| Hathorn,Davey and Company,Limited | | 1901 |
| Hato Labo (UK) Ltd | Swindon | 2014 |
| Hatstand Opera Limited | Eastleigh | 1994 |
| Hattain International Trading Limited | Beckenham | 2023 |
| Hatter Street Nominees Ltd | Manchester | 2016 |
| Hattersley Valve Co., Limited | Kenilworth | 2016 |
| Hattersley Valve Trade Co., Ltd | Kington | 2024 |
| Hattie Gemma Doris Afshar Limited | Waterlooville | 2022 |
| Hatton & Garden Ltd | Harrow | 2025 |
| Hatton Biofuels Ltd | Fraserburgh | 2022 |
| Hatton Building Contractors Ltd | Wigan | 2020 |
| Hatton Garden Auction (London) Ltd | Mildenhall | 2023 |
| Hatton Garden Safe Deposit Ltd | Dover | 2023 |
| Hatton Jewellery Ltd | Leigh-On-Sea | 1998 |
| Hatzola UK Ltd | Edgware | 2015 |
| Hauck Developments Limited | Oldham | 1988 |
| Haugberg Konsulenttjenester Limited | London | 2015 |
| Haughton's Hall Management Ltd | Coleraine | 2016 |
| Haugsland Maskin Invest Limited | London | 2025 |
| Haugsland Maskin Limited | London | 2025 |
| Hauk Ltd | London | 2017 |
| Hauk NV Ltd | London | 2017 |
| Haul My GG Limited | Aberdeen | 2016 |
| Hauland Limited | London | 2015 |
| Haulboline Shellfish Limited | Belfast | 2007 |
| Haunting Visions Limited | Farnham | 2020 |
| Hauptwerk Hardware Ltd | London | 2026 |
| Hauraizen Group Ltd | London | 2024 |
| Haus Hotels Limited | Bangor | 2017 |
| Haus of Beauty Kidderminster Ltd | Kidderminster | 2024 |
| Haus of Henry Ltd | Bristol | 2019 |
| Haus of Thrills Ltd | Barnsley | 2024 |
| Hausco Limited | North Shields | 2021 |
| Hausmade Ltd | Huntingdon | 2026 |
| Haussmith Limited | Mildenhall | 2023 |
| HAUSUNDHOF55 Limited | London | 2016 |
| Hausverwaltung Hooijer Ltd | Manchester | 2023 |
| Hauxley Consulting Ltd | Redcar | 2023 |
| HAV Technologies Limited | Glasgow | 2019 |
| Hava Consulting Limited | London | 2024 |
| Havana Atmosphere Limited | Eastbourne | 2023 |
| Havana Trading NO.10 Limited | Belfast | 2017 |
| Havana Trading NO.6 Limited | Belfast | 2017 |
| Havana Trading NO.7 Limited | Belfast | 2017 |
| Havana Trading NO.8 Limited | Belfast | 2017 |
| Havana Trading NO.9 Limited | Belfast | 2017 |
| Havant Assets (NO 2) Limited | Manchester | 2012 |
| Havant Assets Limited | Manchester | 2012 |
| Havant LL Limited | Manchester | 2001 |
| Havant Park Estates Limited | Pulborough | 1959 |
| Havards Limited | Abingdon | 2000 |
| Havelock RTM Company Limited | Brighton | 2023 |
| Havelocks Shoes Ltd | Edenbridge | 2010 |
| Haven & Hearthstone Ltd | Coventry | 2025 |
| Haven Bloom Ltd | Birmingham | 2025 |
| Haven Country Supplies Limited | Lincoln | 2024 |
| Haven Direct Limited | Potters Bar | 2017 |
| Haven Funeral Services Limited | Nottingham | 2011 |
| Haven Heating Limited | Potters Bar | 2017 |
| Haven Homes Limited | Solihull | 1982 |
| Haven Marine Limited | Felixstowe | 2010 |
| Haven Mews Management Limited | London | 2003 |
| Haven Online Limited | Potters Bar | 2017 |
| Haven Properties Ltd. | London | 2000 |
| Haven Rest Homes Limited | East Sussex | 1981 |
| Haven Retirement Homes Ltd | York | 1976 |
| Haven Thrust Global Investments Ltd | Manchester | 2026 |
| Havencrest Trading Limited | London | 2025 |
| Havencrown Marquee Washing Machines Limited | Wimborne | 2016 |
| Havenside Equity Limited | Salford | 2017 |
| Havenstride Limited | London | 2025 |
| Haverfordwest Assets (NO 2) Limited | Manchester | 2020 |
| Haverfordwest Assets Limited | Manchester | 2020 |
| Haverhill Property Management Services Ltd | Litlington | 2015 |
| Havers Park Bowling and Tennis Club Limited(The) | Bishop Stortford | 1917 |
| Haversham Publications Limited | Witham | 1989 |
| Haveyoubeenletdown.Com Ltd | Liverpool | 2014 |
| Havila Group Holding Limited | London | 2024 |
| Havin Yachting Ltd | London | 2025 |
| Havision Import and Export Company Limited | London | 2025 |
| Havnest Limited | | 2007 |
| Havwoods Accessories Limited | Preston | 2021 |
| HAW Enterprise Limited | London | 2022 |
| Hawaii FIVE-0 (UK) Limited | Berkshire | 1976 |
| Hawaii Five-O Limited | Berkshire | 1957 |
| Hawaiian Adventure Ltd | London | 2020 |
| Hawar Goudarzpour Ltd | London | 2023 |
| Hawas Disaster Relief Ltd | Croydon | 2024 |
| Hawb Development Limited | Windsor | 2009 |
| Hawes & Paws Limited | Bristol | 2019 |
| Hawick Development Corporation Limited | Huntingdon | 1991 |
| Hawick Plant & Tool Hire Centre Limited | St. Ives | 2003 |
| Hawk & Hart Ltd | Welwyn Garden City | 2026 |
| Hawk Carpentry Limited | Norwich | 2025 |
| Hawk Incentives Trust Company Limited | Hemel Hempstead | 1996 |
| Hawk Information Services Limited | Moreton-In-Marsh | 2012 |
| Hawk Management Group Limited | Twickenham | 2016 |
| Hawk Networks Ltd | Woodbridge | 2011 |
| Hawk Property Ventures Limited | Newport | 2015 |
| Hawk Recovery Ltd | Cardiff | 2013 |