| A.B.L Global Funding Limited | Other services | 2024 |
| A.B.L. Perpack (1985) Limited | Wholesale & retail | 1985 |
| A.B.L. Textiles Limited | Wholesale & retail | 2024 |
| A.B.L.M. Invest Ventures Ltd | Wholesale & retail | 2019 |
| A.B.N.N Properties Limited | Real estate | 2026 |
| A.Barik Ltd. | Information & communication | 2018 |
| A.Best Trading Limited | Wholesale & retail | 2024 |
| A.Butler & Sons Limited | Manufacturing | 1917 |
| A.C Alida Care Limited | Administrative & support | 2021 |
| A.C Ductwork Services Ltd | Construction | 2011 |
| A.C Economic Research Limited | Information & communication | 2023 |
| A.C Hillz Ltd | Information & communication | 2025 |
| A.C Luxury Holiday Lets Ltd | Real estate | 2026 |
| A.C Rose Ltd | Wholesale & retail | 2020 |
| A.C Sika Limited | Health & social care | 2015 |
| A.C Trading Group Limited | Wholesale & retail | 2025 |
| A.C Waste and Removals Ltd | Water & waste | 2025 |
| A.C. & M.J. Brooks Limited | Wholesale & retail | 1966 |
| A.C. Cooper (Colour) Limited | Professional & scientific | 1960 |
| A.C. Cooper Limited | Professional & scientific | 2013 |
| A.C. Foreman Limited | Other services | 1951 |
| A.C. GOR & Son’S Ltd | Wholesale & retail | 2020 |
| A.C. Hotels (U.K.) Limited | Real estate | 1991 |
| A.C. Limex International Limited | Wholesale & retail | 2020 |
| A.C. Smile Project Ltd | Health & social care | 2026 |
| A.C.A. Heya Sprouts Ltd. | Professional & scientific | 2017 |
| A.C.A. Management Services Limited | Professional & scientific | 1994 |
| A.C.Buckoke & Sons Limited | Manufacturing | 1972 |
| A.C.C. Associates (Export) Limited | Professional & scientific | 1954 |
| A.C.C. Worldwide Limited | Professional & scientific | 2006 |
| A.C.E Motoring & Recovery Ltd | Wholesale & retail | 2026 |
| A.C.E.P.H. (Academy of Clinical, Experimental & Psychotherapeutic Hypnosis) Ltd. | Education | 2023 |
| A.C.J. Computer Services Limited | Information & communication | 1988 |
| A.C.Ldn Ltd | Other services | 2024 |
| A.C.M East Ltd | Construction | 2015 |
| A.C.M. (UK) | | 1996 |
| A.C.M. Services | | 1996 |
| A.C.M. Shipping USA Limited | Transport & logistics | 2013 |
| A.C.O LMT Ltd | Wholesale & retail | 2026 |
| A.C.O.R.D (Agency for Co-Operation and Research in Development/Association DE Cooperation ET DE Recherche Pour LE Developpement) | Health & social care | 1981 |
| A.C.R Roofing & Home Improvements Ltd | Construction | 2025 |
| A.C.Sheehan Ltd | Arts & recreation | 2010 |
| A.C.T. Audit Limited | Professional & scientific | 2016 |
| A.C.T. Capital Advisers Limited | Professional & scientific | 2018 |
| A.C.T. Developments Ltd | Professional & scientific | 2010 |
| A.C.T. London Limited | Professional & scientific | 2002 |
| A.C.T.S Global Ltd | Professional & scientific | 2010 |
| A.C.Tours Limited | Administrative & support | 1999 |
| A.C.Y Properties Limited | Real estate | 2021 |
| A.Cap Investments Limited | Construction | 2018 |
| A.Cap Management Limited | Construction | 2018 |
| A.Ceylan Ltd | Information & communication | 2018 |
| A.Charles Capital Holdings Ltd | Financial services | 2025 |
| A.D & JO Consultancy Limited | Professional & scientific | 2026 |
| A.D Accounting Solutions Ltd | Professional & scientific | 2021 |
| A.D Jeriel Ltd | Information & communication | 2015 |
| A.D London Developments Ltd | Construction | 2024 |
| A.D Plastering Services Ltd | Construction | 2022 |
| A.D Property Ltd | Real estate | 2025 |
| A.D Scaffolding Ltd | Construction | 2019 |
| A.D. Artworks Ltd | Information & communication | 2024 |
| A.D. Bannister Roofing & Building Ltd | Construction | 1997 |
| A.D. Creative Consultants Limited | Professional & scientific | 1973 |
| A.D. Global Company Limited | Hospitality | 2003 |
| A.D. Global Group LLP | | 2023 |
| A.D. Productions Limited | Arts & recreation | 1981 |
| A.D. Services and Solutions Ltd | Professional & scientific | 2020 |
| A.D.E Total Building & Maintenance Ltd | Construction | 2024 |
| A.D.J. Z. Real Estate Ltd | Extraterritorial | 2024 |
| A.D.Jones Kitchens & Bathrooms Limited | Wholesale & retail | 1990 |
| A.D.K Capital Ltd | Financial services | 2025 |
| A.D.Kh Ltd | Real estate | 2020 |
| A.D.L. Security Services Limited | Administrative & support | 1987 |
| A.D.M Bayern Trade and Finance Limited | Construction | 2021 |
| A.D.T. Trading Ltd | Households | 2018 |
| A.D.W Development Solutions Ltd | Construction | 2023 |
| A.Din Electronics PVT Ltd | Wholesale & retail | 2018 |
| A.Distribution Limited | Wholesale & retail | 2015 |
| A.Djedjeia Ltd | Professional & scientific | 2025 |
| A.Duraku Construction Ltd | Construction | 2024 |
| A.E Bargains Ltd | Wholesale & retail | 2023 |
| A.E Construction and Maintenance Limited | Construction | 2020 |
| A.E Food Ltd | Wholesale & retail | 2025 |
| A.E Spikes Limited | Wholesale & retail | 2025 |
| A.E. Callard (Engineering) Limited | Manufacturing | 1981 |
| A.E. Vaughan & Co. Limited | Wholesale & retail | 1991 |
| A.E.Bartholomew & Company Limited | Wholesale & retail | 1962 |
| A.E.C Group Holding Limited | Financial services | 2025 |
| A.E.F. Productions Limited | Information & communication | 2022 |
| A.E.F. Realty Ltd | Construction | 2023 |
| A.E.M.S. Commodities Limited | | 1984 |
| A.E.Monck Consultants Limited | Real estate | 2010 |
| A.Eames Limited | Wholesale & retail | 1938 |
| A.Ecsedi Ltd | Real estate | 2024 |
| A.Edwards Consulting Ltd | Professional & scientific | 2023 |
| A.Einhorn Limited | Real estate | 1959 |
| A.Electrical Services Ltd | Energy | 2015 |
| A.F Corporation Limited | Wholesale & retail | 2025 |
| A.F Property Solutions Ltd | Construction | 2018 |
| A.F. Browne Holdings Limited | Wholesale & retail | 2024 |