| Horstmann Controls Limited | Eastleigh | 1978 |
| Horswell Holdings Ltd. | London | 2024 |
| Hortellux Limited | Birmingham | 1904 |
| Hortipak Limited | York | 1992 |
| Horton International Limited | | 1977 |
| Horton Rendering Limited | Orpington | 2025 |
| Hortonwood Trade Park Limited | Shrewsbury | 2018 |
| Horwath HTL Ltd | London | 1996 |
| Horwath UK Limited | London | 1996 |
| Horwich Challenger Ltd | Salford | 2023 |
| Horwood Pharma Consulting Ltd | Royston | 2021 |
| HOS Associates Limited | London | 2015 |
| Hosan International Limited | Beckenham | 2009 |
| Hosdo UK Trade Co., Ltd | Beckenham | 2019 |
| Hose Technik Ltd | Gloucester | 2010 |
| Hosefix Plant Hose Services (UK) Limited | Ibstock | 2011 |
| Hosey Homes Developments Ltd | Swindon | 2023 |
| Hoshlon Limited | Mill Hill | 1993 |
| Hoshmin Holding Limited | London | 2023 |
| Hoshmin Investment Limited | London | 2023 |
| Hoshmin Jardo Limited | London | 2023 |
| Hosier Electrical Limited | Omagh | 2023 |
| Hosiery World Ltd | Mitcham | 2013 |
| Hosoe Limited | London | 2016 |
| Hosparts Limited | Colchester | 2015 |
| Hospice Shops Limited | Kent | 1982 |
| Hospital Visitor Beds Limited | London | 2026 |
| Hospitality Furnishings Ltd | Feltham | 2001 |
| Hospitality Marketing Scotland Limited | Stirling | 2025 |
| Hospitality Relief Ltd | London | 2011 |
| Host Asean Ltd | London | 2015 |
| Host Europe Investments Limited | Nottingham | 2013 |
| Host FM Limited | Weston-Super-Mare | 2020 |
| Host Hospitality Management Limited | Weston-Super-Mare | 2020 |
| Host Recordings CIC | Shoreham By Sea | 2018 |
| HOST4UK, Limited | Ruislip, | 2025 |
| Hostage Support Partnership Limited | London | 2023 |
| Hostarch Limited | Bridgend | 2025 |
| Hostbristol Limited | Taunton | 2015 |
| Hostmore Group Limited | The Parklands | 2021 |
| Hostners Limited | Yarm | 2023 |
| Hostperfect Limited | Saxmundham | 1987 |
| Hostview Limited | Bridgend | 2026 |
| Hot and Cold Limited | Ruislip | 2014 |
| Hot and Tasty Ltd | Enfield | 2018 |
| Hot Bodz Limited | Walsall | 2014 |
| Hot Bottle Limited | London | 2006 |
| Hot Face Sauces Limited | Goole | 2015 |
| Hot Frog PUB Company Limited | Sittingbourne | 2025 |
| Hot Ice Limited | Station Road | 1997 |
| Hot Point International Limited | Manchester | 2015 |
| Hot Press Limited | Bristol | 2009 |
| Hot Rooster Ltd | Harrow | 2020 |
| Hot Sands Ltd | Bedlington | 2024 |
| Hot Tech Limited | Llandudno | 2012 |
| Hot Toddi Limited | York | 2015 |
| Hot Totty Ltd | Maidstone | 2012 |
| Hot Tuna IP Limited | Mansfield | 2009 |
| Hot VOX Limited | Weybridge | 2012 |
| Hot Wash UK Ltd | Wallingford | 2023 |
| Hot WOK Reading Ltd | Reading | 2016 |
| HOT45 Music Limited | Cinderford | 2000 |
| Hotchilli Internet Limited | Harrogate | 1997 |
| Hotchkins Developments Limited | Bristol | 2022 |
| Hotchkins Group Limited | Bristol | 2022 |
| Hotchkins Property Refurbishments and Specialist Care Limited | Bristol | 2022 |
| Hotchkiss Side Valve Limited | Leeds | 2013 |
| Hotdoors.Co.Uk Limited | Sawbridgeworth | 2016 |
| Hotel Action Ltd | Manchester | 2025 |
| Hotel and Industrial Cleaning Limited | Worcester Park | 2009 |
| Hotel Bell Tent Limited | London | 2023 |
| Hotel Dog Ltd | Newcastle Upon Tyne | 2014 |
| Hotel EXE Limited | Newton Abbot | 2018 |
| Hotel Katherine Ltd | Lowestoft | 2017 |
| Hotel Management Services (Manchester) Limited | Hale | 2009 |
| Hotel Property Fund (Syndicate 10) Limited | Edinburgh | 2009 |
| Hotel Property Fund (Syndicate 3) Limited | Edinburgh | 2009 |
| Hotel Property Fund (Syndicate 4) Limited | Edinburgh | 2009 |
| Hotel Property Fund (Syndicate 5) Limited | Edinburgh | 2009 |
| Hotel Property Fund (Syndicate 6) Limited | Edinburgh | 2009 |
| Hotel Property Fund (Syndicate 7) Limited | Edinburgh | 2009 |
| Hotel Property Fund (Syndicate 8) Limited | Edinburgh | 2009 |
| Hotel Property Fund (Syndicate 9) Limited | Edinburgh | 2009 |
| Hotel Services Group Ltd | Cardiff | 2022 |
| Hotel Supplies Trader Ltd | Oxford | 2018 |
| Hotfoot Investments Limited | Huddersfield | 2003 |
| Hotian Medical International Group Ltd | Stafford | 2022 |
| Hotmetal Limited | Birmingham | 1990 |
| Hotshots Limited | St. Austell | 2014 |
| Hotspur Asset Management Limited | Pencoed | 2011 |
| Hotspur Technology Limited | Bedlington | 1986 |
| Hott Box Ltd | Ilford | 2023 |
| Hotter Than Hell Ltd | London | 2023 |
| Hotview Company Limited | London | 2015 |
| Houdini Marine Windows Limited | Norwich | 2023 |
| Houghton Garage Limited | Leicester | 1984 |
| Houghton Hall Farm Limited | Sudbury | 1939 |
| Houghton Service Station Holdings Limited | Leicester | 2019 |
| Houlder Investments Limited | London | 1997 |
| Houlder Offshore Limited | London | 1997 |