| Aventa Homes Ltd | Real estate | 2026 |
| AVER8 Ltd | Hospitality | 2026 |
| Averis Comercial and Residential Property Services Ltd | Administrative & support | 2026 |
| Avex Corporation Limited | Construction | 2005 |
| Aviation TLC Service Ltd | Manufacturing | 2024 |
| Avit Limited | Other services | 2021 |
| Avlik Modern Structure Limited | Other services | 2020 |
| Avlik Properties Limited | Real estate | 2025 |
| Avon Coaches (Essex) Ltd | Transport & logistics | 2019 |
| Avon Development Service Ltd | Construction | 2022 |
| Avonfoil Limited | Real estate | 1999 |
| Avraam Real Estate Limited | Real estate | 2012 |
| AVS Properties Limited | Real estate | 2009 |
| Avtech Cinemas Ltd | Information & communication | 2019 |
| Avtradinggroup Limited | Wholesale & retail | 2026 |
| Avuro Ltd | Manufacturing | 2018 |
| Avuro Motors Ltd | Wholesale & retail | 2018 |
| AVY Access Mortgages Limited | Financial services | 2026 |
| AW Electrical Suppliers Ltd | Wholesale & retail | 2023 |
| Awanle I.E. Ltd | Administrative & support | 2014 |
| AWN Consulting Ltd | Professional & scientific | 2022 |
| Aworldpress International Cooperation Limited | Information & communication | 2020 |
| Awrah Protection Ltd | Administrative & support | 2025 |
| AX Electrical Contractor Ltd | Other services | 2018 |
| Axenca Ltd | Administrative & support | 2025 |
| Axiora Living Ltd | Wholesale & retail | 2026 |
| Axis Counselling & Therapy Ltd | Health & social care | 2025 |
| AXIS60 Ltd | Professional & scientific | 2026 |
| Axium PAY Limited | Professional & scientific | 2026 |
| AXN Legal Services Ltd | Professional & scientific | 2025 |
| Axsa Ltd | Transport & logistics | 2024 |
| AY 27 Ltd | Hospitality | 2026 |
| AY Kardesler UK Ltd | Transport & logistics | 2016 |
| AY Meats Ltd | Wholesale & retail | 2013 |
| AY Yildiz Cafe Limited | Hospitality | 2022 |
| Ay-Er UK Ltd | Transport & logistics | 2021 |
| AY1 Investments Ltd | Real estate | 2026 |
| AYA & Emotion Reformer Pilates Ltd | Health & social care | 2025 |
| AYA 2024 Investment Ltd | Real estate | 2024 |
| AYA Moire Limited | Manufacturing | 2021 |
| AYA Retail Ltd | Extraterritorial | 2022 |
| AYA Yildiz Ltd | Wholesale & retail | 2025 |
| Ayali Consultancy Ltd | Administrative & support | 2010 |
| Ayathai Travel UK Limited | Administrative & support | 2010 |
| Ayaz BEY Ltd | Administrative & support | 2022 |
| Ayaz Jewellery Ltd | Wholesale & retail | 2013 |
| Ayaz MOT Limited | Wholesale & retail | 2020 |
| Ayaz Wholesaler Ltd | Wholesale & retail | 2015 |
| Aycan Ltd | Wholesale & retail | 2024 |
| AYD Engineering Ltd | Professional & scientific | 2019 |
| AYD Property Investment Ltd | Real estate | 2024 |
| Aydemir Property Ltd | Real estate | 2025 |
| Aydin Aesthetics Ltd | Administrative & support | 2025 |
| Ayed Eden Limited | Real estate | 2013 |
| Aygun & Lavin Property Ltd | Real estate | 2021 |
| Aygun Construction Ltd | Construction | 2024 |
| Aygun Consultancy Ltd | Professional & scientific | 2026 |
| Ayira Aesthetics Limited | Other services | 2024 |
| Ayla Developments UK Ltd | Real estate | 2026 |
| Aymir Limited | Real estate | 2022 |
| AYO Financial Limited | Professional & scientific | 2020 |
| AYT Trade Ltd | Construction | 2020 |
| Aytun Property Services Ltd | Real estate | 2024 |
| AYU Caring Physio Limited | Health & social care | 2025 |
| Ayşe Zerya Ltd Limited | Real estate | 2025 |
| Azac Properties Limited | Real estate | 2009 |
| Azad Property Management Ltd | Extraterritorial | 2017 |
| Azad Store Ltd | Wholesale & retail | 2016 |
| Azafoun Services Limited | Other services | 2025 |
| Azalas Limited | Health & social care | 2012 |
| Azeeshops Ltd | Wholesale & retail | 2024 |
| Azelea Limited | Professional & scientific | 2019 |
| Azelia's Earth Ltd | Wholesale & retail | 2019 |
| Azelle E8 Limited | Hospitality | 2026 |
| Azelle Investments Limited | Real estate | 2023 |
| Azelle Limited | Construction | 2023 |
| Azis Cleaning Limited | Administrative & support | 2024 |
| Aziz Butchers Equipment Ltd | Wholesale & retail | 2023 |
| Azman Food Company Limited | Hospitality | 2023 |
| Azmo Services Limited | Administrative & support | 2025 |
| AZS Finance Ltd | Financial services | 2021 |
| Azul Creative MDS Ltd | Professional & scientific | 2021 |
| Azurit Limited | Hospitality | 2020 |
| B & a Barbers Ltd | Other services | 2021 |
| B & B Grill Ltd | Hospitality | 2026 |
| B & N Motors Limited | Wholesale & retail | 2018 |
| B & S Maintenance Limited | Construction | 2016 |
| B & U Property Ltd | Real estate | 2022 |
| B & Y Wholesale Ltd | Wholesale & retail | 2017 |
| B ALL One Consulting Limited | Professional & scientific | 2011 |
| B Barbers Ltd | Health & social care | 2012 |
| B C Jones Kitchens Ltd | Construction | 2020 |
| B Master Services Limited | Administrative & support | 2017 |
| B Mrozi & Sons Ltd | Real estate | 2024 |
| B Solak Limited | Real estate | 2022 |
| B&B London Construction Ltd | Construction | 2015 |
| B&F Builders Ltd | Construction | 2026 |
| B&H Breakfast Bar Ltd | Hospitality | 2025 |
| B&M Electrical Ltd | Construction | 2023 |
| B'Event Ltd | Wholesale & retail | 2020 |