| Hayre Corporation Limited | Extraterritorial | 2025 |
| Haytch Media Ltd | Professional & scientific | 2025 |
| Haytches Limited | Hospitality | 2024 |
| Hazir HAI Ltd | Wholesale & retail | 2023 |
| Hazmat Logistics Ltd | Transport & logistics | 2005 |
| Hazzel Limited | Other services | 2017 |
| HB Medica Ltd | Health & social care | 2024 |
| HBJ Style Ltd | Other services | 2024 |
| HBS Technologies Limited | Information & communication | 2009 |
| HBV Solutions Limited | Information & communication | 2017 |
| HC Technologies Ltd | Information & communication | 2018 |
| Hcati Solutions Limited | Information & communication | 2012 |
| HD Consultancy Services Limited | Information & communication | 2022 |
| HD Joy Champions Ltd | Wholesale & retail | 2022 |
| HD Property Trading Ltd | Real estate | 2023 |
| Head 2 TOE Body Ltd | Manufacturing | 2021 |
| Heal Aroma UK Ltd | Wholesale & retail | 2025 |
| Heal-All Ltd | Wholesale & retail | 2022 |
| Healthcare Global Enterprises Ltd | Health & social care | 2025 |
| Healthlink Investments Limited | Real estate | 1996 |
| Healthwise Chiropractic Clinic Ltd | Health & social care | 2015 |
| Healthy Bite Chiswick Ltd | Hospitality | 2021 |
| Hean UK Limited | Transport & logistics | 2023 |
| Heart Investments Limited | Real estate | 2020 |
| Heart of Things Studio Limited | Construction | 2021 |
| Heat Volt Maintenance Ltd | Construction | 2021 |
| Heath Court Residents' Association (Hounslow) Limited | Households | 1982 |
| Heath Local Ltd | Wholesale & retail | 2025 |
| Heathdale Properties Limited | Real estate | 2025 |
| Heathrow (SP) Limited | Professional & scientific | 2007 |
| Heathrow Airport Fuel Company Limited | Other services | 1996 |
| Heathrow Airport Holdings Limited | Professional & scientific | 2006 |
| Heathrow Airport Limited | Transport & logistics | 1986 |
| Heathrow Car Parts & Tyres Ltd | Wholesale & retail | 2025 |
| Heathrow Cargo Limited | Transport & logistics | 2024 |
| Heathrow Community Initiative | Education | 2013 |
| Heathrow Contractors Ltd | Real estate | 2011 |
| Heathrow Developments Limited | Real estate | 2015 |
| Heathrow Enterprises Limited | Professional & scientific | 1992 |
| Heathrow Executive Cars Limited | Transport & logistics | 2024 |
| Heathrow Express Operating Company Limited | Transport & logistics | 1996 |
| Heathrow Finance PLC | Professional & scientific | 2007 |
| Heathrow Global Logistics Limited | Transport & logistics | 2023 |
| Heathrow Hydrant Operating Company Limited | Other services | 1993 |
| Heathrow Lands Limited | Real estate | 2020 |
| Heathrow Lettings Ltd | Real estate | 2002 |
| Heathrow Link Limited | Hospitality | 2019 |
| Heathrow Logistics PVT Ltd | Transport & logistics | 2026 |
| Heathrow Luxe Limited | Administrative & support | 2024 |
| Heathrow Malayalee Association Ltd | Health & social care | 2014 |
| Heathrow Opco Ltd | Hospitality | 2013 |
| Heathrow Pickups Ltd | Transport & logistics | 2025 |
| Heathrow Roofing & Guttering Ltd | Construction | 2025 |
| Heathrow School of Gymnastics & Dance Ltd | Arts & recreation | 2005 |
| Heathrow T2 Hotel Limited | Hospitality | 2015 |
| Heathrow T4 GP Limited | Financial services | 2015 |
| Heathrow T4 Hotel Limited | Hospitality | 2015 |
| Heathrow T5 Hotel Limited | Professional & scientific | 1999 |
| Heathrow Trade Cars Limited | Wholesale & retail | 2015 |
| Heathrow Travel-Care | Health & social care | 1986 |
| Heathrow Travellers Hub Limited | Hospitality | 2022 |
| Heathrow West Limited | Administrative & support | 2019 |
| Heathrow Wheels Ltd | Wholesale & retail | 2016 |
| Heathrowlimoz Ltd | Transport & logistics | 2018 |
| Heathside (Hounslow) Management Company Limited | Households | 2004 |
| Heena's Events Limited | Hospitality | 2015 |
| Heideveld Logistics Ltd | Transport & logistics | 2026 |
| Heldmann UK Ltd | Wholesale & retail | 2026 |
| Helio Online Ltd | Wholesale & retail | 2020 |
| Hello Beauty Studio Ltd | Other services | 2021 |
| Hellowsoft International UK Limited | Information & communication | 2025 |
| Help With Living Ltd | Professional & scientific | 2022 |
| Helping Hours International Ltd | Health & social care | 2024 |
| Hema Consultants Ltd | Real estate | 2014 |
| Hema Holdings Ltd | Real estate | 2024 |
| Hema Trading Ltd | Wholesale & retail | 2011 |
| Hemaz Ltd | Real estate | 2020 |
| Hengheng Kitchen Limited | Hospitality | 2025 |
| Henley Retail Investments Ltd | Real estate | 2025 |
| Henleys Heating Supplies Ltd | Wholesale & retail | 2011 |
| Henna & Giya Homes Limited | Real estate | 2022 |
| Hennabyaleena Ltd | Other services | 2026 |
| Henry - the Art of Living Ltd | Hospitality | 2006 |
| Henry MAX Transport Ltd | Transport & logistics | 2021 |
| HER Himmat Ltd | Wholesale & retail | 2021 |
| Hera Collection Limited | Wholesale & retail | 2003 |
| Herbie Motors Ltd | Wholesale & retail | 2025 |
| Hereti Ltd | Information & communication | 2009 |
| Heritage Heights Ltd | Construction | 2025 |
| Heritage Home Care and Roofing Ltd | Construction | 2025 |
| Heritage Investments Group Limited | Financial services | 2021 |
| Heritage Property Lettings Ltd | Real estate | 2024 |
| Heritage School of Yoga Ltd | Education | 2019 |
| Heritage Structures Ltd | Professional & scientific | 2020 |
| Hernoor Ltd | Wholesale & retail | 2024 |
| Heston and Co Properties Ltd | Real estate | 2020 |
| Heston Auto Solutions Limited | Water & waste | 2017 |
| Heston Barbers Ltd | Other services | 2022 |
| Heston Booze & Wine Ltd | Wholesale & retail | 2025 |
| Heston Care Services Ltd | Health & social care | 2015 |