| Allocate Wealth Management Ltd | Perth | 2020 |
| Allocmate Ltd | Westhill | 2021 |
| Allocore Ltd | Worcester | 2018 |
| Allodi Accordions Limited | Bromley | 2004 |
| Allodium Consultants Limited | Burley In Wharfedale | 2008 |
| Alloero Consultancy Ltd | London | 2015 |
| Alloffer Limited | Marlow | 1993 |
| Alloffshore Capital Ltd | London | 2023 |
| Allofus Limited | London | 2015 |
| Allolingo Ltd | London | 2019 |
| Allomco Ltd | Malmesbury | 2021 |
| Allon Schick-Maier Limited | London | 2002 |
| Allonby Ltd | Gloucester | 2020 |
| Allond Limited | Potters Bar | 2016 |
| Allonsy Ltd | Emsworth | 2010 |
| Alloo Consultancy Limited | Birmingham | 2007 |
| Allooha Limited | London | 2013 |
| Allopen Zelhem Limited | Taunton | 2014 |
| Allopex Ltd | Rochdale | 2016 |
| Alloquy Limited | Lichfield | 2015 |
| Allora Infrastructure Limited | London | 2023 |
| Alloro Capital Partners Ltd | London | 2015 |
| Allosterica Limited | Leatherhead | 2021 |
| Allot Solutions Limited | Manchester | 2015 |
| Allotrope Tech Ltd | Tonbridge | 2026 |
| Allotropix Limited | Stonehouse | 2025 |
| Allott & Associates Limited | Darlington | 2002 |
| Allott Consultancy International Limited | London | 2024 |
| Allott Engineering Ltd | Sheffield | 2025 |
| Allouison Limited | Arundel | 2012 |
| Alloura Limited | Amersham | 2017 |
| Allout Engineering Designs Ltd | Rainham | 2018 |
| Allout Solutions Limited | Chichester | 2022 |
| Allout Studio Ltd | London | 2015 |
| Allow Consulting Limited | London | 2017 |
| Alloway Associates Ltd | Aberdeen | 2026 |
| Alloway Engineering Ltd | Ayr | 2018 |
| Alloway Promotions Limited | Erith | 2025 |
| Allowin Limited | London | 2025 |
| Alloy Analysis Limited | Sheffield | 2010 |
| Alloy Business Innovation Ltd | Epsom | 2020 |
| Alloy Engineers Limited | Nottingham | 2016 |
| Alloy Link Limited | Lichfield | 2015 |
| Alloy Ltd | Guildford | 1998 |
| Alloy Partners Limited | Epsom | 2026 |
| Alloy Revolution Ltd | Bradford | 2025 |
| Alloy Strategies Ltd. | Newcastle Upon Tyne | 2018 |
| Alloy Therapeutics UK Limited | Great Abington | 2019 |
| Alloy Weldcraft Limited | Latimer | 2011 |
| Alloy Wheel Equipment Ltd | Cannock | 2023 |
| Alloy Wheel Repairs Limited | Wallsend | 2010 |
| Alloy Wire Holding 2022 Limited | Brierley Hill, West Midlands | 2022 |
| Alloyed Limited | Yarnton | 2017 |
| Alloyfish Limited | Saltash | 2005 |
| Alloys Trading Ltd | Penzance | 2010 |
| Alloys, Wraps & Remaps Ltd | Poole | 2013 |
| Allpas Ltd | Morden | 2025 |
| Allpets Veterinary Clinic Limited | Rhyl | 2015 |
| Allphotos Limited | West Sussex | 1963 |
| Allpipe&Valve Ltd | Pontefract | 2019 |
| Allplanning Limited | London | 2020 |
| Allplay Limited | Ashwell | 2009 |
| Allpoint Independent Services Ltd | Wigan | 2024 |
| Allpoints Dental Laboratory Limited | Stroud | 2014 |
| Allport Enterprise Ltd | Bedfordshire | 2004 |
| Allpress Consulting Services Ltd | Bristol | 2019 |
| Allprop Contracts Limited | Potters Bar | 2025 |
| Allreach Group Ltd | Peterborough | 2024 |
| Allround Accountancy Services Limited | Chesterfield | 2012 |
| Allround Business Services (UK) Ltd. | Bristol | 2012 |
| Allround International Yachtservice Holding Limited | Hythe | 2019 |
| Allround IT Solutions IBC Limited | Hythe | 2018 |
| Allround Recruitment Solutions Limited | Lincolnshire | 2006 |
| Allround Wannabe Ltd | Warwick | 2023 |
| Allrounder Marketing+Consulting Ltd. | Wakefield | 2007 |
| Alls Consultancy Ltd | Denbigh | 2018 |
| Allsafe Engineering Limited | Slough | 2018 |
| Allsaint Surveying Ltd | Y Rhyl | 2026 |
| Allsaints Events Ltd | Leicester | 2017 |
| Allsaints Healthcare - Integrated Care Group Limited | Wellingborough | 2026 |
| Allsaved Limited | Billingshurst | 2000 |
| Allse Consulting Limited | Wolverhampton | 2024 |
| Allsea Energy Ltd | Blyth | 2024 |
| Allsee Media Limited | Edinburgh | 2009 |
| Allset Management & Consulting Ltd | London | 2023 |
| Allshares UK Limited | London | 2023 |
| Allshires Accountancy Limited | Shipston-On-Stour | 2021 |
| Allshot Services Limited | Sidcup | 2017 |
| Allsko Limited | London | 2014 |
| Allsmets Ltd | Leicester | 2019 |
| Allsof Global Limited | Manchester | 2023 |
| Allsop Auctions Ltd | London | 2002 |
| Allsop Civil Engineering Limited | Sale | 2004 |
| Allsop Consult Limited | Nottingham | 2013 |
| Allsop Durn Solicitors Limited | Ruislip | 2026 |
| Allsop Limited | London | 1987 |
| Allsop Project Services Limited | Inverurie | 2014 |
| Allsop Studio Limited | London | 2015 |
| Allsop Support Services Limited | Leeds | 2009 |
| Allsop Wind Engineering Consulting Ltd | London | 2025 |