| A&S Prestige Property Ltd | Real estate | 2020 |
| A&S Private Equity Ltd | Real estate | 2020 |
| A&S Suites Limited | Real estate | 2025 |
| A&S Wholesale and Retail Ltd | Wholesale & retail | 2023 |
| A&T Business Insight Management Ltd | Information & communication | 2025 |
| A&T Digital UK Limited | Wholesale & retail | 2025 |
| A&T Foods Limited | Hospitality | 2025 |
| A&T Tree Services Limited | Agriculture & fishing | 2019 |
| A&U Motors Ltd | Wholesale & retail | 2023 |
| A&U Smart Shop Limited | Wholesale & retail | 2026 |
| A&W Housing Ltd | Real estate | 2020 |
| A&Y Blinds Ltd | Manufacturing | 2022 |
| A&Y Development Ltd | Construction | 2018 |
| A&Y Dynamics Ltd | Information & communication | 2025 |
| A&Z 360 Property Ltd | Real estate | 2024 |
| A&Z Consultancy Ltd | Real estate | 2025 |
| A&Z Properties Limited | Real estate | 2002 |
| A, L & Co Management Consulting Ltd | Professional & scientific | 2019 |
| A, T & S Properties Limited | Real estate | 2016 |
| A-Cube PVT UK Limited | Wholesale & retail | 2025 |
| A-Force Security Group Ltd | Administrative & support | 2023 |
| A-Kounts Connect Limited | Professional & scientific | 2015 |
| A-Lectrical Services Ltd | Construction | 2021 |
| A-Level Excellence Ltd | Education | 2026 |
| A-Mark Alliance Ltd | Real estate | 2016 |
| A-Mat Healthcare Limited | Health & social care | 2016 |
| A-Net Professionals Limited | Professional & scientific | 2024 |
| A-One Style Ltd | Wholesale & retail | 2017 |
| A-One Transportation and Trading (UK) Limited | Wholesale & retail | 2025 |
| A-Plus Heating & Cooling Ltd | Manufacturing | 2024 |
| A-Plus Investment Limited | Real estate | 2020 |
| A-Prop Services Limited | Real estate | 2024 |
| A-Qa Services Limited | Education | 2025 |
| A-Rated Doors & Windows Ltd | Manufacturing | 2018 |
| A-S 1 Auto’S Ltd | Wholesale & retail | 2025 |
| A-Sarhan Ltd | Information & communication | 2024 |
| A-Spirit Ltd | Health & social care | 2022 |
| A-Star Apartments Ltd | Hospitality | 2026 |
| A-Star Painters & Decorators Ltd | Construction | 2020 |
| A-Star Traffic Ltd | Construction | 2016 |
| A-Star Transportation UK Ltd | Transport & logistics | 2026 |
| A-Systems Trading UK Ltd | Wholesale & retail | 2024 |
| A-Team Academy Ltd | Education | 2017 |
| A-Team Barbers Ltd | Other services | 2025 |
| A-Team Commercial Vehicles Ltd | Wholesale & retail | 2024 |
| A-Team Health Recruitment Limited | Administrative & support | 2004 |
| A-Tech Roofing & Guttering Ltd | Construction | 2025 |
| A-Tech Solutions (UK) Ltd | Information & communication | 2022 |
| A-Transport-Ltd Ltd | Transport & logistics | 2014 |
| A-Trim Autosales Limited | Wholesale & retail | 2021 |
| A-Z Management 001 Ltd | Professional & scientific | 2021 |
| A-Z Certified Accountants Limited | Professional & scientific | 2011 |
| A-Z Communication Services Limited | Information & communication | 2006 |
| A-Z Educare Ltd | Education | 2022 |
| A-Z Physio Ltd | Real estate | 2013 |
| A-Z Royal Heating Ltd | Construction | 2022 |
| A-Z Softwares Limited | Information & communication | 2020 |
| A-Z UK Construction Ltd | Construction | 2022 |
| A. & D. Lock and Key Co. Limited | Manufacturing | 1975 |
| A. & H. Construction and Developments PLC | Construction | 1991 |
| A. and Lakis Kebab Limited | Wholesale & retail | 1998 |
| A. Bashir & Co Limited | Professional & scientific | 2006 |
| A. Butchers Limited | Manufacturing | 2025 |
| A. C. Cleaning Services Ltd | Other services | 2015 |
| A. Charles Chef Services Limited | Hospitality | 2012 |
| A. Evans Limited | Professional & scientific | 2011 |
| A. Hampshire Transport Ltd | Transport & logistics | 2003 |
| A. J. Doughty Limited | Construction | 2000 |
| A. J. Mannings Extreme Body Challenge Limited | Arts & recreation | 2019 |
| A. J. Paveley & Co. Ltd | Wholesale & retail | 2013 |
| A. J. Prosser & Sons Limited | Real estate | 1981 |
| A. Jones Property Investments Ltd | Real estate | 2022 |
| A. Lewis & Sons Limited | Manufacturing | 1948 |
| A. Maos Limited | Wholesale & retail | 2013 |
| A. RAM Roofing & Scaffolding Services Limited | Construction | 2007 |
| A. S. Fruit & VEG Limited | Wholesale & retail | 2011 |
| A. Sadikot Ltd | Health & social care | 2015 |
| A. Steel Installations Ltd | Construction | 2015 |
| A. Surman & Co. Limited | Construction | 1956 |
| A.1 Properties Sales & Lettings Ltd | Real estate | 2010 |
| A.A. Enterprises Limited | | 1984 |
| A.A. Properties Birmingham Limited | Real estate | 2025 |
| A.A.H.T Limited | Professional & scientific | 2019 |
| A.A.I Property Services Limited | Households | 2023 |
| A.A.R Pharma Ltd | Health & social care | 2019 |
| A.Aden Limited | Administrative & support | 2024 |
| A.B.E. (Ledbury) Limited | Transport & logistics | 1989 |
| A.B.J. Comms Ltd | Information & communication | 2012 |
| A.B.S Roofing Midlands Ltd | Construction | 2003 |
| A.B.Taylor Funeral Services Limited | Other services | 1959 |
| A.Banerjee Dermatological Services Limited | Health & social care | 2014 |
| A.Bari KBS Ltd | Wholesale & retail | 2015 |
| A.Blake Holdings Ltd | Professional & scientific | 2025 |
| A.Bonaj Construction Ltd | Construction | 2026 |
| A.Botofei Ltd | Other services | 2025 |
| A.C.E Holdings U.K Limited | Real estate | 2022 |
| A.C.K. Materials Handling Limited | Manufacturing | 1991 |
| A.Chand Clinical Ltd | Public administration | 2026 |
| A.D.A.M.S. Housing Limited | Real estate | 1999 |
| A.D.E. Electrical Solutions Ltd | Construction | 2022 |