| Akinyemi Consulting Limited | Information & communication | 2013 |
| Akkub Project Consultants Limited | Professional & scientific | 2019 |
| Akkurt Ltd | Wholesale & retail | 2025 |
| AKM Computer Limited | Information & communication | 2019 |
| AKM Printing and Packaging UK Ltd | Administrative & support | 2023 |
| AKP Property Solutions Ltd | Construction | 2026 |
| Akpinar Properties Ltd | Real estate | 2017 |
| Akra Home Interiors Limited | Wholesale & retail | 2006 |
| Aksian Ltd | Real estate | 2015 |
| Aksoy Trading Ltd | Wholesale & retail | 2022 |
| Aksu Properties Ltd | Real estate | 2021 |
| Aktt Ltd | Professional & scientific | 2015 |
| Akuba Limited | Wholesale & retail | 2020 |
| Akvemtek Engineering and Valve Ltd | Manufacturing | 2023 |
| Akwaaba Hire Ltd | Other services | 2019 |
| Akyol Catering Ltd | Hospitality | 2021 |
| Akyol Law Ltd | Professional & scientific | 2018 |
| AL Family Properties Limited | Real estate | 2025 |
| AL Hashim Vakif UK Ltd | Health & social care | 2021 |
| AL Shumookh UK Company for OIL & Energy Services Ltd | Mining & quarrying | 2024 |
| Alabar Fusion Ltd | Hospitality | 2024 |
| Alan Booth Associates Limited | | 1981 |
| Alan Booth Commissioning Limited | Professional & scientific | 2013 |
| Alan Hairdressing Ltd | Other services | 2018 |
| Alan Hannah Limited | Manufacturing | 1999 |
| Alan Lancaster Limited | Construction | 2003 |
| Alan Scaffolding Services Ltd | Construction | 2025 |
| Alaya Court Freehold Limited | Real estate | 2022 |
| ALB Construction Ltd | Construction | 2019 |
| ALB Painters & Decorators Ltd | Construction | 2015 |
| ALB007 Ltd | Construction | 2026 |
| Alba Stone Limited | Manufacturing | 2007 |
| Albany Construction Ltd | Construction | 2016 |
| Albany Landscapes Ltd | Administrative & support | 2016 |
| Albany Radio (Enfield) Limited | Wholesale & retail | 1981 |
| Albany Reactive Services Ltd | Construction | 2014 |
| Albany Tandoori Ltd | Hospitality | 2025 |
| Albatross Logistics Limited | Transport & logistics | 2024 |
| Albeity Limited | Real estate | 2018 |
| Albeity Management Limited | Real estate | 2018 |
| Albemarle Club Ltd | Hospitality | 2012 |
| Albert RD Estates Ltd | Other services | 2018 |
| Albhena Srevices Ltd | Administrative & support | 2026 |
| Albion Participacoes, Investimentos E Aluguel DE Bens Proprios Ltd. | Real estate | 2004 |
| Albion Property Holding Limited | Real estate | 2026 |
| Alblofts Ltd | Construction | 2011 |
| Albo Trades Ltd | Construction | 2026 |
| Albor Cleaning Ltd | Administrative & support | 2026 |
| Alboss Consulting Limited | Information & communication | 2022 |
| Albukitchens Limited | Construction | 2023 |
| Albury Repair Works Limited | Wholesale & retail | 2011 |
| Albylis Stone Ltd | Wholesale & retail | 2025 |
| Alcare Ltd | Real estate | 2019 |
| Alcr Ltd | Professional & scientific | 2022 |
| Alden Medical Services Ltd | Health & social care | 2022 |
| Aldgate Recruitment Limited | Administrative & support | 2025 |
| Aldis Construction Ltd | Construction | 2024 |
| Aldo Services Limited | Professional & scientific | 1998 |
| Alee Consultancy Ltd | Transport & logistics | 2019 |
| Alegna Services Ltd | Administrative & support | 2018 |
| ALEKSI238 Ltd | Transport & logistics | 2023 |
| Alemura Limited | Wholesale & retail | 2016 |
| Alendos Consulting Limited | Professional & scientific | 2026 |
| Alestro Build Ltd | Construction | 2025 |
| Alex & Frani Property Ltd | Real estate | 2024 |
| Alex Marc Associates Limited | Professional & scientific | 2021 |
| Alex Motor Repair Ltd | Wholesale & retail | 2022 |
| Alex Stephen Mcdonald Ltd | Information & communication | 2025 |
| Alexander JAY Consulting Ltd | Information & communication | 2018 |
| Alexander Locksmith & Property Services Ltd | Real estate | 2025 |
| Alexandra Michael Ltd | Real estate | 2019 |
| Alexandre Gueorguiev Ltd | Transport & logistics | 2021 |
| Alexia’S Automobiles Limited | Wholesale & retail | 2025 |
| Alexio Trans Ltd | Transport & logistics | 2017 |
| Alfa Force Cleaner UK Ltd | Administrative & support | 2023 |
| Alfa IT Recruitment Ltd | Administrative & support | 2010 |
| Alfie Resell and Clean Ltd | Wholesale & retail | 2025 |
| Alfred James 24/7 Ltd | Professional & scientific | 2026 |
| Algebrainthecity Ltd | Education | 2018 |
| Algoritman Ltd | Wholesale & retail | 2025 |
| Alhamd School Limited | Education | 2025 |
| Alhomes Limited | Real estate | 2019 |
| ALI Barber Leek Limited | Other services | 2023 |
| ALI Barbers (Franchise) Ltd | Professional & scientific | 2022 |
| ALI Barbers Holdings Ltd | Financial services | 2020 |
| ALI Deniz Defne Ltd | Wholesale & retail | 2021 |
| ALI Zara Limited | Administrative & support | 2017 |
| Ali&Son Investment Ltd | Real estate | 2020 |
| Ali's Driving School Ltd | Education | 2026 |
| Alican Properties Ltd | Real estate | 2026 |
| Alici Beauty Limited | Other services | 2023 |
| Aliciah Bernard Ltd | Other services | 2025 |
| ALIENS89 Ltd | Transport & logistics | 2016 |
| Aligas Plumbing & Heating Ltd | Construction | 2019 |
| Alija Heating and Electrics Ltd | Construction | 2025 |
| Alika Builders Ltd | Construction | 2022 |
| Aliza’S Hair and Beauty Ltd | Wholesale & retail | 2019 |
| Aliza’S Hair Ltd | Manufacturing | 2019 |
| Ali’S Auto & Tyres Ltd | Wholesale & retail | 2024 |
| Ali’Z Motor Limited | Wholesale & retail | 2020 |