| Atoz Global Ltd | Transport & logistics | 2019 |
| Attica Ltd | Wholesale & retail | 2022 |
| Attlas International Ltd | Professional & scientific | 2020 |
| Attol Consulting Ltd | Professional & scientific | 2020 |
| Attol Properties Limited | Real estate | 2024 |
| ATZ Services Ltd | Professional & scientific | 2021 |
| Augeo Autus Ventures (AAV) Ltd | Other services | 2014 |
| Auntie Jenny's Limited | Hospitality | 2025 |
| Aura Property Services Ltd | Real estate | 2021 |
| Aurixa Labs Ltd | Information & communication | 2026 |
| Aurora Borealis Property Limited | Real estate | 2020 |
| Aurora IT Consulting Ltd | Information & communication | 2018 |
| Ausmonitor Group Ltd | Information & communication | 2023 |
| Auspicious Auto Limited | Wholesale & retail | 2013 |
| Aussie's Girls Limited | Hospitality | 2024 |
| Austen Allen Healthcare Limited | Health & social care | 2008 |
| Auto Masterz Driving School Ltd | Education | 2023 |
| Auto-Cruze Motors Centre Ltd | Wholesale & retail | 2025 |
| Autolocks Kent Ltd | Manufacturing | 2008 |
| Autonetics Limited | Professional & scientific | 2020 |
| Autosim Limited | Administrative & support | 2025 |
| Autotech in Car Solutions Limited | Wholesale & retail | 2008 |
| Autotek Solutions Ltd | Wholesale & retail | 2017 |
| Autowheels of Dartford Limited | Wholesale & retail | 2010 |
| AV Bifold Doors Ltd | Construction | 2024 |
| AV Ventilation Ltd | Construction | 2018 |
| AVA Event Design Ltd | Hospitality | 2023 |
| AVA SC Ltd | Administrative & support | 2025 |
| Avalanche Pallets Ltd | Water & waste | 2025 |
| Avazak Ltd | Administrative & support | 2022 |
| AVELON88 Ltd | Health & social care | 2025 |
| Avenue One Homes Ltd | Construction | 2023 |
| Avenue Publicity Limited | Professional & scientific | 2024 |
| AVENUE1 Recordings Limited | Information & communication | 2011 |
| Avighna IT Services Limited | Information & communication | 2019 |
| Avina Care Group Ltd | Health & social care | 2025 |
| Avishalom Homes Ltd | Real estate | 2023 |
| Avishree Ltd | Wholesale & retail | 2026 |
| AVK Fast Food Ltd | Hospitality | 2024 |
| Avon Court Residents Association Limited | Households | 1990 |
| Avross Limited | Real estate | 2024 |
| AW Payroll Limited | Professional & scientific | 2014 |
| Awanetwork CIC | Information & communication | 2024 |
| Award Interiors Limited | Manufacturing | 2008 |
| Away Fishing Ltd | Administrative & support | 2015 |
| Away From the Screen Limited | Wholesale & retail | 2021 |
| Away Transport Limited | Administrative & support | 2015 |
| Awesome DOT Ltd | Professional & scientific | 2024 |
| AWN Plumbing & Water Treatment Ltd | Construction | 2026 |
| Axeed Limited | Wholesale & retail | 2020 |
| AXIOM555 Limited | Construction | 2015 |
| Axis Intelligence Ltd | Wholesale & retail | 2025 |
| Axis Media Services Ltd | Information & communication | 2018 |
| Axis Southern Limited | Construction | 2019 |
| AXL Media Limited | Professional & scientific | 2018 |
| Axza Group Ltd | Professional & scientific | 2025 |
| Aybm Consulting Limited | Administrative & support | 2014 |
| Ayea Ltd | Information & communication | 2019 |
| Aylmer Road Limited | Real estate | 2015 |
| AYO LAM Care International Ltd | Health & social care | 2012 |
| Ayoka Eats Ltd | Hospitality | 2023 |
| Ayope Homes Ltd | Real estate | 2019 |
| Ayotte's Recruitment and Training Academy Ltd | Administrative & support | 2022 |
| Azadar Ltd | Hospitality | 2023 |
| Azalea Investment London Limited | Real estate | 2021 |
| Azilhomes Ltd | Real estate | 2025 |
| Azinegro Limited | Construction | 2025 |
| Azitek Ltd | Construction | 2022 |
| Aziz Quick Coffee Ltd | Hospitality | 2008 |
| AZN Shah Limited | Wholesale & retail | 2025 |
| Azna Limited | Real estate | 2024 |
| Azorst Business Solutions Limited | Professional & scientific | 2013 |
| Aztec Scaffolding(South East) Ltd | Construction | 2025 |
| Aztech Fire & Security Limited | Administrative & support | 2025 |
| Aztine Technoloy Co., Ltd | Wholesale & retail | 2021 |
| A’S Cars ( Dartford) Ltd | Transport & logistics | 2021 |
| B & a Miles Associates Limited | Wholesale & retail | 2002 |
| B & H Haulage Ltd | Transport & logistics | 2015 |
| B & I Proservices Ltd | Information & communication | 2014 |
| B & S Ltd | Water & waste | 2025 |
| B & S Properties Limited | Real estate | 2017 |
| B Billa Construction Ltd | Construction | 2023 |
| B Green Cafe Ltd | Hospitality | 2026 |
| B H F Graphics Limited | Manufacturing | 2008 |
| B Haulage Limited | Transport & logistics | 2017 |
| B R Partners Ltd | Professional & scientific | 2012 |
| B S Motors (Farningham) LLP | | 2011 |
| B Squared Property Management Ltd | Real estate | 2012 |
| B T Seal Electrical Services Ltd | Manufacturing | 2026 |
| B&K Electrics Ltd | Construction | 2024 |
| B&M Ventures Ltd | Other services | 2019 |
| B&S Beckenham Sushi Ltd | Wholesale & retail | 2022 |
| B&S Greenwich Sushi Limited | Wholesale & retail | 2024 |
| B&S Network and Security Limited | Construction | 2024 |
| B&Z Goods Trading Ltd | Wholesale & retail | 2020 |
| B'S Treats Limited | Hospitality | 2025 |
| B.A.W Commercials Limited | Manufacturing | 2012 |
| B2E & Community Program U.K Trust | Professional & scientific | 2014 |
| BA Construction Ltd | Construction | 2025 |
| BAA Houses Limited | Real estate | 2023 |