| A-Z Wash Ltd | Administrative & support | 2020 |
| A-Z Z-A Companies Limited | Professional & scientific | 2014 |
| A-Z Z-A COMPANIES1 Limited | Professional & scientific | 2022 |
| A-Z Zenith Technologies Ltd | Information & communication | 2023 |
| A-Zaba Limited | Other services | 2025 |
| A-Zed Cars Ltd | Administrative & support | 2026 |
| A-Zen Property Investments Ltd | Real estate | 2021 |
| A-Zgoods Limited | Wholesale & retail | 2024 |
| A. & Advice Ltd | Financial services | 2023 |
| A. & B. Kaye (Textiles) Limited | Wholesale & retail | 1958 |
| A. & B. Rudge Limited | Real estate | 1950 |
| A. & C. Black (Distribution) Limited | Information & communication | 1974 |
| A. & C. Black Limited | Information & communication | 1915 |
| A. & C. Developments Limited | Households | 1987 |
| A. & H. Nominees Limited | Administrative & support | 1967 |
| A. & J. Mucklow (Estates) Limited | Real estate | 1963 |
| A. & J. Mucklow (Ettingshall Estate) Limited | Real estate | 1956 |
| A. & J. Mucklow (Investments) Limited | Real estate | 1972 |
| A. & J. Mucklow (Lancashire) Limited | Real estate | 1963 |
| A. & J. Mucklow (Properties) Limited | Real estate | 1963 |
| A. & J. Speelman Limited | Wholesale & retail | 1975 |
| A. & T. Flooring Limited | Construction | 1974 |
| A. & W.Pounds Limited | Wholesale & retail | 1956 |
| A. a. C Management (UK) Limited | Real estate | 2020 |
| A. a. Fine Casting Limited | Manufacturing | 1996 |
| A. Ahmed & Co (Acctt) Ltd | Professional & scientific | 2010 |
| A. Amor Writes Limited | Information & communication | 2020 |
| A. and J. Mucklow (Lands) Limited | Real estate | 1951 |
| A. Arfa Ltd | Information & communication | 2025 |
| A. B. International Ventures Limited | Professional & scientific | 1973 |
| A. B. Rollings Clothiers Ltd | Manufacturing | 2019 |
| A. Baily and Company Limited | Real estate | 1909 |
| A. Banger Limited | Construction | 2023 |
| A. Baveystock & Co., Limited | Extraterritorial | 1980 |
| A. Beckman Limited | Wholesale & retail | 1958 |
| A. Black Properties Limited | Financial services | 2016 |
| A. Butler & Sons (Holdings) Limited | Other services | 2007 |
| A. C. a. Limited | Other services | 1961 |
| A. C. B. Estates Limited | Households | 2003 |
| A. C. Colquhoun Ltd | Administrative & support | 2017 |
| A. Commane Builders Limited | Construction | 2005 |
| A. Create Limited | Professional & scientific | 2011 |
| A. D. Architectural Design Limited | Professional & scientific | 2005 |
| A. D. Design Concepts Limited | Professional & scientific | 2008 |
| A. D. General Building Ltd | Construction | 2019 |
| A. Dakri & Co. Limited | Hospitality | 1967 |
| A. F. KIP Ltd | Wholesale & retail | 2017 |
| A. Freeman (Precious Stones) Limited | Wholesale & retail | 1944 |
| A. Frumkin Investments Ltd. | Real estate | 1993 |
| A. Fudge & Sons Limited | Wholesale & retail | 1983 |
| A. G. E Productions Ltd | Information & communication | 2021 |
| A. G. H. Optics Ltd | Health & social care | 2025 |
| A. G. Precision (Huntingdon) Limited | Manufacturing | 1973 |
| A. G. Utilities Limited | Construction | 2017 |
| A. Galla Funeral Directors Ltd | Other services | 2013 |
| A. Gooner Ltd. | Real estate | 1997 |
| A. H. DE Quatre Ltd. | Information & communication | 2014 |
| A. Habeshis Limited | Real estate | 2014 |
| A. Hanna & Sons Pianos Limited | Wholesale & retail | 2003 |
| A. Hart Property & Investments Limited | Real estate | 2018 |
| A. Holt & Sons Limited | Wholesale & retail | 1921 |
| A. Hound Associates Ltd | Professional & scientific | 2019 |
| A. Humic. Transport Ltd | Transport & logistics | 2021 |
| A. Hunt & Co (City) Limited | Other services | 2009 |
| A. J. F Advisors Ltd | Financial services | 2023 |
| A. J. Twynam Consultancy Services Ltd. | Mining & quarrying | 2018 |
| A. Jones Group Limited | Financial services | 2025 |
| A. Jones Joinery Limited | Manufacturing | 2023 |
| A. Jones Properties Ltd | Real estate | 2023 |
| A. K. Ventures Limited | Other services | 2007 |
| A. K. Harfield Steeplejacks Ltd | Construction | 2020 |
| A. K. K. Studios Ltd | Arts & recreation | 2013 |
| A. K. Locksmiths Ltd | Extraterritorial | 2004 |
| A. K. Muller (UK) Limited | Manufacturing | 1993 |
| A. Kalli Franchising Limited | Other services | 2014 |
| A. Kapllaj Limited | Construction | 2012 |
| A. Karoly Limited | Professional & scientific | 2013 |
| A. Keller & Sons (Holdings) Limited | Real estate | 1944 |
| A. Keller & Sons Limited | Wholesale & retail | 1957 |
| A. Key Osteopathy Ltd | Health & social care | 2021 |
| A. Kitangalala Ltd | Transport & logistics | 2014 |
| A. Kosijer and Family C&C Ltd | Financial services | 2026 |
| A. L. Shipping Ltd | Administrative & support | 1991 |
| A. Lamb Associates Limited | Construction | 2001 |
| A. Lukosius Ltd | Construction | 2016 |
| A. M. DRY Cleaners 2025 Limited | Other services | 2024 |
| A. M. Kenilworth Limited | Administrative & support | 2009 |
| A. M. Qattan Foundation | Education | 1987 |
| A. Marullo Studios Ltd | Wholesale & retail | 2023 |
| A. Metathron Ltd | Professional & scientific | 2005 |
| A. Neaverson & Sons Limited | Professional & scientific | 1934 |
| A. Nicastro Engineering Limited | Professional & scientific | 2003 |
| A. Nolan Limited | Wholesale & retail | 1997 |
| A. Nuguman Ltd | Wholesale & retail | 2023 |
| A. O. Quinn Ltd | Manufacturing | 2024 |
| A. Oliveros Ltd | Wholesale & retail | 2021 |
| A. Pacak Design Ltd | Manufacturing | 2004 |
| A. Petrov Construction Ltd | Construction | 2019 |
| A. Piper Building Limited | | 1984 |
| A. Poortman (London) Limited | Wholesale & retail | 1950 |