| Alttio Ltd | Grantham | 2019 |
| Altura Creations Ltd | London | 2020 |
| Altura Padel Sports Ltd | Wimborne | 2025 |
| Alturas Productions Ltd | London | 2020 |
| Alturas Theatre Company | London | 2021 |
| Altus Sports Management Ltd | Lewes | 2015 |
| Altx Gym Limited | Liverpool | 2021 |
| Altytude Fitness Limited | London | 2026 |
| Aluin Ltd | London | 2023 |
| Alula Wellness Limited | Bristol | 2026 |
| Alun Callender Photography Limited | Brighton | 2015 |
| Alun Darbyshire Limited | Banbury | 2023 |
| Aluna Care CIC | Leeds | 2025 |
| Aluna Entertainment Limited | Bromsgrove | 2021 |
| Aluna Limited | Llangadog | 2002 |
| Aluna Studio Ltd | Liverpool | 2026 |
| Aluna Vision Limited | Bromsgrove | 2021 |
| Aluna Wellness Ltd | Rochester | 2025 |
| Aluto Fitness & Wellbeing Ltd | Frodsham | 2022 |
| Alvechurch FC Community Ltd | Birmingham | 2022 |
| Alvechurch Football Club Limited | Birmingham | 1995 |
| Alvechurch Gymnastics Club Limited | Droitwich | 2025 |
| Alveley Community Centre Community Interest Company | Bridgnorth | 2026 |
| Alverstoke Pickleball Club Limited | Eastleigh | 2025 |
| Alvez Vision Productions Ltd | London | 2024 |
| Alvin Ltd | Durham | 2025 |
| Alvis Owner Club Limited | Oxford | 2000 |
| Alwan Essex Limited | Ingatestone | 2024 |
| Always Acting UP Ltd | Ramsey Forty Foot | 2020 |
| Always AIM High Community Events Limited | Llangefni | 2015 |
| Always AIM High Events Ltd | Llanberis | 2010 |
| Always BE Creative Ltd | London | 2024 |
| Always Believe Football Club Ltd | London | 2023 |
| Always Business Entertainment Ltd | London | 2017 |
| Always Fit Ltd | Burton-On-Trent | 2018 |
| Always Glasgow (NO.2) Limited | Glasgow | 2025 |
| Always in Motion Ltd | London | 2024 |
| Always Live Ltd | Westcliff-On-Sea | 2019 |
| Always Open Golf Limited | York | 2026 |
| Always Outdoors Ltd | Malvern | 2022 |
| Always Ready Club Limited | Dumfries | 2024 |
| Always Ready Fit Box Limited | Dumfries | 2024 |
| Always Strive to Ltd | Kirkcaldy | 2016 |
| Always Trying Racing Syndicate Limited | Worksop | 2023 |
| Alwaysshaw.Co.Uk Limited | Cleckheaton | 2019 |
| ALX Group Ltd | Swindon | 2026 |
| Alx-Photo Ltd | Bracknell | 2023 |
| Alycidon Properties Limited | Ilkeston | 2019 |
| Alys Williams & Company Ltd | Glasgow | 2026 |
| Alyson Charles Limited | Sheffield | 1995 |
| Alyson ORR Limited | Glasgow | 2006 |
| Alyth & District Agricultural Show Society | Perth | 2015 |
| Alyx Limited | Hove | 2020 |
| ALZ USA Ltd | Waterlooville | 2023 |
| AM Acting Limited | Bredbury | 2021 |
| AM Biznus Ltd | London | 2016 |
| AM Business Group Ltd | London | 2025 |
| AM Creative Designs Limited | Edgware | 2013 |
| AM Crook Productions Ltd | London | 2019 |
| AM Culture Ltd | London | 2024 |
| AM Entertainment Ltd | Wells | 2019 |
| AM Fitness (Yorkshire) Limited | Sheffield | 2018 |
| AM Fitness and Health Ltd | Doncaster | 2026 |
| AM Fitness Coach Limited | Leigh-On-Sea | 2022 |
| AM Fitness Ltd | Cupar | 2013 |
| AM Fives Ltd | Glasgow | 2018 |
| AM Golf Ltd | Belfast | 2025 |
| AM Graphic Design Ltd | Kidlington | 2011 |
| AM Griffiths Music Ltd | Beckenham | 2015 |
| AM Legacy Sports Consult Limited | Harlow | 2023 |
| AM Motorsports Ltd | London | 2026 |
| AM One Services Limited | London | 2023 |
| AM Personal Training Ltd | London | 2020 |
| AM Physique Ltd | Cheadle | 2020 |
| AM PM Collective Ltd | Hutton, Brentwood | 2025 |
| AM Production Design Limited | London | 2015 |
| AM Racing Limited | Hull | 2021 |
| AM Sport Consultants Limited | Weymouth | 2024 |
| AM Sports Academy Ltd | London | 2014 |
| AM Sports and Coaching Ltd | Kington | 2025 |
| AM Sports Coaching Limited | London | 2025 |
| AM Sports Events Ltd | Farnborough | 2026 |
| AM Sports Health Limited | Eastbourne | 2025 |
| AM Sports Management Ltd | Guildford | 2025 |
| AM Tennis Ltd | Warrington | 2019 |
| AM TEX Training Ltd | Leeds | 2024 |
| AM Theatrical Limited | London | 2019 |
| Am-Dm Ltd | Plymouth | 2011 |
| Am/Fm Limited | London | 2022 |
| AM06 Promotions Limited | Newport | 2025 |
| AM13 Entertainment Ltd | London | 2025 |
| AM2PM Music Limited | Chislehurst | 2017 |
| AM7 Sports Ltd | Loughborough | 2025 |
| AM9 Promotions Ltd | Newport | 2022 |
| Am:Pm Events Limited | Borehamwood | 2025 |
| AMA Factory Ltd | Pontypool | 2026 |
| AMA Fest Global Ltd | London | 2022 |
| AMA Louise Ltd | Welwyn Garden City | 2024 |
| AMA Music Ltd | Richmond | 2021 |
| AMA Soccer Ltd | London | 2019 |