| Hillier Blake Advisory Limited | Professional & scientific | 2025 |
| Hillier Blake Capital Limited | Real estate | 2024 |
| Hillier Blake Limited | Professional & scientific | 2025 |
| Hillier Blake Property Management Limited | Real estate | 2026 |
| Hills Cafe Enterprise Limited | Hospitality | 2019 |
| Hills News & Wine Ltd | Administrative & support | 2016 |
| Hilltop Home Essentials Ltd | Real estate | 2025 |
| Hillview Homes UK Ltd | Construction | 2021 |
| Hilwood Associates Limited | Wholesale & retail | 2019 |
| Himalaya Peaks Ltd | Real estate | 2020 |
| Hinton Utility Services Ltd | Construction | 2025 |
| Hipo Consultancy Limited | Professional & scientific | 2017 |
| Hira a 2 Z Property Ltd | Real estate | 2023 |
| Hiram 49 Ltd | Other services | 2025 |
| Hire UP Ltd | Administrative & support | 2021 |
| HIS Express Limited | Wholesale & retail | 2023 |
| HIT Hard Ltd | Wholesale & retail | 2020 |
| Hitchin Live Limited | Arts & recreation | 2025 |
| Hiteck Education Ltd | Other services | 2021 |
| Hizmet Butchers Ltd | Professional & scientific | 2016 |
| Hizyolu Properties Ltd | Real estate | 2025 |
| Hjkr Management Ltd | Professional & scientific | 2016 |
| HJM Services Limited | Other services | 2016 |
| HJS In-Put Design Limited | Construction | 2014 |
| HK Energy Ltd | Professional & scientific | 2015 |
| HK Enfield Limited | Hospitality | 2025 |
| HK Fish Ltd | Other services | 2026 |
| HK FUE LLP | | 2006 |
| HK Hammam Ltd | Other services | 2020 |
| HK HK Ltd | Wholesale & retail | 2025 |
| HK Property Portfolios Ltd | Real estate | 2021 |
| HK World Care Ltd | Health & social care | 2025 |
| HKT Motors Ltd | Wholesale & retail | 2023 |
| HLA Transport Ltd | Construction | 2022 |
| Hlads Ltd | Professional & scientific | 2024 |
| Hlam Services Limited | Administrative & support | 2021 |
| Hlnet Ltd | Information & communication | 2022 |
| HM Amusements Limited | Arts & recreation | 2010 |
| HM Vehicles Ltd | Wholesale & retail | 2025 |
| HMB Solar Limited | Construction | 2021 |
| HMD Fitness Ltd | Health & social care | 2024 |
| HME Grocery Ltd | Wholesale & retail | 2020 |
| Hmedical Imaging Ltd | Health & social care | 2021 |
| HMT Food & Wine Ltd | Wholesale & retail | 2020 |
| HMV Brothers Ltd | Real estate | 2026 |
| HN Enterprise Ltd | Other services | 2019 |
| HNM Real Estate Ltd | Real estate | 2024 |
| HNP Globes Ltd | Wholesale & retail | 2014 |
| HNZ Group Ltd | Wholesale & retail | 2024 |
| HOA HOA Limited | Other services | 2022 |
| HOA LAN Limited | Other services | 2026 |
| Hoang Viet ANH Limited | Other services | 2020 |
| Hobby Home London Limited | Real estate | 2014 |
| Hobby Life (UK) Limited | Wholesale & retail | 2014 |
| Hoga Plumbing & Heating Ltd | Construction | 2024 |
| Holistic Education & Sport Support Services CIC | Education | 2021 |
| Holistic Investment Property Limited | Real estate | 2024 |
| Holistic Xtra Cover Ltd | Health & social care | 2019 |
| Holland Air Conditioning Limited | Construction | 1991 |
| Holloway Investment Holdings Ltd | Real estate | 2017 |
| Hollowvale Ltd | Professional & scientific | 2006 |
| Hollywood Nails (VL) Limited | Other services | 2019 |
| Hollywood Nails (Watford) Limited | Other services | 2016 |
| Hollywood Style Ltd | Administrative & support | 2025 |
| Holtwhite Avenue 33 35 36 38 Freehold Limited | Households | 2012 |
| Holtwhites Bakery Limited | Wholesale & retail | 2011 |
| Holy Host Ltd | Extraterritorial | 2019 |
| Home & Decor Ltd | Wholesale & retail | 2024 |
| Home and Office Supplies Ltd Ltd | Wholesale & retail | 2024 |
| Home and Wall Decor Ltd | Wholesale & retail | 2025 |
| Home Clean Services Ltd | Households | 2023 |
| Home Restoration Works Ltd | Construction | 2023 |
| Homecroft Limited | Professional & scientific | 2017 |
| Homelife Living Interiors Limited | Construction | 2007 |
| Homely Care Limited | Health & social care | 2006 |
| Homenet Consulting Ltd | Information & communication | 2019 |
| Homes of Florence Ltd | Wholesale & retail | 2025 |
| Hometrend Supplies (Southern) Limited | Wholesale & retail | 1980 |
| Homlux Ltd | Wholesale & retail | 2024 |
| Honestly Tasty Ltd. | Manufacturing | 2018 |
| Honey Nails & Spa Limited | Other services | 2021 |
| Honey Pots Chicken and Waffle House Ltd | Hospitality | 2023 |
| Honeyland Holdings Ltd | Construction | 2023 |
| Honeylove Care Ltd | Health & social care | 2013 |
| Hong Kong Racing Limited | Extraterritorial | 2013 |
| Honilac Nutrition Limited | Wholesale & retail | 2018 |
| Hoover Building Investment Ltd | Real estate | 2021 |
| Hope Care Services Limited | Real estate | 2001 |
| Hope Event Ltd | Professional & scientific | 2021 |
| HOPE4YOU Housing C.I.C. | Hospitality | 2017 |
| Hopecare Supported Living Ltd | Health & social care | 2023 |
| Hoper Solutions Ltd | Professional & scientific | 2019 |
| Hopper and Bean Properties Ltd | Real estate | 2021 |
| Hoque Properties Management Ltd | Real estate | 2024 |
| Horne Dennison Ltd | Financial services | 2023 |
| Hornsey Kebab House Ltd | Hospitality | 2015 |
| Hortitech Limited | Wholesale & retail | 2017 |
| Horton Developments (Essex) Limited | Real estate | 2014 |
| Hoseki Publishing Ltd | Wholesale & retail | 2023 |
| Hospitalim Limited | Health & social care | 2023 |