| AJ Timber Group Ltd | Construction | 2023 |
| Ajak Solutions Ltd | Professional & scientific | 2020 |
| Ajani Estates Limited | Real estate | 2022 |
| Ajay KUMAR2 Ltd | Construction | 2025 |
| AJB Line Limited | Other services | 2018 |
| AJD Contractors Limited | Construction | 2017 |
| Ajeak Limited | Health & social care | 2023 |
| AJI Facilities Management Ltd | Administrative & support | 2021 |
| Ajiga Property Limited | Real estate | 2025 |
| Ajobi Integrated International Group Limited | Mining & quarrying | 2025 |
| Ajplus Ltd | Water & waste | 2023 |
| AJR Exim Limited | Agriculture & fishing | 2023 |
| Ajrisa Cafe Ltd | Hospitality | 2026 |
| AJS 93 Limited | Real estate | 2024 |
| AJV Developments Ltd | Real estate | 2012 |
| AJV Group Ltd | Financial services | 2020 |
| AJV Music Ltd | Information & communication | 2025 |
| AJW FM Limited | Transport & logistics | 2025 |
| AK Cleaning Solution UK Limited | Administrative & support | 2017 |
| AK Electrical London Ltd | Construction | 2018 |
| AK Optimize Ltd | Professional & scientific | 2017 |
| AK Site Solutions Ltd | Construction | 2019 |
| AK Trade Ltd | Real estate | 2021 |
| AK Van Sales Limited | Wholesale & retail | 2026 |
| Ak&D Solutions Ltd | Construction | 2018 |
| AKA Couriers Limited | Transport & logistics | 2010 |
| Akadia Construction Limited | Construction | 2012 |
| Akain Safe Care Ltd | Administrative & support | 2017 |
| Akal Bhogal Ltd | Construction | 2024 |
| Akanfe Ltd | Professional & scientific | 2025 |
| Akatan Limited | Wholesale & retail | 2026 |
| AKB Direct Limited | Real estate | 2025 |
| AKD Ceilings Ltd | Construction | 2015 |
| Akel Elegance Services Ltd | Transport & logistics | 2015 |
| Akinita Properties Limited | Real estate | 2026 |
| Akinphil Limited | Information & communication | 2024 |
| Akinyemi Idowu Property Ltd | Real estate | 2023 |
| Akkb Consulting Limited | Real estate | 2017 |
| Akktradingschool Ltd | Education | 2024 |
| Akman Ltd | Information & communication | 2026 |
| AKN65 Ltd | Hospitality | 2024 |
| Aknor UK Trading Ltd | Construction | 2012 |
| Aknsw Properties Ltd | Real estate | 2021 |
| AKO KDR Ltd | Wholesale & retail | 2025 |
| Akosh Groups Limited | Financial services | 2023 |
| Akosh Limited | Administrative & support | 2011 |
| Akro Pharmaceutical Company Limited | Wholesale & retail | 1998 |
| Akro Properties Limited | Real estate | 2021 |
| AKS Advisors Ltd | Professional & scientific | 2025 |
| AKS Moto Ltd | Other services | 2025 |
| AKS Residential Limited | Real estate | 2016 |
| Aksot Industrials Limited | Professional & scientific | 2019 |
| Aksx Services Ltd | Other services | 2022 |
| Aktar Logic Limited | Wholesale & retail | 2025 |
| Aktive Child Limited | Health & social care | 2025 |
| Aktive Healthcare Limited | Health & social care | 2014 |
| Aktive Holdings Limited | Wholesale & retail | 2026 |
| Aktive Homes Limited | Households | 2022 |
| Akuchi Services Ltd | Health & social care | 2022 |
| AKZ & Co Ltd | Construction | 2011 |
| AL ASR Accountants Limited | Professional & scientific | 2014 |
| AL Carpentry&Joinery Ltd | Manufacturing | 2020 |
| AL Faisal Real Estate Ltd | Real estate | 2024 |
| AL Hayya Estates Ltd | Real estate | 2022 |
| AL Marjan UK Ltd | Wholesale & retail | 2026 |
| AL NAZ Limited | Professional & scientific | 2025 |
| AL Rayyan Indo Arabic Cuisine Ltd | Hospitality | 2025 |
| AL Rehan Properties LLP | | 2023 |
| AL Shifa Medical and General Services Limited | Professional & scientific | 2014 |
| AL Wadood Food Delivery Limited | Wholesale & retail | 2023 |
| AL Wellness Services Ltd | Health & social care | 2025 |
| Al-Ahad Foundation Limited | Other services | 2021 |
| Al-Hadi Jask Limited | Manufacturing | 2020 |
| Al-Hadi Shoro Limited | Manufacturing | 2022 |
| Al-Hadi Sweets Town Ltd | Financial services | 2024 |
| Al-Noor Foundation Limited | Education | 1997 |
| Alags ( U.K. ) Limited | Professional & scientific | 2002 |
| Alam Estates Limited | Real estate | 2023 |
| Alam's Investment Ltd | Real estate | 2019 |
| Alan Diagnostic Ltd | Health & social care | 2020 |
| Alan Jacob Estates Ltd | Real estate | 2023 |
| Alan Kemp Sports Limited | Wholesale & retail | 2022 |
| Alan Rare Ltd | Wholesale & retail | 2025 |
| Alan Trent Design Ltd | Wholesale & retail | 2013 |
| Alanbrooke Partners Limited | Real estate | 2026 |
| Alarga Limited | Hospitality | 2024 |
| Alaya Consultants Ltd | Professional & scientific | 2021 |
| Alaynz K9 Security Limited | Administrative & support | 2024 |
| Alaynz Traders Ltd | Wholesale & retail | 2023 |
| Alb-Gas & Plumbing Ltd | Construction | 2018 |
| Albany Limited | Information & communication | 1994 |
| Albany Mews Development Ltd | Construction | 2021 |
| Albany News and Wine Ltd | Administrative & support | 2016 |
| Albany Road Chadwell Heath Residents Association Limited | Households | 1998 |
| Albavisha Ltd | Construction | 2008 |
| Albdoc Ltd | Health & social care | 2023 |
| Alberslinks Limited | Real estate | 1967 |
| Albert LEE GAS Ltd | Construction | 2015 |
| Alberta Ltd | Wholesale & retail | 2024 |
| Albertina Associates Limited | Construction | 2023 |