| Hardy Letting Limited | Real estate | 2022 |
| Hare House Investments Limited | Financial services | 2021 |
| Harhed Consultants Limited | Other services | 2019 |
| Haringate Group Ltd | Construction | 2025 |
| Harley Beauty WAX UK Ltd | Other services | 2012 |
| Harley Street Health Checks UK Limited | Health & social care | 2009 |
| Harmer Properties Limited | Real estate | 1940 |
| Harmick Homes Limited | Construction | 2025 |
| Harmony Land Limited | Real estate | 2012 |
| Harnham Court Management Company Limited | Real estate | 2003 |
| Harper Home Design Limited | Professional & scientific | 2024 |
| Harpic Ltd | Professional & scientific | 2019 |
| Harringay Holdings Limited | Financial services | 2023 |
| Harringay Real Estate Limited | Real estate | 2025 |
| Harris Fowler Asset Management Ltd | Hospitality | 2023 |
| Harris Fowler Broadoak Ltd | Real estate | 2024 |
| Harris Fowler Limited | Professional & scientific | 2009 |
| Harris Fowler Marketing Limited | Professional & scientific | 2017 |
| Harris Tree Care Limited | Agriculture & fishing | 2017 |
| Harrison & Co Design Ltd | Information & communication | 2013 |
| Harrisons Surveyors Limited | Professional & scientific | 2002 |
| Harry Tincknell Racing Limited | Administrative & support | 2008 |
| Harryy Limited | Wholesale & retail | 2026 |
| Harry’S Haulage SW Limited | Transport & logistics | 2024 |
| Hartley Securities Limited | Financial services | 1969 |
| Hartnell & Co Accountancy Ltd | Professional & scientific | 2012 |
| Hartree Farm Limited | Financial services | 2025 |
| Hartrow Farm Management Company Limited | Households | 2023 |
| Harvard Works of Art | Arts & recreation | 1959 |
| Harvey SW Ltd | Administrative & support | 2026 |
| Harvey's Window Cleaning Ltd | Administrative & support | 2021 |
| Haseley Court Management (Taunton) Limited | Households | 1976 |
| Haslocks Limited | Professional & scientific | 1994 |
| Hass Living Ltd | Real estate | 2017 |
| Hass Ventures Ltd | Real estate | 2022 |
| Hatch Beauchamp Garage Ltd | Transport & logistics | 2017 |
| Hatch Green Coaches Limited | Transport & logistics | 2007 |
| Hatch Green Garage Limited | Transport & logistics | 2003 |
| Hatch Mews Limited | Real estate | 2000 |
| Hatch Partnerships Ltd | Real estate | 2020 |
| Hatcher's Court (Management) Company Limited | Households | 1998 |
| Hatfield White Limited | Real estate | 2001 |
| Hatmatrix Limited | Professional & scientific | 2015 |
| Hats by Janine Ltd | Wholesale & retail | 2017 |
| Haus Hub Ltd | Real estate | 2025 |
| Have a Rice Day T/A the Meryan House Hotel Ltd | Hospitality | 2025 |
| Haven and Spark Ltd | Financial services | 2022 |
| Haven Land Ltd | Real estate | 2022 |
| Havens Cars Taunton Ltd | Wholesale & retail | 2026 |
| Havit Solutions, Limited | Professional & scientific | 2022 |
| Hawkers Properties Ltd | Real estate | 2024 |
| Hawkins Agri Limited | Wholesale & retail | 2003 |
| Hawkins Construction Limited | Extraterritorial | 2014 |
| Hawkins Securities Limited | Construction | 2012 |
| Hawkmore Limited | Hospitality | 2013 |
| Hawksgate Ltd | Construction | 2025 |
| Hawkwood & Co Ltd | Administrative & support | 2010 |
| Hawthorn Veterinary Practice Limited | Professional & scientific | 2005 |
| Hawthorne Property Group Ltd | Households | 2025 |
| Haydon House Poultry Limited | Agriculture & fishing | 2020 |
| Haydown Farm Developments Limited | Real estate | 2022 |
| Haydown Farm Developments NO 1 Limited | Construction | 2022 |
| Haydown Farm Developments NO 2 Limited | Construction | 2022 |
| Hayes Veterinary Limited | Financial services | 2021 |
| Hayeswood Construction Limited | Construction | 2016 |
| Hayfree Ltd | Manufacturing | 2026 |
| Haygrove Building Design Ltd. | Professional & scientific | 2019 |
| Hayhurst Estates Ltd | Real estate | 2023 |
| Hayle Bay Holdings | Financial services | 2025 |
| Hayley's Williton CIC | Wholesale & retail | 2025 |
| Hayne Securities Limited | Real estate | 1997 |
| Hazelgate Holdings Limited | Financial services | 2017 |
| Hazelgate Ltd | Health & social care | 1996 |
| HBR Building & Renovations Limited | Construction | 2018 |
| HBS Design & Build Limited | Extraterritorial | 2019 |
| HC 1167 Limited | Health & social care | 2011 |
| HD Tuition Ltd | Education | 2019 |
| Hdgt Design Ltd | Manufacturing | 2024 |
| HDM Kitchens Ltd | Administrative & support | 2017 |
| HDP Associates Limited | Professional & scientific | 2004 |
| HDP Trade Limited | Manufacturing | 2018 |
| Headley Group Services Ltd | Health & social care | 2026 |
| Headway Somerset | Other services | 2003 |
| Health House Limited | Health & social care | 2015 |
| Health Insurance Services (SW) Limited | Financial services | 2010 |
| Healthcare South West Ltd | Health & social care | 2003 |
| Healthy Bucks Ltd | Health & social care | 2023 |
| Heard's Property Group Ltd | Construction | 2024 |
| Heart Felt Home Ltd | Real estate | 2020 |
| Hearthstone Ltd | Real estate | 2021 |
| Hearts of Avalon Ltd | Health & social care | 2023 |
| Heat Radiation Limited | Construction | 1965 |
| Heath Retail Limited | Wholesale & retail | 2025 |
| Heatherton Park Limited | Real estate | 2025 |
| Heatherton Park Management Company Limited | Households | 1994 |
| Heathfield Construction Ltd | Construction | 2011 |
| Heathfield Cottages Ltd | Households | 2021 |
| Heathfield Industrial Building Limited | Real estate | 1963 |
| Heathfield Trading Limited | Agriculture & fishing | 2025 |
| Heathfield Windows Ltd | Extraterritorial | 2011 |