| Advanced Business Software UK Ltd | Worcester | 2022 |
| Advanced Business Solution House Limited | Uxbridge | 2002 |
| Advanced CAD Technology Limited | Coventry | 2006 |
| Advanced Capability (UK) Limited | Tunbridge Wells | 2013 |
| Advanced Case Management Solutions Limited | Glasgow | 2011 |
| Advanced Cellular Engineering Ltd | Glossop | 2021 |
| Advanced Chemistry Development UK Ltd | London | 2006 |
| Advanced Cloud Tech Limited | Essex | 2012 |
| Advanced Cloud Technologies Ltd | London | 2024 |
| Advanced Collection Systems Limited | Hatfield | 2000 |
| Advanced Commerce Ltd | London | 2018 |
| Advanced Communications (Northern) Ltd | Wallasey | 2014 |
| Advanced Communications Southern Limited | Birkenhead | 2019 |
| Advanced Communities Ltd | London | 2008 |
| Advanced Company Software Ltd | Macclesfield | 2009 |
| Advanced Compliance Technology, Ltd | Peacehaven | 2024 |
| Advanced Computer Services (London) Limited | Woodford Green | 2003 |
| Advanced Computer Software Solutions Ltd | Cardiff | 2025 |
| Advanced Computer Solutions Limited | Bedford | 1996 |
| Advanced Computer Systems Property Holdings Limited | Brigg | 2018 |
| Advanced Computer Technology Systems Limited | Reading | 2003 |
| Advanced Connection Group Limited | London | 2023 |
| Advanced Control and Communication Solutions Ltd | London | 2026 |
| Advanced Control Limited | Wirral | 2019 |
| Advanced Control Partnerships Limited | Wirral | 2013 |
| Advanced Control Systems Engineering Ltd | Bristol | 2019 |
| Advanced Control Systems Limited | Whitley Bay | 1985 |
| Advanced Creations Ltd | Manchester | 2025 |
| Advanced CSV Ltd | Hull | 2024 |
| Advanced Cyber Defence Systems Limited | London | 2021 |
| Advanced Cybercrafts Ltd | Milton Keynes | 2022 |
| Advanced Data Design Limited | Lincoln | 2003 |
| Advanced Data Services Ltd | Bolton | 2023 |
| Advanced Data Solutions UK Limited | Lytham St. Annes | 1998 |
| Advanced Data Spectrum Limited | Chesham | 1998 |
| Advanced Data Storage Solutions Limited | London | 2009 |
| Advanced Data Systems Limited | Nuneaton | 2003 |
| Advanced Data Technologies Limited | Whiteley | 2007 |
| Advanced Datacentre Systems Ltd | Cranleigh | 2004 |
| Advanced Decision Modelling Ltd | Bolton | 2017 |
| Advanced Defence Solutions Ltd | Pathhead | 2023 |
| Advanced Defence Technologies Ltd | Manchester | 2024 |
| Advanced Design Technology Limited | London | 1998 |
| Advanced Digital Associates Ltd | Bourne | 2025 |
| Advanced Digital Consulting and Transformation Ltd | Wokingham | 2011 |
| Advanced Digital Creations Ltd | London | 2025 |
| Advanced Digital Engineering Ltd | Cardiff | 2022 |
| Advanced Digital Media (Barrow) Ltd | Morecambe | 2022 |
| Advanced Digital Media Limited | Morecambe | 2015 |
| Advanced Digital Ressources Ltd | London | 2022 |
| Advanced Digital Services Limited | Wolverhampton | 2025 |
| Advanced Digital Transformation Ltd | Newcastle Upon Tyne | 1980 |
| Advanced Disclosures Ltd | Wallasey | 2018 |
| Advanced Downloading Limited | London | 1992 |
| Advanced Education Ltd | Pinner | 2017 |
| Advanced Electrical Systems London Ltd | London | 2025 |
| Advanced Engine Research Limited | Rochford | 1998 |
| Advanced Expert Systems Limited | Derby | 1989 |
| Advanced Factory Solutions Limited | London | 2023 |
| Advanced Field Applications Ltd | Solihull | 2006 |
| Advanced Financial Analytics Ltd | London | 2022 |
| Advanced Financial Tech Ltd | London | 2025 |
| Advanced Financial Trading Technologies Ltd | Northampton | 2020 |
| Advanced Fractions Ltd | Maidstone | 2024 |
| Advanced Global Polling Technology Ltd | London | 2025 |
| Advanced Group TH Ltd | Glasgow | 2026 |
| Advanced GS Ltd | Lymington | 2018 |
| Advanced Health and Care Limited | Birmingham | 1994 |
| Advanced Healthcare Computing Limited | Gillingham | 1990 |
| Advanced Heating Systems Ltd | Chorley | 1994 |
| Advanced Hodl Technologies Ltd. | Pershore | 2017 |
| Advanced Hub Solutions Ltd | Greenford | 2026 |
| Advanced I.T (UK) Limited | Ilkeston | 2012 |
| Advanced In-Car Technologies Limited | Poole | 2005 |
| Advanced Info Systems Limited | Birmingham | 2019 |
| Advanced Informatics Ltd | Nottingham | 2018 |
| Advanced Information Access (London) Limited | Hoddesdon | 2018 |
| Advanced Information Management Solutions Limited | Surrey | 1996 |
| Advanced Infrastructure Limited | Weybridge | 2013 |
| Advanced Infrastructure Solutions Ltd | Wickford | 2015 |
| Advanced Inkjet Services Limited | Fen Drayton | 2008 |
| Advanced Innovation Insights Ltd | Wirral | 2019 |
| Advanced Innovation Solutions Ltd | Glasgow | 2021 |
| Advanced Innovations Ltd | Hayes | 2022 |
| Advanced Insights Ltd | Cambridge | 2022 |
| Advanced Integrated Solutions (UK) Limited | Bicester | 2013 |
| Advanced Intelligence Solutions Ltd | Berkeley | 2026 |
| Advanced Intelligent Machines Limited | Chiswick | 2010 |
| Advanced Intelligent Technologies Limited | Rotherham | 2025 |
| Advanced Internet Solutions Ltd. | Bolton | 2000 |
| Advanced Internet Technologies Limited | Bakewell | 2005 |
| Advanced Investments Limited | Peterborough | 1997 |
| Advanced IP Limited | Birmingham | 2012 |
| Advanced IP Solutions Limited | Maidenhead | 2016 |
| Advanced IT Services Nottingham Ltd | Nottingham | 2000 |
| Advanced IT Systems Ltd | Handworth Wood | 2014 |
| Advanced Labs Ltd | London | 2026 |
| Advanced Leadership Mentoring Academy Ltd. | London | 2016 |
| Advanced Legal Solutions Limited | London | 1983 |
| Advanced Link Strategies Ltd | Cardiff | 2025 |