| Allerton Barbers Ltd | Northallerton | 2023 |
| Allerton Invest Limited | Sleaford | 2019 |
| Allerton Memorial Holdings Limited | Reading | 2024 |
| Allerton Memorial Services Limited | Reading | 2007 |
| Alles Ltd | Armagh | 2019 |
| Allesley Barber Ltd | Coventry | 2022 |
| Allesley Park Evangelical Church | Coventry | 2011 |
| Allesta Guardians Ltd | Swindon | 2025 |
| Allestree Domestic Services Limited | Derby | 2012 |
| Allestree Health & Homecare Services Limited | Derby | 2012 |
| Alleviate Therapy Ltd | Birmingham | 2025 |
| Alley Barber Grooming Ltd | Luton | 2021 |
| Alley Barbers Limited | Shrewsbury | 2003 |
| Alley Cats Beauty Studio (Alton) Ltd | Petersfield | 2026 |
| Alley Cats Beauty Studio Limited | Petersfield | 2005 |
| Alley Way Barbers Ltd | Sutton | 2018 |
| Allezbeheer Ltd | Milton Keynes | 2024 |
| Allfaith Ltd | Birmingham | 2025 |
| Allfare Ltd | Swindon | 2019 |
| Allfind Limited | Cardiff | 2021 |
| Allfixes (Resi) Ltd | London | 2025 |
| Allgas (Derby) Limited | Derby | 2006 |
| Allglow Ltd | Newton Aycliffe | 2021 |
| Allgone Enterprises Ltd | London | 2025 |
| Allgood Cleaning Services Limited | Bognor Regis | 2003 |
| Allgood Consultancy Limited | Blyth | 2015 |
| Allgreasedout Ltd | Kidlington | 2016 |
| Allhallows Caravan Park Ltd | Rochester | 2019 |
| Allhuman Ltd | London | 2023 |
| Alliance Against Counterfeit Spirits Limited | | 2005 |
| Alliance Business Group Ltd | London | 2023 |
| Alliance Combined Services Limited | Leicester | 2023 |
| Alliance Connectivity Ltd | Warrington | 2020 |
| Alliance DE Congolais Progressistes ACP UK | London | 2026 |
| Alliance Film Distributors Limited | London | 1959 |
| Alliance Fire Protection (North) Ltd | Elland | 2010 |
| Alliance Fire Safety Limited | Rochester | 2010 |
| Alliance for Active Community (A4AC) C.I.C. | Paisley | 2024 |
| Alliance for Democracy and Freedom Party Ltd | Oldham | 2019 |
| Alliance for Development Foundation (ADF) Ltd | London | 2023 |
| Alliance for Sustainable Cities and Communities GmbH | London | 2020 |
| Alliance for Sustainable Development Goals Limited | London | 2020 |
| Alliance GSR Ltd | Hounslow | 2023 |
| Alliance Inspection Group Ltd | Liverpool | 2017 |
| Alliance Lifting Services Limited | Pembroke Dock | 1991 |
| Alliance Medico Legal Services Limited | Liverpool | 2013 |
| Alliance NOW UK Limited | London | 2023 |
| Alliance of British Watch and Clock Makers Limited | Coventry | 2020 |
| Alliance of Claims Companies Limited | Bristol | 2016 |
| Alliance of Global Fastener Technology Specialists Limited | Stockport | 2023 |
| Alliance of Hope & Care C.I.C. | Bolton | 2024 |
| Alliance of Independent Agencies Ltd | London | 2018 |
| Alliance of Independent Events Agencies | Marlow | 2017 |
| Alliance of Independent Promoters (UK) CIC | Kings Langley | 2023 |
| Alliance of Media Independents Limited | London | 2025 |
| Alliance of Private Sector Practitioners Limited | Dudley | 2002 |
| Alliance of Pro-Life Students Limited | Poole | 2012 |
| Alliance of Registered Homeopaths Limited | Nutley | 2001 |
| Alliance of Technology Transfer Professionals | Greenock | 2010 |
| Alliance of Two Hearts Ltd | South Croydon | 2012 |
| Alliance Physiotherapy Ltd | Chelmsford | 2009 |
| Alliance TKD Ltd | Ilminster | 2024 |
| Allianz Care Ltd | London | 2022 |
| Alliapp Limited | Epsom | 2012 |
| Allice Nails and Beauty Ltd | Birmingham | 2023 |
| Allie BEE Ltd | York | 2023 |
| Allie Cresswell Limited | Warrington | 2018 |
| Allied Accountings Ltd | Harrow | 2017 |
| Allied Boards Ltd | Barnet | 2020 |
| Allied Build Sourcing & Supplies Ltd | Chatham | 2019 |
| Allied Capital Limited | Shipley | 2016 |
| Allied Catalyst Ltd | London | 2023 |
| Allied Claims Management Ltd | Rhyl | 2015 |
| Allied Couriers Ltd | Preston | 2009 |
| Allied Ecommerce Limited | Gillingham | 2026 |
| Allied Enterprise Service Limited | South Croydon | 2019 |
| Allied Global Engineering Ltd | Wolverhampton | 2019 |
| Allied Golf Solutions Ltd | Glasgow | 2026 |
| Allied Group Limited | Armagh | 2017 |
| Allied Hub Ltd | London | 2026 |
| Allied Mastclimbers & Hoists Ltd | Preston | 2016 |
| Allied Oils Limited | Belfast | 1985 |
| Allied Property (UK) Ltd | Wembley | 2013 |
| Allied Roofing (Holdings) Ltd | Warrington | 2012 |
| Allied Spaces Limited | Stafford | 2021 |
| Allied Vehicle Deliveries Limited | Harrow | 2001 |
| Allied Vehicles Charitable Trust | Glasgow | 2015 |
| Alliedbrigade Security Group Limited | London | 2016 |
| Alliedhealthcareservices UK Ltd | London | 2014 |
| Allilon Limited | Broxbourne | 2011 |
| Allina Limited | Hitchin | 2016 |
| Allingtan Ltd | Maidstone | 2024 |
| Allington Collaborative Problem Solving Limited | Gerrards Cross | 2020 |
| Allington Manor Events Limited | Nottingham | 2013 |
| Allington Trust | Lewes | 2016 |
| Allinoneactive Ltd | Nottingham | 2025 |
| Alliott Global Alliance | London | 1997 |
| Allis Ltd | Glasgow | 2016 |
| Allison Contracting Services Limited | Hammersmith | 2012 |
| Allium Armourer Services Ltd | Peterborough | 2025 |