| Alliance Sports Limited | London | 2024 |
| Allideas Limited | Leicester | 2005 |
| Allie Athanasio Ltd | London | 2023 |
| Allied Dancing Association Limited | Ormskirk | 1944 |
| Allied International Filmmakers Limited | London | 2026 |
| Allied Solutions Group Limited | Edgware | 2005 |
| Allinches Ltd. | Ely | 2020 |
| Allingham Ltd | Lewes | 2014 |
| Allinghams Creative and Media Ltd | Gerrards Cross | 2014 |
| Allington Millennium Green Limited | London | 2010 |
| Allington Services Limited | Cardiff | 2021 |
| Allison's Fitness Factory Limited | Coventry | 2009 |
| Allister Malcolm Glass Limited | Wolverhampton | 2018 |
| Alliston Gardens Youth & Community Centre | Northampton | 2011 |
| Alliz Playgym Ltd | Halifax | 2015 |
| Allman Brown Limited | Manchester | 2017 |
| Alloa Football and Athletic Club, Limited | Alloa | 1919 |
| Alloneproductions Limited | London | 2017 |
| Allornothing Fitness & Nutrition Ltd | Cumbernauld | 2018 |
| Alloro Competizione Limited | Norwich | 2024 |
| Allotment Live Ltd | Reading | 2024 |
| Allouaqui Dance Theatre Ltd | Trowbridge | 2019 |
| Allout Adventures Limited | Hexham | 2008 |
| Allout Games Limited | Romford | 2019 |
| Allowed Music Opco Ltd | Manchester | 2026 |
| Allpark Leisure Limited | Shoreham-By-Sea | 2014 |
| Allplay Padel Limited | Worthing | 2024 |
| Allround Tech Services Limited | Rushden | 2012 |
| Allrunners Limited | London | 2014 |
| Allsafety Limited | Langley Park | 2009 |
| Allsaints Studio (ST Albans) Limited | St. Albans | 2017 |
| Allscott Sports Club Ltd | Telford | 2022 |
| Allsetsport Limited | Manchester | 2025 |
| Allsopp Contemporary Art Limited | London | 2004 |
| Allsorts Cardiff Limited | South Glamorgan | 1997 |
| Allsorts Fireworks Limited | Leeds | 2017 |
| Allsorts Group Ltd | Kidlington | 2022 |
| Allsorts Inflatables Limited | Surrey | 2003 |
| Allsorts Media Ltd | Milton Keynes | 2026 |
| Allsorts Swimming Club IOW CIC | Sandown | 2025 |
| Allspeeches Limited | Etchingham | 2015 |
| Allsports Coaches Coaching Academy CIC | Telford | 2020 |
| Allsports Service Ltd | York | 2018 |
| Allstar Cheer Dance & Gymnastics Limited | Stonehaven | 2022 |
| Allstar Climbing Ltd | Loughborough | 2026 |
| Allstar Fireworks Limited | Uxbridge | 1999 |
| Allstar Futures Limited | Wolverhampton | 2025 |
| Allstar Performing Arts Centre Ltd | Kilmarnock | 2020 |
| Allstars Dance Academy CIC | Ballyclare | 2025 |
| Allstars Football Arena Limited | Peterborough | 2024 |
| Allstars Minigolf Limited | London | 2025 |
| Allstars Production Ltd | Henlow | 2026 |
| Allstars Sport and Mentor Academy Limited | Orpington | 2017 |
| Allstarz Productions Limited | Wickford | 2016 |
| Allstunts Film Inc Limited | London | 2024 |
| Allstunts Inc Equipment Limited | Harrow | 2007 |
| Allt-Yr-Yn Lawn Tennis Club Limited | Newport | 2020 |
| Allthedarts Ltd | Cheltenham | 2025 |
| Allthrivenw CIC | Leyland | 2026 |
| ALLTICKETS4U Ltd | Hounslow | 2025 |
| Alltrack Promotions Limited | Nelson | 2016 |
| Allwrite Ltd | Newquay | 2017 |
| Ally & G Ltd | London | 2023 |
| Ally Consultancy & Design Limited | Farnham | 2014 |
| Ally Macleod Physique Coaching Ltd | Glasgow | 2026 |
| Ally Rosez PVT Ltd | Glasgow | 2021 |
| Ally Zetterberg Literary Limited | Sheffield | 2022 |
| ALM Records Limited | Houghton Le Spring | 2017 |
| Alma Arts Limited | Shaftesbury | 2019 |
| Alma Berrow Ltd | Dorchester | 2020 |
| Alma Consort Ltd | London | 2025 |
| Alma DE Cuba Limited | Nottingham | 2017 |
| Alma Norwich Ltd | Norwich | 2024 |
| Alma Rose Music Ltd | Newcastle Under Lyme | 2021 |
| Alma Singer Ltd | London | 2023 |
| Alma Studio Limited | London | 2019 |
| Alma Theatre Limited | Bristol | 2025 |
| Almalynn Limited | Nr. Leatherhead | 1978 |
| Almanico Limited | Brentford | 1999 |
| Almantas Petkunas Ltd | London | 2022 |
| Almat Creative Ltd | Alford | 2023 |
| Almay Scenic Limited | Kings Langley | 2023 |
| Almeida Productions Limited | London | 1984 |
| Almeida Theatre Company Limited | London | 1981 |
| Almg | Newry | 2024 |
| Almi Productions Limited | London | 1991 |
| Almighty / Street Gang Limited | North Shields | 2025 |
| Almighty Fighting Championship Ltd | Birmingham | 2026 |
| Almighty JIU Jitsu CIC | Sunderland | 2026 |
| Almighty Trafford Limited | London | 2019 |
| Almo Leisure Ltd | Glasgow | 2011 |
| Almond Equestrian Limited | Leicester | 2022 |
| Almond Sport Horses Ltd | Edinburgh | 2017 |
| Almond Valley Heritage Trust | Livingston Village | 1984 |
| Almost Autumn Limited | Winsford | 2016 |
| Almost Everything London Limited | London | 2016 |
| Almost Impossible Ltd | High Wycombe | 2011 |
| Almsborough Ltd | London | 2003 |
| Almustashara Satellite Television Channel Ltd | Newcastle Upon Tyne | 2015 |
| Alne Fitness Limited | York | 2024 |