| Advanced M&E Solutions Limited | Cardiff | 2017 |
| Advanced Management Information Systems Ltd | Stockton On Tees | 2015 |
| Advanced Management Systems Limited | Woking | 1993 |
| Advanced Manufacturing Control Systems UK Limited | Nuneaton | 2006 |
| Advanced Marketing Services Ltd | Bridgnorth | 2022 |
| Advanced Marketing Chapter & Verse Ltd. | Glasgow | 2004 |
| Advanced Marketing Group Ltd | Brentford | 2023 |
| Advanced Marketing Intelligence Ltd | Haywards Heath | 2024 |
| Advanced Marketing Solutions Limited | Preston | 2023 |
| Advanced Media Development Ltd | London | 2026 |
| Advanced Media Engineering Limited | Exeter | 2000 |
| Advanced Media Innovation Systems Limited | Hounslow | 2008 |
| Advanced Media Restoration Limited | Stalybridge | 2011 |
| Advanced Media Solutions Limited | Manchester | 2019 |
| Advanced Medical AI Systems Ltd | London | 2010 |
| Advanced Meeting Solutions (International) Limited | Stockport | 1999 |
| Advanced Micro Systems Limited | Worksop | 1995 |
| Advanced Mindset Ltd | London | 2023 |
| Advanced Nationwide Auctions Limited | Birmingham | 2017 |
| Advanced Nationwide Limited | Birmingham | 2021 |
| Advanced Netops Services Ltd | London | 2023 |
| Advanced Network Security Limited | Farnborough | 2003 |
| Advanced New Media Group Ltd | Amersham | 2026 |
| Advanced New Technology Limited | Crowborough | 1986 |
| Advanced NFT Solutions Group Limited | Nottingham | 2022 |
| Advanced Nonlinear Technologies Ltd | London | 2019 |
| Advanced Online Solutions Ltd | Liverpool | 2023 |
| Advanced Paradigms Ltd | London | 2019 |
| Advanced Parking Tech Ltd | York | 2020 |
| Advanced Payment Ecosystems Limited | Luton | 2022 |
| Advanced Personnel Systems Ltd | Tamworth | 1996 |
| Advanced Perspective Project Solutions Limited | Liverpool | 2017 |
| Advanced Portal Ltd | London | 2026 |
| Advanced Process Engineering & Simulation Services Ltd | | 2005 |
| Advanced Product Consulting Limited | Bristol | 2016 |
| Advanced Property Reporting Limited | Coventry | 2023 |
| Advanced Prototyping and Engineering Excellence Ltd | Uxbridge | 2020 |
| Advanced Quality Solutions NW Ltd | Liverpool | 2022 |
| Advanced Research Centre Ltd | Kington | 2026 |
| Advanced Research Cryptography Limited | Belfast | 2014 |
| Advanced Research Works Limited | Bath | 2025 |
| Advanced Retail (UK) Ltd | Ledbury | 2012 |
| Advanced Robotics and Computing Ltd | Chertsey | 2025 |
| Advanced Scaffolding Lmtd Ltd | Grimsby | 2022 |
| Advanced Shielding Technologies Ltd. | Alloa | 2002 |
| Advanced Simtech Limited | Stratford Upon Avon | 2008 |
| Advanced Software Group Limited | Newark | 2017 |
| Advanced Software Ltd | Nottingham | 2000 |
| Advanced Software Solutions Ltd | Uxbridge | 2012 |
| Advanced Solid Designs Ltd | Bloxwich | 2005 |
| Advanced Solution Partners Ltd | London | 2020 |
| Advanced Solutions for International Development Ltd | Mildenhall | 2018 |
| Advanced Solutions International (Europe) Limited | Shoreham-By-Sea | 2004 |
| Advanced Solutions Management Ltd | London | 2022 |
| Advanced Sparko IT Solutions Ltd | London | 2014 |
| Advanced Speech Solutions Limited | Clydebank | 2015 |
| Advanced Spirituality Ltd | Basingstoke | 2008 |
| Advanced Structural Detailing Limited | Leeds | 2017 |
| Advanced Studio Limited | London | 2020 |
| Advanced Study Ltd | Manchester | 2019 |
| Advanced System Solutions Ltd | Northamptonshire | 1998 |
| Advanced System Technologies Ltd | Horley | 1997 |
| Advanced Systems Group Limited | London | 2024 |
| Advanced Systems Management Ltd | Brentwood | 2003 |
| Advanced Talent Analytics Ltd | London | 2019 |
| Advanced Teamworks Limited | Tilbury | 2022 |
| Advanced Tech Services & Solutions Ltd | Northolt | 2022 |
| Advanced Tech Services Ltd | Ilford | 2026 |
| Advanced Technologies International Limited | London | 1984 |
| Advanced Technology Consultants Limited | Stockport | 1994 |
| Advanced Technology Group (110) Ltd | London | 2023 |
| Advanced Technology Networks Ltd | London | 2009 |
| Advanced Technology Partners Limited | Brierley Hill | 1997 |
| Advanced Technology Solutions Ltd | London | 2023 |
| Advanced Telecom Services (UK) Limited | London | 2001 |
| Advanced Television Limited | Oxford | 2000 |
| Advanced Testing Solutions Limited | Dronfield | 2015 |
| Advanced Thinking Resources Limited | Borehamwood | 2024 |
| Advanced Thinking Systems Ltd | Havant | 1994 |
| Advanced Threat Group Limited | Redditch | 2022 |
| Advanced Ticketing Limited | London | 1999 |
| Advanced Topographic Development and Images Ltd | London | 2020 |
| Advanced Totes Limited | Preston Farm Business Park | 2001 |
| Advanced Treasury Technologies Limited | Warminster | 1992 |
| Advanced Utility Fibre Networks Limited | Braintree, | 2023 |
| Advanced Vehicle Systems Ltd | Leicester | 2020 |
| Advanced Ventures Ltd | Ruislip, | 2021 |
| Advanced Weather Applications Ltd. | Edinburgh | 2009 |
| Advanced Web Concepts Limited | Bromley | 2006 |
| Advanced Web Designs Limited | Hoddesdon | 2000 |
| Advanced Websites Limited | Liverpool | 2026 |
| Advanced Work Management Limited | London | 1998 |
| Advanced Workflows Ltd | London | 2023 |
| Advanced World Live Limited | London | 2022 |
| Advanced-Assemblies Ltd | Poole | 2017 |
| Advanced.R.C Limited | Sutton | 2025 |
| Advancefirst Technologies Limited | Staines-Upon-Thames | 1998 |
| Advancement Book Club Ltd | Edgware | 2023 |
| Advancenet Europe Limited | Andover | 2002 |
| Advancenet Limited | Greenford | 2006 |