| Azarteyf Ltd | London | 2024 |
| Azatek Instruments Ltd | Gillingham | 2018 |
| Azatom Group Limited | Billingham | 2004 |
| AZB1 Limited | Shotton | 2018 |
| Azee Manufacturing Ltd | Nottingham | 2025 |
| Azeemoazee Holdings Ltd | Bushey | 2023 |
| Azeen Fashion UK Ltd | London | 2025 |
| Azencare Ltd | London | 2026 |
| Azenta UK Ltd | Irlam | 2000 |
| Azfabricshop Ltd | Sutton | 2017 |
| Azfades Ltd | London | 2024 |
| Azgard Electrical Services Ltd | Wembley | 2019 |
| Azguard Ltd | Coleraine | 2022 |
| Azhar Trading Limited | Morden | 2016 |
| AZI Electrical Ltd | Wolverhampton | 2026 |
| Aziairtech Ltd | Richmond | 2026 |
| Azikal Metal Limited | Grimsby | 2025 |
| Azil Racking and Shelving Limited | Milton Keynes | 2016 |
| Azima Exclusive (London) Limited | London | 2025 |
| Azimex Fabrications Limited | Northampton | 1981 |
| Azimi General Trading Ltd | Manchester | 2025 |
| Azimuth Audio Ltd | London | 2020 |
| Azimuth Print Limited | Bristol | 1989 |
| Azimuth Technology (UK) Limited | Wickford | 2012 |
| Azirome Ltd | Bournemouth | 2016 |
| Azitech Electrical & Maintenance Ltd | Edinburgh | 2025 |
| Azitis Fabrication Ltd | Nairn | 2023 |
| Aziza Illustrates Ltd | Birmingham | 2021 |
| Azizrahmanenterprise Limited | Oldham | 2023 |
| AZL Marine Ltd | Cambridge | 2026 |
| Azma Productions Ltd | London | 2022 |
| AZN Advertising Ltd | London | 2021 |
| AZO Equipment Ltd | Sturminster Newton | 2010 |
| AZO Print Limited | Rochester | 2010 |
| Azon UK Limited | St Mellons Cardiff | 1985 |
| Azone Enterprises Ltd | Kington | 2025 |
| Azonic Solutions Limited | Biggleswade | 2007 |
| Azonto Globus Ltd | London | 2025 |
| Azoth Nephili Collective Limited | Leeds | 2025 |
| Azoz London Limited | London | 2018 |
| Azpack Limited | Loughborough | 1992 |
| Azpet Ltd | Bradford | 2020 |
| Azpm Limited | Swindon | 2014 |
| AZR Motor Sport Ltd | Solihull | 2020 |
| Azranatures Ltd | London | 2025 |
| Azserv.Co.Uk Limited | Chesterfield | 2009 |
| Aztec Aerosols Limited | Crewe | 1983 |
| Aztec Composites Limited | Northampton | 1997 |
| Aztec Electrical & Data Limited | Weston-Super-Mare | 2001 |
| Aztec Engineering (Charing) Limited | Kent | 2006 |
| Aztec Glasgow Ltd | Glasgow | 2020 |
| Aztec Glass and Balustrade Ltd | Bridgend | 2019 |
| Aztec Glass Ltd | Southend On Sea | 2016 |
| Aztec Interiors (Leicester) Limited | Leicester | 2004 |
| Aztec Joinery Limited | Cowbridge | 2018 |
| Aztec Label Limited | Kidderminster | 2007 |
| Aztec London Ltd | Ashford | 2020 |
| Aztec Mouldings Limited | Walsall | 2018 |
| Aztec Office Contracts Ltd | Darwen | 2002 |
| Aztec Oils Limited | Chesterfield | 1998 |
| Aztec Precision Engineering Ltd | Bedfordshire | 2002 |
| Aztec Presentations Limited | Leeds | 1993 |
| Aztec Print North East Limited | Washington | 1997 |
| Aztec Printwear Ltd | Sunderland | 2024 |
| Aztec Sails and Covers Ltd | Caerphilly | 2021 |
| Aztec Security Systems Limited | Gravesend | 2005 |
| Aztec Services (UK) Limited | High Wycombe | 2011 |
| Aztec Shutters Ltd | Andover | 2024 |
| Aztec Skincare Ltd | Hexham | 2022 |
| Aztec Spirits Ltd | Port Talbot | 2018 |
| Aztec Tooling & Moulding Co. Limited | Walsall | 1982 |
| Aztec Umbrella Systems Limited | Basingstoke | 2016 |
| Aztech Engineering (UK) Limited | Barrowford | 2000 |
| Aztech Engineering Limited | Claybrooke Parva | 1997 |
| Aztech Precision Limited | Barnham | 2003 |
| Aztecon Limited | Middlesbrough | 1998 |
| Azteq Environmental Limited | Amersham | 2005 |
| Aztex Designs Limited | Bolton | 2003 |
| Azttec Limited | Rhyl | 2016 |
| AZU Systems Ltd | London | 2025 |
| Azucar Treats Ltd | Canterbury | 2021 |
| Azul Engineering UK Ltd | Hull | 2026 |
| Azul Optics Limited | Bristol | 2016 |
| Azuni Limited | Oldham | 1998 |
| Azura Chocolat Ltd | London | 2020 |
| Azura Lite Ltd | Nottingham | 2023 |
| Azura Soft Furnishings (UK) Limited | Oldham | 2006 |
| Azure Communications UK Limited | Kingston Upon Thames | 2020 |
| Azure Development Solutions Ltd | Ringwood | 2007 |
| Azure Hawker Limited | London | 2021 |
| Azure International Limited | Sheerness | 1993 |
| Azure Jewellery Workshop Limited | Leeds | 2024 |
| Azure Liquid Solutions Limited | London | 2013 |
| Azuri SSPV1 Ltd | Cambridge | 2017 |
| Azuri Technologies Ltd | Cambridge | 2012 |
| Azurite Solutions Limited | Frodsham | 2014 |
| Azvex Brewing Company Ltd | Liverpool | 2020 |
| Azwoodworks Ltd | Reading | 2025 |
| Azymis Ltd | Ilford | 2025 |
| Azymus Wellness Ltd | Bedford | 2026 |