| A9 Engineering Ltd | Benfleet | 2011 |
| A9, 89-95 Oldham Street Limited | Manchester | 2015 |
| A9APA Limited | West Yorkshire | 2007 |
| A9K Media Limited | Spalding | 2022 |
| A:B Studio Chartered Architects Ltd | Glasgow | 2014 |
| A@G Ltd | Sheringham | 2020 |
| AA & Associates Ltd | Walsall | 2024 |
| AA & Co Consultants Limited | London | 2024 |
| AA & FA Newco 1 Limited | Southampton | 2020 |
| AA & GA Archer Building Consultancy Ltd | Reigate | 2014 |
| AA & MA Khan Ltd | Bradford | 2022 |
| AA & R Certified Accountants Limited | Abbots Langley | 2021 |
| AA & R Financial Atelier Limited | London | 2025 |
| AA & T Consulting Services Ltd | Maidstone | 2023 |
| AA 2000 Limited | Hove | 1997 |
| AA Access Consult Ltd | London | 2003 |
| AA Account & Consult Ltd | Leicester | 2023 |
| AA Accountancy (Midlands) Ltd | Tipton | 2018 |
| AA Accountancy and Info Management Services Ltd | Harrow | 2004 |
| AA Accountancy Ltd | Bembridge | 2006 |
| AA Accountancy Services (London) Limited | London | 2013 |
| AA Accountancy Services (Southgate) Ltd | London | 2020 |
| AA Accountancy Services (UK) Limited | London | 2006 |
| AA Accountants (GBR) Ltd | London | 2024 |
| AA Accountants (UK) Ltd | Bristol | 2009 |
| AA Accountants Ltd | Peterborough | 2007 |
| AA Accountants South Limited | Reading | 2014 |
| AA Accountax Ltd | Blackburn | 2019 |
| AA Accounting & Financial Services Ltd | Croydon | 2025 |
| AA Accounting Ltd | Falkirk | 2022 |
| AA Accounting Service Limited | London | 2008 |
| AA Accounting Solutions Ltd | Ilford | 2009 |
| AA Accounts Ltd | London | 2021 |
| AA Acquisition Co Limited | Basingstoke | 2004 |
| AA Advisors Limited | Ilford | 2025 |
| AA Advisory Group Ltd | London | 2026 |
| AA Advisory Ltd | London | 2018 |
| AA Animal Healthcare Ltd | London | 2026 |
| AA Artelier Limited | London | 2024 |
| AA Associates 786 Ltd | Birmingham | 2024 |
| AA Associates Ltd | Carshalton | 2019 |
| AA Associates Management Limited | Ilford | 2024 |
| AA Associates Solutions Ltd | Rainham | 2022 |
| AA Associates Umbrella Limited | Ilford | 2020 |
| AA Book-Keeping & Pay-Roll Limited | London | 2001 |
| AA Bookkeepers Ltd | London | 2018 |
| AA Bookkeeping and Payroll Solutions Ltd | Crawley | 2017 |
| AA Bookkeeping, Payroll and Business Support Limited | Morecambe | 2016 |
| AA Brand Management Limited | Basingstoke | 2013 |
| AA Builders Limited | London | 1992 |
| AA Business Consultancy Nationwide Ltd | High Wycombe | 2022 |
| AA Business Management Solutions Ltd. | Barking | 2012 |
| AA Business Solutions Limited | Huddersfield | 2003 |
| AA Capture Co Ltd | London | 2024 |
| AA Care Compliance and Trainings Ltd | Birmingham | 2018 |
| AA Certification Limited | Bath | 2013 |
| AA Chiropractic Ltd | Cardiff | 2023 |
| AA Claims Ltd | Peterborough | 2004 |
| AA Clinical Limited | Didcot | 2020 |
| AA Complete Home Services Ltd | Shenley | 2025 |
| AA Compliance Compass Ltd | Matlock | 2026 |
| AA Construction Support Solutions Limited | Barnsley | 2018 |
| AA Consult Ltd | Paisley | 2026 |
| AA Consultacy Limited | Wirral | 2008 |
| AA Consultancy (London) Limited | Leicester | 2017 |
| AA Consultancy Leeds Limited | Leeds | 2019 |
| AA Consultancy Services Ltd | Southall | 2024 |
| AA Consultants (NW) Ltd | Bolton | 2019 |
| AA Consultants Kent Ltd | Margate | 2015 |
| AA Consultants Ltd | Ashford | 2025 |
| AA Consulting Services Ltd | London | 2021 |
| AA Consulting Solutions Ltd | Rochdale | 2018 |
| AA Corporation Limited | Basingstoke | 1999 |
| AA Criminal Defence Ltd | Wakefield | 2015 |
| AA Defence Limited | South Croydon | 2013 |
| AA Design Associates Ltd | High Wycombe | 2021 |
| AA Design Group Ltd | Bradford | 2024 |
| AA Design Interiors Ltd | London | 2024 |
| AA Design Solutions Limited | London | 2012 |
| AA Design Studio Limited | Coventry | 2025 |
| AA Designworks Ltd | Leigh-On-Sea | 2016 |
| AA Digital Limited | Sevenoaks | 2019 |
| AA Dog Rescue Animal Angels Veterinary Clinic | Maldon | 2023 |
| AA Drafting Plus Ltd | London | 2024 |
| AA Drafting Solutions Ltd | London | 2012 |
| AA Electric & Electronic Services Ltd | London | 2020 |
| AA Electrical (UK) Limited | Leicester | 2014 |
| AA ENG Platform Ltd | Slough | 2025 |
| AA Engineering Improvements Ltd | Prenton | 2019 |
| AA Engineering Solution Ltd | Ruislip | 2023 |
| AA Engineers & Surveyors Ltd | Harrow | 2021 |
| AA Enviro Limited | Glasgow | 2011 |
| AA Environmental Limited | Shippon | 2013 |
| AA Estate Management Consultancy Ltd | London | 2024 |
| AA Everyday Accounting Services Ltd | Woking | 2014 |
| AA Finance Consultancy Ltd | St. Helens | 2020 |
| AA Financial Business Services Ltd | Solihull | 2019 |
| AA Food Safety Limited | Derby | 2024 |
| AA Foxfield Consulting Ltd | Bath | 2023 |
| AA Frost Ltd | London | 2018 |