| A.M Consulting & Help Ltd | Oxford | 2025 |
| A.M Design Studio Limited | Cardiff | 2025 |
| A.M Direct Consulting Limited | Worthing | 2017 |
| A.M Skills Ltd | London | 2021 |
| A.M. Accountants Limited | London | 2001 |
| A.M. Adams Holdings Limited | Barnstaple | 1989 |
| A.M. Associates Accy Ltd | Kenilworth | 2002 |
| A.M. Bracchi Limited | Leeds | 2004 |
| A.M. Castle Metals UK, Limited | Manchester | 2007 |
| A.M. Design Consultancy (London) Limited | London | 2013 |
| A.M. Enforcement Ltd | Uxbridge | 2018 |
| A.M. Engineering (Scotland) Limited | Alford | 2015 |
| A.M. Established Company Limited | Corby | 2018 |
| A.M. Health & Safety Limited | Swindon | 1997 |
| A.M. Innovation Limited | Cookstown | 2018 |
| A.M. International Limited | Romford | 1998 |
| A.M. Miles Limited | Fairford | 2002 |
| A.M. Moss Ltd | Co Antrim | 2003 |
| A.M. Norris (Holdings) Limited | Coalville | 2012 |
| A.M. Production Services Ltd | Deby | 2025 |
| A.M. Robinson Limited | Essex | 2006 |
| A.M. Sewell & Co. Limited | Basildon | 2000 |
| A.M. Tree Survey Specialist Ltd | Cupar | 2023 |
| A.M.1. Consulting Limited | Doncaster | 2020 |
| A.M.A. Austin Investments Limited | Leigh-On-Sea | 1987 |
| A.M.C. Services (UK) Limited | London | 2014 |
| A.M.D.R. Limited | Sutton | 1996 |
| A.M.E. Consultants Limited | St. Agnes | 1997 |
| A.M.E. Outsource Specialists 1 Limited | Cardiff | 2025 |
| A.M.E. Outsource Specialists 2 Limited | Cardiff | 2025 |
| A.M.E. Outsource Specialists 3 Limited | Cardiff | 2025 |
| A.M.E. Outsource Specialists 4 Limited | Cardiff | 2025 |
| A.M.E. Outsource Specialists 5 Limited | Cardiff | 2025 |
| A.M.E. Outsource Specialists 6 Limited | Cardiff | 2025 |
| A.M.E. Outsource Specialists Limited | Cardiff | 2025 |
| A.M.G. Business & Commercial Finance Consultants Limited | Bishop Auckland | 2020 |
| A.M.Housley Design Ltd | Derby | 2018 |
| A.M.L. Engineers (Teesside) Limited | Estate Marske By Sea Redcar | 1971 |
| A.M.Meri Architects Limited | Harrow | 2012 |
| A.M.P. Interiors Limited | Guildford | 2009 |
| A.M.P.M Accounting Services Ltd | Wallington | 2020 |
| A.M.S. Biotechnology (Europe) Limited | Cambridge | 1987 |
| A.M.S. Europe Limited | London | 2014 |
| A.M.S. Investments Limited | London | 1959 |
| A.M.T Automotive Ltd | Bideford | 2026 |
| A.M.Tech FZC UK Ltd | Tamworth | 2021 |
| A.Maan Architectural Services Limited | Berkshire | 2003 |
| A.Maddock & SON Limited | Liverpool | 1963 |
| A.Murphy Construction Services Ltd | Manchester | 2023 |
| A.N & Co Accountants Ltd | Rochdale | 2014 |
| A.N.B. Associates Limited | Aldershot | 1990 |
| A.N.C. Training and Development Limited | Redditch | 2001 |
| A.N.D. (Liverpool) Ltd | Liverpool | 2020 |
| A.N.D. Employee Ownership Trustee Limited | Neath | 2026 |
| A.N.D. Energy Limited | Birmingham | 2010 |
| A.N.E Consult Ltd | St. Albans | 2013 |
| A.N.Group Limited | Harrogate | 2015 |
| A.N.K Communications Ltd | London | 2019 |
| A.N.S Consultancy Limited | Luton | 2024 |
| A.N.T Services Ltd | Beckenham | 2026 |
| A.N.V. Inspection Ltd | St. Asaph | 2024 |
| A.N.Y. Accounting and Bookkeeping Services Ltd | Chorley | 2019 |
| A.N.Y.A Consulting Limited | Romford | 2019 |
| A.Neophytou & Co Ltd | Barnet | 2015 |
| A.O Electrical Design Consultants Limited | Norwich | 2012 |
| A.O Engineering Ltd | Wakefield | 2024 |
| A.O. George Consultancy Services Ltd | London | 2015 |
| A.O. Marketing Limited | Worcester | 2011 |
| A.O. Services | London | 1959 |
| A.Ove Services Limited | Shrewsbury | 2023 |
| A.P Industrialfinance Ltd | London | 2012 |
| A.P Mobile Ltd | Wrecsam | 2025 |
| A.P Tech Services Ltd | Wickford | 2026 |
| A.P Vincent Partners Ltd | Bristol | 2024 |
| A.P. Baker & Co. Limited | Cardiff | 2014 |
| A.P. Berkeley Ltd | Mayfair | 2014 |
| A.P. Consulting Solutions Ltd | Romford | 2025 |
| A.P. Faulkner (Plumbing) Limited | Reading | 1981 |
| A.P. Faulkner Limited | Reading | 2014 |
| A.P. Freeman Group Limited | Wisbech | 2017 |
| A.P. Heptonstall Limited | Warrington | 1980 |
| A.P. Owen Limited | Aldridge | 1966 |
| A.P. Planning & Logistics Limited | Callington | 2003 |
| A.P. Robinson & Co. Limited | Grimsby | 1997 |
| A.P. Shipping (Freight Services) Ltd | Hull | 1997 |
| A.P. Tech & Mgmt Ltd | London | 2025 |
| A.P. VET Limited | Hereford | 2013 |
| A.P. Xpress Limited | 94A Wycliffe Road | 1991 |
| A.P.A.C. Limited | Monmouth | 2004 |
| A.P.C Management Solutions Limited | Nuneaton | 2017 |
| A.P.C. (Pathology) Limited | Boverton | 2009 |
| A.P.C. Developments Limited | Kingston Upon Thames | 1998 |
| A.P.D. Alarms Limited | Droitwich | 2019 |
| A.P.D.A. London Limited | Ilford | 2007 |
| A.P.H. (Engineering) Limited | Peterborough | 1987 |
| A.P.H. (Hire) Limited | Peterborough | 1987 |
| A.P.H. (Holdings) Limited | Lynch Wood | 2003 |
| A.P.H. Farm Services Limited | Peterborough | 1991 |
| A.P.L. Architecture and Design Limited | Manchester | 2012 |
| A.P.L. Design Limited | Lowestoft | 1990 |