| A.P.M. Holdings Limited | Sittingbourne | 2005 |
| A.P.R. Secretaries Limited | North East Lincolnshire | 1999 |
| A.P.S Interim Ltd | Bedford | 2019 |
| A.P.S Welding & Fabrication Services Limited | Romsey | 2010 |
| A.P.S. Limited | Sunbury On Thames | 1979 |
| A.P.S. Secretaries Limited | Kent | 1993 |
| A.P.T. Capital Limited | London, | 2015 |
| A.Peal Limited | Southend-On-Sea | 2018 |
| A.Profili Consulting Ltd | Alva | 2026 |
| A.Q. Accountants (M/C) Limited | Manchester | 2010 |
| A.Q.B. Architectural Workshop Limited | | 2003 |
| A.Q.C. Limited | Hollinwood | 1995 |
| A.R & Co International Ltd | Wembley | 2026 |
| A.R Business Consultancy Limited | Kettering | 2004 |
| A.R Coaching Academy Ltd | Leighton Buzzard | 2024 |
| A.R. Aviation Limited | Bournemouth | 2011 |
| A.R. Consultants (UK) Limited | Bradford | 1998 |
| A.R. Equine Ltd | Chesham | 2021 |
| A.R. Financial Consulting Limited | Sutton | 2020 |
| A.R. Houghton Limited | Wolverhampton | 2001 |
| A.R. Marine Engineering Limited | Newry | 2012 |
| A.R. Materials Handling Limited | Rossendale | 2004 |
| A.R. Property Consultancy Ltd | Plymouth | 2013 |
| A.R. Property Designs Ltd | Chelmsford | 2017 |
| A.R. Suleman Ltd | Birmingham | 2004 |
| A.R. Thompson & Associates Flat Management Limited | Croydon | 1991 |
| A.R.A Mortgage Services Ltd | London | 2020 |
| A.R.Ansari's Consultants Limited | Rotherham | 2025 |
| A.R.B. Holdings Limited | Birmingham | 1982 |
| A.R.Brown,Mcfarlane & Company, Limited | Eurocentral | 1930 |
| A.R.C Social Ltd | Bradford | 2024 |
| A.R.C.(Western)Limited | Maidenhead | 1967 |
| A.R.Dellow Limited | Basildon | 2012 |
| A.R.E Bespoke Ltd | Bexley | 2019 |
| A.R.F Advisory Ltd | Edgware | 2025 |
| A.R.G Capital Ltd | Leatherhead | 2021 |
| A.R.Global Consultancy Limited | Corby | 2024 |
| A.R.H. Group Holdings Ltd | London | 2023 |
| A.R.H. Holdings 1 Limited | London | 2026 |
| A.R.H. Holdings Ltd | London | 2023 |
| A.R.I. Surveying Ltd | Aylesford | 2022 |
| A.R.K. Business Consultants Limited | Colchester | 2019 |
| A.R.M Robotics Ltd | Birmingham | 2014 |
| A.R.M. Heritage Railway Services LES Ltd | Port Talbot | 2024 |
| A.R.M. Machinery Limited | Keighley | 2007 |
| A.R.M.Project Services Ltd | Clitheroe | 2015 |
| A.R.N. Holdings Ltd. | London | 2024 |
| A.R.S. Associates Ltd | Manchester | 2012 |
| A.R.T. Business Consulting Limited | York | 2001 |
| A.R.T. Consultancy Limited | Hythe | 2000 |
| A.R.T. PR Ltd | London | 2017 |
| A.R.Taylor Limited | Nuneaton | 2006 |
| A.Ramsay Consulting Limited | Bideford | 2025 |
| A.Ro Distribution Import Export Ltd | Dover | 2024 |
| A.Roberts Ltd | Mold | 2016 |
| A.Roe Pharma Consulting Limited | Teddington | 2019 |
| A.Row Consulting Limited | London | 2021 |
| A.S Anderson and SON Electrical Contractors Limited | Brighton | 2013 |
| A.S Associates (Scot) Ltd | Newburgh | 2022 |
| A.S Construction & Engineering Ltd | London | 2016 |
| A.S Consulting Services Limited | Warrington | 2024 |
| A.S Legal Services Ltd | Leicester | 2023 |
| A.S Management & Consultancy Ltd | Slough | 2021 |
| A.S Mosley & Company Limited | Insch | 1997 |
| A.S Translations Limited | Borehamwood | 2019 |
| A.S. - C&C Solutions Limited | London | 2017 |
| A.S. Architecture Ltd | Ashford | 2025 |
| A.S. Baynard Ltd | Manchester | 2014 |
| A.S. BIZ Empire Ltd | Oxted | 2009 |
| A.S. Brill & Co Limited | London | 2021 |
| A.S. Brooklands Limited | Congleton | 2008 |
| A.S. Clark Limited | Worcester | 1953 |
| A.S. Engineering (Derby) Ltd. Ltd | Derby | 2019 |
| A.S. Folbigg Limited | St Neots | 2007 |
| A.S. Greenstreet Limited | Essex | 2003 |
| A.S. Handover Trustees Limited | London | 2022 |
| A.S. Holdings (UK) Limited | London | 1981 |
| A.S. Howes & Co Limited | Aylesbury | 2001 |
| A.S. Matthews Limited | Manchester | 2011 |
| A.S. Procurement Ltd | Rickmansworth | 2024 |
| A.S. Renewable Energy Advisory Ltd | Penarth | 2021 |
| A.S. Studio Limited | London | 2006 |
| A.S. Thomas & Co Limited | Tamworth | 2005 |
| A.S. Trade International Limited | London-Stansted | 2020 |
| A.S. Tuition Limited | London | 2024 |
| A.S. Windfarm Services Limited | Middlesbrough | 2011 |
| A.S.A. (UK) Limited | London | 1991 |
| A.S.A.P Accounting Services Ltd | Colchester | 2004 |
| A.S.A.P Accounting Solution Limited | London | 2020 |
| A.S.A.P. Sign Services Limited | | 1990 |
| A.S.B. Nominees Limited | London | 1970 |
| A.S.B. Software Limited | Rugby | 1987 |
| A.S.D Accounting Services Limited | Worthing | 2003 |
| A.S.Enterprises Limited | Lambourn | 1991 |
| A.S.H Air Conditioning Solutions Ltd. | Dunstable | 2022 |
| A.S.H. & S. Vickers Limited | London | 2014 |
| A.S.H. Business Growth Ltd | Dronfield | 2021 |
| A.S.Harrison Electrical Ltd | Liverpool | 2023 |
| A.S.K Legal Solutions Ltd | Shipley | 2016 |
| A.S.K Process Consultants Limited | Lancashire | 2003 |