| A.J.D. Engineering Limited | Ipswich | 1984 |
| A.J.D. Marine Electrical Services Limited | Chandler'S Ford | 2016 |
| A.J.Gilbert Limited | Solihull | 2016 |
| A.J.Glassfibre Limited | Wakefield | 1999 |
| A.J.H. Precision Limited | Towers Business Park Rugeley | 1997 |
| A.J.M. Engineering Limited | Corsham | 1981 |
| A.J.M. Plumbing & Heating Services Ltd | Cinderford | 2009 |
| A.J.P. Aviation Ltd | Warminster | 2008 |
| A.J.S Agri Ltd | Bridport | 2024 |
| A.J.S. GAS & Heating Services Ltd | Colchester | 2002 |
| A.J.S. Manufacturing Limited | Essex | 2000 |
| A.J.Steel Fabrications Limited | Driffield | 2001 |
| A.J.T. Equipment Limited | Brierley Hill | 1951 |
| A.J.Wood GAS Ltd | Stoke-On-Trent | 2013 |
| A.K Garage Ltd | Wolverhampton | 2013 |
| A.K Marine Services Ltd | Dorset | 2020 |
| A.K Office Installation Ltd | Nuneaton | 2017 |
| A.K. Bryan Mould Engineers Limited | Sutton-In-Ashfield | 1993 |
| A.K. Engineering (Nottingham) Limited | Ilkeston | 2003 |
| A.K. Garments Limited | Manchester | 2001 |
| A.K. Lander Limited | Westerleigh Road Westerleigh | 1998 |
| A.K. Stoddart Limited | Broxburn | 1959 |
| A.K.A Interiors Limited | Keighley | 2014 |
| A.K.F. Tooling and Moulds Limited | Coventry | 1997 |
| A.K.Hughes Limited | Aylesbury | 1962 |
| A.Keller & Sons(Hydraulics)Limited | London | 1962 |
| A.L Inspections Ltd | Bolton | 2025 |
| A.L. Engineering Ltd | Wirral | 2021 |
| A.L. Print Limited | Birmingham | 2020 |
| A.L.C Engineering & Industrial Services Ltd | Kirkcaldy | 2022 |
| A.L.C Offshore Services Ltd | Wirral | 2024 |
| A.L.F. Metalcraft Ltd | Stanmore | 2018 |
| A.L.H. Heritage Joinery Ltd | Penarth | 2024 |
| A.L.K. Print Limited | Bilston | 2000 |
| A.L.M Architectural Moulds Ltd | Staffordshire | 2007 |
| A.L.M Joinery Projects Ltd | Newcastle Upon Tyne | 2024 |
| A.L.M. Products Limited | Newton Aycliffe | 1994 |
| A.L.M.A Razaq Ltd | Birmingham | 2022 |
| A.L.M.C Ltd | London | 2024 |
| A.L.M.E.C Services Ltd | Rotherham | 2023 |
| A.L.N. Heating Limited | Oxford | 2003 |
| A.L.P Creative Ltd | Pulborough | 2012 |
| A.L.P Management Solutions Ltd | Pulborough | 2012 |
| A.L.P.S. Engineering Company Limited | Aberdeen | 1994 |
| A.L.S. (Scotland) Ltd | Clydebank | 2017 |
| A.L.S. Presentation Limited | Berkshire | 1992 |
| A.L.S. Recovery Ltd | St Albans | 2001 |
| A.L.Simpkin & Co.Limited | Sheffield | 1929 |
| A.L.T. Electrical Installations Ltd | Stockton-On-Tees | 2017 |
| A.L.T. Saws and Spares Limited | Gillingham | 2005 |
| A.Larkin(Concrete)Limited | Mitcham | 1956 |
| A.Lyle.Services Limited | Burnley | 2016 |
| A.M Blade Repair Ltd | Salford | 2024 |
| A.M Kitchens and Wardrobes Ltd | Nelson | 2022 |
| A.M Mobile Tyres Ltd | Epping | 2022 |
| A.M Watkinson Ltd | Tetbury | 2023 |
| A.M. Aluminium Ltd | Bradford | 2014 |
| A.M. Aviation Services Ltd | Haverhill | 2016 |
| A.M. Electrics Limited | Hungerford | 1994 |
| A.M. Handling Limited | Harrogate | 1995 |
| A.M. Packaging Limited | Gainsborough | 1980 |
| A.M. Products Trading Company Limited | Bath | 1999 |
| A.M. Profiles Limited | Enderby | 1988 |
| A.M. Robb Limited | Wellington | 1987 |
| A.M. Seafoods Limited | Manchester | 2003 |
| A.M. Strafford and Sons Limited | Chorley | 1980 |
| A.M. Transformers Limited | Maidenhead | 1998 |
| A.M.Brown Ltd | Eastbourne | 2006 |
| A.M.C Carpenters and Builders Ltd | Aylesford | 2017 |
| A.M.C+ Ltd | Birmingham | 2013 |
| A.M.C. Sheet Metal Fabrications Limited | Worthing | 1984 |
| A.M.E. Pressure Die-Casting Limited | West Bromwich | 1999 |
| A.M.Embroidery Ltd | R.C.T. | 2004 |
| A.M.F. Mobile Maintenance Ltd | Bristol | 2004 |
| A.M.H. Electronic Services Limited | Stoke On Trent | 1997 |
| A.M.H. Precision Tools Limited | High Peak | 1970 |
| A.M.J. Limited | Southport | 1987 |
| A.M.K. Maintenance Services Ltd | Middlesex | 2007 |
| A.M.M.E. Limited | Birmingham | 1981 |
| A.M.P Automation Ltd | Gainsborough | 2019 |
| A.M.P. Rose Limited | Gainsboough | 1995 |
| A.M.Philpot(Hard Chrome)Limited | Cradock Road, Luton | 1961 |
| A.M.Prototype Services Limited | Kenilworth | 2010 |
| A.M.R Services Ltd | Luton | 2018 |
| A.M.R. Heating Limited | London | 2002 |
| A.M.R. Industries Ltd. | Scunthorpe | 2018 |
| A.M.S. Plumbing Limited | Ossett | 2013 |
| A.M.T. Ltd | Dewsbury | 2003 |
| A.Moss (Electrical & Mechanical Services) Limited | Essex | 1997 |
| A.N Electrician Ltd | Lincoln | 2025 |
| A.N. Standard Limited | Middlemore Road Smethwick | 1987 |
| A.N. Technology Limited | Wallingford | 1987 |
| A.N.F. Limited | Cramlington | 1991 |
| A.N.G Refrigeration S.R.K Limited | Birmingham | 2017 |
| A.N.P. Raceworks Ltd | Oxford | 2021 |
| A.N.T. Welding Limited | Stourbridge | 2005 |
| A.North Blade Repairs Ltd | Newport | 2024 |
| A.O.A Print Ltd | Bradford | 2021 |
| A.O.M Tech Limited | Bristol | 2025 |
| A.O.N. Converters Limited | Litherland | 1982 |