| Automatic Standard Screw Co. (1983) Limited(The) | Park Square Leeds | 1983 |
| Automatic Test Services Limited | Uckfield | 1989 |
| Automatic Welding Systems Limited | Wiltshire | 2005 |
| Automatic Windings Limited | Legged Cross Wimborne | 1997 |
| Automatics Tooling Company Limited | Redhill | 1952 |
| Automation & Control Solutions Limited | Lytham St. Annes | 1999 |
| Automation 4 Ltd | Harrogate | 2004 |
| Automation AI Ltd | Kings Langley | 2022 |
| Automation and Maintenance Solutions Ltd | Mildenhall | 2023 |
| Automation and Robotic Technology Ltd | Leicester | 2019 |
| Automation and Robotics Limited | Bingham | 2022 |
| Automation Applications Ltd | Cheshire | 2007 |
| Automation Consultancy Group Limited | Bournemouth | 2016 |
| Automation Control Technology Ltd | Malvern | 2015 |
| Automation Control Warehouse Limited | Glasgow | 2013 |
| Automation Controls (Belfast) Limited | Belfast | 1978 |
| Automation Drives & Control Limited | Bradford-On-Avon | 1991 |
| Automation Engineering Ltd | London | 2018 |
| Automation Innovations Ltd | Manchester | 2025 |
| Automation One Ltd | Brighton | 2022 |
| Automation Products & Systems Ltd | Liverpool | 2010 |
| Automation REM Ltd | Rotherham | 2015 |
| Automation Sales Limited | Chippenham | 2001 |
| Automation Services Limited | Stoke-On-Trent | 1993 |
| Automation Solutions and Services Ltd | Warrington | 2011 |
| Automation Technologies Ltd | Brighton | 1989 |
| Automation Trader UK Ltd | London | 2020 |
| Automaton Systems Ltd | London | 2017 |
| Automatry Ltd | London | 2019 |
| Automax Motor Engineers Ltd | Sheffield | 2020 |
| Automd Limited | Birmingham | 2023 |
| Automedi Limited | Stockport | 2014 |
| Automet Limited | Preston | 2002 |
| Autometers Systems Limited | Stafford | 2003 |
| Automigo Ltd | Exeter | 2026 |
| Automill Engineering Limited | London | 1994 |
| Automo Seamu Ltd | London | 2025 |
| Automobili La'Bergitla Ltd | London | 2022 |
| Automotive & Body Repairs Limited | Wednesbury | 2015 |
| Automotive & Home Services Ltd | Elgin | 2020 |
| Automotive 1 Ltd | Preston | 2024 |
| Automotive Applied Technologies Ltd | London | 1986 |
| Automotive Artisans Limited | Worcester | 2025 |
| Automotive Bodyfillers Limited | Macclesfield | 1996 |
| Automotive Chassis Products UK Limited | Newton Aycliffe | 1988 |
| Automotive Cleaning Chemicals Ltd | Birmingham | 1984 |
| Automotive Component Remanufacturing Limited | Ellesmere Port | 1995 |
| Automotive Diagnostic Specialists Ltd. | Sevenoaks | 2017 |
| Automotive Energy Solutions Ltd | Bournemouth | 2024 |
| Automotive Engineering Solutions Ltd. | St Albans | 2012 |
| Automotive FIX Ltd | Southend-On-Sea | 2023 |
| Automotive Garage Equipment Limited | Bromsgrove | 2004 |
| Automotive Garage Services Limited | Keighley | 2008 |
| Automotive GAS Systems (N.I.) Ltd | Craigavon | 2013 |
| Automotive Group (Newcastle Upon Tyne) Limited | Newcastle Upon Tyne | 1991 |
| Automotive Handling Solutions Ltd | St. Neots | 2015 |
| Automotive I.T Ltd | Harrow | 2022 |
| Automotive Innovations Limited | Cinderford | 2023 |
| Automotive Investments Holdings Group UK Limited | Oxford | 2022 |
| Automotive Laser Polymer Welding Limited | Bedford | 2018 |
| Automotive Lift Services Ltd | Mansfield | 2014 |
| Automotive Lighting UK Limited | Llanelli | 1998 |
| Automotive Machine Tool Limited | Chester | 2005 |
| Automotive Macliver Limited | Birmingham | 1996 |
| Automotive Marine Ltd | Spetchley | 2016 |
| Automotive Part Services Ltd | London | 2021 |
| Automotive Performance Technologies Limited | London | 1998 |
| Automotive Precision Engineering Limited | Coventry | 2019 |
| Automotive Production Technologies Limited | Canvey Island | 1988 |
| Automotive Products Ltd | Northampton | 2024 |
| Automotive Protection Solutions Limited | Westbury | 2020 |
| Automotive Service Centre Limited | Belfast | 2017 |
| Automotive SL Ltd | Milton Keynes | 2021 |
| Automotive Sporting Heritage Limited | Haverhill | 2022 |
| Automotive Technicians Ltd | Westmidlands | 2013 |
| Automotive Technology (UK) Limited | Northamptonshire | 2006 |
| Automotive Trim Developments Limited | Coventry | 2000 |
| Automotive Woodworks Limited | Horsham | 2021 |
| Automotive-Electrical (Mirfield) Limited | Manchester | 1985 |
| Automotivegeneration Ltd | Wednesbury | 2021 |
| Automotiveworksolutions Ltd | Cambridge | 2024 |
| Automotocareplus Limited | Birmingham | 2025 |
| Autoneering Ltd | Rugeley | 2011 |
| Autoneum Great Britain Limited | Stoke-On-Trent | 1988 |
| Autonnic Research Limited | London | 1981 |
| Autonome Labs Ltd | London | 2019 |
| Autonomous Delivery Solutions Limited | Stoke-On-Trent | 2020 |
| Autonomous Devices Limited | Milton Keynes | 2014 |
| Autonomous Robotics Limited | Southampton | 2013 |
| Autonomy Auto Keys and Locksmiths Ltd | Rowley Regis | 2024 |
| Autonomy Designs Limited | Spalding | 2018 |
| Autonumis UK Limited | Stroud | 2025 |
| Autonymy UK Ltd | Milton Keynes | 2026 |
| Autool Grinders Limited | Clitheroe | 2000 |
| Autool Holdings Limited | Clitheroe | 2025 |
| Autopa Limited | Rugby | 1997 |
| Autopak Machinery Limited | Hereford | 2002 |
| Autopak Solutions Limited | Doncaster | 2019 |
| Autopart Manufacture Co., Limited | Beckenham | 2022 |
| Autopia Control and Automation Solutions Limited | Canvey Island | 2015 |