| Ascent Lift Services Limited | Portslade Brighton | 1995 |
| Ascent Lifts Limited | Sheffield | 2015 |
| Ascentia Foodservice Equipment Limited | Cambridge | 2015 |
| Ascetic Aesthete Ltd | London | 2007 |
| Ascherl Ceramics Limited | London | 1999 |
| Ascnd London Ltd | Hounslow | 2026 |
| Asco Components Limited | Birmingham | 2009 |
| Asco Fixings Limited | Harrow | 1998 |
| Ascose Investments Holding PLC | Ruislip | 2019 |
| Ascot Ales Limited | Ocean Way | 2007 |
| Ascot Autoclaves Ltd. | Wokingham | 1994 |
| Ascot Craft Studio Ltd | London | 2024 |
| Ascot Docking Solutions Limited | London | 2021 |
| Ascot Doors (Service) Limited | Barnsley | 2018 |
| Ascot Doors Ltd | Greater Manchester | 1981 |
| Ascot Event Hire Limited | Chipping Norton | 1999 |
| Ascot Fencing Limited | Allenton | 2020 |
| Ascot Finishers Limited | Slough | 2011 |
| Ascot Laboratories Limited | Borehamwood | 2011 |
| Ascot Pudsey Limited | Street Birmingham | 1952 |
| Ascot Technologies Limited | London | 2023 |
| Ascot Television and Video Limited | Berkshire | 2002 |
| Ascot Timber Buildings Limited | Guildford | 2002 |
| Ascot Top Hats Ltd | Crowthorne | 2006 |
| Ascotex Limited | Nelson | 1966 |
| Ascott Analytical Equipment Limited | Tamworth | 1991 |
| Ascott Fabrications Limited | Dewsbury | 2002 |
| Ascott Weighing Services Ltd | Derbyshire | 2003 |
| ASD Lighting PLC | Rotherham | 1982 |
| ASD Luxe Diamonds Ltd | London | 2025 |
| ASD Manchester Ltd | Manchester | 2012 |
| ASD Welding Services Limited | Glenrothes | 2011 |
| ASD Westok Limited | Leeds | 2002 |
| Asdam UK Holdings Limited | Keighley | 2025 |
| Asdullah Limited | Bury | 2023 |
| ASE Security & Electrical Ltd | Ilford | 2024 |
| ASE TEK Ltd | London | 2023 |
| Ase&Building Ltd | Coventry | 2013 |
| Asea Engineering & Consultancy Ltd | Glasgow | 2021 |
| Asecong Limited | Cardiff | 2023 |
| Aseda Shea Ltd | Dartford | 2025 |
| Aseel Foods Ltd | Blackburn | 2024 |
| Aseer Time Ltd | Birmingham | 2025 |
| Asees Punjabi Sweets Ltd | Leicester | 2024 |
| Asees Traders Ltd | Camberley | 2023 |
| Asege Labs Ltd | London | 2025 |
| Aseiro Industries Ltd | Sheffield | 2025 |
| Asem Noor Limited | Preston | 2024 |
| Asembl Limited | Gerrards Cross | 2021 |
| Asen Stanoev Ltd | Enfield | 2026 |
| Asep Healthcare Limited | Liverpool | 2008 |
| Asep Services Limited | Bedford | 2019 |
| Aseptic Connectors Limited | Tring | 2018 |
| Aseptic Limited | High Wycombe | 2020 |
| Aseptic Supplies & Maintenance Limited | Nottingham | 1999 |
| Aseptuva Ltd | Cambridge | 2022 |
| ASF Conveyor Services Limited | Ryton | 2014 |
| ASF Creative Ltd | Swindon | 2025 |
| ASF Locksmiths Limited | Weston-Super-Mare | 2013 |
| ASF Signs Limited | Swindon | 2001 |
| ASF Sofa Frames Limited | Blackburn | 2015 |
| Asf.Aero Ltd | Mildenhall | 2025 |
| Asfaar Fragrance Limited | London | 2014 |
| Asfordby Doors Limited | East Goscote | 2002 |
| Asft Ltd | London | 2026 |
| ASG (Accessories) Limited | | 1999 |
| ASG Aerospace Limited | Manchester | 2019 |
| ASG Energy Ltd | Barnsley | 2004 |
| ASG Food Services UK Ltd | Ilford | 2026 |
| ASG Group Limited | Derbyshire | 1969 |
| ASG International Trading Ltd | London | 2019 |
| ASG Tooling Limited | Manchester | 2019 |
| Asgard Construction Ltd | London | 2025 |
| Asgard Engineering Limited | Hyde | 2000 |
| Asgard Yachts Limited | St. Austell | 2012 |
| Asgb JIM Ltd | Wanstead | 2022 |
| Asgs (UK) Ltd | Wimborne | 2011 |
| Asguk (Systems) Limited | Gloucester | 2002 |
| ASH & Ember Charcoal Ltd | Walsall | 2025 |
| ASH & Ivory Ltd | London | 2025 |
| ASH & Lacy Automotive Limited | Smethwick | 1954 |
| ASH & Lacy Building Systems Limited | Smethwick | 1917 |
| ASH & Lacy Finishes Limited | Smethwick | 2017 |
| ASH & Lacy Perforating Limited | Smethwick | 2017 |
| ASH & Lacy Pressings Limited | Smethwick | 2012 |
| ASH & Lacy Profiles Limited | Smethwick | 2013 |
| ASH & Lacy Solutions Limited | Smethwick | 2017 |
| ASH & Maple Limited | High Wycombe | 2015 |
| ASH & Vine Ltd | Dumfries | 2022 |
| ASH (U.K.) Limited | Glasgow | 1989 |
| ASH 59 Ltd | Leicester | 2017 |
| ASH Agri Engineering Ltd | St Ives | 2023 |
| ASH and ELM Woodworks Ltd | Scunthorpe | 2026 |
| ASH by SAM Ltd | Bradford | 2025 |
| ASH Carpentry Build Ltd | Newquay | 2025 |
| ASH Cremation Keepsake Ltd | Lisburn | 2025 |
| ASH Design & Construction Limited | London Colney | 2009 |
| ASH Door Furniture & Entrance Specialists Ltd | Nottingham | 1994 |
| ASH Door Furniture Holdings Limited | Nottingham | 2022 |
| ASH Electronics & Security Ltd | Maidstone | 2022 |