| A-Z Building Work Ltd | London | 2025 |
| A-Z Business Consultancy Ltd | London | 2019 |
| A-Z Certified Accountants Limited | Birmingham | 2011 |
| A-Z Community Consulting Ltd | Peterborough | 2023 |
| A-Z Engineering Services and Spares Ltd | King'S Lynn | 2023 |
| A-Z Finance Limited | Manchester | 2016 |
| A-Z Law Solicitors Limited | London | 2005 |
| A-Z Legal Solutions Ltd | London | 2024 |
| A-Z Media Marketing Ltd | Glasgow | 2026 |
| A-Z Medical Writing Limited | London | 2008 |
| A-Z Mortgages & Protection Ltd | Nottingham | 2021 |
| A-Z PPC Limited | London | 2012 |
| A-Z Project Services Limited | Bury St. Edmunds | 2003 |
| A-Z Rack Inspections Ltd | Mold | 2020 |
| A-Z Renovation Bvba Limited | Hythe | 2019 |
| A-Z Spectrum Ltd | London | 2024 |
| A-Z Synergy Ltd | London | 2023 |
| A-Z Tax Accountants Ltd | London | 2021 |
| A-Z Translation & Interpreting Services Ltd | Bromley | 2002 |
| A-Z Travel Ltd | London | 2026 |
| A-Z Z-A Companies Limited | London | 2014 |
| A-Z Z-A COMPANIES1 Limited | London | 2022 |
| A-Zan Consultancy Ltd | Oxford | 2007 |
| A. & C. Associates Limited | Durham | 2009 |
| A. & I. Woodhouse Limited | Elland | 1979 |
| A. & J. Wholesale Limited | | 1983 |
| A. & M. (UK) Limited | Leeds | 1999 |
| A. & P. Steven Limited | Glasgow | 1922 |
| A. 1. Profiling Limited | Cambridgeshire | 1986 |
| A. a. Holmes Limited | Broadway | 2016 |
| A. Ahmed & Co (Acctt) Ltd | London | 2010 |
| A. and S. Circuits Limited | Norwich | 1992 |
| A. Andrews Trustee Limited | | 1999 |
| A. B Howells Limited | Uckfield | 2014 |
| A. B. Accountancy Services (HT) Limited | Oldham | 2023 |
| A. B. Coultate Consulting Limited | Harrow | 2015 |
| A. B. Davies Consultancy and Design Limited | Thame | 2019 |
| A. B. International Ventures Limited | London | 1973 |
| A. B. S. Cleaning Services Limited | | 1995 |
| A. B. Technology (Newark) Limited | Nottinghamshire | 1994 |
| A. Bashir & Co Limited | Birmingham | 2006 |
| A. Bergen Consulting Limited | Wimborne | 2020 |
| A. Berridge & Company Limited | Cardiff | 1997 |
| A. Bryden and Co. Limited | Windsor | 1980 |
| A. Bureau (2021) Ltd | Stanley | 2021 |
| A. Burrows Consultancy Ltd | Billericay | 2024 |
| A. Buxton (Group) Limited | Bicester | 1995 |
| A. C. Bamford Limited | Staffordshire | 2004 |
| A. C. Environmental Holdings Limited | Ashwellthorpe | 2008 |
| A. C. Environmental Services (UK) Limited | Ashwellthorpe | 2008 |
| A. C. Gwatkin Ltd | Verwood | 2018 |
| A. C. Miller Consultancy Limited | Walton-On-Thames | 2007 |
| A. Chalmers Ltd | Dereham | 2026 |
| A. Comley Limited | Elgin | 2007 |
| A. Conway & Co Ltd | N. Ireland | 2003 |
| A. Create Limited | London | 2011 |
| A. D. Architectural Design Limited | London | 2005 |
| A. D. B. Locksmith Services Limited | Warrington | 2002 |
| A. D. Design Concepts Limited | London | 2008 |
| A. Dervish & Co Limited | Smethwick | 2003 |
| A. Dunn Design Limited | North Shields | 2019 |
| A. Ellwood Limited | Croydon | 1932 |
| A. Emerson Consultancy Ltd | Lutterworth | 2018 |
| A. Evans and Sons (Haulage) Limited | Oswestry | 1994 |
| A. Evans Limited | Birmingham | 2011 |
| A. F. Hunt (Builders) Holdings Limited | Nottingham | 2004 |
| A. Farquhar (Builders) Limited | Blantyre | 1959 |
| A. Ferraris Limited | Porthcawl | 2008 |
| A. FOX Accountants for Business Limited | Sutton Coldfield | 2005 |
| A. FOX Engineering Limited | Wilmslow | 2007 |
| A. G. Clarke Limited | Seaton | 2002 |
| A. Gandhi Ltd | Kenilworth | 2023 |
| A. Greis Design Ltd. | Worcester Park | 2012 |
| A. Groom Engineering Ltd | Redditch | 2006 |
| A. Gunn Professional Consultancy Limited | Leven | 2014 |
| A. H. Jones Limited | Taffs Well | 2003 |
| A. H. Warren Trust (Holdings) Limited | Somerset | 1954 |
| A. Hall Consultancy Limited | Newcastle Upon Tyne | 2025 |
| A. Haniel Ltd | West Kirby | 2005 |
| A. Hanson-Fraser Limited | Altrincham | 2019 |
| A. Hartigan DO Services Limited | Bolton | 2026 |
| A. Hastings Ltd | Southend-On-Sea | 2019 |
| A. Hound Associates Ltd | London | 2019 |
| A. Infantino & Co. Accountants Limited | Hoddesdon | 2018 |
| A. Irwin Accountancy Ltd | Larkhall | 2023 |
| A. J. Asset Holdings Limited | Blackwood | 2012 |
| A. J. Fraser Engineering Ltd | Towcester | 2014 |
| A. J. Harrison (Accountants) Limited | Barnsley | 2009 |
| A. J. Johnstone & Co. Limited | Glasgow | 1985 |
| A. J. Nestorow Design & Surveying Services Limited | Powys | 2003 |
| A. J. Photographics Limited | Greenford | 2017 |
| A. J. Ryder & Co Ltd | Manchester | 2003 |
| A. Jones & Co Ltd | Hornchurch | 2011 |
| A. K. Tax Consultant Limited | Avon | 2003 |
| A. Kalam's - PMO Services Limited | Hayes | 2018 |
| A. Karoly Limited | London | 2013 |
| A. Kouts & Co Limited | | 2003 |
| A. L. Williams Limited | Staffordshire | 2006 |
| A. Lalji Ltd | Waltham Abbey | 2016 |
| A. Lord Consulting Limited | Doncaster | 2008 |