| Afghan Initiative for Strategic Studies (Aiss) Ltd | Professional & scientific | 2020 |
| AFN Services Limited | Construction | 2026 |
| Afnan Accountants Ltd | Other services | 2018 |
| Afrah Trading Ltd | Wholesale & retail | 2022 |
| Africa Hopes in Christ | Wholesale & retail | 2015 |
| Afrooz Innovations Ltd | Wholesale & retail | 2026 |
| AG Info-Consulting Limited | Information & communication | 2017 |
| Ag&Mg Ltd | Real estate | 2025 |
| AGA Nanotech Ltd | Professional & scientific | 2014 |
| Agam Properties Limited | Real estate | 2026 |
| Agency IQ Limited | Information & communication | 2018 |
| Agfa Healthcare IT UK Limited | Information & communication | 2017 |
| Agile Governance Methods Ltd | Professional & scientific | 2023 |
| AGL Management Ltd | Real estate | 2024 |
| Agritech International Ltd | Financial services | 2023 |
| AGS Limited | Transport & logistics | 1991 |
| AH Film Services Limited | Information & communication | 2018 |
| AH West Property Ltd | Households | 2022 |
| Ahlulbayt Sisters Ltd | Other services | 2025 |
| AHM Technologies Limited | Manufacturing | 2014 |
| Ahmed Hassan Mohamed Ltd | Wholesale & retail | 2026 |
| Ahmed Traders London Limited | Professional & scientific | 2026 |
| Ahnwa Limited | Health & social care | 2014 |
| Ahora Investments Limited | Real estate | 2019 |
| AHR Engineering Ltd | Construction | 2026 |
| Ai-Driven Ltd | Information & communication | 2025 |
| AI8 Electrical Ltd | Construction | 2026 |
| AIB UK 2 LP | | 2006 |
| AIB UK 3 LP | | 2006 |
| AIB UK I LP | | 2004 |
| Aicertifyme Ltd | Education | 2025 |
| Aics (Acquired Injury Care & Support) Ltd | Health & social care | 2012 |
| Aidrak Limited | Wholesale & retail | 2019 |
| Aikon Limited | Hospitality | 2018 |
| Aikwonyam Ltd | Information & communication | 2023 |
| Ailbhe & Axel Ltd | Arts & recreation | 2020 |
| AIM Business Consulting Ltd | Information & communication | 2023 |
| Air & Land Construction Ltd | Construction | 2022 |
| Air and Sound Compliance Ltd | Construction | 2022 |
| Air Tigers Logistic Limited | Transport & logistics | 2022 |
| Airbeas Travel Ltd | Administrative & support | 2020 |
| Aiseandan Holdings Limited | Real estate | 2026 |
| Aiseandan Limited | Real estate | 2005 |
| Aiseandan Plant Limited | Construction | 2007 |
| AJ Design(Uk) Ltd | Construction | 2016 |
| AJ Exclusive Security Ltd | Administrative & support | 2012 |
| AJ Fashion Ltd | Wholesale & retail | 2025 |
| AJ Realty Limited | Real estate | 2016 |
| AJ Residency Limited | Real estate | 2025 |
| Ajax Trading Ltd | Professional & scientific | 2021 |
| AJG Law Limited | Professional & scientific | 2013 |
| AJJ Transport Limited | Transport & logistics | 2026 |
| AJS Drainage Services Ltd | Water & waste | 2026 |
| AJT Commerce Ltd | Wholesale & retail | 2025 |
| Ajumi's Limited | Hospitality | 2025 |
| AJW Management Services Ltd | Administrative & support | 2025 |
| AK Barber CUT Ltd | Other services | 2023 |
| AK Plumbing Services Limited | Administrative & support | 2017 |
| AK Reliable Scaffolding Limited | Construction | 2023 |
| AK Tanning Ltd | Other services | 2025 |
| AK Tracks Ltd | Administrative & support | 2020 |
| Akaal Glass Ltd | Construction | 2025 |
| Akadian Limited | Health & social care | 2011 |
| Akalaa Homes Ltd | Real estate | 2025 |
| Akeez Ltd | Hospitality | 2022 |
| Akena Ltd | Wholesale & retail | 2014 |
| AKH Corporations Ltd | Real estate | 2020 |
| Akhi Attire Ltd | Wholesale & retail | 2024 |
| AKI UK Limited | Wholesale & retail | 2005 |
| Akirax Limited | Wholesale & retail | 2025 |
| Akkar Lebanese Cuisine Ltd | Hospitality | 2025 |
| Aklk Consultancy Limited | Professional & scientific | 2021 |
| AKM Properties Development Ltd | Real estate | 2022 |
| Akng Properties Ltd | Real estate | 2022 |
| AKO Autism Ltd | Arts & recreation | 2020 |
| AKR Advisory Ltd | Professional & scientific | 2025 |
| Akshar Property Care Ltd | Real estate | 2026 |
| Aksm Project Management Ltd | Real estate | 2025 |
| AL ALI Ltd | Wholesale & retail | 2026 |
| AL Bilal Group Ltd | Real estate | 2016 |
| AL HAJ Pakistan Exploration Limited | Mining & quarrying | 1974 |
| AL Insights Ltd | Professional & scientific | 2023 |
| AL Trader Limited | Wholesale & retail | 2025 |
| AL Watani Telecom Ltd | Wholesale & retail | 2020 |
| AL Zaman Group Ltd | Wholesale & retail | 2026 |
| Al-Baith Ltd | Other services | 2025 |
| Alabed Limited | Other services | 2006 |
| Alaga Intensive Ltd | Health & social care | 2013 |
| Alan C Ford (Homes) Ltd | Construction | 2026 |
| Alan John Associates Limited | Health & social care | 1999 |
| Alan Morkill House Holdings Ltd | Health & social care | 2012 |
| Alanka Ltd | Professional & scientific | 2019 |
| Alans Removals Limited | Transport & logistics | 2020 |
| Alara Properties Limited | Real estate | 2026 |
| Albadani Investments Ltd | Real estate | 2025 |
| Albatross DG Services Ltd | Information & communication | 2014 |
| Albert Building Services Limited | Construction | 2011 |
| Albion Grove Ltd | Real estate | 2021 |
| Albright Gardens, Walton on Thames Management Company Limited | Households | 2020 |
| Alcip Trans Ltd | Transport & logistics | 2018 |