| A.L.S Sorting Ltd | Transport & logistics | 2024 |
| A.L.S. Hotels Limited | Hospitality | 2011 |
| A.L.T. Heating Ltd | Construction | 2020 |
| A.Leader Ltd. | Health & social care | 2024 |
| A.Lloyd and Sons Limited | Construction | 1916 |
| A.Lungarini Ltd | Professional & scientific | 2026 |
| A.M Analytics Ltd | Information & communication | 2024 |
| A.M Electrical Solutions LDN Limited | Construction | 2025 |
| A.M for Real Estate Ltd | Real estate | 2019 |
| A.M Master Ltd | Wholesale & retail | 2025 |
| A.M Medical Group Limited | Health & social care | 2025 |
| A.M Motors Limited | Wholesale & retail | 2012 |
| A.M Pipe Solutions Limited | Construction | 2020 |
| A.M Produktions Ltd | Information & communication | 2025 |
| A.M Property Services (London) Ltd | Construction | 2021 |
| A.M Residence Ltd | Real estate | 2022 |
| A.M Skills Ltd | Professional & scientific | 2021 |
| A.M Sparks Ltd | Construction | 2016 |
| A.M Tailoring Ltd | Wholesale & retail | 2022 |
| A.M Trading &Services Ltd | Hospitality | 2018 |
| A.M Visual Productions Ltd | Information & communication | 2025 |
| A.M. & Sons (UK) Ltd | Transport & logistics | 2009 |
| A.M. Accountants Limited | Professional & scientific | 2001 |
| A.M. Azzopardi Limited | Real estate | 2018 |
| A.M. Barella Limited | Hospitality | 2014 |
| A.M. Best Europe - Information Services Limited | Information & communication | 2010 |
| A.M. Best Europe - Rating Services Limited | Administrative & support | 1991 |
| A.M. Buildright Limited | Construction | 2007 |
| A.M. Design Consultancy (London) Limited | Professional & scientific | 2013 |
| A.M. Glazing (Contractors) Limited | Construction | 1982 |
| A.M. Health Collective Ltd | Health & social care | 2026 |
| A.M. Hope Investment Limited | Real estate | 2022 |
| A.M. Hope Limited | Real estate | 2018 |
| A.M. Nomikos & SON (UK) Limited | Transport & logistics | 1981 |
| A.M. Pugh Limited | Construction | 1997 |
| A.M. Security Limited | Administrative & support | 1997 |
| A.M. Sonography Ltd | Health & social care | 2023 |
| A.M. Transp Ltd | Construction | 2025 |
| A.M.A Carpentry and Joinery Ltd | Construction | 2016 |
| A.M.A.R Electrical Ltd | Administrative & support | 2008 |
| A.M.B. Properties (UK) Limited | Wholesale & retail | 2008 |
| A.M.B. Properties Limited | Real estate | 1976 |
| A.M.C. Properties and Investments Limited | Real estate | 2018 |
| A.M.C. Services (UK) Limited | Professional & scientific | 2014 |
| A.M.E Medical Ltd | Health & social care | 2020 |
| A.M.H Construction Development. Ltd | Construction | 2024 |
| A.M.I. Investments Limited | Real estate | 1959 |
| A.M.Innovative Strivers Ltd | Hospitality | 2024 |
| A.M.K.(Service)Agency Limited | Administrative & support | 1967 |
| A.M.L.E IT Consultancy Ltd | Information & communication | 2023 |
| A.M.M Properties Ltd | Real estate | 2013 |
| A.M.M Security Service Ltd | Real estate | 2020 |
| A.M.Natures Limited | Wholesale & retail | 2023 |
| A.M.P Associates LLP | | 2013 |
| A.M.R Unitrade Ltd | Wholesale & retail | 2025 |
| A.M.R Waste Removals Limited | Water & waste | 2022 |
| A.M.R. Heating Limited | Manufacturing | 2002 |
| A.M.S Projects Limited | Real estate | 2018 |
| A.M.S. Europe Limited | Professional & scientific | 2014 |
| A.M.S. Imports Exports Limited | Extraterritorial | 1996 |
| A.M.S. Investments Limited | Professional & scientific | 1959 |
| A.M.S. Trading Services Limited | | 1986 |
| A.M.Wandsworth Limited | Hospitality | 2012 |
| A.Macs Electricals Ltd | Construction | 2019 |
| A.Maple Ltd | Wholesale & retail | 2022 |
| A.Martin Bunzl Limited | Wholesale & retail | 1970 |
| A.Matharu Limited | Real estate | 2017 |
| A.Mcqukservices Ltd | Construction | 2026 |
| A.Mesa Ltd | Hospitality | 2024 |
| A.Metkola Brickwork Ltd | Construction | 2018 |
| A.Mina Management Ltd | Hospitality | 2021 |
| A.Mohameditconsultancy Ltd | Information & communication | 2025 |
| A.Musca Ltd | Construction | 2015 |
| A.N Care Ltd | Health & social care | 2014 |
| A.N Food Takeaway Ltd | Hospitality | 2025 |
| A.N. Contract Services Limited | Other services | 1990 |
| A.N. Greek Restaurant Ltd | Hospitality | 2019 |
| A.N. Polhill Farms Limited | Agriculture & fishing | 1996 |
| A.N. Rowland Limited | Agriculture & fishing | 1995 |
| A.N. Telecom (U.K.) Ltd | Information & communication | 1999 |
| A.N.A. Ferrum (UK) Ltd | Extraterritorial | 2012 |
| A.N.A. Rents Ltd | Hospitality | 2022 |
| A.N.D Creations Limited | Wholesale & retail | 2024 |
| A.N.D Electronics Limited | Transport & logistics | 2014 |
| A.N.D Sovereign Group UK Limited | Information & communication | 2026 |
| A.N.K Communications Ltd | Professional & scientific | 2019 |
| A.N.L Consultancy Ltd | Administrative & support | 2013 |
| A.N.M Speaking Ltd | Education | 2023 |
| A.N.O Properties Ltd | Real estate | 2024 |
| A.N.S Advice Ltd | Administrative & support | 2022 |
| A.N.S.Steels and Construction Ltd | Construction | 2020 |
| A.N.T Publishing Limited | Information & communication | 2006 |
| A.N.T. Recordings Limited | Information & communication | 2016 |
| A.N.Y Partners Ltd | Real estate | 2026 |
| A.N.Y. UK Holdings Ltd | Financial services | 2019 |
| A.Naim Ltd | Information & communication | 2025 |
| A.Naz Estates Limited | Real estate | 2025 |
| A.O Property Solutions Ltd | Real estate | 2023 |
| A.O Renovations Ltd | Construction | 2022 |
| A.O. Cleaning & Estate Limited | Administrative & support | 2026 |