| Hazaay Ltd | Extraterritorial | 2023 |
| Hazelmere Walk E Residents (2016) Limited | Real estate | 2016 |
| HB 1 Properties Ltd | Real estate | 2021 |
| HB UK Developments Limited | Real estate | 2016 |
| HBA Estates Limited | Construction | 2025 |
| HBS Contractors Ltd | Manufacturing | 2023 |
| HCW Construction Limited | Construction | 2025 |
| HD Trucare Ltd | Wholesale & retail | 2024 |
| Healthcare Staffing Enterprise Ltd | Other services | 2016 |
| Heaphy Property Limited | Households | 2021 |
| Heathrow Companies Group Limited | Financial services | 2016 |
| Heathrow Concrete Pumping Limited | Administrative & support | 2012 |
| Heathrow Environmental Ltd | Construction | 2014 |
| Heathrow Logistic Services Ltd | Transport & logistics | 2022 |
| Heathrow Malayali Cricket Club Limited | Arts & recreation | 2025 |
| Heathrow Plant (UK) Limited | Administrative & support | 2012 |
| Heathrow Services Limited | Transport & logistics | 2025 |
| Heavy Metal Tools Limited | Wholesale & retail | 2012 |
| Heera Electrical Ltd | Construction | 2019 |
| Heera Estate Ltd | Real estate | 2024 |
| Hemesh Food and Wine UK Ltd | Wholesale & retail | 2021 |
| Hemingway Group PVT Ltd | Manufacturing | 2025 |
| Hero Media Ltd | Information & communication | 2024 |
| Hewad Developments Limited | Construction | 2016 |
| Hiba Services Ltd | Financial services | 2019 |
| Hifi Emporium Limited | Wholesale & retail | 2024 |
| Hill & Co Renovations Ltd | Construction | 2026 |
| Hilltop Local Limited | Wholesale & retail | 2023 |
| Himalayan Gurkha UK Limited | Hospitality | 2014 |
| Hiti Properties Ltd | Real estate | 2025 |
| HK Land & Homes Limited | Real estate | 2024 |
| HMA Group Ltd | Information & communication | 2025 |
| HMT Service Ltd | Wholesale & retail | 2017 |
| HN Convenience Store Ltd | Wholesale & retail | 2011 |
| Holistic Send Alliance Limited | Education | 2021 |
| Holland Park DRY Cleaners Limited | Other services | 2025 |
| Holloway Lane Residents Company Limited | Real estate | 1994 |
| Home Improvements Ltd | Construction | 2024 |
| Home Plus Ecocoo Limited | Construction | 2024 |
| Home Scent Properties Ltd | Real estate | 2017 |
| HOME2HOUSE Limited | Real estate | 2023 |
| Homecheckout Limited | Wholesale & retail | 2020 |
| Homeforever Enterprise Ltd | Wholesale & retail | 2025 |
| Hometech Plumbing & Heating Limited | Construction | 2021 |
| HOPE4HOMELESSNESS Limited | Health & social care | 2024 |
| Horizon Solutions (KT) Limited | Extraterritorial | 2014 |
| Host Assistants Ltd | Households | 2023 |
| Hot-Wire Solutions Ltd | Information & communication | 2011 |
| Hotshots Academy Ltd | Arts & recreation | 2021 |
| House of DEE Limited | Transport & logistics | 1997 |
| House of R45 Ltd | Wholesale & retail | 2023 |
| Housego Ltd | Administrative & support | 2026 |
| Hoyde Ltd | Hospitality | 2026 |
| HP Mobile Ltd | Wholesale & retail | 2025 |
| HP1 Retail Limited | Wholesale & retail | 2017 |
| Hq's Financial Services Ltd | Professional & scientific | 2024 |
| HR Brand Group Limited | Information & communication | 2025 |
| HR Euro Food City Ltd | Wholesale & retail | 2016 |
| Hrhk Retail Limited | Wholesale & retail | 2019 |
| HS10 Limited | Transport & logistics | 2025 |
| Hubble Investments Ltd | Construction | 2025 |
| Hubble Property Ltd | Construction | 2018 |
| Hugs Food and Wine Ltd | Wholesale & retail | 2026 |
| Husn-E-Riwaj Ltd | Wholesale & retail | 2019 |
| Hutha Company Ltd | Wholesale & retail | 2018 |
| HWB Construction Ltd | Construction | 2016 |
| HWB Surveying Ltd | Construction | 2026 |
| Hylar Ltd | Other services | 2025 |
| Hyper Corporate Services Ltd | Administrative & support | 2025 |
| I Bar UK Limited | Other services | 2010 |
| I Brands Group Ltd | Wholesale & retail | 2019 |
| I Love Pierogi Polish Food Ltd | Hospitality | 2024 |
| I&S Signature Homes Ltd | Real estate | 2025 |
| IA Optom Ltd | Health & social care | 2024 |
| IB Cleaning Services Ltd | Administrative & support | 2018 |
| Ibeji Property Limited | Real estate | 2024 |
| Iberpack Limited | Transport & logistics | 2020 |
| ID Services Ltd | Construction | 2026 |
| IDARE2INSPIRE Ltd | Education | 2018 |
| IFH Finance Limited | Financial services | 2006 |
| IG Building Ltd | Construction | 2021 |
| IG Training Ltd | Administrative & support | 2021 |
| Ignas Store Ltd | Wholesale & retail | 2020 |
| Igranabdulahi Ltd | Information & communication | 2025 |
| Igwe Boaz Ltd | Real estate | 2025 |
| IKG Property Investments Ltd | Real estate | 2025 |
| Iknt Ltd | Real estate | 2022 |
| Ikramsalah Ltd | Health & social care | 2023 |
| ILI Cornerstone Ltd | Real estate | 2026 |
| ILI Keystone Ltd | Real estate | 2026 |
| ILI Properties Ltd | Real estate | 2022 |
| ILI Tech Ltd | Wholesale & retail | 2024 |
| ILLUMIN8 Consulting UK Limited | Professional & scientific | 2018 |
| Imanpower Ltd | Construction | 2020 |
| Iman’S Beauty LAB Limited | Other services | 2024 |
| Imka Prestige Ltd | Real estate | 2022 |
| Inception Design Studios Limited | Wholesale & retail | 2014 |
| Independent Film Financing and Consultancy Ltd | Information & communication | 2011 |
| India Club Limited | Education | 2025 |
| Indus Logistica and Supplies Ltd | Administrative & support | 2025 |