| GX Motors Ltd | Wholesale & retail | 2025 |
| H & a Management Limited | Information & communication | 2006 |
| H & S Autos Ltd | Wholesale & retail | 2018 |
| H G Field & Co Limited | Professional & scientific | 2003 |
| H&H High Properties Ltd | Real estate | 2025 |
| H4U Construction Limited | Real estate | 2019 |
| Haasp Limited | Construction | 2003 |
| Hallows Field Limited | Real estate | 2010 |
| Halo Architects Limited | Professional & scientific | 2019 |
| Hampshire Sports Inc. Ltd. | Professional & scientific | 2011 |
| Hansa Monani Ltd | Extraterritorial | 2026 |
| Hanwha Vision Europe Limited | Wholesale & retail | 2001 |
| Happy Groundworks Ltd | Construction | 2021 |
| Harcourts House Ltd | Manufacturing | 2023 |
| Harley Medaesthetics Ltd | Health & social care | 2020 |
| Harps Building Construction Ltd | Construction | 2026 |
| Harriet Basham Agencies Limited | Wholesale & retail | 2018 |
| Harris & Sons Garden Services Ltd | Administrative & support | 2026 |
| Harrislias Comms Limited | Administrative & support | 2017 |
| Harrys Fish Bar Blackwater Limited | Hospitality | 2026 |
| Harrys Fish Bar Ltd | Hospitality | 2019 |
| Harvest Merchants Limited | Wholesale & retail | 2025 |
| Harwood Recruitment Solutions Limited | Administrative & support | 2023 |
| Hashtag Media Marketing Limited | Professional & scientific | 2017 |
| Hasmeed Ltd | Information & communication | 2026 |
| Hayley Jayne Limited | Professional & scientific | 2014 |
| Hayre Corp Limited | Construction | 2020 |
| Hayward Hounds Limited | Administrative & support | 2021 |
| HB SET Design Limited | Information & communication | 2025 |
| HCL Car Sales Ltd | Wholesale & retail | 2023 |
| HCL Chauffeurs UK Limited | Transport & logistics | 2005 |
| Healing Minds London Ltd | Health & social care | 2016 |
| Health and Beauty Association | Other services | 1988 |
| Health NOW Limited | Information & communication | 2021 |
| Healthcare Conferences UK Ltd | Health & social care | 2011 |
| Heath Strategies Limited | Professional & scientific | 2025 |
| Henderson Bray Ltd | Professional & scientific | 2017 |
| Henderson European Ltd | Wholesale & retail | 2011 |
| Henderson One Ltd | Real estate | 2019 |
| Hendersons General Services Limited | Other services | 1965 |
| Henley Fabrication Ltd | Manufacturing | 2023 |
| Henley Sales & Charter Limited | Transport & logistics | 2002 |
| Heor & Access Consulting Ltd | Professional & scientific | 2023 |
| Herbafit Ltd | Arts & recreation | 2021 |
| Hermlux Ltd | Wholesale & retail | 2025 |
| Herschel Installation Services Ltd | Construction | 2023 |
| HG Maple Limited | Real estate | 2024 |
| HG North Investments Limited | Real estate | 2020 |
| Hidden Path Limited | Health & social care | 2021 |
| High Calibre Roofing Limited | Construction | 2024 |
| High View Construction Ltd | Construction | 2020 |
| High-Up Construction Limited | Construction | 2017 |
| Hillside Imports Limited | Households | 2017 |
| Hippo Trading Limited | Wholesale & retail | 1995 |
| HIS Presence Church | Other services | 2018 |
| Historic Coinage Limited | Wholesale & retail | 2011 |
| HL Air Conditioning Services Limited | Energy | 2021 |
| HNV Creations Ltd | Arts & recreation | 2020 |
| Hodders (Ottershaw) Limited | Real estate | 2012 |
| Hodders Lettings Limited | Real estate | 2012 |
| Hollydale Cyber Ltd | Information & communication | 2022 |
| Home From Home Dog Boarding Agency Limited | Other services | 1999 |
| Home-Start Runnymede and Woking | Health & social care | 2005 |
| Homeland Mobile Homes Ltd | Real estate | 2026 |
| Homer Roofing Limited | Construction | 2006 |
| Hope Global Compassion Ltd | Other services | 2020 |
| Horesca Ltd | Manufacturing | 2010 |
| Horsell Court (Chertsey) Limited | Households | 1963 |
| Hospitality Holdings Limited | Professional & scientific | 2000 |
| House of Nuptials Limited | Administrative & support | 2025 |
| Howard Commercials Limited | Wholesale & retail | 2002 |
| HR Advanced Ltd | Construction | 2021 |
| HS Education Management Limited | Administrative & support | 2019 |
| HSL Building Services (Southern) Ltd | Construction | 2018 |
| Hssc Property (Notts) Limited | Real estate | 2025 |
| Hssc Property (Surrey) Limited | Real estate | 2025 |
| Hubbub Catering Limited | Hospitality | 2020 |
| Hunt's Investments Ltd | Real estate | 2008 |
| Hunter Homes Limited | Administrative & support | 2000 |
| Hussain Building Services Surrey Ltd | Construction | 2024 |
| Hydrologic Systems Limited | Construction | 1999 |
| Hydrowebshop Limited | Administrative & support | 2004 |
| Hythe Court Freehold Company Limited | Real estate | 2014 |
| I D Exports Limited | Other services | 2015 |
| Iaegames Ltd | Manufacturing | 2026 |
| IAG Consultants Ltd | Professional & scientific | 2022 |
| Iain Lowe Ltd | Construction | 2026 |
| IAN Batey Ltd | Other services | 2018 |
| Ice Medical Limited | Health & social care | 2012 |
| Icon@Services Limited | Wholesale & retail | 2025 |
| Ideals Construction Limited | Construction | 2019 |
| IIE Tech Limited | Manufacturing | 2017 |
| Ikon Bishops House Ltd | Real estate | 2018 |
| Ikon Construction Services Limited | Professional & scientific | 2020 |
| Ikon Dover Limited | Real estate | 2018 |
| Ikon Ltd | Construction | 2021 |
| Ikon Norfolk Ltd | Real estate | 2018 |
| Ikon Property Services Limited | Real estate | 2020 |
| Ikon Real Estate Group Ltd | Real estate | 2017 |
| Ikon UK Holding Limited | Real estate | 2018 |