| H.R.P. (NO.1) Trustee Limited | London | 1992 |
| H.R.P. (NO.2) Trustee Limited | London | 1992 |
| H.S. (Air Filtration) Limited | Sidcup | 2000 |
| H.S. Line Limited | Ongar | 2021 |
| H.S.G. Holding Co Ltd | Bradford | 2010 |
| H.T International Co., Ltd | Beckenham | 2022 |
| H.T. Hughes Limited | London | 1987 |
| H.T. Motor Supplies Limited | Chichester | 2005 |
| H.T.P. Limited | Uckfield | 1991 |
| H.Tacir's Co Ltd | London | 2025 |
| H.Tonkin Limited | Sutton Coldfield | 1968 |
| H.V. Taylor & SON Limited | Newport | 1973 |
| H.W. Coates (Holdings) Limited | Lutterworth | 2009 |
| H.W. Dibben (Handley) Limited | Salisbury | 1967 |
| H.Z.C. Ltd | London | 2013 |
| H1 Touch Limited | Croydon | 2016 |
| H11A Residents Management Company Limited | London | 2019 |
| H15 AJS Limited | Staffordshire | 2023 |
| H2 Portes Topco Limited | Doncaster | 2017 |
| H2 Powerpod (Research) Ltd | Borehamwood | 2009 |
| H202U Limited | Basingstoke | 1999 |
| H20FARMING Ltd | Lancaster | 2022 |
| H2EO Coaching Limited | Lichfield | 2025 |
| H2HUB Ltd | London | 2022 |
| H2OX Limited | Bicester | 2021 |
| H4 Residents Management Company Limited | London | 2017 |
| H4 Secure Limited | Birmingham | 2023 |
| H4A Property Ltd | Hyde | 2020 |
| H4ASSOCIATESUK Ltd | Winchester | 2017 |
| H5 Residents Management Company Limited | London | 2017 |
| H52 Ltd | Birmingham | 2022 |
| H6 Developments Limited | Atherstone | 2021 |
| H7 Residents Management Company Limited | London | 2019 |
| HA Developments Ltd | Ilford | 2024 |
| HA1R Ltd | Manchester | 2023 |
| HAA Samad Bangladesh Ltd | Sheffield | 2009 |
| Haadi Mahdi Ltd | Hounslow | 2020 |
| Haak Real Estate Ltd | Hampton | 2021 |
| Haalo Evolution Ltd | East Grinstead | 2024 |
| Haas UK Limited | Norwich | 1992 |
| Haaze Invest Limited | London | 2020 |
| HAB Holdings Limited | Stratford-Upon-Avon | 2008 |
| Habeering Limited | Ilford | 2022 |
| Habeo Homes Property Sales Ltd | Westgate-On-Sea | 2023 |
| Habermas Limited | Leeds | 2012 |
| Habesha Butik Limited | London | 2022 |
| Habesha Wholesaler Ltd | Northolt | 2020 |
| Habfarms Limited | Ripley | 2017 |
| Habib Capital Limited | London | 2015 |
| Habibi's Mezze Bar Limited | Bradford | 2013 |
| Habinteg Properties Limited | Belfast | 2004 |
| Habipol Ltd | Bedford | 2023 |
| Habiru Star Bright UK Limited | London | 2022 |
| Habite 2000 Limited | Bangor | 1997 |
| Habits for Health Ltd | Maidstone | 2024 |
| Haby Webb & Media Invest Limited | London | 2019 |
| Haby Webb & Media Limited | London | 2019 |
| Habzy Heights Ltd | Nottingham | 2022 |
| HAC (London) Limited | Leamington Spa | 2025 |
| Hack the Future LAB Ltd. | London | 2020 |
| Hackbridge and Hewittic Electric Co Limited | Walton-On-Thames | 2010 |
| Hacken Limited | Kington | 2014 |
| Hackenberg & Partner Unlimited | Cardiff | 2013 |
| Hackerson Limited | Northampton | 2011 |
| Hackett Property Developments Ltd | Dalton-In-Furness | 2024 |
| Hacklingson Holdings Limited | Guildford | 2025 |
| Hackney Witch Limited | Manchester | 2016 |
| Hackthorne Services Ltd | Stourport-On-Severn | 2015 |
| Hackwood Properties Ltd | Basingstoke | 2023 |
| Hacles-Hestien Limited | Beckenham | 2020 |
| Haco Swiss Foods Limited | London | 1952 |
| Hadassah Healing Foundation UK | Rainham | 2013 |
| Hadco Limited | London | 1982 |
| Haddiscoe Country Retreat Limited | Cambridge | 2025 |
| Haddiz Ltd | Birmingham | 2024 |
| Haddon Fields (Shipston) Management Company Limited | Alcester | 2019 |
| Haddoncraft Limited | Northampton | 1991 |
| Hadee EOT Limited | Sheffield | 2026 |
| Hadenlea Limited | Bridgend | 2025 |
| Hadfield Close Residents Management Company Ltd | Wickford | 2020 |
| Hadham Engineering Limited | Bishops Stortford | 2016 |
| Hadham Securities 5 Limited | London | 2007 |
| Hadi WEN (UK) Fashion Clothing Co., Limited | Cardiff | 2017 |
| Hadji BEY Limited | Clitheroe | 2004 |
| Hadland Care Trustees Limited | Bournemouth | 2024 |
| Hadland Sustainable Education Group Limited | Bournemouth | 2024 |
| Hadleigh Limited | Harrogate | 2025 |
| Hadleigh Management Consultancy Limited | Nottingham | 2012 |
| Hadleigh Patterns Limited | Ipswich | 1972 |
| Hadley and District Funeral Services Limited | Telford | 2013 |
| Hadley Court Limited | Sevenoaks | 2006 |
| Hadley Hall Limited | Birmingham | 2013 |
| Hadley Hargreaves Limited | Presteigne | 2022 |
| Hadley Metal Processing Limited | Smethwick | 1997 |
| Hadley Park Limited | Birmingham | 2003 |
| Hadley Road (Freehold) Company Limited | Barnet | 2007 |
| Hadley Sections Limited | Smethwick | 1984 |
| Hadleynetwork Management Ltd. | London | 2026 |
| Hadrian 55 Limited | Jarrow | 2013 |
| Hadrian Holdco Ltd | Newcastle Upon Tyne | 2022 |