| Heyman Haulage Ltd | Transport & logistics | 2025 |
| Heystack Limited | Information & communication | 2023 |
| HFD Property Ltd | Real estate | 2026 |
| Hfdi UK Ltd | Financial services | 2025 |
| HFG Construction Ltd | Construction | 2019 |
| Hfsapient Advisory Limited | Information & communication | 2016 |
| HG Holdco Limited | Financial services | 2026 |
| HG Jointing Limited | Construction | 2026 |
| HGN Tools Ltd | Wholesale & retail | 2025 |
| HGP Academy Services Limited | Professional & scientific | 2020 |
| HGP Property Group Limited | Real estate | 2026 |
| HGV Driver Recruitment (MK) Limited | Wholesale & retail | 2020 |
| Hgv-Ldv Ltd | Transport & logistics | 2021 |
| HH Gardening & Maintenance Ltd | Administrative & support | 2025 |
| HH Yuan Ltd. | Wholesale & retail | 2025 |
| Hhas Property Limited | Real estate | 2021 |
| HI MAN Ltd | Construction | 2025 |
| Hi-Dra Consultants Ltd | Professional & scientific | 2000 |
| Hiboux Limited | Real estate | 2017 |
| Hickeson (Nominees) Limited | Extraterritorial | 1996 |
| Hickeson Boyce Limited | Professional & scientific | 2003 |
| Hickeson Boyce Wealth Management Limited | Extraterritorial | 2013 |
| Hickman Property Services Limited | Construction | 2012 |
| Hidden Beauty Artworks Ltd | Arts & recreation | 2019 |
| Hidden Fence Ltd | Other services | 2024 |
| Hidos Building Limited | Construction | 2025 |
| Higgins Recruitment Limited | Administrative & support | 2010 |
| High + LOW Limited | Other services | 2026 |
| High Atlas Consulting Ltd | Professional & scientific | 2026 |
| High Beam Estates Limited | Real estate | 2023 |
| High Grange Services Ltd | Construction | 2021 |
| High Hazels Nursery Limited | Education | 2020 |
| High Move Limited | Real estate | 2016 |
| High Palace Ltd | Real estate | 2019 |
| High Performance Programmes Ltd | Information & communication | 2021 |
| High Point Real Estate Ltd | Real estate | 2024 |
| High Spec Cleaning Limited | Administrative & support | 2016 |
| High Spec Spaces Ltd | Real estate | 2019 |
| High Ticket Hub Ltd | Administrative & support | 2025 |
| Higham Consultancy Limited | Professional & scientific | 2015 |
| Higham Groundworks and Civil Engineering Limited | Construction | 2014 |
| Highbury Building Services Ltd | Real estate | 2014 |
| Highbury Home Developments Ltd | Real estate | 2025 |
| Highchair Supported Living Ltd | Health & social care | 2025 |
| Higher Height Care Ltd | Health & social care | 2020 |
| Higher Heights Educational Services Limited | Education | 2020 |
| Higher Knowledge Limited | Information & communication | 1984 |
| Higher Safety Consultancy Ltd | Professional & scientific | 2024 |
| Higher Study Ltd | Education | 2024 |
| Highfield Park Ltd | Information & communication | 2018 |
| Highgate Platinum Wash Ltd | Administrative & support | 2026 |
| Highglen Ltd | Health & social care | 2020 |
| Highhill Global Services Ltd | Education | 2025 |
| Highsomite Limited | Health & social care | 2023 |
| Highway Harvesters Ltd | Other services | 2024 |
| Highway Utilities Limited | Construction | 2009 |
| Hildron Finance Limited | Real estate | 1984 |
| Hill Construction & Renovations Ltd | Construction | 2012 |
| Hill House Homes Ltd | Real estate | 2026 |
| Hill Morton Limited | Real estate | 2016 |
| Hill Roofing Ltd | Construction | 2025 |
| Hillgib Property Limited | Real estate | 2005 |
| Hillocks Estates Limited | Construction | 2022 |
| Hillside Management Company (Little Horwood) Limited | Households | 2017 |
| Hilltop CS Ltd | Construction | 2020 |
| Hilltop Day Hub CIC | Health & social care | 2026 |
| Hilltophousingmk Ltd | Real estate | 2024 |
| Hilltopox Ltd | Real estate | 2026 |
| Hilo Maritime Risk Management Limited | Information & communication | 2018 |
| Hilo Maritime Risk Management Opco Limited | Information & communication | 2023 |
| Hilson Scaffolding Limited | Construction | 2026 |
| Hilt AI Ltd | Information & communication | 2025 |
| Hilton Property Supermarket Ltd | Real estate | 2024 |
| Himalayan Gurkha Food Limited | Hospitality | 2024 |
| Himalayan Gurkha Mart Ltd | Wholesale & retail | 2025 |
| Himtcare Ltd | Health & social care | 2025 |
| Hina Limited | Other services | 2026 |
| Hinsey Holdings Limited | Professional & scientific | 2024 |
| Hintonwood Drylining & Plastering Ltd | Construction | 2020 |
| HIP HOP Fashions Limited | Information & communication | 2005 |
| Hipgrave Business Solutions Limited | Professional & scientific | 2006 |
| Hippey Accountancy Services Limited | Professional & scientific | 2017 |
| Hippocratech Ltd | Extraterritorial | 2021 |
| Hippocratv Ltd | Education | 2016 |
| Hira Cash and Carry Ltd | Wholesale & retail | 2020 |
| Hirata Holdings Limited | Hospitality | 2024 |
| Hire a Hubby MGT Limited | Construction | 2025 |
| Hire Epic Ltd | Information & communication | 2014 |
| Hire for Parties Systems Limited | Administrative & support | 2016 |
| Hirondelles Consultancy Limited | Professional & scientific | 2020 |
| HIT Cleaning Services Ltd | Administrative & support | 2025 |
| HIT Distribution Ltd | Wholesale & retail | 2025 |
| Hitak Ltd | Transport & logistics | 2021 |
| Hitcham’S Homes Ltd | Real estate | 2026 |
| Hitmix Bingo MK Ltd | Administrative & support | 2023 |
| Hive & Leaf Limited | Information & communication | 2026 |
| Hive Consulting Services Ltd | Professional & scientific | 2024 |
| Hive Creative (UK) Limited | Administrative & support | 2004 |
| Hive One Developments Ltd | Construction | 2026 |
| Hive Payments Limited | Professional & scientific | 2022 |