| Harvey Kelly Co Ltd | Real estate | 2023 |
| Harvey's Kitchen Fitters Ltd | Construction | 2013 |
| Harveygarden Consultants Limited | Extraterritorial | 2013 |
| HAS Trust | Administrative & support | 2017 |
| Haus Design & Construction Ltd | Construction | 2023 |
| Haus Lifestyle Ltd | Wholesale & retail | 2023 |
| Haust Ltd | Real estate | 2019 |
| Haustin Ltd | Manufacturing | 2024 |
| Have Burgers Ltd | Hospitality | 2020 |
| Haven Holdings Group Limited | Financial services | 2023 |
| Haven Timber Holdings Ltd | Wholesale & retail | 2012 |
| Haviland Computing Limited | Information & communication | 1996 |
| Hawdon Productions Limited | Arts & recreation | 1969 |
| Hawke Ridge Business Park Limited | Construction | 2014 |
| Hawke Ridge Business Park Management Limited | Real estate | 2017 |
| Hawker Group Developments Limited | Construction | 2017 |
| Hawker Projects Limited | Professional & scientific | 2012 |
| Hawkers Limited | Manufacturing | 2013 |
| Hawkes Projects (JS) Ltd | Construction | 2020 |
| Hawkins & Bone Security Ltd | Administrative & support | 2026 |
| Hawthorn Media Services Ltd | Information & communication | 2017 |
| HAY Hill House (Management) Ltd. | Households | 2010 |
| Haybridge Recruitment Ltd | Administrative & support | 2025 |
| Haycombe Property Limited | Real estate | 2016 |
| Haydart Investments (Biggleswade) Limited | Real estate | 2020 |
| Haydart Investments (Bury ST Edmunds) Limited | Real estate | 2020 |
| Haydart Investments Limited | Real estate | 2020 |
| Hayes Mount Management Limited | Households | 1988 |
| Hayesland House Management Limited | Households | 1971 |
| Haymarket Consulting Limited | Professional & scientific | 2019 |
| Haymarket Developments Limited | Real estate | 2019 |
| Haywards Group Ltd | Hospitality | 2018 |
| Hazel Solar Ltd | Energy | 2022 |
| Hazel Strategic Advisory Limited | Professional & scientific | 2026 |
| Hazel Todhunter Ltd | Professional & scientific | 2020 |
| HB Schemes Limited | Extraterritorial | 2010 |
| HBP Advisers Limited | Financial services | 2022 |
| HBP Consulting Limited | Information & communication | 2003 |
| HBS (SW) Limited | Construction | 2021 |
| HC 1370 Limited | Financial services | 2026 |
| HD PUB Investments Limited | Financial services | 2020 |
| HD Treats Ltd | Wholesale & retail | 2021 |
| Headlamp Associates Limited | Professional & scientific | 2010 |
| Headmark Coaching Ltd | Other services | 2025 |
| Heads UP Bath Ltd | Other services | 2017 |
| Healthinnova Limited | Information & communication | 2015 |
| Heart 2 Heart Compassionate Care Ltd | Extraterritorial | 2019 |
| Heart of Bath Limited | Health & social care | 2018 |
| Heartell Ltd | Professional & scientific | 2025 |
| Heartwood Consulting Limited | Other services | 2023 |
| Heatcity Limited | Information & communication | 2014 |
| Heath Associates Limited | Professional & scientific | 1992 |
| Heath House Events Limited | Arts & recreation | 2014 |
| Heathpoint Limited | Real estate | 2012 |
| Heaton Homes Limited | Construction | 1993 |
| Heaton Land Limited | Other services | 1994 |
| Hebron & Medlock Properties Limited | Real estate | 1939 |
| Hector Simpson Limited | Information & communication | 2019 |
| Hedgebrunch Limited | Other services | 2013 |
| Hedgerow Alchemy Ltd | Wholesale & retail | 2026 |
| Heimar Limited | Information & communication | 2026 |
| Helen Staff Consulting Limited | Professional & scientific | 2024 |
| Helena Roberts PR Limited | Professional & scientific | 2017 |
| Heliopause Ltd | Information & communication | 2024 |
| Hello Food Ltd | Hospitality | 2018 |
| Hello Studio Limited | Professional & scientific | 2005 |
| Hellobeautique Ltd | Other services | 2022 |
| Helps Plumbing & Heating Ltd | Construction | 2018 |
| Helvetica Properties Ltd | Real estate | 2025 |
| Henchmen Productions Limited | Information & communication | 2008 |
| Henderson Water and Environmental Limited | Professional & scientific | 2021 |
| Hendry IT Consulting Limited | Information & communication | 2014 |
| Henley & Co Ltd | Construction | 2023 |
| Henlia Properties Ltd | Real estate | 2024 |
| Henllys Farm Limited | Construction | 2021 |
| Hennabecca Ltd | Extraterritorial | 2003 |
| Henri Rose Trading Ltd | Financial services | 2022 |
| Henri Studio (Europe) Limited | Real estate | 1983 |
| Henrietta Gardens Properties Ltd | Real estate | 2023 |
| Henrietta Property Ltd | Construction | 2011 |
| Henrietta Road Flats Limited | Households | 1976 |
| Henrietta Villas Limited | Households | 2001 |
| Henry Brown Consulting Ltd | Professional & scientific | 2023 |
| Henry Malpas & SON Limited | Professional & scientific | 1993 |
| Henry White Media Limited | Information & communication | 2023 |
| Hepburn Estates Ltd | Real estate | 2024 |
| Herd Marketing Limited | Professional & scientific | 2011 |
| Hereward Feldwick Limited | Professional & scientific | 2025 |
| Heritage & Co UK Limited | Professional & scientific | 2024 |
| Heritage Events Limited | Administrative & support | 2013 |
| Heritage Group Travel Limited | Administrative & support | 1986 |
| Heritage Investment Properties Ltd | Real estate | 1998 |
| Heritage Motor Spares Ltd | Wholesale & retail | 2024 |
| Hermit House Ltd | Information & communication | 2024 |
| Hernebay Villa Residents Limited | Households | 1984 |
| Heron Canal Land Company Limited | Real estate | 2018 |
| Heronbridge Investment Management LLP | | 2005 |
| Heronbridge Limited | Financial services | 2005 |
| Heronsholm Ltd | Professional & scientific | 2008 |
| Hestia Homecare Services Ltd | Health & social care | 2024 |