| A. Porter Care Services Ltd | Health & social care | 2016 |
| A. Properties Ltd | Real estate | 2026 |
| A. Quinn Limited | Arts & recreation | 2003 |
| A. R. & V. Properties (NO 2) Limited | Real estate | 2019 |
| A. R. Z. Limited | Financial services | 2014 |
| A. S. Capital Ltd | Financial services | 2025 |
| A. S. Zanettos & Co. Limited | Professional & scientific | 2007 |
| A. Sahota Investments Ltd | Administrative & support | 2015 |
| A. Sandham Ltd | Construction | 2025 |
| A. Schierz Ltd | Other services | 2018 |
| A. Sesay Enterprises Ltd | Financial services | 2026 |
| A. Sjonell Invest Limited | Extraterritorial | 2018 |
| A. Smart Trading UK Ltd | Wholesale & retail | 2024 |
| A. Smith Enterprises Limited | Arts & recreation | 1982 |
| A. Smith Holdings Limited | Arts & recreation | 1998 |
| A. Smith Management Limited | Arts & recreation | 1998 |
| A. SYN Consulting Ltd | Professional & scientific | 2021 |
| A. T and SON Limited | Real estate | 2022 |
| A. T. Cross Limited | Wholesale & retail | 1979 |
| A. T. Griffith Limited | Financial services | 2012 |
| A. Tsifouti LAB Ltd | Information & communication | 2026 |
| A. U. Astrological Services Limited | Administrative & support | 2002 |
| A. Unica Ltd | Wholesale & retail | 2024 |
| A. V. Hoyer Ltd | Professional & scientific | 2018 |
| A. V. Networking Ltd | Wholesale & retail | 2020 |
| A. Wolf Ltd | Wholesale & retail | 2019 |
| A. Woods Services Limited | Administrative & support | 2009 |
| A. Woolston (Antiques) Limited | Wholesale & retail | 1990 |
| A. Z. Baidoo & Co. Limited | Administrative & support | 2014 |
| A.& E.Elkins Limited | Construction | 1965 |
| A.A & Sons Properties Ltd | Real estate | 2001 |
| A.A Automotive Dealership Limited | Wholesale & retail | 2021 |
| A.A Diamond Valeting Ltd | Wholesale & retail | 2023 |
| A.A Digital Solutions Ltd | Information & communication | 2024 |
| A.A Holdings London Ltd | Real estate | 2024 |
| A.A Partnership in Care Ltd | Health & social care | 2013 |
| A.A Pro Platforms Ltd | Construction | 2025 |
| A.A Property Maintenance Services Ltd | Construction | 2025 |
| A.A Wellbeing Co. Ltd | Professional & scientific | 2026 |
| A.A. Clark Limited | Wholesale & retail | 1911 |
| A.A. Company Services Limited | Professional & scientific | 1989 |
| A.A. Enterprise Consulting Ltd | Information & communication | 2026 |
| A.A. Field Mechanical Services Limited | Construction | 2005 |
| A.A. Gebhardt & K.P. Webster Ltd | Wholesale & retail | 2025 |
| A.A. Legacy Property Sourcing Ltd | Real estate | 2025 |
| A.A. Michaelides (Brook Green) Limited | Hospitality | 1963 |
| A.A. Narrative Interiors Ltd | Professional & scientific | 2026 |
| A.A. Property Services UK Limited | Real estate | 2000 |
| A.A.A.S Build Limited | Construction | 2017 |
| A.A.C.R & Ltd | Manufacturing | 2023 |
| A.A.D Corp Ltd | Professional & scientific | 2022 |
| A.A.K. Enterprises Limited | Real estate | 1980 |
| A.A.M Invests Ltd | Real estate | 2017 |
| A.A.M Property Limited | Real estate | 2015 |
| A.A.S Properties Limited | Real estate | 2003 |
| A.A.T. Properties (Herts) Limited | Real estate | 2017 |
| A.A.Z. Properties Limited | Real estate | 2001 |
| A.Abdullahi Ltd | Health & social care | 2022 |
| A.Advising Limited | Professional & scientific | 2024 |
| A.Ahmad Limited | Real estate | 2015 |
| A.Aka Limited | Professional & scientific | 2015 |
| A.Al-Asady Holdings Limited | Financial services | 2024 |
| A.Alves Ltd | Transport & logistics | 2016 |
| A.Andaloussi Art Studio Ltd | Information & communication | 2023 |
| A.B Alliance Limited | Administrative & support | 2023 |
| A.B Autos London Ltd | Wholesale & retail | 2020 |
| A.B Diagnostic Ultrasound Imaging Limited | Health & social care | 2023 |
| A.B Plumbing Solutions Ltd | Construction | 2025 |
| A.B Production Services Ltd | Arts & recreation | 2024 |
| A.B. & K Consulting Limited | Professional & scientific | 2011 |
| A.B. Butchers Limited | Wholesale & retail | 2010 |
| A.B. Car Service Limited | Wholesale & retail | 2012 |
| A.B. Commercial Surveyors Ltd | Construction | 2014 |
| A.B. Construction Building & Development Limited | Construction | 1998 |
| A.B. Construction Homes Ltd | Real estate | 2024 |
| A.B. Dick-Cleland (Underwriting Agencies) Limited | Financial services | 1963 |
| A.B. Dynamic Support Limited | Administrative & support | 2014 |
| A.B. Electronic Components Limited | Professional & scientific | 1957 |
| A.B. Equine Ltd | Agriculture & fishing | 2023 |
| A.B. Exploration Limited | Administrative & support | 1950 |
| A.B. Hotels (the Arch London) Limited | Hospitality | 2016 |
| A.B. Kucher Investment Advisors Ltd. | Administrative & support | 2008 |
| A.B. Mansfield & Sons Ltd. | Real estate | 2024 |
| A.B. Pappoe Consultancy & Advisory Ltd | Professional & scientific | 2026 |
| A.B. Polzeath Limited | Construction | 2012 |
| A.B. Proclean Limited | Administrative & support | 2016 |
| A.B. Produce PLC | Agriculture & fishing | 1988 |
| A.B. Produce Trading Limited | Financial services | 2006 |
| A.B. Serve Ltd | Transport & logistics | 2017 |
| A.B. ST Ives Limited | Construction | 2011 |
| A.B. SUR Mesure London Ltd | Hospitality | 2022 |
| A.B. Technologies IT LP | | 2019 |
| A.B.Ch Construction Ltd | Construction | 2023 |
| A.B.Dyne Motors Limited | Wholesale & retail | 1949 |
| A.B.F. Limited | Water & waste | 1933 |
| A.B.F. Nominees Limited | Professional & scientific | 1973 |
| A.B.F. Properties Limited | Construction | 1961 |
| A.B.F.Holdings Limited | Professional & scientific | 1936 |
| A.B.G Construction UK Ltd | Construction | 2021 |
| A.B.I. (Premises) Limited | Professional & scientific | 1985 |