| Hollybank Nursery Limited | Agriculture & fishing | 2014 |
| Hollyberry Limited | Real estate | 2001 |
| Hollygate Limited | Households | 1965 |
| Hollyparc Properties Limited | Real estate | 2005 |
| Holmwood Management Limited | Real estate | 1994 |
| Holt Company Holdings Ltd | Financial services | 2016 |
| Holts Hampshire Limited | Construction | 2024 |
| Home + Future Limited | Health & social care | 2025 |
| Home and Energy Surveys Ltd | Professional & scientific | 2014 |
| Home Appliance TV Care Ltd | Administrative & support | 2016 |
| Home Check UK 2022 Ltd | Construction | 2022 |
| Home Edit Pro Ltd | Other services | 2025 |
| Home Fire Logs Ltd | Agriculture & fishing | 2013 |
| Home-Start Chichester & District | Health & social care | 2008 |
| Homeproud Limited | Administrative & support | 2024 |
| Honestbuilding Ltd | Construction | 2025 |
| Honey BEE Doverdale Limited | Hospitality | 2025 |
| Honey Home Property Services Ltd | Real estate | 2026 |
| Honu Solutions Limited | Information & communication | 2008 |
| Hope Plants Ltd | Wholesale & retail | 2020 |
| Hopedene Court Management Company Limited | Households | 1973 |
| Hopsbox Limited | Extraterritorial | 2014 |
| Horizon Acquisitions Ltd | Professional & scientific | 2025 |
| Hornet (Flat Management) Limited | Households | 1977 |
| Hornet News Ltd | Wholesale & retail | 2017 |
| Hornsey Property Ltd | Real estate | 2024 |
| Horrocks Limited | Wholesale & retail | 2003 |
| Horse Confidence Coaching Ltd | Other services | 2017 |
| Horse Straights Direct Limited | Wholesale & retail | 2023 |
| Horsebox Coffee Company Ltd | Hospitality | 2026 |
| Hortisurve Limited | Administrative & support | 2006 |
| Horton Park Golf Club Limited | Arts & recreation | 2009 |
| Horus Heating Ltd | Construction | 2019 |
| Hose and General Supplies Limited | Wholesale & retail | 1989 |
| Hoskins Structures and Conservation Limited | Professional & scientific | 2020 |
| Hossain Corporation Ltd | Wholesale & retail | 2025 |
| Host and Hire Ltd | Administrative & support | 2025 |
| Hot N Cold Ltd | Other services | 2026 |
| Hotchpotch Publishing Limited | Manufacturing | 1995 |
| Hotensify Limited | Information & communication | 2019 |
| Hougun Solutions Ltd | Administrative & support | 2023 |
| Hound Capital Ltd | Real estate | 2023 |
| Hounslow Heath Golf Centre Ltd | Arts & recreation | 2015 |
| Household Service Group Ltd | Other services | 2020 |
| Houston Family Ltd | Real estate | 2016 |
| Hovr Web Ltd | Information & communication | 2011 |
| HOW2 Consultancy Ltd | Information & communication | 2019 |
| Hownhall Shooting Limited | Arts & recreation | 2016 |
| Howson Properties Ltd | Real estate | 2026 |
| HR Concepts Limited | Extraterritorial | 2010 |
| HSM Decorators Limited | Administrative & support | 2015 |
| HT Advertising Ltd | Professional & scientific | 2024 |
| Htds Welding & Fabrication Ltd | Manufacturing | 2022 |
| HU Bay Ltd | Hospitality | 2024 |
| Hubble Constantine Ltd | Manufacturing | 2004 |
| Hucon Limited | Health & social care | 2009 |
| Hudson and Reeve Limited | Extraterritorial | 2016 |
| Hudson Grips Limited | Information & communication | 2025 |
| Hudson Ware Holdings Limited | Financial services | 2022 |
| Hughes Movie Supplies Limited | Administrative & support | 2012 |
| Hulse Associates Ltd. | Real estate | 2017 |
| Humaniise Group Limited | Financial services | 2017 |
| Humaniise IT Limited | Extraterritorial | 2017 |
| Humaniise Limited | Information & communication | 2017 |
| Humankindness Limited | Professional & scientific | 2025 |
| Humantum Limited | Information & communication | 2025 |
| Humdinger Solutions Limited | Administrative & support | 2018 |
| Humilis Amprofi Ltd | Health & social care | 2025 |
| Humphrey Clarke Consultants Limited | Administrative & support | 2002 |
| Humphrey Place Freehold Limited | Households | 2022 |
| Hunston Business Park Limited | Real estate | 2015 |
| Hunston Mill Cottages Limited | Hospitality | 2011 |
| Hunte Ltd | Information & communication | 2019 |
| Hunter Dunning Limited | Administrative & support | 2004 |
| Hunter Embedded Limited | Professional & scientific | 2017 |
| Hunter Hardy Limited | Administrative & support | 2018 |
| Hunter Laundries Ltd | Other services | 2024 |
| Hunter Marine Services Ltd | Manufacturing | 2023 |
| Hunter Spirit Ltd | Wholesale & retail | 2020 |
| Hunts Garden Company Ltd | Administrative & support | 2025 |
| Hurfords Estates Limited | Real estate | 2010 |
| Huska Limited | Wholesale & retail | 2017 |
| Hutchings Ltd | Professional & scientific | 2015 |
| Hutchison Holdings Ltd | Real estate | 2019 |
| Hutton Faux Flowers Limited | Arts & recreation | 2021 |
| Hutton Park Innovations Limited | Manufacturing | 2025 |
| Huttoncore Construction Ltd | Construction | 2025 |
| Huxley Productions Ltd | Information & communication | 2014 |
| HV Building & Carpentry Ltd | Construction | 2023 |
| HV Cable System Consultant Ltd | Professional & scientific | 2026 |
| Hyde and Grace Ltd | Other services | 2025 |
| Hydraulic Engineering Consulting and Supply Limited | Professional & scientific | 2011 |
| Hydro Wizard Ltd | Agriculture & fishing | 2019 |
| Hygienic Cladding Projects Limited | Construction | 2021 |
| Hyglo Ltd | Wholesale & retail | 2024 |
| I & K Friend Consulting Ltd | Professional & scientific | 2021 |
| I Depend on ME Limited | Education | 2022 |
| I G Developments South Coast Limited | Construction | 2023 |
| I M Projects Limited | Professional & scientific | 2004 |
| I-Laundry Limited | Administrative & support | 2020 |