| Aurelian Lifestyle Limited | Wholesale & retail | 2017 |
| Aurelian Wellness Ltd | Wholesale & retail | 2025 |
| Aurentiq Ltd | Information & communication | 2025 |
| Aureon Levane Group Ltd | Professional & scientific | 2025 |
| Aureon Realty Ltd | Real estate | 2026 |
| Aurex Trading Ltd | Wholesale & retail | 2026 |
| Aurm Skin Ltd | Other services | 2024 |
| Aurmak Limited | Information & communication | 2026 |
| Aurum Capital Partners Ltd | Financial services | 2025 |
| Aurum X Limited | Wholesale & retail | 2025 |
| Auspira Limited | Information & communication | 2026 |
| Auto Arcade London Ltd | Wholesale & retail | 2024 |
| Auto Car Wash Slough Ltd | Administrative & support | 2023 |
| Auto MAP Experts Ltd | Wholesale & retail | 2024 |
| Auto Mobility Concepts Limited | Manufacturing | 2000 |
| Auto Monarchs Limited | Wholesale & retail | 2020 |
| Auto Trade Services LDN Limited | Wholesale & retail | 2025 |
| Auto Vault Ltd | Wholesale & retail | 2024 |
| Auto Vaydor Limited | Wholesale & retail | 2024 |
| Auto Village Slough Ltd | Manufacturing | 2019 |
| Auto Village MOT & Service Limited | Wholesale & retail | 2026 |
| Auto X Limited | Wholesale & retail | 2020 |
| Autobarn London Ltd | Wholesale & retail | 2021 |
| Autobody Technic Limited | Wholesale & retail | 2009 |
| Autocare M.O.T & Service Centre Ltd | Wholesale & retail | 2011 |
| Autogo Services Limited | Wholesale & retail | 2025 |
| Autolink Exports Limited | Wholesale & retail | 2025 |
| Autoluxe Styling Ltd | Wholesale & retail | 2024 |
| Automation First Ltd | Professional & scientific | 2018 |
| Automobile Car Sales Ltd | Wholesale & retail | 2014 |
| Automobile Services Ltd | Wholesale & retail | 2024 |
| Automotive Customs & Repairs Ltd | Wholesale & retail | 2017 |
| Automotive Leasing Limited | Administrative & support | 1985 |
| Automoto Parts Hub Ltd | Wholesale & retail | 2023 |
| Automotor Sales Ltd | Wholesale & retail | 2020 |
| Automotoz Ltd | Wholesale & retail | 2026 |
| Autopit WOW Ltd | Construction | 2024 |
| Autoprise Ltd | Wholesale & retail | 2018 |
| Autos Hub Ltd | Wholesale & retail | 2021 |
| Autospot Cars Ltd | Wholesale & retail | 2019 |
| Autotech Controls Limited | Construction | 2021 |
| Autovictrix Ltd | Information & communication | 2024 |
| Autowise Limited | Wholesale & retail | 2015 |
| Autoyism Limited | Wholesale & retail | 2024 |
| Autoz Hire Ltd | Administrative & support | 2026 |
| Autumn END Management Company Limited | Real estate | 2017 |
| AV Autocentre Slough Ltd | Wholesale & retail | 2023 |
| AV Buildcorp Ltd | Construction | 2025 |
| AV ROC Ltd | Information & communication | 2019 |
| AV UK Property Limited | Real estate | 2020 |
| AV Xpress Ltd | Transport & logistics | 2025 |
| AVA Imaging Limited | Health & social care | 2021 |
| Ava's Consultancy Services Ltd | Information & communication | 2024 |
| Ava's Hospitality Services Ltd | Hospitality | 2024 |
| Avanar Property & Consulting Ltd | Real estate | 2023 |
| Avanta Homes Ltd | Real estate | 2025 |
| Avante Live Ltd | Professional & scientific | 2022 |
| Avantis Homes Limited | Real estate | 2020 |
| Avantis Roofing and Building Limited | Administrative & support | 2023 |
| Avarati Ltd | Wholesale & retail | 2025 |
| Avavio Ltd | Administrative & support | 2015 |
| Avaya Installation Services Ltd | Information & communication | 2013 |
| AVB9 Management Limited | Real estate | 2017 |
| Avco Systems Limited | Information & communication | 1986 |
| AVE Inc Ltd | Financial services | 2025 |
| AVE Smart Homes Ltd | Construction | 2024 |
| Avencys Group Ltd | Professional & scientific | 2025 |
| Aventus Global Forwarding Ltd | Transport & logistics | 2020 |
| Aventy Limited | Information & communication | 2019 |
| Avenue Events (South) Ltd | Administrative & support | 2000 |
| Avenue Events International Limited | Extraterritorial | 2022 |
| Avenue Events Ltd | Extraterritorial | 2006 |
| Aver Investments Ltd | Real estate | 2021 |
| Averonix Capital Limited | Financial services | 2026 |
| Aves Cake and More London Ltd | Wholesale & retail | 2025 |
| Avess Property Developments Ltd | Construction | 2019 |
| Avex Turismo Ltd | Transport & logistics | 2023 |
| AVI 24/7 Ltd | Transport & logistics | 2022 |
| Aviation Management Support Limited | Transport & logistics | 1997 |
| Avib City Construction Ltd | Construction | 2020 |
| Avicenna Educators Ltd | Education | 2025 |
| Avicenna Properties Ltd | Real estate | 2010 |
| Avicon Developments Ltd | Construction | 2024 |
| Avida Studios Corporate Limited | Professional & scientific | 2023 |
| Avihs IT Consulting Limited | Information & communication | 2022 |
| Aviron Associates Limited | Professional & scientific | 2008 |
| Avis Software Consultants Limited | Information & communication | 1995 |
| Avisa Homes Ltd | Real estate | 2023 |
| Avispado Ltd | Wholesale & retail | 2015 |
| Avit Europe Limited | Transport & logistics | 2011 |
| AVJ Services Ltd | Transport & logistics | 2021 |
| Avlised Property Investments Ltd | Real estate | 2016 |
| Avlr Limited | Information & communication | 2018 |
| Avmash Properties Limited | Real estate | 2024 |
| AVO Leasing Ltd | Wholesale & retail | 2025 |
| Avon Pet Products Limited | Wholesale & retail | 2009 |
| Avonvale Distributions Ltd | Wholesale & retail | 2020 |
| AVR Tech Limited | Information & communication | 2024 |
| Avsmile Properties Ltd | Health & social care | 2020 |
| Avtej Limited | Transport & logistics | 2025 |