| A1 Motives Ltd | Petersfield | 2020 |
| A1 PAT Testing NW Ltd | Blackburn | 2023 |
| A1 Plumbing & Heating Services (Tamworth) Limited | Tamworth | 2008 |
| A1 Secure Self Storage Limited | Ashford | 2006 |
| A1 Security Automation Ltd | Hampshire | 2007 |
| A1 SEO Limited | Glasgow | 2021 |
| A1 Skip Hire Northampton Limited | Kettering | 2021 |
| A1 Sound Limited | Matlock | 2017 |
| A1 Tax Consulting Ltd | London | 2020 |
| A1 Top Soil Supplies Ltd | Belfast | 2011 |
| A1 Vipee's Limited | Wokingham | 2015 |
| A1 Wood Pelletts Ltd | Warrington | 2014 |
| A100 Plus, Asoc Prom Ingles Comercial, Mepossem, Furia Espanola Abogados Ltd | London | 2019 |
| A113 Ltd | Manchester | 2024 |
| A11Y Ltd. | London | 2012 |
| A1B2C3 Consulting Limited | Coventry | 2005 |
| A1B2C3 IT Limited | Coventry | 2005 |
| A1B2C3 Solutions Limited | Coventry | 2013 |
| A1DEN Limited | Harrogate | 2020 |
| A1EX Ltd | Harrogate | 2016 |
| A2 Car Sales Limited | Sittingbourne | 2024 |
| A2 Employee Trustee Limited | London | 2016 |
| A2 Wash Ltd | Glasgow | 2021 |
| A21 UK (Holdings) Limited | Reading | 2018 |
| A2B Builders Ltd | Hanworth | 2010 |
| A2B Cornwall Airport Limited | Truro | 2017 |
| A2B Deliveries Limited | Harrow | 2002 |
| A2B Falmouth Docks Limited | Truro | 2017 |
| A2B Falmouth Limited | Truro | 2017 |
| A2B Kernow Transport Services Limited | Truro | 2017 |
| A2B London Ltd | London | 2018 |
| A2B Patient Transport Services Cornwall Limited | Truro | 2017 |
| A2B Solutions Ltd | Newcastle Upon Tyne | 2023 |
| A2B Taxis Cornwall Limited | Truro | 2017 |
| A2B Taxis Falmouth Limited | Truro | 2017 |
| A2B Taxis Helston Limited | Truro | 2020 |
| A2B Transport Falmouth Limited | Truro | 2017 |
| A2B Transport Services Cornwall Limited | Truro | 2017 |
| A2B-AUTOCARE Limited | Cardiff | 2022 |
| A2BEE Chair Hire Limited | Leamington Spa | 2008 |
| A2D RTM Company Limited | Feltham | 2025 |
| A2SHRED Limited | Stoke Prior | 2025 |
| A2Z Hospitality Ltd | Dover | 2008 |
| A3 General Trading Company Ltd | Harrogate | 2022 |
| A3 Support Ltd | London | 2016 |
| A39 Skip Hire Limited | Newton Abbot | 2023 |
| A4 Kitchen Appliances Limited | Newbury | 2003 |
| A44 Tyre Shop Limited | Winchester | 2014 |
| A46 BM Centre Limited | Wolverhampton | 2020 |
| A4PMS Limited | Barnstaple | 2012 |
| A62 Sweden Limited | London | 2026 |
| A7ASHER Ltd | Enfield | 2022 |
| A7SPORTSWEAR Ltd | Bristol | 2019 |
| AA & BB Ltd | Romford | 2024 |
| AA 16122025 Limited | Bristol | 2010 |
| AA Accounting and Business Solutions Limited | London | 2006 |
| AA Bemanning Limited | London | 2022 |
| AA Consultancy NW Ltd | Ormskirk | 2018 |
| AA Contracting Group Ltd | Oxford | 2025 |
| AA Engineering Consultancy London Ltd | Croydon | 2016 |
| AA Group Facilities Ltd | Kidderminster | 2019 |
| AA Holdco Ltd | Ringwood | 2025 |
| AA Management Training & Consultancy Ltd | London | 2011 |
| AA Properties Investment Limited | Coventry | 2022 |
| AA Renovation West Ltd | London | 2025 |
| AA RV Limited | Basingstoke | 2010 |
| AA Serve Ltd | Barking | 2019 |
| AA Sheet Metal Work Ltd | London | 2017 |
| AA Technology Limited | Crewe | 2023 |
| AA Trademarks Limited | Bristol | 2018 |
| AA Waste Disposal Ltd | Glasgow | 2024 |
| Aa's Utilities Ltd | Ilford | 2024 |
| AA01 Ltd | New Eltham | 2012 |
| AA2014 Limited | Crewe | 2005 |
| AAA & Co (UK) Ltd | Coventry | 2017 |
| AAA Credit Ltd | Chatham | 2015 |
| AAA Ltd | London | 2009 |
| AAA Property Limited | Holmfirth | 2019 |
| AAA Sweden Limited | London | 2022 |
| Aaaaa Bolaget Pensionar OCH Livsnjutare Limited | London | 2025 |
| AAC Global Investments Ltd | London | 2021 |
| AAD Agency Limited | Stratton Audley | 2004 |
| AAE Assets Ltd | Leamington Spa | 2020 |
| AAE Management Ltd | Coventry | 2016 |
| Aaeot Limited | Gateshead | 2022 |
| Aafm Investments Limited | Glasgow | 2024 |
| Aafsa C.N.G Alliyy Limited | Chesham | 2025 |
| AAG Associates Limited | Manchester | 2023 |
| AAG Cyber Security Limited | Chesterfield | 2002 |
| AAG Homes Limited | Hadleigh | 2013 |
| AAG Settlements Limited | London | 2017 |
| AAG Traffic Management Limited | London | 2013 |
| AAH Investment Management Ltd | Loughton | 2013 |
| AAI Selby Fire Limited | York | 2022 |
| AAL Employee Ownership Trustee Limited | London | 2018 |
| AAL Management Ltd | Canvey Island | 2016 |
| Aamg Services Ltd | Edinburgh | 2016 |
| AAN Ltd | Norwich | 2024 |
| Aanda Recovery Ltd | London | 2018 |
| Aanya Properties Limited | Harrow | 2012 |