| Allegra Acquisitions Limited | London | 2014 |
| Allegra Invest Limited | London | 2024 |
| Allegra Ltd | Epsom | 2022 |
| Allegra Sloane Holdings Limited | Bootle | 2025 |
| Allegro Asset Holding Limited | Stockport | 2022 |
| Allegro Bidco Limited | London | 2026 |
| Allegro Finance Limited | Wokingham | 2024 |
| Allegro Group Holdings Limited | Bristol | 2019 |
| Allegro Industrial Planning Ltd | Mildenhall | 2024 |
| Allegro Midco Limited | London | 2026 |
| Allegro Mortgages Limited | Milton Keynes | 2018 |
| Allegro Topco Limited | London | 2026 |
| Allemond Ltd | Bolton | 2022 |
| Allen & Allen Holdings Limited | Godalming | 2019 |
| Allen & Pemble Limited | North Walsham | 2008 |
| Allen and Rees Holdings Ltd | Lincoln | 2026 |
| Allen Assets Ltd | Chesham | 2020 |
| Allen Brothers (Holdings) Limited | Burnham-On-Crouch | 2025 |
| Allen Clark Investments Limited | Rochford | 2023 |
| Allen Day (Holdings) Ltd | London | 2020 |
| Allen Fabrications Finance Limited | Evesham | 2016 |
| Allen Fabrications Holdings Limited | Evesham | 2016 |
| Allen Finance Limited | Swansea | 2015 |
| Allen Financial Services Ltd | Spalding | 2015 |
| Allen Group Holdings Ltd | Ramsgate | 2025 |
| Allen Group Hotels Limited | Scarborough | 2023 |
| Allen Langrick Financial Ltd | Polegate | 2015 |
| Allen Management Group Ltd | Newcastle Upon Tyne | 2025 |
| Allen Property Consultancy Ltd | Dartford | 2021 |
| Allen Property Group Ltd | Hawarden | 2025 |
| Allen Quay Holdings Ltd | Lamphey | 2019 |
| Allen Render Holdings Ltd | Leicester | 2019 |
| Allen Rose Accountants Limited | Wolverhampton | 2023 |
| Allen Salter Wealth Management Ltd | Swindon | 2000 |
| Allen Tomas & Co Financial Management Ltd. | Sunderland | 2014 |
| Allen Trading Ltd | Feltham | 2026 |
| Allen Trump Holdings Limited | Exeter | 2009 |
| Allen's Pubs Limited | Congleton | 2022 |
| Allen, West and Foster Financial Services Limited | Sheffield | 2018 |
| Allenby & Todd Limited | Cleethorpes | 2015 |
| Allenby Capital Limited | London | 2008 |
| Allenby Douglas Properties Ltd | Shropshire | 2020 |
| Allenby Holdings (North East) Ltd | United Kingdom | 2026 |
| Allendale Care Holdings Limited | Newcastle | 2022 |
| Allenek Ltd | London | 2012 |
| Allenheads Limited | Horsham | 2015 |
| Allens Accountants (Holdings) Limited | Stockport | 2013 |
| Allens Caravans Investments Ltd | Henley-In-Arden | 2026 |
| Allens TPS Group Limited | West Byfleet | 2019 |
| Allens Transport Holdings Limited | Stourbridge | 2020 |
| Allensmore Group Holdings Limited | Hereford | 2024 |
| Allensons Mortgage Advisors Limited | Wokingham | 2001 |
| Allenwest Pioneer Limited | London | 2021 |
| Allen’S Caravans (Estates) Holdings Limited | Henley-In-Arden | 2024 |
| Allereso Limited | Derby | 2023 |
| Allergy Shop Ltd | Worcester | 2019 |
| Allertex Holdings Limited | Nelson | 2011 |
| Allerton Bradley Holdings Limited | Sleaford | 2019 |
| Allerton Construction Limited | Lincolnshire | 1974 |
| Allerton Holdings Limited | Sleaford | 2019 |
| Allerton Invest Holdings Limited | Sleaford | 2019 |
| Allerton Joinery Limited | Formby | 1997 |
| Allerton Yorkshire Holdings Limited | Leeds | 2022 |
| Allertons Holdings Limited | Leeds | 2026 |
| Allesley Holdings Limited | Kenilworth | 2024 |
| Alletun Limited | Welwyn Garden City | 2025 |
| Allevale Limited | London | 2024 |
| Allevion Capital Limited | London | 2026 |
| Alleyn Court Educational Trust | Southend On Sea | 1992 |
| Alleynian Holdco Limited | London | 2024 |
| Alleyoop Group Holdings Ltd | Glasgow | 2026 |
| Allfor Group Limited | Halesowen | 2026 |
| Allfunds Group PLC | London | 2017 |
| Allfunds Nominee Limited | London | 2008 |
| Allg Consultancy Limited | Aberdare | 2016 |
| Allgate Turn Key Solutions Limited | Cardiff | 2023 |
| Allgm Holding Ltd | London | 2022 |
| Allgood Cambs Holdings Limited | Peterborough | 2010 |
| Allgroup Holdings Limited | Cannock | 2023 |
| Allgroup Packaging Holdings Limited | Cannock | 2024 |
| Allhaven Limited | Knutsford | 1988 |
| Alli 55 Holdings Limited | London | 2021 |
| Allia Bond Services Limited | London | 2014 |
| Allia C&C Ltd | London | 2016 |
| Alliance & Capital Limited | London | 2024 |
| Alliance & Leicester Personal Finance Limited | London | 1990 |
| Alliance Best Practice Limited | Warwick | 2013 |
| Alliance Bidco Ltd | London | 2022 |
| Alliance Bridging Company Limited | Liskeard | 2006 |
| Alliance Capital International Ltd | London | 2024 |
| Alliance Capital Sbuk Ltd | London | 2025 |
| Alliance CFM Group Limited | Reading | 2024 |
| Alliance Chemicals Holding Company Limited | Manchester | 2013 |
| Alliance Commercial Finance Limited | Birmingham | 2008 |
| Alliance Commercial Limited | Crewe | 2017 |
| Alliance Commercial Mortgages Ltd | Wellingborough | 2019 |
| Alliance Communications Holdings Limited | Dummer | 2021 |
| Alliance Connectivity Group Ltd | Warrington | 2024 |
| Alliance Corporate Holdings Ltd | West Bromwich | 2016 |
| Alliance Empire Corporation Ltd | Brackley | 2021 |