| AJ Sergent Roofing Ltd | Construction | 2026 |
| AJ Wroe Furniture and Joinery Limited | Construction | 2026 |
| Ajawa Limited | Hospitality | 2025 |
| AJB Formwork Limited | Construction | 2019 |
| AJB Search Limited | Other services | 2019 |
| AJG Groundwork’S Services Ltd | Construction | 2026 |
| AJH Consultants Limited | Professional & scientific | 2022 |
| AJH Investments Ltd | Real estate | 2017 |
| Ajirv Solutions Ltd | Professional & scientific | 2025 |
| AJJ Software Consultancy Ltd | Information & communication | 2017 |
| AJL Heating Ltd | Financial services | 2026 |
| AJM Functions Limited | Wholesale & retail | 2025 |
| AJS Piri Piri Limited | Hospitality | 1991 |
| Ajune Limited | Real estate | 2025 |
| AJV Properties Ltd | Real estate | 2024 |
| Ajwa Trading Limited | Wholesale & retail | 2026 |
| AK & Sons Limited | Real estate | 2022 |
| AK 10 Ltd | Professional & scientific | 2011 |
| AK Care Solutions Ltd | Health & social care | 2026 |
| AK Electrician Building Service Ltd | Construction | 2024 |
| AK Forecourt NORTH2 Limited | Real estate | 2024 |
| AK Forecourts Ltd | Wholesale & retail | 2018 |
| AK Forecourts North Ltd | Wholesale & retail | 2023 |
| AK Global Assets Ltd | Financial services | 2025 |
| AK Nathan Properties Limited | Real estate | 2017 |
| AK Park Lane Ltd | Real estate | 2024 |
| AK Plan Co. Limited | Real estate | 2020 |
| AK Plumbing (Charvil) Ltd | Construction | 2017 |
| AK Real Estate Management Ltd | Real estate | 2025 |
| AK Retail Ltd | Wholesale & retail | 2015 |
| AK Retail NORTH2 Limited | Wholesale & retail | 2024 |
| AK Superstore Ltd | Wholesale & retail | 2023 |
| AK Systems London Limited | Information & communication | 2025 |
| AK Windows London Ltd | Construction | 2023 |
| AKA Broadcast Ltd | Manufacturing | 2011 |
| AKA Security Solutions Limited | Construction | 2025 |
| AKA UN Ltd | Wholesale & retail | 2024 |
| Akaal Services Limited | Real estate | 2022 |
| Akagi Auto Limited | Wholesale & retail | 2015 |
| Akan Vision Limited | Information & communication | 2026 |
| Akandai Ltd | Information & communication | 2024 |
| Akande Digital Ltd | Information & communication | 2020 |
| Akanji Studio Wellness CIC | Education | 2025 |
| Akap Group Ltd | Professional & scientific | 2016 |
| AKC Site Services Limited | Professional & scientific | 2017 |
| Akcea Therapeutics UK Ltd. | Professional & scientific | 2016 |
| Akep Real Estate Investments Limited | Real estate | 2026 |
| Akhitek Consulting Ltd | Information & communication | 2025 |
| Akiba Homes Ltd | Real estate | 2020 |
| Akin Alfred Care and Cleaning Ltd | Health & social care | 2024 |
| AKJ Freight Ltd | Transport & logistics | 2025 |
| AKL Management Ltd | Real estate | 2020 |
| AKM Geoconsulting Ltd | Professional & scientific | 2018 |
| AKN Property Management Consultants Ltd | Real estate | 2018 |
| Akoni Technologies Ltd | Information & communication | 2019 |
| Akpc Ltd | Financial services | 2024 |
| AKR Capital Ltd | Real estate | 2017 |
| Akre Construction Limited | Construction | 2025 |
| Akree Limited | Construction | 2019 |
| Aksons Investments Ltd | Financial services | 2015 |
| Aksons Technologies Ltd | Information & communication | 2011 |
| Aktas Vitamins Pro Ltd | Wholesale & retail | 2025 |
| Aktr Ltd | Administrative & support | 2022 |
| AKV Consultants Limited | Wholesale & retail | 2011 |
| Akwa Holdings Limited | Agriculture & fishing | 2019 |
| Akys Tyres Mobile Tyre Fitting Ltd | Wholesale & retail | 2024 |
| AKZ39 Ltd | Professional & scientific | 2022 |
| AL Hayat Limited | Wholesale & retail | 2026 |
| AL Huda Acade Ltd | Education | 2025 |
| AL Huda Network CIC | Other services | 2025 |
| AL Investment Management Holdings Limited | Financial services | 2024 |
| AL Marwan Welfare UK Limited | Administrative & support | 2025 |
| AL Quds Limited | Wholesale & retail | 2026 |
| AL Saleh Services Limited | Construction | 2023 |
| AL Sultanate Ltd | Wholesale & retail | 2025 |
| AL Venture Builders Ltd | Financial services | 2019 |
| Al-Flo Care Ltd | Health & social care | 2020 |
| Al-Ihsaan Education CIC | Education | 2026 |
| Al-Momin Boutique UK Ltd | Wholesale & retail | 2023 |
| Al-Wahab Halal Meat Ltd | Wholesale & retail | 2025 |
| Alacrity Consultancy Ltd | Professional & scientific | 2022 |
| Alacrity Trading Ltd | Wholesale & retail | 2022 |
| Aladeebfood Limited | Hospitality | 2024 |
| Aladins Fast Food Ltd | Hospitality | 2022 |
| Alamein Limited | Information & communication | 2000 |
| Alan Hadley Limited | Water & waste | 1933 |
| Alan Short Hairdressing Limited | Other services | 2015 |
| Alan Ward Consulting Limited | Extraterritorial | 2013 |
| Alani Consultancy Ltd | Administrative & support | 2022 |
| Alanis Coach Travel Ltd | Transport & logistics | 2022 |
| Alans Electrical Services Reading Ltd | Construction | 2017 |
| Alarm Response (Central) Ltd | Other services | 2023 |
| Alastair Frith Wealth Management (IFA) Limited | Professional & scientific | 2014 |
| Alastair Nicholas Court Residents Association Limited | Real estate | 1999 |
| Alauda Learning Centre Limited | Education | 2015 |
| Albaby Investments Limited | Real estate | 1963 |
| Alban Engineering Services Ltd | Professional & scientific | 2022 |
| Albany Gardens Residents Association Limited | Households | 2006 |
| Albany Software Limited | Extraterritorial | 1989 |
| Albany Wealth Limited Partnership | | 2015 |