| Advanced Adhesives Ltd. | Newcastle Upon Tyne | 1996 |
| Advanced Advertising Limited | Pinner | 2019 |
| Advanced Aerial Imagery Limited | Great Barrow | 2009 |
| Advanced Aerial Media Ltd | Prestwick | 2015 |
| Advanced African Associates Ltd | Milton Keynes | 2023 |
| Advanced Alba Assessing Limited | Glasgow | 2017 |
| Advanced Alternative Media Limited | London | 2007 |
| Advanced Aluminium (UK) Limited | Poulton-Le-Fylde | 2007 |
| Advanced Aluminium Limited | Poulton-Le-Fylde | 2007 |
| Advanced AMZ Consulting Ltd | London | 2025 |
| Advanced Anaesthesia Specialists UK Limited | London | 2007 |
| Advanced Analysis Limited | Steyning | 1997 |
| Advanced Animation Academy Ltd | Fareham | 2021 |
| Advanced Architecture and Structures Limited | Birmingham | 2017 |
| Advanced Artist Training Ltd | York | 2025 |
| Advanced Assessments Ltd | Nottinghamshire | 1999 |
| Advanced Asset Consultants Limited | Glasgow | 2009 |
| Advanced Asset Hub Ltd | London | 2015 |
| Advanced Audio and Vision Limited | Berkshire | 2001 |
| Advanced Autoclave Technologies Ltd | Hutningdon | 2017 |
| Advanced Automation Limited | Chapel-En-Le-Frith | 2018 |
| Advanced Automation Technologies Ltd | London | 2020 |
| Advanced Automobile Solutions Ltd | Northwich | 2021 |
| Advanced Autoz Ltd | Mildenhall | 2022 |
| Advanced Aviation Technology Limited | Guildford | 1997 |
| Advanced B-Solv Technology Limited | Didcot | 2025 |
| Advanced Barrier Coatings Limited | Blyth | 2015 |
| Advanced Battery Management Systems UK Limited | Winchester | 2018 |
| Advanced Bio-Extracts Limited | Newcastle | 2000 |
| Advanced Biofuels Limited | Peterborough | 2017 |
| Advanced Biointelligence Ltd | Winchester | 2025 |
| Advanced Biologics Consulting (ABC) Ltd | Market Drayton | 2023 |
| Advanced Biologics Research Ltd | Eastleigh | 2023 |
| Advanced Bioprocess Development Limited | Cheadle Royal | 2002 |
| Advanced Bioprocess Services Limited | Loughborough | 2016 |
| Advanced Biosystems Ltd | Wantage | 2022 |
| Advanced Biotech Ltd | Sheffield | 2025 |
| Advanced Biotherapies Limited | Cardiff | 2010 |
| Advanced Bird Solutions Limited | Ashford | 2016 |
| Advanced Blast & Ballistic Systems Limited | Oswestry | 2009 |
| Advanced Boardroom Excellence Limited | Wallington | 2013 |
| Advanced Bookkeeping and Consultancy Limited | Hailsham | 2024 |
| Advanced Bookkeeping Services NI Ltd | Newry | 2025 |
| Advanced British Instruments Ltd | Warminster | 2016 |
| Advanced Building & Maintenance Services Employees' Trustee Limited | London | 2025 |
| Advanced Building Consultants Limited | Armagh | 2019 |
| Advanced Building Management Limited | London | 2008 |
| Advanced Business Capital Limited | Leighton Buzzard | 1998 |
| Advanced Business Concepts Ltd | Banbury | 2002 |
| Advanced Business Machines (Humberside) Limited | Davyhulme | 1989 |
| Advanced Business Software and Solutions Limited | Birmingham | 2001 |
| Advanced Business Strategies Limited | Lytham St. Annes | 2006 |
| Advanced Capability Solutions Limited | Tunbridge Wells | 2012 |
| Advanced Carbons Council Limited | Manchester | 2020 |
| Advanced Care Rentals Limited | Worthing | 1990 |
| Advanced Cctv Technologies Limited | Weybridge | 2007 |
| Advanced Cell Technologies Ltd | Barnet | 2018 |
| Advanced Certification Limited | West Malling | 2014 |
| Advanced Chemical Intermediates Limited | Cornwall | 2006 |
| Advanced Client Ltd | Mildenhall | 2024 |
| Advanced Climate Technology Limited | Littlehampton | 1995 |
| Advanced Clinical Research Services Limited | Guildford | 2018 |
| Advanced Clinical Solutions Ltd | Newport | 2016 |
| Advanced Cloud Technology Ltd | London | 2020 |
| Advanced CNC Solutions Ltd | Cambridge | 2025 |
| Advanced Combat Training Systems Ltd. | Hounslow | 2019 |
| Advanced Communication Systems Limited | Solihull | 1990 |
| Advanced Compliance Solutions Ltd | Bolton | 2017 |
| Advanced Concept Limited | London | 2022 |
| Advanced Concepts Engineering Ltd | Shirley | 2025 |
| Advanced Consulting Network Limited | Hove | 2013 |
| Advanced Consulting Service Limited | Mansfield Woodhouse | 2004 |
| Advanced Control Technology Limited | Manchester | 2021 |
| Advanced Cooling for Data Centers Ltd | Bracknell | 2025 |
| Advanced Cosmetic Procedures ( London ) Ltd | London | 2022 |
| Advanced Cosmetic Procedures by Debbie Ltd | London | 2022 |
| Advanced Cryogenic Materials Limited | Wantage | 2009 |
| Advanced Crystal Technology Limited | Guildford | 1985 |
| Advanced Design & Detailers Ltd | Wilmslow | 2024 |
| Advanced Design & Development Limited | Warwick | 1992 |
| Advanced Design Engineering Limited | | 1994 |
| Advanced Design Services Limited | Batley | 2020 |
| Advanced Design Technologies Ltd. | Warks | 1988 |
| Advanced Designs Ltd | Nottingham | 2026 |
| Advanced Designs Sheetmetal Fabrications Ltd | Nottingham | 2014 |
| Advanced Details Ltd | Bradford-On-Avon | 2014 |
| Advanced Development & Safety Laboratories Limited | Torquay | 2008 |
| Advanced Development and Financial Company Limited | Watford | 2009 |
| Advanced Development Engineering Limited | Beckermet | 2007 |
| Advanced Development Solutions Ltd | Silsoe | 2021 |
| Advanced Diagnostics Limited | Nuneaton | 2002 |
| Advanced Digital Media Solutions Limited | Maidstone | 2012 |
| Advanced Digital Research (UK) Ltd | Grantham | 2017 |
| Advanced Digital Technology (U.K.) Limited | Solihull | 1983 |
| Advanced Dispense Solutions Ltd | West Horndon | 2025 |
| Advanced Document Solutions Limited | Reading | 1998 |
| Advanced Economic Development Ltd | Sheffield | 2012 |
| Advanced Effects Limited | Camberley | 2017 |
| Advanced Electric Machines Limited | Washington | 2016 |
| Advanced Electric Machines Research Limited | Washington | 2016 |