| Alex&Chris Window Cleaning Ltd | Administrative & support | 2025 |
| ALEXAN7 Ltd | Construction | 2025 |
| Alexander Mews Limited | Households | 2002 |
| Alexander Ross Trading Limited | Administrative & support | 2013 |
| Alexandru Services Limited | Construction | 2016 |
| Alexb Construction Ltd | Construction | 2025 |
| Alexe Plumbing Ltd | Construction | 2025 |
| Alexzd Ltd | Transport & logistics | 2017 |
| Alfa Supply Ltd | Construction | 2018 |
| Alfadhli Property Management Ltd | Households | 2026 |
| Alfalaq Foundation CIC | Public administration | 2021 |
| Alfons Services Ltd | Health & social care | 2020 |
| Alfroicu Ltd | Manufacturing | 2018 |
| Algarve Deli Limited | Hospitality | 2013 |
| Algo Empire Ltd | Real estate | 2020 |
| Algobit Ltd | Information & communication | 2022 |
| Algodon Engineering Limited | Professional & scientific | 2019 |
| Alhoda Holding Ltd | Professional & scientific | 2026 |
| ALI & J Ltd | Administrative & support | 2020 |
| Alias RUM Limited | Real estate | 2010 |
| Alice & Andrew Investments Limited | Real estate | 2021 |
| Alice and Andrew Two Limited | Real estate | 2024 |
| Alifba Enterprises Ltd | Wholesale & retail | 2025 |
| Align by Aamir Limited | Health & social care | 2022 |
| Align by Natasha Limited | Health & social care | 2025 |
| Alinea Psychologies Limited | Health & social care | 2021 |
| Alinora Limited | Professional & scientific | 2004 |
| Alisha Raja Limited | Information & communication | 2012 |
| ALL About Laptops Ltd | Manufacturing | 2011 |
| ALL Bright Experts Ltd | Wholesale & retail | 2025 |
| ALL Building Solution Consultants Ltd | Construction | 2016 |
| ALL Christian Practical Praying Band | Other services | 2014 |
| ALL Copy Products Ltd | Administrative & support | 2014 |
| ALL in House Services Limited | Real estate | 2024 |
| ALL in One Pizza Limited | Hospitality | 2025 |
| ALL in One Retail Limited | Wholesale & retail | 2024 |
| ALL Pharma Group Ltd | Wholesale & retail | 2026 |
| ALL4ONE London Limited | Health & social care | 2020 |
| Allcare Interiors Ltd | Construction | 2022 |
| Allied Solutions Group Limited | Arts & recreation | 2005 |
| Allison Brothers,Limited | Administrative & support | 1918 |
| Allsopp and Able Limited | Transport & logistics | 2017 |
| Allure Restaurant Ltd | Hospitality | 2025 |
| ALM Advisory Ltd | Professional & scientific | 2022 |
| Almaas Cuisine Limited | Hospitality | 2024 |
| Almass Construction Ltd | Construction | 2017 |
| Alme Ltd | Information & communication | 2014 |
| Alois General Building Ltd | Construction | 2018 |
| Alomarada Ltd | Administrative & support | 2018 |
| Alondon Communications Limited | Information & communication | 2004 |
| Alpha 88 Developments Ltd | Real estate | 2016 |
| Alpha and Beta Capital Limited | Real estate | 2023 |
| Alpha Josiak Limited | Real estate | 2015 |
| Alpha Research Technicals Limited | Professional & scientific | 2024 |
| Alphabrix Assets Limited | Construction | 2023 |
| Alphabrix Buildings Limited | Construction | 2024 |
| Alphabrix Construction Limited | Construction | 2021 |
| Alphabrix Investments Limited | Real estate | 2018 |
| Alphabrix Projects Limited | Construction | 2022 |
| Alphabrix Ventures Limited | Construction | 2022 |
| Alphamega Building Construction Ltd | Construction | 2019 |
| Alphaskill Limited | Professional & scientific | 2018 |
| Alphatess Holdings Limited | Health & social care | 2024 |
| Alpine Estate Management Limited | Real estate | 2009 |
| Alprose Limited | Real estate | 2010 |
| Alps Plus Holidays Ltd | Hospitality | 2019 |
| Alqaraawi Holding Ltd | Real estate | 2020 |
| ALS RBC Limited | Professional & scientific | 2015 |
| Alsab Construction Ltd | Construction | 2026 |
| Alsen Builders Limited | Construction | 2006 |
| Alshumouk Ltd | Construction | 2025 |
| Altheon Digital Ltd | Professional & scientific | 2025 |
| Alton Dental Ltd | Health & social care | 2014 |
| Alton Road Limited | Real estate | 2006 |
| Alvin Lawrence Limited | Professional & scientific | 2009 |
| ALY Trans Ltd | Transport & logistics | 2016 |
| Alyan Food Limited | Wholesale & retail | 2020 |
| Alzabayih Limited | Wholesale & retail | 2025 |
| AM Creative Designs Limited | Arts & recreation | 2013 |
| AM Education Services Ltd | Education | 2022 |
| AM Petcare Ltd | Professional & scientific | 2023 |
| AM Pojala Ltd | Other services | 2016 |
| AM Property Managment Ltd | Real estate | 2019 |
| AM Proserve Ltd | Construction | 2025 |
| AM Tanning Ltd | Other services | 2025 |
| AM Translation Limited | Professional & scientific | 2015 |
| AMA H&H Limited | Wholesale & retail | 2021 |
| Amajo Ltd | Wholesale & retail | 2020 |
| Amakiwumiarchitects Limited | Construction | 2023 |
| Amap Investments Limited | Real estate | 2016 |
| Amaryllis Legal Limited | Professional & scientific | 2019 |
| Amayo Properties Limited | Real estate | 2018 |
| Amazing Kitchens & Bedrooms Ltd | Construction | 2023 |
| Amazing Tiles Limited | Wholesale & retail | 2001 |
| Ambali Drinks Ltd | Manufacturing | 2026 |
| Ambee Limited | Administrative & support | 2008 |
| Amber Consultancy Limited | Extraterritorial | 2022 |
| Amber Estates & Management Limited | Real estate | 2017 |
| Amber Fire Wear Holdings Ltd | Wholesale & retail | 2024 |
| Amber Moves Limited | Transport & logistics | 2025 |