| Homeland Design & Build Limited | Construction | 2024 |
| Homelea Management Limited | Real estate | 1999 |
| Homeleigh Apartments Limited | Households | 2015 |
| Homeless Eats Ltd | Hospitality | 2018 |
| Homelien Ltd | Wholesale & retail | 2025 |
| Homeprop Ltd | Information & communication | 2025 |
| Homes by Cafer Ltd | Real estate | 2026 |
| Homestead DAE Lettings Ltd | Real estate | 2026 |
| Honest Building & Construction Ltd | Construction | 2022 |
| Honest UK Beauty Limited | Wholesale & retail | 2025 |
| Honey Lane Limited | Other services | 2006 |
| Honey Moon and Events Management Ltd | Other services | 2025 |
| Honor Rose Brickwork Ltd | Other services | 2018 |
| Hooked Creative Limited | Information & communication | 2021 |
| Hookings Mastics Limited | Construction | 1989 |
| Hooky ST Coffee Co Limited | Hospitality | 2018 |
| Hooray Films Ltd | Arts & recreation | 2024 |
| Hooritsu Ltd | Professional & scientific | 2015 |
| Hoowood Limited | Information & communication | 2015 |
| Hope Ambassadors Children's Support Service Ltd | Administrative & support | 2026 |
| Hope Ambassadors Children’S Homes Ltd | Health & social care | 2025 |
| Hope Homes London Ltd | Health & social care | 2025 |
| Hope Mirvex Ltd | Wholesale & retail | 2026 |
| Hopeagain Counselling and Mentoring Services Limited | Other services | 2022 |
| Hopson & Co Consulting Limited | Extraterritorial | 2022 |
| Hopson & Co Management and Maintenance Limited | Real estate | 2020 |
| Horace Investments Ltd | Wholesale & retail | 2020 |
| Horasti Plumbing Ltd | Construction | 2018 |
| Horatio Property Management Limited | Construction | 2017 |
| Horizon Healthcare Services Ltd | Health & social care | 2020 |
| Horizon Installation Limited | Construction | 2019 |
| Horizont Solutions Ltd | Information & communication | 2019 |
| Horodnic Construction Ltd | Construction | 2020 |
| Horrizen Ltd | Administrative & support | 2016 |
| Horse Haylo Ltd | Wholesale & retail | 2025 |
| Hortico Group Ltd | Administrative & support | 2019 |
| Hospitality Insight Ltd | Administrative & support | 2025 |
| Hospiva Care & Associates Agency Ltd | Health & social care | 2016 |
| Host Inn Ltd | Real estate | 2024 |
| Hot & Tasty London UK Ltd | Hospitality | 2024 |
| Hot Feet Limited | Information & communication | 2015 |
| Hot UK Discounts Ltd | Wholesale & retail | 2021 |
| Hot Water and Central Heating Limited | Construction | 2009 |
| Hotel Interior Logistics Limited | Administrative & support | 2019 |
| Hotwheelzz Ltd | Wholesale & retail | 2025 |
| Houghton COX Limited | Administrative & support | 2017 |
| Hounslow Language Service Ltd | Education | 2010 |
| House 2025 Ltd | Real estate | 2025 |
| House of Accounting Ltd | Professional & scientific | 2020 |
| House of DSF Ltd | Wholesale & retail | 2020 |
| House of Fundamentals Sports Academy Ltd | Education | 2023 |
| House of Grey Company Ltd | Administrative & support | 2021 |
| House of Kings Creations Ltd | Wholesale & retail | 2026 |
| House of Lembalemba Mubanga (Holm) Ltd | Financial services | 2026 |
| House of MM Ltd | Other services | 2022 |
| House of Motors Ltd | Wholesale & retail | 2013 |
| House of Nathan Ltd | Real estate | 2024 |
| House of Paws (Essex) Ltd | Other services | 2022 |
| House of Peltier Ltd | Wholesale & retail | 2024 |
| House of Professionals Limited | Professional & scientific | 2010 |
| House of Rapha Ltd | Wholesale & retail | 2024 |
| House of Tuesday Ltd | Construction | 2014 |
| Housing Corp Ltd | Real estate | 2017 |
| Houz FIX Limited | Construction | 2025 |
| Houzzbiz Ltd | Real estate | 2020 |
| Howes Your Drains Ltd | Water & waste | 2024 |
| Hoxha Unity Electrics Ltd | Construction | 2024 |
| Hoxha Unity Real Estates Ltd | Real estate | 2025 |
| HOY Automatic Door Systems Ltd | Manufacturing | 2015 |
| Hozar QI Ltd | Wholesale & retail | 2025 |
| Hpc.Transport Ltd | Manufacturing | 2025 |
| HPM Construction Group Limited | Construction | 2016 |
| HPM Electrical Ltd | Construction | 2023 |
| HPM Maintenance Solutions Ltd | Households | 2023 |
| HPM Resources Limited | Construction | 2018 |
| HQ Care Ltd | Health & social care | 2025 |
| Hqpro Ltd | Transport & logistics | 2018 |
| Hqureshi Limited | Wholesale & retail | 2023 |
| HR Amber Cars Ltd | Transport & logistics | 2022 |
| HR Amber Taxis Ltd | Transport & logistics | 2022 |
| HR London Plumbers Limited | Construction | 2022 |
| HR Provision Ltd | Professional & scientific | 2026 |
| HRA Motors Ltd | Wholesale & retail | 2024 |
| Hraaaridehailing Ltd | Transport & logistics | 2026 |
| HRC Estate Ltd | Real estate | 2016 |
| HRC Marketing Ltd | Professional & scientific | 2019 |
| HRC Property Co Limited | Real estate | 2012 |
| HRH Belgravia Ltd | Health & social care | 2022 |
| Hrjn Consultancy Limited | Information & communication | 2016 |
| HRS Electrical Team Limited | Construction | 2015 |
| Hrsm Properties Ltd | Real estate | 2020 |
| Hrsupplygroup Ltd | Wholesale & retail | 2024 |
| HRV Construction Limited | Construction | 2024 |
| HS Electrical Contractors Ltd | Construction | 2015 |
| HS Food Service (UK) Limited | Wholesale & retail | 2025 |
| HS Lands Ltd | Construction | 2023 |
| HS Real Estate Management Ltd | Real estate | 2024 |
| HS Rentals Ltd | Real estate | 2019 |
| HSB Mass Construction Ltd | Construction | 2015 |
| HSB Mass Ltd | Construction | 2022 |