| Hives Save Lives - Africa | Health & social care | 2003 |
| HJ Compliance Ltd | Health & social care | 2022 |
| HJ Game Design Ltd | Professional & scientific | 2024 |
| HJB Invest Co. Ltd | Financial services | 2000 |
| HJG Commercial Management Limited | Construction | 2020 |
| HK Financial Advice Service Limited | Administrative & support | 2005 |
| HKG Services Ltd | Information & communication | 2013 |
| HLX Performance Ltd | Wholesale & retail | 2024 |
| HLX Prestige Ltd | Wholesale & retail | 2026 |
| HML Education Limited | Education | 2020 |
| HMR Care Limited | Administrative & support | 2022 |
| HN Elite Consulting Ltd | Information & communication | 2015 |
| Hoba Consulting Limited | Information & communication | 2025 |
| Hobbs Hotel Ltd | Hospitality | 2023 |
| Hoben Decking Specialists Ltd | Construction | 2021 |
| Hoben Solar Ltd | Construction | 2024 |
| Hoblai Limited | Energy | 2022 |
| Hobson Advisory Services Ltd | Professional & scientific | 2024 |
| HOE Cross Fields Limited | Real estate | 2025 |
| Holes Bay Marine Limited | Manufacturing | 1999 |
| Holger Limited | Information & communication | 1998 |
| Holistic Enterprise Architecture Solutions Services Limited | Information & communication | 2024 |
| Holland Business Park Service Charge Limited | Administrative & support | 2024 |
| Holland Enterprise Park Management Company Limited | Households | 2023 |
| Holley Consulting Ltd | Information & communication | 2023 |
| Hollier Homes CIC | Real estate | 2026 |
| Hollyhurst Investments LLP | | 2016 |
| Hollywood Engineering Limited | Professional & scientific | 2022 |
| Holmleigh Consulting Ltd | Information & communication | 2019 |
| Holonic Solutions Ltd | Professional & scientific | 2024 |
| Holt Plumbing + Heating Service Limited | Construction | 2017 |
| Holtwood Holdings Ltd | Financial services | 2026 |
| HOMEHELP4U Cleaning Services Ltd | Administrative & support | 2021 |
| HOMEHELP4U Limited | Households | 2019 |
| Homelands Leisure Limited | Other services | 1990 |
| Homestead Close Management Company Ltd | Households | 2019 |
| Honey BEE Bereavement Support Limited | Other services | 2023 |
| Hopby Safety Engineering Ltd | Professional & scientific | 2026 |
| Hope Lodge (Management) Limited | Households | 1959 |
| Hopestrand Limited | Information & communication | 2011 |
| Hopps Holdings Limited | Real estate | 2023 |
| Horizon Countrywide Ltd | Hospitality | 2018 |
| Horizon Data Solutions Limited | Information & communication | 2022 |
| Horizon Hill Holdings Ltd | Education | 2016 |
| Horseshoe Construction and Consultancy Ltd | Administrative & support | 2026 |
| Horsham Bowl Management Limited | Arts & recreation | 2014 |
| Horsham Software Services Ltd | Information & communication | 2025 |
| Horton Commercials Limited | Wholesale & retail | 1998 |
| Horton Developments (Wessex) Ltd | Professional & scientific | 2013 |
| Horton Fields Management Limited | Households | 2007 |
| Horton Golf Limited | Arts & recreation | 2004 |
| Horton Heights Ltd | Construction | 2025 |
| Horton Property Portfolio Ltd | Real estate | 2017 |
| Hosted Remotely Ltd | Hospitality | 2018 |
| Hot Tequila Limited | Information & communication | 2025 |
| Hoteleus UK Ltd | Wholesale & retail | 2020 |
| House of Sonnaz Limited | Manufacturing | 2015 |
| Houseturn Limited | Real estate | 2025 |
| Howard Consultancy Limited | Administrative & support | 2000 |
| Howard Montrose Consulting Ltd | Professional & scientific | 2017 |
| Howard Warwick Developments Limited | Construction | 2003 |
| Howlen Digital Ltd | Information & communication | 2022 |
| Howler Global Ltd | Manufacturing | 2015 |
| Hphs Holdings Limited | Financial services | 2025 |
| Hpln Ltd | Professional & scientific | 2025 |
| Hrms Consulting Limited | Information & communication | 2007 |
| HS Bourne Ltd | Real estate | 2021 |
| HS HR Services Limited | Administrative & support | 2018 |
| HSK Property Holdings Limited | Real estate | 2023 |
| Hsquaredadvisory Limited | Professional & scientific | 2025 |
| Hsre Ltd | Real estate | 2023 |
| HT Engineering Limited | Information & communication | 2018 |
| HTC Building Contractors Limited | Construction | 2014 |
| Huashun Limited | Administrative & support | 2014 |
| Hub Interiors Ltd | Wholesale & retail | 2021 |
| Hudson Fintech Limited | Information & communication | 2019 |
| Huggerup Limited | Professional & scientific | 2013 |
| Human and Machine Ltd | Professional & scientific | 2017 |
| Human Scale Architects Ltd | Professional & scientific | 2017 |
| Human Sense Limited | Professional & scientific | 2023 |
| Humanegic Ltd | Administrative & support | 2022 |
| Humble Credibility Limited | Professional & scientific | 2024 |
| Humility Hub Limited | Professional & scientific | 2024 |
| Hunt and Mock Data Consultancy Limited | Information & communication | 2026 |
| Hunterwood Heating & Plumbing Ltd | Construction | 2023 |
| Huntley Design Solutions Ltd | Professional & scientific | 2016 |
| Huntley Down Management Company Limited | Households | 2021 |
| Hurst House Collective Limited | Information & communication | 2024 |
| Huski Limited | Administrative & support | 2003 |
| Huz&Ayish Ltd | Real estate | 2020 |
| Hyarc Advisors Ltd | Professional & scientific | 2022 |
| Hydenlyne Group Limited | Financial services | 2024 |
| Hydenlyne Limited | Mining & quarrying | 2013 |
| Hydenlyne Projects Limited | Mining & quarrying | 2013 |
| Hydenlyne Properties Limited | Construction | 2024 |
| Hydro-Gen Limited | Professional & scientific | 1991 |
| Hydroplan Group Limited | Extraterritorial | 2021 |
| Hydroplan Investments UK Limited | Financial services | 2016 |
| Hydroplan Ltd | Professional & scientific | 2021 |
| Hydroplan Operations Limited | Professional & scientific | 2016 |