| All-In Hypnosis Ltd | Bury St. Edmunds | 2022 |
| All-Steps Formation Ltd | Exeter | 2023 |
| All-Tec Repairs Ltd | Manchester | 2012 |
| ALL1PLACE Ltd | Doncaster | 2025 |
| Allachie Homes Limited | Glasgow | 2000 |
| Alladale Estates Limited | London | 2003 |
| Allam Marine Limited | Hull | 2025 |
| Allan Alistair Bailey Limited | Solihull | 2026 |
| Allan J Smith (Electrical Services) Limited | Cumbernauld | 2010 |
| Allan Nicholson Limited | Lancaster | 2004 |
| Allana Melody Charles Ltd | St. Albans | 2024 |
| Allard Investment Corporation Limited | Suffolk | 2001 |
| Allassio Clark Developments Limited | Milton Keynes | 2013 |
| Allbar Promotions Ltd. | West Lothian | 2010 |
| Allblade Technologies Limited | Pencoed, Bridgend | 2007 |
| Allbricks New Ltd | Middleton | 2020 |
| Allbricks Original Ltd | Manchester | 2011 |
| Allbritain Developments Limited | Worcester | 2016 |
| Allbritain Estates Limited | Worcester | 2016 |
| Allchorn Maritime Limited | Eastbourne | 2016 |
| Allchorn Pleasure Boats Limited | Eastbourne | 2015 |
| Allcon-Vest Ltd | Pencoed, Bridgend | 2013 |
| Alldance Limited | | 1993 |
| Allders (UK) PLC | Lincoln | 2012 |
| Allely Ltd | Rochdale | 2020 |
| Allen & Hanburys Limited | London | 1893 |
| Allen Assured Ltd | Bristol | 2020 |
| Allen Bennett Controls Limited | Doncaster | 2006 |
| Allen Developments (Sussex) Ltd | Hailsham | 2015 |
| Allen Estates Limited | Camberley | 1997 |
| Allen Facilities Management Limited | Berkeley | 2021 |
| Allen Homes (Central Midlands) Ltd | Wilmslow | 1992 |
| Allen House Business Centre Ltd | Sawbridgeworth | 2026 |
| Allen Integrated Security Solutions Limited | West Byfleet | 2015 |
| Allenbrook Management Company Limited | Ballyclare | 2002 |
| Allendale Court Management Co. (Lancashire) Limited | Elland | 2006 |
| Allenium Consultants Limited | Leatherhead | 2008 |
| Allens Antiques Limited | Lincoln | 1976 |
| Allens Caravans Limited | Solihull | 1947 |
| Aller Drove Ltd | Taunton | 2016 |
| Allergy Aware Scheme Limited | Dartford | 2007 |
| Allergy England Limited | Dartford | 2013 |
| Allergy Europe Limited | Dartford | 2013 |
| Allergy Northern Ireland Ltd | Antrim | 2021 |
| Allergy Scotland Limited | Glasgow | 2013 |
| Allergy UK Limited | Dartford | 2007 |
| Allergy Wales Ltd | Cardiff | 2021 |
| Allerton and Allerton Limited | Warwick | 2013 |
| Allerton Conservatories Limited | Formby | 2005 |
| Allerton Glass Limited | Formby | 1996 |
| Alleycats Films Limited | London | 2006 |
| Alleyfold Limited | London | 1986 |
| Alleyne Design Ltd | Wokingham | 2024 |
| Allez Cycling Limited | Holmfirth | 2014 |
| Allfiled.Com Limited | Southampton | 2006 |
| Allgood Invest Limited | London | 2025 |
| Allgood Investments Ltd | Norwich | 2015 |
| Allgood Norway Limited | London | 2025 |
| Allgreen Limited | Horley | 2001 |
| Alliance & Leicester Investments (NO.2) Limited | Northampton | 1988 |
| Alliance & Leicester Limited | Leicester | 1996 |
| Alliance Accountants Limited | Walsall | 2006 |
| Alliance Audit and Survey Limited | Birmingham | 2009 |
| Alliance Birmingham Limited | Southfields Basildon | 1989 |
| Alliance CARE2CARE Limited | London | 2014 |
| Alliance Cashflow Limited | Birmingham | 2008 |
| Alliance Cleaning (Holdings) Limited | Hertford | 2008 |
| Alliance Consulting Real Estate Management and Laboratories Limited | Rickmansworth | 2012 |
| Alliance Consumer Health Limited | Wiltshire | 2000 |
| Alliance Engineering Limited | Chorley | 2024 |
| Alliance Facilities Solutions Limited | Hertford | 2015 |
| Alliance Financial Recruitment Limited | Birmingham | 2009 |
| Alliance Foods Europe Limited | London | 1988 |
| Alliance for Care Ltd | Dudley | 2018 |
| Alliance for General Trading Limited | Manchester | 2026 |
| Alliance Foundation Ltd | London | 2020 |
| Alliance Generics Limited | Chippenham | 2000 |
| Alliance Group International (UK) Limited | Barnstaple | 2015 |
| Alliance Health Limited | Wiltshire | 2000 |
| Alliance Healthcare Limited | Wiltshire | 2000 |
| Alliance Heathrow Limited | Basildon Essex | 1993 |
| Alliance International Forwarders (UK) Limited | Southfields Business Park | 1993 |
| Alliance Investment Properties (London) Limited | London | 2007 |
| Alliance Investment Properties Limited | London | 2002 |
| Alliance Invoice Finance Limited | Birmingham | 2013 |
| Alliance Medical Services Ltd | Glasgow | 2018 |
| Alliance Plumbing & Heating N.E Ltd | Sunderland | 2021 |
| Alliance Power Industry Co., Ltd. | Cambridge | 2014 |
| Alliance Shipping Limited | Southfields | 1989 |
| Alliance Shipping London Ltd | Southfields | 1990 |
| Alliance Sports Capital Limited | Birmingham | 2009 |
| Alliance Surgical Indemnity Limited | Birmingham | 2011 |
| Alliance Venture Project Limited | Paisley | 2005 |
| Alliance Visual Group Ltd. | Dunstable | 2024 |
| Allianceuk Cleaning Services Limited | Hadlow | 2002 |
| Allianz Equity Investments Limited | Surrey | 1987 |
| Allied Auto Services Limited | Hungerford | 1998 |
| Allied Chemicals(Uk) Limited | Cardiff | 2020 |
| Allied Commerce Limited | York | 2009 |
| Allied Domecq Second Pension Trust Limited | Rugby | 1977 |