| Hierith Crop Nutrition (UK) Ltd | Cardiff | 2025 |
| Hifi System Components Limited | Sheffield | 2024 |
| Hifly Ltd | Telford | 2010 |
| Higgidy Limited | Melton Mowbray | 1976 |
| Higgins Bookmakers (Limavady) Ltd | | 1999 |
| Higgins Building Supplies Ltd | Llangefni | 1991 |
| Higgins Farms Limited | Doncaster | 1980 |
| Higgins Holdings Limited | Llangefni | 1991 |
| Higgins Landscape & Garden Centre Limited | Llangefni | 2012 |
| Higgins Property Developments Limited | Derry | 2007 |
| Higgins Sifton Fabrication Limited | Ayrshire | 2004 |
| High Acres Driving Academy Limited | Kingswinford | 2024 |
| High Armsheugh Ltd | Irvine | 2022 |
| High Barcaple Renewables Limited | Castle Douglas | 2014 |
| High Class Interiors Limited | Epping | 2003 |
| High Class Management Limited | Stafford | 2012 |
| High Court Limited | Cheltenham | 2015 |
| High Court Recovery Limited | Cardiff | 2014 |
| High Definition Security Ltd | Bristol | 2012 |
| High Five Loans Limited | Cardiff | 2011 |
| High Flying Birds Ltd | Harrogate | 2012 |
| High Frequency Traders Ltd | London | 2024 |
| High Green View Management Company Limited | Beverley | 2010 |
| High Growth Limited | Steventon | 2000 |
| High Hope Clothing Limited | Stevenage | 2018 |
| High Hope Int'L Group Native Produce IMP and EXP Co., Limited | Beckenham | 2018 |
| High Horizon Ltd | Nottingham | 2022 |
| High House Interiors Limited | Stanford Bridge | 2013 |
| High Lane Garage Limited | Stockport | 2012 |
| High Latitude Sailing Limited | Portchester | 2011 |
| High Oaks 1964 Limited | St. Albans | 2014 |
| High Park Garage Limited | Northampton | 1988 |
| High Path VAT Consultancy Limited | Wellington | 2011 |
| High Peak Property Group Ltd | Alfreton | 2026 |
| High Peak Sales Consultants Ltd | Derby | 2019 |
| High Performance Course Limited | Aylesbury | 2004 |
| High Performers Academy Limited | Saxmundham | 2022 |
| High Planet Limited | St John'S Wood | 1999 |
| High Platform Ltd. | London | 2015 |
| High Point Technologies UK Ltd | Colchester | 2011 |
| High Potential Limited | Falmouth | 2015 |
| High Pressure Fittings Limited | Arden Forrest Industrial Estate | 1991 |
| High Priority Limited | Harrogate | 2012 |
| High Purity Chemicals Limited | Burton Upon Trent | 2015 |
| High Road 1969 Limited | Norwich | 2014 |
| High Road Services Ltd | Cookstown | 2004 |
| High Rock Properties (Holdings) Ltd | Kingswinford | 2021 |
| High Roding Management Company Limited | Dunmow | 2017 |
| High Source Industrial Co., Ltd. | Cambridge | 2024 |
| High ST Bar Co Limited | Ventnor | 2017 |
| High Street 1959 Limited | Chichester | 2014 |
| High Street 1962 Limited | Leeds | 2014 |
| High Street 66 Limited | Orpington | 2014 |
| High Street Funeral Directors Limited | Nottingham | 2013 |
| High Street Insurance Club Limited | London | 2015 |
| High Street Standish Management Company Limited | Wigan | 2019 |
| High Street Tower Ltd | Manchester | 2023 |
| High Tech Construction Management Ltd | Dunstable | 2014 |
| High Tech Health Limited | Bracknell | 2012 |
| High Technology Composites Limited | Littleborough | 1983 |
| High UP Mountain Ltd | London | 2023 |
| High Venture Security Limited | Bristol | 2024 |
| High View Management Solutions Ltd | Guildford | 2020 |
| High Views Management Company Ltd | Warwick | 2019 |
| High VIZ Media Limited | Ashford | 2021 |
| High Voltage Energy Systems Ltd | Helsby | 2026 |
| High Welwyn Limited | Welwyn | 2019 |
| High Wheels Limited | Ilford | 2019 |
| High Wycombe Lincoln Road Centre Limited | London | 2016 |
| High Wycombe Music Activities Limited | High Wycombe | 1995 |
| Highacre Properties Limited | County Antrim | 2006 |
| Highall Construction Ltd | Poulton-Le-Fylde | 2021 |
| Highall Homes Ltd | Poulton-Le-Fylde | 2021 |
| Higham Estate Trust Company NO.1 Limited | Bury St Edmunds | 2024 |
| Higham Estate Trust Company NO.2 Limited | Bury St Edmunds | 2024 |
| Highash Farms Ltd | Northwich | 2020 |
| Highaven Limited | | 1989 |
| Highbec Limited | Angmering | 2002 |
| Highbeck Limited | Bridgend | 2026 |
| Highbeech Limited | Lydney | 2003 |
| Highbourne (IS) Limited | Northampton | 2025 |
| Highbridge (Eurocentral) Contractors Limited | Warrington | 2003 |
| Highbridge (Sherwood) Developments Limited | Warrington | 1996 |
| Highbridge (Wallsend) NO. 1 Limited | Warrington | 2002 |
| Highbridge (Wallsend) NO. 2 Limited | Warrington | 2002 |
| Highbridge (Westmoor) Securities Limited | Warrington | 2003 |
| Highbridge Classic Cars Limited | Sutton Coldfield | 2021 |
| Highbrow Consultancy Limited | Oldham | 2021 |
| Highbury.Net Limited | | 1996 |
| Highcliff Veterinary Practice Limited | Bristol | 2016 |
| Highcliffe Solutions Limited | Salford | 2019 |
| Highcroft (Hailsham) Limited | Bristol | 2007 |
| Highcross Leicester (GP) Limited | London | 2016 |
| Highcross Residential (Nominees 1) Limited | Norwich | 2008 |
| Highcross Shopping Centre Limited | Norwich | 2014 |
| Highdot Limited | London | 1989 |
| Highdown Trustees Limited | Leamington Spa | 2006 |
| Higher Access Limited | Harrogate | 2008 |
| Higher Arcade Ltd | St. Albans | 2024 |
| Higher Bents 1965 Limited | Stockport | 2014 |