| Allsopp Advisory Group Limited | Walsall | 2025 |
| Allsopp Detailing Limited | Melton Mowbray | 2016 |
| Allsopp Studio Limited | Reading | 2022 |
| Allsopp Technologies Ltd | Fordingbridge | 2012 |
| Allsorts Advisory Ltd | London | 2023 |
| Allspan Limited | Chapel En Le Frith | 1962 |
| Allspares Auto (Holdings) Limited | Bridgend | 2015 |
| Allspeed DS Limited | East Grinstead | 2007 |
| Allspeed Industrial Equipment (Home Counties) Limited | Lee On The Solent | 1994 |
| Allsports Event Management Ltd | York | 2009 |
| Allsports.Co.Uk Limited | Bury | 1971 |
| Allsquare (Edinburgh) Limited | Lamlash | 2004 |
| Allsquare (UK) Ltd | Isle Of Arran | 1995 |
| Allstal Engineering Ltd | Wakefield | 2022 |
| Allstar Development Contracts Limited | Halesowen | 1978 |
| Allstar Engineering Ltd | Rotherham | 2020 |
| Allstar International Limited | Whittlebury | 1999 |
| Allstar Property Services Ltd | Bromley | 2025 |
| Allstar Technical Solutions Limited | London | 2022 |
| ALLSTAR365MUSIC Ltd | London | 2025 |
| Allstars Film & TV Ltd | Surbiton | 2022 |
| Allstars INT Ltd | London | 2025 |
| Allstimate Ltd | Greenford | 2023 |
| Allstor Limited | Truro | 2006 |
| Allstore Ltd | Truro | 2003 |
| Allstore Storage Limited | Truro | 2004 |
| Allstores Ltd | Truro | 2008 |
| Allstrat Limited | Alloa | 2002 |
| Allstruct Limited | London | 2012 |
| Allswage UK Properties Limited | Droitwich | 2010 |
| Allt Environmental Ltd | Bury St. Edmunds | 2020 |
| Allt-Energy Limited | Callander | 2010 |
| Alltair Structures Limited | Deeside | 2026 |
| Alltake Ltd | London | 2024 |
| Alltech E-CO2 Limited | Stamford | 2009 |
| Alltech International Limited | Dundee | 2016 |
| Alltech Trans Limited | Kent | 2002 |
| Alltech's Beverage Division UK Limited | Stamford | 2008 |
| Allternet Limited | Wokingham | 2015 |
| Allthatsintegral Limited | Thornton-Cleveleys | 2009 |
| Allthebest Accounting Ltd | London | 2023 |
| Allthebestthings Limited | London | 2016 |
| Alltherightmoves Limited | Liverpool | 2019 |
| Allthings POP Music Promo Ltd | Aylesford | 2024 |
| Allthings POP Music UK Ltd | Aylesford | 2026 |
| Allthingscommon Limited | Beaconsfield | 2025 |
| Allthingscrown Ltd | Bathgate | 2025 |
| Allthingsunlimited Ltd | Leeds | 2024 |
| Allthorpe Consulting Ltd | Leamington Spa | 2020 |
| Alltogether Design Ltd | Leeds | 2024 |
| Alltongue Ltd | London | 2023 |
| Allton’S Strategy and Consultancy Ltd | Nottingham | 2025 |
| Alltorc Innovations Limited | Northampton | 2026 |
| Alltorc Limited | Coleshill | 2002 |
| Alltranz Limited | Northants | 2006 |
| Alltree Consultancy Limited | West Kingsdown | 2017 |
| Alltru Limited | Solihull | 2024 |
| Alltrust Eput NO 1 Trustees Limited | Salisbury | 2025 |
| Alltrust Eput NO 2 Trustees Limited | Salisbury | 2025 |
| Alltrust Investment Trustees Limited | Salisbury | 2025 |
| Alltrust Limited | Salisbury | 2005 |
| Alltrust Oasis Limited | Salisbury | 2008 |
| Alltrust Sipp Limited | Salisbury | 2005 |
| Alltrust Ssas Limited | Salisbury | 2011 |
| Alltruysm Services Ltd | Blackburn | 2024 |
| Allts & Co Limited | Peterborough | 2020 |
| Alltwen Marine Ltd | Swansea | 2021 |
| Allucent (UK) Limited | Bracknell | 1995 |
| Allucent Group (UK) Limited | Bracknell | 2002 |
| Alluceo Partners Ltd | Leeds | 2020 |
| Allucrum Ltd | Southport | 2017 |
| Allum and Company Limited | London | 2011 |
| Allum Associates Limited | Brighton | 1978 |
| Allum Consult Limited | Marlow | 2024 |
| Allum Consultancy Ltd | Cambridge | 2024 |
| Allum Productions Ltd | Bromley | 2021 |
| Allume Digital Limited | Bath | 2013 |
| Allumini Limited | Keston | 2018 |
| Allumno Limited | Tunbridge Wells | 2016 |
| Allumtek Business Advisors Ltd | Haywards Heath | 2024 |
| Allure Accountancy Limited | Luton | 2025 |
| Allure Collective Ltd | Edinburgh | 2026 |
| Allure Guardian Agency Ltd | London | 2025 |
| Allure Interiors Ltd | York | 2022 |
| Allure Marketing Solutions Ltd | Glasgow | 2025 |
| Allure MTD Limited | Luton | 2024 |
| Allure Spot Ltd | London | 2026 |
| Allure Studios Ltd | Chislehurst | 2017 |
| Allure Ventures Limited | London | 2023 |
| Allurea Management Ltd | Horsham | 2024 |
| Allurebooks Ltd | Congleton | 2023 |
| Allured Limited | Worcester | 2023 |
| Allurion UK Ltd | Bristol | 2021 |
| Alluru Consulting Limited | Leicester | 2025 |
| Allus Engineering Solutions Ltd | Halifax | 2022 |
| Allusive Ltd | London | 2001 |
| Alluvial Dredges Limited | London | 1935 |
| Alluvion Consulting Ltd | New Malden | 2020 |
| Alluxi Consulting Limited | Ashford | 2015 |
| Allvg SPV Ltd | Stourbridge | 2022 |