| Humble AI Limited | Information & communication | 2022 |
| Humble Dwellings Limited | Real estate | 2024 |
| Hume Family Investments UK Limited | Real estate | 2023 |
| Humpecon Ltd | Professional & scientific | 2026 |
| Humph Limited | Information & communication | 1996 |
| Huncalife UK Limited | Wholesale & retail | 2018 |
| Hundred Homes Limited | Real estate | 2021 |
| Hungarian School Cambridge C.I.C. | Education | 2017 |
| Hungry Hive Ltd | Hospitality | 2025 |
| Hunguntung Ltd | Wholesale & retail | 2024 |
| Hunstanton Watersports Ltd | Arts & recreation | 2025 |
| Hunt Green Ltd | Health & social care | 2020 |
| Hunterfield Limited | Wholesale & retail | 2008 |
| Hunters Gate (One) Management Company Limited | Households | 2007 |
| Hunters Park Management Company Limited | Households | 2010 |
| Huntingdon Chamber of Commerce Limited | Professional & scientific | 2005 |
| Huntingdon Sushi Limited | Hospitality | 2023 |
| Huntingdonshire Chamber of Commerce Limited | Professional & scientific | 2005 |
| Hunts Offroad Ltd | Wholesale & retail | 2025 |
| Hupkes Wijma (UK) Limited | Wholesale & retail | 1997 |
| Hurmuzache Ionit Ltd | Manufacturing | 2025 |
| Hurrell Capital Limited | Real estate | 2023 |
| Hurrell Phillips Holdings Limited | Real estate | 2023 |
| Hurst Park Systems Ltd | Information & communication | 1994 |
| Hurstplain (Maintenance) Limited | Households | 1979 |
| Huruma Care Services Ltd | Public administration | 2023 |
| Husanu Ltd | Manufacturing | 2026 |
| Hushtell Technologies Ltd | Information & communication | 2022 |
| Husm Ltd | Wholesale & retail | 2025 |
| Hutanbio Limited | Professional & scientific | 2019 |
| Hutano Diagnostics Ltd | Professional & scientific | 2018 |
| Hutchings Residential Limited | Real estate | 2020 |
| Hutchinson and Tran Consulting Limited | Health & social care | 2019 |
| Hutchinson and Tran Holdings Limited | Administrative & support | 2019 |
| Huttie Building Services Limited | Other services | 2009 |
| Huttie Electrical Ltd | Construction | 2013 |
| Huttie Group Ltd. | Administrative & support | 2017 |
| Huttie Renewable Energy Limited | Other services | 2015 |
| Huxley Bertram Engineering Group Limited | Financial services | 2024 |
| Huxley Bertram Engineering Limited | Manufacturing | 1997 |
| Huxley Graphics Ltd | Information & communication | 2016 |
| Huxley Inspections Ltd | Professional & scientific | 2025 |
| HVM Consultancy Ltd | Information & communication | 2019 |
| HW Dean & SON Ltd | Real estate | 2010 |
| Hwashow Industry Co., Ltd | Extraterritorial | 2015 |
| HWC Contractors Ltd | Construction | 2026 |
| HX LAB Ltd | Professional & scientific | 2019 |
| Hybrid Media AI Ltd | Information & communication | 2013 |
| Hybrid Software UK Limited | Manufacturing | 2020 |
| Hycomplate Ltd | Manufacturing | 2025 |
| Hydrachat Ltd | Wholesale & retail | 2025 |
| Hydro Genie Solutions Limited | Professional & scientific | 2017 |
| Hydro-Fur-Apy Limited | Agriculture & fishing | 2017 |
| HYF (Pipes) Ltd | Manufacturing | 2022 |
| Hyfly Ltd | Transport & logistics | 2023 |
| Hygge Cambridge Ltd | Manufacturing | 2025 |
| Hygieia Cura Limited | Wholesale & retail | 2022 |
| Hylton Advisory Services Limited | Professional & scientific | 2022 |
| Hynt Labs Limited | Information & communication | 2019 |
| Hype Wire Ltd | Wholesale & retail | 2020 |
| Hyped and Vaulted Ltd | Wholesale & retail | 2025 |
| Hyperactive Ltd. | Wholesale & retail | 2013 |
| Hyperaxis Ltd | Manufacturing | 2026 |
| Hypercert UK Company Limited | Professional & scientific | 2025 |
| Hyperion Research Ltd | Professional & scientific | 2017 |
| Hyperlink Solutions Ltd | Wholesale & retail | 2021 |
| Hyperspheric Solutions Limited | Information & communication | 2000 |
| Hyphen S Motors Ltd | Wholesale & retail | 2024 |
| Hypnotika Films Ltd | Information & communication | 2012 |
| Hypro EU Limited | Manufacturing | 1991 |
| Hyran Technologies Ltd | Information & communication | 2022 |
| HZL Property Ltd | Real estate | 2024 |
| I a C Design Ltd | Manufacturing | 2025 |
| I AM NOT Holding Limited | Extraterritorial | 2017 |
| I Barber Limited | Information & communication | 2015 |
| I Learn for Enterprise Limited | Education | 2013 |
| I R Electrical Limited | Construction | 2015 |
| I Shaw Love Nails Ltd | Other services | 2020 |
| I'M Still Standing Ltd | Real estate | 2023 |
| I-Cook Club Limited | Hospitality | 2018 |
| I-Medix Limited | Health & social care | 2024 |
| I. O. S. Group Ltd | Administrative & support | 2019 |
| I.Auto Detailing Ltd | Administrative & support | 2023 |
| I.R. Immigration Law LLP | | 2011 |
| I2I Capital Limited | Financial services | 2021 |
| I4U Pet Limited | Wholesale & retail | 2026 |
| I4UNUTRA Limited | Wholesale & retail | 2026 |
| IA Cart Hub Ltd | Wholesale & retail | 2025 |
| IAN Bell Elite Rights LLP | | 2017 |
| IAN Colvin Consulting Ltd | Administrative & support | 2022 |
| IAN Critten Accountancy Limited | Professional & scientific | 2008 |
| IAN Lloyd & Partners Limited | Professional & scientific | 2015 |
| IAN Mackriell Construction Limited | Construction | 2014 |
| Iancu Quality Composites Ltd | Manufacturing | 2026 |
| IAP Aircraft Maintenance Ltd | Manufacturing | 2025 |
| Iatromerit Ltd | Health & social care | 2011 |
| Ibananas Limited | Information & communication | 2006 |
| Ibanoglu Limited | Wholesale & retail | 2020 |
| Ibcpa UK Ltd | Professional & scientific | 2025 |
| Ibex Solutions Limited | Professional & scientific | 2009 |