| A.E. Culley (Architectural Services) Limited | Lincolnshire | 2003 |
| A.E. Ford Electrical Services Limited | Chatham | 2007 |
| A.E. Jones Fabrication and Welding Engineers Limited | Halifax | 2024 |
| A.E. Robb & Associates Limited | Newcastle Upon Tyne | 1977 |
| A.E. Rodda & SON Group Ltd | Redruth | 2012 |
| A.E. Smith, Coggins (Holdings) Limited | Sandycroft,Deeside | 1923 |
| A.E. Vehicle Services Limited | Bewdley | 2006 |
| A.E.C. Partnership Limited | Loughborough | 1984 |
| A.E.Chesswas & SON Limited | Elland | 1953 |
| A.E.Coe & Sons, Limited | Braintree | 1996 |
| A.E.E. Ltd. | Walsall | 1991 |
| A.E.G Management Limited | Stanley | 2024 |
| A.E.Group Machines Limited | Manchester | 1954 |
| A.E.M. (Carbon Products) Limited | Halesowen | 1983 |
| A.E.M. Enterprises Limited | Eastbourne | 1979 |
| A.E.Piggott & Sons,Limited | Nr. Stratford-Upon-Avon | 1946 |
| A.E.S Engineering Employee Trust Limited | Mill Close Rotherham | 2000 |
| A.E.Smith,Coggins Limited | Sandycroft, Deeside | 1924 |
| A.E.T. Engineering Consultancy Company Limited | Newcastle Under Lyme | 2013 |
| A.E.T. Freso Limited | Bristol | 2006 |
| A.Edwards Consulting Ltd | London | 2023 |
| A.F. Dillion Limited | Altrincham | 2022 |
| A.F. Lifeskills Ltd | London | 2023 |
| A.F. Scotland Limited | Annan | 1990 |
| A.F. Technical Services Limited | Nottingham | 1997 |
| A.F.A. Planning (Agriculture) Limited | St. Neots | 2012 |
| A.F.Johnson Consulting Limited | Ilkley | 2003 |
| A.F.Parker Consulting Ltd | London | 2024 |
| A.F.T. Holdings Limited | Hitchin | 2006 |
| A.Foster Consulting Ltd | Leeds | 2026 |
| A.Frank Group Limited | Belfast | 2024 |
| A.Fryer & Sons Limited | Cardiff | 1946 |
| A.G Engineering Consultants Ltd | Cheadle | 2018 |
| A.G. Accounting Limited | Aberdeen | 2002 |
| A.G. Berger Limited | London | 2024 |
| A.G. Consultants Ltd | Hoddesdon | 2017 |
| A.G. Evans Holdings Limited | Tring | 1998 |
| A.G. Faulkner Consultants Ltd | Cirencester | 2019 |
| A.G. Jarvis Limited | Worcestershire | 2015 |
| A.G. Registrars Limited | London | 1988 |
| A.G.A Accounting Solutions Ltd | Hinckley | 2025 |
| A.G.A Tax Services Ltd | Orpington | 2021 |
| A.G.B Industrial Ltd | Irvine | 2013 |
| A.G.Bicknell & Co Ltd | Liphook | 2011 |
| A.G.E Environmental Ltd | Guildford | 2022 |
| A.G.G. Solutions Ltd | Shepperton | 2011 |
| A.G.Integrity Services Ltd | Aberdeen | 2018 |
| A.G.L. Accountancy Services Ltd | Harrogate | 2003 |
| A.G.Mc Ltd | London | 2022 |
| A.G.Mercer Ltd | Taunton | 2007 |
| A.G.P. Property Management Company Limited | Manchester | 1982 |
| A.G.S Property Ltd | Taunton | 2012 |
| A.G.S. Transport Consultancy Limited | Dorchester | 2010 |
| A.Gakou Ltd | Cardiff | 2019 |
| A.Grant Consultancy Limited | Leeds | 2016 |
| A.H Accountancy Ltd | London | 2014 |
| A.H for Engineering Consultations Ltd | Harrogate | 2013 |
| A.H Interiors (Southwest) Ltd | Weston-Super-Mare | 2023 |
| A.H. Consultancy (U.K.) Ltd | North Walsham | 2024 |
| A.H. Homes Global Ltd | London | 2025 |
| A.H. Knight Asia Laboratory Ltd. | Prescot | 1996 |
| A.H. Knight Asia Ltd. | Prescot | 1996 |
| A.H. Leach & Company Limited | Huddersfield | 1999 |
| A.H. North London Limited | London | 2000 |
| A.H. O'Neill Language Services Limited | North Yorkshire | 2003 |
| A.H. Page | Ilford | 2008 |
| A.H. Procurement & Supply Chain Ltd | Harlow | 2013 |
| A.H. Worth (Farms) | Spalding | 1954 |
| A.H.Adams & Sons Limited | Birmingham | 1952 |
| A.H.Bowerman and SON Limited | Pulborough | 1959 |
| A.H.Field(Overseas Investments)Limited | Birmingham | 1969 |
| A.H.J Consultants Ltd | Walsall | 2023 |
| A.H.Tree Ltd | Preston | 2023 |
| A.Halls Inspection Ltd | Nairn | 2023 |
| A.Hay Consultancy Limited | Evesham | 2020 |
| A.I. Accountancy Services Ltd | Dukinfield | 2023 |
| A.I. Accountants (NW) Ltd | Dukinfield | 2026 |
| A.I. Accounting and Taxation Ltd | Dukinfield | 2023 |
| A.I. Accounting Ltd | Dukinfield | 2023 |
| A.I. Business Consulting (NW) Limited | Dukinfield | 2026 |
| A.I. Cherry Limited | Lancashire | 1993 |
| A.I. Cohen & Associates Limited | Essex | 2002 |
| A.I. Consultancy Services Ltd | Dukinfield | 2023 |
| A.I. Giurgea Limited | London | 2019 |
| A.I. Graphic Design Ltd | Dukinfield | 2023 |
| A.I. Lite Ltd | Warrington | 2023 |
| A.I. Management Peterborough Ltd | Kingswinford | 2018 |
| A.I. PR Ltd | London | 2011 |
| A.I. Tax Consulting Ltd | London | 2024 |
| A.I. Taxation Ltd | Dukinfield | 2023 |
| A.I. Taxation Services Ltd | Dukinfield | 2023 |
| A.I. to Sell Your Business Ltd | Dukinfield | 2023 |
| A.I.A Consulting Ltd | London | 2014 |
| A.I.A. Installations Limited | Staffordshire | 1997 |
| A.I.Accountax Ltd | London | 2011 |
| A.I.B.Trustees Limited | London | 1963 |
| A.I.D Consultancy Limited | London | 2009 |
| A.I.D Investments Ltd | Leamington Spa | 2011 |
| A.I.E Dynamic Ltd | Harlow | 2024 |
| A.I.M. Accountant Limited | Little Gomersal | 2020 |