| Hanna Letting & Travel Ltd | Real estate | 2020 |
| Hannah Care Services Limited | Health & social care | 2023 |
| Hannah Estates Limited | Real estate | 2025 |
| Hannah Lewis Consulting Ltd | Wholesale & retail | 2025 |
| Hannah Lewis Styling Ltd | Professional & scientific | 2026 |
| Hannah Lownsbrough Limited | Professional & scientific | 2025 |
| Hannah Nails 68 Ltd | Other services | 2022 |
| Hannah Rose Entertainment Ltd | Arts & recreation | 2025 |
| Hannah Taylor Bridal Hair Limited | Other services | 2022 |
| Hannah Taylor Training Limited | Other services | 2022 |
| Hannity Digital Designs Ltd | Information & communication | 2020 |
| Hannover Social Ltd | Hospitality | 2026 |
| Hanse Consulting Ltd | Professional & scientific | 1995 |
| Hanson's Carpets Limited | Wholesale & retail | 2006 |
| HANSON33 Ltd | Hospitality | 2018 |
| Hanter Limited | Professional & scientific | 2025 |
| Hanu Software Solutions UK Limited | Information & communication | 2021 |
| Hanver Technical Ltd | Administrative & support | 2011 |
| Hanz Civil Engineering Limited | Professional & scientific | 2018 |
| Hanzen Security Solutions Limited | Administrative & support | 2025 |
| Haoltk Limited | Extraterritorial | 2021 |
| Hapi Technology Limited | Information & communication | 2019 |
| HAPPINESS666 Limited | Hospitality | 2020 |
| Happy Architects Ltd | Professional & scientific | 2025 |
| Happy CBD OIL Ltd | Wholesale & retail | 2019 |
| Happy Days Accountants Limited | Professional & scientific | 2014 |
| Happy Days Cards Limited | Wholesale & retail | 2013 |
| Happy Days Daycare Services Limited | Health & social care | 2013 |
| Happy Days Hire Limited | Administrative & support | 2013 |
| Happy Emotions Ltd | Professional & scientific | 2021 |
| Happy Feelings Limited | Administrative & support | 2012 |
| Happy Game Ltd | Wholesale & retail | 2025 |
| Happy Grazing Limited | Real estate | 2020 |
| Happy Hopperz Soft Play Hire Ltd | Administrative & support | 2026 |
| Happy House (Wang) Limited | Hospitality | 2023 |
| Happy House and Homes Limited | Real estate | 2019 |
| Happy Kids (Yorkshire) Limited | Education | 2013 |
| Happy Kids Childcare Limited | Education | 2012 |
| Happy Lemon Sheffield Ltd | Hospitality | 2023 |
| Happy Swipe Limited | Administrative & support | 2012 |
| Happy Trader Limited | Wholesale & retail | 2019 |
| Happy Tramp Limited | Information & communication | 2012 |
| HAPPY1234 Ltd | Wholesale & retail | 2025 |
| Happydent Teeth UK Ltd | Health & social care | 2025 |
| Haran Joinery & Construction Ltd | Construction | 2023 |
| Haran Property Limited | Real estate | 2025 |
| Harappa Tech Tower UK Limited | Information & communication | 2022 |
| Harard Developments (Penistone) Ltd | Real estate | 2006 |
| Harborstone Properties Limited | Real estate | 2025 |
| Harcourt Services Limited | Information & communication | 2026 |
| Harcourt Systems Limited | Information & communication | 2026 |
| Hard Lane Fish Bar Ltd | Wholesale & retail | 2020 |
| Hard Rock Mining Limited | Mining & quarrying | 2016 |
| Hardacre Consulting Ltd | Professional & scientific | 2014 |
| Hardcastle Properties Ltd | Real estate | 2020 |
| Hardcores Building & Paving Supplies Limited | Wholesale & retail | 2003 |
| Hardies Mustard Ltd | Manufacturing | 2026 |
| Hardings Specialist Fiber Ltd | Manufacturing | 2022 |
| Hardline Properties Limited | Construction | 2008 |
| Hardman Fitness Ltd | Education | 2024 |
| Hardwire Electrical Services Ltd | Construction | 2023 |
| Hardworking Investments Limited | Wholesale & retail | 2019 |
| Hardworking Investments SK Limited | Wholesale & retail | 2024 |
| Hardy - U.K. Limited | Manufacturing | 1990 |
| Hardy and Hanson Limited | Manufacturing | 1949 |
| Hardy Brown's Lock Stock & Barrel Limited | Arts & recreation | 2021 |
| Hardy Decorators Limited | Construction | 1999 |
| Hardy Healthcare Limited | Health & social care | 2013 |
| Hardy Property Limited | Real estate | 2022 |
| Hardy Transaction Management Limited | Professional & scientific | 2003 |
| Hare on the Park Ltd | Other services | 2017 |
| Haredon Developments Limited | Extraterritorial | 1963 |
| Haresh Ltd | Wholesale & retail | 2025 |
| Harewood (Viper Rooms) Limited | Hospitality | 2011 |
| Harewood Ginnel Limited | Hospitality | 2024 |
| Harewood Group Admin Services Limited | Professional & scientific | 2026 |
| Harewood Group Limited | Hospitality | 2015 |
| Harewood Solutions Limited | Construction | 2013 |
| Hargate Ventures LLP | | 2024 |
| Hargrave Bidco Ltd | Other services | 2025 |
| Hargrave Performance Ltd | Education | 2025 |
| Hargrave Topco Ltd | Financial services | 2025 |
| Hari Karan Ltd | Wholesale & retail | 2020 |
| Harjak Limited | Extraterritorial | 1973 |
| Hark to Dandler Limited | Hospitality | 2025 |
| Harkaye Core Talent Limited | Administrative & support | 2025 |
| Harkly Ltd | Information & communication | 2026 |
| Harland and Sons Ltd | Construction | 2018 |
| Harland Bikes Ltd | Manufacturing | 2025 |
| Harland Blinds Ltd | Wholesale & retail | 2011 |
| Harlem House Distribution & Wholesale Ltd | Wholesale & retail | 2026 |
| Harlem House Limited | Hospitality | 2022 |
| Harlem House S2 Ltd | Hospitality | 2025 |
| Harley House Day Care Ltd | Health & social care | 2024 |
| Harley Private Dental Limited | Health & social care | 2020 |
| Harley’S Motors Ltd | Wholesale & retail | 2026 |
| Harman Designs Ltd | Wholesale & retail | 2020 |
| Harmelia Aesthetics Ltd | Health & social care | 2025 |
| Harmelia Limited | Real estate | 2025 |
| Harmer Healey Ltd | Financial services | 1949 |