| Hoopguy Limited | Wholesale & retail | 2007 |
| HOP in Shop 1 Ltd | Wholesale & retail | 2026 |
| Hopkins Accountants Limited | Professional & scientific | 2015 |
| Hoppy Toad Limited | Information & communication | 2026 |
| Horen Limited | Manufacturing | 2016 |
| Horeston Motors Limited | Wholesale & retail | 2012 |
| Horeston Subs Ltd | Wholesale & retail | 2023 |
| Horiba Mira Certification Limited | Professional & scientific | 2011 |
| Horizon Auto Group Ltd | Wholesale & retail | 2026 |
| Horizontal Homes Limited | Real estate | 2024 |
| Hornsey Rise (Wellsborough) Management Company Limited | Households | 2021 |
| Horsley Brook Farms Ltd | Agriculture & fishing | 2015 |
| Horton Manufacturing Service Limited | Administrative & support | 2015 |
| Hot to the Touch Events Ltd. | Hospitality | 2022 |
| Hours of Flowers Limited | Wholesale & retail | 2002 |
| House of Beauty Academy Warwickshire Ltd | Other services | 2024 |
| House of Harper Design Limited | Professional & scientific | 2022 |
| House of Healing Collective CIC | Health & social care | 2025 |
| House of Healing Ltd | Administrative & support | 2025 |
| House of Kabeer Ltd | Wholesale & retail | 2025 |
| House of Tigers Dance Company Ltd | Arts & recreation | 2025 |
| House of Tynes Ltd | Administrative & support | 2025 |
| Housescan Ltd | Construction | 2017 |
| Howard Legacy Limited | Construction | 2024 |
| Howley Energy & Water Limited | Construction | 2017 |
| HOZ Trading Limited | Transport & logistics | 2026 |
| Hpsk Investment Group Limited | Real estate | 2021 |
| HR & Co Consulting Ltd | Administrative & support | 2022 |
| Hrkz Ltd | Wholesale & retail | 2025 |
| HS Group Constructions Ltd | Construction | 2023 |
| Htcc Vehicle Sales and Hire Ltd | Wholesale & retail | 2018 |
| HTH Nails Beauty Ltd | Other services | 2026 |
| Http Property Ltd | Real estate | 2024 |
| Hudson's B and B Ltd | Hospitality | 2026 |
| Huggys Speedshop Limited | Wholesale & retail | 2013 |
| Hughes Online Solutions Ltd | Administrative & support | 2016 |
| Huihua Ltd | Wholesale & retail | 2020 |
| HUK Group Clothing Ltd | Wholesale & retail | 2018 |
| HUK Group Ltd | Manufacturing | 2003 |
| Hukam Ventures Ltd | Real estate | 2026 |
| Hula ENT Ltd | Financial services | 2022 |
| Hula Hospitality Limited | Hospitality | 2022 |
| Hula Ventures Ltd | Hospitality | 2025 |
| Human Touch Rehabilitation Ltd | Health & social care | 2023 |
| Hunt's Prep Solutions Ltd | Wholesale & retail | 2025 |
| Hunted Homes Direct Ltd | Construction | 2019 |
| Huntingdon Road Flat Management Limited | Households | 2007 |
| Hurain Ltd | Wholesale & retail | 2025 |
| Hush D D Ltd | Construction | 2022 |
| HUX Ltd | Transport & logistics | 2010 |
| Hvarth Consulting Limited | Professional & scientific | 2002 |
| HW Clinpharm Ltd | Professional & scientific | 2018 |
| Hyderabadi Biryani Point Limited | Hospitality | 2025 |
| Hydro Concepts Ltd | Construction | 2024 |
| Hydro Voltz Ltd | Construction | 2026 |
| Hydromap Geomatics Ltd | Professional & scientific | 2021 |
| Hygieia Clean Ltd | Administrative & support | 2025 |
| Hynca Consulting Ltd | Information & communication | 2026 |
| Hynca Financial Ltd | Financial services | 2025 |
| Hynca Holdings Ltd | Financial services | 2025 |
| Hyper Competitions Limited | Information & communication | 2025 |
| I & N Fashions Limited | Manufacturing | 2011 |
| I K Piling Limited | Construction | 2015 |
| I Love Parcels Ltd | Wholesale & retail | 2019 |
| I Smith Engineering Limited | Manufacturing | 1997 |
| I.A.H. Transport Ltd | Transport & logistics | 2018 |
| I.F Fire Limited | Construction | 2022 |
| Iain Mackenzie Ltd | Education | 2024 |
| IAN Corden QA Inspection Ltd | Professional & scientific | 2015 |
| IAN Ellis Composites Ltd | Professional & scientific | 2025 |
| IAN Spedition Ltd | Transport & logistics | 2019 |
| Ian's Luxury Coaches Limited | Transport & logistics | 1992 |
| IAP Properties Ltd | Real estate | 2025 |
| IAP Team Ltd | Professional & scientific | 2026 |
| ICF Agent Limited | Professional & scientific | 2023 |
| ICL Plant Hire Ltd | Construction | 2004 |
| Icon Installations Limited | Construction | 2007 |
| Icon Properties (Mids) Ltd | Real estate | 2014 |
| Ideal Integrated Farming Limited | Wholesale & retail | 2020 |
| Ideal Stores Limited | Wholesale & retail | 2018 |
| Idiada Automotive Technology UK Ltd. | Wholesale & retail | 2011 |
| Idmg Properties Ltd | Construction | 2025 |
| Idrive Car Sales Ltd | Wholesale & retail | 2019 |
| IDV Defence Vehicles UK Ltd | Professional & scientific | 2022 |
| IH Mowing Limited | Other services | 2015 |
| Iherba Ltd | Wholesale & retail | 2021 |
| IJR Residential Limited | Real estate | 2019 |
| Illam Design and Build Limited | Professional & scientific | 2025 |
| Imaginax Limited | Extraterritorial | 2012 |
| Imagine (UK) Ltd | Real estate | 2000 |
| Imagine House Rents Limited | Real estate | 2015 |
| Imagine US Ltd | Hospitality | 2022 |
| Imej Holdings Limited | Financial services | 2024 |
| Impact Boxing and Fitness Gym Ltd | Arts & recreation | 2019 |
| Impact Flooring Limited | Extraterritorial | 2010 |
| Impact Flooring Services Limited | Construction | 2000 |
| Impact Industrial Flooring Limited | Extraterritorial | 2015 |
| IMT Associates Ltd | Professional & scientific | 2018 |
| IN Control GAS Services Limited | Other services | 2016 |
| In-Situ Properties Ltd | Extraterritorial | 2024 |