| A. Luvisiah and Company Ltd | Colchester | 2014 |
| A. M. & R Psychiatric Consultancy Limited | Taunton | 2012 |
| A. M. Refrigeration Limited | Grimsby | 2020 |
| A. Majeed & Co Ltd | Harrow | 2025 |
| A. Marshall Consulting Limited | Bristol | 2007 |
| A. Mccoull & Co. Limited | Newcastle Upon Tyne | 1972 |
| A. Mcewan Services Limited | Cheshire | 2006 |
| A. Metathron Ltd | London | 2005 |
| A. Mireku Limited | Ebbsfleet | 2015 |
| A. Monk & Company Developments (S.W.) Limited | York | 1967 |
| A. N. B. Signs Ltd | | 2005 |
| A. Neaverson & Sons Limited | London | 1934 |
| A. Nicastro Engineering Limited | London | 2003 |
| A. Nicol & Company (Holdings) Limited | Fife | 1963 |
| A. Norman Tate & Co. Limited | Liverpool | 1957 |
| A. O. Boobe Ltd | Bristol | 2019 |
| A. Ozturk Accountancy Limited | Sheffield | 2020 |
| A. P. Bamford Limited | Staffordshire | 2004 |
| A. P. Learning Solutions Ltd | Evesham | 2019 |
| A. P. S. (Holdings) Limited | Sandys Road, Malvern | 1984 |
| A. P. Sweeney Construction Ltd | Edinburgh | 2014 |
| A. Patel & Co (NW) Limited | Greater Manchester | 2003 |
| A. Paul Services Limited | Maidstone | 2014 |
| A. Performance Consultancy Ltd | Edinburgh | 2020 |
| A. Qayyum Accountants Ltd | Luton | 2013 |
| A. R. & H. Accountancy Services Limited | Nottingham | 2009 |
| A. R. C. D. Associates Limited | Ipswich | 2002 |
| A. R. Jackson Consulting Ltd | Lanark | 2023 |
| A. R. Mclean Building & Project Management Services Limited | Leeds | 2015 |
| A. Raymond Limited | Warwick | 1990 |
| A. Roberts Properties Limited | | 1956 |
| A. Robinson Associates Limited | Deal | 2002 |
| A. Rutherford Consulting Ltd | Newcastle Upon Tyne | 2024 |
| A. S. Zanettos & Co. Limited | London | 2007 |
| A. Sacranie & Associates Limited | Edinburgh | 2024 |
| A. SHAIKH1 Engineering Limited | Huddersfield | 2013 |
| A. SIM Design Limited | Aberdeen | 2012 |
| A. SYN Consulting Ltd | London | 2021 |
| A. T. (Lytham) Limited | Lancashire | 1988 |
| A. V. Hoyer Ltd | London | 2018 |
| A. Vlies Limited | Altrincham | 2003 |
| A. W. (Hardwoods) Ltd. | Swansea | 2005 |
| A. W. Brindle & Company Limited | Bolton | 1976 |
| A. W. Champion Contracting Limited | New Malden | 1956 |
| A. Wellsolutions Limited | Manchester | 2015 |
| A. Wilkie Project Management Services Ltd | Middlesex | 2007 |
| A.& a. O'Neill Ltd | Northampton | 2009 |
| A.A Wellbeing Co. Ltd | London | 2026 |
| A.A. Ballantyne Limited | Co Tyrone | 2004 |
| A.A. Company Services Limited | London | 1989 |
| A.A. Fisher (Holdings) Limited | Watford | 2005 |
| A.A. Narrative Interiors Ltd | London | 2026 |
| A.A. Toys Ltd | Harrogate | 2009 |
| A.A.C. (Road Markings) Limited | Solihull | 1991 |
| A.A.D Corp Ltd | London | 2022 |
| A.A.E.A.J. Claessen Limited | Taunton | 1996 |
| A.A.Fisher Limited | Wiggenhall Road Watford | 1927 |
| A.A.H.T Limited | Birmingham | 2019 |
| A.A.Hafezi Limited | Ilford | 2015 |
| A.A.Mangat & Co Ltd | Dewsbury | 2022 |
| A.A.Rosati Ltd | Swindon | 2012 |
| A.A.S. Limited | Newcastle Upon Tyne | 1992 |
| A.A.T Welding Engineers Ltd | Dewsbury | 2022 |
| A.A.W. Limited | Wolverhampton | 1997 |
| A.Advising Limited | London | 2024 |
| A.Aka Limited | London | 2015 |
| A.Anderson & Son(Electrical Engineers)Limited | | 1967 |
| A.B Chohan Ltd | Edinburgh | 2026 |
| A.B MEP Engineering Ltd | Bedford | 2018 |
| A.B Northampton Limited | Selkirk | 2013 |
| A.B. & K Consulting Limited | London | 2011 |
| A.B. (Technical) Limited | Bracknell | 1998 |
| A.B. Cant Limited | Dunfermline | 1964 |
| A.B. Electronic Components Limited | London | 1957 |
| A.B. Insulation Ltd | Glasgow | 2026 |
| A.B. Pappoe Consultancy & Advisory Ltd | London | 2026 |
| A.B. Specialist Hose Supplies Limited | Bellshill | 2002 |
| A.B. Survey & Inspection Limited | Glasgow | 2007 |
| A.B. Surveying & Site Engineering Services Limited | Maidstone | 1997 |
| A.B.A. (International) Limited | Ringwood | 1987 |
| A.B.C. Surveys Limited | Middlesex | 2005 |
| A.B.C. Advertising Partners Limited | Banbury | 1978 |
| A.B.C. Photography Limited | Solihull | 2008 |
| A.B.C. Royalties Consultants Limited | Epsom | 1995 |
| A.B.F. Nominees Limited | London | 1973 |
| A.B.F.Holdings Limited | London | 1936 |
| A.B.Hedges Limited | Telford | 2016 |
| A.B.I. (Premises) Limited | London | 1985 |
| A.B.L. (Fabrications) Limited | | 1919 |
| A.B.M. Limited | Cheshire | 1986 |
| A.B.M. Ventures Ltd | Kent | 2003 |
| A.B.M.Chemicals Limited | Watford | 1931 |
| A.B.P. Associates Limited | Southampton | 2000 |
| A.B.S. Engineering Services Limited | Milford Haven | 2022 |
| A.B.Secretarial Services Limited | Swadlincote | 1959 |
| A.Blake Holdings Ltd | Birmingham | 2025 |
| A.Blundell (Jewel Bearings) Limited | Coventry | 1953 |
| A.Brogden Ltd | Newcastle Upon Tyne | 2023 |
| A.C Management Consulting Limited | Perth | 2004 |
| A.C. PAT Testing Ltd | Melton Mowbray | 2010 |