| 0XCODE Ltd | Information & communication | 2024 |
| 100X Ltd | Wholesale & retail | 2023 |
| 131 Films Production Limited | Information & communication | 2023 |
| 1POINT3ACADEMY Ltd | Education | 2023 |
| 1POINT4 Ltd | Information & communication | 2004 |
| 3 KY Developments Ltd | Construction | 2019 |
| 3689 Ltd | Administrative & support | 2022 |
| 4LBA Ltd | Transport & logistics | 2023 |
| 55NORD Ltd | Information & communication | 2013 |
| 770 Limited | Manufacturing | 2020 |
| 7AM Limited | Information & communication | 2009 |
| 7D Logistics Management Ltd | Other services | 2025 |
| 8 Rosary Gardens Limited | Real estate | 2014 |
| A James Building Ltd | Construction | 2023 |
| A Plus ENT Ltd | Manufacturing | 2022 |
| A-Lab Software Limited | Information & communication | 2007 |
| A3 Studio Ltd | Professional & scientific | 2025 |
| AA Ventures Group Ltd | Other services | 2021 |
| Aafiyah Digital Ltd | Wholesale & retail | 2024 |
| Abraham Elite Ltd | Mining & quarrying | 2023 |
| ACM Subsea Limited | Professional & scientific | 2025 |
| Across the Pond Limited | Information & communication | 2025 |
| Acuconnect Ltd | Information & communication | 2020 |
| Acumen Global Partners Limited | Administrative & support | 2009 |
| Adam J Tovey Ltd | Financial services | 2023 |
| Adapt Home Enhancements Ltd | Construction | 2024 |
| Addlist Limited | Administrative & support | 2021 |
| Adrian Green Design Ltd | Professional & scientific | 2011 |
| Aegon Games Ltd | Information & communication | 2016 |
| Aether Wholesale Ltd | Wholesale & retail | 2025 |
| Aetherbloom Ltd | Administrative & support | 2025 |
| Afirmotive Ltd | Professional & scientific | 2017 |
| Africaoracle Ltd | Information & communication | 2014 |
| Agora Software Ltd | Information & communication | 2024 |
| Ahaoma Group Limited | Wholesale & retail | 2023 |
| Ahmed EID Mohamed Eleshar for Engineering Consultations Ltd | Professional & scientific | 2025 |
| AIM to Scale Limited | Professional & scientific | 2025 |
| Alameda DE Hercules Limited | Wholesale & retail | 2020 |
| Alby Consulting Ltd | Professional & scientific | 2022 |
| Alchemy Worldwide Limited | Professional & scientific | 2016 |
| ALL Projects Ltd | Construction | 2018 |
| Alliance Eras Limited | Wholesale & retail | 2002 |
| Almz Bright Ltd | Wholesale & retail | 2021 |
| Amazzing Touch Services Limited | Health & social care | 2022 |
| Amesiy Limited | Construction | 2023 |
| AMJ Paint Limited | Wholesale & retail | 2013 |
| AML Dealcheck Limited | Information & communication | 2024 |
| Ancor Place Limited | Real estate | 2025 |
| Ann's Property Services Ltd | Households | 2023 |
| Anparo Limited | Construction | 2018 |
| AO Go Ltd | Wholesale & retail | 2022 |
| Apartmentsforyou Ltd | Real estate | 2022 |
| Apex Enterprise Solutions Ltd | Professional & scientific | 2013 |
| Appsy Software Ltd | Information & communication | 2025 |
| Aquinas Law Limited | Professional & scientific | 2016 |
| Aquincum Capital Ltd | Construction | 2021 |
| Araceli's Limited | Hospitality | 2015 |
| Arcana Media Ltd | Professional & scientific | 2021 |
| Ardington School of Crafts Ltd | Education | 2011 |
| Arlco Limited | Other services | 2023 |
| Armium Ltd | Professional & scientific | 2024 |
| Arqiz Ltd | Wholesale & retail | 2022 |
| Arthropharm (Europe) Limited | Wholesale & retail | 1993 |
| Artizun Ltd | Wholesale & retail | 2025 |
| AS Capital Solutions Ltd | Wholesale & retail | 2024 |
| Asara DEE Group Ltd | Professional & scientific | 2023 |
| Asia Europe Equity Limited | Professional & scientific | 2021 |
| ASK Initiative Ltd | Health & social care | 2020 |
| Association of British Orchestras(The) | Other services | 1984 |
| Astraeus Technology Limited | Information & communication | 2023 |
| Atlas Environmental Partners Limited | Professional & scientific | 2025 |
| Atlas Vision Innovations Limited | Information & communication | 2023 |
| ATM Property Group Ltd | Real estate | 2022 |
| Atrium Group Limited | Construction | 2018 |
| Aurora MBA | Information & communication | 2022 |
| Autodesign Studio Ltd | Wholesale & retail | 2018 |
| Automotive World Limited | Information & communication | 2001 |
| Aydee's Ice Cream Ltd | Manufacturing | 2025 |
| Ayoub Latreche Ltd | Information & communication | 2025 |
| AZ Bookkeeping Ltd | Professional & scientific | 2018 |
| Azure Worldwide Recycling Limited | Professional & scientific | 2022 |
| Aéto Group Limited | Professional & scientific | 2024 |
| Aéto Ventures Limited | Financial services | 2025 |
| Back Harmony Pilates CIC | Health & social care | 2024 |
| Balloon Property Group Limited | Real estate | 2025 |
| Bastion Security Management Ltd | Administrative & support | 2025 |
| Bazie Mortgage and Financial Services Limited | Financial services | 2016 |
| Beautiful Places AI Technologies Ltd | Information & communication | 2025 |
| Behr-Cardiology Limited | Health & social care | 2021 |
| Being Commons Ltd | Other services | 2024 |
| Beneficial House (Birmingham) Regeneration LLP | | 2013 |
| Better Century C.I.C. | Administrative & support | 2017 |
| Better Venture Productions Ltd | Administrative & support | 2022 |
| Beverley Mechanical Services Ltd | Construction | 2022 |
| Bexley Swimming Club Limited | Arts & recreation | 2014 |
| Bibevie Ltd | Wholesale & retail | 2020 |
| Bimmetric Ltd | Information & communication | 2025 |
| Birch Developments Limited | Construction | 2018 |
| Bitmedia Ltd | Information & communication | 2015 |
| Black Deuce Limited | Professional & scientific | 2021 |