| Haney Property Investment Ltd | Real estate | 2021 |
| Hanlake Services Limited | Professional & scientific | 2018 |
| Hanmore Technical Solutions Limited | Information & communication | 2019 |
| Hanna Kucper Limited | Arts & recreation | 2005 |
| Hannah Nails & Beauty Limited | Other services | 2016 |
| Hannan IT Consultancy Ltd | Information & communication | 2025 |
| Hannys Cosmetics Academy Ltd | Education | 2023 |
| Hans Vault Ltd | Wholesale & retail | 2026 |
| Hanuman Bapa LLP | | 2012 |
| HAO Trang Limited | Other services | 2019 |
| Happi Creative Group Ltd | Financial services | 2019 |
| Happy Moonstar Ltd | Wholesale & retail | 2025 |
| Happy Nails Knaphill Limited | Other services | 2023 |
| Happywoods Bell Lane Limited | Health & social care | 2019 |
| Happywoods Nursery (South Woodford) Limited | Education | 2026 |
| Happywoods Nursery Limited | Education | 2016 |
| Haqe Analytics Limited | Information & communication | 2025 |
| Harambe Ltd | Wholesale & retail | 2015 |
| Harasa Limited | Real estate | 2023 |
| Harbest Locums Ltd | Health & social care | 2010 |
| Hard Down Ltd | Hospitality | 2021 |
| Hardnose LP | | 2019 |
| Hardstone Heating Ltd | Construction | 2024 |
| Harimau ZEN Ltd | Health & social care | 2024 |
| Harkirpa Limited | Health & social care | 2013 |
| Harley Cosmetics London Limited | Other services | 2022 |
| Harley Electrical Contracting Limited | Construction | 2016 |
| Harley Gayle Ltd | Hospitality | 2014 |
| Harmony Care Group Limited | Public administration | 2024 |
| Harmony Nail and Beauty Ltd | Other services | 2017 |
| Harper Ashby Bowles Limited | Professional & scientific | 2020 |
| Harris Homes Group Ltd | Real estate | 2021 |
| Harris Homes Limited | Construction | 2004 |
| Harris Kilma Property Investments Limited | Real estate | 2021 |
| Harry Nicolaou & Co Limited | Professional & scientific | 2002 |
| Harry Nicolaou & Co Probate Limited | Professional & scientific | 2021 |
| Harry Pham Ltd | Other services | 2021 |
| Harry's Cafe Ltd | Hospitality | 2019 |
| Harry's Kicks Ltd | Wholesale & retail | 2021 |
| Harry's Take-Away (ST Albans) Limited | Hospitality | 2008 |
| Hartex Limited | Real estate | 2015 |
| Hartlane Ltd | Construction | 2025 |
| Harver Packaging Co. Limited | Extraterritorial | 1970 |
| Hasan Butcher Ltd | Wholesale & retail | 2020 |
| Hashtag Blinds Ltd | Other services | 2015 |
| Hasmotas Ltd | Administrative & support | 2013 |
| Hasp Ltd | Wholesale & retail | 2017 |
| Hasrose Ltd | Real estate | 2024 |
| Hassan Enterprice Limited | Wholesale & retail | 2019 |
| Hassen Limited | Hospitality | 2025 |
| Hassos Doner Ltd | Hospitality | 2024 |
| Hastech Management Ltd | Real estate | 2021 |
| HAT Group Limited | Wholesale & retail | 2017 |
| HAT Property & Land Investments Limited | Real estate | 2022 |
| Hatfield Hilltop Partners Ltd | Wholesale & retail | 2025 |
| Hathi Autos Limited | Wholesale & retail | 2016 |
| Hathi Claims Ltd | Professional & scientific | 2008 |
| Haul Purpose Transportation Ltd | Transport & logistics | 2025 |
| Hausboot UK Ltd | Manufacturing | 2018 |
| HAUTE93 Ltd | Wholesale & retail | 2024 |
| Havancare Ltd | Health & social care | 2012 |
| Havin Limited | Hospitality | 2009 |
| Hawk Alarms & Security Limited | Administrative & support | 2005 |
| Hawksgrove Estates Ltd | Real estate | 2022 |
| Hawksgrove Group Ltd | Financial services | 2022 |
| Hawksgrove Management Ltd | Real estate | 2022 |
| Hawx & Onyx Ltd | Transport & logistics | 2018 |
| Haxhiu Holdings Ltd | Information & communication | 2025 |
| Haxsa UK Import and Export Ltd | Wholesale & retail | 2020 |
| Hayati Cleaning Ltd | Construction | 2025 |
| Haydar Investment & Co Ltd | Real estate | 2026 |
| Haylee Nails & Beauty Limited | Other services | 2019 |
| Hayleyville Ltd | Professional & scientific | 2005 |
| Haylo Day Care Ltd | Health & social care | 2023 |
| Haysel Limited | Wholesale & retail | 2017 |
| Hayu Jewels Ltd | Wholesale & retail | 2025 |
| Hayward Maintenance Properties Limited | Real estate | 2015 |
| Hayward Maintenance Services Limited | Manufacturing | 2001 |
| Hazak Properties Ltd | Real estate | 2022 |
| Hazal Turap Guler Ltd | Real estate | 2022 |
| Haze Limited | Wholesale & retail | 2010 |
| Hazelgreen Garden Services Ltd | Administrative & support | 2026 |
| Hazelmoor Ltd | Extraterritorial | 2007 |
| Hazelnut Holdings Ltd | Households | 2016 |
| HB Global Consultants Limited | Professional & scientific | 2024 |
| HB Plumbing Limited | Construction | 2021 |
| HBC Wholesale Ltd | Wholesale & retail | 2026 |
| HBL GAS Ltd | Construction | 2018 |
| Hbms.K Ltd | Other services | 2020 |
| HBN Ltd | Other services | 2019 |
| HC Plus Limited | Wholesale & retail | 2026 |
| HC Resources Limited | Administrative & support | 2018 |
| HCK Catering Ltd | Hospitality | 2026 |
| HCS (Enfield) Limited | Health & social care | 1991 |
| HCS Domiciliary Care Limited | Administrative & support | 2017 |
| HD Edmonton Ltd | Other services | 2024 |
| HD London Nails & Beauty Limited | Other services | 2016 |
| HD Nails & Spa Limited | Other services | 2017 |
| HD Nails Limited | Other services | 2019 |
| HD Produce Limited | Wholesale & retail | 2021 |