| HT Capital Limited | Real estate | 2018 |
| HT Homes Limited | Real estate | 2012 |
| HU Stamford Ltd | Hospitality | 2024 |
| Hubble Services Ltd | Administrative & support | 2019 |
| Hubert Bathrooms and Kitchens Ltd | Construction | 2024 |
| Huberto Business Ltd | Transport & logistics | 2017 |
| Hudell Group Limited | Other services | 2026 |
| Hudson Group Limited | Professional & scientific | 2020 |
| Hudson Masonry Ltd | Construction | 2023 |
| Hudsonrose Property and Development Ltd | Real estate | 2024 |
| Huge Impacts Ltd | Wholesale & retail | 2026 |
| Hugh James Surveyors Limited | Professional & scientific | 2012 |
| Hughes & Co (UK Support Services) Ltd | Administrative & support | 2021 |
| Hughes' Health Hub Ltd | Arts & recreation | 2021 |
| Hugo West Limited | Real estate | 2019 |
| Hull Cleaning Services UK Ltd | Transport & logistics | 2026 |
| Hull, Wagstaffe & Co. Limited | Other services | 1974 |
| Human Experience Insights Ltd | Information & communication | 2026 |
| Human HR Services Ltd. | Administrative & support | 2016 |
| Human Rebels Limited | Administrative & support | 2022 |
| Humane Care Services Limited | Health & social care | 2019 |
| Humane Kind Ltd | Information & communication | 2020 |
| Humanity Goods Ltd | Wholesale & retail | 2025 |
| Humanotics Limited | Information & communication | 2018 |
| Hummingbird Digital Limited | Professional & scientific | 2002 |
| Hunar Property Ltd | Real estate | 2019 |
| Hundreds Farm Limited | Agriculture & fishing | 2009 |
| Hungry Boys Cafe Limited | Hospitality | 2020 |
| Hunns Engineering Services Ltd | Professional & scientific | 2016 |
| Hunstanton Lawn Tennis Tournament CIC | Arts & recreation | 2024 |
| Hunt & Coombs LLP | | 2006 |
| Hunter Land Limited | Administrative & support | 2022 |
| Hunter Taylor Building Contractors Limited | Construction | 2023 |
| Huntingdon Office Supplies Limited | Real estate | 1979 |
| Huntingdon PCN Limited | Health & social care | 2024 |
| Hunts Taxis Ltd | Transport & logistics | 2017 |
| Huntsman Builders Limited | Construction | 1976 |
| Huntsmans Gate Consulting Ltd | Professional & scientific | 2023 |
| Hurford & Tebbutt Limited | Construction | 2007 |
| Hurley Communication Services Ltd | Information & communication | 2024 |
| Hurley Specialist Engineering Ltd | Wholesale & retail | 2026 |
| Huss Motor Group Ltd | Wholesale & retail | 2025 |
| Hussein Damani & Co Limited | Real estate | 2014 |
| HUT Healthcare Ltd | Wholesale & retail | 2020 |
| Hutched Limited | Professional & scientific | 2016 |
| Hutchinsons (Chemists) Limited | Real estate | 1948 |
| Hutchinsons Group Limited | Financial services | 2021 |
| Hutson Drilling Limited | Construction | 2014 |
| Huunoo Limited | Information & communication | 2022 |
| Huxley Living Ltd | Wholesale & retail | 2020 |
| HV Wind Ltd | Construction | 2018 |
| HVT Autos Ltd | Wholesale & retail | 2020 |
| HW Development Limited | Information & communication | 2008 |
| HWL Accountants Ltd | Professional & scientific | 2025 |
| HY Bodyshop Limited | Wholesale & retail | 2023 |
| HY Commerical Services Ltd | Administrative & support | 2026 |
| Hybrid Performance Training Ltd | Arts & recreation | 2012 |
| Hyde Park Accounting Ltd | Professional & scientific | 2016 |
| Hyde Solutions Ltd | Administrative & support | 2017 |
| Hydraulic and Pneumatic Supplies Limited | Wholesale & retail | 1997 |
| Hydroforce Pumps Limited | Manufacturing | 2011 |
| Hydrol Limited | Manufacturing | 2012 |
| Hydromarque Group Limited | Financial services | 2020 |
| Hydromarque Limited | Manufacturing | 1987 |
| Hydroponic Gardening Limited | Wholesale & retail | 2024 |
| Hydrostat Ltd. | Professional & scientific | 2011 |
| Hygenavent Limited | Administrative & support | 2009 |
| Hygge Education Limited | Education | 2019 |
| Hygiene Vision Europe Limited | Other services | 2017 |
| Hype Competitions Ltd | Arts & recreation | 2022 |
| Hype Fitness Support Limited | Wholesale & retail | 2025 |
| Hypehub Ltd | Wholesale & retail | 2025 |
| Hypercore Gaming Ltd | Manufacturing | 2024 |
| Hyperfit Ltd | Arts & recreation | 2023 |
| Hyperior Limited | Information & communication | 2026 |
| Hyperspace Cards Ltd | Wholesale & retail | 2024 |
| Hypnosolutions Ltd | Health & social care | 2018 |
| Hytner Exhibitions Limited | Other services | 1993 |
| HZ Car Care Ltd | Wholesale & retail | 2021 |
| I & Car Ltd | Wholesale & retail | 2020 |
| I and a Investments Limited | Extraterritorial | 1996 |
| I D Coupland Ltd | Construction | 2003 |
| I DO 4 YOU Ltd | Construction | 2020 |
| I G Khan PROPCO1 Limited | Construction | 2023 |
| I G Khan PROPCO2 Limited | Construction | 2023 |
| I Glow Clinic Ltd | Other services | 2025 |
| I J Waterworth Ltd | Professional & scientific | 2023 |
| I N G a Service Ltd | Professional & scientific | 2025 |
| I Primary Care Services Limited | Health & social care | 2021 |
| I Shine Professional Cleaners Ltd. | Administrative & support | 2022 |
| I T Windows Ltd | Construction | 2019 |
| I&E Property Limited | Hospitality | 2024 |
| I&G Holdings Limited | Financial services | 2024 |
| I&G Homes Limited | Real estate | 2024 |
| I&J Destin Ltd | Transport & logistics | 2024 |
| I&K Zicka Limited | Wholesale & retail | 2019 |
| I-Cars (Peterborough) Limited | Wholesale & retail | 2016 |
| I-Engage Business Technologies Limited | Information & communication | 2017 |
| I-Lid Design Limited | Construction | 2014 |
| I-Q Auto Centre Limited | Wholesale & retail | 2022 |