| 12 Mary Street Management Company Limited | Households | 2012 |
| 14624 Limited | Professional & scientific | 2000 |
| 164 Limited | Professional & scientific | 2010 |
| 230 Electrical Engineers & Contractors Ltd | Real estate | 2008 |
| 3-1 Endurance Ltd | Education | 2023 |
| 34 Mary Street Management Company Limited | Real estate | 2014 |
| 360 Health & Fitness Therapy Limited | Other services | 2013 |
| 4D (UK) Limited | Professional & scientific | 2014 |
| 4SUN Limited | Wholesale & retail | 2025 |
| 55 Esplanade Avenue Management Company Limited | Real estate | 2015 |
| 76 Mackworth Road Ltd | Households | 2020 |
| 87-89 New Road Management Company Limited | Households | 2019 |
| A C Aviation Ltd | Manufacturing | 2024 |
| A J Guttridge Ltd | Wholesale & retail | 2006 |
| A Modern Energy Ltd | Construction | 2014 |
| A. Ferraris Limited | Professional & scientific | 2008 |
| AAS Chicken Ltd | Hospitality | 2024 |
| AAW Aircraft Maintenence Ltd | Manufacturing | 2025 |
| AB Engineering Consultants Ltd | Professional & scientific | 2024 |
| Abbi Engineering Limited | Manufacturing | 2023 |
| Aberystwyth Investments Limited | Extraterritorial | 2016 |
| ABM Aerotech Ltd | Manufacturing | 2019 |
| Aboody's Company Ltd | Wholesale & retail | 2018 |
| Aburvanirmalan PVT Ltd | Wholesale & retail | 2024 |
| Accessincworld Ltd | Administrative & support | 2025 |
| Ace Social Work Ltd | Health & social care | 2018 |
| Acerod Aircraft Engineering Limited | Manufacturing | 2021 |
| Adele Morris Photography Limited | Professional & scientific | 2019 |
| ADW2016 Ltd | Manufacturing | 2016 |
| Aerorail Ltd | Manufacturing | 2022 |
| Aerospace Anti Corrosion Solutions Limited | Manufacturing | 2019 |
| Aersoft Aviation Solutions Limited | Manufacturing | 2025 |
| AG Plastikos Limited | Wholesale & retail | 2011 |
| Agawise Ltd | Other services | 2013 |
| AH Aerotech Limited | Manufacturing | 2016 |
| AH Aviation Limited | Manufacturing | 2017 |
| Ails Ltd | Professional & scientific | 2016 |
| Airauto Ltd | Other services | 2016 |
| Aircraft Modification Solutions Limited | Manufacturing | 2024 |
| Aircraft Technical Support Limited | Manufacturing | 2017 |
| Airmax Aviation Limited | Manufacturing | 2019 |
| ALE Pubs Limited | Hospitality | 2024 |
| Ali's Barber 86 Ltd | Other services | 2025 |
| Aljamry Engineering Limited | Manufacturing | 2022 |
| ALL Aspects Engineering Ltd | Manufacturing | 2022 |
| Alphabash Ltd | Health & social care | 2024 |
| Alphaclean Autocare Limited | Administrative & support | 2005 |
| AM Technical Ltd | Manufacturing | 2023 |
| Amelia Aerotech Limited | Manufacturing | 2013 |
| And-C Consulting Limited | Real estate | 2018 |
| Anglo Arabian Metals Limited | Wholesale & retail | 2013 |
| Anza Entrepreneurs Limited | Health & social care | 2009 |
| AOG Aero Solutions Limited | Manufacturing | 2016 |
| APC Aviation Limited | Manufacturing | 2016 |
| APS Bushell Limited | Administrative & support | 2014 |
| APS Heiling Limited | Professional & scientific | 2009 |
| Archstone Masonry Ltd | Construction | 2023 |
| Arlanymor Ltd | Real estate | 2015 |
| Arthur Beale and Family Ltd | Administrative & support | 2021 |
| Arytir Limited | Agriculture & fishing | 2019 |
| ASH Aerospace Limited | Administrative & support | 2011 |
| ASK4SKIPS Limited | Water & waste | 2019 |
| Askew Aviation Limited | Transport & logistics | 2018 |
| Askforacar Ltd | Wholesale & retail | 2022 |
| Associated Financial Leasing Limited | Transport & logistics | 2009 |
| Associated Wellbeing Holdings Limited | Financial services | 2025 |
| Associated Wellbeing Property Holdings Limited | Financial services | 2025 |
| Astera Energy Ltd | Professional & scientific | 2023 |
| Astera Group Limited | Professional & scientific | 2026 |
| Astera Minerals Limited | Professional & scientific | 2023 |
| AT Props Limited | Transport & logistics | 2017 |
| ATM Technical Solutions Limited | Manufacturing | 2025 |
| Atmos Properties Limited | Real estate | 2021 |
| Audio Fiction Ltd | Information & communication | 2021 |
| Austin Wall Ltd | Construction | 2024 |
| Autobarnes of Wales Limited | Wholesale & retail | 2008 |
| Autside Limited | Professional & scientific | 2023 |
| Avenue Property Management & Lettings Ltd | Real estate | 2020 |
| Avocation Limited | Professional & scientific | 2003 |
| Avocation Trading Ltd | Wholesale & retail | 2017 |
| AWG Consult Ltd | Professional & scientific | 2023 |
| AWH Consulting Ltd | Information & communication | 2005 |
| B G Bolan Limited | Professional & scientific | 2021 |
| B.Fulgoni & Sons Limited | Manufacturing | 1962 |
| Balsa Surf Ltd | Wholesale & retail | 2022 |
| Bark Mill Limited | Real estate | 2013 |
| Bart Gilbert Ltd | Wholesale & retail | 2009 |
| Barwales Ltd | Hospitality | 2026 |
| Battrick Properties Limited | Real estate | 2015 |
| Bay Hairdressing Co Porthcawl Ltd | Other services | 2025 |
| Bay Property Maintenance Limited | Construction | 2010 |
| Bdaviesengineering Ltd | Manufacturing | 2022 |
| BEN Ellis MMA Limited | Arts & recreation | 2022 |
| BEN Hapgood Plumbing Services Ltd. | Construction | 2018 |
| Bentley Analytics Limited | Professional & scientific | 2019 |
| Bespoke Carbon Solutions Limited | Manufacturing | 2014 |
| BID Directors Limited | Professional & scientific | 2008 |
| Big Beach Holdings Ltd | Financial services | 2026 |
| Birdie Golf Porthcawl Ltd | Wholesale & retail | 2025 |
| Birds Original Ltd | Wholesale & retail | 2018 |