| Hickstyle Limited | Wholesale & retail | 1998 |
| Higgins Property Services Ltd | Construction | 2016 |
| Higgins Stag Ltd | Arts & recreation | 2018 |
| High Hopes Investments (UK) Limited | Professional & scientific | 2021 |
| High Jump Ltd | Arts & recreation | 2024 |
| High Park Property Group Ltd | Real estate | 2021 |
| High Ridge (Sydney Road N10) Management Limited | Households | 1976 |
| High Street (Camden) Limited | Hospitality | 2014 |
| Highbury Square Management Company Limited | Households | 2005 |
| Higher Level Developments Limited | Construction | 2020 |
| Highest Peak Ltd | Other services | 2025 |
| Highfield (Bushey) Management Company Limited | Households | 2000 |
| Highfield Close Estate Management Company Ltd | Households | 2021 |
| Highfield Investments London Limited | Real estate | 2012 |
| Highmede Limited | Professional & scientific | 2024 |
| Hill Village Diagnostics Ltd | Health & social care | 2025 |
| Hillcrest Lodge RTM Company Limited | Households | 2016 |
| Hillfields Contract Limited | Construction | 2017 |
| Hillstow Limited | Construction | 2008 |
| Hilltop Medical Ltd | Health & social care | 2021 |
| Hilltrack Limited | Real estate | 2011 |
| Hiltcuprod Ltd | Professional & scientific | 2025 |
| Hilti Air Limited | Administrative & support | 2016 |
| Hinton Properties Ltd | Real estate | 2013 |
| Hipgroup Limited | Hospitality | 2024 |
| Hiqma Properties Limited | Households | 2024 |
| Hire Calibre Talent Solutions Limited | Administrative & support | 2018 |
| Hive Mortgages Limited | Financial services | 2016 |
| HJ Collection 10 Limited | Construction | 2025 |
| HJ Collection 2 Ltd | Real estate | 2020 |
| HJ Collection 3 Limited | Construction | 2021 |
| HJ Collection 4 Limited | Construction | 2022 |
| HJ Collection 5 Limited | Construction | 2023 |
| HJ Collection 6 Limited | Construction | 2025 |
| HJ Collection Asbestos Removal Specialists Limited | Construction | 2023 |
| HJ Collection Construction Limited | Construction | 2022 |
| HJ Collection Developers Limited | Construction | 2022 |
| HJ Collection Holdings Ltd | Financial services | 2020 |
| HJ Collection Ltd | Construction | 2019 |
| HJ Collection Maintenance Contractors Limited | Construction | 2023 |
| HJ Collection Management Company Limited | Real estate | 2024 |
| HJ Collection Solutions Limited | Construction | 2023 |
| Hjbz Investments | Professional & scientific | 2025 |
| HJC Props Ltd | Arts & recreation | 2022 |
| HJC4 Abigail CT Limited | Real estate | 2023 |
| HJC4 Cobham Limited | Real estate | 2023 |
| HJC4 Weybridge Limited | Real estate | 2023 |
| HJC5 Bishops Stortford Limited | Real estate | 2024 |
| HJC5 Guildford Limited | Construction | 2025 |
| HJC5 Maidenhead Limited | Construction | 2025 |
| HJK1 Limited | Professional & scientific | 2024 |
| HJL Design Limited | Administrative & support | 2012 |
| HK Home Architects and Consultants Ltd | Construction | 2021 |
| HK Plumbing and Property Services Ltd | Manufacturing | 2019 |
| HKG Construction Ltd | Construction | 2026 |
| Hldkn Ltd | Professional & scientific | 2024 |
| HM Associates Services Ltd | Professional & scientific | 2019 |
| HMC Properties Group Ltd | Real estate | 2021 |
| HNZ & Associates Limited | Education | 2025 |
| HNZ Consultants Limited | Real estate | 2016 |
| Hoardingmaster Ltd | Extraterritorial | 2011 |
| Hobbymatch Ltd | Information & communication | 2026 |
| Hodford Road Jjjf RTM Company Limited | Households | 2020 |
| HOF Regents Park Ltd | Arts & recreation | 2024 |
| Hogan Heroes Ltd | Administrative & support | 2016 |
| Hogarth Court Limited | Households | 1978 |
| Hogo-Sha UK Ltd | Administrative & support | 2018 |
| Holden Heights Freehold Limited | Households | 2004 |
| Holding the Space Ltd. | Health & social care | 2024 |
| Holdsworth Security Limited | Administrative & support | 2019 |
| Holed Investments Limited | Financial services | 2024 |
| Holgate Security Services Limited | Administrative & support | 2017 |
| Holistic Access - Let's Talk Ltd | Health & social care | 2018 |
| Hollway Advisory Services UK Limited | Professional & scientific | 2024 |
| Hollydog Limited | Professional & scientific | 2021 |
| Holmes Concierge Ltd | Other services | 2026 |
| Holne Chase Productions Ltd | Information & communication | 2023 |
| Holt Properties Limited | Real estate | 2017 |
| Home Cinema Company Ltd | Wholesale & retail | 2018 |
| Home Compliance UK Ltd | Professional & scientific | 2025 |
| Home Counties Estate Agents Limited | Real estate | 2015 |
| Home Emergency Care Ltd | Professional & scientific | 2022 |
| Home Entertainment Specialists Ltd | Other services | 2010 |
| Home Farm Biddestone Ltd | Construction | 2026 |
| Home of Shade Limited | Other services | 2022 |
| Home Sweep Home Limited | Administrative & support | 2019 |
| Homefactors Limited | Wholesale & retail | 1952 |
| Homegrown Adventure Group Limited | Wholesale & retail | 2020 |
| Homeguard Solutions Limited | Construction | 2017 |
| Homes and Investments Ltd | Real estate | 2026 |
| Homes Around Property Management Ltd | Households | 2025 |
| Homewise Properties Co. Limited | Extraterritorial | 2001 |
| Homli Limited | Real estate | 2017 |
| Honest Gadgets Ltd | Wholesale & retail | 2015 |
| Hoop Homes Ltd | Real estate | 2020 |
| Hope Corp Limited | Real estate | 2007 |
| Horizon Mortgage Company Limited | Financial services | 2003 |
| Horley Investments Limited | Administrative & support | 2020 |
| Horsley Road Properties Limited | Real estate | 2017 |
| Hosking Equipment Limited | Wholesale & retail | 2022 |