| Advanceris Ltd | London | 2024 |
| Advancery Limited | Bingley | 2014 |
| Advances Services Limited | Bexleyheath | 2024 |
| Advances.In Ltd | London | 2022 |
| Advancetech Consulting Ltd | Beckenham | 1999 |
| Advancevision Ltd | London | 2020 |
| Advanceworx Creative Communications Limited | Hamilton | 2015 |
| Advancia Limited | Berkshire | 2023 |
| Advancing Agile Limited | London | 2015 |
| Advancing Analytics Limited | London | 2018 |
| Advancing Labs Limited | London | 2023 |
| Advancing Managed Services Limited | London | 2023 |
| Advancing Optics Ltd | Kingswinford | 2023 |
| Advancing Software Solutions Limited | London | 2018 |
| Advancium I.T. Ltd | Milton Keynes | 2014 |
| Advanco Software Limited | London | 2020 |
| Advancor Solutions Limited | London | 2020 |
| Advani Ltd | London | 2021 |
| Advania Dormant Limited | Manchester | 2001 |
| Advania UK (CCS) Limited | Manchester | 2002 |
| Advania UK (Servium) Limited | Manchester | 2009 |
| Advania UK Limited | Manchester | 1998 |
| Advania UK SMB Limited | Manchester | 2002 |
| Advansec Ltd | Cleckheaton | 2024 |
| Advanstar Communications (U.K.) Limited | Manchester | 1996 |
| Advansys Limited | Wokingham | 2000 |
| Advansys Solutions Ltd | Yeovil | 2003 |
| Advansys Technologies Limited | Park Royal | 2007 |
| Advant Consultancy Ltd | Manchester | 2014 |
| Advant International Limited | Redhill | 2007 |
| Advanta Intelligence Limited | London | 2025 |
| Advanta Internet Limited | Newbury | 1997 |
| Advanta Productions Limited | Nottingham | 2004 |
| Advantage ADS Ltd | Bolton | 2025 |
| Advantage AI Consulting Limited | London | 2023 |
| Advantage AI Limited | Tring | 2024 |
| Advantage Business Contracts Ltd | Hainault | 2008 |
| Advantage Business Systems Limited | London | 1983 |
| Advantage Claims Solutions Corporation Ltd | Leicester | 2021 |
| Advantage Computers Limited | Huddersfield | 2004 |
| Advantage CX Limited | Thame | 2023 |
| Advantage Films Limited | London | 2017 |
| Advantage Global Ltd | Milton Keynes | 2025 |
| Advantage Hub Ltd | Nottingham | 2010 |
| Advantage I.T. Development Consultants Ltd | Bromborough | 2012 |
| Advantage Intelligence Limited | Blackburn | 2026 |
| Advantage IT Consulting Ltd | Kidlington | 2016 |
| Advantage Learning Limited | Edinburgh | 2003 |
| Advantage Media Limited | Cambridge | 1989 |
| Advantage Media Network Ltd | Horsham | 2008 |
| Advantage Media Solutions Ltd | Chesham | 2012 |
| Advantage Media UK Limited | Aylesford | 2005 |
| Advantage Networks (UK) Ltd | Stroud | 2009 |
| Advantage Publishing (UK) Ltd | Horsham | 2006 |
| Advantage Publishing Limited | Reigate | 2004 |
| Advantage Software Limited | Bristol | 2013 |
| Advantage Test Consulting Limited | Fairford | 2023 |
| Advantageagi Ltd | Truro | 2023 |
| Advantagenfp Limited | St Albans | 2000 |
| Advantagit Solutions Limited | West Drayton | 2014 |
| Advantaiso Limited | Billericay | 2023 |
| Advantec Consulting Limited | Worthing | 2003 |
| Advantec Internet Services Limited | Gloucester | 2008 |
| Advantec Systems Limited | Solihull | 1979 |
| Advantedge IT Solutions Ltd | Farnborough | 2016 |
| Advantellect Ltd | London | 2025 |
| Advantex Network Solutions Limited | Gateshead | 2002 |
| Advantex Solutions Limited | Durham | 2024 |
| Advantica Limited | London | 2021 |
| Advantiers Limited | Dartford | 2011 |
| Advantis Ltd | Pontefract | 2004 |
| Advantis Solutions Ltd | London | 2025 |
| Advantisec Ltd | Ely | 2023 |
| Advantium Consulting Limited | Grays | 2022 |
| Advantix Technologies Limited | London | 2014 |
| Advantra Ltd | Dagenham | 2025 |
| Advantraq Business Services Limited | Welwyn Garden City | 2011 |
| Advantric Limited | Tottenham, London | 2018 |
| Advantum Solutions Ltd | London | 2011 |
| Advantys Consulting Ltd | Dartford | 2025 |
| Advanza Limited | London | 2026 |
| Advapay UK Ltd | London | 2026 |
| Advargo Limited | London | 2020 |
| Advastack Ltd | Moreton-In-Marsh | 2023 |
| Advaya IT Consultants Ltd | St. Albans | 2023 |
| Advbeca Ltd | London | 2015 |
| ADVC8 Limited | Wigan | 2018 |
| Advcy Ltd | Teddington | 2025 |
| Advecto Media Limited | Liverpool | 2016 |
| Advector Limited | Redhill | 2012 |
| Adved Solutions Limited | Bracknell | 2024 |
| Adveed Ltd. | Brentford | 2017 |
| Advelocity Limited | Hindhead | 1994 |
| Adven Boost Ltd | London | 2023 |
| Advencha Ltd | Witney | 2025 |
| Advensys Conseil Ltd | London | 2010 |
| Advensys Limited | Derby | 1997 |
| Advent Books Limited | Leicestershire | 2003 |
| Advent Calendar Online Limited | Middlesbrough | 2015 |
| Advent Communications P.R. Limited | London | 2002 |