| Ayden Assets Limited | Real estate | 2017 |
| Ayden Holdings Limited | Real estate | 2017 |
| Aydenke Limited | Manufacturing | 2023 |
| Aydin Catering Limited | Manufacturing | 2020 |
| Aydin Limited | Wholesale & retail | 2021 |
| Aydinlar Ltd | Wholesale & retail | 2025 |
| Aydun Williams Limited | Wholesale & retail | 2025 |
| Ayee Service Industry Ltd | Information & communication | 2019 |
| Ayem Tyres Limited | Wholesale & retail | 2026 |
| Ayesha Hassan Limited | Wholesale & retail | 2021 |
| Ayesha Holdings Ltd | Real estate | 2018 |
| Ayeshalogistics Limited | Wholesale & retail | 2025 |
| Ayeshatahir Trading Limited | Wholesale & retail | 2025 |
| Ayeshaz MIX Ltd | Wholesale & retail | 2019 |
| Ayeus One Ltd | Information & communication | 2012 |
| Ayitess Ltd | Water & waste | 2022 |
| AYK Motors Ltd | Wholesale & retail | 2023 |
| Aylesford Processing Ltd | Water & waste | 2018 |
| Aylin Trading Ltd | Wholesale & retail | 2026 |
| Aylward Electrical Services Ltd | Construction | 2019 |
| AYM Shafa Investments Limited | Financial services | 2022 |
| Ayon LLP | | 2019 |
| Ayra Foods Ltd | Hospitality | 2026 |
| Ayres Saddlery Limited | Manufacturing | 2014 |
| Ayrton Pricing Solutions Limited | Information & communication | 2024 |
| Aysel Commerce Ltd | Wholesale & retail | 2023 |
| AYT High Tech Co. Ltd | Administrative & support | 2024 |
| Aytel Systems Ltd | Information & communication | 1998 |
| AYU Digital Ltd | Information & communication | 2018 |
| Ayub Gulf Investment Ltd | Wholesale & retail | 2025 |
| AYZ Trading Ltd | Wholesale & retail | 2024 |
| Ayzals Online Store Ltd | Administrative & support | 2023 |
| AZ Active Sports Limited | Extraterritorial | 2012 |
| AZ Consulting Services Ltd | Professional & scientific | 2017 |
| AZ Elite CIC | Education | 2019 |
| AZ Fade Studio Ltd | Other services | 2026 |
| AZ H Business Tech Limited | Administrative & support | 2020 |
| AZ Houseware Ltd | Wholesale & retail | 2022 |
| AZ Logistic UK Limited | Transport & logistics | 2018 |
| Az.Development Ltd | Real estate | 2022 |
| AZ24 Ltd | Transport & logistics | 2015 |
| Azabaya LLP | | 2025 |
| Azad Hossain Trading Ltd | Wholesale & retail | 2025 |
| Azala Mart Ltd | Wholesale & retail | 2025 |
| Azalea Care and Education Limited | Education | 2022 |
| Azan Malik Ltd | Wholesale & retail | 2025 |
| Azania Global Holdings Ltd | Financial services | 2025 |
| Azbal Enterprise Ltd | Wholesale & retail | 2025 |
| Azbookus Ltd | Information & communication | 2020 |
| Azemba Properties (UK) Limited | Administrative & support | 2016 |
| Azembel Limited | Financial services | 2019 |
| Azented Ltd | Wholesale & retail | 2020 |
| Azeyta Global Ltd | Wholesale & retail | 2025 |
| Azfin Limited | Financial services | 2024 |
| Azgard Limited | Financial services | 2019 |
| Azhetouif Ltd | Wholesale & retail | 2025 |
| Azia AL Rabee Trading Limited | Wholesale & retail | 2025 |
| Azim Sealants Ltd | Construction | 2026 |
| Azimut Alliance PC | | 2018 |
| Aziz Trends & Textiles Ltd | Wholesale & retail | 2021 |
| Azizza Ltd | Hospitality | 2015 |
| AZJ Agricultural Chymistry (France) Ltd | Extraterritorial | 2019 |
| Azlaan Foods Ltd | Hospitality | 2018 |
| AZM for Business Ltd | Wholesale & retail | 2025 |
| Azmir Retail Ltd | Wholesale & retail | 2026 |
| Azmon Solutions Limited | Wholesale & retail | 2017 |
| Azon Labs Limited | Information & communication | 2023 |
| Azono Solutions Ltd | Administrative & support | 2020 |
| Azorn Global PC | | 2018 |
| Azrin Optics Ltd | Wholesale & retail | 2024 |
| AZS Foods Ltd | Hospitality | 2023 |
| AZT Consulting Ltd | Administrative & support | 2016 |
| Azteca Imports Limited | Wholesale & retail | 2018 |
| Aztech Media Ltd | Information & communication | 2017 |
| Aztecs Landscapers Ltd | Wholesale & retail | 2021 |
| Aztek Engineering Limited | Professional & scientific | 2012 |
| AZUR1 Ltd | Other services | 2025 |
| Azura Nights Ltd | Real estate | 2021 |
| Azure Financial Consulting Limited | Professional & scientific | 2016 |
| Azure Group UK Holdings Limited | Financial services | 2025 |
| Azure Jura Ltd | Other services | 2023 |
| Azure Luxe Ltd | Real estate | 2024 |
| Azure Peak Apparel Limited | Wholesale & retail | 2026 |
| Azure Pinnacle Properties Ltd | Real estate | 2024 |
| Azure Rental Property Ltd | Real estate | 2024 |
| Azures Capital Limited | Information & communication | 2025 |
| Azurion Advertising Limited | Professional & scientific | 2025 |
| Azurion Limited | Wholesale & retail | 2025 |
| Azurite Consultancy Ltd | Financial services | 2022 |
| Azuro Titan Ltd | Wholesale & retail | 2025 |
| Azymus Capital Ltd | Financial services | 2019 |
| AZZ Wellness Ltd | Other services | 2025 |
| Azzurra Retail Ltd | Wholesale & retail | 2013 |
| Azzurri Designs Limited | Information & communication | 2015 |
| B & a M Limited | Education | 2012 |
| B & B Cole Limited | Professional & scientific | 2016 |
| B & B Industrial Doors (UK) Limited | Manufacturing | 2010 |
| B & B Newsagents Limited | Wholesale & retail | 2014 |
| B & E Holdings Limited | Financial services | 2025 |
| B & K Future Limited | Construction | 2016 |