| Aldersey Advisers Limited | Alton | 2010 |
| Aldersgate Group Limited | Rotherwas | 2018 |
| Aldersgate House Limited | Lisburn | 2011 |
| Aldersgate ROW Ltd | Gravesend | 2015 |
| Aldershot Business Solutions Limited | Yateley | 2011 |
| Alderslade Ltd | Harpenden | 2005 |
| Alderslade Mechanical Services Ltd | Fareham | 2019 |
| Alderson a & I Limited | St Albans | 2019 |
| Alderson Aerospace Consulting Limited | Waterlooville | 2025 |
| Alderson and Co Consultants Ltd | Burgess Hill | 2023 |
| Alderson Business Growth Limited | London | 2018 |
| Alderson Catering Equipment (UK) Limited | Rotherham | 1984 |
| Alderson Consultancy and Design Services Ltd | Tranent | 2025 |
| Alderson Consulting (Bristol) Ltd | Taunton | 2018 |
| Alderson Consulting Ltd | Glossop | 2026 |
| Alderson Court Management Company Limited | Ascot | 2012 |
| Alderson Financial Consultancy Ltd | York | 2023 |
| Alderson Francis Associates Limited | Stamford Bridge | 2020 |
| Alderson Pack Consulting Ltd | London | 2026 |
| Alderson Services (Holdings) Limited | Sunderland | 2013 |
| Alderson Slater Ltd | Alresford | 2025 |
| Alderson Tax Limited | Harrogate | 2017 |
| Alderson Turner Limited | Stratford Upon Avon | 2017 |
| Alderspire Limited | Kirby Hill, Boroughbridge | 2026 |
| Alderstone Accountancy Limited | Edinburgh | 2019 |
| Alderstone Finance Ltd | Birmingham | 2026 |
| Alderstone Limited | Edinburgh | 2022 |
| Alderstone Ventures Limited | London | 2026 |
| Aldersyde Consulting Limited | Reigate | 2018 |
| Alderton Accountancy Ltd | Ilford | 2019 |
| Alderton Associates Limited | Chelmsford | 2004 |
| Alderton Consulting & Advisory Limited | Loughton | 2026 |
| Alderton Engineering Ltd | Twickenham | 2021 |
| Alderton Property Surveyors Limited | Petersfield | 2023 |
| Aldertons Accounting Services Limited | Ipswich | 2009 |
| Aldervale CLC Ltd | London | 2024 |
| Alderverum Ltd | Windsor | 2011 |
| Alderwell Ltd | Croft Warrington | 2001 |
| Alderwick James & Co Limited | Surbiton | 2002 |
| Alderwicks Consultants Limited | Cardiff | 2003 |
| Alderwills Settlements Ltd | Yateley | 2024 |
| Alderwood Consultancy Limited | Woking | 2009 |
| Alderwood Holdings Limited | Maidstone | 2007 |
| Alderwood Law Limited | Newcastle Upon Tyne | 2023 |
| Alderwood Limited | Grange-Over-Sands | 2017 |
| Alderwood Real Estate Limited | London | 2007 |
| Alderwood Solutions Limited | Newcastle Upon Tyne | 2024 |
| Aldf Services Limited | Barnet | 2014 |
| Aldgate Advisory Ltd | London | 2026 |
| Aldgate Clinical Research Limited | Wimborne | 2019 |
| Aldgate Enterprises Ltd | London | 2018 |
| Aldgate Finance Limited | London | 1996 |
| Aldgate Services Limited | London | 2020 |
| Aldgate Veterinary Practice Ltd | Driffield | 2012 |
| Aldi Limited | Warwickshire | 1989 |
| Aldia Technologies Limited | London | 2013 |
| Aldin Accountancy Services Ltd | Slough | 2019 |
| Aldingbourne Accountancy Services Limited | Chichester | 1984 |
| Aldis Law Limited | Guildford | 2014 |
| Aldis Supply & Support Services Ltd | London | 2018 |
| Aldiss Geological Consulting Ltd | Marlow | 2020 |
| Aldmark Electrical Limited | Newcastle Upon Tyne | 1991 |
| Aldmont Consulting Limited | Glasgow | 2014 |
| Aldo Pennini Limited | London | 2019 |
| Aldo Services Limited | Enfield | 1998 |
| Aldo Zanetti Limited | Sale | 2019 |
| Aldo's UN Limited | Newtownabbey | 2025 |
| Aldomi Limited | Accrington | 2017 |
| Aldoory Ltd | London | 2025 |
| Aldosia Ltd | London | 2026 |
| Aldous Advisory Ltd | Bury St. Edmunds | 2025 |
| Aldous Clinical Research Consultancy Limited | Lancing | 2022 |
| Aldous Coaching Ltd | Bury St. Edmunds | 2020 |
| Aldous Emea Ltd | Harrogate | 2018 |
| Aldous Group Limited | Epping | 2018 |
| Aldous Hodgkinson Consulting Limited | Ashford | 2024 |
| Aldr Consulting Limited | Leicester | 2025 |
| Aldred Consultancy Limited | Bury | 2014 |
| Aldred Limited | Lancashire | 2004 |
| Aldren Property Services Ltd | London | 2015 |
| Aldrex Limited | Manchester | 1953 |
| Aldrich Capital Ltd | Cardiff | 2025 |
| Aldrich Fundraising Limited | Lewes | 2014 |
| Aldrich Global Ltd | Thamesmead | 2013 |
| Aldrich Partners Limited | London | 2026 |
| Aldrich Payton Consultants Limited | London | 2021 |
| Aldrich Payton Holding Limited | London | 2021 |
| Aldridge & Jones Limited | Petersfield | 2012 |
| Aldridge Analytical Engineering Services Limited | Hertford | 2023 |
| Aldridge Architectural Design Ltd | Walsall | 2015 |
| Aldridge Consulting Services Limited | Manchester | 2019 |
| Aldridge E.D Services Ltd | Birmingham | 2025 |
| Aldridge Financial Accountants Limited | Walsall | 2007 |
| Aldridge Heat Treatment Limited | Rickmansworth, | 1952 |
| Aldridge Management Accountancy Services Ltd | Walsall | 2012 |
| Aldridge Management Solutions Limited | Coventry | 2014 |
| Aldridge Payroll Solutions Ltd | Walsall | 2017 |
| Aldridge Ritchie Capital Ltd | Hove | 2025 |
| Aldridge Taxation and Accountancy Services Limited | Northampton | 2003 |
| Aldridge Vale Associates Ltd | Walsall | 2002 |