| HEX Family Ltd | Information & communication | 2026 |
| HEX Limited | Information & communication | 2026 |
| Hexcaria Ltd | Information & communication | 2025 |
| Hexo Ltd | Professional & scientific | 2021 |
| Hextave Games Ltd | Information & communication | 2026 |
| Heylinsmith Ltd | Professional & scientific | 2018 |
| Heylo Care Limited | Administrative & support | 2019 |
| Heyshi Trading Limited | Hospitality | 2025 |
| Heywood Homes UK Limited | Construction | 2005 |
| HF Architecture Limited | Professional & scientific | 2004 |
| HF Industries Global Limited | Administrative & support | 2018 |
| HF Partners Limited | Real estate | 2021 |
| HFM Healthcare Limited | Health & social care | 2013 |
| HGH Sahota Ltd | Real estate | 2026 |
| HGI Home Ltd | Real estate | 2020 |
| HGV Cleaning Ltd | Administrative & support | 2025 |
| HGV Logistics Solutions Ltd | Transport & logistics | 2016 |
| HH & Sons Properties Limited | Real estate | 2021 |
| HH Contracts Ltd | Construction | 2012 |
| HH Interco Ltd | Wholesale & retail | 2025 |
| HH Scaffolding Ltd | Construction | 2020 |
| HHC Lewis Limited | Professional & scientific | 1995 |
| HHH Corporations Limited | Administrative & support | 2017 |
| Hhmh Investments Limited | Real estate | 2019 |
| Hhonest Pubs Ltd | Hospitality | 2026 |
| HHR Performance Ltd | Wholesale & retail | 2017 |
| Hi&Pe Limited | Manufacturing | 2015 |
| Hi-Bar Cleaners Limited | Manufacturing | 1998 |
| Hi-Grade Cleaning Services Limited | Administrative & support | 1974 |
| Hi-Grade Installations Limited | Construction | 2001 |
| Hibirefresh Hibiscus Drink Ltd | Manufacturing | 2025 |
| Hicks & Co Limited | Wholesale & retail | 2012 |
| Hidden Agenda Lingerie Ltd | Wholesale & retail | 2009 |
| Hidden Hair Studio Ltd | Other services | 2023 |
| Hidden Lizard Digital Ltd | Information & communication | 2020 |
| Hideaway Hair Salon Ltd | Other services | 2023 |
| Hideout ST James Ltd | Hospitality | 2025 |
| HIDS4U Limited | Wholesale & retail | 2005 |
| Hifix Global Limited | Wholesale & retail | 2024 |
| Hifly Solutions Ltd | Professional & scientific | 2025 |
| High Five After School Clubs Ltd | Health & social care | 2023 |
| High Glamour Limited | Wholesale & retail | 2016 |
| High Grade Projects Ltd | Construction | 2020 |
| High Level Electrical Ltd | Construction | 2025 |
| High Mileage Limited | Administrative & support | 2025 |
| High Peak Residential Care Limited | Health & social care | 2021 |
| High Road Parking Ltd | Transport & logistics | 2021 |
| High SAT UK Ltd | Wholesale & retail | 2021 |
| High Street Property Profiles Limited | Real estate | 2020 |
| High Wire Rope Access Electrical Ltd | Construction | 2011 |
| HIGH5 Holdings Ltd | Financial services | 2023 |
| Highclere Solutions Limited | Administrative & support | 2017 |
| Highcliffe Coach Holidays Ltd | Professional & scientific | 2001 |
| Highfield Court Residents (Winchester Road) Limited | Households | 2001 |
| Highfield Dental & Facial Clinic Ltd | Health & social care | 2024 |
| Highfield Diagnostics Ltd | Manufacturing | 2017 |
| Highfield House Lettings Limited | Real estate | 2018 |
| Highfield Medics Limited | Health & social care | 2011 |
| Highfield Professional Solutions Limited | Administrative & support | 2006 |
| Highgate SPV Ltd | Real estate | 2024 |
| Highland News and Media Limited | Information & communication | 2019 |
| Highland Oak Construction LLP | | 2025 |
| Highlifevision Ltd | Information & communication | 2024 |
| Highlight Roofing and Building Ltd | Construction | 2025 |
| Highmoor Engineering Limited | Professional & scientific | 2016 |
| Highpoint Hospitality Services Limited | Hospitality | 2013 |
| Highscope Media Limited | Professional & scientific | 2022 |
| Highspace Limited | Real estate | 2015 |
| Hightower Properties Limited | Real estate | 2021 |
| Hightownhill Ltd | Extraterritorial | 2019 |
| Highways Development Limited | Professional & scientific | 2017 |
| Higzi Asset Management Ltd | Real estate | 2024 |
| HIH Consultancy Limited | Professional & scientific | 2026 |
| Hijack Creative Ltd | Professional & scientific | 2020 |
| Hikari 44 Limited | Real estate | 2026 |
| Hikoki Power Tools (U.K.) Limited | Wholesale & retail | 1981 |
| Hilary Wili Clothing & Costume Limited | Manufacturing | 2000 |
| Hilbre Holdings Limited | Professional & scientific | 2015 |
| Hill Consultancy & Paralegal Services Limited | Professional & scientific | 2024 |
| Hill Hughes Consulting Ltd | Construction | 2016 |
| Hill Hughes Management Limited | Real estate | 2008 |
| Hill Valley Garage Ltd | Wholesale & retail | 2023 |
| Hillbuilt Construction Limited | Construction | 2024 |
| Hillbury Estates Limited | Financial services | 2025 |
| Hillcrest Security Ltd | Financial services | 2019 |
| Hillcroft Freehold Limited | Households | 2009 |
| Hillebrand Bulk Logistics Limited | Transport & logistics | 2006 |
| Hillfort Property Limited | Real estate | 2016 |
| Hillman Carpentry & Construction Limited | Construction | 2013 |
| Hillman Logistics Limited | Transport & logistics | 2026 |
| Hillmans Takeaway Ltd | Hospitality | 2025 |
| Hillside Avenue Homes Management Co Ltd | Real estate | 2012 |
| Hillside Financial Solutions Ltd | Financial services | 2020 |
| Hillside Management Company (Southampton) Limited | Other services | 1991 |
| Hillswalker Ltd | Construction | 2013 |
| Hilltop Dental Practice Limited | Health & social care | 2010 |
| Hilltop Property Management Services Ltd | Real estate | 2026 |
| Hillwood Motors Limited | Wholesale & retail | 1973 |
| Hiltingbury Road RTM Company Limited | Households | 2023 |
| Hilton Home Developments Ltd | Construction | 2017 |