| Halix Ventures Ltd | Health & social care | 2025 |
| Hall Vantage Limited | Water & waste | 1984 |
| Hallmark Resource Solutions Ltd | Health & social care | 2024 |
| Halo Maids Limited | Wholesale & retail | 2020 |
| Hama Barbers Ltd | Other services | 2022 |
| Hamilton Bennett Financial Solutions Ltd | Other services | 2021 |
| Hamilton Reiss Ltd | Professional & scientific | 2023 |
| Hammer Fire & Compliance Ltd | Public administration | 2025 |
| Hampers Direct Ltd | Wholesale & retail | 2020 |
| Hanes Consults Limited | Financial services | 2016 |
| Haniel&Blessing Ltd | Real estate | 2024 |
| Hannafords Contracting Limited | Transport & logistics | 2015 |
| Hannafords Media Limited | Wholesale & retail | 2026 |
| Hanover Technologies Limited | Information & communication | 2020 |
| Hanslar Property Ltd | Real estate | 2005 |
| Hany Barbers Limited | Other services | 2023 |
| Hapori Ltd | Other services | 2016 |
| Happy Dragon Limited | Hospitality | 2017 |
| Happy Go Fares Fair Limited | Transport & logistics | 2024 |
| Happy Roti Ltd | Hospitality | 2022 |
| Happy Scientifics Limited | Professional & scientific | 2019 |
| Happydays Property Limited | Real estate | 2025 |
| Happyfish Books Ltd | Wholesale & retail | 2007 |
| Happys Beauty Hub Limited | Other services | 2026 |
| HAR Delivery Limited | Transport & logistics | 2026 |
| HAR Sewa Medical Trust Limited | Health & social care | 2014 |
| Hara UK Trans Ltd | Transport & logistics | 2016 |
| Harcourt Builders 1972 Limited | Construction | 2026 |
| Hardhillon Contruction Limited | Construction | 2025 |
| Harding E4 Contractors Ltd | Construction | 2023 |
| Hardip Properties Ltd | Real estate | 2025 |
| Harjas Freight Ltd | Transport & logistics | 2024 |
| Harley Whales Limited | Information & communication | 2016 |
| Harman Groceries and Street Food Ltd | Wholesale & retail | 2024 |
| Harmer Freehold Ltd | Real estate | 2015 |
| Harmony Luthier Ltd | Manufacturing | 2026 |
| Harmony Mindset Solutions Limited | Health & social care | 2024 |
| Harrier Vision Security Ltd | Construction | 2022 |
| Harringden Limited | Construction | 2026 |
| Harris & Bros Logistics Ltd | Transport & logistics | 2020 |
| Harris Building Facilities Management Ltd | Other services | 2017 |
| Harris Ellis Consultancy Ltd | Administrative & support | 2025 |
| Harris Property Management Ltd | Real estate | 2023 |
| Harry Concrete Suppliers Ltd | Construction | 2025 |
| Harry Properties Ltd | Real estate | 2021 |
| Harry Shotta Entertainments Ltd | Information & communication | 2016 |
| Harrypharma Limited | Wholesale & retail | 2020 |
| Hartmech Ltd | Construction | 2022 |
| Hartnup Electrical Ltd | Construction | 2025 |
| Hartools Limited | Wholesale & retail | 2025 |
| Hartwell Health & Business Solutions Ltd | Professional & scientific | 2023 |
| Harvak Ltd | Construction | 2015 |
| Harvey Kent Homes Ltd | Real estate | 2024 |
| Harvey Kent Ltd | Construction | 2023 |
| Hassell Inclusion Holdings Limited | Information & communication | 2022 |
| Hassell Inclusion Limited | Information & communication | 2011 |
| Hastingden Limited | Construction | 2014 |
| Hatch Spaces Ltd | Hospitality | 2022 |
| Hatl Limited | Information & communication | 2016 |
| Hatten Wyatt LLP | | 2011 |
| Hatten Wyatt Notaries LLP | | 2011 |
| Hatten Wyatt Solicitors & Advocates LLP | | 2011 |
| Hatten Wyatt Wealth Management LLP | | 2011 |
| Hatter KM Limited | Hospitality | 2022 |
| Haven Care Support Services Limited | Health & social care | 2013 |
| Haven Resource Services Ltd | Health & social care | 2016 |
| Havenhill Limited | Professional & scientific | 1998 |
| Hawkey’S Sports Performance Coaching Limited | Education | 2022 |
| Hayat International Limited | Wholesale & retail | 2017 |
| Hayati Luxe Furniture Ltd | Wholesale & retail | 2025 |
| Haych Construction Limited | Construction | 2019 |
| Hayer Group Holdings Ltd | Real estate | 2022 |
| Hayer Investments Kent Ltd | Real estate | 2018 |
| Hayer Investments South Ltd | Real estate | 2019 |
| Hayer Property Development Group Ltd | Real estate | 2021 |
| Hayer Property Group Management Ltd | Real estate | 2021 |
| Hayloh Homes Limited | Real estate | 2024 |
| Haynan Funeral Services Limited | Other services | 2020 |
| Haynan Services Limited | Health & social care | 2019 |
| Hayre & Associates Ltd | Professional & scientific | 2021 |
| Haz-Group Limited | Construction | 2012 |
| Hazardous Area Design & Inspection Associates Limited | Other services | 2014 |
| HB Barber Limited | Other services | 2024 |
| HB Construct Ltd | Construction | 2024 |
| HB Resourcing Ltd | Administrative & support | 2023 |
| HBB Civils Ltd | Other services | 2021 |
| HC Building & Construction Services Ltd | Construction | 2022 |
| HCA Two Three Consulting Ltd | Professional & scientific | 2022 |
| HD Electrical Ltd | Construction | 2015 |
| Hdgreen Limited | Transport & logistics | 2024 |
| HDI House Group Limited | Health & social care | 2025 |
| HDL Plant Hire Ltd | Construction | 2024 |
| Headland Technical Services Limited | Professional & scientific | 2009 |
| Healing Forever Limited | Health & social care | 2022 |
| Healthifyreset Ltd | Education | 2026 |
| Heart Zone Management Ltd | Arts & recreation | 2001 |
| Heartan Limited | Health & social care | 2018 |
| Heartistry Ltd | Health & social care | 2026 |
| Hearts of Wonder (HOW) Nurseries Ltd | Education | 2024 |
| Hearts Together Event Planning and Management Ltd | Hospitality | 2019 |