| Alden Business Consulting Ltd | Edinburgh | 2016 |
| Alden Engineering Ltd | Stoke-On-Trent | 2025 |
| Alden Enterprises Limited | Derbyshire | 2023 |
| Alden Fire Consultants Limited | Benfleet | 2024 |
| Alden Machines Ltd | Stoke-On-Trent | 2025 |
| Alden Motor Holdings Limited | Chipping Sodbury | 2011 |
| Alden Professional Services Limited | London | 2021 |
| Alden Rose Ltd | Billericay | 2021 |
| Alden Smith Limited | West Yorkshire | 2005 |
| Alden Taxation Services Limited | Newmarket | 2000 |
| Aldena One Ltd | Wantage | 2013 |
| Aldena Therapeutics (UK) Ltd | London | 2021 |
| Aldena Two Ltd | Wantage | 2013 |
| Aldenham Consulting Ltd | London | 2017 |
| Aldenoak Consultancy Services Limited | Eastleigh | 2017 |
| Aldenvere Ltd | Bath | 2026 |
| Aldenys Ltd | London | 2026 |
| Aldeo Limited | Wirral | 2009 |
| Alder & Carter Limited | Salford | 2018 |
| Alder & Partners Ltd | Middlesbrough | 2025 |
| Alder Advice Limited | Beckenham | 2011 |
| Alder Advisory Limited | Chichester | 2022 |
| Alder Building Consultants Ltd | Verwood | 2026 |
| Alder Consultancy Ltd | Wantage | 2012 |
| Alder Consulting (UK) Ltd | Barking | 2002 |
| Alder Demain & Akers Limited | Abingdon | 2013 |
| Alder Ecology UK Ltd | Trowbridge | 2009 |
| Alder Group Limited | Weybridge | 1981 |
| Alder HEY Esco Ltd | Stoke-On-Trent | 2020 |
| Alder HEY Holdco 1 Limited | Swanley | 2013 |
| Alder HEY Holdco 2 Limited | Swanley | 2013 |
| Alder HEY Holdco 3 Limited | Swanley | 2013 |
| Alder HEY Ventures Limited | Liverpool | 2017 |
| Alder Hill Consultancy Ltd | Kirriemuir | 2018 |
| Alder Limited | London | 2004 |
| Alder Media Limited | Haslemere | 2010 |
| Alder Payroll Services Limited | Poole | 2023 |
| Alder Research Limited | Preston | 2013 |
| Alder Strategy Limited | London | 2025 |
| Alder Structural Engineering Ltd | Wareham | 2024 |
| Alder Translations Limited | Aylesbury | 2021 |
| Alder Tree Consulting Ltd | Reading | 2011 |
| Alder Way 2 Ltd | London | 2025 |
| Alder Way 3 Ltd | London | 2025 |
| Alder Way 4 Ltd | London | 2025 |
| Alder Wills & Probate Limited | Yateley | 2007 |
| Alderaan-Labs Limited | Hitchin | 2026 |
| Alderbourne Advisors Ltd | London | 2025 |
| Alderbright Ltd | Glasgow | 2023 |
| Alderbrook Accounting Ltd | London | 2026 |
| Alderbrook Consulting Limited | Guildford | 1997 |
| Alderbrook Partners Ltd | Bury St. Edmunds | 2026 |
| Alderburn Limited | Tain | 2011 |
| Alderdale Europe Ltd | Wirral | 2019 |
| Alderfen Ltd | Neatishead, Norwich | 2018 |
| Alderfield Consulting Ltd. | Ware | 2011 |
| Alderfield Limited | Exeter | 2014 |
| Alderflow Limited | Esher | 2016 |
| Alderforth Limited | Liverpool | 2025 |
| Aldergrove Investments Ltd | Manchester | 1996 |
| Alderham Barford Group Ltd | Preston | 2021 |
| Alderic Limited | London | 2017 |
| Alderill Ltd | Cockermouth | 2017 |
| Alderley Advisory Limited | Preston | 2024 |
| Alderley Analytical Ltd | Macclesfield | 2013 |
| Alderley Architecture Limited | Stockport | 2017 |
| Alderley Consultants (North West) Limited | Lathom | 2004 |
| Alderley Cross Limited | Newton-Le-Willows | 2015 |
| Alderley Edge Architects Limited | Chorley | 2018 |
| Alderley Edge Cricket Club Limited | Wilmslow | 1960 |
| Alderley Edge Strategic Developments Limited | Wilmslow | 2026 |
| Alderley Finance Ltd | London | 2017 |
| Alderley Financial Planning Ltd | Knutsford | 2022 |
| Alderley HR Solutions Ltd | Alderley Edge | 2013 |
| Alderley Imaging Limited | Manchester | 2015 |
| Alderley Industries Limited | Macclesfield | 2005 |
| Alderley Investments Limited | Macclesfield | 2005 |
| Alderley Payroll Services Limited | Cheshire | 2006 |
| Alderley Pharmaceuticals Limited | Alderley Edge | 2002 |
| Alderley PLC | Manchester | 1989 |
| Alderley Projects Limited | Shepperton | 2014 |
| Alderley Property Group Ltd | Withington | 2023 |
| Alderman Accountants Limited | Oakham | 2017 |
| Alderman Associates Limited | Hailsham | 2023 |
| Alderman Consulting Limited | Axminster | 2008 |
| Alderman Grange Ltd | Hull | 2011 |
| Alderman Services Ltd | Glasgow | 2019 |
| Aldermanbury Partners Ltd | London | 2012 |
| Aldermark Limited | Bridgend | 2018 |
| Alderminster Kennels Ltd | Stratford-Upon-Avon | 2015 |
| Aldern Consulting Limited | London | 2022 |
| Alderney Ltd | London | 2019 |
| Alderney Race Limited | Oakham | 2012 |
| Alderney ST Ltd | Cheltenham | 2025 |
| Aldero UK Limited | London | 2020 |
| Alderock Holdco Limited | Kidderminster | 2023 |
| Alders Accountants Limited | Seaton | 2018 |
| Alders HSE Consult Ltd | Croydon | 2023 |
| Alders Property and Development Services Limited | Dingestow | 2023 |
| Aldersbrook Consulting Limited | Wimbledon | 2020 |