| Aliclare Estates Limited | Construction | 2024 |
| Alignment Search and Selection Limited | Administrative & support | 2018 |
| ALL 4 Electrical Limited | Construction | 2016 |
| ALL Stars Netball CIC | Arts & recreation | 2026 |
| Allier Bell Limited | Administrative & support | 2015 |
| Allure Hair Supplies Ltd | Wholesale & retail | 2023 |
| Allure Studios Ltd | Professional & scientific | 2017 |
| Alpha Aesthetics Ltd | Other services | 2025 |
| Alpha Plus Systems Limited | Information & communication | 1994 |
| Alvearium Estates Ltd | Real estate | 2024 |
| AM2PM Music Limited | Arts & recreation | 2017 |
| Amabuilt Limited | Construction | 2010 |
| Amandeep Aesthetics Ltd | Health & social care | 2022 |
| Amber Events Ltd | Administrative & support | 2020 |
| Ambicon Limited | Professional & scientific | 2018 |
| American Golf Car Wash Ltd | Wholesale & retail | 2013 |
| AMI Jade Cadillac Limited | Administrative & support | 2013 |
| Amity Estates Limited | Real estate | 2011 |
| AMP Building Services Ltd | Construction | 2017 |
| Anayra Investment Ltd | Real estate | 2022 |
| Anderson Gaskill Limited | Information & communication | 2021 |
| Anglegreen Investments Limited | Administrative & support | 2017 |
| Annabel's - Luxury Gift Emporium Limited | Wholesale & retail | 2011 |
| Another House Limited | Hospitality | 2015 |
| ANT Ventures Ltd | Professional & scientific | 2022 |
| Antique Telephones Limited | Professional & scientific | 2006 |
| Apex Urban Capital Limited | Construction | 2025 |
| APEXLEGACY18 Limited | Real estate | 2025 |
| Apml Property Ltd | Real estate | 2023 |
| Aptuary Ltd | Administrative & support | 2019 |
| ARC Accountants Ltd | Professional & scientific | 2025 |
| Archie Street RTM Company Limited | Households | 2011 |
| Argent Consultancy Services Ltd | Financial services | 2024 |
| ARJ Acquisitions Limited | Real estate | 2025 |
| ARK Clinic Limited | Professional & scientific | 2017 |
| Arnside (Chislehurst) Management Company Limited | Households | 1984 |
| Aroka Limited | Professional & scientific | 2008 |
| Ascend Athletics Ltd | Arts & recreation | 2026 |
| Ascot Golf (Holdings) Limited | Arts & recreation | 2002 |
| Ascot Golf School of Excellence Limited | Arts & recreation | 1997 |
| ASH Tree INS Brokers Limited | Financial services | 2022 |
| Ashokan Ltd | Other services | 2025 |
| ASL Groundwork and Building Ltd | Construction | 2018 |
| Aspie Plumbing & Heating Ltd | Construction | 2021 |
| Aspire Health Ltd | Health & social care | 2013 |
| Astley Solar Limited | Energy | 2014 |
| Astro Girls Animation Ltd | Information & communication | 2022 |
| Astro Girls Universe Ltd | Information & communication | 2022 |
| ATB LAD Ltd | Real estate | 2024 |
| Atem Studio Ltd | Other services | 2013 |
| Athena Security Solutions Employee Ownership Trustee Ltd | Professional & scientific | 2024 |
| Athena Security Solutions Ltd | Administrative & support | 2014 |
| Athena Trading Limited | Wholesale & retail | 2022 |
| Atlas Interactive Messenger Ltd | Wholesale & retail | 1999 |
| Atomic Warehouse Ltd | Wholesale & retail | 2019 |
| Atrium Gold Limited | Administrative & support | 2010 |
| Audial Properties Limited | Real estate | 2015 |
| Augury Limited | Professional & scientific | 2012 |
| Aurora Digital Post Ltd | Information & communication | 2012 |
| Austin House (Surbiton) Management Company Limited | Real estate | 2023 |
| Authentic Legal AI Limited | Information & communication | 2024 |
| Automa Digital Ltd | Professional & scientific | 2019 |
| Autonomy Academy Corporation Limited | Information & communication | 2025 |
| AVC Services Limited | Professional & scientific | 2022 |
| Avenue 42 Ltd | Information & communication | 2014 |
| Avniver Limited | Real estate | 2022 |
| Avonhurst (Camden Park Road) Limited | Households | 1997 |
| AVP Investments Limited | Real estate | 2018 |
| AVP Sales and Lettings Limited | Real estate | 2026 |
| Awbd Limited | Construction | 2016 |
| Axentivus Limited | Education | 2017 |
| Ayushi Asset Holding Ltd | Real estate | 2023 |
| Ayushi Consulting Limited | Real estate | 2020 |
| B and L Fibre Solutions Ltd | Information & communication | 2022 |
| B2L Investments 28MC Ltd | Administrative & support | 2016 |
| B2L Investments 61WC Ltd | Administrative & support | 2017 |
| B2L Investments 6MC Ltd | Administrative & support | 2016 |
| B2L Investments Ltd | Administrative & support | 2015 |
| B2L Investments MC Ltd | Administrative & support | 2016 |
| B2L Investments MR Ltd | Real estate | 2016 |
| B2L Investments PP LLP | | 2021 |
| B2L Investments RR Ltd | Administrative & support | 2016 |
| B2L Investments SR Ltd | Administrative & support | 2016 |
| B2L Investments WC Ltd | Administrative & support | 2016 |
| Babington House School Limited | Education | 1958 |
| Baca Ltd | Financial services | 2016 |
| Badgio Electrical Services Ltd | Construction | 2022 |
| Bailey's Carpet Ltd | Construction | 2015 |
| Baker Britt Limited | Professional & scientific | 2008 |
| Bakkara Limited | Financial services | 2016 |
| Balinga Bari Ltd | Real estate | 2026 |
| Ballara Limited | Construction | 2008 |
| Ballinar Limited | Other services | 2019 |
| Baltic Crest Ltd | Construction | 2023 |
| Bang Productions Ltd. | Information & communication | 2014 |
| Baton Ltd | Professional & scientific | 2025 |
| Batrise Limited | Real estate | 2014 |
| Battered Chislehurst Fish Limited | Hospitality | 2026 |
| Battery One Limited | Administrative & support | 1987 |
| Bavpav Limited | Professional & scientific | 2022 |