| AAA Vander Ltd | Wholesale & retail | 2025 |
| Aaak Traders Ltd | Hospitality | 2025 |
| Aaamgroup UK Ltd | Wholesale & retail | 2026 |
| Aadhi Pixels Ltd | Professional & scientific | 2025 |
| Aahaus Ltd | Professional & scientific | 2026 |
| AAK Builders & Developers Limited | Real estate | 2022 |
| Aamir Therapy Ltd | Health & social care | 2025 |
| Aams Enterprise Limited | Health & social care | 2018 |
| Aandm Driving School London Ltd | Education | 2025 |
| Aarkis Enterprise Ltd | Wholesale & retail | 2026 |
| Aaron Hall Construction Ltd | Construction | 2025 |
| Aasaan Tech UK Ltd | Information & communication | 2025 |
| Aazal Limited | Real estate | 2024 |
| Abacus Advice Tax & Trusts Limited | Professional & scientific | 2019 |
| Abbadon Limited | Other services | 2019 |
| ABBEY14 Limited | Health & social care | 2012 |
| ABD London Trading Limited | Construction | 2016 |
| ABE Barber and Beauty Ltd | Other services | 2017 |
| ABE UK Trading Ltd | Transport & logistics | 2023 |
| Abib Properties Limited | Real estate | 2020 |
| Abington Medical Ltd | Health & social care | 2026 |
| Abington Rental Ltd | Real estate | 2026 |
| ABK Security Limited | Administrative & support | 2014 |
| Ably Ltd | Extraterritorial | 2013 |
| ABM Gordon Road Ltd | Construction | 2026 |
| ABN Investments Limited | Real estate | 2018 |
| ABN Promax Ltd | Real estate | 2021 |
| Above the Rest Plumbing & Heating Ltd | Administrative & support | 2016 |
| Abrupt Media Ltd | Information & communication | 2012 |
| Abss Consulting Services Limited | Information & communication | 2013 |
| ABT Roofing and Home Improvements Ltd | Construction | 2024 |
| ACA Alliance PTY Ltd | Construction | 2024 |
| Academically Rational Ltd | Education | 2024 |
| Acar Investments Limited | Wholesale & retail | 2026 |
| Access Mobility Transport Limited | Transport & logistics | 2002 |
| Access Secure Ltd | Administrative & support | 2024 |
| Accord Family Services Ltd | Other services | 2014 |
| Accotax Accountants & Tax Consultants Ltd | Professional & scientific | 2011 |
| Accotax London Ltd | Information & communication | 2011 |
| Accountax Training Hub Ltd | Education | 2026 |
| Accounting Firms Ltd | Information & communication | 2021 |
| Accounty Ltd | Professional & scientific | 2019 |
| Accra Communities Development Foundation | Health & social care | 2016 |
| Ace (Dudley) Limited | Real estate | 2015 |
| Ace Driving Academy Limited | Education | 2023 |
| Ace Expo Ltd | Administrative & support | 2022 |
| Ace Recruitment & Contractor Services Limited | Administrative & support | 2018 |
| Aceo One Ltd | Transport & logistics | 2026 |
| Acestar Tutoring Ltd | Education | 2024 |
| Achal Trading Ltd | Transport & logistics | 2022 |
| Acinonyx Communications Ltd | Information & communication | 2022 |
| ACM Partners Ltd | Professional & scientific | 2024 |
| Acodixit Ltd | Health & social care | 2016 |
| Acomodaze Ltd | Hospitality | 2024 |
| Aconite Ltd | Construction | 2015 |
| Acron Engineering Services (UK) Ltd | Manufacturing | 2023 |
| Acsupplyco Ltd | Wholesale & retail | 2026 |
| Active and Healthy Futures CIC | Education | 2025 |
| Activelife Wellbeing Services Limited | Health & social care | 2021 |
| Acudrill Limited | Construction | 1997 |
| Adagoff & Sons Limited | Health & social care | 2016 |
| Adam's Classic Flooring Ltd | Construction | 2020 |
| Adamhasan Ltd | Hospitality | 2019 |
| Additional Intelligence Group Ltd | Administrative & support | 2025 |
| Additional Intelligence Ltd | Information & communication | 2026 |
| Addstream Plumbing & Heating Limited | Construction | 2016 |
| ADEELK1995 Limited | Information & communication | 2022 |
| Adela Advisory Ltd | Professional & scientific | 2012 |
| Adil Holdings Ltd | Financial services | 2026 |
| Adjani Trading Ltd | Health & social care | 2021 |
| ADP Entertainment Ltd | Information & communication | 2021 |
| Adsnewton Ltd | Energy | 2018 |
| Advan Capital Limited | Real estate | 2019 |
| Advan Properties Limited | Real estate | 2024 |
| Advance Link Limited | Other services | 2010 |
| Advanced Pharmaceuticals and Nutritions Ltd | Wholesale & retail | 2025 |
| Advicecube Consultancy UK Ltd | Extraterritorial | 2022 |
| Advisiti Consulting Group Ltd | Information & communication | 2025 |
| Aeem Builders Ltd | Construction | 2024 |
| Aegis Wing Tsun Limited | Education | 2018 |
| Aeromax Ltd | Wholesale & retail | 2026 |
| Aetos Products Ltd | Information & communication | 2019 |
| Aevin KLS Ltd | Health & social care | 2025 |
| Affan Enterprises Ltd | Wholesale & retail | 2015 |
| Affirm Accountant Limited | Professional & scientific | 2018 |
| Affirm Solutions Limited | Professional & scientific | 2021 |
| Africa Trading Ltd | Wholesale & retail | 2022 |
| Afro Clothing Limited | Wholesale & retail | 2020 |
| AFS Properties (London) Limited | Administrative & support | 2017 |
| AG Home Improvements Ltd | Construction | 2023 |
| Agilis Dating Ltd | Information & communication | 2023 |
| Agyemang & Sons Company Ltd | Health & social care | 2019 |
| AH Etraders Ltd | Wholesale & retail | 2026 |
| AHA Prime Ltd | Transport & logistics | 2026 |
| AHC Trading Ltd | Transport & logistics | 2022 |
| Ahintel Ltd | Information & communication | 2026 |
| Ahmad Alagbari Consultants Ltd | Professional & scientific | 2019 |
| Ahmad Services Limited | Administrative & support | 2018 |
| Ahmad Transport Ltd | Transport & logistics | 2022 |
| Ahmadf Ltd | Information & communication | 2020 |