| Audigah Tapiwa Ltd | Health & social care | 2015 |
| Audio Boffins Ltd | Wholesale & retail | 2014 |
| Audio Suite Limited | Wholesale & retail | 1999 |
| Audioco Ltd | Construction | 2025 |
| Audley House Management (Peterborough) Limited | Households | 1982 |
| Audley West Group Ltd | Information & communication | 2025 |
| Audriaus Limited | Transport & logistics | 2017 |
| Audrius Driver Ltd | Transport & logistics | 2018 |
| Audriusp Ltd | Transport & logistics | 2019 |
| Augur Developments Limited | Real estate | 2020 |
| Augusta Care Limited | Health & social care | 1998 |
| Augustus Thaumaturge Limited | Real estate | 2020 |
| Augustynowicz & Bajkowski LLP | | 2023 |
| Auinta Ltd | Information & communication | 2020 |
| Auka Edwin & Associates Ltd | Financial services | 2024 |
| Auklands Autoroute Ltd | Wholesale & retail | 2011 |
| Aura Al-Fajr Limited | Wholesale & retail | 2025 |
| Auracare Group Ltd | Health & social care | 2018 |
| Auraselflove Ltd | Manufacturing | 2025 |
| Aurea Financial Planning Limited | Financial services | 1977 |
| Aurega Ltd | Transport & logistics | 2018 |
| Aurelia Trading Company Ltd | Wholesale & retail | 2020 |
| Aurelian Global Partners Limited | Financial services | 2026 |
| Aurelium Property Group Limited | Construction | 2026 |
| Auri Transport Ltd | Transport & logistics | 2024 |
| Auris Trans Ltd | Transport & logistics | 2016 |
| Auromind Limited | Information & communication | 2026 |
| Auroora Services Ltd | Health & social care | 2022 |
| Aurora Applications LP | | 2015 |
| Aurora Cafe Ltd | Hospitality | 2025 |
| Aurora Catalyst Partners Ltd | Financial services | 2025 |
| Aussie Home Building Ltd | Construction | 2023 |
| Austen Court (Hilsea) Residents Company Limited | Households | 2011 |
| Auster Meadows (Rearsby) Residents Management Company Limited | Households | 2026 |
| Austin Achres Ltd | Wholesale & retail | 2024 |
| Austin Street Hunstanton Ltd | Households | 2025 |
| Austinpropertydevelopment Limited | Real estate | 2012 |
| Autec Holdings Limited | Financial services | 2019 |
| Autec Training Ltd | Education | 2004 |
| Auth Plus Limited | Information & communication | 2025 |
| Authorbeats Ltd | Information & communication | 2026 |
| Autism Peterborough Ltd | Education | 2014 |
| Auto 2 Go Ltd | Administrative & support | 2024 |
| Auto Body Repair (Cambs) Ltd | Wholesale & retail | 2020 |
| Auto Choice Motoring Group Ltd | Wholesale & retail | 2025 |
| Auto Color 88 Ltd | Wholesale & retail | 2024 |
| Auto MST Ltd | Transport & logistics | 2024 |
| Auto Repairs Fengate Ltd | Wholesale & retail | 2025 |
| Auto Shine Hand Car Wash & Valeting Centre Ltd | Administrative & support | 2024 |
| Auto Smart FIX Ltd | Wholesale & retail | 2022 |
| Auto Spot Automotive Ltd | Wholesale & retail | 2026 |
| Auto Trast 1 Ltd | Wholesale & retail | 2025 |
| Auto World (Peterborough) Ltd | Wholesale & retail | 2019 |
| AUTO786 Fengate Ltd | Wholesale & retail | 2024 |
| Autoautos Ltd | Transport & logistics | 2019 |
| Autobahn Vehicle Solutions Ltd | Administrative & support | 2021 |
| Autobarn Performance Limited | Wholesale & retail | 2025 |
| Autobodified Ltd | Wholesale & retail | 2025 |
| Autocar Repairs (Cambs) Ltd | Wholesale & retail | 2019 |
| Autodentstar Ltd | Wholesale & retail | 2016 |
| Autoecu Ltd | Wholesale & retail | 2022 |
| Autohaus Performance Ltd | Wholesale & retail | 2025 |
| Autoline (Cambs) Ltd | Wholesale & retail | 2025 |
| Automated Wire Bending Limited | Manufacturing | 1992 |
| Automation Consultancy Limited | Information & communication | 2004 |
| Automobile Locksmith Limited | Wholesale & retail | 2009 |
| Automotive Carparts Ltd | Wholesale & retail | 2025 |
| Automotive Storage Limited | Transport & logistics | 2020 |
| Automotive World J.N.Rauner Ltd | Wholesale & retail | 2024 |
| Autonation (Peterborough) Limited | Wholesale & retail | 2017 |
| Autonation Car Sales Ltd | Wholesale & retail | 2019 |
| Autonomy Expert Services Ltd | Professional & scientific | 2018 |
| Autonumy Ltd | Information & communication | 2025 |
| Autorama (Peterborough) Limited | Wholesale & retail | 2018 |
| Autorama Holdings Limited | Real estate | 2022 |
| Autoremedy Ltd | Wholesale & retail | 2018 |
| Autoshells Limited | Wholesale & retail | 2018 |
| Autoshine Car Wash & Valeting Ltd | Other services | 2026 |
| Autotech Peterborough Limited | Wholesale & retail | 2015 |
| Autotrader Peterborough Ltd | Wholesale & retail | 2025 |
| Autumn Endeavours Ltd | Hospitality | 2020 |
| AV Cleans Ltd | Other services | 2022 |
| AV Development Solutions Ltd | Information & communication | 2021 |
| AV Global Holdings Ltd | Transport & logistics | 2026 |
| AV Home Ventures Limited | Real estate | 2024 |
| AV6 Ltd | Real estate | 2022 |
| AVA Shop Ltd | Wholesale & retail | 2025 |
| AVA UK Estates Ltd | Real estate | 2026 |
| Avair Limited | Transport & logistics | 2017 |
| Avalance Digital Limited | Wholesale & retail | 2024 |
| Avalon Fresh Limited | Wholesale & retail | 1993 |
| Avalon Inspired Ltd | Hospitality | 2022 |
| Avantax Ltd | Professional & scientific | 2019 |
| Avara Living Limited | Real estate | 2026 |
| Avasta Ltd | Administrative & support | 2023 |
| Avdtech Ltd | Manufacturing | 2026 |
| AVE Maria Anthony Ltd. | Real estate | 2024 |
| Aveley Lake Holdings Limited | Financial services | 2022 |
| Aveley Lakes Ltd | Construction | 2006 |
| Avenger 4X4 Ltd | Wholesale & retail | 2020 |