| Hide London Ltd | Wholesale & retail | 2017 |
| Hierapolis Ltd | Hospitality | 2026 |
| High Chase Mortgages Ltd | Financial services | 2021 |
| High Class Roofing & Landscaping Ltd | Construction | 2026 |
| High Flyers Property Management Ltd | Real estate | 2025 |
| High Hazel Residents Management Company Ltd | Real estate | 2021 |
| High Speed Healthcare Ltd | Hospitality | 2023 |
| High Standard Contracting Ltd | Administrative & support | 2017 |
| Highfield Place Management Company Limited | Households | 2016 |
| Hightower Care Services Ltd | Health & social care | 2015 |
| Highwood Legal Limited | Professional & scientific | 2021 |
| Hilexo Systems Ltd | Information & communication | 2019 |
| Hill Demolition Contractors Limited | Construction | 2000 |
| Hill Demolition LLP | | 2017 |
| Hill Environmental Limited | Construction | 2019 |
| Hill Metal Recycling Limited | Water & waste | 2002 |
| Hillcrest Real Estate Ltd | Real estate | 2019 |
| Hilliers Hounds Limited | Other services | 2024 |
| Hillock Limited | Financial services | 2018 |
| Hillside (Blunsdon) Management Company Limited | Households | 2018 |
| Hilltop General Practice Ltd | Health & social care | 2022 |
| Hilly Harmony Properties Limited | Real estate | 2020 |
| Hing Pets Limited | Manufacturing | 2025 |
| HIP HOP POP Ltd | Arts & recreation | 2016 |
| HIP HOP POP Schools Clubs Ltd | Administrative & support | 2016 |
| HIS Haven Ltd | Real estate | 2023 |
| HIT Cars Limited | Wholesale & retail | 2002 |
| HIT Consults Ltd | Health & social care | 2023 |
| HJC Commercial Limited | Real estate | 2024 |
| HL Display (UK) Limited | Wholesale & retail | 1987 |
| HL Display Harlow Limited | Manufacturing | 1971 |
| HL Display Leeds Limited | Manufacturing | 1988 |
| HL Display UK Holding Limited | Professional & scientific | 2009 |
| Hlts Group Limited | Hospitality | 2020 |
| HM Electrical & Facilities Ltd | Construction | 2023 |
| Hmbros Ltd | Real estate | 2024 |
| HMI Adventure Ltd | Professional & scientific | 2020 |
| HMI Legal Services Ltd | Professional & scientific | 2026 |
| HNA Supermarket Ltd | Wholesale & retail | 2025 |
| Hngr Ltd | Information & communication | 2025 |
| HNS Buy Limited | Wholesale & retail | 2024 |
| HOE Green Village (Enfield) Management Company Limited | Households | 1984 |
| HOG Construction Ltd | Extraterritorial | 1994 |
| HOG Group Limited | Wholesale & retail | 1985 |
| HOG Limited | Professional & scientific | 2000 |
| Hokmah Care Limited | Health & social care | 2025 |
| Holding Housing Limited | Real estate | 2026 |
| Holistic Angel Care Ltd | Health & social care | 2023 |
| Holistic Dimension Limited | Wholesale & retail | 2017 |
| Holisticcare@Hand Limited | Health & social care | 2025 |
| Holisticmind Care Limited | Health & social care | 2025 |
| Hollerapp Limited | Information & communication | 2025 |
| Holliday Holdings Limited | Professional & scientific | 1980 |
| Holly and Emily Limited | Public administration | 2016 |
| Holly Lodge (Windsor Lane) Management Company Ltd | Households | 2012 |
| Hollyoake Solutions Ltd | Administrative & support | 2021 |
| Holmes Durham Homes Ltd | Real estate | 2022 |
| Holmesdale Road London Management Company Limited | Households | 2013 |
| Holmzone Limited | Households | 2000 |
| Holy Cross Catholic Primary Academy | Education | 2011 |
| Home Glazing Repair Service Ltd | Construction | 2009 |
| Homeclean Hertford Limited | Households | 2016 |
| Homeliving Accommodation Ltd | Real estate | 2022 |
| Homely Home Improvements Limited | Construction | 2023 |
| Homes Just 4U Limited | Real estate | 2018 |
| Honest Flat Ltd | Administrative & support | 2020 |
| Honey Lane (Waltham Abbey) Management Company Limited | Households | 1990 |
| Honof Consulting Limited | Administrative & support | 2016 |
| HOO Express Ltd | Wholesale & retail | 2025 |
| Hope Through Dance and Movement Psychotherapy CIC | Education | 2026 |
| Hopeite Limited | Information & communication | 2021 |
| Hopidam Medical Consulting Limited | Health & social care | 2023 |
| Horncastle and Sons (Roofing) Limited | Construction | 1992 |
| Horton Green Management Company Limited | Households | 2003 |
| HOS Consultancy Ltd | Professional & scientific | 2024 |
| Hospit Ltd | Other services | 2018 |
| House Fifty Properties UK Ltd | Real estate | 2022 |
| House of Adorations Beauty & Aesthetics Ltd | Other services | 2023 |
| House of E Studio Ltd | Manufacturing | 2025 |
| House of Mason Jobs Ltd | Administrative & support | 2020 |
| House of Stone London Limited | Wholesale & retail | 2020 |
| How's My Driving Limited | Information & communication | 1995 |
| How's My Limited | Administrative & support | 1995 |
| Howards Decorators Ltd | Construction | 2020 |
| Howell & Howell Social Work Services Limited | Health & social care | 2010 |
| Howell Global Supplies Ltd | Administrative & support | 2022 |
| HP Welding Services Ltd | Manufacturing | 2020 |
| HQ Pressure Washing Ltd | Administrative & support | 2018 |
| HR Legal Support Services Ltd | Administrative & support | 2022 |
| HR4K Industries Ltd | Professional & scientific | 2020 |
| HR4K Ltd | Wholesale & retail | 2015 |
| Hrufc Trading Company Limited | Administrative & support | 2017 |
| HRW23 Limited | Financial services | 2025 |
| HSA Kitchen Management Ltd | Transport & logistics | 2019 |
| HSD PVT Ltd | Transport & logistics | 2015 |
| Hsgraceis Ltd | Information & communication | 2008 |
| Hsps Lifestyle and Wellbeing Support Services Trading AS Seniors Centres UK Ltd | Other services | 2019 |
| HTG Employees Trustees Limited | Extraterritorial | 2023 |
| HTS (Housing and Regeneration) Limited | Construction | 2018 |
| HTS (Property and Environment) Limited | Administrative & support | 2015 |