| Happy Healthy Teeth Ltd | Health & social care | 2012 |
| Happy Homes Letting & Real Estate Ltd | Real estate | 2026 |
| Happy Nail Bar Ltd | Other services | 2023 |
| Happy Sophie Ltd | Wholesale & retail | 2020 |
| Harbot's Limited | Financial services | 1936 |
| Harbour Tree Care Services Ltd | Agriculture & fishing | 2014 |
| Harcourt Realty Limited | Financial services | 1988 |
| Hardline Recovery Limited | Transport & logistics | 2026 |
| Hardy GAS Services Ltd | Construction | 2006 |
| Hardy's School Photography Ltd | Professional & scientific | 2019 |
| Hare Investments Limited | Households | 2018 |
| Harell Ltd | Wholesale & retail | 2022 |
| Harlow Bros Holdings Limited | Wholesale & retail | 2011 |
| Harlow Bros. Limited | Manufacturing | 1967 |
| Harlow Machine & Repair Ltd | Manufacturing | 2025 |
| Harlow Pension Trustees Limited | Extraterritorial | 2013 |
| Harlow Timber Group Limited | Financial services | 2021 |
| Harlow Timber Group Trustees Limited | Administrative & support | 2022 |
| Harlow Timber Systems (Eastern) Limited | Wholesale & retail | 1977 |
| Harlow Timber Systems Ltd. | Manufacturing | 1984 |
| Harlows Kidderminster LLP | | 2007 |
| Harmony Florals Limited | Wholesale & retail | 2023 |
| Harmony Hub Education Ltd | Education | 2026 |
| Harmony Massage Therapy Ltd | Health & social care | 2025 |
| Harper Crescenzo Bars Ltd | Hospitality | 2024 |
| Harpy Ltd | Wholesale & retail | 2018 |
| Harris Hard Landscaping Limited | Administrative & support | 2022 |
| Harrisons Spice Takeaway (Mountsorrel) Ltd | Hospitality | 2026 |
| Harrowden Estates Limited | Real estate | 2012 |
| Harry Bruce Building and Maintenance Services Ltd | Manufacturing | 2023 |
| Hartal Bodies Limited | Wholesale & retail | 2007 |
| Harvey Valentines Limited | Manufacturing | 2023 |
| HAS Technology Limited | Professional & scientific | 2006 |
| Hastings Green Management Company Limited | Households | 2022 |
| Hathern & Charnwood Coffee Roasters Ltd | Wholesale & retail | 2025 |
| Hathern Events CIC | Arts & recreation | 2018 |
| Hatj Holdings Limited | Financial services | 2022 |
| Haunted Finders Productions Limited | Professional & scientific | 2024 |
| Haus Revive Ltd | Real estate | 2025 |
| Hauze Ltd | Information & communication | 2025 |
| Havana Salsa Dance Tours Ltd | Administrative & support | 2016 |
| Havana Salsa Events Limited | Arts & recreation | 2023 |
| Havana Salsa Holdings Limited | Professional & scientific | 2017 |
| Havana Salsa UK Ltd | Arts & recreation | 2014 |
| Haven Certificates Ltd | Professional & scientific | 2021 |
| Haven Shores Ltd | Health & social care | 2026 |
| Hawes Electrical Limited | Construction | 2005 |
| Hawker Siddeley Switchgear Limited | Manufacturing | 1941 |
| Hawksfield Ltd | Professional & scientific | 2024 |
| Hawley and Rodgers LLP | | 2019 |
| Haycock Technical Services Ltd | Information & communication | 2008 |
| Haydock Project Limited | Arts & recreation | 2024 |
| Hayes and Old School House Limited | Health & social care | 2021 |
| Hayley Hammond Architects Ltd | Professional & scientific | 2017 |
| Haysford Properties Limited | Real estate | 2015 |
| Hayward & Weston Investments Ltd | Financial services | 2021 |
| Hayward Exclusive Homes (Properties) Limited | Extraterritorial | 2007 |
| Hayward Exclusive Homes Limited | Construction | 2001 |
| Haze Holdings Limited | Real estate | 2026 |
| Hazel Kitchen Limited | Hospitality | 2025 |
| HBR Estates Limited | Construction | 2021 |
| HC Mobility Ltd | Transport & logistics | 2006 |
| HC Mobility Services Ltd | Transport & logistics | 2019 |
| HC Presenting Ltd | Information & communication | 2010 |
| HC Vehicles Ltd | Transport & logistics | 1994 |
| HDL UN Limited | Professional & scientific | 2019 |
| HE Property & Lettings Limited | Real estate | 2013 |
| Head Start Management Limited | Wholesale & retail | 2021 |
| Headroom Limited | Other services | 2017 |
| Headship Support Limited | Professional & scientific | 2009 |
| Health and Hygiene (Animal Health) Limited | Extraterritorial | 2012 |
| Health and Socialcare Technology Group Limited | Professional & scientific | 2013 |
| Healthcare Support Limited | Health & social care | 2020 |
| Healthways Services Ltd | Health & social care | 2024 |
| Hearing Sound Ltd | Wholesale & retail | 2023 |
| Heart Consult Ltd | Health & social care | 2023 |
| Hearthguard CIC | Wholesale & retail | 2026 |
| Heat Indian Restaurant Limited | Hospitality | 2014 |
| Heat Infra-Red Ltd | Extraterritorial | 2022 |
| Heathcote & Associates Ltd | Professional & scientific | 2019 |
| Heathe Meadow Management Company Limited | Real estate | 2016 |
| Heatherton Developments Limited | Construction | 2017 |
| Heatherton Developments Management Company Limited | Real estate | 2022 |
| Heathland Holidays Limited | Hospitality | 2022 |
| Heavenly Housekeeping Ltd | Administrative & support | 2025 |
| Hedging Supplies Ltd | Wholesale & retail | 2025 |
| Hedworth High Voltage Ltd | Professional & scientific | 2022 |
| Heekin Ltd | Hospitality | 2023 |
| Heelands Health Limited | Wholesale & retail | 2023 |
| Hefti Ltd | Manufacturing | 2026 |
| Heidi Kjeldsen Limited | Wholesale & retail | 2012 |
| Heisenberg Ltd | Wholesale & retail | 2025 |
| Helen Thacker Consulting Limited | Professional & scientific | 2026 |
| Heli Wolves Ltd | Extraterritorial | 2015 |
| Hella IT Limited | Information & communication | 2024 |
| Hella Secure Limited | Information & communication | 2024 |
| Hellenic Cellar Limited | Wholesale & retail | 2025 |
| Hellfire Studios Ltd | Information & communication | 2014 |
| Hello Sales Ltd | Administrative & support | 2017 |
| Help YOU Advertisement Limited | Other services | 2025 |