| ASM Interiors Limited | Dagenham | 2025 |
| ASM Product Holdings Limited | Wakefield | 2019 |
| ASM Truck Diagnostics Limited | Basildon | 2012 |
| ASM Tuning UK Ltd | Birmingham | 2023 |
| Asm.Manufacturer Ltd | Ilford | 2025 |
| Asmaan TV Ltd | Greenford | 2021 |
| Asmai UK Limited | West Midlands, England | 2025 |
| Asmara Botanicals Ltd | London | 2021 |
| Asmarina Fashion Limited | Dartford | 2021 |
| Asme Fabrications Limited | Beesborough | 2003 |
| Asmech Systems Limited | Mansfield | 1998 |
| Asmpt SMT UK Limited | Weymouth | 1967 |
| ASN Fabrications Ltd | Manchester | 2023 |
| ASN Powder Coatings Ltd | London | 2026 |
| ASN Production & Logistics Ltd | Batley | 2023 |
| ASN Trading Limited | Potters Bar | 2015 |
| Asnew Upholstery Services Limited | Abingdon | 2002 |
| Asnezz Ltd | Birmingham | 2024 |
| Asns Apparel Limited | London, | 2025 |
| Asnu Corporation Europe Limited | Hertfordshire | 1997 |
| Asoi Sharazoor Ltd | Leicester | 2026 |
| Asoom Ltd | Kington | 2023 |
| Asor London Ltd | London | 2025 |
| Asoro Inc Ltd. | London | 2023 |
| Asos Auto Parts Ltd | Birmingham | 2022 |
| Asovia Ltd | Bristol | 2026 |
| ASP Furniture Design Limited | Derby | 2019 |
| ASP Glazing Limited | Lincoln | 2001 |
| Aspa Labs Ltd | Manchester | 2026 |
| Aspa Trading Ltd | Nottingham | 2021 |
| Aspar Pharmaceuticals Limited | St. Albans | 1991 |
| Aspcold Manufacturing Limited | Leeds | 2024 |
| Aspec Precision Engineering Limited | Croydon | 2001 |
| Aspect (Hull) Ltd | Ryehill | 2020 |
| Aspect Air Ltd | Benfleet | 2014 |
| Aspect Assembly Limited | Stockport | 1993 |
| Aspect Bespoke Engineering Limited | Croydon | 2009 |
| Aspect Blinds Ltd | Bury St. Edmunds | 2014 |
| Aspect Carpentry Ltd | Trowbridge | 2017 |
| Aspect Coffee Ltd | Croydon | 2025 |
| Aspect Composites Ltd | Colchester | 2026 |
| Aspect Cranleigh Limited | Guildford | 2013 |
| Aspect Developments (SY) Ltd | Sheffield | 2019 |
| Aspect Digital Limited | Thornbury | 2009 |
| Aspect Doors and Windows Ltd | Ilkeston | 2018 |
| Aspect Edinburgh Ltd | Edinburgh | 2012 |
| Aspect Electrical & GAS Services Ltd | Plymouth | 2005 |
| Aspect Electrical Services (NW) Ltd | Heswall | 2021 |
| Aspect Energy Management Limited | Sheffield | 2008 |
| Aspect Engineering Consultants Limited | Wrexham | 1995 |
| Aspect Engineering London Limited | Woking | 2017 |
| Aspect Esports Ltd | Llandudno | 2025 |
| Aspect GAS Care Limited | Alloa | 2011 |
| Aspect Glass Limited | Ipswich | 2019 |
| Aspect Installation & Engineering Services Limited | Guildford | 2002 |
| Aspect Metalcraft Ltd | Eastbourne | 2002 |
| Aspect Performance Limited | Cleckheaton | 2023 |
| Aspect Powder Coatings Limited | Tipton | 1993 |
| Aspect Scientific Ltd | Tarporley | 2014 |
| Aspect Services Group Ltd | Deeside | 2020 |
| Aspect Solar Maintenance Limited | Plymouth | 2016 |
| Aspect Woodworking Limited | Faringdon | 2005 |
| Aspects Bespoke Carpentry & Joinery Ltd | Ashford | 2024 |
| Aspects Engineering (Control & Automation) Limited | Loughborough | 2020 |
| Aspects of Glass Limited | Merseyside | 2003 |
| Aspects of Glass Toughened Ltd | St. Helens | 2021 |
| Aspects of Snowdonia Limited | Porthmadog | 2012 |
| Aspell's Carpentry & Joinery Ltd | Reading | 2021 |
| Aspen & ASH Limited | Eastleigh | 2014 |
| Aspen Animal Health Ltd | Hemel Hempstead | 2016 |
| Aspen Concepts Limited | Swindon | 2006 |
| Aspen Joinery & Design Ltd | Billericay | 2021 |
| Aspen Joinery Ltd | Weston-Super-Mare | 2005 |
| Aspen Lodges Ltd | Rotherham | 2018 |
| Aspen Manufacturing Limited | Swindon | 2015 |
| Aspen Pumps Limited | Hailsham | 2012 |
| Aspen Retail Interiors Limited | Swindon | 2003 |
| Aspen Services Limited | Bristol | 1986 |
| Aspen Snow Cosmetics Ltd | London | 2021 |
| Aspen Technologies Limited | North Road Loughborough | 1999 |
| Asper London Ltd | London | 2025 |
| Asper Systems Limited | Kelso | 2004 |
| Aspeya UK Limited | London | 2024 |
| Aspg Limited | Chelmsford | 2012 |
| Asphalia Food Products Limited | Pontypool | 2007 |
| Asphalt-Iq Limited | Hull | 2020 |
| Aspico Ltd | Ashford | 2018 |
| Aspin Engineering Limited | Manchester | 1984 |
| Aspinal Limited | Birmingham | 2024 |
| Aspinall and Co Bespoke Cabinetry Limited | Manchester | 2025 |
| Aspinall Bespoke Ltd | Manchester | 2021 |
| Aspinall Entertainments Ltd | York | 2024 |
| Aspinall Office Installations Ltd | Wolverhampton | 2015 |
| Aspins Bakery Limited | South Shields | 2008 |
| Aspirare Solutions Limited | Romford | 2015 |
| Aspire Academy Glasgow Limited | Glasgow | 2022 |
| Aspire Aerospace Ltd | Portsmouth | 2018 |
| Aspire Aluminium Ltd | Tamworth | 2019 |
| Aspire Auto Design Ltd | Manningtree | 2024 |
| Aspire Caravans Ltd | Wishaw | 2023 |