| Adesiyan.Com Limited | Information & communication | 2019 |
| Adewuyi Ltd | Professional & scientific | 2014 |
| ADK Heaithcare Servlces Ltd | Agriculture & fishing | 2022 |
| ADK Healthcare Services Ltd | Administrative & support | 2021 |
| ADM Milling Limited | Manufacturing | 1989 |
| Adonna Property Management Ltd | Real estate | 2023 |
| ADS and Translations Ltd | Professional & scientific | 2026 |
| Adtech Total Security Ltd. | Administrative & support | 2018 |
| Adura Entertainment & Services Ltd | Arts & recreation | 2023 |
| Aduralere Holdings Ltd | Financial services | 2026 |
| Advanced GAS Ltd | Construction | 2010 |
| Aeaa Limited | Administrative & support | 2017 |
| Aegis Solutions Limited | Information & communication | 2022 |
| AF3N Limited | Real estate | 2025 |
| Affinity Learn Limited | Education | 2024 |
| Afimansa Limited | Health & social care | 2022 |
| Afunkie Beauty Ltd | Wholesale & retail | 2018 |
| Afyrmativ Ltd | Transport & logistics | 2017 |
| Agenda Football Club Limited | Arts & recreation | 2025 |
| Agges Limited | Real estate | 2021 |
| Agilesynergy Group Limited | Information & communication | 2024 |
| Agimed Plus Care Ltd | Health & social care | 2025 |
| Aglory Merchant Enterprises Limited | Wholesale & retail | 2004 |
| Agorami Care Solutions Ltd | Health & social care | 2025 |
| Agri Rivers Limited | Information & communication | 2022 |
| Agrochem Solutions Limited | Manufacturing | 2025 |
| Ahmet Property Investments Ltd | Construction | 2026 |
| AI Lv&Hv Cable Installation Ltd | Construction | 2019 |
| AI1PNS Ltd | Other services | 2025 |
| Aiforwarder Ltd | Transport & logistics | 2026 |
| AIK Services Limited | Other services | 2016 |
| Ailles Landscaping Ltd | Administrative & support | 2011 |
| AIP Financial Services Limited | Financial services | 2018 |
| Airnet Solution Limited | Administrative & support | 2014 |
| Aishow Consulting Ltd | Professional & scientific | 2023 |
| AJ 53 Logistics Limited | Transport & logistics | 2025 |
| AJ Digital Management Ltd | Information & communication | 2019 |
| AJ Floor Care Limited | Construction | 2019 |
| AJ Fried Chicken Ltd | Hospitality | 2024 |
| AJ Green Energy Solutions Ltd | Construction | 2023 |
| Ajamu and Co Ltd | Administrative & support | 2020 |
| AK Convenient Solutions Ltd | Manufacturing | 2019 |
| Akaal Contracting Limited | Financial services | 2021 |
| Akaal Group Limited | Professional & scientific | 2006 |
| Akaal Properties Limited | Financial services | 2021 |
| Akalaa Ltd | Wholesale & retail | 2018 |
| Akinjegs Investments Limited | Real estate | 2021 |
| Akinstiling Ltd | Construction | 2020 |
| AKK Crown Ltd | Transport & logistics | 2025 |
| Akme Tuition Limited | Professional & scientific | 2018 |
| AL Akhtar Limited | Information & communication | 2025 |
| AL Restoration Ltd | Manufacturing | 2026 |
| Alanage Limited | Wholesale & retail | 2013 |
| Alaso Limited | Health & social care | 2013 |
| Alder Close Limited | Real estate | 2007 |
| Aldex Group Ltd | Construction | 2016 |
| Aleng General Consultants & Services Ltd | Construction | 2014 |
| Alex D& D Training Limited | Education | 2017 |
| Alex Moss Media Ltd | Professional & scientific | 2021 |
| Alexandria Baderin Limited | Wholesale & retail | 2019 |
| Alexandru Cristian Zamfir Ltd | Transport & logistics | 2026 |
| Aliciachanel Care Limited | Health & social care | 2013 |
| ALL About Couples Limited | Hospitality | 2022 |
| ALL in One Building and Maintenance Ltd | Construction | 2021 |
| ALL Scrap Metal South London Ltd | Other services | 2025 |
| ALL Seasons Services Ltd | Administrative & support | 2024 |
| ALL Window Services Ltd | Construction | 2003 |
| ALL Year Property Care Limited | Real estate | 2025 |
| Allaboutthebump Ltd | Wholesale & retail | 2016 |
| Allied Commercial Properties Limited | Real estate | 2007 |
| Allied Hygiene Systems Limited | Manufacturing | 1990 |
| Alliedsure Ltd | Professional & scientific | 2015 |
| Alloway Promotions Limited | Professional & scientific | 2025 |
| Alltypebuilding Ltd | Construction | 2024 |
| Aloine Security Ltd | Construction | 2020 |
| Alomar (U.K.) Limited | Transport & logistics | 1980 |
| Alomeg Allied Services Ltd | Health & social care | 2012 |
| Alpha & Akira Ltd | Wholesale & retail | 2022 |
| Alpha Links Securities Limited | Administrative & support | 2016 |
| Alpha Steps Childcare Ltd | Health & social care | 2026 |
| Alpha-Tec Party Wall Surveyors Ltd | Professional & scientific | 2019 |
| ALPHA90 Ltd | Administrative & support | 2025 |
| Alphaserv Hospitality Ltd | Hospitality | 2025 |
| Alsanti Limited | Administrative & support | 2025 |
| Altair Homes Ltd | Real estate | 2025 |
| Altra Verba Ltd | Professional & scientific | 2025 |
| Alwdo Assist Ltd | Health & social care | 2019 |
| AMA & Datum Limited | Health & social care | 2009 |
| Amafi Limited | Professional & scientific | 2026 |
| Amandeep Builder Limited | Construction | 2025 |
| Amandeep Ltd | Administrative & support | 2021 |
| Amaryllis Apartments Ltd | Hospitality | 2021 |
| Amax IT Solutions (UK) Ltd | Information & communication | 2024 |
| Amay Trading Limited | Wholesale & retail | 2021 |
| AMB International Limited | Professional & scientific | 2020 |
| AMC Estate Services Ltd | Construction | 2025 |
| Amese's Kitchen Limited | Hospitality | 2019 |
| Ami&Ami Limited | Health & social care | 2018 |
| AMK Distribution Ltd | Wholesale & retail | 2016 |
| Amodu Brothers Autocare Limited | Wholesale & retail | 2021 |