| Axitex Ltd | Ballyclare | 2025 |
| Axium Process Limited | Swansea | 2002 |
| Axivity Ltd | Newcastle Upon Tyne | 2011 |
| Axle Design & Print Ltd | Glasgow | 2023 |
| Axle Engineering Ltd | Sevenoaks | 2023 |
| Axle Fashion Limited | Truro | 2013 |
| Axle Weight Technology Limited | Runcorn | 1991 |
| Axles and Turntables Ltd | Altrincham | 2016 |
| Axminster Carpets (Design) Limited | Axminster | 2025 |
| Axminster Electronics Limited | Chard | 1985 |
| Axminster Printing Company Limited | Devon | 1999 |
| Axminster Specialist Panels Ltd | Seaton | 2014 |
| Axnactive Ltd | London | 2026 |
| AXO Leisure Ltd | Keighley | 2015 |
| Axobotics Ltd. | Milton Keynes | 2016 |
| Axolot Healing Ltd | London | 2021 |
| Axomyth Ltd | Wigan | 2026 |
| Axon Cable Limited | Dunfermline | 1990 |
| Axon Chemicals Limited | Waltham Abbey | 2025 |
| Axon Composites Ltd | Stevenage | 2026 |
| Axon Corp Ltd | London | 2018 |
| Axon Data Limited | Market Rasen | 2025 |
| Axon Modern Ltd | Rotherham | 2020 |
| Axon Power & Control Ltd | Dungannon | 2000 |
| Axon Power GB Ltd | Dungannon | 2017 |
| Axon Vascular Europe Limited | Altrincham | 2025 |
| Axon VT Limited | Isleworth | 2023 |
| Axona Limited | Mildenhall | 1996 |
| Axonics Women's Health Limited | Hemel Hempstead | 1996 |
| Axonova Ltd | London | 2026 |
| Axorne Ltd | Woolwich | 2026 |
| Axpel UK Ltd | London | 2025 |
| AXR Consultancy Ltd | Glasgow | 2019 |
| AXS Designs Limited | Birmingham | 2025 |
| Axscend Limited | Runcorn | 2001 |
| Axtell Limited | Godalming | 2014 |
| Axton Computers Ltd | Co Durham | 2009 |
| Axton's Staircases Ltd | Gravesend | 2025 |
| Axtow Cleaning Solutions Ltd | Mansfield | 2023 |
| Axtron Dynamics Ltd | Coventry | 2025 |
| AXU Anghel Ltd | Bournemouth | 2015 |
| Axup Pipe Supplies Limited | York | 2020 |
| Axxa Ltd | Crewe | 2010 |
| Axxess Identification Limited | Swindon | 1993 |
| Axxis Products Limited | Stanwick | 2013 |
| Axxlabs Limited | London | 2026 |
| Axxonet Global Limited | Leeds | 2014 |
| Axyz Automation (U.K.) Limited | Telford | 1996 |
| Axyz Engineering Limited | Fife | 2001 |
| AY Autos Limited | Harlow | 2016 |
| AY DEE KAY Limited | Edinburgh | 2014 |
| AY UP Duck Aerospace Ltd | Leek | 2024 |
| AYA Cloud Ltd | London | 2024 |
| AYA Food Service Limited | London | 2024 |
| AYA Gold Ltd | Manchester | 2024 |
| AYA Home and Soap Company Limited | Southampton | 2016 |
| AYA Moire Limited | Enfield | 2021 |
| AYA Watches Ltd | London | 2023 |
| Ayaan Textiles Ltd | Manchester | 2025 |
| Ayaba & Co Limited | St. Helens | 2025 |
| Ayababj Limited | Sale | 2026 |
| Ayakhe Holdings Ltd | Swindon | 2020 |
| Ayan Adiyan Co. Ltd | London | 2025 |
| Ayan Tyre Services Ltd | St. Helens | 2025 |
| Ayas Jewelry Ltd | London | 2026 |
| Ayasa Instruments UK Ltd | London | 2026 |
| Ayashi Graphics Ltd | Milton Keynes | 2026 |
| Ayaz Tailoring Limited | Upminster | 2017 |
| AYC Sports Trader Ltd | Birmingham | 2018 |
| Aycee Apothec Ltd | Winchester | 2024 |
| Aychefs Consultancy Services Ltd | London | 2020 |
| Aycliffe Engineering Limited | Newton Aycliffe | 1947 |
| Aycliffe Fabrications Limited | Newton Aycliffe | 2001 |
| Aycliffe Filtration Limited | Darlington | 2009 |
| Aycliffe Technology Limited | Surrey | 1998 |
| Aydee's Ice Cream Ltd | Covent Garden | 2025 |
| Ayden Rose Ltd | Beauly | 2023 |
| Aydenke Limited | Cardiff | 2023 |
| Aydin Acar Yacht Glass Ltd | London | 2025 |
| Aydin Catering Limited | Cardiff | 2020 |
| Aydincake Ltd | London | 2020 |
| Aydo Electric Innovation Ltd | Leeds | 2023 |
| Aydon Silver & Co Ltd. | Caverswall Lane | 1979 |
| AYE Pickled Limited | 3 Semple Street | 2019 |
| Ayed Ltd | Bishop Auckland | 2020 |
| Ayeesha Trading Ltd | Manchester | 2024 |
| Ayeishakaycandles Ltd | Knottingley | 2022 |
| Ayelectrical Ltd | Mitcham | 2026 |
| Ayesh London Ltd | Hatfield | 2024 |
| Ayesha Taylor Limited | London | 2024 |
| AYF Limited | Wisbech | 2015 |
| AYG Construction Limited | Borehamwood | 2019 |
| Ayhtas (PVT) Ltd | London | 2025 |
| Ayif Ltd | London | 2023 |
| Ayiitey Limited | London | 2024 |
| Ayire Ltd | Birmingham | 2025 |
| Aykin Design Limited | London | 2006 |
| Aykome UK Limited | Manchester | 2021 |
| Ayla Roasted Nuts and Coffee Limited | Greenford | 2019 |
| Ayla's Bakery Limited | London | 2026 |