| AAM Contract Solutions Ltd | Slough | 2025 |
| AAM Engineering Limited | Stockton On Tees | 2010 |
| AAM Global Ltd | London | 2025 |
| AAM Holdings | Taunton | 2015 |
| AAM Horizons Ltd | Bishop'S Stortford | 2016 |
| AAM IT Solutions Ltd | Warrington | 2026 |
| AAM Management Consulting | Taunton | 2024 |
| AAM Specialists Ltd | Birmingham | 2024 |
| Aama Financial Consultancy Services Limited | Leicester | 2011 |
| Aamaal & Co Limited | Luton | 2021 |
| Aamana Ltd | London | 2015 |
| Aamarni Multiservices Ltd | Rainham | 2022 |
| Aamax Consultants Limited | Ruislip | 2016 |
| Aame Consultants Ltd | London | 2021 |
| Aamen Ltd | Belfast | 2023 |
| Aamer & Co. Architectural Designs Ltd | Manchester | 2025 |
| Aamg Professional Services Ltd | Enfield | 2023 |
| Aamir Design Limited | Liverpool | 1993 |
| Aamna Asad Limited | Solihull | 2025 |
| Aamo Wood Consulting Limited | Epping | 2006 |
| Aamplyfi Ltd | Petersfield | 2022 |
| Aams Accountants Ltd | Manchester | 2015 |
| Aamtec Limited | Ipswich | 2007 |
| Aamyr Limited | Harrow | 2024 |
| AAN Consultants Ltd | Hounslow | 2026 |
| AAN4 Limited | West Midlands | 2024 |
| Aanchor Consulting Ltd | London | 2024 |
| Aandawealthsolutions Ltd | London | 2025 |
| Aandostudio Projects Ltd | London | 2026 |
| Aandr Terravers Ltd | Ashford | 2025 |
| Aandw Consultants Ltd | Harrogate | 2019 |
| Aandylanguages Ltd | Bolton | 2020 |
| Aanekcom Limited | London | 2025 |
| Aanja Management Services Ltd | Watford | 2020 |
| Aannoo Limited | Halifax | 2012 |
| Aano Ltd | Winsford | 2023 |
| Aanonxe Limited | Newbury | 2003 |
| Aantzz Limited | Purley | 2010 |
| Aanya Accountancy Ltd | Bushey | 2025 |
| Aanya Network Limited | Reading | 2010 |
| Aanya SIA Consultancy Ltd | Manchester | 2019 |
| AAO Consulting Limited | Brighton | 2024 |
| AAO Management Ltd | London | 2022 |
| AAO Services Limited | Basildon | 2022 |
| AAO. AA Services Limited | Fitzrovia | 2023 |
| Aaop Ltd | Harrogate | 2023 |
| AAP Accounting & Bookkeeping Ltd | Guildford | 2015 |
| AAP Accounting and Financial Consultancy Limited | Dewsbury | 2014 |
| AAP Ashva Limited | Croydon | 2022 |
| AAP Consulting Ltd | London | 2026 |
| AAP Employee Ownership Trustee Ltd | London | 2023 |
| AAP Group Ltd | March | 2020 |
| AAP Holdings Limited | Washington | 1996 |
| AAP Kingston Ltd | Bracknell | 2017 |
| AAP Management Ltd | Stratford-Upon-Avon | 2018 |
| AAP Neptun Limited | London | 2016 |
| AAP Prime Ltd | Warrington | 2019 |
| AAP Ventures Ltd. | Southport | 2014 |
| Aapat Ltd | Northwood | 2018 |
| Aapex Accounting Ltd | Saxmundham | 2025 |
| Aapg - Europe Trading Limited | London | 2009 |
| Aapharm Data Ltd | Manchester | 2025 |
| Aapni Languages Limited | Chigwell | 2012 |
| Aapv Group Ltd | Dundee | 2025 |
| Aapy Management Systems Ltd | Bilston | 2024 |
| AAQ Global Limited | Leicester | 2019 |
| AAQ Law Ltd | Huddersfield | 2026 |
| Aaqa's Ltd | Ilford | 2016 |
| AAR Associates Limited | Birmingham | 2010 |
| AAR Consultancy Management Limited | Bradford | 2023 |
| AAR Consulting Limited | Maidenhead | 2022 |
| AAR DE Production Ltd | Harrow | 2016 |
| AAR Design Services Ltd | Saltburn-By-The-Sea | 2014 |
| AAR EOT Trustee Limited | London | 2019 |
| AAR Group Ltd | Cardiff | 2016 |
| AAR Holdings Limited | London | 1998 |
| AAR Management Ltd | Cardiff | 2016 |
| AAR Marketing Ltd | Liverpool | 2026 |
| AAR Project Controls Ltd | London | 2026 |
| AAR Services Limited | London | 1975 |
| Aara Consultancy Ltd | High Wycombe | 2026 |
| Aara Creative Studios Limited | Reading | 2024 |
| Aara Trading Ltd | Leicester | 2026 |
| Aaraj Accounting Services Limited | Ilford | 2016 |
| Aarambha Tech Limited | Bristol | 2024 |
| Aaran 1 Engineering Limited | Leicester | 2018 |
| Aarani Jones Ltd | Birmingham | 2025 |
| Aaratech Ltd | Aylesford | 2026 |
| Aarathan Consulting Ltd | Bristol | 2024 |
| Aarav Associates Limited | Pinner | 2013 |
| Aarav GAS and Heating Ltd | Southall | 2023 |
| Aarav Shah Pharma Limited | Reading | 2022 |
| Aarava Ltd | Cobham | 2019 |
| Aaravee Consultancy Limited | Leicester | 2025 |
| Aaravpusloori Ltd | Crawley | 2022 |
| Aarburg Partners Ltd | London | 2025 |
| Aarchim Ltd | London | 2026 |
| Aarckle Associates Limited | Loughton | 2013 |
| Aarco Nominees Limited | Chester | 1994 |
| Aarco Services Limited | Chester | 1994 |