| Homes Countrywide Limited | Real estate | 1998 |
| Homespace Properties Ltd | Real estate | 2019 |
| Homestyle Residents Co. Limited | Real estate | 1988 |
| Honesta Inc. Ltd | Wholesale & retail | 2024 |
| Honeycomb Property Services Limited | Real estate | 2020 |
| Honeymix Foodco Limited | Manufacturing | 2024 |
| Honeypot Joinery Limited | Construction | 2011 |
| Hooda Consultancy Services Limited | Professional & scientific | 2017 |
| Hook Scenic Ltd | Construction | 2014 |
| Hoos Technology Ltd | Information & communication | 2014 |
| Hope Homecare Holdings Limited | Administrative & support | 2023 |
| HOPES4US Management and Investing Limited | Professional & scientific | 2025 |
| Horizonx Media Limited | Administrative & support | 2023 |
| Horsepower Hairdressing Limited | Administrative & support | 2006 |
| Horton Auto Service Centre Limited | Wholesale & retail | 2022 |
| Hot Box Chicken Ltd | Hospitality | 2018 |
| Hot Express Pizza Ltd | Hospitality | 2025 |
| Hot TUB Response Ltd | Other services | 2019 |
| Hot Yoga House Limited | Arts & recreation | 2023 |
| Hotstepper Songs Limited | Information & communication | 2023 |
| Hour of Power Ltd | Wholesale & retail | 2009 |
| Hourdeal Limited | Administrative & support | 2024 |
| House 76 MB Limited | Other services | 2015 |
| House of Aevum Ltd | Wholesale & retail | 2025 |
| House of Decor Nimsay Limited | Wholesale & retail | 2017 |
| House of DEV Aditya Ltd | Professional & scientific | 2022 |
| House of Properties Intl Ltd | Real estate | 2021 |
| House of Spencer London Limited | Wholesale & retail | 2026 |
| Houston & Hawkes Ltd | Hospitality | 2019 |
| HOW Wood Management Limited | Households | 1991 |
| Howard Dean Car Sales Ltd | Wholesale & retail | 2017 |
| Howarth (Fifield) Limited | Real estate | 2026 |
| Howarth Contractors (Ascot) Limited | Real estate | 2025 |
| Howarth Contractors Bedmond Limited | Real estate | 2026 |
| Howarth Homes (Codicote) Limited | Construction | 2025 |
| Howarth Land & Planning Limited | Real estate | 2025 |
| Howarth Property Ltd | Real estate | 2019 |
| Howitzer Acquisition Limited | Financial services | 2006 |
| HP Living Ltd | Real estate | 2020 |
| Hpefix Ltd | Construction | 2023 |
| HPR Automotives Limited | Wholesale & retail | 2024 |
| HPV Ltd | Real estate | 2012 |
| HQ Prep Ltd | Transport & logistics | 2021 |
| Hrbility Limited | Information & communication | 2023 |
| HRC Building Ltd | Construction | 2024 |
| HRG Fisheries Ltd | Hospitality | 2025 |
| HRH Drylining Ltd | Construction | 2025 |
| Hrias UK Ltd | Education | 2022 |
| Hristopolis Ltd | Administrative & support | 2009 |
| HRM Joinery Ltd | Manufacturing | 2020 |
| HS Electrics Ltd | Construction | 2014 |
| HSB Design and Build Limited | Construction | 2020 |
| HSH Accounting Limited | Professional & scientific | 2022 |
| HSI Aesthetics Ltd | Other services | 2024 |
| Hsingh Builders Ltd | Construction | 2020 |
| HSN Renovations Ltd | Construction | 2023 |
| HSP Partners Limited | Construction | 2015 |
| HSS Assets Limited | Real estate | 2019 |
| HTC Global Services (UK) Private Limited | Information & communication | 2005 |
| HTR Care and Recruitment Limited | Administrative & support | 2017 |
| HTR Supported Accommodation Limited | Health & social care | 2022 |
| HTR Supported Living Limited | Health & social care | 2022 |
| Hu-Ed Ltd | Health & social care | 2007 |
| Hudson & Mccullum Limited | Professional & scientific | 2013 |
| Hudson Court (Dunstable) Management Company Limited | Households | 2011 |
| Hudson Marshall Solicitors Limited | Professional & scientific | 2017 |
| Hulubre Ltd | Information & communication | 2021 |
| Hunjan Corp Ltd | Real estate | 2022 |
| Hunt Saboteurs Association Limited | Other services | 1990 |
| Hunter Johnson Ltd | Wholesale & retail | 2024 |
| Hunton House Limited | Hospitality | 2017 |
| Huntsmans Lodge Limited | Health & social care | 2003 |
| Husle Ltd | Wholesale & retail | 2025 |
| HUSO27 Ltd | Hospitality | 2025 |
| Hussein Ahmadi Ltd | Wholesale & retail | 2025 |
| Huston Connection Limited | Extraterritorial | 1998 |
| Hutton Lighting Ltd | Construction | 2012 |
| Huxan Holdings Ltd | Wholesale & retail | 2023 |
| HXL Construction Ltd | Construction | 2023 |
| Hybrid PCO Cars Limited | Administrative & support | 2015 |
| Hydrophilic Ltd | Manufacturing | 2017 |
| Hygienic and Environmental Engineering Services Limited | Professional & scientific | 1990 |
| Hyland & Co Designs Limited | Professional & scientific | 2023 |
| Hyperequity Limited | Financial services | 2023 |
| Hyperion Professional Services Limited | Other services | 2023 |
| Hyproc International Ltd | Wholesale & retail | 2016 |
| HZ Accounting Ltd | Professional & scientific | 2026 |
| I & I Associates Limited | Information & communication | 2008 |
| I EMI Limited | Construction | 2018 |
| I FIX Zone Ltd | Wholesale & retail | 2017 |
| I K Marbay Limited | Health & social care | 2015 |
| I Tiffin Limited | Hospitality | 2017 |
| I&A Hub Ltd | Hospitality | 2026 |
| I&M Holdco Limited | Financial services | 2019 |
| I&O Construction Ltd | Construction | 2019 |
| I-Access Care Ltd | Health & social care | 2024 |
| IA Capital Investments Ltd | Wholesale & retail | 2024 |
| IAK Kocev Ltd | Transport & logistics | 2022 |
| IB Developments Limited | Construction | 2011 |
| Ibariego Investment Ltd | Real estate | 2022 |