| HSE Store Ltd | Wholesale & retail | 2023 |
| HSH Capital Limited | Administrative & support | 2023 |
| HSJ Builders Ltd | Construction | 2019 |
| Hslk Energy Services Ltd | Other services | 2023 |
| HSM Core Ltd | Wholesale & retail | 2023 |
| HSM Textiles Ltd | Wholesale & retail | 2024 |
| Hsnacks Ltd | Hospitality | 2025 |
| Hsrk Limited | Information & communication | 2022 |
| Hsrm Group Ltd | Hospitality | 2020 |
| HSS Foods Limited | Hospitality | 2023 |
| Hssa Ltd | Hospitality | 2023 |
| Hsusso Trading Ltd | Wholesale & retail | 2025 |
| HSV Next Level Ltd | Construction | 2025 |
| HSZ Pharma Limited | Wholesale & retail | 2024 |
| HT FIX Ltd | Construction | 2016 |
| HT Sales and Consultancy Limited | Professional & scientific | 2025 |
| HTO Ltd | Administrative & support | 2025 |
| Htrep Properties Limited | Real estate | 2026 |
| HTV Limited | Wholesale & retail | 2023 |
| Hubbard’S Homes Ltd | Construction | 2024 |
| Hudson MIP Ltd | Real estate | 2023 |
| Hudson Research Limited | Professional & scientific | 2011 |
| Hughes Building Services Limited | Construction | 2003 |
| Human Resources Limited | Professional & scientific | 2025 |
| Humankind AI Ltd | Information & communication | 2024 |
| Humayra Ventures Limited | Information & communication | 2025 |
| Humberto Packaging Ltd | Administrative & support | 2024 |
| Humble Logistics Transport Service Ltd | Transport & logistics | 2025 |
| Humbolt Sales Limited | Professional & scientific | 2025 |
| Hummingbird Pro Cleaning Ltd | Administrative & support | 2025 |
| Hummingbird Shop Limited | Wholesale & retail | 2022 |
| Humza Foods Limited | Hospitality | 2020 |
| Humza Halal Poultry Limited | Wholesale & retail | 2018 |
| Hundal Constructions London Ltd | Construction | 2023 |
| Hundal Drylining Ltd | Construction | 2017 |
| Hungry Hoppers Ltd | Hospitality | 2024 |
| Hungry Squid Ltd | Professional & scientific | 2024 |
| Hunn Group Limited | Financial services | 2021 |
| Hunn Holdings Limited | Financial services | 2010 |
| Hunt & Hunt LLP | | 2012 |
| Hunt Property Services Havering Ltd | Households | 2022 |
| Hunters Organisation Ltd | Other services | 2025 |
| Hunters Property Services Limited | Construction | 2025 |
| Hurlingham Gray Limited | Administrative & support | 2017 |
| Hurstline Ltd | Construction | 2023 |
| Husam Ahmed Ltd | Transport & logistics | 2024 |
| Hushed Harbours Ltd | Other services | 2024 |
| Hussain Immigration Services Limited | Professional & scientific | 2014 |
| Hussain Properties London Ltd | Real estate | 2023 |
| Hussainecom Ltd | Wholesale & retail | 2025 |
| Hussayn & Co Ltd | Administrative & support | 2023 |
| Hustle Harder Honourably Ltd | Extraterritorial | 2022 |
| Hustorder Ecommerce Ltd | Wholesale & retail | 2026 |
| Hutson Property Services Ltd | Households | 2025 |
| Hutton Accommodation Ltd | Real estate | 2012 |
| Hutton Management and Property Limited | Construction | 2020 |
| Huzaifa Tariq Ltd | Wholesale & retail | 2024 |
| Hvlogistik Limited | Transport & logistics | 2016 |
| HW Property Management Limited | Real estate | 2023 |
| HWA Properties and Lettings Ltd | Real estate | 2025 |
| HWT Property Limited | Real estate | 2025 |
| Hybrid Childcare Agency Ltd | Administrative & support | 2025 |
| Hybrid Electrical Ltd | Construction | 2010 |
| Hybrid Management Solutions Ltd | Financial services | 2025 |
| Hydrogengb Limited | Manufacturing | 2025 |
| Hygienic Professional Ltd | Manufacturing | 2019 |
| Hylux Partners Limited | Administrative & support | 2026 |
| Hyperbaric Tunneling & Medical Services Ltd | Professional & scientific | 2016 |
| Hyperion Health Limited | Health & social care | 2024 |
| Hyperprior Research Ltd | Information & communication | 2022 |
| Hyrons Electrical Services Ltd | Administrative & support | 2017 |
| I & M Design Ltd | Construction | 2025 |
| I Accessories Limited | Wholesale & retail | 2023 |
| I Awow Ltd | Health & social care | 2024 |
| I C BYR Ltd | Construction | 2023 |
| I C Electrical Services Limited | Construction | 2003 |
| I DID IT Limited | Hospitality | 2025 |
| I Facilities Limited | Real estate | 2015 |
| I H Audit Limited | Information & communication | 2021 |
| I Heart U Ltd | Wholesale & retail | 2023 |
| I Home Development Ltd | Construction | 2022 |
| I I Prestige Carpentry Ltd | Manufacturing | 2023 |
| I Love Television Ltd | Information & communication | 1999 |
| I N F Building Services Ltd | Construction | 2024 |
| I O F Installation Ltd | Administrative & support | 2011 |
| I Plesu Construction Limited | Construction | 2021 |
| I Resale Ltd | Wholesale & retail | 2024 |
| I&B Ltd | Wholesale & retail | 2023 |
| I&B Solutions Ltd | Construction | 2024 |
| I&G Services Ltd | Construction | 2026 |
| I&I Construction Ltd | Construction | 2024 |
| I'Ll Mentor YOU Ltd | Administrative & support | 2020 |
| I'M Back Limited | Extraterritorial | 2020 |
| I.G.K. Building Ltd | Construction | 2025 |
| I.M. Universal Services Ltd | Construction | 2019 |
| I.M.C.S. (UK) Limited | Administrative & support | 1996 |
| I.N Style Collection Ltd | Wholesale & retail | 2025 |
| I.T. Dynamics Ltd | Construction | 2026 |
| I10 LUX Ltd | Other services | 2026 |
| I4D Consulting Ltd | Professional & scientific | 2019 |