| Have Your Cake and EAT IT Limited | Administrative & support | 2003 |
| Havisha Saanvi Homes Ltd | Real estate | 2022 |
| Hawk Freight Holdings Limited | Professional & scientific | 2009 |
| Hawk Freight Logistics Limited | Professional & scientific | 2006 |
| Hawk I Limited | Professional & scientific | 2006 |
| Hawkins Coffee Limited | Wholesale & retail | 1978 |
| Hawksby Ltd | Administrative & support | 2018 |
| Hayes FX Ltd | Construction | 2022 |
| Hayley Borg Ltd | Real estate | 2021 |
| HAZ Mission Critical Ltd | Construction | 2013 |
| Hazelcast UK Limited | Information & communication | 2015 |
| HB Dobbin Financial Planning Limited | Financial services | 1998 |
| HB Hotels Limited | Professional & scientific | 1985 |
| HBM Consultants LLP | | 2014 |
| HC Fuels Limited | Professional & scientific | 1998 |
| HD Complete Care Berkshire Ltd | Construction | 2025 |
| HD Property Cambridge Ltd | Real estate | 2023 |
| HD UK Mayfair Ltd | Real estate | 2023 |
| HD UK Property Ltd | Real estate | 2022 |
| HDK313 UK Ltd | Wholesale & retail | 2023 |
| Headington Properties Ltd | Households | 2023 |
| Headspace Consulting Limited | Professional & scientific | 2004 |
| Headzone Group Ltd | Information & communication | 2025 |
| Health Diplomats Limited | Administrative & support | 2021 |
| Health Journey Clinics Limited | Information & communication | 2024 |
| Healthcare Millenium Limited | Extraterritorial | 2013 |
| Healthcare Providers (Gloucester) Limited | Financial services | 2001 |
| HEALTHSTATION1 Ltd | Professional & scientific | 2020 |
| Healthy Ovens Ltd | Administrative & support | 2019 |
| Healthy Sprouts Nutrition Limited | Health & social care | 2025 |
| Hearne Place Residents Management Company Limited | Households | 2011 |
| Heart Beat Breaks Limited | Wholesale & retail | 2026 |
| Heart Management Ltd. | Real estate | 1990 |
| Heartful Coaching Ltd | Education | 2020 |
| Heartsure Limited | Health & social care | 2012 |
| Heatflow Installations Ltd. | Construction | 2014 |
| Heathcroft 2015 Limited Partnership | | 2015 |
| Heathrow Weekend Freight Services Limited | Transport & logistics | 2000 |
| Hedgeman Associates Limited | Professional & scientific | 2014 |
| Hedian Limited | Construction | 2006 |
| Hedian Records Management Limited | Professional & scientific | 2019 |
| Heffron Wright Tiling Limited | Construction | 2020 |
| Heidelberg Materials BP Limited | Financial services | 2014 |
| Heidelberg Materials Canada Holding Limited | Financial services | 2009 |
| Heidelberg Materials Cement Holding Limited | Financial services | 1987 |
| Heidelberg Materials Euro II Limited | Professional & scientific | 2014 |
| Heidelberg Materials Euro III Limited | Professional & scientific | 2015 |
| Heidelberg Materials Limited | Professional & scientific | 2014 |
| Heidelberg Materials UK Holding II Limited | Professional & scientific | 2007 |
| Heidelberg Materials UK Holding Limited | Financial services | 2007 |
| Heidelberg Materials UK Limited | Financial services | 2003 |
| Helideq International Limited | Professional & scientific | 2015 |
| Helideq Limited | Extraterritorial | 2015 |
| Helios & Partners Ltd | Professional & scientific | 2026 |
| Hello Straw (UK) Limited | Administrative & support | 2022 |
| Help in Hand Support Services Ltd | Health & social care | 2023 |
| Helpinghandsuk.Co.Uk Ltd | Households | 2006 |
| Hemmings Waste Management Limited | Financial services | 1960 |
| Hemyock Consultants Limited | Real estate | 2018 |
| Henley Car Hire Ltd | Administrative & support | 2018 |
| Henley Electrical Services Limited | Extraterritorial | 2006 |
| Henley Executive Cars Ltd | Transport & logistics | 2020 |
| Henley Security Limited | Extraterritorial | 2007 |
| Henley Theatre Services Limited | Administrative & support | 2025 |
| Hennbrook Limited | Administrative & support | 2019 |
| Hennerton Brook Limited | Financial services | 2024 |
| Herbert Developments Limited | Construction | 2012 |
| Herdup Limited | Professional & scientific | 2025 |
| Herewards House Ltd | Health & social care | 2014 |
| Heritage Energy Solutions Ltd | Construction | 2026 |
| Heritage Healthcare Berkshire Ltd | Health & social care | 2020 |
| Heritage Venues Limited | Hospitality | 2014 |
| Hester & Harber Limited | Construction | 2021 |
| Heston Blumenthal Development Limited | Extraterritorial | 2005 |
| Heston Blumenthal Studios Limited | Extraterritorial | 2005 |
| Hewland Engineering Limited | Manufacturing | 1957 |
| Heywood Family Investment Company Unlimited | Financial services | 2026 |
| Heywood Farm Barns Management Company Limited | Other services | 1998 |
| Heywood Stores Ltd | Wholesale & retail | 2022 |
| HG Enterprises (UK) Limited | Real estate | 2003 |
| HG Estates and Holdings Ltd | Real estate | 2026 |
| Hi-Standard Installs Ltd | Other services | 2021 |
| Hibah Ltd | Manufacturing | 2023 |
| High Five Productions Limited | Hospitality | 2019 |
| High Lodge Adventure Golf Ltd | Arts & recreation | 2022 |
| High Meadow Management Company (Maidenhead) Limited | Administrative & support | 1991 |
| High Quality Contractors Ltd | Construction | 2019 |
| High Trees Holyport Management Company Limited | Households | 2016 |
| High Value Systems Engineering Ltd | Construction | 2012 |
| Highgrove Park Estates Ltd | Real estate | 2026 |
| Highway Management (Scotland) Holding Limited | Financial services | 2008 |
| Highway Management (Scotland) Limited | Financial services | 2008 |
| Highway Management M80 Investment Limited | Financial services | 2010 |
| Highway Management M80 Topco Limited | Financial services | 2011 |
| Hilfield Engineering Services Limited | Manufacturing | 2006 |
| Hill Rentals Limited | Households | 2019 |
| Hill River Ltd | Real estate | 2025 |
| Hillcon Growth Ltd | Professional & scientific | 2025 |
| Hillcrest Fleet Management Limited | Wholesale & retail | 1997 |
| Hillrise Associates London Ltd | Real estate | 2019 |