| Akai Online Limited | Wholesale & retail | 2020 |
| Akamba Consults Ltd | Health & social care | 2025 |
| Akhtar Restaurant Ltd | Hospitality | 2025 |
| AKI Farming & Forestry Limited | Agriculture & fishing | 2022 |
| AKI Holdings Limited | Financial services | 2021 |
| AKI Properties Limited | Real estate | 2020 |
| AKM1 Ltd | Hospitality | 2022 |
| AKNI1525 Limited | Professional & scientific | 2014 |
| Akoh 1 Ltd | Construction | 2026 |
| Akra Limited | Wholesale & retail | 2022 |
| Akra Supermarket Ltd | Wholesale & retail | 2024 |
| Akram Preston Services Ltd | Transport & logistics | 2026 |
| AKS Medical Device Consultancy Ltd | Professional & scientific | 2026 |
| AKV Transport Ltd | Transport & logistics | 2023 |
| AL 101 Care Limited | Health & social care | 2022 |
| AL Ameer Ltd | Wholesale & retail | 2017 |
| AL Ayyam International Limited | Wholesale & retail | 2023 |
| AL Entertainment Limited | Arts & recreation | 2023 |
| AL Foods 2020 Ltd | Hospitality | 2020 |
| AL Hafeez Foundation | Education | 2017 |
| AL Hafeez Investments Ltd | Real estate | 2023 |
| AL Ihsan Limited | Real estate | 2014 |
| AL Janoob Holdings Limited | Professional & scientific | 2022 |
| AL Kaaf Tours Ltd | Administrative & support | 2025 |
| AL Physiotherapy Ltd | Health & social care | 2024 |
| AL Quds Express Ltd | Hospitality | 2019 |
| AL Rashid Limited | Hospitality | 2022 |
| AL Rayyan Retail Limited | Wholesale & retail | 2025 |
| AL Safa Foods Ltd | Wholesale & retail | 2021 |
| Al-Amin Trust | Education | 2011 |
| Al-Ansaar Welfare & Education | Other services | 2002 |
| Al-Aqsa Food Market Ltd | Wholesale & retail | 2021 |
| Al-Mujammil Fragrance Ltd | Wholesale & retail | 2024 |
| Al-Noor Tech Ltd | Wholesale & retail | 2023 |
| Al-Quran Learning Centre Ltd | Education | 2024 |
| Alabi Events Ltd | Hospitality | 2023 |
| Alajlan Company Limited | Extraterritorial | 2016 |
| Alamira Ltd | Hospitality | 2026 |
| Alan Astley Bricklayers Limited | Construction | 2013 |
| Alan Baybutt & Sons Limited | Agriculture & fishing | 2003 |
| Alan Burdett Limited | Administrative & support | 2017 |
| Alan Campbell Carpets Limited | Wholesale & retail | 2013 |
| Alan Cooper Limited | Professional & scientific | 1996 |
| Alan Dickinson Ltd | Construction | 2013 |
| Alan Joyce Hair Design Limited | Other services | 2010 |
| Alan Marsden Decorators Limited | Construction | 2007 |
| Alan Mathison Turing Limited | Real estate | 2019 |
| Alan Salisbury Limited | Construction | 2002 |
| Alan Wright & SON Joiners & Builders Limited | Construction | 2002 |
| Alancca Ltd | Construction | 2025 |
| ALB Management Limited | Transport & logistics | 2017 |
| ALB Properties (NW) Limited | Real estate | 2023 |
| Albemarle Staveley Evans Limited | Extraterritorial | 2003 |
| Alben Commercial Estates Ltd | Real estate | 2018 |
| Alben Landscapes Limited | Administrative & support | 2009 |
| Albion Edge Corporate Ltd | Information & communication | 2021 |
| Albion Medlock Limited | Extraterritorial | 1998 |
| Albion Motors Ltd | Wholesale & retail | 2025 |
| Albiony Limited | Wholesale & retail | 2024 |
| Alchemy Accountancy Limited | Professional & scientific | 2018 |
| Alchemy Accountants Limited | Extraterritorial | 2022 |
| Alchemy Minerals Limited | Health & social care | 2026 |
| Alclemie Architectural Consulting Ltd | Professional & scientific | 2018 |
| Alcn Holdings Limited | Financial services | 2021 |
| Alden Investments Limited | Real estate | 2019 |
| Alder Research Limited | Professional & scientific | 2013 |
| Alderbank Therapy Clinic Ltd | Health & social care | 2003 |
| Alderham Barford Group Ltd | Professional & scientific | 2021 |
| Alderley Advisory Limited | Professional & scientific | 2024 |
| Alec Dodd Joinery Limited | Manufacturing | 2015 |
| Alec Pattinson Limited | Construction | 2002 |
| Aleta Marketing Ltd | Professional & scientific | 2021 |
| Aletro Limited | Real estate | 2026 |
| Alex Dewhurst Construction Limited | Construction | 2022 |
| Alex Scott Limited | Administrative & support | 2012 |
| Alex Wright Developments Limited | Construction | 2022 |
| Alexander Degnen Livestock & Commercial Haulage Ltd | Administrative & support | 2016 |
| Alexander James Site Engineering Ltd | Construction | 2021 |
| Alexander Maclean Limited | Education | 2019 |
| Alexandra Courier NW Ltd | Transport & logistics | 2025 |
| Alexandra Events Limited | Professional & scientific | 2023 |
| Alexandra Rees Ltd | Administrative & support | 2023 |
| Alexandria.Winrow Ltd | Health & social care | 2026 |
| Alfa Home-F Ltd | Households | 2025 |
| Alfa UK Trading Limited | Wholesale & retail | 2015 |
| Alfanet 4 U Limited | Wholesale & retail | 2020 |
| Alfco Ltd | Information & communication | 2022 |
| Alfha Limited | Real estate | 2024 |
| Alfoot Business Solutions Ltd | Wholesale & retail | 2012 |
| Alforth Limited | Extraterritorial | 2016 |
| Algofuelspt Ltd | Wholesale & retail | 2024 |
| Algon Ltd | Manufacturing | 2001 |
| Alhasan Limited | Wholesale & retail | 2025 |
| Ali's Chippy & Takeaway Limited | Hospitality | 2026 |
| Ali's Chippy Ltd | Hospitality | 2009 |
| Alice and Olivia UK Limited | Wholesale & retail | 2016 |
| Alice Broadway Limited | Information & communication | 2025 |
| Alice PUB Ltd | Hospitality | 2025 |
| Alif Distribution Ltd | Hospitality | 2026 |
| Aligned Home Ventures Ltd | Financial services | 2025 |