| Honeywells Consulting Limited | Professional & scientific | 2014 |
| Honky Tonk Limited | Administrative & support | 2006 |
| Honnao Ltd | Wholesale & retail | 2019 |
| Honor Management Limited | Other services | 2009 |
| HOO Group Limited | Professional & scientific | 2026 |
| Hood Lessons Limited | Education | 2023 |
| Hooves and Happiness Equine Centre Ltd | Agriculture & fishing | 2025 |
| Hope & Anchor (Ross-On-Wye) Limited | Hospitality | 2020 |
| Hope and Frenchie Ltd | Wholesale & retail | 2018 |
| Hope Homecare Franchise Limited | Health & social care | 2019 |
| Hope Homecare Group Limited | Professional & scientific | 2018 |
| Hope Homecare Services (Harlow) Limited | Health & social care | 2021 |
| Hope Homecare Services Limited | Health & social care | 2013 |
| Hope Transportation Services Limited | Transport & logistics | 2021 |
| Hopscotch Scenic Limited | Professional & scientific | 2012 |
| Hopscotch Trading Limited | Wholesale & retail | 2009 |
| Hopspot Ltd | Hospitality | 2025 |
| Horder Limited | Extraterritorial | 2009 |
| Horizon Charter Limited | Manufacturing | 2010 |
| Horizon Children Homes Ltd | Health & social care | 2024 |
| Horizon Digital Holdings Ltd | Financial services | 2026 |
| Horizon Integrated Rehabilitation Ltd | Health & social care | 2016 |
| Horizon Law Limited | Professional & scientific | 2009 |
| Horn Advisory Services Limited | Professional & scientific | 2004 |
| Hornbeam Estates Limited | Real estate | 2018 |
| Hornchurch Pathology Services Ltd | Health & social care | 2017 |
| Horsham Chiropractic Centre Ltd | Health & social care | 2003 |
| Hospandhomecare Limited | Health & social care | 2013 |
| Host LDN Ltd | Hospitality | 2018 |
| Hot POT Camden Ltd | Hospitality | 2019 |
| Hotdeck Limited | Information & communication | 2025 |
| Hotears Limited | Administrative & support | 2009 |
| Hotel Apart Limited | Hospitality | 2020 |
| Hotel I Limited | Hospitality | 2003 |
| Hotelsbuddy Hospitality Services Limited | Other services | 2018 |
| Houfu Limited | Health & social care | 2023 |
| House Lettings Agency Ltd | Real estate | 2023 |
| House Maintenance Ltd | Construction | 2012 |
| House of Aesthetics Ltd | Other services | 2024 |
| House of Azure Limited | Health & social care | 2025 |
| House of B Design Ltd | Professional & scientific | 2010 |
| House of Burger Bear Ltd | Hospitality | 2014 |
| House of Candy Floss Limited | Wholesale & retail | 2001 |
| House of Creative London Limited | Administrative & support | 2020 |
| House of SUL Limited | Wholesale & retail | 2023 |
| House of Vibranium Ltd | Extraterritorial | 2024 |
| Hovnan & Co Ltd | Professional & scientific | 2011 |
| Howland Cost Consultants Limited | Professional & scientific | 2025 |
| Howun (2010) Limited | Extraterritorial | 2010 |
| Howun Limited | Real estate | 1997 |
| Hoxton Street Property Investment Limited | Real estate | 2014 |
| HP Consulting (UK) Limited | Administrative & support | 2003 |
| HP Crystal Nails Ltd | Other services | 2025 |
| HP Office Solutions Limited | Public administration | 2013 |
| HR & SR Properties Limited | Financial services | 2026 |
| HRG Management Ltd | Other services | 2012 |
| HRH Consultants Ltd | Professional & scientific | 2014 |
| HRM Property Ltd | Real estate | 2019 |
| HS Employees Trustees Limited | Extraterritorial | 2021 |
| HT Prosperity Limited | Hospitality | 2022 |
| HU Breath Limited | Arts & recreation | 2016 |
| Huang FIX Ltd | Construction | 2011 |
| Huatong Limited | Administrative & support | 2013 |
| Huddersfield Capital Ltd | Hospitality | 2025 |
| Huddle Cafe Limited | Hospitality | 2019 |
| Hudson Management Limited | Administrative & support | 2005 |
| Hudson Motor Sales Ltd | Wholesale & retail | 2021 |
| Hudson Property and Construction Limited | Other services | 2020 |
| Humainly Ltd | Information & communication | 2026 |
| Human Development Limited | Administrative & support | 1996 |
| Human Dignity Projects Ltd | Administrative & support | 2022 |
| Human Economics Limited | Professional & scientific | 2019 |
| Humans I Trust Limited | Professional & scientific | 2017 |
| Hunsdon Management (Wicklands RD) Limited | Households | 2018 |
| Huntrix Properties Ltd | Real estate | 2026 |
| Huriya Film Limited | Information & communication | 2023 |
| Hurrykeep Limited | Wholesale & retail | 1990 |
| Hush Telematics Ltd | Information & communication | 2018 |
| Hutson Properties Limited | Real estate | 2026 |
| HVN Media Ltd | Information & communication | 2023 |
| Hwdw Limited | Real estate | 2016 |
| HWJ Ltd | Manufacturing | 2012 |
| HWR Partners Ltd | Real estate | 2026 |
| HXH Plant Ltd | Construction | 2024 |
| Hyacinth Studios Ltd | Wholesale & retail | 2024 |
| Hydra Umbrella Limited | Financial services | 2022 |
| Hydra Vodka Company Limited | Manufacturing | 2021 |
| Hydro Glow Works Ltd | Wholesale & retail | 2018 |
| Hydrogen Safe Limited | Education | 2023 |
| Hydron Real Estate Limited | Real estate | 2024 |
| Hypco Holdings Limited | Financial services | 2025 |
| Hythe Self Storage Ltd | Transport & logistics | 2025 |
| I - NO Limited | Information & communication | 1999 |
| I Heart Studios Group Ltd | Financial services | 2020 |
| I Heart Studios Ltd | Professional & scientific | 2020 |
| I Heart Studios Services Limited | Professional & scientific | 2020 |
| I K Legal Limited | Professional & scientific | 2011 |
| I Kandi Fashion & Design Limited | Wholesale & retail | 2004 |
| I Love Coats Ltd | Wholesale & retail | 2018 |
| I&H Property Services UK Ltd | Real estate | 2017 |