| H Nicholl and Sons Limited | Co.Londonderry | 1958 |
| H P Contracts Limited | Salisbury | 2006 |
| H P Subsidiary Limited | London | 2009 |
| H Page Engineering Services Limited | Bromley | 2011 |
| H Page Limited | Bromley | 2011 |
| H Peasgood & SON Limited | Bishop'S Stortford | 2009 |
| H R Heads Limited | Southampton | 2012 |
| H S Industrial Group Limited | Glasgow | 2008 |
| H S Secretaries Limited | Sheffield Business Park | 2004 |
| H Shields Limited | Cardiff | 2026 |
| H Stones & Grandson Ltd | Cleethorpes | 2017 |
| H Thornton (NW) Limited | Oldham | 2020 |
| H Turpin Ltd | Newton Abbot | 2023 |
| H Two EAU Limited | Southampton | 2013 |
| H V Building Services Limited | Stourbridge | 1985 |
| H W & W Ltd | Cardiff | 2011 |
| H W F Number Five Limited | Surbiton | 1985 |
| H W F Number Sixty Four Limited | London | 1987 |
| H W Invest Limited | Hitchin | 2016 |
| H&A Brothers Co., Ltd | London | 2015 |
| H&A Garage Ltd | Deeside | 2022 |
| H&A Screen Ltd | Magherafelt | 2013 |
| H&B Accountancy Services Limited | Ipswich | 2004 |
| H&B Compagniet Ltd | London | 2008 |
| H&B Electrical Servicing Ltd | Newcastle-Under-Lyme | 2024 |
| H&B Europe Limited | Sherborne | 2009 |
| H&B Ltd | Brecon | 2022 |
| H&F Traders (UK) Limited | Romford | 2011 |
| H&H Bros Ltd | Amersham | 2019 |
| H&I Capital Ltd | East Grinstead | 2025 |
| H&J Holdings (Lincs) Ltd | Grimsby | 2024 |
| H&Pce Limited | Teddington | 2008 |
| H&Q Associates Ltd | London | 2017 |
| H&S Business Consultancy Ltd | London | 2023 |
| H&S Heritage Homes Ltd | Halstead | 2024 |
| H&W Cleaning Services Ltd | Westbury | 2018 |
| H&W Industrial Co., Limited | Beckenham | 2014 |
| H&X Optical Co., Ltd. | Cardiff | 2019 |
| H'Art and Crafts Ltd | Bristol | 2023 |
| H-E Secretaries Limited | Croydon | 2009 |
| H-Modul Limited | High Wycombe | 2005 |
| H-Te Controls Limited | Newbury | 1997 |
| H. & C. Merchandising Equipment Limited | Stockport | 1977 |
| H. Ballard & SON (Motors) Limited | Montgomeryshire | 1964 |
| H. C. Webb & Co. Limited | Redditch | 2009 |
| H. D. Drilling Services Limited | Market Rasen | 2016 |
| H. Dorricott and J. Bent Limited | Glasgow | 1989 |
| H. Eaton and Sons Holdings Limited | Sutton Coldfield | 2016 |
| H. F. Investments Limited | Leatherhead | 1985 |
| H. H. Limited | Manchester | 1952 |
| H. Hill Funeral Service Limited | Sutton Coldfield | 1980 |
| H. Lakew Electrical Installation Services Ltd | Manchester | 2022 |
| H. M. Whittle (Holdings) Limited | Lancashire | 1972 |
| H. S. (Environmental) Ltd | Sidcup | 1994 |
| H. Squared Electronics Limited | Newbury | 1979 |
| H. Steade & Sons Limited | Berkshire | 1994 |
| H. Towell Ltd | Birmingham | 2005 |
| H. V. Bowen & Sons (Transport) Limited | Derby | 1987 |
| H. W. Miller Limited | Bedworth | 1941 |
| H. Young (Europe) Limited | Berkshire | 2005 |
| H.A.Harrold & SON Limited | Sutton Coldfield | 1958 |
| H.A.Mason(Metals)Limited | Dudley | 1960 |
| H.A.S Group Ltd | Northampton | 2024 |
| H.A.S. Properties Limited | Wolverhampton | 2001 |
| H.A.S. Scaffold Ltd | Northampton | 2024 |
| H.B.S. (Services) Limited | Blackpool | 1996 |
| H.Boswell & Co.Limited | Reading | 1930 |
| H.Burden Pension Trustees Limited | Oxford | 2004 |
| H.C.Chambers & SON Limited | Newcastle Upon Tyne | 1937 |
| H.C.S. Boone Limited | Cheshire | 1965 |
| H.Copeland & SON Limited | Sutton Coldfield | 1948 |
| H.D.M. Personnel Limited | London | 1987 |
| H.D.M.C. (Conferencing) Limited | Harrow | 2001 |
| H.E. Construction Services Limited | Kent | 2006 |
| H.E. Services Limited | Rochester | 2007 |
| H.E.P Plant Ltd | Bankfoot | 2023 |
| H.E.R.S. (Heating Equipment Replacement Services) Limited | Edgware | 1978 |
| H.Eaton & Sons Limited | Sutton Coldfield | 1962 |
| H.F. Luxford Investments Ltd | Southampton | 2011 |
| H.F.E Limited | Keighley | 2014 |
| H.G. Blake Ltd | Norwich | 2017 |
| H.G. Harris Funeral Directors Ltd | Bristol | 2023 |
| H.G. Scadgell Limited | Horley | 1933 |
| H.G. Sites (DSA4) Limited | Scunthorpe | 2021 |
| H.G. Stephenson (Holdings) Limited | Stockport | 2001 |
| H.G.Brown & Sanders,Limited | Sutton Coldfield | 1938 |
| H.J. Dawson Limited | Sutton Coldfield | 1940 |
| H.J. Foodstores Limited | Sunderland | 1993 |
| H.J. Hussey Limited | Dorchester | 2007 |
| H.J. Whalley & Sons Limited | Sutton Coldfield | 2000 |
| H.J.Knee of Malmesbury Limited | Trowbridge | 1958 |
| H.J.Phillips & Son(Funeral Directors)Limited | Sutton Coldfield | 1947 |
| H.J.S. Systems Engineering Limited | Morpeth | 1998 |
| H.K Detailing Ltd | Burnley | 2021 |
| H.Leslie Humphreys Limited | Sutton Coldfield | 1957 |
| H.M. Tickler Limited | Faversham | 1955 |
| H.N.F. Limited | Epsom | 2012 |
| H.N.V. Professional Services Limited | Salisbury | 1985 |
| H.R. Owen Classics Limited | London | 2015 |
| H.R.H. Holdings Limited | Sutton Coldfield | 1995 |