| Aesthetics Professionals Collective CIC | Other services | 2026 |
| Aestivum Ltd | Professional & scientific | 2024 |
| Aeternum Reworked Ltd | Wholesale & retail | 2026 |
| Aeternus Security Ltd | Administrative & support | 2019 |
| AEZ Properties and Services Ltd | Real estate | 2023 |
| AF Propertied 7 Ltd | Real estate | 2025 |
| AF Snowhite Cleaning Services Ltd | Administrative & support | 2014 |
| Afaidze & Hayford Ltd | Real estate | 2021 |
| AFM Properties Ltd | Real estate | 2016 |
| Afra Logistics Ltd | Transport & logistics | 2022 |
| Aframba Services Ltd | Administrative & support | 2022 |
| Africa Enterprise Fruits and VEG Ltd | Wholesale & retail | 2020 |
| African Arts & Music Festival Limited | Information & communication | 2024 |
| African Business Round Table Ltd | Information & communication | 2019 |
| African Crossing Limited | Wholesale & retail | 2005 |
| African Startup Portfolio Ltd | Professional & scientific | 2024 |
| Afrik Entertainment Company Limited | Arts & recreation | 2013 |
| Afro Fusion Ltd | Hospitality | 2020 |
| Afro Vibez World Ltd | Arts & recreation | 2023 |
| Afromart Mini Market Ltd | Wholesale & retail | 2014 |
| Afrozantix Ltd | Information & communication | 2025 |
| After 8 Entertainment Limited | Hospitality | 2010 |
| After Dark ENT Ltd | Hospitality | 2023 |
| After Hours Entertainment Ltd | Hospitality | 2019 |
| Aftercare Home Improvements Ltd | Construction | 2025 |
| Afterglow (LDN) Ltd | Other services | 2023 |
| AG. CGM Ltd | Administrative & support | 2020 |
| AGE UK Enfield | Other services | 1997 |
| AGI Building Services Ltd | Construction | 2012 |
| Agit UK Ltd | Hospitality | 2018 |
| Agnes Rail Limited | Transport & logistics | 2021 |
| Agnital International Limited | Information & communication | 2018 |
| Agolli Group Ltd | Construction | 2024 |
| Agrico Cleaning Services Ltd | Administrative & support | 2010 |
| AGS Cooling System and Industrial Kitchen Ltd | Energy | 2023 |
| AGU J Properties Limited | Real estate | 2025 |
| Agudie Designs Ltd | Wholesale & retail | 2021 |
| Agyeman-Duah Transport Ltd | Transport & logistics | 2012 |
| AH Properties (London) Ltd | Real estate | 2012 |
| Ah&Fh Property Ltd | Real estate | 2022 |
| AHD Carpentry Limited | Other services | 2007 |
| Ahemaa MAA Ahoufie for Community Interest Company | Arts & recreation | 2023 |
| Ahiska Ltd | Wholesale & retail | 2025 |
| Ahmed EDU Connect Ltd | Education | 2026 |
| Ahmed Imperium Ltd | Real estate | 2025 |
| Ahmed Motors Limited | Wholesale & retail | 2026 |
| Ahmet Guccuk Properties Ltd | Real estate | 2024 |
| Ahmet Hair and Beauty Ltd | Other services | 2024 |
| Ahwaz Building Limited | Construction | 2023 |
| AI Consultants Partners LLP | | 2024 |
| AI Consulting Services Ltd | Professional & scientific | 2024 |
| Aica Consulting Limited | Professional & scientific | 2020 |
| Aifa Ltd | Real estate | 2006 |
| Aifin Ltd | Information & communication | 2023 |
| AIG Premium Interiors Ltd | Construction | 2026 |
| Aihu Limited | Real estate | 2018 |
| Aimatrix Limited | Education | 2017 |
| Aimbec Carpentry Ltd | Construction | 2008 |
| Aimrex Ltd | Manufacturing | 2018 |
| Aims Consultancy Limited | Professional & scientific | 2011 |
| AINE25 Ltd | Health & social care | 2025 |
| Aion Property Certificates Ltd | Professional & scientific | 2023 |
| Aipicom Limited | Professional & scientific | 2006 |
| Aira Properties Ltd | Real estate | 2017 |
| Aircraft Maintenance Support Ltd | Manufacturing | 2015 |
| Airfix Heating Cooling Ltd | Construction | 2025 |
| Airport Link Enfield Limited | Transport & logistics | 2025 |
| Airport Transfer Cars Limited | Transport & logistics | 2011 |
| Airson Consulting (UK) Ltd | Professional & scientific | 2019 |
| Aisri Ltd | Real estate | 2026 |
| Aiwu Limited | Real estate | 2018 |
| Aixi Limited | Real estate | 2014 |
| AJ Auto Sales Ltd | Wholesale & retail | 2026 |
| AJ Buna Properties Ltd | Real estate | 2021 |
| AJ Casey Ltd | Professional & scientific | 2018 |
| AJ Infiniti Ltd | Administrative & support | 2024 |
| Ajaknox Limited | Professional & scientific | 2024 |
| Ajala Group Limited | Administrative & support | 2018 |
| Ajax Properties Ltd | Real estate | 2018 |
| AJR Mechanical & Electrical Ltd | Construction | 2016 |
| AJS Brickwork Ltd | Construction | 2020 |
| AJW & Sons Limited | Wholesale & retail | 2017 |
| AJY Electrician Ltd | Construction | 2026 |
| AK & BB Ltd | Construction | 2025 |
| AK & Sons Construction Ltd | Construction | 2021 |
| AK Anime Store Ltd | Wholesale & retail | 2026 |
| AK Building for YOU Ltd | Construction | 2021 |
| AK Prime Properties Ltd | Real estate | 2025 |
| AK Residential Properties Ltd | Real estate | 2023 |
| Akasha Energy Ltd | Professional & scientific | 2026 |
| Akasya Gold Ltd | Wholesale & retail | 2025 |
| Akay Motors Limited | Wholesale & retail | 2016 |
| Akay Properties Ltd | Real estate | 2021 |
| Akayaz Ltd | Hospitality | 2019 |
| Akbu Limited | Hospitality | 2022 |
| Akdag Properties Ltd | Real estate | 2024 |
| Akdag Property Investments Ltd | Real estate | 2025 |
| Akdeniz Enfield Supermarket Limited | Wholesale & retail | 2014 |
| Akel Construction Ltd | Construction | 2021 |
| Akilinc Ltd | Hospitality | 2019 |