| Hughes Exterior Services Ltd | Construction | 2026 |
| Hull,Blyth(Angola)Limited | Transport & logistics | 1911 |
| HUM Cash & Carry Ltd | Wholesale & retail | 2021 |
| Human Capability Foundation | Professional & scientific | 2011 |
| Humble Consultancy Limited | Professional & scientific | 2025 |
| Humble GAS & Electric Ltd | Construction | 2025 |
| Humbled Studio Ltd | Professional & scientific | 2025 |
| Humes Avenue Garage Limited | Wholesale & retail | 2008 |
| Humming Home Ltd | Manufacturing | 2021 |
| Hummingbirds Charms Ltd | Real estate | 2022 |
| Humnees Ltd | Wholesale & retail | 2024 |
| Hundal & Sandhu Construction Limited | Construction | 2026 |
| Hundal Bricklayers Ltd | Construction | 2022 |
| Hundal Construction Ltd | Construction | 2025 |
| Hundals Logistics Ltd | Transport & logistics | 2026 |
| Hunter Glazing Limited | Construction | 2026 |
| Huntly F&B Ltd | Hospitality | 2021 |
| Hurst Computers Limited | Information & communication | 2012 |
| Hurst Solutions Ltd | Information & communication | 2024 |
| Hurstfield Investments Ltd | Real estate | 2024 |
| Husk Group Holdings Ltd | Financial services | 2026 |
| Husk Projects Ltd | Construction | 2026 |
| Huss Energy Limited | Manufacturing | 2020 |
| Hussain Prospect Limited | Hospitality | 2025 |
| Hussain'Z Group Ltd | Hospitality | 2024 |
| Hussla Limited | Wholesale & retail | 2020 |
| Hustle Mart Limited | Wholesale & retail | 2025 |
| HUT Eight Labs Ltd | Information & communication | 2022 |
| Hutton Tuition Centres Limited | Education | 2015 |
| Huttons Property Ltd | Other services | 2018 |
| HV Cheema Ltd | Real estate | 2021 |
| HV Contractor Ltd | Construction | 2025 |
| HVN Construction Ltd | Construction | 2024 |
| HWH Hub One Ltd | Arts & recreation | 2019 |
| HY Food Ltd | Hospitality | 2026 |
| Hybrid Consultancy Centre Ltd | Other services | 2018 |
| Hybrid Glazing Solutions Ltd | Manufacturing | 2023 |
| Hydronic Services Pressure Maintenance Ltd | Construction | 2025 |
| Hype Haul Ltd | Wholesale & retail | 2025 |
| Hypernest Academy Ltd | Information & communication | 2025 |
| Hyth END Stores Ltd | Wholesale & retail | 2023 |
| I AM Hamza Limited | Information & communication | 2023 |
| I AM Limitless Ltd | Information & communication | 2022 |
| I Balwinder Singh Ltd | Wholesale & retail | 2025 |
| I Enhance Ltd | Wholesale & retail | 2016 |
| I&S Prospect Construction Ltd | Administrative & support | 2022 |
| I-House Modular Ltd | Construction | 2025 |
| I-Tag Security Ltd | Administrative & support | 2018 |
| I.N Renovations Ltd | Construction | 2025 |
| IAC Building Construction Ltd | Construction | 2025 |
| IAN Chin Architects Limited | Professional & scientific | 2020 |
| IAN Webster Limited | Extraterritorial | 2024 |
| Ibdigital Ltd | Professional & scientific | 2023 |
| IBO Marketing Limited | Professional & scientific | 2025 |
| Ibusiness Technology Solutions Limited | Information & communication | 2011 |
| IC & SC Ltd | Transport & logistics | 2018 |
| Ice Accessories Limited | Administrative & support | 2006 |
| Ice Jewels Limited | Administrative & support | 2009 |
| Ice Legacy Ltd | Wholesale & retail | 2024 |
| ICM Recruitment Ltd | Transport & logistics | 2019 |
| Icon Bulding Cleaning Ltd | Administrative & support | 2026 |
| Icon Buy Limited | Wholesale & retail | 2024 |
| Iconic Kitchens & Bedrooms Ltd | Manufacturing | 2020 |
| Iconiq DMC Ltd | Administrative & support | 2024 |
| ICS Cleaning Services Limited | Other services | 2020 |
| ICY N Spicy Hayes Ltd | Hospitality | 2025 |
| Icydance Limited | Information & communication | 2026 |
| Idea Digital Marketing UK Limited | Information & communication | 2019 |
| Idea Property Limited | Real estate | 2015 |
| Ideal (UK) Construction Ltd | Construction | 2014 |
| IDK UNO Ltd | Information & communication | 2016 |
| IDS Global (UK) Ltd | Administrative & support | 2011 |
| IDY Enterprises Ltd | Construction | 2022 |
| Iexcel Claims UK Ltd | Professional & scientific | 2017 |
| Ifnan Zoom Ltd | Wholesale & retail | 2026 |
| Ifreer Ltd | Wholesale & retail | 2014 |
| IG Building Construction Limited | Construction | 2017 |
| IGS Builders Ltd | Construction | 2022 |
| IGZ Limited | Construction | 2019 |
| IHA Bedrooms & Kitchens Ltd | Manufacturing | 2024 |
| III Property Solutions Ltd | Real estate | 2023 |
| IIT Services Limited | Wholesale & retail | 2018 |
| IJ Mobile N Vapes Limited | Wholesale & retail | 2023 |
| Ijaz Khan Ltd | Construction | 2025 |
| Ikash Transport Limited | Transport & logistics | 2024 |
| IKG Consultancy Ltd | Professional & scientific | 2023 |
| Ikhlaas Halal Meat Ltd | Wholesale & retail | 2021 |
| Ikhlaas Supermarket Hayes Ltd | Wholesale & retail | 2017 |
| IKR Driving School Limited | Education | 2020 |
| Ilio Galletti Ltd | Transport & logistics | 2024 |
| Illume Hotels Ltd | Real estate | 2025 |
| Ilyasm Commerce Ltd | Wholesale & retail | 2026 |
| Ilyfe Limited | Extraterritorial | 2022 |
| IM Consulting Group Ltd | Real estate | 2024 |
| Imaarat Ltd | Construction | 2025 |
| Imasb Limited | Wholesale & retail | 2024 |
| Immakulate Ltd | Real estate | 2019 |
| Immanuel Constructions Ltd | Construction | 2019 |
| Immigrant Contractor Ltd | Construction | 2025 |
| IMN Motors Ltd | Wholesale & retail | 2020 |