| Hartback Limited | Administrative & support | 2025 |
| Harte Property Developments Limited | Real estate | 2020 |
| Hartie Holdings Limited | Real estate | 2021 |
| Hartill Surveys Ltd | Professional & scientific | 2010 |
| Hartley Support Solutions Ltd. | Professional & scientific | 2016 |
| Hartmere Limited | Real estate | 2021 |
| Harts Hucknall (Holdings) Limited | Financial services | 2024 |
| Harts Hucknall Limited | Wholesale & retail | 2023 |
| Hartshorn Analytics Ltd | Professional & scientific | 2018 |
| Hartshorne Residents Management Company Limited | Households | 2019 |
| Harvey & Brockless Limited | Wholesale & retail | 1979 |
| Harvey & Coombes Limited | Construction | 2009 |
| Harvey & Robinson Limited | Financial services | 1966 |
| Harvey & Sons Prestige Property Solutions Ltd | Real estate | 2024 |
| Harvey & Sons Property Solutions Ltd | Real estate | 2024 |
| Harvey Contractors Limited | Construction | 2024 |
| Harvey Parker Ltd | Wholesale & retail | 2011 |
| Harvey Project Services Limited | Professional & scientific | 2013 |
| Harvey Quilting Limited | Administrative & support | 1999 |
| Harveys (Nottingham) Limited | Real estate | 1995 |
| Harvington Holdings Limited | Financial services | 2018 |
| Hary Cleaning Ltd | Administrative & support | 2024 |
| HAS Group PVT Ltd | Information & communication | 2025 |
| HAS Property Holdings Ltd | Real estate | 2025 |
| Haseeb UK Ltd | Wholesale & retail | 2010 |
| Hashq Limited | Health & social care | 2019 |
| Haskell & Co. Limited | Administrative & support | 2002 |
| Hassall & Lucking,Limited | Manufacturing | 1935 |
| Hastings Bray Developments Limited | Construction | 2024 |
| Hastings Bray Rentals Limited | Real estate | 2024 |
| Hastings Bray Winn Street Limited | Real estate | 2025 |
| Hatchers Properties Ltd | Real estate | 2018 |
| Hatfields Garages Limited | Wholesale & retail | 1991 |
| Hatha Ltd | Other services | 2015 |
| Hatherdown (1991) Limited | Extraterritorial | 1977 |
| Hats Holding Ltd | Real estate | 2025 |
| Hatsukoi Ltd | Wholesale & retail | 2023 |
| Hattersley Heaton Limited | Financial services | 2022 |
| Hattle & Green Ltd | Financial services | 2018 |
| Haukorder Limited | Wholesale & retail | 2020 |
| Haunted Happenings Ltd | Administrative & support | 2008 |
| Haus Developer Ltd | Construction | 2024 |
| Haus of Flava Ltd | Hospitality | 2023 |
| Haus of Hair by Sarah Shakespeare Ltd | Other services | 2024 |
| Hausbuild Limited | Construction | 2013 |
| Hauxsaur Ltd | Construction | 2025 |
| Havana House 9 Ltd | Households | 2024 |
| Havara Capital Limited | Professional & scientific | 2026 |
| Haven Funeral Services Limited | Extraterritorial | 2011 |
| Haven Health Limited | Real estate | 2025 |
| Haven Property Investments Ltd | Real estate | 2021 |
| Haven Respite Ltd | Health & social care | 2025 |
| Haven Risk Management Services Ltd. | Professional & scientific | 2015 |
| HAVEN2HAVEN Homes Ltd | Hospitality | 2024 |
| Havenbranch Estates Ltd | Real estate | 2025 |
| Havenbridge Childrens Homes Ltd | Health & social care | 2025 |
| Havenbridge Group Ltd | Financial services | 2025 |
| Havenbridge Properties Ltd | Real estate | 2025 |
| Havento Ltd | Real estate | 2025 |
| Havenwood Signs the Neon Workshop Limited | Manufacturing | 1999 |
| Haviland Limited | Manufacturing | 2001 |
| Haviland Project Management & Renovations Ltd | Construction | 2026 |
| Havill Fibre Solutions Limited | Construction | 2018 |
| Havishe Ltd | Real estate | 2023 |
| Havy Barbers 92 Ltd | Other services | 2026 |
| Havy Barbershop Ltd | Other services | 2025 |
| Hawd Investments Limited | Real estate | 2024 |
| Hawd Medical Limited | Health & social care | 2023 |
| Hawdin Ltd | Wholesale & retail | 2025 |
| Hawkbrothers Ltd | Wholesale & retail | 2024 |
| Hawke Living Ltd | Construction | 2019 |
| Hawkes Web Design Ltd | Information & communication | 2020 |
| Hawkesmoor Limited | Manufacturing | 1953 |
| Hawkins Family LLP | | 2024 |
| Hawkins Tyres Ltd | Wholesale & retail | 2025 |
| Hawkridge Electrical Limited | Construction | 2015 |
| Hawksbury Holdings Limited | Financial services | 2020 |
| Hawksbury House Limited | Health & social care | 2015 |
| Hawksley Grange Management Company Limited | Households | 2026 |
| Hawksley Hallam Ltd | Professional & scientific | 2026 |
| Hawley Electrical Limited | Construction | 2014 |
| Hawley Roofing Ltd | Construction | 2023 |
| Hawn Store Limited | Extraterritorial | 2025 |
| Hawthorn Gate Limited | Real estate | 2026 |
| Hawthorne Court Management Co. Ltd | Real estate | 1997 |
| Hawthorne Court Management Company (Long Eaton) Limited | Households | 2004 |
| Hawthornes 2011 Management Limited | Households | 2011 |
| Hawton Carpentry Ltd | Administrative & support | 2024 |
| HAY Spoon & Honey Ltd | Agriculture & fishing | 2025 |
| Hayati Convenience Ltd | Wholesale & retail | 2025 |
| Haych Care Homes Ltd | Health & social care | 2017 |
| Haych Homes Ltd | Health & social care | 2016 |
| Hayden Scrap Ltd | Professional & scientific | 2021 |
| Haydn Road Property Management Company Limited | Households | 2003 |
| Haydn Road RTM Ltd | Households | 2023 |
| Haye Independent Services Ltd | Education | 2014 |
| Hayer 5K Estates Ltd | Real estate | 2024 |
| Hayer Holdings Limited | Real estate | 2007 |
| Hayer Limited | Information & communication | 2004 |
| Hayerhomes Ltd | Real estate | 2019 |