| HS Shah Ltd | Health & social care | 2024 |
| HS Trustees Ltd | Real estate | 1989 |
| HSB4U Limited | Professional & scientific | 2015 |
| Hsbf Properties Limited | Households | 2018 |
| HSD Limited | Administrative & support | 2005 |
| Hseham Management Limited | Extraterritorial | 2024 |
| HSH2 Ltd | Hospitality | 2020 |
| HSK Global Enterprise Ltd | Hospitality | 2025 |
| HSR Physiotherapy and Health Care Limited | Health & social care | 2025 |
| HSS TN13 Ltd | Real estate | 2022 |
| HT Customz Ltd | Wholesale & retail | 2024 |
| HTM Trade Ltd | Wholesale & retail | 2014 |
| Hubbard Sheehy Associates | | 1981 |
| Hudayfah Property Limited | Real estate | 2017 |
| Hudham Consulting Ltd | Administrative & support | 2022 |
| Hudson and Kimm Block Management Limited | Households | 2019 |
| HUE Linen Ltd | Wholesale & retail | 2024 |
| Huelyco Ltd | Information & communication | 2025 |
| Hug&Soul Ltd | Information & communication | 2025 |
| Hugglescote Grange (Redrow) Management Company Limited | Households | 2021 |
| Hugmark Ltd | Construction | 2026 |
| Hujack Labmed Limited | Professional & scientific | 2019 |
| Hujjaj Ridwanulah (London) Limited | Administrative & support | 2005 |
| Hullstrap Ltd | Information & communication | 2019 |
| Human One Outsourcing Limited | Hospitality | 2010 |
| Humanforce Limited | Extraterritorial | 2017 |
| Humanitude Ltd | Other services | 2025 |
| Humano Melius Limited | Other services | 2023 |
| Humatt Limited | Wholesale & retail | 1996 |
| Humly London Limited | Administrative & support | 2001 |
| Hunayn Ltd | Manufacturing | 2024 |
| Huneewoth Solicitors Ltd | Professional & scientific | 2018 |
| Hung Manh Ltd | Wholesale & retail | 2022 |
| Hungry BEE Eats Ltd | Hospitality | 2023 |
| Hunnygoods Ltd | Wholesale & retail | 2025 |
| Hunter & GAB Limited | Professional & scientific | 2005 |
| Hunter S.A Limited | Wholesale & retail | 2015 |
| Hunter's Lodge (Redhill) Limited | Households | 2007 |
| Hunters Wharf Management Company Limited | Households | 2002 |
| Hunting Court Management Company Limited | Households | 1985 |
| Huntington Beach Energy Company Limited | Wholesale & retail | 2016 |
| Huracan Partnership Limited | Wholesale & retail | 2014 |
| Huraira Enterprises Ltd | Wholesale & retail | 2025 |
| Hurnford Close Management Company Limited | Households | 2011 |
| Hurricane Imports Limited | Administrative & support | 2004 |
| Hurriya Collective Limited | Wholesale & retail | 2023 |
| Hurstview Limited | Households | 1985 |
| Hushbox Ltd | Wholesale & retail | 2025 |
| Husky Heating Ltd | Construction | 2019 |
| Hussain 55 Limited | Real estate | 2025 |
| Hussco Group Limited | Wholesale & retail | 2023 |
| Hutchings Property Group Ltd | Construction | 2024 |
| Hutchings Property Management Limited | Real estate | 2015 |
| HVR Construction Ltd | Construction | 2024 |
| HW Lifestyle Limited | Public administration | 2019 |
| Hybrid Eco Cars Limited | Wholesale & retail | 2018 |
| Hyde & Rowe Supported Living Limited | Health & social care | 2020 |
| Hydeheath Limited | Real estate | 2021 |
| Hydeone Ltd | Information & communication | 2012 |
| Hydra Music Limited | Information & communication | 2018 |
| Hydro Cleansing Limited | Water & waste | 2000 |
| Hydrogen Systems Ltd | Information & communication | 2016 |
| Hydronylon Ltd | Wholesale & retail | 2024 |
| Hydroskin Ltd | Other services | 2025 |
| Hyena Digital Solutions Ltd | Information & communication | 2020 |
| Hyggepad Ltd | Real estate | 2025 |
| Hylands Investments Limited | Real estate | 2021 |
| Hyles Property Investments Ltd | Real estate | 2022 |
| Hynon Hire Ltd | Administrative & support | 2023 |
| Hypaskill Limited | | 1985 |
| Hyper Bazaar Limited | Administrative & support | 2018 |
| Hyperitech Limited | Information & communication | 2021 |
| Hypha Cosmetics Ltd | Manufacturing | 2015 |
| Hypi Ltd | Information & communication | 2018 |
| Hysterium Events Ltd | Hospitality | 2024 |
| I & D Building Limited | Construction | 2022 |
| I & I Properties Solutions Limited | Real estate | 2025 |
| I Accounting Pro Limited | Information & communication | 2024 |
| I AM Barbers Limited | Other services | 2025 |
| I Have Nothing - LLP | | 2024 |
| I Homely Ltd | Information & communication | 2022 |
| I Mean Business Ltd | Professional & scientific | 2024 |
| I Smash Mobile Limited | Wholesale & retail | 2023 |
| I Tennison Road RTM Company Limited | Households | 2007 |
| I YOU Print Ltd. | Administrative & support | 2013 |
| I&H London Limited | Wholesale & retail | 2017 |
| I&P Skyview Ltd | Construction | 2025 |
| I'Mpossible State of Mind Ltd | Education | 2014 |
| I.A & Co Limited | Construction | 2012 |
| I.K. Project Solutions Ltd | Professional & scientific | 2019 |
| I.L.C. & Associates Law Firm and Consulting Ltd | Professional & scientific | 2015 |
| I.R.B.C. Limited | Other services | 2014 |
| I.R.S. Group Holdings Limited | Real estate | 1999 |
| I.W.C. Estate Planning & Management Limited | Professional & scientific | 2002 |
| IA AI Ltd | Information & communication | 2025 |
| IA Financial Ltd | Financial services | 2019 |
| IAB Installation Ltd | Construction | 2026 |
| Ialysos Limited | Information & communication | 2005 |
| Iamp Healthcare Ltd | Wholesale & retail | 2020 |
| Iapetian Limited | Real estate | 2023 |