| Adelaide Green Limited | Real estate | 2015 |
| Ademar Italian Limited | Hospitality | 2025 |
| Adept Finance Limited | Financial services | 2021 |
| Adept Property & Developments Ltd | Real estate | 2023 |
| Adesire Ecommerce Limited | Wholesale & retail | 2026 |
| Adgrand Ltd | Financial services | 2023 |
| Adgrand Pro Ltd | Construction | 2019 |
| Adgrand Properties Ltd | Real estate | 2025 |
| ADI Digital Hub Ltd | Information & communication | 2025 |
| ADI Solutions Ltd | Information & communication | 2024 |
| Adichi Ltd | Wholesale & retail | 2018 |
| Adichi Technolab Ltd | Information & communication | 2023 |
| Adisonbro Global Ltd | Construction | 2024 |
| Adisonbro Limited | Construction | 2017 |
| Adisonbro Properties Limited | Real estate | 2021 |
| Adle Properties Limited | Real estate | 2020 |
| Adma Living Ltd | Real estate | 2025 |
| Admi Construct Ltd | Construction | 2024 |
| Adnak Property Company Limited | Construction | 2023 |
| Adnr Group Limited | Real estate | 2025 |
| Adomba Properties Ltd | Real estate | 2025 |
| Adomba Solutions Limited | Administrative & support | 2024 |
| Adov Limited | Real estate | 2016 |
| Adri Roofing Ltd | Construction | 2022 |
| Adrian E. Creanga Ltd | Construction | 2018 |
| Adtalent Limited | Administrative & support | 2018 |
| Advance Cash Register Limited | Information & communication | 1975 |
| Advance Electrical Property Maintenance Limited | Construction | 2024 |
| Advanced in Design Ltd | Real estate | 2014 |
| Advantage Personal Training Ltd | Other services | 2022 |
| Advantage Woman Limited | Extraterritorial | 2013 |
| Adventuresinto Ltd | Education | 2014 |
| ADVICE4DRIVERS Ltd | Professional & scientific | 2020 |
| ADVICE4YOU Ltd | Professional & scientific | 2018 |
| Adwodent Ltd | Health & social care | 2025 |
| AEC Facilities Limited | Construction | 2018 |
| AEE Privileged Accounting Ltd | Professional & scientific | 2025 |
| AEE Privileged Ltd | Wholesale & retail | 2016 |
| AEE Property Limited | Real estate | 2016 |
| AEI Ltd | Real estate | 2024 |
| Aerin Limited | Hospitality | 2023 |
| Aerison Limited | Wholesale & retail | 2025 |
| Aestcom Limited | Health & social care | 2006 |
| Aesthetic on Demand Ltd | Other services | 2019 |
| Aesthetics and Beauty by Fleurebleue Limited | Other services | 2025 |
| Aether Automotive Ltd | Wholesale & retail | 2013 |
| Aezr Group Limited | Wholesale & retail | 2025 |
| AF Breahna Ltd | Administrative & support | 2018 |
| Afbuk Ltd | Professional & scientific | 2025 |
| AFC Dunstable Limited | Hospitality | 2022 |
| Affinity Bureau Ltd | Financial services | 2021 |
| African Bush Camps Limited | Administrative & support | 2005 |
| African Natural Produce Wholesalers Ltd | Wholesale & retail | 2020 |
| AG Decorators Ltd | Construction | 2023 |
| AGB Sales & Marketing Limited | Professional & scientific | 2005 |
| AGC Demolition Limited | Construction | 2019 |
| AGC Scaffolding Limited | Construction | 2022 |
| Agha Property Investment Ltd | Real estate | 2026 |
| Agilewow Ltd | Information & communication | 2022 |
| AGL Catering Services Ltd | Administrative & support | 2016 |
| Agnes & MO Ltd | Construction | 2018 |
| AGR Enterprise Limited | Wholesale & retail | 2025 |
| AGR Model Railway Store Ltd | Wholesale & retail | 2014 |
| AGS Telecommunications Ltd | Information & communication | 2021 |
| Agup Ltd | Professional & scientific | 2022 |
| AH Golden Limited | Wholesale & retail | 2019 |
| AH1 Builders Ltd | Construction | 2023 |
| AI Carcare Ltd | Wholesale & retail | 2025 |
| AI Electrical Services Ltd | Construction | 2021 |
| AI Motoring Group Ltd | Wholesale & retail | 2021 |
| AI MTD Solutions Limited | Information & communication | 2026 |
| Aiden Retail Ltd | Wholesale & retail | 2017 |
| Aipoze Ltd | Information & communication | 2025 |
| Air Compressors Direct Limited | Manufacturing | 2015 |
| Air Conditioning & Smart Energy Solutions Ltd | Construction | 2022 |
| Air Technique Bedford Limited | Administrative & support | 2010 |
| Aircraft Seat Ltd | Manufacturing | 2018 |
| Airinstall (U.K) Ltd | Construction | 2021 |
| Airinstall Limited | Construction | 2014 |
| Aisha B Limited | Wholesale & retail | 2019 |
| AIT Technologies Ltd | Information & communication | 2025 |
| Aitken Rail Services Ltd | Manufacturing | 2019 |
| Aiza Estates Limited | Real estate | 2018 |
| Aizan Properties Ltd | Real estate | 2025 |
| AJ Heating Solutions Limited | Construction | 2026 |
| AJ Pharma Consultancy Limited | Wholesale & retail | 2025 |
| Ajdb Solutions Limited | Information & communication | 2018 |
| AJG Plumbing and Heating Ltd | Construction | 2024 |
| AJH Hairdressing Ltd | Other services | 2020 |
| Ajj's Nurseries Ltd | Education | 2011 |
| AJN Maintenance Ltd | Construction | 2019 |
| AJP Autovalet Limited | Wholesale & retail | 2014 |
| AK Assets 1 Limited | Real estate | 2022 |
| AK Assets 2 Limited | Real estate | 2025 |
| AK Assets Holdings Limited | Real estate | 2023 |
| AK Assets Limited | Real estate | 2014 |
| AK Assets London Ltd | Real estate | 2020 |
| AK Business Consultant Limited | Real estate | 2018 |
| AK Herts Limited | Real estate | 2026 |
| AK2025 Holding Limited | Financial services | 2025 |