| A1 Prime Trading Limited | Wholesale & retail | 2025 |
| A1 UK Superstore Limited | Wholesale & retail | 2015 |
| A12JAN Developments Ltd | Real estate | 2022 |
| A12JAN Ltd | Real estate | 2025 |
| A1MARQUEE Hires Limited | Professional & scientific | 2022 |
| A2MAR Consultancy Limited | Professional & scientific | 2014 |
| A2Z Bridging 1 Ltd | Professional & scientific | 2026 |
| A2Z Bridging Limited | Financial services | 2018 |
| A2Z Build Ltd | Construction | 2021 |
| A2Z Legal Ltd | Professional & scientific | 2026 |
| A2Z Lending Ltd | Financial services | 2024 |
| A2Z UK Accountants Limited | Professional & scientific | 2018 |
| A2ZDEALSMART Ltd | Wholesale & retail | 2025 |
| A3N Consulting Limited | Information & communication | 2016 |
| A3N Home Solutions Ltd | Wholesale & retail | 2025 |
| A3N Solution Ltd | Real estate | 2024 |
| A4 Autoparts Ltd | Wholesale & retail | 2014 |
| A786 Ltd | Information & communication | 2025 |
| AA Bespoke Joiners Limited | Construction | 2022 |
| AA Concrete UK Ltd | Manufacturing | 2019 |
| AA Global Ltd | Wholesale & retail | 2019 |
| AA Trader Ltd | Wholesale & retail | 2018 |
| Aa&Z Ltd | Wholesale & retail | 2025 |
| AAA Emporia Limited | Transport & logistics | 2019 |
| AAA Harrow Limited | Real estate | 2024 |
| AAA London Invetments Ltd | Construction | 2024 |
| AAA Online Hub Ltd | Wholesale & retail | 2026 |
| AAA Plumbing & Heating Services Ltd | Construction | 2025 |
| AAA Transport Service Ltd | Transport & logistics | 2013 |
| Aaam GUL Limited | Transport & logistics | 2026 |
| AAC IT Ltd | Professional & scientific | 2020 |
| Aadiguru Solutions Ltd | Information & communication | 2022 |
| Aadii Logistics Ltd | Transport & logistics | 2025 |
| AAG Tiling Ltd | Construction | 2025 |
| AAJ Smart Service Ltd. | Construction | 2020 |
| Aaliyaan and Co Ltd | Wholesale & retail | 2024 |
| AAM Marketplace Limited | Wholesale & retail | 2025 |
| Aamoda IT Solutions Limited | Information & communication | 2011 |
| AAN Consultants Ltd | Professional & scientific | 2026 |
| AAN PVT Limited | Wholesale & retail | 2024 |
| AAN Ventures Ltd | Real estate | 2025 |
| Aanib Ltd | Real estate | 2024 |
| Aapogi Ltd | Other services | 2025 |
| Aaqa Foods Ltd | Hospitality | 2015 |
| Aaqa Halal Meat & Groceries Ltd | Wholesale & retail | 2012 |
| Aarez World Travel Ltd | Administrative & support | 2025 |
| Aaron Consultants Ltd | Construction | 2025 |
| Aaron Cover Ltd | Financial services | 2023 |
| Aars Investments Ltd | Administrative & support | 2025 |
| Aaryasmi Consultancy Ltd | Wholesale & retail | 2008 |
| AAS VIJ Ltd | Transport & logistics | 2025 |
| Aasra Consultancy Ltd | Professional & scientific | 2026 |
| Aavatar Ltd | Information & communication | 2025 |
| Aayamax Global Solutions (UK) Ltd | Wholesale & retail | 2025 |
| Aayan Global Trading (UK) Limited | Wholesale & retail | 2014 |
| Aayla Collection Ltd | Wholesale & retail | 2023 |
| Aayla Wholesale Ltd | Wholesale & retail | 2023 |
| Aayu IT Solutions Ltd | Information & communication | 2019 |
| Aayusha Limited | Hospitality | 2026 |
| Aaza Properties Ltd | Real estate | 2024 |
| AB and P Developments Limited | Professional & scientific | 2016 |
| AB Associates London Ltd | Real estate | 2021 |
| AB Bold Enterprise Ltd | Wholesale & retail | 2025 |
| AB Chahal Construction Ltd | Construction | 2024 |
| AB Construction & Development Ltd | Construction | 2015 |
| AB Global Solutions Limited | Other services | 2018 |
| AB Hayer Construction Ltd | Construction | 2021 |
| AB Investments London Ltd | Real estate | 2020 |
| AB Kitchen Bedroom Ltd | Manufacturing | 2024 |
| AB Solutions Limited | Administrative & support | 2024 |
| Ab&Hd Builders Ltd | Construction | 2023 |
| AB7 Ltd | Construction | 2026 |
| Abbas.Poultry Ltd | Hospitality | 2017 |
| Abbie's Afro Shop Limited | Wholesale & retail | 2026 |
| ABC Cargo & Courier UK Limited | Transport & logistics | 2023 |
| ABC IT and Business Solutions Ltd | Information & communication | 2022 |
| ABC Restaurants Ltd | Hospitality | 2019 |
| Abcd Haulage Limited | Transport & logistics | 2019 |
| Abdul Majid CIC | Health & social care | 2024 |
| Abdul Manan Ltd | Wholesale & retail | 2025 |
| Abhi Foods Ltd | Wholesale & retail | 2022 |
| Abhis Brand Limited | Wholesale & retail | 2025 |
| Abhisheks Agency & Consultancy Services Ltd | Manufacturing | 2024 |
| Abir Property Limited | Real estate | 2025 |
| Abisam Limited | Information & communication | 2014 |
| ABK Maintenance Ltd | Construction | 2020 |
| ABL Partnership Ltd | Professional & scientific | 2025 |
| ABL Properties Limited | Real estate | 2018 |
| ABM Facilities Management Ltd | Professional & scientific | 2023 |
| ABM Services Ltd | Construction | 2019 |
| ABS Build & Design Ltd | Construction | 2022 |
| ABS Property London Ltd | Real estate | 2023 |
| Absarah UK Limited | Information & communication | 2023 |
| Absolute Better Homes and Gardens Ltd. | Construction | 2012 |
| Abss Property Ltd | Real estate | 2025 |
| Abundance Healthcare Limited | Health & social care | 2015 |
| Abundance Properties Ltd | Real estate | 2025 |
| Abwa Ltd | Manufacturing | 2025 |
| ABX Property Limited | Real estate | 2024 |
| Acacia Community Centre Limited | Other services | 2020 |