| Autoease Vehicle Management Limited | Wholesale & retail | 1999 |
| Autograph Homes (Bridge Farm) Limited | Construction | 2021 |
| Autograph Homes (Hambrook) Limited | Construction | 2016 |
| Autograph Homes (Meare) Limited | Construction | 2018 |
| Autograph Homes (Midland Road) Limited | Construction | 2020 |
| Autograph Homes (Norton Farm) Limited | Construction | 2021 |
| Autograph Homes (Rode) Limited | Construction | 2017 |
| Autograph Homes (Scots Lawn) Limited | Construction | 2020 |
| Autograph Homes (Stanton) Limited | Construction | 2021 |
| Autograph Homes (Totterdown) Limited | Construction | 2019 |
| Autograph Homes (Wedmore) Limited | Construction | 2026 |
| Autograph Homes (Winscombe) Limited | Construction | 2026 |
| Autograph Homes Limited | Construction | 2016 |
| Autograph Specialist Recruitment Limited | Administrative & support | 2015 |
| Autogroup South West Limited | Wholesale & retail | 2014 |
| Autohandler Ltd | Administrative & support | 2017 |
| Autohaven Bristol Ltd | Wholesale & retail | 2024 |
| Autoimmune Clinic London Ltd | Health & social care | 2018 |
| AUTOM8LABS Ltd | Information & communication | 2026 |
| Automastock Ltd | Wholesale & retail | 2019 |
| Automate Your Admin Ltd | Wholesale & retail | 2023 |
| Automated Architecture Ltd | Information & communication | 2019 |
| Automated Investment Services Ltd | Information & communication | 2003 |
| Automattaic Ltd | Wholesale & retail | 2025 |
| Automora Ltd | Information & communication | 2023 |
| Automotive Control Limited | Wholesale & retail | 2010 |
| Automotive Optics Ltd | Professional & scientific | 2023 |
| Automotive Solutions (Clifton) Limited | Wholesale & retail | 2019 |
| Autonomous (Aviation) Limited | Real estate | 2021 |
| Autonomous Business Solutions Limited | Financial services | 2017 |
| Autonomous Investments (Developments) Ltd | Energy | 2019 |
| Autonomous Investments (Properties) Limited | Real estate | 2020 |
| Autonomous Investments (Tangibles) Limited | Professional & scientific | 2020 |
| Autonomous Investments Holdings Limited | Financial services | 2020 |
| Autonomy Energy Limited | Information & communication | 1995 |
| Autopast Limited | Professional & scientific | 1985 |
| Autopay Technologies Ltd | Information & communication | 2017 |
| Autora Enterprises Ltd | Information & communication | 2025 |
| Autorefurb South West Ltd | Wholesale & retail | 2014 |
| Autos -Tyres Ltd | Wholesale & retail | 2019 |
| Autos Car Wash Ltd | Administrative & support | 2025 |
| Autos Centre Ltd | Wholesale & retail | 2026 |
| Autoserv Car & Bike Ltd | Wholesale & retail | 2013 |
| Autoserv Kingswood Limited | Wholesale & retail | 2024 |
| Autoshippers Limited | Transport & logistics | 2016 |
| Autospeed Servicing & MOT Limited | Wholesale & retail | 2017 |
| Autostrada Limited | Wholesale & retail | 2010 |
| Autotag Limited | Extraterritorial | 2012 |
| Autotag Trading Limited | Wholesale & retail | 2010 |
| Autotech Plus Limited | Wholesale & retail | 2011 |
| Autotek Systems Limited | Extraterritorial | 2015 |
| Autotrilogy Limited | Administrative & support | 2018 |
| Autotronic MOT Station Ltd | Wholesale & retail | 2025 |
| Autotronic Motor Services Limited | Wholesale & retail | 2020 |
| Autowerks Hybrid Limited | Wholesale & retail | 2022 |
| Autowest Delivery Ltd | Transport & logistics | 2019 |
| Autozone Vehicle Refinishing Limited | Wholesale & retail | 2002 |
| Autsera Ltd | Information & communication | 2019 |
| Autumn Brook (Yate) Management Company Limited | Households | 2015 |
| Autumn Dragon Publishing Ltd | Wholesale & retail | 2026 |
| Autumn Investments (Clifton) Ltd | Construction | 2019 |
| Autumn Years CIC | Health & social care | 2026 |
| Autumn Years Community Care Limited | Health & social care | 2023 |
| Autumn Years Friends Ltd | Health & social care | 2024 |
| Autumnbrooke Garage (Bristol) Ltd | Wholesale & retail | 2017 |
| Auty + Auty Ltd | Real estate | 2011 |
| Auxilium PPL Ltd | Construction | 2022 |
| AV Glazing Ltd | Construction | 2011 |
| AV Grib Ltd | Transport & logistics | 2020 |
| AV Joinery (Bristol) Limited | Construction | 2015 |
| AV Marketing and Project Management Limited | Administrative & support | 2015 |
| AV MG Medical Limited | Health & social care | 2020 |
| AV Wardrobes Limited | Manufacturing | 2021 |
| AVA Construction Solution Ltd | Construction | 2024 |
| Avaia Technologies Limited | Professional & scientific | 2016 |
| Availability Lets Limited | Real estate | 2020 |
| Avalana Design Limited | Professional & scientific | 2021 |
| Avalanche Academy Ltd | Arts & recreation | 2011 |
| Avalanche Digital Limited | Information & communication | 2012 |
| Avale Intl Ltd | Wholesale & retail | 2024 |
| Avaley Solutions Limited | Administrative & support | 2021 |
| Avalis Glacier Water Ltd | Wholesale & retail | 2022 |
| Avalon Accountancy Limited | Professional & scientific | 2025 |
| Avalon Assessments Limited | Education | 2006 |
| Avalon Associates Ltd | Professional & scientific | 2025 |
| Avalon Design Limited | Professional & scientific | 2024 |
| Avalon Grove Management Company Limited | Households | 2026 |
| Avalon House Management Company Limited(The) | Households | 1985 |
| Avalon Innovation Group Limited | Financial services | 2023 |
| Avana Coffee Ltd | Hospitality | 2024 |
| Avana Lounge Limited | Hospitality | 2019 |
| Avanc Ltd | Manufacturing | 2025 |
| Avania UK Ltd | Professional & scientific | 2020 |
| Avanico Consulting Ltd | Professional & scientific | 2025 |
| Avantage Group Limited | Information & communication | 2022 |
| Avanti Automotive Limited | Wholesale & retail | 2017 |
| Avanti Hygiene Limited | Administrative & support | 2012 |
| Avanti Investments Ltd | Financial services | 2025 |
| Avanti Project Solutions Ltd | Manufacturing | 2019 |
| Avanti Property Investments Limited | Real estate | 2024 |