| A.Botofei Ltd | Birmingham | 2025 |
| A.C Autotrimmers Limited | Pontypool | 2016 |
| A.C Hair Loss Bristol Limited | Bristol | 2025 |
| A.C. and B.M. Enterprises Limited | Liskeard | 1991 |
| A.C. Causer Property Maintenance Ltd | Bridgnorth | 2019 |
| A.C. Foreman Limited | London | 1951 |
| A.C. Linen & Laundry Services Limited | Glasgow | 2018 |
| A.C. Property Maintenance Limited | N E Lincolnshire | 1996 |
| A.C.A.Trustee Company Limited(The) | Leominster | 1948 |
| A.C.E. Stainless Fabrications Limited | Derby | 2007 |
| A.C.Framing Limited | Huddersfield | 1970 |
| A.C.L. Locksmiths Limited | Dunstable | 2002 |
| A.C.Ldn Ltd | London | 2024 |
| A.C.R.N. Limited | Maidstone | 2015 |
| A.C.T. Property Holdings Ltd | Salisbury | 2016 |
| A.Cain(Funeral Services)Limited | Maidenhead | 1963 |
| A.D Aesthetics Fife Ltd | Kirkcaldy | 2021 |
| A.D Sprinkler Protection Limited | Manchester | 2006 |
| A.D. Hamilton & Co. Limited | | 1991 |
| A.D. Walker Funeral Directors Limited | Banff | 2016 |
| A.D.E Estate Planning Limited | Aylesbury | 2023 |
| A.D.K. Kooling Ltd | Uxbridge | 2006 |
| A.D.L Building Services Ltd | Chatham | 2016 |
| A.D.M Project Consultancy Ltd | Exeter | 2012 |
| A.D.S Construction Personnel Ltd | Bedford | 2021 |
| A.D.T. Northumberland Limited | Morpeth | 1999 |
| A.Davies Group CYF. | Swansea | 2025 |
| A.Dc.Soliman Ltd | Thornton Heath | 2019 |
| A.Dolby Funeral Services Limited | Nottinghamshire | 2004 |
| A.E Enterprises Limited | Birmingham | 2010 |
| A.E. (Estate Developers) Limited | Canterbury | 1936 |
| A.E. Dixon & SON Limited | Lancashire | 1937 |
| A.E. Stoodley & SON Limited | Axminster | 2004 |
| A.E.Bennett and Sons | | 1955 |
| A.E.M Trading Limited | Leigh-On-Sea | 2006 |
| A.E.M.T.Limited | York | 1945 |
| A.E.P Wastewater Ltd | Loughborough | 2024 |
| A.E.S. Rewinds Limited | Epsom | 1952 |
| A.E.W. Property Services Ltd | Upminster | 2010 |
| A.Elraggal Ltd | St. Asaph | 2025 |
| A.Emms Limited | Hockley | 2023 |
| A.F Refrigeration (UK) Ltd | Ruislip | 2012 |
| A.F Refrigeration Group UK Limited | Ruislip | 2024 |
| A.F. Brown & Sons Limited | Plymouth | 2000 |
| A.F.B. Heating and Airconditioning Ltd | Ilford | 2004 |
| A.F.S Finnieston Ltd | Glasgow | 2021 |
| A.F.S. Fire & Security Ltd | High Wycombe | 2008 |
| A.F.S. Fire Services Ltd | Ipswich | 2011 |
| A.France & Son(Holborn)Limited | | 1938 |
| A.G Mead & Sons Ltd | Semington | 2023 |
| A.G Philips UK Ltd | London | 2011 |
| A.G. Cross Limited | Poulton-Le-Fylde | 2002 |
| A.G. Down Limited | Dorset | 1962 |
| A.G. Evans Ltd. | Hertfordshire | 1997 |
| A.G. Glamour Limited | Glasgow | 2012 |
| A.G. Mark Investments Limited | London | 2021 |
| A.G. Plateware Limited | Hainault, Ilford | 1991 |
| A.G.A. Cleaning Ltd | Hatfield | 2017 |
| A.G.A. Group Consultancy Limited | Thetford | 2018 |
| A.G.S. GAS Limited | Alcester | 2004 |
| A.G.S. Tech Limited | Blackburn | 2003 |
| A.Gupta & Co. (Acca) Ltd | Edgware | 2019 |
| A.H Hairdressing Limited | Harpenden | 2022 |
| A.H Worldwide Marketing Ltd | London | 2022 |
| A.H. Cheater Limited | Romsey | 2010 |
| A.H.G Assets Ltd | Rotherham | 2022 |
| A.H.Parker & Sons (Gt.Britain) Limited | Kingston Upon Thames | 1940 |
| A.I. Technology Systems Ltd | London | 2021 |
| A.I.H. Consulting Limited | Swindon | 2022 |
| A.I.S Laundry Ltd | London | 2026 |
| A.Ismael & Sons Limited | Dagenham | 2017 |
| A.J Blue Nile Ltd | Glasgow | 2020 |
| A.J Cuts Ltd | Smethwick | 2024 |
| A.J. Beal Hair Design Limited | Ferndown | 2005 |
| A.J. Brooke Funeral Directors Ltd | Ascot | 2009 |
| A.J. Cook & SON Limited | West Midlands | 2003 |
| A.J. Donald Roofing Services Ltd | Maldon | 2005 |
| A.J. Doors and Systems Limited | Donaghmore | 2026 |
| A.J. Lloyd Funeral Directors Limited | Coventry | 2006 |
| A.J. Purdie Limited | Livingston | 2003 |
| A.J. Read Upholstery Limited | Cambridge | 2014 |
| A.J. Sellman Limited | Staffordshire | 1967 |
| A.J. Tracy (Funeral Directors) Ltd | Alton | 1997 |
| A.J.D.N Limited | Haverhill | 2022 |
| A.J.Lucas Plumbing & Heating Ltd | Holmfirth | 2015 |
| A.K Barber London Ltd | London | 2026 |
| A.K. Graham Electrics Limited | Motherwell | 1990 |
| A.K. Wright Limited | New Mills | 1955 |
| A.K.A. Hair Tools Limited | Aberdeen | 2006 |
| A.K.J Services (UK) Limited | Crewe | 2007 |
| A.Kawara Limited | Leeds | 2018 |
| A.Kutz Ltd | Wembley | 2021 |
| A.L Barbers Ltd | Enfield | 2023 |
| A.L Physio Ltd | Bury | 2024 |
| A.L. Medical Academy Limited | Wolverhampton | 2017 |
| A.L.B. Services Ltd | London | 2015 |
| A.L.C. Mixology Limited | London | 2024 |
| A.L.E Locksmiths Ltd | London | 2018 |
| A.L.E. (Plymouth) Limited | Slough | 2003 |
| A.L.I.G.N. 360 Limited | London | 2024 |