| Axivn Magnexr Solutions Ltd | Manchester | 2026 |
| Axivon Novexa Systems Ltd | Manchester | 2026 |
| AXL Analytics Ltd | London | 2024 |
| Axle 1971 Limited | Nuneaton | 2014 |
| Axllrod Ltd | Swansea | 2017 |
| Axminster Marble Limited | London | 2002 |
| Axmint Ltd | Biggleswade | 2015 |
| Axner Holding Limited | London | 2020 |
| Axner Investment Limited | London | 2020 |
| AXO 1 Limited | London | 2023 |
| Axonar Ltd | Birmingham | 2015 |
| Axonity Fluxera Systems Ltd | Manchester | 2026 |
| Axorent Voryxa Trading Ltd | Manchester | 2026 |
| Axsuma Cosec Limited | London | 2026 |
| Axsym Limited | Yeovil | 2010 |
| AXT Law Ltd | Manchester | 2025 |
| AXV Audio Visual Limited | Aberdeen | 2025 |
| Axwell Decorating Services Ltd | Newcastle Upon Tyne | 2015 |
| Axxis Limited | London | 2005 |
| AY Ltd | Saffron Walden | 2008 |
| AYA Built Environment Limited | London | 2010 |
| AYA International Trading Co., Limited | Cambridge | 2021 |
| AYA Retail Ltd | Enfield | 2022 |
| Ayabelle Limited | Great Dunmow | 2012 |
| Ayam Zaman Ltd | Ruislip | 2015 |
| Ayanna Logistics Ltd | Birmingham | 2024 |
| Ayano Ltd. | Bury St Edmunds | 2012 |
| Ayash FNB Ltd | Middlesbrough | 2021 |
| Ayaz Yachting Limited | Blackpool | 2025 |
| AYC RESPONSE24 Limited | Radstock | 2022 |
| Ayce Planning Limited | Cheltenham | 2016 |
| Ayckbourn Chapters Management Company Limited | Scarborough | 1990 |
| Aycliffe and Peterlee Development Company Limited | London | 1987 |
| Ayda Yachting Ltd | London | 2025 |
| Ayefes Ltd | London | 2025 |
| Ayelu Integrated Social and Economic Development Association (Aised) | Warfield | 2001 |
| AYK Yachting Ltd | London | 2025 |
| Aykai Ltd | London | 2014 |
| Aykz N Painz Ltd | London | 2023 |
| AYL Limited | London | 2024 |
| Ayla Lounge Ltd | London | 2018 |
| Ayle Property Company Limited | Alston | 1997 |
| Aylesbury Accountancy Limited | Aylesbury | 2019 |
| Aylesbury Auto Salvage Limited | Beaconsfield | 2004 |
| Aylesbury Gates Ltd | Aylesbury | 2018 |
| Aylesbury Glazing Ltd | Bristol | 2021 |
| Aylesbury House Management Company Limited | Wembley | 2014 |
| Aylesbury Secondary Metals Limited | Beaconsfield | 2004 |
| Aylesbury Window Repairs Ltd | Bristol | 2020 |
| Aylesford Street Property Management Company Limited | Altrincham | 1993 |
| Aylex Properties Ltd | London | 2018 |
| Aylsham MOT Centre Ltd | Norwich | 2024 |
| Aylwin House Limited | Shoreham-By-Sea | 2013 |
| AYM Management Ltd | Edinburgh | 2012 |
| AYM Studio Ltd | Eastbourne | 2018 |
| Aymeva Marine Ltd | London | 2026 |
| Aympek Ltd | Edinburgh | 2012 |
| AYO 18 Limited | Swadlincote | 2018 |
| Ayoub Norway Limited | London | 2024 |
| AYP Financial Planning Limited | Chorley | 2005 |
| Ayra Investments Limited | London | 2024 |
| Ayrestone Ltd | London | 2025 |
| Ayrshire Artisan Chefs Limited | Lancaster | 2017 |
| Ayrshire Baby Centre Limited | Kilmarnock | 2024 |
| Ayrshire Dental Implant Centre Limited | Ayr | 2011 |
| Ayrshire Power Holdings Limited | Manchester | 2008 |
| Ayrshire Taxis Limited | Ayr | 2015 |
| Ayrshire Window Company Ltd | Glasgow | 2023 |
| Ayrton Road (Churchdown) Management Company Limited | Gloucester | 2025 |
| AYS Marketing Ltd | Birmingham | 2023 |
| Aysem Limited | Cambridge | 2025 |
| Aysi Yachting Ltd | London | 2026 |
| Aystero Ltd | London | 2024 |
| Aysu International Trading Co., Limited | Beckenham | 2023 |
| AYT Yachting Ltd | London | 2025 |
| Ayten&Arwa Ltd | Stafford | 2024 |
| Ayvion Ltd | London | 2020 |
| Ayzam Ltd | Manchester | 2025 |
| AZ Active Sports Limited | Cardiff | 2012 |
| AZ Bygg & Montering Invest Limited | London | 2023 |
| AZ Chohaan Enterprise Ltd | Romford | 2016 |
| AZ Fashion Sense Beauty Limited | London | 2021 |
| AZ Fiber Limited | Warrington | 2012 |
| AZ Flange Management Limited | Bedlington | 2015 |
| AZ Ltd | Newmarket | 2020 |
| AZ Planet Ltd | Rochdale | 2022 |
| AZ Scarborough Limited | Chorley | 2010 |
| AZ8 Limited | Manchester | 2022 |
| AZA World Limited | Broxbourne | 2015 |
| Azad Property Management Ltd | Enfield | 2017 |
| Azad Sharify Limited | London | 2021 |
| Azad Yachting Ltd | London | 2026 |
| Azai Ltd | Manchester | 2025 |
| Azal Foods Limited | Croydon | 2021 |
| Azal Medical Holdings Limited | Birmingham | 2016 |
| Azaleos Holdings Limited | Burton-On-Trent | 2021 |
| Azam Food Co. Ltd | London | 2019 |
| Azam Management Consultancy Ltd | London | 2019 |
| Azas Ventures Ltd | Romford | 2023 |
| Azason Trading Co., Ltd | London | 2024 |