| Advanced Medical Management Limited | Chatham | 2015 |
| Advanced Medical Services Limited | Beaconsfield | 1994 |
| Advanced Medical Simulation Online Limited | Cardiff | 2015 |
| Advanced Medical Solutions (Europe) Limited | Winsford | 2013 |
| Advanced Medical Solutions (UK) Limited | Winsford | 1994 |
| Advanced Medical Solutions Group PLC | Winsford, | 1993 |
| Advanced Medicinal Consulting Ltd | London | 2025 |
| Advanced Medicine and Innovation Limited | London | 2015 |
| Advanced Medicine Limited | Wilmslow | 2010 |
| Advanced Medpharma Ltd | Leeds | 2026 |
| Advanced Metal Consultancy Limited | Sheffield | 2026 |
| Advanced Metallurgical Services Limited | Oldham | 1990 |
| Advanced Metocean Ltd | Glasgow | 2025 |
| Advanced Micro Lubrication Limited | Leicester | 1994 |
| Advanced Minibus Limited | Southampton | 2009 |
| Advanced Motion Systems Ltd | Bath | 2020 |
| Advanced MP Technology (UK) Limited | London | 1996 |
| Advanced Music Systems Limited | Burnley | 2014 |
| Advanced Nano Technologies & Scientific Limited | Woking | 2009 |
| Advanced Nanoparticles Limited | London | 2025 |
| Advanced Nanostructured Materials Design and Consultancy (Anamad) Limited | Brighton | 2018 |
| Advanced NDT Inspection Solutions Ltd | Warrington | 2021 |
| Advanced NDT Solutions Limited | Glasgow | 2022 |
| Advanced Network Technologies Ltd. | London | 2019 |
| Advanced Noise Solutions Limited | Welwyn Garden City | 2002 |
| Advanced Office Support Ltd | Haslemere | 2003 |
| Advanced Operations Management Limited | Rochford | 2017 |
| Advanced Ophthalmic Systems Ltd | Weybridge | 2020 |
| Advanced Parking Solutions Limited | London | 2024 |
| Advanced People Strategies Limited | Daventry | 2004 |
| Advanced Performance AI Ltd | Braintree | 2026 |
| Advanced Performance Management Ltd | Stratford-Upon-Avon | 2024 |
| Advanced Personnel Management Group (UK) Limited | London | 2003 |
| Advanced Personnel Management Holdings (UK) Limited | London | 2008 |
| Advanced Pet Care Ltd | Shrewsbury | 2010 |
| Advanced Pet Care Services Ltd | London | 2023 |
| Advanced Photo Ltd | Manchester | 2024 |
| Advanced Pipeline Rehabilitation and Training Limited | Bolton | 1994 |
| Advanced Planning and Controls Limited | Ruislip, | 2023 |
| Advanced Plant Hire Ltd | Omagh | 2022 |
| Advanced Plasma Power Limited | London | 2005 |
| Advanced Plastics (Intermediate 1) Limited | Fareham | 2009 |
| Advanced Plastics Group Limited | Hull | 2007 |
| Advanced Power Engineering Solutions Ltd | Ashford | 2013 |
| Advanced Power Technology Limited | Ilkley | 1990 |
| Advanced Precision Marketing Ltd | Carshalton | 2011 |
| Advanced Precision Technologies Ltd | Chatteris | 2021 |
| Advanced Print (E.K.) Ltd. | 45 Waterloo Street | 1998 |
| Advanced Process Design Limited | London | 2024 |
| Advanced Process Integration Limited | Manchester | 2021 |
| Advanced Process Solutions Limited | West Midlands | 2007 |
| Advanced Processing Group Limited | Rugby | 2021 |
| Advanced Procurement Limited | Seaford | 2008 |
| Advanced Product Delivery Limited | Swindon | 2015 |
| Advanced Product Solutions Limited | Eastleigh | 2011 |
| Advanced Professional Services Ltd | Thirsk | 2006 |
| Advanced Progression Limited | Baildon | 2025 |
| Advanced Project Concepts Ltd | Southend-On-Sea | 2025 |
| Advanced Project Technology Limited | Cambridge | 1994 |
| Advanced Proptech Intelligence Ltd | London | 2026 |
| Advanced Propulsion Centre UK Limited | London | 2013 |
| Advanced Quality Consultancy Limited | London | 2020 |
| Advanced Quality Management Limited | Prestatyn | 2014 |
| Advanced Racing Management Limited | Prestonpans | 2025 |
| Advanced Radiation Protection Ltd | Bishop Auckland | 2025 |
| Advanced Reaction Motor Systems Limited | Oswestry | 2014 |
| Advanced Realtime Cargo Technologies Ltd | Wokingham | 2009 |
| Advanced Renewable Energy Ltd | Hooton | 2025 |
| Advanced Reporting UK Ltd | London | 2026 |
| Advanced Reports Ltd | Radlett | 2020 |
| Advanced Research & Technology Limited | Nottingham | 1998 |
| Advanced Research Ltd | Poole | 2013 |
| Advanced Resource Managers Limited | Portsmouth | 2004 |
| Advanced Resource Managers Training Limited | Portsmouth | 2001 |
| Advanced Retail Co-Ordination Limited | Derby | 1996 |
| Advanced Rigging Solutions Limited | Middlesbrough | 2019 |
| Advanced Risc Machines Limited | Cambridgeshire | 1998 |
| Advanced Risk Management Ltd | Colchester | 2008 |
| Advanced Risk Management Solutions Ltd | Little Witley | 2008 |
| Advanced Robotic Services Ltd. | Edinburgh | 2021 |
| Advanced Robotic Technology Ltd | Salford | 2010 |
| Advanced Roofing & Flooring Limited | Stanton-By-Dale | 2007 |
| Advanced Rope Access Ltd. | Glasgow | 2008 |
| Advanced Safety Response Ltd. | Abingdon | 2014 |
| Advanced Sampling Process Instruments Limited | Glasgow | 2014 |
| Advanced Scientific Materials Acquico Limited | Huntingdon | 2021 |
| Advanced Scientific Materials Limited | Huntingdon | 2013 |
| Advanced Scientific Materials Pledgeco Limited | Huntingdon | 2021 |
| Advanced Secure Technologies Holdings Ltd | Cardiff | 2006 |
| Advanced Security Solutions Ltd | London | 2026 |
| Advanced Sensing Technologies Ltd. | London | 2014 |
| Advanced Services Group Limited | Birmingham | 2015 |
| Advanced Services Ltd | Norwich | 2016 |
| Advanced Setting OUT Limited | Nottingham | 2026 |
| Advanced Signs Systems Ltd | London | 2020 |
| Advanced Simulation Ltd | Woking | 2024 |
| Advanced Skills Consulting Limited | Leicester | 2025 |
| Advanced Solutions and Technologies Limited | Tiverton | 2014 |
| Advanced Solutions Consultants Limited | Ilford | 2005 |
| Advanced Space Manufacturing Systems Ltd | Croscombe | 2019 |