| AI Stylelab Ltd | Financial services | 2022 |
| AI Tech Invest Ltd | Extraterritorial | 2013 |
| AI Venture X Ltd | Information & communication | 2023 |
| Aiaging Limited | Wholesale & retail | 2025 |
| Aibor International Group Ltd | Extraterritorial | 2020 |
| Aicha Global Trading Ltd | Wholesale & retail | 2026 |
| Aiclho Ltd | Information & communication | 2023 |
| Aicomfine Ltd | Information & communication | 2025 |
| Aicountant Ltd | Information & communication | 2026 |
| Aigona Ltd | Information & communication | 2025 |
| Aika Marketing Ltd | Professional & scientific | 2023 |
| Ailiyangyang Ltd | Wholesale & retail | 2025 |
| Aill UK Limited | Information & communication | 2022 |
| Ailwood Advisory UK Limited | Professional & scientific | 2023 |
| AIM Beyond Ltd | Education | 2025 |
| AIM Digital UK Limited | Wholesale & retail | 2024 |
| Aimoly International Trade Limited | Wholesale & retail | 2025 |
| Aimu Culture Ltd | Wholesale & retail | 2025 |
| Ainos Hawker Industry Group Co., Ltd | Manufacturing | 2025 |
| Aiocrane Technical Service Co., Ltd | Administrative & support | 2022 |
| Air Card Trading Co., Ltd | Wholesale & retail | 2023 |
| Air Executive Ltd | Transport & logistics | 2012 |
| Air Quality Experts Global Ltd | Administrative & support | 2014 |
| Airahere Ltd | Wholesale & retail | 2025 |
| Airecoo Ltd | Wholesale & retail | 2025 |
| Airfanta Purification Technology Ltd | Wholesale & retail | 2024 |
| Airhomestay Ltd | Hospitality | 2024 |
| Airuizezf Co., Ltd | Wholesale & retail | 2025 |
| Aitoolverse Ltd | Wholesale & retail | 2025 |
| Aitopx Global Limited | Financial services | 2025 |
| Aitthiporn Ltd | Hospitality | 2020 |
| Aivana Technology Ltd | Information & communication | 2025 |
| Aixionis Limited | Other services | 2026 |
| Ajem Finance Ltd | Professional & scientific | 2025 |
| Ajhdtn Ltd | Wholesale & retail | 2025 |
| Ajiwai Durham Limited | Hospitality | 2020 |
| AJJ Consulting Services Limited | Information & communication | 2015 |
| Ajjk Consulting Limited | Professional & scientific | 2019 |
| AJN Finance Limited | Financial services | 2002 |
| Ajna Creative Health CIC | Education | 2025 |
| AJT Social Care Ltd | Professional & scientific | 2024 |
| Ajuby International Limited | Wholesale & retail | 2023 |
| AK Club Hospitality Limited | Wholesale & retail | 2024 |
| AK Mart Limited | Wholesale & retail | 2025 |
| AK Pinnacle Limited | Financial services | 2025 |
| Akaere Networks Technology Ltd | Wholesale & retail | 2025 |
| Akari Networks Ltd | Information & communication | 2019 |
| AKC Solution Limited | Wholesale & retail | 2022 |
| Akesis Ltd | Information & communication | 2016 |
| Akhtar Technologies Limited | Information & communication | 2023 |
| Akizo Ltd | Wholesale & retail | 2025 |
| Akjk Shop Limited | Wholesale & retail | 2025 |
| Aklima UK Ltd | Wholesale & retail | 2026 |
| Akokotoysquishy Ltd | Wholesale & retail | 2026 |
| Akqz Optics Ltd | Health & social care | 2024 |
| Aksh Consulting Ltd | Information & communication | 2014 |
| Aktiv Kapital Portfolio I Limited | Financial services | 2026 |
| Akua Home Ltd | Wholesale & retail | 2021 |
| Akua IT Services Ltd | Information & communication | 2018 |
| AL Hamsan Ltd | Wholesale & retail | 2026 |
| AL Jalalin Import &Export Co., Ltd | Wholesale & retail | 2023 |
| AL Karim Corporation Ltd | Wholesale & retail | 2024 |
| AL Khaleej & Co Ltd | Transport & logistics | 2021 |
| AL Markaz AL Madni Ltd | Wholesale & retail | 2025 |
| AL Noor China Co., Ltd | Wholesale & retail | 2023 |
| AL Qamar Threads Ltd | Wholesale & retail | 2026 |
| AL Shaheen International Trading Co., Ltd | Wholesale & retail | 2023 |
| AL Syed Global Ltd | Wholesale & retail | 2025 |
| Al-Barr Care Group Ltd | Administrative & support | 2021 |
| Al-Dente Services Limited | Wholesale & retail | 2023 |
| Al-Razaa Limited | Wholesale & retail | 2022 |
| Alaby Ltd | Health & social care | 2025 |
| Alana Impex Ltd | Other services | 2017 |
| Alancia Keys Limited | Real estate | 2023 |
| Alanyhq Networks Limited | Information & communication | 2020 |
| Alaray Ltd | Professional & scientific | 2018 |
| Alastair Wood Accs Ltd | Professional & scientific | 2006 |
| Albion Roma Digital Ltd | Information & communication | 2025 |
| Alcohol Free World Limited | Wholesale & retail | 2026 |
| Aldebran Ltd | Wholesale & retail | 2023 |
| Alden Business Consultancy Ltd | Professional & scientific | 2025 |
| Aldravin Global Ltd | Wholesale & retail | 2025 |
| Aldrene Gargett Ltd | Extraterritorial | 2021 |
| Aldrene Heather Gargett Ltd | Extraterritorial | 2024 |
| Aleatya Limited | Wholesale & retail | 2025 |
| Aleatyal Ltd | Wholesale & retail | 2025 |
| Aleatye Ltd | Wholesale & retail | 2025 |
| Alee & Co Ltd | Real estate | 2022 |
| Aleena Signature Homes Ltd | Hospitality | 2026 |
| Aleph Intelligence Ltd | Information & communication | 2026 |
| Alertech Security Systems Ltd | Construction | 2026 |
| Alerther Ltd | Information & communication | 2025 |
| Alex Martinsmith Ltd | Information & communication | 2023 |
| Alexander Bain and Associates Limited | Professional & scientific | 2010 |
| Alexander IPC Ltd | Professional & scientific | 2024 |
| Alfi Apps Ltd | Information & communication | 2026 |
| Alfred Nathan Capital Limited | Professional & scientific | 2022 |
| Algocyclone Ltd | Wholesale & retail | 2024 |
| Algonquin Vorstearl Ltd | Wholesale & retail | 2025 |
| Algorithm Tradings Ltd | Financial services | 2025 |