Real estate | 2021 |
| Hookedin Marketing Solutions Ltd | Professional & scientific | 2024 |
| Hooves & Love Limited | Wholesale & retail | 2018 |
| HOP to Talent Limited | Administrative & support | 2017 |
| Hopbine Court Management Limited | Households | 2007 |
| Hope Church Guildford Limited | Other services | 2007 |
| Hope Keith Villagers Trust(The) | Health & social care | 1984 |
| Hope Life Sciences Limited | Professional & scientific | 2024 |
| Hops and Beers Ltd | Manufacturing | 2022 |
| Hopsteiner Services Limited | Administrative & support | 2021 |
| Horizon & Dorset Resin Flooring Limited | Construction | 2024 |
| Horizon Building & Cleaning Services Ltd | Construction | 2022 |
| Horizon Consultants Ltd | Professional & scientific | 2019 |
| Horsell Estates Ltd | Construction | 2015 |
| Horseshoe Lane West (Guildford) Management Company Ltd | Households | 2025 |
| Horsham Lighting Ltd | Wholesale & retail | 2025 |
| Hortons Heritage Limited | Administrative & support | 2024 |
| Hortus Garden Specialists Ltd. | Other services | 2017 |
| Host Hospitality Ltd | Hospitality | 2020 |
| Hostlane Limited | Real estate | 1998 |
| Hot Pink Productions Ltd | Professional & scientific | 2024 |
| Hotel Hotline Limited | Administrative & support | 2024 |
| Hound House Films Ltd | Information & communication | 2017 |
| Hounds Immersive Ltd | Arts & recreation | 2026 |
| House of H and H Ltd | Hospitality | 2025 |
| House of Hair & Beauty Ltd | Other services | 2004 |
| House of Masters Ltd | Professional & scientific | 2018 |
| House of Programmes Ltd | Other services | 2019 |
| House of Tailoring Surrey Ltd | Other services | 2026 |
| Household Angels Limited | Households | 2016 |
| Houston Motor Cars Limited | Wholesale & retail | 2006 |
| Houston Securities Limited | Real estate | 1999 |
| Houx Ltd | Other services | 2020 |
| Howard Morley & Sons Limited | Real estate | 2010 |
| Hozah Ltd | Information & communication | 2017 |
| Hozah Parking Limited | Information & communication | 2016 |
| HPR 2022 Limited | Professional & scientific | 2022 |
| HR & Leadership Coaching Ltd | Administrative & support | 2020 |
| HRD (S.E.) Limited | Arts & recreation | 1993 |
| HRD Construction Services Limited | Construction | 2025 |
| HRG Property Investments Limited | Real estate | 2017 |
| HRG Urology Services Limited | Health & social care | 2012 |
| Hrinpractice Limited | Professional & scientific | 2009 |
| Hsquared Services Ltd | Professional & scientific | 2020 |
| Htgas Ltd | Construction | 2023 |
| Huber Property Holdings Limited | Real estate | 2024 |
| Hudson Planning Limited | Professional & scientific | 2010 |
| Hudson Tobacco Company Limited | Professional & scientific | 1985 |
| Huduma Limited | Information & communication | 2011 |
| Hues Design Studio Ltd | Wholesale & retail | 2023 |
| Human Creative Ltd | Information & communication | 2022 |
| Human Dynamics Research Limited | Professional & scientific | 2024 |
| Human Performance Hub Ltd | Arts & recreation | 2018 |
| Human State Training Ltd | Education | 2026 |
| Human Static Limited | Information & communication | 2026 |
| Humanity to Work Limited | Professional & scientific | 2013 |
| Humid Productions Limited | Information & communication | 2002 |
| Humphrey Edwards and Co.,Limited | Real estate | 1937 |
| Hung the Moon Limited | Administrative & support | 2021 |
| Hungarian Cultural Association | Education | 2011 |
| Hungdou Limited | Wholesale & retail | 2024 |
| Hunnyhill Management Limited | Households | 2023 |
| Huntersmoon Properties Ltd | Information & communication | 2025 |
| Hunterswood MC Ltd | Households | 2019 |
| Hurlands Residents Company (Puttenham) Limited | Extraterritorial | 1977 |
| Hurst LEA Limited | Financial services | 2013 |
| Hurstmere House Limited | Households | 1975 |
| Hurtberry Limited | Extraterritorial | 2023 |
| Hurtwood Cafe Ltd | Hospitality | 2023 |
| Hurtwood Cycles Ltd | Wholesale & retail | 2023 |
| Hurtwood Events CIC | Arts & recreation | 2023 |
| Hurtwood Leisure Ltd | Hospitality | 2009 |
| Hurtwood Property Ltd | Real estate | 2023 |
| Hustle & Hive Marketing Ltd | Professional & scientific | 2018 |
| Hustle Communications LLP | | 2016 |
| Hutility Ltd | Professional & scientific | 2026 |
| Hutley & Humm Limited | Other services | 2013 |
| Hutley Group (Management) Limited | Professional & scientific | 1998 |
| Hutley Land (London) Limited | Real estate | 1993 |
| Hutley Wintershall Estate Company Limited | Real estate | 1990 |
| Hutton Asset Management Limited | Other services | 2018 |
| HW & C Construction Limited | Construction | 2011 |
| HW & C Developers Limited | Construction | 2018 |
| Hydra Strategy Limited | Professional & scientific | 2016 |
| Hydronix Limited | Manufacturing | 1982 |
| Hydrotherm GAS Services Ltd | Construction | 2017 |
| Hyperion Installation Limited | Construction | 2025 |
| Hyperion Systems Limited | Information & communication | 1985 |
| Hypernova Systems Ltd | Information & communication | 2024 |
| Hypersonic Laboratories Games Development Ltd | Information & communication | 2024 |
| Hypersonic Laboratories UK Ltd | Information & communication | 2024 |
| Hyphae Interactive Ltd | Professional & scientific | 2023 |
| Hyphae Learning Ltd | Education | 2023 |
| Hyphae Media Ltd | Professional & scientific | 2023 |
| Hyphae Primary Learning Ltd | Education | 2024 |
| HYS Services Ltd | Other services | 2018 |
| Hysentry Ltd | Information & communication | 2026 |