| Aurum Loop Ltd | Wholesale & retail | 2025 |
| Aurum Pension Trustees Limited | Financial services | 2014 |
| AURUM92 Ltd | Wholesale & retail | 2025 |
| Ausden Clark Holdings Limited | Financial services | 2023 |
| Ausden Clark Limited | Wholesale & retail | 1972 |
| Aussie International Education Ltd | Professional & scientific | 2019 |
| Austen George Holdings Limited | Real estate | 2004 |
| Austen George Trading Limited | Real estate | 1996 |
| Austen Myers Limited | Professional & scientific | 2000 |
| Austin Beaumont Ltd | Real estate | 2025 |
| Austin Eco Electrical Limited | Construction | 2025 |
| Austin Resources (Healthcare) Ltd | Administrative & support | 2013 |
| Austin Resources Care Services Limited | Health & social care | 2023 |
| Austin Resources Limited | Health & social care | 2010 |
| Austin Saunders Property Development Limited | Real estate | 2002 |
| Austin Watts Holdings Limited | Professional & scientific | 2025 |
| Austinbodhitrading Ltd | Wholesale & retail | 2024 |
| Authentic Barber Shop Limited | Other services | 2025 |
| Authentic Kare Company Limited | Health & social care | 2014 |
| Authenticated Ltd | Wholesale & retail | 2024 |
| Authentid Ltd | Information & communication | 2023 |
| Authentique Traders Ltd | Wholesale & retail | 2022 |
| Auto Acquire Ltd | Professional & scientific | 2026 |
| Auto Body Professionals Club Limited | Professional & scientific | 2004 |
| Auto Cosmetics (Leics) Ltd | Wholesale & retail | 2014 |
| Auto Czesci Limited | Wholesale & retail | 2025 |
| Auto Drive 1 Limited | Administrative & support | 2026 |
| Auto Exporter Ltd | Wholesale & retail | 2016 |
| Auto Exports Global Ltd | Wholesale & retail | 2020 |
| Auto Gara Constructions Limited | Construction | 2026 |
| Auto Harry Limited | Wholesale & retail | 2013 |
| Auto Hub (Japan) Limited | Wholesale & retail | 2024 |
| Auto Investments UK (Aiuk) Limited | Wholesale & retail | 2013 |
| Auto KIT International Ltd | Wholesale & retail | 2000 |
| Auto Locksmith Leicester Limited | Wholesale & retail | 2025 |
| Auto Locksmith Limited | Professional & scientific | 2009 |
| Auto Nest Leicester Ltd | Wholesale & retail | 2025 |
| Auto Obsession Limited | Wholesale & retail | 2013 |
| Auto Plus Motors Ltd | Wholesale & retail | 2017 |
| Auto Refurbishment Limited | Wholesale & retail | 2001 |
| Auto Revive Leicester Limited | Wholesale & retail | 2025 |
| Auto Select Leicester Ltd | Wholesale & retail | 2018 |
| Auto Spa Services Limited | Other services | 2019 |
| Auto Spec Dent Remover Ltd | Wholesale & retail | 2023 |
| Auto Touch UK Limited | Wholesale & retail | 2010 |
| Auto Washes Ltd | Administrative & support | 2022 |
| Auto-Club Hire Ltd | Wholesale & retail | 2025 |
| Auto-Tec (Leicester) Ltd | Wholesale & retail | 2000 |
| Autobahn Transport Ltd | Transport & logistics | 2024 |
| Autobay Ltd | Wholesale & retail | 2023 |
| Autocare & Tyres Ltd | Wholesale & retail | 2022 |
| Autofaders Ltd | Other services | 2026 |
| Autofection Ltd | Wholesale & retail | 2019 |
| Autofix Leicester Limited | Wholesale & retail | 2016 |
| Autofortrade Ltd | Wholesale & retail | 2019 |
| Autogloss Limited | Administrative & support | 2025 |
| Autohaus Leicester Ltd | Wholesale & retail | 2023 |
| Autolink Experts Ltd | Professional & scientific | 2025 |
| Automafh Limited | Education | 2024 |
| Automation and Robotic Technology Ltd | Manufacturing | 2019 |
| Automax 13 Ltd | Wholesale & retail | 2021 |
| Automotion Car Care Ltd | Wholesale & retail | 2014 |
| Automotive Distribution Services Ltd | Wholesale & retail | 2014 |
| Automotive Goods Remarketing Ltd | Wholesale & retail | 2023 |
| Automotive Group Ltd | Wholesale & retail | 2019 |
| Automotive Retention Group Holdings Ltd | Financial services | 2025 |
| Automotive Strategy Ltd. | Administrative & support | 1998 |
| Automoto Leicester Ltd. | Wholesale & retail | 2014 |
| Autonomous Enterprises Limited | Information & communication | 2022 |
| Autonomy Rentals Ltd | Administrative & support | 2024 |
| AUTOPARTS4LESS Ltd | Transport & logistics | 2019 |
| Autoranch Ltd | Wholesale & retail | 2023 |
| Autoright International Ltd | Professional & scientific | 2026 |
| Autoroofs Automotive Ltd | Wholesale & retail | 2013 |
| Autosigns Limited | Professional & scientific | 2010 |
| Autostore Ltd | Professional & scientific | 2001 |
| Autotech Motor Services Limited | Wholesale & retail | 2011 |
| Autotech Partner System Ltd | Information & communication | 2025 |
| Autotechnik (Leicester) Limited | Wholesale & retail | 2011 |
| Autovelocita Racing Limited | Arts & recreation | 2018 |
| Autoville Global Limited | Wholesale & retail | 2022 |
| Autovive Motors Ltd | Wholesale & retail | 2026 |
| Autoworks Storage Limited | Real estate | 2026 |
| Autoworx Nuneaton Ltd | Wholesale & retail | 2023 |
| Autozone International Ltd | Wholesale & retail | 2026 |
| Autum Management Limited | Extraterritorial | 2017 |
| Autumn Consulting Group Ltd | Real estate | 2025 |
| Autumn Legal Limited | Professional & scientific | 2024 |
| Autumn Memorials Limited | Other services | 2015 |
| Autumn Moore Consultancy Limited | Wholesale & retail | 2015 |
| Autumn Trail Limited | Real estate | 2025 |
| AUZ Investments Limited | Real estate | 2019 |
| Auzoni Limited | Health & social care | 2023 |
| AV Capital Management Limited | Wholesale & retail | 2020 |
| AV Corporation Ltd | Manufacturing | 2023 |
| AV Cultural Forum Ltd | Administrative & support | 2017 |
| AV Division Limited | Manufacturing | 2022 |
| AV Gupta Limited | Professional & scientific | 2016 |
| AV Hairdressers Ltd | Other services | 2021 |
| AV Homes Decore Ltd | Construction | 2026 |