| Apexpropertymnt Ltd | Manufacturing | 2025 |
| Apexrescue Ltd | Transport & logistics | 2026 |
| Apoc Properties Ltd | Real estate | 2022 |
| Apolo Constructions Limited | Construction | 2020 |
| Apple Trading Ltd | Real estate | 2019 |
| Aqlm Limited | Construction | 2026 |
| Arbor & Iron Construction Ltd | Construction | 2026 |
| ARC Electrical Services London Ltd | Construction | 2009 |
| ARC Group Ltd | Wholesale & retail | 2018 |
| Arcane Jewels Ltd | Manufacturing | 2025 |
| Arfoote Eco-Renovations Ltd | Construction | 2025 |
| Ariana Exchange Limited | Financial services | 2006 |
| Aries Capital Ltd | Real estate | 2014 |
| Arjami Limited | Administrative & support | 2024 |
| Arkwell House Ltd | Real estate | 2017 |
| Arondizuogu Patriotic Union UK Women Wing (AWA) CIC | Health & social care | 2024 |
| Artur’S Painting&Decorating Limited | Construction | 2021 |
| ARV Renovation Limited | Construction | 2019 |
| ARY Real Estate Ltd | Construction | 2022 |
| ARZ Construction Ltd | Construction | 2020 |
| AS Gadgets Ltd | Manufacturing | 2024 |
| AS Valani Limited | Real estate | 2017 |
| AS YOU Like IT Creative Services Ltd | Professional & scientific | 2016 |
| Ascend Retail Solutions Limited | Wholesale & retail | 2024 |
| Asenampa Ltd | Wholesale & retail | 2021 |
| Asghar Property Services Ltd | Real estate | 2025 |
| Ashaff Global Ltd | Wholesale & retail | 2020 |
| Ashco Engineering Ltd | Construction | 2015 |
| ASI&KAT68 Ltd | Wholesale & retail | 2017 |
| Asibuo Company Limited | Real estate | 2020 |
| Asiedua Property Group Ltd | Households | 2024 |
| Askz Business Solutions Limited | Professional & scientific | 2026 |
| Aspire 2B: Centre of Learning and Personal Development CIC | Education | 2024 |
| Aspire Supported Living Services Ltd | Health & social care | 2020 |
| Assured Safety Associates Ltd | Extraterritorial | 2024 |
| Assured Space Ltd | Real estate | 2022 |
| Astar Valeting & Cleaning Services Ltd | Administrative & support | 2024 |
| Aster Property Investment Ltd | Real estate | 2026 |
| Asuonananom Ltd | Construction | 2026 |
| ATA Construction Ltd | Construction | 2019 |
| Aten Stone Ltd | Professional & scientific | 2024 |
| Atlantic Properties Investments Ltd | Construction | 2025 |
| Atlas Lounge Limited | Hospitality | 2026 |
| ATM Direct Limited | Health & social care | 2018 |
| Atos Executive Limited | Construction | 2019 |
| ATT Putney Builder Limited | Construction | 2018 |
| Attin Group Ltd | Wholesale & retail | 2025 |
| Attock Medical Limited | Health & social care | 2014 |
| Attuned Property Holdings Ltd | Real estate | 2021 |
| Atypical Stuff Ltd | Wholesale & retail | 2018 |
| Augustin Investment Ltd | Financial services | 2019 |
| AUM Saayee Limited | Wholesale & retail | 2023 |
| AUM Shiv Shakti Limited | Construction | 2016 |
| AUN Property Ltd | Real estate | 2025 |
| AUR Properties Ltd | Real estate | 2024 |
| Aura AJ Ltd | Administrative & support | 2026 |
| Aurabite Limited | Hospitality | 2025 |
| Aurora.It Ltd | Information & communication | 2025 |
| Auto Market Croydon Limited | Wholesale & retail | 2000 |
| Auto Pro Garage & MOT Limited | Wholesale & retail | 2022 |
| Auto Pro Garage Limited | Wholesale & retail | 2018 |
| Auto Service and Maintenance Limited | Wholesale & retail | 2023 |
| Autoally Ltd | Information & communication | 2026 |
| Autofix Expert Repairs Ltd | Manufacturing | 2019 |
| Autopace Spares Parts Ltd | Wholesale & retail | 2025 |
| Autopart Hub Ltd | Wholesale & retail | 2022 |
| Avalon Construction (London) Ltd. | Construction | 2008 |
| Aves Housing | Real estate | 2010 |
| Aves Housing Uchc Ltd | Real estate | 2026 |
| AVI Build Ltd | Construction | 2025 |
| AVI Building Maintenance Ltd | Construction | 2023 |
| Avoncrest Limited | Real estate | 2000 |
| AVS Systems Limited | Administrative & support | 2022 |
| AW Locum Services Limited | Health & social care | 2025 |
| AW Therapeutic Services Limited | Health & social care | 2020 |
| Awan House Ltd | Wholesale & retail | 2026 |
| Awthentech Ltd | Information & communication | 2024 |
| Axon Security Services Ltd | Administrative & support | 2025 |
| Ayan Retails Ltd | Wholesale & retail | 2021 |
| Aysha Care Solutions Limited | Health & social care | 2022 |
| Ayub & Sons Ltd | Administrative & support | 2025 |
| Ayurmanthra Ltd | Health & social care | 2020 |
| Azharion Limited | Wholesale & retail | 2026 |
| Azizi Halal Meat Ltd | Wholesale & retail | 2019 |
| AZT Capital Ltd | Information & communication | 2020 |
| Azure Swim School London Limited | Arts & recreation | 2022 |
| Azy-Sop Care Limited | Real estate | 2022 |
| B House Construction Limited | Construction | 2024 |
| B&D Capital Ltd | Real estate | 2025 |
| B&K Food & Wine Ltd | Wholesale & retail | 2024 |
| B.A.C.D.L. Ltd | Construction | 2024 |
| B2B Direct Ltd | Administrative & support | 2022 |
| Baambi Beauty Ltd | Other services | 2025 |
| Babachev and Son's Moves Ltd | Transport & logistics | 2022 |
| Babeem Resources Limited | Construction | 2025 |
| Back-Up Legal Services Limited | Professional & scientific | 2016 |
| BAD BEE Ltd | Extraterritorial | 2025 |
| Baidens ARK Ltd | Agriculture & fishing | 2021 |
| Bajoos Foods Limited | Hospitality | 2025 |
| Bakers Transformation & Lettings Ltd | Real estate | 2017 |