| Asc-Mascot C.I.C. | Brighton | 2019 |
| Ascalon Canine Care Limited | Woodbridge | 2022 |
| Asccei Media Ltd | Silsoe | 2025 |
| Ascea Ltd | Warwick | 2020 |
| Ascencio Limited | London | 2018 |
| Ascend Birds Ltd | Carshalton | 2025 |
| Ascend Business Company Ltd | Manchester | 2021 |
| Ascend Co Studio Ltd | Manchester | 2025 |
| Ascend Hair Limited | New Milton | 2011 |
| Ascend Media & Marketing Limited | Leeds | 2023 |
| Ascend Medical Aesthetics Ltd | Wigan | 2025 |
| Ascend Performance Ltd | Brighton | 2021 |
| Ascend Project Solutions Limited | Warrington | 2016 |
| Ascend Recruitment Services Limited | Manchester | 2025 |
| Ascend Safety Ltd | Grimsby | 2026 |
| Ascend+ Ltd | London | 2025 |
| Ascendah CIC | Oldham | 2025 |
| Ascendance IT Limited | Basildon | 2019 |
| Ascendance London Ltd | London | 2024 |
| Ascendant Communications Consultancy Limited | Twickenham | 2003 |
| Ascendant Fiduciaries Ltd | Great Yarmouth | 2025 |
| Ascendaxis Group Ltd | London | 2024 |
| Ascender Holdings Limited | Tunbridge Wells | 2020 |
| Ascendiasurrico Ltd | Chaldon | 2015 |
| Ascending Asset Advisors Limited | Shipley | 2021 |
| Ascending Mindset Limited | Crawley | 2025 |
| Ascens:On Limited | Bournemouth | 2020 |
| Ascension Access Ltd | Scunthorpe | 2025 |
| Ascension Cleaning Services Limited | Croydon | 2017 |
| Ascension Coaching Services Ltd | Horndean | 2024 |
| Ascension Consulting Ltd | Market Harborough | 2021 |
| Ascension FE Limited | London | 2021 |
| Ascension Leadership Ltd | Hertford | 2023 |
| Ascension Road Ltd | Surbiton | 2024 |
| Ascent Aviation Advisers Ltd | London | 2025 |
| Ascent Partners Consulting Ltd | Leatherhead | 2025 |
| Ascent Rentals Ltd | Pulborough | 2019 |
| Ascentae Limited | Newbury | 2016 |
| Ascentis Management Ltd | Bradford | 2024 |
| Ascentris Limited | London | 2025 |
| Ascf Global Limited | London | 2020 |
| Ascf Ltd | Langport | 2002 |
| Ascherberg,Hopwood & Crew Limited | London | 1906 |
| Aschotti Limited | London | 2026 |
| Asclean (Midlands) Ltd | Solihull | 2003 |
| Ascm Ltd | London | 2022 |
| Ascn 65 Ltd | Handcross | 2022 |
| Asco UK Limited | Aberdeen | 1954 |
| Ascona (PRS) Limited | Pembroke Dock | 2017 |
| Ascort Ltd | London | 2018 |
| Ascot Building Consultancy Limited | Telford | 2025 |
| Ascot Car Wash Ltd | Gateshead | 2019 |
| Ascot Catering and Event Hire Ltd | Gainsborough | 2008 |
| Ascot Chase Ltd | London | 2013 |
| Ascot DRY Cleaners Limited | Ascot | 2016 |
| Ascot Healthcare Services Limited | Chesham | 2013 |
| Ascot Life Church | Ascot | 2010 |
| Ascot Medispa Ltd | Ascot | 2024 |
| Ascot Nail Salon Ltd | London | 2021 |
| Ascott Beauty Clinic Beckenham Ltd | Beckenham | 2014 |
| Ascott Coaching Limited | Bisley | 2025 |
| ASD Administrative Services Department UK Limited | Ashford | 2010 |
| ASD Car Glass Ltd | London | 2022 |
| ASD Services Inc Ltd | London | 2026 |
| ASD2 Limited | Bury St. Edmunds | 2023 |
| Asda Southbank Limited | Leeds | 1992 |
| Asdak Consultancy Limited | Romford | 2024 |
| Asden House Nominees Limited | West Bromwich | 1992 |
| Asdl UK Limited | Maidstone | 2018 |
| Asdma Ltd | High Wycombe | 2019 |
| ASE 100 Limited | Hastings | 2025 |
| ASE Asset Operations Limited | London | 2023 |
| ASE Construction Ltd | Northolt | 2019 |
| ASE Media Limited | Gainsborough | 2023 |
| ASE Procurement Services Limited | London | 2023 |
| ASE Vertice Consultancy Limited | Luton | 2017 |
| Asea Beauty Limited | Loughton | 2025 |
| Asean ST. Andrew Society Limited | Aberdeen | 2022 |
| Asean UK Business Forum (Aubf) Ltd | Croydon | 2025 |
| Aseda Home Ltd | London | 2022 |
| Aseda Press Ltd | London | 2019 |
| Asehealthcare UK Limited | London | 2021 |
| Asembo UK Limited | Stamford | 2012 |
| Asena Glasgow Ltd | Glasgow | 2018 |
| Asena Trade Ltd | Wembley | 2022 |
| Asens Barber Crew Ltd | Bridgwater | 2018 |
| Aser Production Limited | Liverpool | 2025 |
| Aserene Aesthetics and Laser Clinic Limited | London | 2018 |
| ASF Waterproofing Specialists Limited | Dartford | 2011 |
| Asfalto DEL Norte Ltd | London | 2023 |
| Asfour for Services Ltd | Manchester | 2024 |
| Asftech Limited | Hitchin | 2020 |
| ASG & Z Ltd | Hays | 2021 |
| ASG Art Ltd | London | 2025 |
| ASG Car Cleaning Ltd | Milton Keynes | 2018 |
| ASG Hair and Beauty Ltd | Enfield | 2023 |
| ASG1 Limited | London | 2025 |
| ASG2022 Limited | Edinburgh | 2004 |
| Asgala Ltd | Telford | 2024 |
| Asgard Marketing Limited | Alcester | 2011 |