| Holsales Limited | Wholesale & retail | 2022 |
| Holt Maintenance Ltd | Administrative & support | 2011 |
| Home & Leisure UK Limited | Real estate | 2024 |
| Home and Away Gaming Limited | Arts & recreation | 2020 |
| Home Deco Property Management Ltd | Households | 2018 |
| Home Front Renovations Ltd | Construction | 2023 |
| Home Run London Ltd | Construction | 2020 |
| Home Run London Property Services Ltd | Administrative & support | 2020 |
| Home Service Building Ltd | Construction | 2025 |
| Home Solve Housing CIC | Hospitality | 2026 |
| Home Solve Property Management Limited | Real estate | 2015 |
| Home Stamps Limited | Real estate | 2024 |
| Homeclean Dartford Limited | Administrative & support | 2017 |
| Homefield Road Management Company Limited | Administrative & support | 2002 |
| Homelands Care LLP | | 2014 |
| Homenia Ltd | Real estate | 2024 |
| Homeopathy Online Ltd | Health & social care | 2020 |
| Homesdale Bromley Tyres Ltd | Manufacturing | 2020 |
| Homesdale Property Investments Limited | Real estate | 2021 |
| Homesdale Property Limited | Real estate | 2016 |
| Homesdale Supported Living Ltd | Health & social care | 2020 |
| Homezone Property Services Beckenham Limited | Real estate | 2015 |
| Honestlycanine Ltd | Agriculture & fishing | 2026 |
| Honey Badger Development Ltd | Information & communication | 2022 |
| Honeycomb Construction Services Limited | Professional & scientific | 2023 |
| Honeycomb Live UK Limited | Arts & recreation | 2023 |
| Honeymol Ltd | Real estate | 2026 |
| Honeysuckle Investments Limited | Real estate | 2016 |
| Honjarris Ltd | Information & communication | 2011 |
| Honoris Consulting Limited | Health & social care | 2012 |
| Hook Farm Allotments Ltd | Arts & recreation | 2021 |
| Hope Assured Network CIC | Education | 2023 |
| Hope Brothers Biggin Hill Limited | Wholesale & retail | 2022 |
| Hope Park Bromley Freehold Limited | Real estate | 2008 |
| Hopido Builders Ltd | Administrative & support | 2018 |
| Hoping Hands CIC | Administrative & support | 2026 |
| Hopkins Writes Ltd | Information & communication | 2023 |
| Hopt Homes Limited | Real estate | 2025 |
| Hopton House Management Limited | Households | 2014 |
| Hoque Property Investments Ltd | Real estate | 2023 |
| Horder Financial Services Limited | Financial services | 1988 |
| Horizon Aero Group Ltd | Construction | 2025 |
| Horizon Corp Limited | Administrative & support | 2020 |
| Horizon One London Limited | Construction | 2025 |
| Horizon Property London Ltd | Real estate | 2022 |
| Horizon Roofing Specialist Limited | Construction | 2011 |
| Hormone Harmony Health Clinic London Limited | Health & social care | 2025 |
| Hornsong Limited | Construction | 1980 |
| Horolo Limited | Wholesale & retail | 2023 |
| Horsell Road Allotments & Leisure Gardens Limited | Arts & recreation | 2022 |
| Horsted Services Limited | Construction | 2002 |
| Horticole Ltd | Administrative & support | 2019 |
| Hortons Valuers Limited | Real estate | 2018 |
| Hosking Francis Limited | Real estate | 2024 |
| Hot Fuzz Digital Ltd | Information & communication | 2018 |
| Hot Sauces Cartel Ltd | Manufacturing | 2025 |
| Hotcreativelondon Ltd | Professional & scientific | 2020 |
| Hotelier London Ltd | Administrative & support | 2022 |
| Hots Productions Ltd | Administrative & support | 2021 |
| Hotston Construction Management Ltd | Construction | 2023 |
| Hotwire Communications Limited | Professional & scientific | 2011 |
| Housar Limited | Information & communication | 2017 |
| House 47 Limited | Households | 2003 |
| House Clarence Limited | Construction | 2026 |
| House of Aesthetics London Ltd | Professional & scientific | 2020 |
| House of Bertrand Ltd | Other services | 2018 |
| House of Bloom YK Ltd | Other services | 2025 |
| House of Clean Ltd | Manufacturing | 2026 |
| House of Djellab Limited | Administrative & support | 2026 |
| House of Liquorice Limited | Wholesale & retail | 2025 |
| House of OTB Ltd | Wholesale & retail | 2022 |
| House of Ógin Ltd | Administrative & support | 2023 |
| Houseforce (London) Limited | Construction | 2022 |
| Housekeeping Star Ltd | Administrative & support | 2023 |
| Howard Park House Limited | Households | 2004 |
| Howard Road Properties Limited | Real estate | 1999 |
| Howdini Carpentry & Locksmith Limited | Manufacturing | 2026 |
| HPB Capital Limited | Financial services | 2019 |
| HR Unlocked Limited | Professional & scientific | 2013 |
| HS Brands International UK Ltd | Professional & scientific | 2015 |
| HS Irving Limited | Construction | 2023 |
| HS Solution Limited | Hospitality | 2025 |
| HS Walker Ltd | Construction | 2023 |
| HTA Property Company Ltd | Real estate | 2024 |
| Htcd Construction Ltd | Construction | 2026 |
| Htclothing Design & Accessories Ltd | Wholesale & retail | 2022 |
| Htesupply Ltd | Wholesale & retail | 2025 |
| Htfs Limited | Financial services | 2020 |
| HTS After School Clubs Ltd | Education | 2019 |
| Hualixin Chang Limited | Professional & scientific | 2003 |
| Hubble Media Ltd | Information & communication | 2009 |
| Huebee Limited | Manufacturing | 2025 |
| Hugi Consulting Ltd | Information & communication | 2022 |
| Hugo Loves JAM Ltd | Professional & scientific | 2025 |
| Hulbert Construction Ltd | Construction | 2022 |
| Hulitskiy Construction Limited | Construction | 2024 |
| Humla Limited | Health & social care | 2022 |
| Hunaluxe Ltd | Construction | 2026 |
| Hungry in London Ltd | Administrative & support | 2019 |
| Hunky Dory Creative Ltd | Other services | 2003 |