| Asterion Europe Limited | Warrington | 2014 |
| Asterion Films Limited | Edinburgh | 2023 |
| Asterion Technologies Limited | Romsey | 2020 |
| Asterion Technology Limited | Luton | 2023 |
| Asterios Ltd | London | 2022 |
| Asteris AI Ltd | Altrincham | 2025 |
| Asterisk Business Systems Limited | Bracknell | 2019 |
| Asterisk Consulting Limited | Slough | 2022 |
| Asterisk Digital Limited | London | 2025 |
| Asterisk Films Limited | London | 2014 |
| Asterisk Media Productions Ltd. | Biggleswade | 2019 |
| Asterism Consulting Limited | Cardiff | 2014 |
| Asterius Technologies Limited | Lincoln | 2021 |
| Asterius Technology Limited | Lincoln | 2021 |
| Asterix the Voices Limited | London | 2015 |
| Asterlogic Limited | London | 2014 |
| Asternovus Ltd | Benfleet | 2022 |
| Astero Digital Ltd | Cardiff | 2024 |
| Asteroid Films Ltd | London | 2018 |
| Asteroid Media Productions Limited | Tunbridge Wells | 2025 |
| Asteroid Pictures Ltd | Newbury | 2022 |
| Asteroid Productions Limited | Glasgow | 2019 |
| Asteroid Studios Limited | London | 2020 |
| Asteron Energy Ltd | Lytham St. Annes | 2026 |
| Asterope Telecommunications Ltd | London | 2020 |
| Asterox Limited | Liverpool | 2021 |
| Astersim Ltd | Bury St. Edmunds | 2026 |
| Asterstrix Ltd | Alyth, Blairgowrie | 2023 |
| Astery Ltd | London | 2022 |
| Astetech Limited | London | 2013 |
| Asteur Films Ltd | Mitcham | 2014 |
| Astex Consulting Limited | Coleshill | 2015 |
| Asteyasoul Ltd | Bristol | 2025 |
| Astha Solutions Ltd | Langley | 2022 |
| Astha World Limited | London | 2023 |
| Astikaya Ltd | Watford | 2021 |
| Astil Limited | St. Albans | 2024 |
| Astin IT Solutions Ltd | Birmingham | 2023 |
| Astin Tech Solutions Ltd | Bromsgrove | 2025 |
| Astinori Ltd | London | 2024 |
| Astir Consultants Ltd | Lossiemouth | 2022 |
| Astir Solutions Limited | Basingstoke | 2014 |
| Astir Studio Limited | London | 2022 |
| Astito Ltd | London | 2023 |
| Astkiba Ltd | London | 2025 |
| Astle Regis Design Ltd | Church Stretton | 2014 |
| Astley Digital Group Limited | Accrington | 2024 |
| Astmine Technical Ltd | Wimborne | 2022 |
| Asto Ventures Ltd | Leeds | 2026 |
| Astolinks International Ltd | Nottingham | 2023 |
| Aston AI Limited | London | 2016 |
| Aston Berkeley Systems Limited | Lymm | 1998 |
| Aston Business Intelligence Ltd | London | 2024 |
| Aston Business Solutions Limited | Princes Risborough | 2018 |
| Aston Carter Limited | London | 1997 |
| Aston Carter Tracks Ltd | Reading | 2017 |
| Aston Cavendish Limited | Manchester | 2020 |
| Aston Clinton Ltd | London | 1998 |
| Aston Creative Limited | Chepstow | 2006 |
| Aston Data & Electrical Ltd | Milton Keynes | 2015 |
| Aston Europe Ltd | Stroud | 2024 |
| Aston H-S Ltd | London | 2024 |
| Aston Informatics Ltd | Birmingham | 2024 |
| Aston Media Productions Limited | Stevenage | 2017 |
| Aston Metrics Ltd | Bury St. Edmunds | 2026 |
| Aston MGT Ltd | London | 2026 |
| Aston MTB Ltd | Bolton | 2021 |
| Aston Nash Limited | Birmingham | 2010 |
| Aston Park Education Consulting Limited | Newcastle Upon Tyne | 2015 |
| Aston Productions Limited | Henley On Thames | 2015 |
| Aston Programs Limited | Farnham | 2011 |
| Aston Reach Ltd | Cheltenham | 2021 |
| Aston Read Limited | Woking | 2005 |
| Aston Smith Ltd | Stockport | 2013 |
| Aston Stott Consulting Limited | Middlewich | 2015 |
| Aston Systems Limited | London | 2023 |
| Aston Talent Agency Ltd | Shefford | 2024 |
| Aston Training Limited | Little Plumstead | 2006 |
| Aston Ventures Group Limited | London | 2025 |
| Astonbuttler Solutions Limited | London | 2019 |
| Astondale Limited | Watford | 2015 |
| Astondev Ltd | London | 2025 |
| Astonio Ltd | London | 2016 |
| Astonish AI Ltd | Reading | 2026 |
| Astonish Email Limited | Andover | 2013 |
| Astonishing Entertainment Limited | London | 2012 |
| Astonishtech Limited | Glasgow | 2022 |
| Astonrange Limited | Leigh-On-Sea | 1992 |
| Astons Online CIC | Didcot | 2024 |
| Astontrend Limited | Morden | 2015 |
| Astonvfx Limited | Gerrards Cross | 2018 |
| Astonwell Projects Ltd | Rayleigh, | 2000 |
| Astop Limited | London | 2013 |
| Astor Consultants Ltd | Buckden | 2019 |
| Astor Films Ltd | Newbury | 2022 |
| Astor Media Limited | Maidstone | 2022 |
| Astora Risk Ltd | London | 2026 |
| Astorga Softworks Ltd | London | 2025 |
| Astoria Advisory Group Ltd | Hamilton | 2025 |
| Astoria Pictures Ltd | London | 2025 |