| Host Dealer Limited | Manufacturing | 2014 |
| Hostrange Limited | Administrative & support | 2004 |
| Hot OFF the Press London Ltd | Administrative & support | 2013 |
| Hot Pottery Ltd | Wholesale & retail | 2020 |
| Hot Prop Ltd | Arts & recreation | 2021 |
| Hotel Income Reit Ltd | Financial services | 2019 |
| Hotel Logistics Ltd. | Construction | 2018 |
| Hotel Presents Limited | Administrative & support | 2015 |
| Hoti Limited | Real estate | 2025 |
| Hotshot Productions Limited | Information & communication | 2022 |
| House Captain Ltd | Professional & scientific | 2022 |
| House Medical Consultants Ltd | Health & social care | 2020 |
| House of Fit Limited | Arts & recreation | 2019 |
| House of Fitness Holdings Ltd | Financial services | 2024 |
| House of Parrots Ltd | Wholesale & retail | 2025 |
| House of Prayer for ALL Nations Ministries(Endtime Revival Prayer City) Ltd | Other services | 2021 |
| House of Zaira UK Limited | Real estate | 2016 |
| Housealllifelong Ltd | Real estate | 2022 |
| Hove Brothers Limited | Financial services | 2018 |
| HOW 2 MOT Ltd | Administrative & support | 2007 |
| Howard Bennett T/A Trotters UK Ltd | Transport & logistics | 2021 |
| Howes Creative Ltd | Professional & scientific | 2019 |
| Hoxha Group Ltd | Construction | 2022 |
| Hoxton Street Property Management Limited | Households | 2013 |
| HP Partners Limited | Financial services | 2020 |
| HPM Contracts Ltd | Construction | 2007 |
| HQ Couriers Ltd | Transport & logistics | 2017 |
| HQ Properties Limited | Real estate | 2025 |
| Hqbasics Ltd | Wholesale & retail | 2016 |
| HR in a Box Limited | Administrative & support | 2014 |
| HR Styling Ltd | Professional & scientific | 2023 |
| Hrika Limited | Real estate | 2025 |
| Hrma Technologies Limited | Information & communication | 2011 |
| HS Entrepreneur Limited | Transport & logistics | 2022 |
| HSN 2026 Ltd | Real estate | 2026 |
| HSN Finance Ltd | Financial services | 2024 |
| HSN Holdco Ltd | Professional & scientific | 2026 |
| HSN UK Properties Ltd | Real estate | 2022 |
| Hsquared (Tunbridge Wells) Ltd | Construction | 2023 |
| Hsquared (Wayside Farm) Ltd | Construction | 2023 |
| Hsquared Development Group Ltd | Financial services | 2022 |
| Hstc Shop Ltd | Wholesale & retail | 2019 |
| HT Recruitment Limited | Administrative & support | 2007 |
| HTS Transportation Services Ltd | Wholesale & retail | 2021 |
| Hub Education Group Ltd | Financial services | 2024 |
| Hub Education Ltd | Education | 2024 |
| Hugel Design Limited | Professional & scientific | 2017 |
| Hughes Dressage International Ltd | Arts & recreation | 2019 |
| Hughes Dressage Livery Ltd | Arts & recreation | 2015 |
| Hughes Dressage Media Ltd | Arts & recreation | 2019 |
| Hughes Dressage Training Ltd | Arts & recreation | 2015 |
| Hugo DA Silva Design Studio Ltd | Professional & scientific | 2016 |
| Humairaz Limited | Transport & logistics | 2019 |
| Human Synergistics Interconnext Limited | Professional & scientific | 2010 |
| Humbil Properties Ltd | Real estate | 2021 |
| Hummingbird Domiciliary Care Ltd | Health & social care | 2025 |
| Humphrey Belle Limited | Construction | 2016 |
| Hunter + Rose Ltd | Wholesale & retail | 2021 |
| Hunter Heywood Limited | Administrative & support | 2018 |
| Huntingdon Limited | Administrative & support | 2008 |
| HV United Ltd | Construction | 2020 |
| HVS Holdings Limited | Financial services | 2017 |
| HW Steel Ltd | Wholesale & retail | 2022 |
| HWS and Sons Roofing and Guttering Solutions Ltd | Construction | 2016 |
| HXS Property Ltd | Real estate | 2018 |
| Hy-Pro Building Ltd | Construction | 2021 |
| HYA Football Limited | Extraterritorial | 2019 |
| Hyatt Homes Limited | Real estate | 2016 |
| Hyaurum Limited | Financial services | 2023 |
| Hycgan Limited | Construction | 2014 |
| Hyde Park Consultancy Limited | Administrative & support | 2015 |
| Hydro Kinetic Power Ltd | Energy | 2021 |
| Hydrogen Power Generation Solutions Ltd | Administrative & support | 2012 |
| Hyelite Home Investments Ltd | Real estate | 2022 |
| Hyland Property Holdings Limited | Financial services | 2024 |
| Hypercloud Professionals Limited | Extraterritorial | 2015 |
| Hypercube Limited | Information & communication | 1990 |
| Hypereport Ltd | Professional & scientific | 2025 |
| I a Properties Ltd | Real estate | 2014 |
| I AM Curious...Productions | Information & communication | 2016 |
| I D Construction (Nottm) Limited | Construction | 2009 |
| I GOT Back UP Ltd | Information & communication | 2023 |
| I Handi Limited | Wholesale & retail | 2018 |
| I Only Wear Shorts Limited | Arts & recreation | 2020 |
| I Phillips & Co Limited | Hospitality | 2025 |
| I Sell IT Ltd | Other services | 2012 |
| I Singh Medical Services Ltd | Health & social care | 2015 |
| I Sopher Limited | Professional & scientific | 2014 |
| I&Ar Property Ltd | Real estate | 2016 |
| I-Fx Media Ltd | Manufacturing | 2010 |
| I7 Technologies Limited | Information & communication | 1999 |
| IAM Castings Limited | Arts & recreation | 2011 |
| IAN Forster Limited | Other services | 2018 |
| IAN Green Holdings Ltd | Financial services | 2021 |
| IAN Green Properties Limited | Real estate | 2007 |
| IAN Green Residential LLP | | 2025 |
| IAN Martin Inc Limited | Professional & scientific | 2013 |
| IAN Wyness Advertising Limited | Professional & scientific | 1995 |
| IB Fire Protection Ltd | Public administration | 2020 |
| Ibericos ETC. (Metro) Limited | Hospitality | 2022 |