| Halstead Limited | Construction | 1962 |
| Hama Trade Limited | Wholesale & retail | 2025 |
| Hamakang UK Ltd. | Administrative & support | 2015 |
| Hamasa Ltd | Real estate | 2025 |
| Hambleton Plumbing & Heating Limited | Construction | 2022 |
| Hamed Optical Ltd | Health & social care | 2023 |
| Hameed Medical Ltd | Health & social care | 2014 |
| Hameleon Ltd | Wholesale & retail | 2017 |
| Hamid Investments Ltd | Financial services | 2025 |
| Hamiltonn Care UK Ltd | Health & social care | 2016 |
| Hamiltons Supported Living Limited | Health & social care | 2025 |
| Hamir Services Ltd | Wholesale & retail | 2017 |
| Hammad Traders Limited | Wholesale & retail | 2025 |
| Hammden Consulting Ltd | Information & communication | 2015 |
| Hammer Bimmerman Ltd | Wholesale & retail | 2024 |
| Hammond Brothers Limited | Construction | 2015 |
| Hampton Academies Trust | Education | 2014 |
| Hampton Barbers Ltd | Other services | 2010 |
| Hampton Carpets and Flooring Limited | Wholesale & retail | 2005 |
| Hampton Eco Pro Services Ltd | Administrative & support | 2025 |
| Hampton MOT and Services Ltd | Wholesale & retail | 2025 |
| Hampton Nails Ltd | Other services | 2020 |
| Hampton Party&Picnic Solutions Rentals Limited | Administrative & support | 2024 |
| Hampton Retail Ltd | Wholesale & retail | 2024 |
| Hampton Tax Accountants Limited | Professional & scientific | 2019 |
| Hampton Taxis Limited | Transport & logistics | 2025 |
| Hampton Vale Health Limited | Wholesale & retail | 2009 |
| Hamptons Drop Limited | Information & communication | 2026 |
| Hamptons Pizza Plaice Limited | Hospitality | 2026 |
| Hamptons Plaice Private Ltd | Hospitality | 2025 |
| Hamptons Procure Limited | Other services | 2022 |
| Hamptons Spice Limited | Hospitality | 2026 |
| Hamptons Surgical Ltd | Wholesale & retail | 2024 |
| Hamptonshire Car Sales Limited | Wholesale & retail | 2026 |
| Hamsigh Limited | Professional & scientific | 1908 |
| Hamza Locum Ltd | Health & social care | 2021 |
| Hamzu Optical Ltd | Wholesale & retail | 2024 |
| Hanapharma Ltd | Health & social care | 2024 |
| Handai Enterprises Ltd | Real estate | 2020 |
| Handle and Spout Limited | Arts & recreation | 2004 |
| Handum Ltd | Information & communication | 2015 |
| Handy Annie Ltd | Construction | 2025 |
| Handy Tech UK Ltd | Construction | 2012 |
| HANI2 for Export Ltd | Wholesale & retail | 2026 |
| Hania-Trans Ltd | Wholesale & retail | 2019 |
| Hanif Investments Limited | Real estate | 2019 |
| Hanlon Homes & Developments Ltd | Real estate | 2025 |
| Hanmar Limited | Transport & logistics | 2021 |
| Hansa Products UK Ltd | Wholesale & retail | 2023 |
| Hansam Services Limited | Manufacturing | 2004 |
| Hansford Park Management Company Limited | Households | 2019 |
| Hansomride Limited | Transport & logistics | 2026 |
| Hanza Invest Ltd. | Information & communication | 2015 |
| Hanzo Trading Limited | Wholesale & retail | 2025 |
| Hapi Hemp Limited | Wholesale & retail | 2019 |
| Hapi Patch Ltd | Wholesale & retail | 2025 |
| Happier Hands Limited | Manufacturing | 2020 |
| Happy Cakes Limited | Manufacturing | 2005 |
| Happy Dayz Consultancy Limited | Professional & scientific | 2017 |
| Happy Faces (UK) Limited | Health & social care | 2013 |
| Happy Kids Emporium Ltd | Other services | 2023 |
| Happy Motorhome Hire Ltd | Administrative & support | 2022 |
| Happy Paws Paddock Limited | Other services | 2026 |
| Happy Valley Peterborough Ltd | Hospitality | 2018 |
| Happysolutionz Ltd | Extraterritorial | 2022 |
| Haqua Ltd | Wholesale & retail | 2018 |
| Harambe Arts Ltd | Education | 2026 |
| Harbour Eats Ltd | Information & communication | 2024 |
| Harbour Technologies Limited | Information & communication | 2022 |
| Hard Hats Heroes Ltd | Construction | 2025 |
| Hard to Insure Limited | Financial services | 2011 |
| Hard to Resist Limited | Financial services | 2008 |
| Harden Care Services Ltd | Health & social care | 2026 |
| Hardline Security Solutions Ltd | Administrative & support | 2025 |
| Hardway Investments Limited | Households | 2021 |
| Hare Krishna IT Ltd | Information & communication | 2022 |
| Haremere Ltd | Extraterritorial | 2022 |
| Haremere Properties Ltd | Construction | 2022 |
| Haribay Ltd | Manufacturing | 2021 |
| Haris Value Store Ltd | Wholesale & retail | 2025 |
| Harling's Autos Limited | Wholesale & retail | 2015 |
| Harlock Enterprises Limited | Professional & scientific | 2024 |
| Harmaven Cleaning Ltd | Administrative & support | 2026 |
| HARMONEY79 Ltd | Transport & logistics | 2021 |
| Harmony Bedford Ltd | Other services | 2020 |
| Harmony Electrical Limited | Construction | 2017 |
| Harmony Support Solutions Ltd | Health & social care | 2024 |
| Harn Road RTM Company Limited | Households | 2023 |
| Harper Family Holdings Limited | Financial services | 2023 |
| Harper Leadership Limited | Professional & scientific | 2026 |
| Harpscot Group Limited | Real estate | 2024 |
| Harrier Global Limited | Administrative & support | 2017 |
| Harriers Rest Residents Management Company Limited | Households | 2020 |
| Harriet Sale Ltd | Professional & scientific | 2021 |
| Harris Building Projects Limited | Construction | 2020 |
| Harris Mccormack Architects Limited | Professional & scientific | 2016 |
| Harris Mccormack Holdings Limited | Professional & scientific | 2010 |
| Harrison & Thomas Property Services Limited | Households | 2008 |
| Harrison Community Ventures Ltd | Other services | 2019 |
| Harrison Financials Ltd | Professional & scientific | 2016 |