| Aylo Designs Ltd | Rochdale | 2022 |
| Aylsham Community Partnership | Norwich | 2006 |
| Aylsham Community Sports Limited | Norwich | 2014 |
| Aylsham Football Club Limited | Norwich | 2013 |
| Aylsham Sports Hub Limited | Aylsham | 2022 |
| Aymen Boughaba Ltd | London | 2023 |
| Aymies Ltd | Crewe | 2023 |
| Ayna Arts CIC | Manchester | 2025 |
| Ayniab Ltd | Yeovil | 2021 |
| AYO Berry Entertainment Ltd | Swanley | 2011 |
| Ayo'Lamide Art Ltd | Stockton-On-Tees | 2025 |
| Ayoka Folake Ltd | London | 2025 |
| Ayokunle Kreativestudio Ltd | Swanscombe | 2021 |
| Ayomide Ogundayo Textiles Ltd | London | 2024 |
| AYR & District Flower Show | Prestwick | 2017 |
| AYR Fight Team Limited | Cumnock | 2024 |
| AYR Rugby Football Club Limited | Ayr | 2022 |
| AYR United Football Academy Limited | Ayr | 2005 |
| Ayresome Products Ltd | Sheerness | 2008 |
| Ayrey Fitness Limited | Bedford | 2012 |
| Ayriel Millinder Ltd | Whitby | 2018 |
| Ayrshire Bulls Rugby Limited | Ayr | 2022 |
| Ayrshire Curlers Limited | Glasgow | 1972 |
| Ayrshire Swim Hub Ltd | Irvine | 2025 |
| Ayrshire Warriors Ltd | Kilmarnock | 2015 |
| Ayrton Taylor Fitness Ltd | Oldham | 2022 |
| Ayré Studio Ltd | Leighton Buzzard | 2025 |
| Aythorpe Promotions Ltd | Northampton | 2024 |
| Aythorpe Sporting Ltd | Stevenage | 2025 |
| Ayton Enterprise Limited | Shepton Mallet | 2021 |
| Ayuryoga Ltd | Manchester | 2016 |
| Ayus Clinic Ltd | Towcester | 2023 |
| Ayus Treasures Limited | Manchester | 2024 |
| Ayyan Pool Ltd | Ilford | 2024 |
| AZ Aerosports Ltd | Maldon | 2017 |
| AZ Artresin Limited | Aberdeen | 2020 |
| AZ Entertainment Ltd | London | 2019 |
| AZ Fitness Limited | Preston | 2020 |
| AZ HU Sports Group Limited | Solihull | 2025 |
| AZ Shipping Ltd | London | 2025 |
| AZ Sports Insights Ltd | Kent | 2024 |
| AZ Theatre Limited | | 2004 |
| AZ Training & Fitness Ltd | London | 2025 |
| Azaanfit Ltd | London | 2025 |
| Azala Productions Limited | Windlesham | 2022 |
| Azarra Amoy Limited | London | 2022 |
| AZD Productions Ltd | London | 2023 |
| Azema Limited | London | 2017 |
| Azete Ltd | Leicester | 2022 |
| Azfitnessorg Ltd | Houghton Le Spring | 2025 |
| Azhar Mahmood Limited | Morden | 2002 |
| Aziina Limited | London | 2012 |
| Azimut Motorsport Ltd | London | 2025 |
| Azimuth Productions Ltd | Stroud | 2020 |
| Aziz Hoque Ltd | Bristol | 2017 |
| Azizk Limited | London | 2014 |
| Azizo Music Group Ltd | London | 2025 |
| Azkadinya Ltd | Folkestone | 2023 |
| Azlot Ltd | London | 2022 |
| Azmaray Studio Ltd | Bradford | 2025 |
| Azoitei Limited | London | 2008 |
| Azontobox Ltd | Wolverhampton | 2020 |
| Azoom Inc. Ltd | Loughborough | 2023 |
| Azra Owen Ltd | London | 2022 |
| Azstorageuk Ltd | London | 2025 |
| Aztec Adventure Limited | Evesham | 2013 |
| Aztec Adventure Play Ltd | Carlisle | 2023 |
| Aztec Boxing Club CIC | Bradford | 2024 |
| Aztec Facilities Limited | Eastleigh | 2002 |
| Aztec Sets Ltd | Wirral | 2021 |
| Aztec Watersports Limited | Evesham | 2005 |
| Azucar Ltd | Tipton | 2023 |
| Azumi Design Limited | London | 2003 |
| Azure Series Ltd | London | 2025 |
| Azure Swim School London Limited | Thornton Heath | 2022 |
| AZZ Tech Racing Ltd | London | 2024 |
| Azza Mooy Promotions Limited | London | 2018 |
| Azzi Promotions Limited | Newbridge | 2024 |
| Azzurri Ltd | Peterborough | 2017 |
| Azzurro Assets Ltd | Leigh On Sea | 2021 |
| B & a Cosgrove Limited | Cheshire | 1999 |
| B & a Football Project Management Ltd | London | 2025 |
| B & a Snooker & Pool Limited | Accrington | 2004 |
| B & B Ballerz Ltd | Southend-On-Sea | 2025 |
| B & C Leisure Ltd | Lowestoft | 2022 |
| B & E Fitness Ltd | London | 2022 |
| B & E Parkin Leisure Limited | Basildon | 1998 |
| B & J Parr Racing Ltd | Nottinghamshire | 2023 |
| B & J Storage Solutions Ltd | Chorley | 2015 |
| B & L Squires Ltd | Blackpool | 2025 |
| B & M Automatics Limited | Cannock | 1959 |
| B & M Productions Ltd | Hungerford | 2025 |
| B & R Productions Ltd | Hastings | 1999 |
| B & S Croft Limited | Wigan | 2023 |
| B - Fit Fitness Limited | Larbert | 2016 |
| B 1ST Riding School Limited | Stockport | 2008 |
| B 42 Ltd | Cardiff | 2023 |
| B a Education Services Ltd | Brighton | 2024 |
| B Aqua and Animal Feeds Limited | Goole | 2015 |
| B Athletic Ltd | Glasgow | 2025 |