| AKS Leisure Limited | Leigh-On-Sea | 2018 |
| Akshna Chessmate Limited | Croydon | 2023 |
| Akta Productions Ltd. | Cottingham | 2021 |
| Aktiviti Ltd | Wigan | 2022 |
| Akua Music Ltd | London | 2025 |
| Akubless Limited | London | 2023 |
| Akulun Ltd | Gloucester | 2026 |
| Akwaaba Music Limited | Manchester | 2012 |
| Akwamarine Limited | Southampton | 2004 |
| AL Aesthetic + Medical Tattooing Ltd | London | 2026 |
| AL Artisan Ltd | Dagenham | 2023 |
| AL Asayl Bloodstock Ltd | Newmarket | 2012 |
| AL Campbell Author Limited | Horsham | 2021 |
| AL Doyle Ltd | London | 2010 |
| AL Entertainment Limited | Preston | 2023 |
| AL Fitness Ltd | Dunfermline | 2018 |
| AL Fresco Entertainment Ltd | Bristol | 2025 |
| AL Gambling Consulting Ltd | Crawley | 2020 |
| AL HAQ Fitness Ltd | Oldham | 2025 |
| AL Kamel Systems UK Ltd | London | 2025 |
| AL Management Services Ltd | Cheadle | 2018 |
| AL Murphy Limited | York | 2009 |
| AL Nakheel Entertainment Ltd | London | 2025 |
| AL Nujaifi Racing Limited | Leeds | 2012 |
| AL Pilates Limited | Bromsgrove | 2025 |
| AL Salsa Limited | Llanelli | 2013 |
| AL Seed Productions Ltd | Glasgow | 2022 |
| AL Shaqab Racing UK Limited | Hungerford | 2014 |
| AL Simpson Music Limited | Hitchin | 2022 |
| AL UK Fitness Ltd | Upminster | 2025 |
| AL Webber Ltd | London | 2022 |
| Al's Fitness Limited | Carmarthen | 2018 |
| Al'Z Gym Limited | Oldham | 2003 |
| Al-Fekaiki Art Ltd | Morden | 2025 |
| Al-Mahdi Association | Leicester | 2017 |
| AL1 Events Limited | London | 2024 |
| AL1V3 Ltd | London | 2024 |
| AL22 Ltd | Derby | 2013 |
| AL4FITNESS Ltd | London | 2026 |
| ALA Marketing Ltd | Leeds | 2025 |
| Alabaster Jars Ltd | Oldham | 2021 |
| Alabaster Productions Ltd | Norwich | 2019 |
| Alac Services Limited | Chesham | 2019 |
| Aladdin Management Limited | Edgware | 1997 |
| Aladdins Cave Marquees & Events Ltd | Liverpool | 2025 |
| Aladdins Members Club (Ilford) Limited | Cardiff | 2018 |
| Aladukeh London Ltd | Bicester | 2024 |
| Alain Baxter Sports Limited | Grangemouth | 2009 |
| Alain Sign Racing Limited | Waterlooville | 2016 |
| Alakasam Ltd | Doncaster | 2018 |
| Alakazam Magic Limited | Ashford | 2008 |
| Alake Olarewaju Ltd | London | 2018 |
| Alan B Baker Ltd | Ringmer | 2006 |
| Alan Ball Academy Football Coaching Limited | Southampton | 2026 |
| Alan Barnes Music Limited | Stockport | 2013 |
| Alan Bennett Racing Ltd | Doncaster | 2001 |
| Alan Black Fitness Limited | Cowdenbeath | 2024 |
| Alan Black Nutrition Limited | Cowdenbeath | 2024 |
| Alan Brodie Representation Limited | London | 1997 |
| Alan Bushell Racing Ltd | Port Talbot | 2018 |
| Alan Carson Fitness Ltd | Corby | 2014 |
| Alan Cottam Agency Limited | Lancashire | 2007 |
| Alan Creighton Racing Ltd | Banbury | 2025 |
| Alan Derbyshire Art Conservation Limited | London | 2015 |
| Alan Edward Ramsey Ltd | London | 2021 |
| Alan Field Music Publishing Ltd | London | 2010 |
| Alan Firth Limited | Carnforth | 2003 |
| Alan Friend Limited | Leatherhead | 2008 |
| Alan G B Ltd | Wisbech | 2016 |
| Alan Goldsmith Organisation Limited | London | 1981 |
| Alan J. Logan Ltd. | Glasgow | 2002 |
| Alan Janes Limited | St. Albans | 2003 |
| Alan King Racing Limited | Swindon | 1999 |
| Alan Kingsbury Limited | Cornwall | 2002 |
| Alan MAC Feely Ltd | Burton-On-Trent | 2012 |
| Alan Manson Grip Services Ltd | Glasgow | 2023 |
| Alan March Sport Limited | Loughborough | 2012 |
| Alan Mccloskey Ltd. | Glasgow | 2007 |
| Alan Mchugh Limited | Glasgow | 2012 |
| Alan Power Limited | Radstock | 2026 |
| Alan Rodo Limited | Seaton | 2004 |
| Alan Smith Enterprises Limited | Leeds | 2002 |
| Alan Soutar Darts Limited | Brierley Hill | 2021 |
| Alan Strachan Personal Training Ltd | Glasgow | 2013 |
| Alan Waldock Ltd | Bournemouth | 2013 |
| Alan Waugh Limited | Glasgow | 2004 |
| Alan Williams Entertainments Limited | London | 1976 |
| Alan Williams Musical Director Ltd | Manchester | 2016 |
| Alan Zada Ltd | Worthing | 2026 |
| Alancalder Ltd | Ely | 2025 |
| Alando London Limited | London | 2003 |
| Alandscapes Limited | Wokingham | 2006 |
| Alannalherbert Ltd | Lincoln | 2026 |
| Alanturton.Com Limited | Stourport On Severn | 2012 |
| Alara Entertainment Ltd | Prescot | 2024 |
| Alare Productions Limited | Stockport | 2023 |
| Alasdair Good Ltd | Gullane | 2016 |
| Alaseyori Global Limited | Basildon | 2024 |
| Alastair Davey Ltd | London | 2023 |
| Alastair Macandrew Limited | Yeovil | 1998 |