| Afishal Productions Limited | Extraterritorial | 2021 |
| Afpa Trust Ltd | Other services | 2013 |
| Africa Travel Exchange Ltd | Information & communication | 2024 |
| African Emporium Ltd | Health & social care | 2022 |
| African Marketing Agency Ltd | Information & communication | 2024 |
| Afrigrowth Bridge Limited | Professional & scientific | 2025 |
| Afro Hair, Beauty & Cosmetics Ltd | Wholesale & retail | 2025 |
| Afrolursh Limited | Other services | 2024 |
| Aftermath Collections Limited | Financial services | 2012 |
| AG Holdings Ltd | Real estate | 2025 |
| AG PR Limited | Professional & scientific | 2010 |
| Agace Brothers Roofing Limited | Construction | 2015 |
| AGC System Scaffolding Limited | Construction | 2010 |
| AGE Concern Buckinghamshire | Information & communication | 2009 |
| Agena Consulting Limited | Information & communication | 2010 |
| AGF Electrical Solutions Ltd | Construction | 2023 |
| Aggrade Limited | Financial services | 2014 |
| Agile IT Limited | Information & communication | 2004 |
| Agileon Consulting Limited | Information & communication | 2025 |
| Agility Surveying Ltd | Professional & scientific | 2020 |
| Agishan Limited | Wholesale & retail | 2016 |
| Agora Digital Art (ADA) Ltd | Information & communication | 2016 |
| Agria Pet Insurance Limited | Financial services | 2001 |
| Agrihub Development Ltd | Agriculture & fishing | 2020 |
| Ahern Medical Secretarial Ltd | Professional & scientific | 2020 |
| Ahilan Icare Ltd | Health & social care | 2019 |
| Ahmad & Co Motors Ltd | Wholesale & retail | 2024 |
| Ahot Ltd | Professional & scientific | 2024 |
| AHS Pharma Limited | Professional & scientific | 2025 |
| AI Energy Limited | Construction | 2023 |
| AI Language Innovations Ltd | Information & communication | 2018 |
| AIB (Freeholds) Limited | Real estate | 1967 |
| Aight Ltd | Hospitality | 2026 |
| Aihope Solutions Ltd | Information & communication | 2026 |
| Aikim Group Ltd | Wholesale & retail | 2025 |
| Ailakoko Limited | Manufacturing | 2022 |
| AIM Measurement Services Ltd | Mining & quarrying | 2017 |
| AIM4SUCCESS Ltd | Education | 2020 |
| Aingara Transport Limited | Transport & logistics | 2014 |
| Air Conditioning & Environmental Services Limited | Energy | 2002 |
| Air Leakage Testing Limited | Professional & scientific | 2002 |
| Air Pillows Limited | Manufacturing | 2009 |
| Aira (Aircraft Interior Recycling Associates) Ltd | Water & waste | 2016 |
| Aira Antique Collections Limited | Wholesale & retail | 2025 |
| Airmyprayer Limited | Information & communication | 2017 |
| Airs House Limited | Wholesale & retail | 2002 |
| Airsave Travel Ltd | Other services | 2012 |
| Airspeed Electronics Ltd | Professional & scientific | 2018 |
| Aiza Group Ltd. | Hospitality | 2020 |
| Aizah Properties Ltd | Real estate | 2021 |
| AJ Autocare (AY) Ltd | Wholesale & retail | 2023 |
| AJ Automatics Ltd | Wholesale & retail | 2022 |
| AJ Cars (Aylesbury) Limited | Transport & logistics | 2018 |
| AJ Chef Consultant Ltd | Professional & scientific | 2026 |
| AJ Coffey Electrical Services Ltd | Construction | 2024 |
| AJ Consulting (Oxon) Ltd | Professional & scientific | 2022 |
| AJ Glitters Ltd | Wholesale & retail | 2020 |
| AJ Growth Limited | Professional & scientific | 2022 |
| AJ Learning Group Ltd | Education | 2019 |
| AJ World Foods Ltd | Wholesale & retail | 2020 |
| Ajay Property Investments Ltd | Real estate | 2020 |
| AJC Electrical Installations Ltd | Construction | 2015 |
| AJD Football Coaching Limited | Arts & recreation | 2015 |
| Ajinth Property Investment Ltd | Real estate | 2024 |
| AJJ Fashion & Design Ltd | Wholesale & retail | 2021 |
| AJM Enterprises Ltd | Wholesale & retail | 2024 |
| Ajpt Construction Limited | Construction | 2012 |
| Ajptlb Limited | Real estate | 2020 |
| AJR Funerals Limited | Other services | 2024 |
| AJZ Construction Ltd | Construction | 2026 |
| AK Eastern Spice Ltd | Hospitality | 2003 |
| AK Krsna Limited | Wholesale & retail | 2021 |
| AK Loos Ltd | Water & waste | 2023 |
| AKA Sports Ltd | Wholesale & retail | 2019 |
| Akaal Advisors Limited | Professional & scientific | 2025 |
| Akaal Real Estate Ltd | Real estate | 2026 |
| Akcend Ltd | Information & communication | 2025 |
| Akdesign Consultants Limited | Construction | 2011 |
| Akeman Consulting Ltd | Professional & scientific | 2018 |
| Akeman Motorhomes Limited | Administrative & support | 2023 |
| AKG Financial Analytics Ltd | Financial services | 1995 |
| AKG Group Limited | Professional & scientific | 1999 |
| Akinz Care Ltd | Administrative & support | 2019 |
| AKJ Healthcare Services Limited | Health & social care | 2017 |
| Akkk Properties Limited | Real estate | 2023 |
| Akmed Ltd | Wholesale & retail | 2025 |
| Akontaba Ltd | Other services | 2020 |
| Akoy Consultants Ltd | Administrative & support | 2023 |
| AKR Systems Validation Ltd | Professional & scientific | 2023 |
| AKR Ventures Ltd | Hospitality | 2020 |
| Akropolis Tile and Bath Store Limited | Wholesale & retail | 2009 |
| Aksa Global Ltd. | Information & communication | 2018 |
| Akshay Nidhi Consulting Limited | Information & communication | 2014 |
| Akura Trading Limited | Real estate | 1992 |
| AL Dente AL Ltd | Wholesale & retail | 2025 |
| AL Kebabish Aylesbury Limited | Hospitality | 2024 |
| AL Nasiriyah Ltd | Administrative & support | 2025 |
| AL Sourcing Ltd | Wholesale & retail | 2024 |
| Al-Kahf Foundation Community Interest Company | Education | 2020 |
| Al-Karaghouli Ltd | Wholesale & retail | 2023 |