| Henry Brothers Property Holdings Ltd | Real estate | 2026 |
| Herons Rise Properties Ltd | Households | 2018 |
| Hexcelpack (UK) Limited | Wholesale & retail | 2019 |
| HF Care Limited | Health & social care | 2017 |
| HFM Estates Ltd | Real estate | 2021 |
| HFM Performance Partners Ltd | Professional & scientific | 2025 |
| HFM Property Group Ltd | Real estate | 2025 |
| Hhtl Ltd | Real estate | 2024 |
| Hi-Tech Limited | Extraterritorial | 2008 |
| Hidden Corner Consultancy Limited | Information & communication | 2015 |
| Highs & Lows Ltd | Information & communication | 2025 |
| Highworth Services Ltd | Hospitality | 2024 |
| Higsuk Ltd | Wholesale & retail | 2020 |
| Hillcrest Wines Limited | Agriculture & fishing | 2015 |
| Hilton Energy and Thermal Technology Limited | Extraterritorial | 1994 |
| Hindle Coaching Ltd | Arts & recreation | 2024 |
| Hindsight Solutions Limited | Professional & scientific | 2013 |
| Hines Commercial Catering Solutions Ltd | Manufacturing | 2025 |
| Hinnovations Limited | Information & communication | 2015 |
| Hippo Campers Ltd | Wholesale & retail | 2018 |
| Hireheat Ltd | Administrative & support | 2019 |
| Hive Investments London Limited | Other services | 2016 |
| Hixon-Stainton-Tanner Trust | Education | 1963 |
| HJ Phillips Electrical Ltd | Construction | 2026 |
| HJI Foods Limited | Hospitality | 2013 |
| HJT Property Investments Ltd | Real estate | 2026 |
| Hjtr Consulting Ltd | Professional & scientific | 2023 |
| HLB Solutions Ltd | Professional & scientific | 2019 |
| HLH Accountacy Ltd | Professional & scientific | 2024 |
| HMG Coatings (South) Limited | Other services | 1987 |
| HMS Homes Hampshire Limited | Real estate | 2025 |
| Hobbs MEP Consulting Engineers Ltd | Administrative & support | 2022 |
| Holberg Limited | Financial services | 1998 |
| Holdsworth Aviation Ltd | Professional & scientific | 2026 |
| Holdsworth Interactives Ltd | Arts & recreation | 2022 |
| Holy Angels Health Care Ltd | Health & social care | 2024 |
| Home Decor 2025 Limited | Wholesale & retail | 2025 |
| Home Farm (Quarley) Limited | Agriculture & fishing | 1964 |
| Home Techfy Ltd | Wholesale & retail | 2024 |
| Homesfix Limited | Construction | 2025 |
| Hookafly Ltd | Education | 2026 |
| Hooked on Polo Ltd. | Arts & recreation | 2011 |
| Hookwood Properties Ltd | Real estate | 2020 |
| Hope Falcons Ltd | Agriculture & fishing | 2017 |
| Hoppy Pets Ltd | Wholesale & retail | 2022 |
| Hospital in a Box Ltd | Administrative & support | 2012 |
| Hospitality Professionals Ltd | Manufacturing | 2019 |
| House BEE Cleaning Company Ltd | Administrative & support | 2019 |
| House of Perfection Amesbury Ltd | Other services | 2026 |
| House Pringle Ltd | Real estate | 2023 |
| House Telemedia Ltd | Information & communication | 2010 |
| Houzen Limited | Information & communication | 2023 |
| Howard Contracting Ltd | Wholesale & retail | 2021 |
| Hpeventing Limited | Administrative & support | 2014 |
| HRV Fit Limited | Information & communication | 2009 |
| HS Canine Hydrotherapy Ltd | Professional & scientific | 2025 |
| HSA Property Maintenance Services Ltd | Construction | 2024 |
| HSB Aviation Consulting Ltd | Administrative & support | 2015 |
| HSB International Aviation Consulting Limited | Other services | 2021 |
| HSG Developments Ltd | Real estate | 2024 |
| HT24 Property Ltd | Real estate | 2024 |
| Hudson Cable Management Group Limited | Construction | 2020 |
| Hued Visuals Ltd | Professional & scientific | 2025 |
| Hull Construction Ltd | Construction | 2019 |
| Hulme Davies Limited | Administrative & support | 2025 |
| Human Capital Development Limited | Professional & scientific | 2003 |
| Humble Profits Limited | Wholesale & retail | 2025 |
| Hummingbird-Tours Ltd | Administrative & support | 2024 |
| Humphrey & Crockett Ltd | Construction | 2011 |
| Hunnies Afro Beauty Ltd | Wholesale & retail | 2025 |
| Huntson Strategic Consultancy Ltd | Administrative & support | 2026 |
| Hurst Heating & Plumbing Ltd | Construction | 2017 |
| Hurstbourne Forge Ltd | Manufacturing | 2020 |
| Hutch Solutions Limited | Information & communication | 2018 |
| HW Management Limited | Households | 2019 |
| Hybrid Creative Limited | Professional & scientific | 2008 |
| Hydra-Air Limited | Wholesale & retail | 2006 |
| Hydro Leisure Plus Limited | Construction | 2021 |
| Hysons Accountants LLP | | 2014 |
| Hysons Audit Services Ltd | Professional & scientific | 2023 |
| I & a Property Management Ltd | Real estate | 2025 |
| I M Accident Repair Centre Ltd | Wholesale & retail | 2016 |
| I M Asset Property Ltd | Real estate | 2025 |
| I2T2 Ltd | Administrative & support | 2018 |
| I4 Design Consultants Limited | Professional & scientific | 1995 |
| Icandy Design Limited | Information & communication | 2003 |
| Icid Limited | Agriculture & fishing | 1993 |
| Idea Incorporated Limited | Professional & scientific | 2021 |
| Idea Reality Ltd | Professional & scientific | 2013 |
| Ideaplus Limited | Wholesale & retail | 1998 |
| Idmsc UK Limited | Professional & scientific | 2016 |
| IJR Casa Ltd | Real estate | 2024 |
| Ikemdinachi Limited | Health & social care | 2021 |
| Ikonet Limited | Information & communication | 2007 |
| Illusion Events Group Limited | Administrative & support | 2022 |
| Impulse Automation Limited | Wholesale & retail | 1960 |
| Inception Development Consultancy Limited | Professional & scientific | 2021 |
| Inception Developments (South Wonston) Ltd | Professional & scientific | 2025 |
| Independent Sales Technologies Limited | Professional & scientific | 2009 |
| Indexone Technologies Limited | Wholesale & retail | 2022 |