| Adventure Events Ltd | Glasgow | 2022 |
| Adventure Expeditions | Hathersage | 2016 |
| Adventure Expertise Ltd | Hathersage | 2010 |
| Adventure Fields Ltd | Sheffield | 2025 |
| Adventure First Ltd | Inverurie | 2009 |
| Adventure for ALL Ltd | Poundbury | 2014 |
| Adventure Forest Group Limited | Bury St Edmunds | 2006 |
| Adventure Forest Limited | Bury St Edmunds | 2001 |
| Adventure Golf (Oxford) Limited | Swindon | 2017 |
| Adventure Golf Hub Limited | Penrith | 2024 |
| Adventure Golf Island Limited | Belfast | 2006 |
| Adventure Highland Ltd | Beauly | 2017 |
| Adventure Island Barry Island Ltd | Barry | 2024 |
| Adventure Island Playbarn Ltd | Bishop'S Stortford | 2010 |
| Adventure Kidz Limited | Chatham | 2010 |
| Adventure Leisure Limited | Surrey | 1984 |
| Adventure Makers Ltd | Carnforth | 2025 |
| Adventure Mini Golf Ltd | Warrington | 2007 |
| Adventure Mountain Limited | Truro | 2013 |
| Adventure Nene Ltd | Stamford | 2018 |
| Adventure North East Ltd | Redcar | 2023 |
| Adventure Oban Ltd | Oban | 2021 |
| Adventure Parc Snowdonia Limited | Manchester | 2012 |
| Adventure Parks Limited | Driffield | 2021 |
| Adventure Pictures (Tango) Limited | | 1995 |
| Adventure Pirate Ltd | Poole | 2017 |
| Adventure Play Limited | Hitchin | 2009 |
| Adventure Play Town Ltd | Melton | 2023 |
| Adventure Pursuits Limited | Chippenham | 2016 |
| Adventure Queens Ltd | Guildford | 2021 |
| Adventure Racing Limited | Kent | 2007 |
| Adventure Riding Academy Limited | Hailsham | 2010 |
| Adventure Riding Experience Ltd | Cheltenham | 2019 |
| Adventure River Ltd | Monmouth | 2014 |
| Adventure South Ltd | Kingsbridge | 2016 |
| Adventure Sports (Warwickshire) Limited | Warwick | 1987 |
| Adventure Sports Limited | Clevedon | 2005 |
| Adventure Training Limited | Halifax | 1989 |
| Adventure Village Grimsby Limited | Grimsby | 2024 |
| Adventure Ways Community Interest Company | Northampton | 2011 |
| Adventure With US Ltd | Havant | 2021 |
| Adventure Zone Soft Play Limited | Rugby | 2006 |
| Adventureland Limited | Walsall | 2005 |
| Adventureland Soft Play Ltd | Cheltenham | 2025 |
| Adventurers Getaway Ltd | Diss | 2026 |
| Adventures From Qatar Limited | Romford | 2025 |
| Adventures in Acting Ltd | Doncaster | 2024 |
| Adventures in Apparel Ltd | London | 2022 |
| Adventures in Music Making Limited | Henley-On-Thames | 2002 |
| Adventures Online Limited | Petersfield | 2016 |
| Adventures Sports Systems and Timing Ltd | Hounslow | 2023 |
| Adventures With Will Ltd | Hereford | 2018 |
| Adventureventure Ltd | Nottingham | 2022 |
| Adventurous Activity Company Limited | Bristol | 2000 |
| Adventurous EWE Limited | Conwy | 2011 |
| Adventurous Horizons Ltd | Hyde | 2016 |
| Adverse Camber Productions | Bournemouth | 2009 |
| Adverse Effect by Anietie Ekong Ltd | Stevenage | 2026 |
| Adversity Fitness Limited | Glasgow | 2023 |
| Advertising, Design and Print Limited | Swindon | 2003 |
| Advhq Limited | Wantage | 2021 |
| Advocate Art Limited | London | 1994 |
| ADW Creative Limited | Salisbury | 2014 |
| Adwaney Reformer Pilates Limited | London | 2024 |
| Adwen House Publishing Limited | Kingston Upon Thames | 2018 |
| Adworks Design Ltd | Leighton Buzzard | 1999 |
| ADX Performance Ltd | Barnard Castle | 2025 |
| ADX Sports Limited | Edinburgh | 2017 |
| ADY Smith OFF Road Experience Ltd | Preston | 2016 |
| ADY Watts Enterprises Limited | Hereford | 2012 |
| Adyn Ltd | Middlesbrough | 2017 |
| Adys Gym Ltd | Sutton-In-Ashfield | 2020 |
| ADZ Milli Limited | London | 2021 |
| ADÉ Black Ltd | London | 2025 |
| AE Creative Studio Limited | Potters Bar | 2026 |
| AE Gyms Ltd | Aberdeen | 2018 |
| AE Markovc Limited | Ipswich | 2022 |
| AE Performance Centre Ltd | Launceston | 2024 |
| AE Ride Days Ltd | Doncaster | 2024 |
| AE Rosario Ltd | Colchester | 2023 |
| AEA Coaching Ltd | Gainsborough | 2025 |
| Aeadanis Ltd | London | 2024 |
| Aeaea Studios Ltd | London | 2024 |
| AEC Arts Ltd | London | 2026 |
| AEC Boxing Ltd | Orpington | 2026 |
| AEC Society Limited | Buntingford | 2004 |
| AEG Sports Ltd | North Walsham | 2020 |
| Aegis Training Ltd | Chesham | 2005 |
| Aegle Intuitive Fitness Limited | Royston | 2020 |
| AEI Live Limited | London | 2011 |
| AEI Music Limited | London | 2007 |
| Aeia Ltd | Witney | 2025 |
| AEK Musical Services Ltd | London | 2020 |
| Aek-Boco FC Ltd | Bristol | 2005 |
| Aek-Boco FC Trading Ltd | Bristol | 2009 |
| AEM Events Ltd | Leicester | 2019 |
| Aeme Fitness Limited | Dunmow | 2025 |
| Aemp Limited | Tunbridge Wells | 2006 |
| Aeolus World Wide Ventures(Uk) Ltd | Wimborne Minster | 2011 |
| Aeon Black Creative Limited | London | 2019 |