| A.J.G Security Ltd | Aldershot | 2022 |
| A.J.H Meter Reading Services Ltd | Eastbourne | 2015 |
| A.J.Harris Trading Ltd | Dudley | 2025 |
| A.J.J.H. Limited | London | 2006 |
| A.J.M Groundwork (NW) Ltd | Preston | 2025 |
| A.J.M. Enclosing Limited | Melksham | 2004 |
| A.J.N Electrical Services Ltd | Hull | 2019 |
| A.J.P. Safety Limited | London | 2003 |
| A.J.Placement Consultants Private Limited | London | 2023 |
| A.J.R. (Nottingham) Limited | Nottingham | 1999 |
| A.J.S.V Industrial Services Ltd | Manchester | 2025 |
| A.J.T. Plant Hire Limited | Enfield | 2011 |
| A.J.T. Services (Scotland) Ltd | Buckie | 2012 |
| A.Jacob Ltd | Birmingham | 2021 |
| A.Juniper Change Professional Limited | Leeds | 2016 |
| A.K. Bray for Gardens Limited | Broadstairs | 2002 |
| A.K. Rides Limited | Kingswinford | 2014 |
| A.K. Roberts Paving Specialist Limited | Wallasey | 2008 |
| A.K.A Productive Solutions Ltd | Ilford | 2013 |
| A.K.A. Property Investments Limited | Bradford | 2012 |
| A.K.D. Systems Limited | Edinburgh | 1988 |
| A.K.Z Security Ltd | Northampton | 2014 |
| A.Kainth Holdings Limited | London | 2018 |
| A.Kind Gardener Ltd | Wetherby | 2023 |
| A.L Detailing & Maintenance Ltd | Leigh-On-Sea | 2024 |
| A.L Healthcare Limited | London | 2014 |
| A.L Projects Ltd | London | 2023 |
| A.L Security SW Ltd | Mildenhall | 2023 |
| A.L Valeting Ltd | Widnes | 2023 |
| A.L.D. Design & Display Limited | Walthamstow | 2007 |
| A.L.E. Building & Landscaping Ltd | Bristol | 2018 |
| A.L.E. Business Machines Limited | Kent | 2000 |
| A.L.F Business Solutions Limited | Liverpool | 2021 |
| A.L.L. Recruitment Limited | West Yorkshire | 1996 |
| A.L.M Groundworks & Paving Ltd. | Bridlington | 2016 |
| A.L.R. Agencies Limited | Strathaven | 2014 |
| A.L.S. Landscaping & Fencing Limited | Honiton | 2011 |
| A.L.T. Consultancy Limited | Hitchin | 2024 |
| A.M Autogroup Ltd | Mansfield | 2025 |
| A.M Commercial Cleaning Limited | Bradford | 2017 |
| A.M Skips Limited | Wirral | 2015 |
| A.M Sports (Midlands) Ltd | Derby | 2023 |
| A.M. Best Europe - Rating Services Limited | London | 1991 |
| A.M. Forktrucks Limited | Rayleigh | 1998 |
| A.M. Global Visa & Hospitality Limited | Southsea | 2021 |
| A.M. Landscapeplus Ltd | Banchory | 2023 |
| A.M. Noon Limited | Dorking | 2017 |
| A.M. Security Limited | London | 1997 |
| A.M. Simons Limited | South Chard | 1997 |
| A.M. Strategy Limited | | 2006 |
| A.M. Supportive Care Ltd | Hereford | 2022 |
| A.M. UK Security Limited | Swaffham | 2010 |
| A.M.A.R Electrical Ltd | London | 2008 |
| A.M.B.Piramida Ltd | Doncaster | 2025 |
| A.M.E Electrical Limited | Merthyr Tydfil | 2016 |
| A.M.F. Developments Limited | Norwich | 2002 |
| A.M.I. Renewables Ltd | Hull | 2019 |
| A.M.J Kennedy E,I&C Ltd | Glasgow | 2026 |
| A.M.K.(Service)Agency Limited | London | 1967 |
| A.M.M. Carpentry Ltd | Harrow | 2017 |
| A.M.P Live Limited | Stoke-On-Trent | 2026 |
| A.M.P. Events Limited | Retford | 2013 |
| A.M.P. Foods Limited | Castleford | 1995 |
| A.M.P. Security (Lincs) Ltd | Lincoln | 2014 |
| A.M.T Clear View Windows Ltd | Crediton | 2021 |
| A.Mackinnon Ltd | Fort William | 2012 |
| A.Matts & SON Limited | Warwickshire | 1937 |
| A.Mclay and Company Limited | Cardiff | 1902 |
| A.N Lifestyle Limited | Luton | 2021 |
| A.N. Sanderson & Co. (Landscape Gardeners) Limited | Sunderland | 1961 |
| A.N.H Security Ltd | Bath | 2021 |
| A.N.L Consultancy Ltd | London | 2013 |
| A.N.S Advice Ltd | London | 2022 |
| A.N.T Security Fencing Ltd | Surrey | 2025 |
| A.N.T. Estates Limited | Cardiff | 2014 |
| A.N.Zee Limited | Durham | 2019 |
| A.Nplant Ltd | Abbey Wood | 2016 |
| A.O Landscaping Ltd | Caerphilly | 2020 |
| A.O. Cleaning & Estate Limited | London | 2026 |
| A.O.A Compliance Consulting Limited | Wembley | 2014 |
| A.O.J. Autos Limited | London | 2022 |
| A.Okoye Limited | Derby | 2019 |
| A.P Patrick Group Ltd | Peterborough | 2024 |
| A.P. Building Services Ltd | Manchester | 2025 |
| A.P. Gilfoyle U.K. Ltd. | London | 2025 |
| A.P. Newall & Company Limited | Edinburgh | 1917 |
| A.P. Procurement Services Limited | Warrington | 2009 |
| A.P. Production Services Limited | Solihull | 2002 |
| A.P. Wakeham Hire Limited | South Brent | 1993 |
| A.P. Window Cleaning Limited | Egham | 2022 |
| A.P.C. Garden Services Ltd | Carterton | 2021 |
| A.P.D Security Solutions Limited | Torquay | 2023 |
| A.P.E. Investments Limited | Spalding | 2015 |
| A.P.E. Planet Ltd | Surbiton | 2026 |
| A.P.E. Ship Ltd | Bedworth | 2025 |
| A.P.F. Gears Limited | Liverpool | 2011 |
| A.P.P.M Contracts Ltd | Coalville | 1997 |
| A.P.Properties (Cardiff) Limited | Cardiff | 1972 |
| A.P.R. Entertainment Limited | Hove | 2020 |
| A.P.T. Training & Consultancy Limited | Leicester | 2006 |