| Hansar Properties Ltd | Real estate | 2020 |
| Hanseatic Connect (UK) Limited | Administrative & support | 2024 |
| Hansel Homes Limited | Construction | 2024 |
| Hansel Property Ltd | Construction | 2022 |
| Hansom Game Supplies Ltd | Wholesale & retail | 2016 |
| Hansom Horses Ltd | Agriculture & fishing | 2020 |
| Hanson European Caravan Transport Limited | Transport & logistics | 2006 |
| Hanswood Properties Limited | Real estate | 2025 |
| Hants & Dorset Motor Services Limited | Professional & scientific | 1992 |
| Hants & Dorset Transport Support Services Ltd. | Professional & scientific | 2013 |
| Hants & Dorset Trim Limited | Professional & scientific | 1986 |
| Hanworth House Management Company Limited | Households | 1998 |
| Haowei (NE) Ltd | Hospitality | 2018 |
| Happidave Services Ltd | Health & social care | 2016 |
| Happiest at Home Ltd | Professional & scientific | 2022 |
| Happiness Store Limited | Wholesale & retail | 2010 |
| Happy Days Club Ltd | Health & social care | 2021 |
| Happy Homes Amble Ltd | Construction | 2023 |
| Happy Homes Gateshead Ltd | Real estate | 2023 |
| Happy Homes Newcastle Limited | Real estate | 2023 |
| Happy Homes Norfolk Limited | Other services | 2021 |
| Happy Homes Wallsend Ltd | Construction | 2022 |
| Happy Paws Newcastle Ltd | Other services | 2018 |
| Happy Service (NE) Ltd | Hospitality | 2021 |
| HAQ Property Ltd | Real estate | 2017 |
| Haqqpay Limited | Wholesale & retail | 2024 |
| Haque Consultancy Ltd | Professional & scientific | 2017 |
| HAR Pharm Ltd | Health & social care | 2023 |
| Hara Homes Ltd | Hospitality | 2023 |
| Harbl Limited | Wholesale & retail | 2025 |
| Harborne Tenants Limited | Real estate | 1940 |
| Harcus Consultancy Ltd | Professional & scientific | 2022 |
| Hard Target Limited | Manufacturing | 1996 |
| Harden Invest LP | | 2017 |
| Harden Redstone Company Limited | Mining & quarrying | 1957 |
| Harefang Limited | Financial services | 2021 |
| Hares of Hexham Ltd | Other services | 2017 |
| Harey Campers Ltd | Administrative & support | 2022 |
| Harford Holdings Limited | Administrative & support | 2021 |
| Hargrac Business Utilities Limited | Administrative & support | 2023 |
| Harin a Limited | Wholesale & retail | 2018 |
| Haris & Daughters Ltd | Real estate | 2024 |
| Harker Hair Limited | Other services | 2026 |
| Harlands Finance Limited | Financial services | 1988 |
| Harlands Group Ltd | Financial services | 1994 |
| Harlands Services Ltd | Financial services | 1994 |
| Harlau Holdings Limited | Financial services | 2021 |
| Harlequin Distribution Ltd | Wholesale & retail | 2025 |
| Harley Entertainments Ltd | Arts & recreation | 2022 |
| Harley Street Group Limited | Real estate | 2017 |
| Harlington Limited | Wholesale & retail | 2024 |
| Harlo Land Holdings Limited | Real estate | 2024 |
| Harlo Property Holdings Limited | Real estate | 2022 |
| Harlor Limited | Transport & logistics | 1990 |
| Harmolux Candles Ltd | Manufacturing | 2025 |
| Harmonia Mundi Fine Arts Limited | Professional & scientific | 2024 |
| Harmonix Media Ltd | Information & communication | 2025 |
| Harmony in Horses Community Interest Company | Education | 2024 |
| Harmony Trade Co. Limited | Wholesale & retail | 2025 |
| Harp and Lyre Limited | Wholesale & retail | 2009 |
| Harpenden Orthodontic Care Ltd | Health & social care | 2008 |
| Harper Perry Ltd | Professional & scientific | 2015 |
| Harper Signs Limited | Manufacturing | 1978 |
| Harper Technology Services Ltd | Information & communication | 2025 |
| Harperb Limited | Professional & scientific | 2025 |
| Harpers ( Wetwang ) Limited | Hospitality | 2009 |
| Harpers (Market Weighton) Limited | Hospitality | 2011 |
| Harpers (York 2) Limited | Hospitality | 2010 |
| Harris Twenty One Limited | Professional & scientific | 2019 |
| Harrison Lodge Limited | Households | 2001 |
| Harrison Mechanical Contracting Ltd | Extraterritorial | 2025 |
| Harrison Simm Ltd | Construction | 2023 |
| Harrow Development Management Company Limited | Real estate | 2005 |
| Harry B'S Hair & Beauty Limited | Other services | 2015 |
| Harry Lettings Limited | Real estate | 2024 |
| Harry's Catering Limited | Hospitality | 2013 |
| Harry's Piping Ltd | Professional & scientific | 2025 |
| Harrys Catering Newcastle Ltd | Hospitality | 2024 |
| Harry’S Cafe Lowfell Limited | Hospitality | 2019 |
| Harsav Group Limited | Financial services | 2019 |
| Harsav Limited | Professional & scientific | 2023 |
| Harshitha UK Ltd | Wholesale & retail | 2023 |
| Hart Investment Group Limited | Financial services | 2023 |
| Hartburygrey Developments Ltd | Real estate | 2016 |
| Hartec Consultants Ltd | Professional & scientific | 2024 |
| Hartec Innovations Limited | Information & communication | 2020 |
| Hartec Technologies Limited | Information & communication | 2016 |
| Hartford Green Limited | Real estate | 2026 |
| Hartford Hall Estate 2012 Limited | Real estate | 2012 |
| Hartfound 2012 Limited | Real estate | 2012 |
| Hartington Way Management Company Limited | Real estate | 2017 |
| Hartlaw Holdings Ltd | Transport & logistics | 2021 |
| Hartwood Supply Chain Services Ltd | Professional & scientific | 2024 |
| Harvest and Haven Foods Limited | Wholesale & retail | 2024 |
| Harwood Care Limited | Health & social care | 2024 |
| Harwood House Morpeth Limited | Real estate | 2025 |
| Harwood Locum Services Limited | Health & social care | 2013 |
| Hasa Technologies Limited | Information & communication | 2023 |
| Hasan Building Maintenance Services Ltd | Construction | 2026 |
| Hasan Younis Traders Ltd | Other services | 2025 |