| Advanced Emergency Vehicles Limited | Barnsley | 2024 |
| Advanced Energy Minerals (UK) Limited | Richmond | 2020 |
| Advanced Energy Monitoring Systems Limited | Eastleigh | 1981 |
| Advanced Engineering (UK) Limited | Tamworth | 1978 |
| Advanced Engineering Solutions (JD) Limited | Redditch | 2001 |
| Advanced Engineering Solutions Limited | Walsall | 1995 |
| Advanced Engineering Techniques Limited | Sheffield | 1989 |
| Advanced Fabrication (Wellingborough) Limited | Wellingborough | 2022 |
| Advanced Fabrication and Engineering Ltd | Dronfield | 2026 |
| Advanced Fabrications (London) Limited | London | 2003 |
| Advanced Fabrications (UK) Ltd | Iver | 2017 |
| Advanced Fabrications Poyle Limited | Slough | 1983 |
| Advanced Fasteners Limited | Tadcaster | 2003 |
| Advanced Fibreoptic Engineering Limited | Carterton | 2005 |
| Advanced Fibres Ltd | Darlington | 2026 |
| Advanced Fire & Security Services Limited | Sheffield | 1996 |
| Advanced Fluid Solutions Ltd | Canvey Island | 2008 |
| Advanced Foam Solutions Limited | Birmingham | 2025 |
| Advanced Fuel Systems Limited | Great Chesterford | 2004 |
| Advanced Furnace Technology Ltd. | Cambridge | 1983 |
| Advanced Furniture Concepts Ltd. | High Wycombe | 2024 |
| Advanced Gate-Tec Ltd | Merthyr Tydfil | 2015 |
| Advanced General Precision Limited | Bedford | 2022 |
| Advanced Glass Technology (International) Limited | Hoddesdon | 2017 |
| Advanced Glazing Systems Limited | Essex | 2004 |
| Advanced Graphics London Studio Ltd | London | 2023 |
| Advanced Green Technology Ltd | London | 2025 |
| Advanced Grinding Solutions Ltd | Coventry | 2014 |
| Advanced Group (Scotland) Limited | Glasgow | 2003 |
| Advanced Group Global Holdings Ltd | Worcester | 2017 |
| Advanced Group Services Ltd | Washington | 1982 |
| Advanced Hall Sensors Limited | Cheadle | 2011 |
| Advanced Handling Limited | Warwick | 2011 |
| Advanced Healthcare Ltd. | Tonbridge | 1986 |
| Advanced Healthcare Systems Limited | Winsford | 1998 |
| Advanced Healthcare Technology Limited | Waltham Cross | 1992 |
| Advanced Home Improvements NE Ltd | Sunderland | 2025 |
| Advanced Hydraulics Ltd. | Keighley | 2010 |
| Advanced Hydrocarbon Fuels Ltd. | Markfield | 2014 |
| Advanced Images (Scotland) Limited | Glasgow | 2010 |
| Advanced Implant Laboratories Limited | Birmingham | 2022 |
| Advanced Industrial Engineering Limited | Tamworth | 2015 |
| Advanced Industrial Maintenance Services Ltd | Leicester | 2025 |
| Advanced Industrial Repair Group Ltd | Maidenhead | 2025 |
| Advanced Industrial Supplies Inc Ltd | Almondsbury | 2021 |
| Advanced Innergy Solutions Ltd | Gloucester | 1989 |
| Advanced Innovative Engineering (UK) Limited | Lichfield | 2012 |
| Advanced Innovative Manufacturing Limited | Lichfield | 2020 |
| Advanced Instruments Ltd. | London | 2010 |
| Advanced Insulation Systems Ltd | Gloucester | 2008 |
| Advanced Integrated Controls Ltd | Bradford | 2020 |
| Advanced Integrated Technologies Limited | St. Ives | 2024 |
| Advanced Integration Technology UK Limited | Manchester | 2026 |
| Advanced IPC Limited | Stockport | 2024 |
| Advanced Joinery (UK) Limited | Leeds | 2015 |
| Advanced Joinery Group Limited | Newcastle-Upon-Tyne | 2015 |
| Advanced Joint Network & Automation Systems Ltd. | Godalming | 2017 |
| Advanced Kitchens Ltd | Chester Le Street | 2026 |
| Advanced Labelling Systems Limited | Thame | 1997 |
| Advanced Laminates Limited | Coventry | 2007 |
| Advanced Laser Cleaning Ltd | Worsley, Manchester | 2021 |
| Advanced Lifting Solutions (SOT) Ltd | Congleton | 2026 |
| Advanced Lifting Technology Limited | Sheffield | 2014 |
| Advanced Lighting Technology (U.K.) Limited | Washington | 2011 |
| Advanced Lightning Protection Systems Limited | Bilston | 2017 |
| Advanced Locksmith Solutions Ltd | London | 2025 |
| Advanced Machine Services Ltd | Leeds | 2015 |
| Advanced Machinery Services Limited | Leicester | 2007 |
| Advanced Machining CNC Limited | London | 2018 |
| Advanced Machining Ltd | Leicester | 2015 |
| Advanced Magnetic Resonance Limited | Heanor | 2005 |
| Advanced Manufacturing (Sheffield) Limited | Rotherham | 2002 |
| Advanced Manufacturing Corporation UK Ltd | Quarry Road | 1985 |
| Advanced Manufacturing Services Ltd | Congleton | 2001 |
| Advanced Manufacturing Solutions Ltd | Llanymynech | 2022 |
| Advanced Manufacturing Utilisation Limited | Shrewsbury | 2013 |
| Advanced Marble and Granite UK Limited | Leeds | 2000 |
| Advanced Marine Decking Limited | Southampton | 2006 |
| Advanced Marine Structures Ltd | Ryde | 1999 |
| Advanced Marine Technical Services Co., Ltd | Beckenham | 2024 |
| Advanced Materials Applications Ltd | London | 2026 |
| Advanced Materials Ltd. | Littlehampton | 1998 |
| Advanced Mechanical Projects Ltd | Elland | 2016 |
| Advanced Medical Solutions Limited | Winsford | 1991 |
| Advanced Metal Castings Limited | Castle Gresley | 2016 |
| Advanced Metal Materials Technology Ltd | London | 2026 |
| Advanced Metal Products Limited | Redditch | 2013 |
| Advanced Metal Treatments Limited | Westbury | 2018 |
| Advanced Metalcraft Limited | Norwich | 2012 |
| Advanced Metalworks Limited | Nottingham | 2018 |
| Advanced Micro Peripherals Limited | Common Road, Witchford | 1993 |
| Advanced Milking Systems Limited | Cardigan | 2019 |
| Advanced Minerals Limited | Surrey | 1990 |
| Advanced Mobile Power Systems Limited | Droitwich | 2017 |
| Advanced Molecular Diagnostics Ltd | Nottingham | 2017 |
| Advanced Mortuary Systems Limited | Nottingham | 1990 |
| Advanced Moulds Limited | Ebbw Vale | 1979 |
| Advanced Multisect Group Limited | Silsden | 2010 |
| Advanced Navigation Limited | London | 2020 |
| Advanced Netting Ltd | Clacton-On-Sea | 2010 |