| AS Technical Engineering Ltd | Oldbury | 2019 |
| AS the Deer Limited | Edinburgh | 2023 |
| AS Time Goes by Limited | Southampton | 2011 |
| AS WE ARE NOW Ltd | London | 2025 |
| As&Sd Feast Ltd | Newmarket | 2022 |
| As-P Northern Ltd | Leeds | 2004 |
| As-Tec Chemicals Limited | Preston | 2000 |
| AS23.SPACE Technologies Ltd | Wigston | 2023 |
| AS9 Makes Limited | Taunton | 2025 |
| ASA Applications Ltd | Doncaster | 2026 |
| ASA Crane Services Ltd | Dawlish | 2024 |
| ASA Delicia Limited | Sheffield | 2025 |
| ASA Fabrications Ltd | Stoke-On-Trent | 2022 |
| ASA Fabs Ltd | Stoke-On-Trent | 2011 |
| ASA Fashion Limited | Harrow | 2017 |
| ASA Special Projects Limited | Stoke-On-Trent | 2018 |
| ASA Steel Structures Limited | Crewe | 1987 |
| ASA Stringhoppers Ltd | Hatfield | 2018 |
| ASA Technology Limited | Wetherby | 2017 |
| ASA Trade and Import Limited | London | 2024 |
| ASA UK & Ireland Limited | Liverpool | 2000 |
| ASA1987 Ltd | Cambridge | 2026 |
| Asaba International Limited | London | 1980 |
| Asabrs Ltd | Warrington | 2024 |
| Asad Bakery Ltd | South Shields | 2022 |
| Asadsaid Ltd | Mildenhall | 2024 |
| Asaf HK Group Limited | Birmingham | 2023 |
| Asaga Noodle Bar Limited | Cwmbran | 2019 |
| Asahi Glassplant UK Ltd | Royston | 2019 |
| Asahi UK Ltd | London | 2019 |
| Asai Trade John Kath Ltd | Cardiff | 2025 |
| Asal-Karak Limited | London | 2025 |
| Asali Botanics Ltd | London | 2025 |
| Asam Heating and Plumbing Ltd | London | 2024 |
| Asan Enterprise UK Ltd | Twickenham | 2024 |
| Asante Clothing Limited | Croydon | 2014 |
| Asante Space Ltd | London | 2019 |
| Asap (UK) Limited | Southampton | 1997 |
| Asap Access Ltd | Carrickfergus | 2014 |
| Asap Architectural Ltd | Stevenage | 2025 |
| Asap Carpentry & Kitchens Limited | Exeter | 2009 |
| Asap Controls Limited | London | 2021 |
| Asap Digital Limited | Sheffield | 2005 |
| Asap Heights Limited | Rochdale | 2025 |
| Asap Innovations UK Limited | Birmingham | 2020 |
| Asap Mobile Battery Service Ltd | Nottingham | 2021 |
| Asap Services Ltd | London | 2026 |
| Asap Stevenage Ltd | Stevenage | 2017 |
| Asar Hippo Ltd | London | 2016 |
| Asase Tree Ltd | Essex | 2018 |
| ASB Blinds Limited | Iver | 1996 |
| ASB Lifts Ltd | Hornchurch | 2011 |
| ASB Services Electrical & Building Limited | Sutton | 2011 |
| ASB Software Development Limited | London | 2017 |
| ASB Technologies Ltd | Rayleigh | 2025 |
| ASB Trimming Ltd | Ruislip, | 2025 |
| Asbe Glovebag Limited | Ashwellthorpe, Norwich | 1989 |
| Asbestostrip Innovations UK Limited | Coleford | 2001 |
| Asbo Fabrications Ltd | Llanelli | 2021 |
| Asbo Ltd | Hove | 2024 |
| Asbs Joinery Ltd | London | 2023 |
| ASC Cartons Group Limited | Shipley | 2022 |
| ASC Cartons Limited | Shipley | 1981 |
| ASC Composites Ltd | London | 2026 |
| ASC Design and Procurement Limited | Lydney | 2018 |
| ASC Direct Limited | Shipley | 2007 |
| ASC Electrical Installations Ltd | Bromsgrove | 2016 |
| ASC Lift Engineering Services Limited | Stoke-On-Trent | 2021 |
| ASC LX Ltd | London | 2021 |
| ASC Seating & Interiors Limited | Blackburn | 2022 |
| ASC UK, Limited | Birmingham | 1995 |
| ASC Window Furnishings Limited | Abertillery | 2023 |
| ASC Woodworking Design Ltd | Wolverhampton | 2024 |
| Ascad Ltd | Watford | 2025 |
| Ascalon 1982 Limited | London | 2014 |
| Ascari Cars Limited | Longniddry | 1994 |
| Ascari Race Cars Ltd | Stamford | 2021 |
| Ascena Products Limited | Dronfield | 2015 |
| Ascencia Fire Consulting Limited | Hemel Hempstead | 2011 |
| Ascend Advanced Therapies Limited | London | 2021 |
| Ascend Diagnostics Limited | Manchester | 2016 |
| Ascend Elements UK, Ltd | London | 2022 |
| Ascend Energy Limited | London | 2025 |
| Ascend Escalators Ltd | Rochester | 2026 |
| Ascend Overseas Limited | London | 2013 |
| Ascend Performance Materials European Limited | Altrincham | 2018 |
| Ascend Studios CLO Ltd | Lee-On-The-Solent | 2025 |
| Ascend Water Limited | London | 2024 |
| Ascenda Global Foods Ltd | London | 2026 |
| Ascenda Lifts Ltd | Wellingborough | 2024 |
| Ascendant Information Management Limited | Bracknell | 2002 |
| Ascendant Lifts Limited | Gateshead | 2003 |
| Ascens Co Ltd | London | 2026 |
| Ascension Cider Co. Limited | Polegate | 2017 |
| Ascension Lift Solutions Limited | Northampton | 2022 |
| Ascension Signs North East Ltd | Sunderland | 2022 |
| Ascension Timepieces Ltd | London | 2026 |
| Ascent Bath & Body Ltd | Grimsby | 2021 |
| Ascent Design to Print Limited | Dartford | 2004 |
| Ascent Hookah Ltd | London | 2019 |