| Hazelwood Beauty Ltd | Other services | 2015 |
| Hazelwood IT Consultancy Ltd | Information & communication | 2024 |
| Hazlecote Properties Limited | Real estate | 2023 |
| Hbcompany Limited | Wholesale & retail | 2026 |
| Hbcreative Limited | Other services | 2026 |
| HBR Construction Ltd | Construction | 2021 |
| HC Software Services Ltd | Information & communication | 2025 |
| Hcfa Investments Limited | Financial services | 2023 |
| Hcompanyone Limited | Administrative & support | 2007 |
| Hcompanytwo Limited | Administrative & support | 2007 |
| Hcsc Engineering Limited | Information & communication | 2018 |
| HE Interiors Ltd | Construction | 2020 |
| Healthhero Integrated Care Limited | Health & social care | 2004 |
| Heather Thomas - Behavioural Consultant and Business Coach Limited | Other services | 2019 |
| Heather's Pet Services Ltd | Other services | 2013 |
| HEC Horizon Properties Ltd | Real estate | 2026 |
| Hedgemead Court Management Company Limited | Real estate | 1983 |
| Hedgerow Drinks Ltd | Manufacturing | 2024 |
| Hedonic Freehold Investments Ltd | Real estate | 2025 |
| Hedonic Group Ltd | Financial services | 2026 |
| Heirloom and Howard Limited | Professional & scientific | 1973 |
| Helioeast UK Limited | Other services | 2020 |
| Hello, I'M Martin Ltd | Professional & scientific | 2024 |
| HEMIV8 Ltd | Professional & scientific | 2016 |
| Henberg Financial Solutions Ltd | Financial services | 2019 |
| Hengo Ltd | Administrative & support | 2025 |
| Henry & Tosh Limited | Information & communication | 2019 |
| Henry Green Ltd | Information & communication | 2019 |
| Henry Williamson Limited | Extraterritorial | 2024 |
| Herbert Road Property Consultants Ltd | Professional & scientific | 2024 |
| Hercules View Management Company Limited | Households | 2019 |
| Heritage Planning Services Ltd | Professional & scientific | 2015 |
| Herumo Ltd | Professional & scientific | 2017 |
| Hestia Communications Limited | Professional & scientific | 2020 |
| Hewitt-Barnes Consulting Ltd | Wholesale & retail | 2020 |
| HEX Collective Ltd | Information & communication | 2010 |
| Hexagon PCB Design Services Ltd | Manufacturing | 2014 |
| Hexagonal Property Ltd | Real estate | 2018 |
| Heys of Chippenham Ltd | Other services | 2015 |
| Heywood Private Advisory Ltd | Professional & scientific | 2026 |
| HGE Properties (Yorkshire) Limited | Real estate | 2017 |
| HHC Nails Limited | Other services | 2020 |
| Hidden Collective Ltd | Arts & recreation | 2014 |
| High Larches Limited | Real estate | 1970 |
| Highland Stays Ltd | Households | 2025 |
| Higman Consulting UK Limited | Professional & scientific | 2018 |
| Hildare Stud Farm Limited | Agriculture & fishing | 2020 |
| Hillier Builders Limited | Construction | 2004 |
| Hillside Equestrian Services Limited | Other services | 2011 |
| Hillside Technical Services Limited | Extraterritorial | 2011 |
| Hilltop Creative Ltd | Information & communication | 2015 |
| Hilltop Language & Creative Ltd | Administrative & support | 2010 |
| Hire a Hand Limited | Professional & scientific | 2007 |
| Hitch & Haul Transport & Recovery Services Ltd | Transport & logistics | 2025 |
| Hitchings Skilling Limited | Households | 2018 |
| Hither Holdings Ltd | Real estate | 2016 |
| Hive Building and Property Maintenance Ltd | Construction | 2021 |
| HJ Stott Ltd | Health & social care | 2025 |
| HJW Limited | Construction | 2025 |
| Hlmt Ltd | Information & communication | 2015 |
| HMH Contracting Ltd | Construction | 2012 |
| Hoagys Roofing & Homecare Ltd | Construction | 2016 |
| Hobbs House Mortgages Ltd | Financial services | 2023 |
| HOC Inc Ltd | Wholesale & retail | 2023 |
| Hoja Fabrications Ltd | Construction | 2018 |
| Holato Limited | Information & communication | 2022 |
| Holbrook Park Associates Limited | Professional & scientific | 2019 |
| Holder Contractors Limited | Agriculture & fishing | 2000 |
| Holdfast Security Ltd | Administrative & support | 2026 |
| Holistic VET Ltd | Professional & scientific | 2002 |
| Holland’S Homes Ltd | Real estate | 2019 |
| Hollow North Limited | Information & communication | 2025 |
| Holman Fleet Limited | Wholesale & retail | 1987 |
| Holman Holdings Europe Limited | Wholesale & retail | 2011 |
| Holmes Morgan Limited | Professional & scientific | 2002 |
| Home Farm Stables Owners (Marshfield) Management Company Ltd | Households | 2019 |
| Homesfield Developments Limited | Construction | 2018 |
| Homesmith Campers Ltd | Manufacturing | 2023 |
| Homoeopathy at Wellie Level | Education | 2009 |
| Honeydell Holdings Ltd | Financial services | 2021 |
| Hontan Holdings Limited | Financial services | 2020 |
| Hoova Limited | Arts & recreation | 2026 |
| Hope Blamire Ltd | Arts & recreation | 2021 |
| Horizon Investments Wiltshire Limited | Real estate | 2018 |
| Hornblower Group Ltd | Financial services | 2021 |
| Horton Wolfe Limited | Information & communication | 2010 |
| Hostarium Ltd | Information & communication | 2019 |
| Houdengale Limited | Hospitality | 2024 |
| House Consulting Ltd | Administrative & support | 2018 |
| HOW NOW Marketing Limited | Professional & scientific | 2009 |
| Howard & Farah Co. Ltd | Construction | 2024 |
| Howard & Sons Exports Limited | Wholesale & retail | 2001 |
| Howard and Sons Holdings Ltd | Financial services | 2016 |
| Howard Roofing & Sons Ltd | Construction | 2024 |
| HS Sports Camps Limited | Arts & recreation | 2022 |
| Huber UK & Ireland Limited | Wholesale & retail | 1993 |
| Hughes and Hughes Estate Agents Ltd | Real estate | 2016 |
| Huishcraft Services Ltd | Professional & scientific | 2026 |
| Human Milk Clothing Ltd | Wholesale & retail | 2022 |
| Humanly Project Limited | Information & communication | 2025 |