| Advanced Electric Powertrain Solutions Limited | Swindon | 2024 |
| Advanced Electrical Design Ltd. | Rugby | 2024 |
| Advanced Electronic Security Limited | Woking | 2012 |
| Advanced Energetic Materials Ltd | Leeds | 2010 |
| Advanced Energy Equity Ventures Ltd | Tonbridge | 2024 |
| Advanced Energy Industries U.K. Limited | Littlehampton | 1993 |
| Advanced Energy Protection Limited | Boldon Colliery | 2026 |
| Advanced Energy Synergy Ltd | London | 2016 |
| Advanced Engineered Solutions Limited | Esher | 2021 |
| Advanced Engineering (Middleton) Limited | Sandy | 2011 |
| Advanced Engineering Design Ltd | Glasgow | 2017 |
| Advanced Engineering Modelling Solutions Ltd | Bromley | 2012 |
| Advanced Engineering Services (International) Limited | Liverpool | 2003 |
| Advanced Engineering Solutions (UK) Limited | Newcastle Upon Tyne | 2010 |
| Advanced Engineering Surveys Ltd | London | 2023 |
| Advanced Engineering Workshops Ltd | Doncaster | 2023 |
| Advanced Engravers (NE) Ltd | Sunderland | 2018 |
| Advanced Entrance Systems Ltd | Halifax | 2014 |
| Advanced Envelopes Limited | London | 2021 |
| Advanced EPI Materials and Devices Ltd | Leamington Spa | 2015 |
| Advanced Equine Limited | Great Dunmow | 2011 |
| Advanced Estimating Services Ltd | Kilmarnock | 2020 |
| Advanced Europe Services Ltd | Kington | 2010 |
| Advanced Excellence Limited | Exeter | 2026 |
| Advanced FEA Ltd | Thurmaston | 2017 |
| Advanced Fire & Security Pembs Ltd | Haverfordwest | 2021 |
| Advanced Flooring Limited | Huddersfield | 1997 |
| Advanced Fluoropolymer Technology Limited | Stevenage | 2007 |
| Advanced Formwork Solutions Ltd | Abergavenny | 2025 |
| Advanced Fuel Solutions (Chester) Limited | Chester | 2012 |
| Advanced Fuel Technologies UK Limited | Tetbury | 2010 |
| Advanced Fusion Modelling Ltd | Derby | 2026 |
| Advanced Fw/Sw Solutions Limited | Bury St. Edmunds | 2013 |
| Advanced Generation Contracts Ltd | Leeds | 2020 |
| Advanced Generation Global Ltd | Coventry | 2022 |
| Advanced Generation Limited | Leeds | 2015 |
| Advanced Genetic Research Ltd | London | 2015 |
| Advanced Genomics Limited | Birmingham | 2020 |
| Advanced Global Technology Management Ltd | Orpington | 2016 |
| Advanced Group (Scotland) Holdings Ltd | Glasgow | 2015 |
| Advanced Group Holdings Limited | Uxbridge | 2016 |
| Advanced Hair Studios Group Limited | London | 1999 |
| Advanced Health Ventures Limited | London | 2016 |
| Advanced Holdings Limited | Doncaster | 2005 |
| Advanced Home Automation Ltd | Bury St. Edmunds | 2023 |
| Advanced Horizons Limited | Wimborne | 2017 |
| Advanced HR Ltd | Harpenden | 2025 |
| Advanced Hydration Technology Ltd | Cardiff | 2016 |
| Advanced in Services Ltd | Wembley | 2006 |
| Advanced Industrial Repairs Limited | Matlock | 2023 |
| Advanced Industries Strategic Resources Limited | Sittingbourne | 2024 |
| Advanced Information Resourcing Limited | Harrow | 1994 |
| Advanced Infrastructure Technology Ltd | Nantwich | 2020 |
| Advanced Inkjet Solutions Ltd | Cambridge | 2023 |
| Advanced Innergy Group Ltd | Gloucester | 2014 |
| Advanced Innergy Holdings Ltd | Gloucester | 2014 |
| Advanced Innergy Ltd | Gloucester | 2007 |
| Advanced Innergy Testing Ltd | Gloucester | 2003 |
| Advanced Innovative Investments Limited | Lichfield | 2015 |
| Advanced Inspection & Marine Services Limited | Jarrow | 2011 |
| Advanced Integrated Security Limited | Benfleet | 2009 |
| Advanced Integration Ltd | London | 2014 |
| Advanced Interactive Materials Science Limited | Birmingham | 2012 |
| Advanced Interior Solutions North East Limited | North Shields | 2010 |
| Advanced Interiors Management Ltd | Preston | 2025 |
| Advanced International Manufacturing Limited | Chester | 2015 |
| Advanced KFS Fabrication Limited | Southampton | 2016 |
| Advanced Layout Solutions Limited | Reading | 1995 |
| Advanced Learning Associates Limited | Grange-Over-Sands | 2002 |
| Advanced Legal and Consultancy Services Limited | Bromley | 2021 |
| Advanced Legal Consultants Limited | Manchester | 2014 |
| Advanced Lighting Technologies Europe Limited | Rickmansworth | 1995 |
| Advanced Locksmiths Ltd | Eastleigh | 2000 |
| Advanced Logistical Trading Ltd | Brampton | 2013 |
| Advanced Logistics Solutions Ltd | Aberdeen | 2024 |
| Advanced Machine Maintenance Limited | Chesterfield | 2016 |
| Advanced Machining Solutions Limited | Leeds | 2009 |
| Advanced Machining Techniques Limited | Ringwood | 1994 |
| Advanced Maintenance Solutions Limited | Caldicot | 2001 |
| Advanced Management (UK) Limited | London | 2011 |
| Advanced Management Consultancy Ltd | Lincoln | 2017 |
| Advanced Management Skills Limited | London | 1988 |
| Advanced Management Solutions (AMS) UK Limited | London | 2013 |
| Advanced Management Strategies Limited | London | 2016 |
| Advanced Manufacturing Development Services Limited | Worcester | 2001 |
| Advanced Manufacturing Group Limited | Nelson | 2022 |
| Advanced Marine Innovation Technology Subsea Limited | Hampshire | 1999 |
| Advanced Marine Tenders Ltd | Maidenhead | 2019 |
| Advanced Marketing Consulting Limited | Ilford | 2018 |
| Advanced Marketing Solutions North West Ltd | Lytham St. Annes | 2024 |
| Advanced Material Development Limited | Farnborough | 2017 |
| Advanced Materials Advisors Ltd | St. Austell | 2024 |
| Advanced Materials Engineering Consultants Ltd. | Swansea | 2013 |
| Advanced Materials Solutions Limited | Stoke-On-Trent | 2003 |
| Advanced Matrix Composite Systems Limited | London | 2022 |
| Advanced Measurement Group Ltd | Lutterworth | 2018 |
| Advanced Mechanical Electrical Solutions Ltd | Gravesend | 2024 |
| Advanced Mechanical Systems Ltd | Bristol | 2014 |
| Advanced Mechatronics UK Limited | Congleton | 2020 |
| Advanced Medical Analytics Limited | Sidcup | 2019 |