| A & W GAS Ltd | Liverpool | 2017 |
| A & W M Urquhart Limited | Lothian | 2001 |
| A & Y Law Ltd | London | 2016 |
| A & Z Accounting Services Limited | Nottinghamshire | 2006 |
| A & Z Consultants Limited | London | 2013 |
| A & Z Limited | Batley | 2011 |
| A & Z UK Consultancy Ltd | Cardiff | 2016 |
| A (Squared) Quantity Surveying Services Limited | Walsall | 2017 |
| A + B Bookkeeping Limited | Tiverton | 2010 |
| A + D Studio Limited | Oakham | 2008 |
| A + J Global Designs Limited | Bedford | 2006 |
| A - Connect Accountants Ltd | Leicester | 2016 |
| A - Z Communications Solutions Ltd | Dereham | 2012 |
| A / C Gostcon | Wakefield | 2018 |
| A 1 Closing Buddy Limited | Cambridge | 2026 |
| A 1 Cosmetic Development Ltd | Chichester | 2024 |
| A 1 Tachograph Services Limited | Pontypridd | 2007 |
| A 2 B Bookkeeping Limited | Grantham | 2012 |
| A 2 G Accountants Limited | Harrogate | 2007 |
| A 2 H Services Limited | Brighton | 2007 |
| A 2 Z Accountancy Solutions Limited | London | 2019 |
| A 2 Z Contracts & Consultancy Ltd | Nottingham | 2022 |
| A 3 Associates Limited | London | 2006 |
| A 4 Accounting Services Ltd | London | 2022 |
| A 4 Accounts Limited | Pillowell | 2008 |
| A 6 Assessment Ltd | Guisborough | 2010 |
| A a and T (Mersea) Ltd | Colchester | 2025 |
| A a and T (WM) Ltd | Colchester | 2022 |
| A a Consortium Ltd | Cardiff | 2017 |
| A a Essex Holdings Limited | Maidenhead | 2008 |
| A a Estimating Limited | Hoddesdon | 2023 |
| A a F Accountancy Ltd | Cambridge | 2006 |
| A a Garg & Co Limited | London | 2025 |
| A a GAS (Midlands) Ltd | Birmingham | 2019 |
| A a H Planning Consultants Ltd | Leeds | 2006 |
| A a International Ltd | Aberystwyth | 2005 |
| A a Interpreting Service Ltd | Glasgow | 2021 |
| A a Jamal Tax Consultants Limited | London | 2003 |
| A a L Consultants Limited | Stockport | 2010 |
| A a Law (Lancashire) Ltd | Blackburn | 2009 |
| A a Macfarlane Associates Limited | Dunfermline | 2012 |
| A a Malcolm Limited | Middlesbrough | 2025 |
| A a Property Maintenance Ltd | Glasgow | 2019 |
| A a RON (NW) Ltd | Doncaster | 2023 |
| A a Segura Limited | Stourbridge | 2015 |
| A a Shah Limited | Luton | 2012 |
| A a the Driving School Agency Limited | Basingstoke | 1992 |
| A Accountants Limited | London | 2018 |
| A Accounts Services Ltd | Manchester | 2023 |
| A Adam Consultancy Limited | Preston | 2023 |
| A Adams Supervisory Solutions Limited | Blackpool | 2020 |
| A Advanta Limited | Northampton | 2024 |
| A Ahad & Co Ltd | Accrington | 2015 |
| A Ainsworth Surveyors Ltd | Bolton | 2014 |
| A Ajadi Consulting Ltd | Harlow | 2016 |
| A Akhtar Ltd | Dewsbury | 2021 |
| A Allen & SON Limited | High Peak | 2010 |
| A Analytica Limited | Ilford | 2024 |
| A and a Accounting Ltd. | | 1999 |
| A and a Accounting Services Limited | Kingswood | 2009 |
| A and B Architectural Studio Limited | Ilford | 2023 |
| A and D Fire and Compliance Services Ltd | Gillingham | 2025 |
| A and D Imaging Ltd | Llanelli | 2018 |
| A and F Business Consultancy Ltd | Woodford Green | 2019 |
| A and F Management Consultants Limited | Melton Mowbray | 2011 |
| A and G T Consulting Ltd | Fareham | 2026 |
| A and H Hospitality Advisors Ltd | Waterlooville | 2025 |
| A and I Consultancy Ltd | Uxbridge | 2015 |
| A and I Technology Limited | Eastleigh | 1994 |
| A and J Accountants Limited | Thames Ditton | 2024 |
| A and L PUB Services Ltd | Sheffield | 2023 |
| A and M Holding Group Ltd | London | 2026 |
| A and M Parkinson Ltd | Fixby | 2018 |
| A and M Partners Limited | Barnet | 2012 |
| A and M Pharma Services Limited | Barton-Upon-Humber | 2021 |
| A and W Capital Ltd | London | 2016 |
| A Armstrong Plumbing & Heating Ltd | New Milton | 2014 |
| A Atherton Consulting Ltd | Olney | 2017 |
| A Atkinson Limited | Worcs | 2006 |
| A Azizi Media Ltd | Brighton | 2024 |
| A B & C Limited | London | 2000 |
| A B & C Secretarial Limited | London | 2003 |
| A B (Birmingham) Ltd | Bromsgrove | 2015 |
| A B (Folding) Rollers Limited | Hitchin | 2017 |
| A B a Design Associates Limited | Berkhamsted | 2001 |
| A B a Surveying Limited | Knaphill | 2003 |
| A B Accountancy Services Limited | Ardrossan | 2015 |
| A B and C Surveyors Ltd | Bristol | 2016 |
| A B Architectural Design Limited | Frome | 2006 |
| A B Associates (GB) Limited | London | 2008 |
| A B Associates Limited | Scalloway | 1994 |
| A B C D E F G H U M a N Ltd | Huntingdon | 2019 |
| A B C Health & Safety Limited | Canterbury | 2003 |
| A B Chamberlain Ltd | London | 2015 |
| A B Coaches (Holdings) Limited | Torquay | 2010 |
| A B Compliance Services Ltd | Trowbridge | 2018 |
| A B Consulting Engineers Limited | Cambridge | 2018 |
| A B Corporate Services Limited | Hythe | 2022 |
| A B Creative Group Ltd | Coventry | 2026 |
| A B Creative Products Ltd | Stockport | 2024 |