| Heathrow Groundworks Ltd | Construction | 2022 |
| Heathrow Stays Ltd | Real estate | 2025 |
| Heathrow Truck Park Ltd | Transport & logistics | 2022 |
| Heathrow Waste Management Ltd | Water & waste | 2019 |
| Heavy Hanger Limited | Wholesale & retail | 2024 |
| Henley Morgan Limited | Administrative & support | 2015 |
| Herd Hire Slough Limited | Transport & logistics | 2018 |
| Hesa Holdings Ltd | Financial services | 2024 |
| Hesa Properties Ltd | Real estate | 2024 |
| Heston Truck Wash Ltd | Administrative & support | 2024 |
| Hexagon Support Services Limited | Administrative & support | 2020 |
| HFH Automotive Ltd | Wholesale & retail | 2024 |
| HFI Group Limited | Transport & logistics | 2019 |
| HGD Innovations Ltd | Manufacturing | 2016 |
| HHS Medical Services Ltd | Health & social care | 2016 |
| Hiedelberg Ltd | Administrative & support | 2025 |
| High END Automotives Ltd | Wholesale & retail | 2023 |
| High Line Yachting Limited | Arts & recreation | 1971 |
| Highlights Hub Limited | Information & communication | 2025 |
| Histopathology Expertise-International Limited | Administrative & support | 2014 |
| Historics Classic and Sportscar Auctions Ltd | Administrative & support | 2009 |
| Hixon Dart Estates Ltd | Real estate | 2022 |
| Holmsdale Close Residents Association Limited | Professional & scientific | 1989 |
| Home Counties Roof Care Ltd | Wholesale & retail | 2024 |
| Homely Candles Limited | Manufacturing | 2024 |
| Hope Rehab Delhi Ltd | Health & social care | 2024 |
| Horizon Crafters Ltd | Construction | 2020 |
| Hortlands Ltd | Administrative & support | 2014 |
| Hothi Capital Limited | Real estate | 2018 |
| House of One Ltd | Wholesale & retail | 2021 |
| HPK Property Ventures Ltd | Real estate | 2022 |
| Hqiq Ltd | Wholesale & retail | 2025 |
| HRD Property Investments Ltd | Real estate | 2025 |
| Htkd Colnbrook Ltd | Arts & recreation | 2021 |
| Huang Investments Limited | Real estate | 2024 |
| Hublix Ltd | Information & communication | 2025 |
| Hughenden Gardens Management Company Limited | Households | 2010 |
| Hughes Property Developments Ltd | Real estate | 2021 |
| Hulfam Investments UK Ltd | Construction | 2021 |
| Hyland Holdings Ltd | Real estate | 2020 |
| Ibnex Ltd | Wholesale & retail | 2025 |
| IFH Consultancy Limited | Professional & scientific | 2014 |
| Image Space Solutions Limited | Administrative & support | 2016 |
| Imigo Ltd | Professional & scientific | 2026 |
| Impact Motors Ltd | Wholesale & retail | 2022 |
| Inayat Homes Ltd | Real estate | 2026 |
| Independent Transport Manager Services Ltd. | Extraterritorial | 2025 |
| Inder Transport Limited | Transport & logistics | 2012 |
| Indie Novella Ltd | Information & communication | 2021 |
| Indigo Restoration Ltd | Other services | 2022 |
| Infinity House Limited | Real estate | 2013 |
| Inforax Ltd | Information & communication | 2023 |
| Inner Balance Acupuncture and Consulting Limited | Professional & scientific | 2026 |
| Innovaderma Limited | Wholesale & retail | 2014 |
| Innovaderma UK Limited | Extraterritorial | 2014 |
| Innovation Malta Ltd | Wholesale & retail | 2021 |
| International KHO KHO Federation | Education | 2018 |
| Inventive Enterprises Ltd | Professional & scientific | 2024 |
| IP Consultancy Services Limited | Information & communication | 2018 |
| Ipic Ltd | Real estate | 2016 |
| Ismart Property Solutions Limited | Real estate | 2014 |
| IT AGS Vision Ltd | Information & communication | 2018 |
| Itero Development Limited | Professional & scientific | 2010 |
| Itero Technologies Limited | Professional & scientific | 2020 |
| ITSOLUTIONS4LESS Ltd | Information & communication | 2014 |
| Iver Accountancy Ltd | Professional & scientific | 2011 |
| Iver Community Childcare C.I.C. | Health & social care | 2009 |
| Iver Construction Limited | Construction | 2011 |
| Iver Consulting Limited | Administrative & support | 2005 |
| Iver Express Ltd | Wholesale & retail | 2023 |
| Iver Fish & Chips Ltd | Hospitality | 2013 |
| Iver Grill BBQ Limited | Hospitality | 2025 |
| Iver Grill House Ltd | Hospitality | 2024 |
| Iver Homes Ltd | Construction | 2019 |
| Iver Local Limited | Wholesale & retail | 2021 |
| Iver Logistics Limited | Transport & logistics | 2021 |
| Iver POP Pizza Ltd | Hospitality | 2025 |
| Iver Properties Ltd | Real estate | 2021 |
| Iver Property Consultants Ltd | Professional & scientific | 2023 |
| Iver Van Sales Ltd | Wholesale & retail | 2019 |
| Iver Village Fish & Chips Ltd | Hospitality | 2024 |
| Iverbirch Limited | Public administration | 2018 |
| Iverdale Investments Ltd | Real estate | 2022 |
| IVS Immigration & Visa Services Ltd | Information & communication | 2010 |
| Iwonco Ltd | Real estate | 2016 |
| Ixeyni Ltd | Transport & logistics | 2026 |
| J & M Convenience Limited | Wholesale & retail | 2018 |
| J Bains Transport Ltd | Transport & logistics | 2013 |
| J Gray Property Services Ltd | Water & waste | 2026 |
| J J Mynett Ltd | Construction | 2016 |
| J Sibley Lighting Limited | Construction | 2015 |
| Jacob Claude Estates & Management Ltd | Real estate | 2026 |
| Jade Group International Ltd | Wholesale & retail | 2018 |
| James Daniel Construction London Limited | Construction | 2014 |
| Jasmine Developments South East Limited | Construction | 2016 |
| Jatt Enterprises Ltd | Wholesale & retail | 2026 |
| Jayvanni Ltd | Information & communication | 2022 |
| JB Shell Ltd | Administrative & support | 2019 |
| JCA Plumbing and Heating Limited | Construction | 2025 |
| JD Support Services Ltd | Information & communication | 2005 |