| Autopoint (Birmingham) Limited | Wholesale & retail | 1992 |
| Autoprime Ltd | Wholesale & retail | 2022 |
| AUTORENT24 Ltd | Wholesale & retail | 2019 |
| Autoreviver Ltd | Wholesale & retail | 2025 |
| Autoride Ltd | Wholesale & retail | 2020 |
| Autorush Ltd | Wholesale & retail | 2016 |
| Autos Craft Ltd | Wholesale & retail | 2024 |
| Autos Service Ltd | Wholesale & retail | 2025 |
| Autoscope Fleet Installations Ltd | Wholesale & retail | 2024 |
| AUTOSOLUTIONS90 Ltd | Manufacturing | 2025 |
| Autospin(Oil Seals)Limited | Manufacturing | 1975 |
| Autostaffing Ltd | Administrative & support | 2025 |
| Autostores Motor Factors Limited | Wholesale & retail | 1989 |
| Autostructures UK Limited | Manufacturing | 1958 |
| Autosupplies (Chesterfield) Limited | Wholesale & retail | 1990 |
| Autosupplies (Holdings) Limited | Financial services | 2025 |
| Autotechnik Holdings Limited | Financial services | 2019 |
| Autotechnika Ltd | Wholesale & retail | 2023 |
| Autotrade (Birmingham) Ltd | Wholesale & retail | 2014 |
| Autotradinghub Ltd | Wholesale & retail | 2025 |
| Autotrim Studio Ltd | Wholesale & retail | 2024 |
| Autotyre Ltd | Wholesale & retail | 2019 |
| Autovinz Limited | Wholesale & retail | 2006 |
| Autovizz Ltd | Wholesale & retail | 2025 |
| Autowise Auto Factors Limited | Wholesale & retail | 2016 |
| Autozone Limited | Wholesale & retail | 1993 |
| Autozonecars Ltd | Wholesale & retail | 2024 |
| Autumn Leaf Home Designs Limited | Construction | 2019 |
| Autumn Leaf Interiors Ltd | Construction | 2026 |
| Autumn Orange Ltd | Hospitality | 2023 |
| Autumn Origins Limited | Wholesale & retail | 2025 |
| Autumn Pari Ltd | Real estate | 2026 |
| Autumn Rose Hair & Beauty Ltd | Other services | 2021 |
| AUX Aide Ltd | Administrative & support | 2024 |
| Auxano Birmingham Limited | Professional & scientific | 2021 |
| Auxeum UK Ltd | Health & social care | 2026 |
| Auxiliary & Management Services Ltd | Administrative & support | 2022 |
| Auxiliary Solution Ltd | Wholesale & retail | 2026 |
| Auxilio Care Limited | Health & social care | 2015 |
| Auxilio Holdings Limited | Health & social care | 2013 |
| Auxilio Housing Limited | Health & social care | 2015 |
| Auxilium Equity Limited | Financial services | 2023 |
| Auxilium NO 2 Ltd | Professional & scientific | 2023 |
| Auxillia Enterprises Ltd | Hospitality | 2017 |
| Auxira Consulting Ltd | Professional & scientific | 2026 |
| Auxmin Consultancy Services Limited | Information & communication | 2016 |
| Auxmin Limited | Information & communication | 2015 |
| Auxmon Limited | Real estate | 2023 |
| Auxo Investments Limited | Real estate | 2026 |
| AUY Limited | Wholesale & retail | 2024 |
| AV Fraija Ltd | Information & communication | 2025 |
| AV Infotech Ltd | Information & communication | 2013 |
| AV Invest Ltd | Real estate | 2019 |
| AV Locum Limited | Health & social care | 2021 |
| AV Logictics Ltd | Transport & logistics | 2025 |
| AV Logistics Group Ltd | Transport & logistics | 2025 |
| AV Smile Ltd | Health & social care | 2018 |
| AV Tech Ltd | Information & communication | 2022 |
| AV Technology Ltd | Wholesale & retail | 2025 |
| Av-Me Property Limited | Real estate | 2023 |
| AVA Parking Group Ltd | Administrative & support | 2025 |
| AVA Parking Southampton Ltd | Other services | 2024 |
| AVA Property Group Ltd | Real estate | 2021 |
| AVA Smile Limited | Health & social care | 2018 |
| AVA Solicitors Ltd | Professional & scientific | 2019 |
| Avail AI Ltd | Information & communication | 2018 |
| Avail IT Ltd | Information & communication | 2026 |
| Avalanche Outbound Ltd | Professional & scientific | 2024 |
| Avalon Care Limited | Administrative & support | 2023 |
| Avalon Hire Limited | Administrative & support | 2018 |
| Avalon Medical Support Services Ltd | Health & social care | 2015 |
| Avam Properties Limited | Health & social care | 2018 |
| Avangelion Limited | Professional & scientific | 2025 |
| Avant-Garde Housing Limited | Real estate | 2024 |
| Avantage Consulting Ltd | Professional & scientific | 2026 |
| Avantage Ltd | Professional & scientific | 2020 |
| Avantage Property Services Limited | Real estate | 2025 |
| Avantal Constructions Limited | Construction | 2025 |
| Avanti Garage Ltd | Wholesale & retail | 2022 |
| Avanti Lighting Limited | Other services | 2017 |
| Avanti Living Limited | Health & social care | 2026 |
| Avanti Roofing and Building Ltd | Construction | 2026 |
| Avanti Social Care Limited | Administrative & support | 2023 |
| Avantserv Limited | Other services | 2013 |
| Avar Homes Ltd | Real estate | 2025 |
| Avari Property Group Limited | Real estate | 2025 |
| Avatar Care Group Limited | Financial services | 2021 |
| Avatar Property Holdings Limited | Real estate | 2018 |
| Avatar SWH Limited | Health & social care | 2021 |
| Avaya Investments Limited | Other services | 2016 |
| Avayo Limited | Other services | 2017 |
| Avbie Construction Limited | Construction | 2024 |
| AVC Holdings Ltd | Real estate | 2020 |
| AVC Properties Solution Ltd | Construction | 2024 |
| Avec Amour Ltd | Manufacturing | 2021 |
| Avecinna Academy Ltd | Education | 2009 |
| Aveer Construction Limited | Construction | 2022 |
| Aveetie Ltd | Information & communication | 2025 |
| Aveho Group Ltd | Water & waste | 2019 |
| Aveley Heights Limited | Professional & scientific | 2004 |