| HF Supplies Limited | Wholesale & retail | 2011 |
| HFH Consulting Services Ltd | Construction | 2017 |
| HFL Financial Advisers Ltd | Financial services | 2013 |
| HFM+ Investments Limited | Financial services | 2016 |
| Hfsrc Limited | Wholesale & retail | 2019 |
| Hftrans Ltd | Transport & logistics | 2026 |
| HG Medical Ltd | Health & social care | 2025 |
| HG Shuiwu Limited | Administrative & support | 2020 |
| HG29 Limited | Health & social care | 2024 |
| HGB Limited | Wholesale & retail | 2024 |
| HGM Properties Ltd | Construction | 2021 |
| HGS Properties Ltd | Energy | 2019 |
| HGT Limited | Wholesale & retail | 2025 |
| HGT Precision Fabrication Ltd | Manufacturing | 2024 |
| HGV Auto Parts Ltd | Wholesale & retail | 2023 |
| HH and Spooky Nights Ltd | Administrative & support | 2017 |
| HH Bros Limited | Hospitality | 2025 |
| HH Clinical Aesthetics Ltd | Health & social care | 2018 |
| HH Creative Ltd | Professional & scientific | 2025 |
| HH Support Limited | Other services | 2023 |
| HH Surfacing Limited | Construction | 2021 |
| Hhgt Global Limited | Wholesale & retail | 2022 |
| HHN Limited | Real estate | 2022 |
| HHS Electrical Limited | Construction | 2019 |
| Hhww Services Ltd | Wholesale & retail | 2025 |
| HI FI Racks Limited | Manufacturing | 2004 |
| HI Press Records Ltd | Wholesale & retail | 2025 |
| HI Tech Auto Service LLP | | 2026 |
| HI Tech Security Limited | Manufacturing | 2002 |
| Hi-N-Low Technology Limited | Administrative & support | 2018 |
| Hi-Tech Plumbing & Heating Ltd | Construction | 2020 |
| Hibba Healthcare Limited | Health & social care | 2023 |
| Hibliss Ltd | Wholesale & retail | 2023 |
| Hickling and Squires (Holdings) Ltd | Administrative & support | 2017 |
| Hickling Builders Ltd | Construction | 2017 |
| Hickling Heating Ltd | Construction | 2023 |
| Hickling Neurorehabilitation Company Limited | Health & social care | 2022 |
| Hickman and James Limited | Manufacturing | 2016 |
| Hicky Properties Ltd | Real estate | 2024 |
| Hicloud Accounting Limited | Professional & scientific | 2018 |
| Hicom Ltd | Wholesale & retail | 2020 |
| Hidden Hero 23 Limited | Wholesale & retail | 2023 |
| Hidden One Ltd | Arts & recreation | 2023 |
| Hiddenbrew Coffee Ltd | Hospitality | 2025 |
| Hide Park Leather Co. Limited | Wholesale & retail | 1994 |
| Hideaway Limited | Extraterritorial | 2005 |
| Hideout Records Ltd | Information & communication | 2025 |
| Hiesa Consulting Ltd | Professional & scientific | 2024 |
| Higen Ltd | Wholesale & retail | 2024 |
| Higginson & Woodley Limited | Wholesale & retail | 2024 |
| Higgs Medical Services Limited | Health & social care | 2016 |
| High Calibre Spirits Ltd | Manufacturing | 2024 |
| High Expectations Children’S Homes Consultancy Ltd | Professional & scientific | 2025 |
| High Farm Trading Ltd | Hospitality | 2024 |
| High Fish Limited | Hospitality | 2024 |
| High Growth Coach Ltd | Professional & scientific | 2010 |
| High Horizon Ltd | Extraterritorial | 2022 |
| High Oakham Ridge Estate Management Limited | Real estate | 2026 |
| High Octane Limited | Wholesale & retail | 2018 |
| High Pavement Associates Limited | Professional & scientific | 2019 |
| High Performance Hockey Group Ltd | Education | 2021 |
| High Performing YOU Ltd | Professional & scientific | 2025 |
| High Point Leisure Ltd | Arts & recreation | 2026 |
| High Profile Resourcing Limited | Administrative & support | 2013 |
| High Road Balby Management Company Limited | Households | 2007 |
| High Road Developments Limited | Construction | 2020 |
| High Road Postal Services Limited | Transport & logistics | 2013 |
| High Slade Properties Ltd | Real estate | 2013 |
| High Society Scaffolding Ltd | Construction | 2025 |
| High Specifications Testing Limited | Construction | 2001 |
| High Speed Careers Ltd | Professional & scientific | 2018 |
| High Street Dental Limited | Health & social care | 2015 |
| High Street Funeral Directors Limited | Extraterritorial | 2013 |
| High Street Kebabs House Ltd | Hospitality | 2025 |
| High Summit Scaffolding Ltd | Construction | 2026 |
| High Voltage Hospitality Ltd | Hospitality | 2026 |
| Higham Group Ltd. | Information & communication | 2016 |
| Highbury Design Limited | Manufacturing | 2008 |
| Highbury Investment Capital Limited | Real estate | 2018 |
| Highcroft House Limited | Administrative & support | 2006 |
| Highcroft Portfolio Limited | Real estate | 2026 |
| Highcross Horseboxes Limited | Wholesale & retail | 2016 |
| Highcross Street Holdings Limited | Financial services | 2022 |
| Higher Education Assessment & Development Limited | Education | 2007 |
| Higher Education Policy Institute | Professional & scientific | 2002 |
| Higher Learning C.I.C. | Information & communication | 2024 |
| Higher Planning Ltd | Professional & scientific | 2023 |
| Highfield Golf & Leisure Ltd | Arts & recreation | 2019 |
| Highfield House Investment Properties Limited | Real estate | 2015 |
| Highfield Leisure Limited | Arts & recreation | 1996 |
| Highfield Surveyors Ltd | Professional & scientific | 2020 |
| Highfield Svcs LLP | | 2010 |
| Highland 2000 Limited | Manufacturing | 2000 |
| Highleys Properties Ltd | Real estate | 2024 |
| Highmanor Construction Ltd | Construction | 2006 |
| Highscape Limited | Real estate | 2002 |
| Highstreet Fashion for Less Ltd | Wholesale & retail | 1978 |
| Highview Investments Ltd | Real estate | 2021 |
| Highway Civil Engineering Ltd | Construction | 2019 |
| Highway Contractors Limited | Real estate | 1959 |