| Asamai Mandir Trust (London) Limited | Other services | 2007 |
| Asap Business Services Ltd | Transport & logistics | 2012 |
| ASD Retail Ltd | Wholesale & retail | 2024 |
| ASE Construction Ltd | Other services | 2019 |
| ASEL19 Limited | Hospitality | 2023 |
| Asensini Ltd | Transport & logistics | 2018 |
| ASH Plumbing Heating Work Limited | Energy | 2023 |
| Asha Hope Ltd | Real estate | 2024 |
| Ashish Patel IT Ltd | Information & communication | 2017 |
| Ashmathu Limited | Real estate | 2022 |
| ASK Houses Limited | Real estate | 2021 |
| Askk Building Services Ltd | Construction | 2010 |
| ASM Property Investments Limited | Real estate | 2019 |
| Asma Electrical Ltd | Construction | 2018 |
| Asmara Haulage Ltd | Transport & logistics | 2015 |
| Aspar London Ltd | Construction | 2023 |
| Aspis Construction Ltd | Construction | 2020 |
| Asset 11 Limited | Financial services | 2022 |
| Association of British Tamil Lawyers Limited | Other services | 2021 |
| Asvy Ltd | Wholesale & retail | 2006 |
| AT Safety Consulting Ltd | Other services | 2025 |
| Atcliffe Consulting Ltd | Professional & scientific | 2015 |
| Athavan Construction Ltd | Construction | 2024 |
| Atlantic Fisheries Ltd | Wholesale & retail | 2025 |
| Atlas Digital Consulting Ltd | Wholesale & retail | 2024 |
| Audio Visual London Ltd | Information & communication | 2014 |
| Audoka Ltd | Construction | 2015 |
| Aulakh Design and Build Limited | Construction | 2023 |
| Aura Energy Group Limited | Wholesale & retail | 2018 |
| Aura London Ltd | Other services | 2022 |
| Aurelian Property Holdings Limited | Real estate | 2025 |
| Aurocom Comunications Limited | Information & communication | 2025 |
| Aurum Abayas Ltd | Wholesale & retail | 2025 |
| Auto Entrepreneur Ltd | Administrative & support | 2025 |
| Auto Glock Ltd | Wholesale & retail | 2023 |
| Auto Green Car Hire Ltd | Administrative & support | 2019 |
| Autolive Limited | Professional & scientific | 2011 |
| AV Digger Services Ltd | Construction | 2025 |
| AV Retails Ltd | Wholesale & retail | 2023 |
| Avad Property Investments Limited | Real estate | 2000 |
| Avanea Matera Services Limited | Construction | 2009 |
| Avenue by Munjal's Ltd. | Real estate | 2024 |
| Avmj Homes Ltd | Real estate | 2019 |
| Avocado Inc. Limited | Information & communication | 2012 |
| Avviro Ltd | Professional & scientific | 2013 |
| Avyaan Property Ltd | Real estate | 2024 |
| Awwal Ltd | Transport & logistics | 2019 |
| Axis Global Consulting Ltd | Information & communication | 2025 |
| Axus Ltd | Real estate | 2010 |
| Ayesha Khurshid Ltd | Wholesale & retail | 2025 |
| AZ Linguistics Limited | Professional & scientific | 2017 |
| AZ Motoring World Ltd | Wholesale & retail | 2020 |
| Azalova Consult Ltd | Professional & scientific | 2013 |
| Azraaliadam Limited | Professional & scientific | 2021 |
| B & M GBS Ltd | Other services | 2014 |
| B&B Construction UK Ltd | Construction | 2009 |
| B-Line Logistics Limited | Transport & logistics | 2012 |
| B1AR X Logistic Limited | Wholesale & retail | 2018 |
| B2B UK Enterprise Ltd | Construction | 2022 |
| B4S Solutions Limited | Administrative & support | 2025 |
| Babby Properties Ltd | Real estate | 2025 |
| Baby Brands Direct Ltd | Wholesale & retail | 2000 |
| Baby Properties Ltd | Information & communication | 2019 |
| BAD BEE Cosmetics Ltd | Wholesale & retail | 2024 |
| Baitongthaimassage Limited | Other services | 2020 |
| Baker Electrical Services Limited | Construction | 2015 |
| Bakers Parlour Limited | Hospitality | 2020 |
| Bakers Wood Limited | Real estate | 2021 |
| Balacio Ltd | Wholesale & retail | 2023 |
| Balanced Health London Ltd | Other services | 2022 |
| Bally Property Company Limited | Real estate | 2017 |
| Balselgess Limited | Health & social care | 2018 |
| Banatim Limited | Construction | 2021 |
| Band Stacker Ltd | Wholesale & retail | 2022 |
| Bandhan Fruits and VEG Limited | Wholesale & retail | 2025 |
| Banger Bites Limited | Wholesale & retail | 2025 |
| Banyan Healthcare Cherry Tree Ltd | Health & social care | 2025 |
| Banyan Healthcare Holdings Ltd | Health & social care | 2025 |
| Banyan Healthcare Ltd | Health & social care | 2019 |
| Banyan Healthcare Seacliff Ltd | Health & social care | 2025 |
| BAR105 Events Ltd | Hospitality | 2023 |
| Barari Ltd | Agriculture & fishing | 2018 |
| Barkeley Homes Limited | Real estate | 2016 |
| Barking Best International Supermarket Ltd | Wholesale & retail | 2026 |
| Barn and Bees Ltd | Hospitality | 2024 |
| Barnala Group Ltd | Construction | 2024 |
| Barrt Houses Ltd | Real estate | 2022 |
| Basement Tech Ltd | Construction | 2019 |
| Basirat Ltd | Wholesale & retail | 2024 |
| Bateman Capital Ltd | Wholesale & retail | 2023 |
| Battlay Limited | Construction | 2026 |
| Baylyn Health & Wellbeing Services Limited | Health & social care | 2014 |
| BB Burgers Takeaways Limited | Hospitality | 2024 |
| BB Distribution Ltd | Wholesale & retail | 2013 |
| BBC Lighting Construction Ltd | Manufacturing | 2014 |
| BDA Development Ltd | Construction | 2020 |
| BDA Plasterers Ltd | Construction | 2013 |
| Bdmc Trading Limited | Administrative & support | 2020 |
| BE Chauffeured Ltd | Transport & logistics | 2024 |
| Beacon Transport Ltd | Transport & logistics | 2026 |