| Advanced Spectrum Limited | Maidstone | 2008 |
| Advanced Sterile Engineering Ltd | Huntingdon | 2018 |
| Advanced Strategies Ltd | London | 1998 |
| Advanced Studwelding Systems Limited | Wigan | 2002 |
| Advanced Supplies Limited | Standish | 2003 |
| Advanced Supply Chain Analytics Ltd | Market Harborough | 2024 |
| Advanced Switching Solutions Limited | Wellingborough | 2016 |
| Advanced System Assurance Ltd | London | 2022 |
| Advanced Systems Corporation International Limited | | 1989 |
| Advanced Systems Installations Limited | Wiltshire | 1988 |
| Advanced Systems Understanding Ltd | Southampton | 2012 |
| Advanced T Accountancy Ltd | London | 2019 |
| Advanced Tactical Resources Limited | Reading | 2012 |
| Advanced Talent Strategies Limited | Downham Market | 2022 |
| Advanced Tax Solutions Ltd | Leicester | 2018 |
| Advanced Tech Business Limited | Cardiff | 2024 |
| Advanced Technical Limited | Bletchley | 1988 |
| Advanced Technical Welding Limited | Lichfield | 2002 |
| Advanced Technologies Investments Limited | Burnham | 1984 |
| Advanced Technology Trading Company Ltd | Basingstoke | 2016 |
| Advanced Templating Services Limited | Belmont | 2015 |
| Advanced Test Ltd | Watford | 2012 |
| Advanced Testing Services Ltd | Dronfield | 2026 |
| Advanced Therapies Consulting Limited | Ilkley | 2020 |
| Advanced Thinking Ltd | Ilford | 2024 |
| Advanced Tooling Systems (Holdings) Ltd | Maidstone | 2012 |
| Advanced Trades Ltd | Rochester | 2018 |
| Advanced Traffic Ltd | Bury | 2020 |
| Advanced Transport Energy Solutions Limited | Alfreton | 2023 |
| Advanced Transport Research Limited | London | 2010 |
| Advanced Travel Partners International Limited | Manchester | 2002 |
| Advanced Ultrasonic NDT Ltd | Lossiemouth | 2019 |
| Advanced Ultrasonic Solutions Ltd | Renfrew | 2014 |
| Advanced Vacuum & Lift Limited | Bangor | 2025 |
| Advanced Vehicle Works Ltd | Halstead | 2024 |
| Advanced Vehicle Wraps Ltd | Dunfermline | 2012 |
| Advanced Ventilation Services Limited | London | 2023 |
| Advanced Veterinary Dermatology Ltd | Kenilworth | 2025 |
| Advanced Veterinary Services Limited | Eastwood | 2018 |
| Advanced Veterinary Solutions Limited | Taunton | 2022 |
| Advanced Virtual Appointers Ltd | Lincoln | 2022 |
| Advanced Vision Technology Limited | Northampton | 1998 |
| Advanced Visual Optics Ltd | West Cliff On Sea | 2012 |
| Advanced Water Testing Ltd | London | 2023 |
| Advanced Water Treatment (UK) Ltd | King'S Lynn | 2005 |
| Advanced Wave Technologies Ltd | Lincoln | 2019 |
| Advanced Way Accounting Limited | London | 2020 |
| Advanced Web Services Limited | Wetherby | 2007 |
| Advanced Wireless Technology Limited | Portsmouth | 2010 |
| Advanced Workplace Associates Limited | Cheshunt | 1992 |
| Advancedplan Limited | Cheltenham | 1994 |
| Advancedtec Ltd | Kington | 2010 |
| Advancegbs Limited | Crawley | 2021 |
| Advanceium | Wigan | 2026 |
| Advancelink Solutions Ltd | London | 2026 |
| Advancement Design Limited | Ashton-Under-Lyne | 2019 |
| Advancement Limited | Wolverhampton | 2015 |
| Advancement Online Limited | Solihull | 2022 |
| Advancement Quest Limited | Cambridge | 2025 |
| Advancemoat Limited | Stockport | 2026 |
| Advancepsychotherapy Ltd. | Sheffield | 2016 |
| Advancete Limited | Sevenoaks | 2016 |
| Advancetwentyone Limited | Harrow | 2012 |
| Advancia Consulting Group Ltd | York | 2026 |
| Advancing 3D Design Ltd | Kingston Upon Thames | 2021 |
| Advancing Care Ltd. | Newport | 2012 |
| Advancing Energy Ltd | Cramlington | 2022 |
| Advancing Growth Ltd | Farnborough | 2024 |
| Advancing Sustainability Ltd | Colchester | 2013 |
| Advancing Sustainable Infrastructure Limited | Fenny Compton | 2022 |
| Advancor Energy Assessments Ltd | London | 2024 |
| Advancy Limited | London | 2017 |
| Advand Ltd | Cambridge | 2015 |
| Advanevo Limited | Peterborough | 2019 |
| Advani International Limited | North Harrow | 2008 |
| Advania Holdings UK Limited | Manchester | 2016 |
| Advaniti Associates Limited | Stonehouse | 2024 |
| Advaniti Limited | Stonehouse | 2007 |
| Advans Media Ltd | Wednesbury | 2026 |
| Advansci Limited | Stockport | 2011 |
| Advanse Limited | Weybridge | 2024 |
| Advanshield Limited | Solihull | 2015 |
| Advansys Engineering Services & Consultancy Limited | London | 2014 |
| Advansys Group Limited | Wokingham | 2013 |
| Advansys Technology Ltd | London | 2023 |
| Advant Consulting Group Limited | Scunthorpe | 2021 |
| Advant Technology Limited | High Wycombe | 2014 |
| Advant-Edge Consulting Limited | Birmingham | 2021 |
| Advanta Advertising Ltd | Bagshot | 2026 |
| Advanta Advisory Group Ltd | London | 2025 |
| Advanta Business Services Limited | East Sussex | 2005 |
| Advanta Consulting Limited | West Midlands | 2001 |
| Advanta Corporate Services Limited | East Sussex | 2006 |
| Advanta Digital Limited | Witney | 2026 |
| Advanta Hub Ltd | Abertawe | 2026 |
| Advanta Limited | Winchester | 2026 |
| Advantads Ltd | London | 2024 |
| Advantage Accountancy & Advisory Ltd | Cardiff | 2017 |
| Advantage Accountancy Tax & Outsourcing Ltd | Cheadle Hulme | 2010 |
| Advantage Accounting (Scotland) Limited | Glasgow | 2009 |