| Hayder Hashim Ltd | Real estate | 2025 |
| Hayes Design Ltd | Professional & scientific | 2007 |
| Hayton Services Ltd | Construction | 2021 |
| Hayward Tyler UK Ltd | Professional & scientific | 2008 |
| Hayyat Ltd | Hospitality | 2017 |
| Hazara UK Trading Limited | Administrative & support | 2019 |
| Hazelfield Estates Ltd | Real estate | 2026 |
| HB Carpentry & Joinery Limited | Manufacturing | 2010 |
| HB Cloud Services Ltd | Information & communication | 2022 |
| HB Consultancy and Trading Ltd | Wholesale & retail | 2026 |
| HB Performance Group Ltd | Wholesale & retail | 2025 |
| Hbdog Ltd | Arts & recreation | 2019 |
| HBH Contractors Ltd | Other services | 2018 |
| HBI Global Ltd | Wholesale & retail | 2012 |
| HC Luton Management Limited | Households | 2025 |
| HC Okechukwu Global Ltd | Wholesale & retail | 2025 |
| HD Appliance Repairs Ltd | Other services | 2023 |
| HD Building Construction Ltd | Construction | 2017 |
| HD Ealing Ltd | Professional & scientific | 2026 |
| HD Grooming Limited | Other services | 2019 |
| HD Marylebone Ltd | Professional & scientific | 2025 |
| HD Store-Uk Ltd | Wholesale & retail | 2024 |
| HDR Consultancy Limited | Professional & scientific | 2015 |
| HDR Driving Services Limited | Transport & logistics | 2013 |
| HDS Developers Ltd. | Administrative & support | 2016 |
| HE Logistics Ltd | Transport & logistics | 2026 |
| HE Power Ltd | Construction | 2026 |
| Head Scarf Shop Ltd | Wholesale & retail | 2019 |
| Headfirst Global PLC | Administrative & support | 2023 |
| Headway Luton Ltd | Professional & scientific | 2000 |
| Health Commissioning Limited | Other services | 2012 |
| Health Companion Directory Limited | Information & communication | 2023 |
| Health Economy Solution (International) Limited | Health & social care | 2022 |
| Health Nation HN Ltd | Wholesale & retail | 2019 |
| Health Sense Plus Ltd | Health & social care | 2024 |
| Healthcare FIX Ltd | Administrative & support | 2026 |
| Healthcare Intelligence Analytics Ltd | Information & communication | 2019 |
| Healthcare Management Group Limited | Health & social care | 2017 |
| Healthpharma Ltd | Health & social care | 2005 |
| Healthwatch Luton C.I.C. | Information & communication | 2013 |
| Healthy and Wealthy With Anamaria Limited | Wholesale & retail | 2025 |
| Healthy Living Haven Ltd | Health & social care | 2024 |
| Healthy Times With KAT Limited | Arts & recreation | 2022 |
| Healuton Community Interest Company | Education | 2026 |
| Heart to Care Limited | Health & social care | 2023 |
| Heartquest Ltd | Wholesale & retail | 2025 |
| Heartuk Limited | Administrative & support | 2020 |
| Heartwealth Limited | Administrative & support | 2014 |
| Heat Scholars Ltd | Construction | 2024 |
| Heather Goldthorpe Limited | Manufacturing | 2014 |
| Heathrow Travels Limited | Other services | 2016 |
| Heating 24/7 Ltd | Construction | 2022 |
| Heating Core Limited | Construction | 2022 |
| Heating Excel Limited | Other services | 2022 |
| Heattreat Heating and Plumbing Limited | Construction | 1998 |
| Heattreat Limited | Construction | 1998 |
| Heattreat Plumbing & Heating Limited | Construction | 2005 |
| Heatwell PVT Ltd | Construction | 2015 |
| Heaven Chauffeurs Ltd | Transport & logistics | 2022 |
| Heaven Learning Academy Ltd | Education | 2023 |
| Heaven NEE Limited | Wholesale & retail | 2017 |
| Heaven's Flavour Ltd | Other services | 2018 |
| Heavenkeys Ltd | Hospitality | 2025 |
| Heavenly Luton Ltd | Hospitality | 2025 |
| Heavensline Ltd | Wholesale & retail | 2026 |
| Hebe Skin Limited | Other services | 2016 |
| Hedley Advisory Limited | Professional & scientific | 2024 |
| Heems Recruitment & Janitorial Solutions Limited | Administrative & support | 2025 |
| Hefa Properties SPV Ltd | Real estate | 2026 |
| Hefa Trading Ltd | Professional & scientific | 2022 |
| Hekaya Restaurant Ltd | Hospitality | 2024 |
| Helanna Consultants Limited | Extraterritorial | 2017 |
| Hellas Trans Ltd | Transport & logistics | 2025 |
| Hello Beautiful Prom UK Limited | Wholesale & retail | 2022 |
| Hello London Taxi Limited | Transport & logistics | 2025 |
| Hello Romania Ltd | Information & communication | 2025 |
| Hello Support Limited | Administrative & support | 2019 |
| Helloandhra Limited | Hospitality | 2024 |
| Helmar Hire Limited | Administrative & support | 2016 |
| Helmar Plant Hire Limited | Administrative & support | 2026 |
| Helmet Construction Ltd | Construction | 2018 |
| Helmex Entertainment, Leisure, and Sports (ELS) LLP | | 2026 |
| Helmex Estates LLP | | 2026 |
| Helmex Financial LLP | | 2025 |
| Helmex Global LLP | | 2025 |
| Help ME Find ME CIC | Health & social care | 2024 |
| Help ME Park and Ride Ltd | Other services | 2018 |
| Helpful Builders Ltd | Construction | 2016 |
| Helpline Metal Services Limited | Extraterritorial | 1995 |
| Hemel Foods Ltd | Wholesale & retail | 2011 |
| Hemel Scaffolding Limited | Construction | 2025 |
| Hemel Spice Limited | Hospitality | 2024 |
| Hena and Co Ltd | Real estate | 2025 |
| Hench Hemel Hempstead Ltd | Hospitality | 2023 |
| Hench Luton Ltd | Hospitality | 2023 |
| Hench Property Limited | Real estate | 2022 |
| Hench Watford Ltd | Hospitality | 2026 |
| Hendon Way Services Limited | Real estate | 2025 |
| Hendricks Removal and Storage Ltd | Transport & logistics | 2023 |
| Henley House Management Company Limited | Households | 2009 |