| Alisha Group Ltd | Real estate | 2023 |
| Alkamassonmua Ltd | Other services | 2023 |
| ALL About the Threads Ltd | Wholesale & retail | 2025 |
| ALL Paul Transport Ltd | Transport & logistics | 2024 |
| ALL Season Events Limited | Hospitality | 2019 |
| ALL Services London 18 Ltd | Wholesale & retail | 2023 |
| ALL Types of Stitching Ltd | Other services | 2023 |
| ALL Your Properties Ltd | Real estate | 2023 |
| All-In-One Global Consultancy Ltd | Education | 2024 |
| All-Time Convenience Ltd | Wholesale & retail | 2019 |
| Allcleanclear Ltd | Manufacturing | 2025 |
| Alldira Limited | Administrative & support | 2018 |
| Allegiance Mobility Group Ltd | Administrative & support | 2024 |
| Allen Cooper Construction Ltd | Construction | 2018 |
| Allforcar Ltd | Wholesale & retail | 2021 |
| Alliance @ Solutions Limited | Hospitality | 2016 |
| Alliance Car Care Ltd | Wholesale & retail | 2025 |
| Alliance GSR Ltd | Other services | 2023 |
| Allied Materials Ltd | Manufacturing | 2025 |
| Allou Barbers Ltd | Other services | 2025 |
| Alloy K Automotive Ltd | Wholesale & retail | 2026 |
| Allpro Roofing Ltd | Construction | 2026 |
| Allstar Real Estate Ltd | Real estate | 2018 |
| ALLTICKETS4U Ltd | Arts & recreation | 2025 |
| Alltimecarpets Limited | Construction | 2025 |
| Allurehairandbeauty Limited | Other services | 2021 |
| ALM Property Management Ltd | Real estate | 2024 |
| Alminta Ltd | Wholesale & retail | 2009 |
| Alminta Sun Ltd | Other services | 2014 |
| Alnoor Property Management Ltd | Real estate | 2018 |
| Aloro Limited | Wholesale & retail | 2025 |
| Aloy Constructs Ltd | Construction | 2024 |
| ALP NET Cover Ltd | Wholesale & retail | 2025 |
| Alpasha Limited | Hospitality | 2022 |
| Alpha Electrical Contractor Ltd | Construction | 2013 |
| Alpha Elite Holdings Limited | Real estate | 2025 |
| Alpha Food Company Ltd | Wholesale & retail | 2021 |
| Alpha Global Partners Ltd. | Financial services | 2023 |
| Alpha Global Research Ltd | Information & communication | 2023 |
| Alpha Intelligence Ltd | Professional & scientific | 2016 |
| Alpha Medical Services Ltd | Health & social care | 2008 |
| Alpha Personnel and Training Ltd | Administrative & support | 2015 |
| Alpha Shine Decorators Ltd | Construction | 2025 |
| Alpha Web Creators Ltd | Information & communication | 2025 |
| Alphaa Homes Ltd | Real estate | 2021 |
| Alphapro Removals Ltd | Transport & logistics | 2018 |
| Alpine Investments Limited | Real estate | 2017 |
| Alpine Trade Limited | Wholesale & retail | 2022 |
| Alps Biosciences Limited | Manufacturing | 2017 |
| Alps IT Consultancy Limited | Information & communication | 2013 |
| Alsafah and Almarwah Catering and Foods Supply Company Ltd | Hospitality | 2023 |
| ALT Infotech Limited | Information & communication | 2008 |
| Alt-Delta Datalytics Ltd | Information & communication | 2023 |
| Altap Associates Ltd | Real estate | 2025 |
| Altas Orchard Ltd | Real estate | 2025 |
| Alton Flooring Ltd | Wholesale & retail | 2015 |
| Altos Property Limited | Real estate | 2021 |
| Alunak Limited | Wholesale & retail | 2025 |
| Always Available Healthcare Limited | Administrative & support | 2025 |
| Always Help in Hand Limited | Health & social care | 2009 |
| Alynet Ltd | Information & communication | 2025 |
| Alyra Energy Solution Ltd | Real estate | 2025 |
| Alyusra Travel Ltd | Administrative & support | 2015 |
| AM Barbershop Ltd | Other services | 2025 |
| AM Caterers Ltd | Wholesale & retail | 2022 |
| AM Medicare Services Ltd | Health & social care | 2010 |
| AM Mini CAB Services Limited | Transport & logistics | 2017 |
| AM Outsourcing Limited | Other services | 2015 |
| AM Square Properties Ltd | Real estate | 2024 |
| AM2PM Logistics Ltd | Transport & logistics | 2023 |
| AMA Load Connection Ltd | Transport & logistics | 2025 |
| Amaarco Limited | Wholesale & retail | 2019 |
| Amadeus Hospitality UK Limited | Information & communication | 1998 |
| Amal Amini Ltd | Extraterritorial | 2025 |
| Aman News Limited | Wholesale & retail | 2010 |
| Amanat Courier Ltd | Transport & logistics | 2023 |
| Amandeep Convenience Store Ltd | Wholesale & retail | 2017 |
| Amanzada Perfumes UK Ltd | Wholesale & retail | 2026 |
| Amar Droch Construction Limited | Construction | 2024 |
| Amar Property Limited | Real estate | 2020 |
| Amarani Ltd | Real estate | 2021 |
| Amaris Private Ltd | Wholesale & retail | 2026 |
| Amarisah Beauty Ltd | Wholesale & retail | 2025 |
| Amarjeet Construction Ltd | Construction | 2019 |
| Amarjot Singh Ltd | Construction | 2025 |
| Amayah Hair & Beauty Ltd | Other services | 2025 |
| Amazing Consulting (UK) Ltd | Professional & scientific | 2013 |
| Amazon Shop Seller Limited | Wholesale & retail | 2025 |
| Amazon Ventures (UK) Limited | Extraterritorial | 2001 |
| Ambati Ltd | Professional & scientific | 2026 |
| Amber Childcare Services Ltd | Health & social care | 2020 |
| Amber Security Services and Systems Ltd | Construction | 2023 |
| Amber Training Advisory & Support Services Ltd | Administrative & support | 2008 |
| AMBER1313 Limited | Transport & logistics | 2025 |
| Amberfly Ltd | Administrative & support | 2020 |
| Ambi INV Ltd | Construction | 2017 |
| Ambi London Ltd | Professional & scientific | 2024 |
| Ambiance Beauty Limited | Other services | 2024 |
| Ambiance Hair Limited | Other services | 2024 |
| Ambik Construction Ltd | Construction | 2025 |