| Aaron Vets Limited | Nantwich | 2021 |
| Aaron Walker Associates Ltd | Preston | 2023 |
| Aaron Ware Consulting Limited | Mildenhall | 2025 |
| Aaron Whitehead Healthcare Ltd | Wetherby | 2012 |
| Aaron&Co Ltd | Milton Keynes | 2022 |
| Aaron, Chadha and Evans Ltd. | Borehamwood | 1993 |
| AARON2K Ltd | Holyhead | 2012 |
| Aaronamous Ltd | London | 2025 |
| Aarondale Accountancy Services Limited | Halifax | 1987 |
| Aarongeis.Com Ltd | Bristol | 2015 |
| Aaronom Ltd | London | 2018 |
| Aarons Consultancy Ltd | Nottingham | 2005 |
| Aarons Limited | Chester | 2003 |
| Aarp Consultantancy Ltd | London | 2024 |
| Aarp Limited | London | 2013 |
| Aarpee Consultants Limited | Bushey | 2006 |
| Aarpy Limited | Bexhill-On-Sea | 2023 |
| Aarrian Ltd | Birmingham | 2025 |
| Aarshi Associates Limited | North Harrow | 2015 |
| Aarshya Accountancy Services Limited | Chelmsford | 2019 |
| Aart Accountants Ltd | Leeds | 2023 |
| Aartee Steel Holdings Limited | Brighton | 2013 |
| Aartee Steel Operations Limited | Brighton | 2010 |
| Aartesia Ltd | Dawlish | 2016 |
| Aarthy Limited | Amersham | 2011 |
| Aarti Capitals Ltd | London | 2025 |
| Aarti Mistry Ltd | Harrow | 2020 |
| Aartius Management Solutions Limited | Belfast | 2016 |
| Aartlondon Limited | London | 2005 |
| Aarun Accountancy Limited | West Sussex | 2002 |
| Aarush Business Consultancy Ltd | Purley | 2014 |
| Aarvaan Consultancy Ltd | Harrow | 2021 |
| Aarvee Associates Limited | London | 2022 |
| Aarvi Food Safety Services Limited | Barnet | 2015 |
| Aarvi GRA Services Limited | Rickmansworth | 2018 |
| Aarvi Management Ltd | Derby | 2023 |
| Aarvigil Life Sciences Limited | Watford | 2024 |
| Aarvold Mclean Architecture Ltd | London | 2017 |
| Aarx Consultancy Limited | Reading | 2020 |
| Aary Consultancy Limited | Greenford | 2015 |
| Aarya Dhumal Limited | London | 2026 |
| Aarya Management Consulting Ltd | Reading | 2023 |
| Aarya Technologies Ltd | Winnersh, Wokingham | 2014 |
| Aaryan Services Ltd | Barnetby | 2016 |
| Aaryan Solicitors Ltd | Hayes | 2020 |
| Aaryan Trends Ltd | Bushey | 2015 |
| Aaryaved Ltd | Enfield | 2021 |
| Aaryusha Ltd | Rugby | 2024 |
| AAS & JLS Consulting Ltd | London | 2018 |
| AAS Accountants Ltd | Crowthorne | 1990 |
| AAS Accountants Northwest Ltd | Blackburn | 2025 |
| AAS Advisory Ltd | Birmingham | 2026 |
| AAS Airfield Solutions Limited | Bury St. Edmunds | 2022 |
| AAS Associates Ltd | London | 2021 |
| AAS Consult Limited | Wallington | 2012 |
| AAS Consultancy Limited | Hampshire | 2000 |
| AAS Consultancy Services Ltd | Leicester | 2019 |
| AAS Consultants Ltd | Blackburn | 2013 |
| AAS Engineering Ltd | Weybridge | 2022 |
| AAS Group Limited | Stirling | 2017 |
| AAS Management Consultants Limited | Harrow | 2008 |
| AAS Media Ltd | London | 2025 |
| AAS Pharma Ltd | Birmingham | 2017 |
| Aasa Capital Limited | London | 2011 |
| Aasaga Developments Ltd | East Molesey | 2016 |
| Aasara Interiors Ltd | Ilford | 2024 |
| Aasc Consulting Limited | Worcester | 2026 |
| Aasco Holdings Limited | Tipton | 1991 |
| Aase Architecture Limited | Southampton | 2025 |
| Aasfor Limited | Dartford | 2015 |
| Aasg & Co Limited | Dartford | 2024 |
| Aasha Consulting Ltd | London | 2024 |
| Aasha Limited | Watford | 2012 |
| Aashay Advisors Ltd | Milton Keynes | 2026 |
| Aaship'Tec Ltd | Hull | 2013 |
| Aashirvaad Private Limited | Harrow | 2022 |
| Aashrit Limited | Rugby | 2019 |
| Aashritha Consultancy Ltd | Halifax | 2011 |
| Aashvi Investments Limited | London | 2022 |
| Aasj MC Ltd | London | 2024 |
| Aasj Sports Management Ltd | Farnham | 2020 |
| Aask Consultancy Ltd | Southampton | 2024 |
| Aask Financial Ltd | Bedford | 2019 |
| Aask Surveyors Ltd | Birmingham | 2025 |
| Aasra Associates Limited | Leicester | 2021 |
| Aasra Consultancy Ltd | Hounslow | 2026 |
| Aassm Limited | London | 2018 |
| Aasta Consulting Private Limited | Harrow | 2007 |
| Aasw Ltd | Exeter | 2025 |
| AAT Accountants and Management Consultants Ltd | Birmingham | 2022 |
| AAT Architecture Limited | London | 2015 |
| AAT Construction Group Ltd | Dagenham | 2025 |
| AAT Consulting and Contracting Ltd | Stockport | 2021 |
| AAT Group Limited | Downpatrick | 2020 |
| AAT Limited | Coventry | 2008 |
| AAT Projects and Repairs Limited | Ayr | 2023 |
| AAT Projects Ltd | Widnes | 2012 |
| AAT Safety Limited | Ayr | 2020 |
| AAT Services UK Ltd | Wokingham | 2023 |
| AAT Site Operational Support Limited | Ayr | 2023 |