| Hayes Hoyle Ltd | Real estate | 2020 |
| Hayes LEE Limited | Professional & scientific | 2020 |
| Hayes Parsons Holdings Ltd | Financial services | 1963 |
| Hayes Parsons Limited | Financial services | 1964 |
| Hayesmaker Media Ltd | Information & communication | 2012 |
| Hayford Recruitment Ltd | Administrative & support | 2025 |
| Hayker Windows Ltd | Construction | 2023 |
| Hayles & Howe Limited | Construction | 1995 |
| Hayley Watchorn Limited | Professional & scientific | 2007 |
| Hayleys Little Butterflys Ltd | Health & social care | 2018 |
| Haylo Aesthetics Ltd | Other services | 2025 |
| Haym Collective Ltd | Real estate | 2026 |
| Hayman Property Limited | Real estate | 2007 |
| Haynes Construction Limited | Construction | 2006 |
| Hays International Ltd | Wholesale & retail | 2022 |
| Haysenergy Limited | Construction | 2008 |
| Haystacc Limited | Information & communication | 2025 |
| Hayter Court Westbury-On-Trym Management Limited | Households | 1975 |
| Hayward & BOS Limited | Information & communication | 2014 |
| Hayward & Wooster (Realisations) Limited | | 1929 |
| Hayward Management Ltd | Administrative & support | 1980 |
| Hayward Solutions Ltd | Information & communication | 2024 |
| Haywards Airport Travel Services Limited | Transport & logistics | 1999 |
| Hazel Group Ltd | Real estate | 2019 |
| Hazel Holly Ltd | Wholesale & retail | 2026 |
| Hazel Land Owners Limited | Other services | 1957 |
| Hazelcare Limited | Health & social care | 2018 |
| Hazelmead Community Energy Limited | Energy | 2019 |
| Hazelnut Investment Ltd | Real estate | 2023 |
| Hazelton Advisory Ltd | Professional & scientific | 2013 |
| Hazelton Property Maintenance Limited | Construction | 2026 |
| Hazelwood Contracting Limited | Construction | 2021 |
| Hazelwood Gardens Care Limited | Health & social care | 2015 |
| Hazelwood Management Limited | Households | 1964 |
| Hazey Solutions Limited | Wholesale & retail | 2023 |
| Hazha Barber Limited | Other services | 2023 |
| Hazrok Ltd | Water & waste | 2025 |
| Hazy Hornet Ltd | Wholesale & retail | 2025 |
| HB Engineering Ltd | Professional & scientific | 2008 |
| HB Products & Print Ltd | Manufacturing | 2015 |
| HB Tile & Stone Solutions Ltd | Construction | 2025 |
| HB Ukproperty Ltd | Real estate | 2026 |
| Hb&A Services Limited | Financial services | 2014 |
| HBA Services Ltd | Transport & logistics | 2020 |
| HBC Property Management Ltd | Households | 2023 |
| HBE Property Ltd | Real estate | 2019 |
| HBK Building Contractors Ltd | Construction | 2009 |
| HBM Developments Ltd | Construction | 2023 |
| HBM Estates Ltd | Real estate | 2025 |
| Hbxl Group Limited | Information & communication | 2015 |
| Hbxl Professional Services Limited | Professional & scientific | 2013 |
| HBZ Properties Limited | Real estate | 2019 |
| HC Homes Ltd | Health & social care | 2017 |
| HC Investment Management Ltd | Professional & scientific | 2024 |
| HC Project Solutions Ltd | Professional & scientific | 2024 |
| HCG Limited | Transport & logistics | 2022 |
| Hcnc Limited | Information & communication | 2004 |
| Hcommerce Ltd | Wholesale & retail | 2025 |
| HCP Health & Fitness Ltd | Health & social care | 2021 |
| HD Dance Company CIC | Education | 2025 |
| HD Executive Travel Ltd | Transport & logistics | 2018 |
| HD Gurney Consulting Ltd | Extraterritorial | 2013 |
| HD Interactive Solutions Limited | Professional & scientific | 2006 |
| HD Landmark Ltd | Real estate | 2023 |
| HD Learning Ltd | Education | 2021 |
| HD Plastering Ltd | Construction | 2017 |
| HD Products Ltd | Wholesale & retail | 2022 |
| Hdbi Beauty Service Ltd | Other services | 2024 |
| HDG Group Limited | Professional & scientific | 2008 |
| HDI Tuning Limited | Information & communication | 2012 |
| Hdpt Fitness Ltd | Health & social care | 2024 |
| Hdsdev Ltd | Information & communication | 2011 |
| Head Heart and 2 Fingers Productions Limited | Information & communication | 2003 |
| Head on Customs Ltd | Wholesale & retail | 2023 |
| Head Property Limited | Real estate | 2024 |
| Head Spa Sabi Ltd | Other services | 2026 |
| HEAD4TALENT Ltd | Administrative & support | 2012 |
| Headchef 72 Ltd | Hospitality | 2026 |
| Headford Capital Limited | Professional & scientific | 2025 |
| Headhunterz Resourcing Ltd | Administrative & support | 2019 |
| Headington Roofing Services Limited | Construction | 2002 |
| Headley Lane Limited | Real estate | 2010 |
| Headley Park Management Company Limited | Households | 2007 |
| Headley Park Range Limited | Wholesale & retail | 2025 |
| Headley Park Storage Ltd | Professional & scientific | 2025 |
| Headroom Studios Ltd | Information & communication | 2018 |
| Heads Apart Ltd | Construction | 2013 |
| Heads UP Partners Limited | Professional & scientific | 2025 |
| Headspace Hair & Beauty Limited | Other services | 2012 |
| Headway Property Solutions Ltd | Construction | 2022 |
| Headway Storage Systems Ltd. | Construction | 1991 |
| Headwind Music Ltd | Wholesale & retail | 2016 |
| Heal & SON (Bristol) Limited | Construction | 2003 |
| Heal Property Services Limited | Real estate | 2008 |
| Heal UK Property Services Limited | Real estate | 2021 |
| Healing Hands for Health Limited | Health & social care | 2004 |
| Healing Weeds CIC | Education | 2025 |
| Health Academy Limited | Education | 2020 |
| Health and Energy Ltd | Professional & scientific | 2021 |
| Health and Medical Education and Research Centre Limited | Information & communication | 2018 |