| Architectural Engineering (Contracts) Limited | Skelmersdale | 2008 |
| Architectural Engineering Ltd | Skelmersdale | 2014 |
| Architectural Envelope Solutions Ltd | Walsall | 2024 |
| Architectural Fibreglass Mouldings Limited | Accrington | 2003 |
| Architectural Framing Ltd | Chorleywood | 2025 |
| Architectural Glass and Aluminium Limited | Leeds | 2019 |
| Architectural Lead & Metalwork (London) Ltd | Maidstone | 2024 |
| Architectural Lettering Limited | | 1960 |
| Architectural Metal and Glass Ltd | Chesterfield | 2019 |
| Architectural Metal Craftsmen Ltd | Northants | 2006 |
| Architectural Metal Solutions Ltd | Ware | 2011 |
| Architectural Metals Limited | Reading | 2001 |
| Architectural Metalwork Installations Limited | Sheffield | 2007 |
| Architectural Metalworkers Limited | Washington | 1997 |
| Architectural Mould Services Limited | Trowbridge | 2000 |
| Architectural Oak Limited | Chippenham | 2004 |
| Architectural Panel Solutions Limited | London | 2018 |
| Architectural Panels Limited | Wednesbury | 1987 |
| Architectural Plastering & Building Services Ltd | Rotherham | 2012 |
| Architectural Plastering Limited | Romford | 2004 |
| Architectural Products Limited | Penryn | 1995 |
| Architectural Renovations & Design Brun Ltd. | London | 2012 |
| Architectural Stainless Design Ltd | Nuneaton | 2012 |
| Architectural Stainless Interiors Limited | Stourbridge | 2003 |
| Architectural Stainless Swimming Pool Products Ltd | Leigh-On-Sea | 2003 |
| Architectural Steel Fabrications Ltd | Colchester | 2011 |
| Architectural Steel-Links Ltd | Quorn | 2012 |
| Architectural Stone Ltd | Lisburn | 1995 |
| Architectural Structures Limited | Mobberley | 2012 |
| Architectural Systems Technology Limited | Portsmouth | 1998 |
| Architectural Timber Frames Limited | Dungannon | 2017 |
| Architectural Vision Systems Limited | Margate | 2011 |
| Architecture Design European Ltd | Cardiff | 2013 |
| Architecture Manufacturing Construction Ltd | High Wycombe | 2025 |
| Architen Limited | Chepstow | 1986 |
| Architeuthis Limited | Bath | 1984 |
| Archival & Conservation Materials Limited | Hinckley | 2013 |
| Archivd Carbon Ltd | Stockport | 2025 |
| Archive Atelier Ltd | London | 2011 |
| Archive Smart Ltd | London | 2019 |
| Archivision London Limited | Chinnor | 2017 |
| Archivist Limited | Penley | 2004 |
| Archivist Press Limited | Wellingborough | 2020 |
| Archlight Ltd | Docklands | 2023 |
| Archoak Aviation Ltd | Alton | 2013 |
| Archplan Limited | Beverley | 2012 |
| Archtec (NI) Ltd | Newry | 2005 |
| Archtop Joinery Limited | Ashbourne | 2012 |
| Archtwain Global Ltd | London | 2025 |
| Archway (T C S) Limited | Croydon | 2001 |
| Archway Aviation Services Limited | Belfast | 2025 |
| Archway Brown Limited | Pershore | 2005 |
| Archway Business Solutions Ltd | Reading | 2011 |
| Archway Engineering (U.K.) Limited | West Yorkshire | 1991 |
| Archway Horizon Limited | Walsall | 2021 |
| Archway Plastic Builders Ltd | Perranporth | 2025 |
| Archway Sheet Metal Works Limited | London | 1980 |
| Archway Steel Ltd | London | 2024 |
| Archway Wrought Iron Limited | Bournemouth | 2019 |
| Archwood Limited | Wrexham | 1986 |
| Archworksco Ltd | Swadlincote | 2025 |
| Arcido Ltd | Glasgow | 2015 |
| Arcik Trans Ltd | Didcot | 2023 |
| Arcis Biotechnology Limited | London | 2013 |
| Arcis Bricks Limited | Birkenhead | 2025 |
| Arclight Joinery Ltd | London | 2019 |
| Arclin UK Holdings Limited | Warrington | 2025 |
| Arclyde Limited | Stoke-On-Trent | 2025 |
| Arcmilano Ltd | Newcastle Upon Tyne | 2026 |
| Arcmore Engineering Limited | Aylesford | 2003 |
| Arcn Designs Ltd | St. Albans | 2017 |
| Arcnative Ltd | Coventry | 2023 |
| Arco England Limited | Warminster | 2008 |
| Arco London Ltd | London | 2016 |
| Arco Pipework Systems Limited | Birmingham | 2006 |
| ARCO1 Ltd | Sheffield | 2020 |
| Arcobuild (UK) Ltd | Stonehouse | 2008 |
| Arcoframe Ltd | St Helens | 2002 |
| Arcol Design Limited | Birmingham | 2006 |
| Arcol Engineering Limited | Colne | 2005 |
| Arcol U.K. Limited | Cornwall | 1952 |
| Arcola Products Limited | Sittingbourne | 1971 |
| Arcole Building Ltd | London | 2023 |
| Arcology System Limited | Milton Keynes | 2019 |
| Arcomedical Infusion Limited | Stafford | 1992 |
| Arconia Engineering Ltd | North Shields | 2008 |
| Arconic Closure Systems International (UK) Limited | Birmingham | 1959 |
| Arconic Manufacturing (GB) Limited | Birmingham | 1959 |
| Arcot Engineering Company Limited | Cramlington | 1986 |
| Arcotex Limited | Oldham | 2025 |
| Arcova Lighting Ltd | Ingatestone | 2026 |
| Arcpoint Fabrication Ltd | Wirral | 2026 |
| Arcradar Inspection and Fabrication Services Limited | Leicester | 2023 |
| Arcrite (GB) Limited | Corby | 2007 |
| Arcs and Sparks Limited | Carmarthen | 2026 |
| Arcs Audio Limited | London | 2016 |
| Arcs London Ltd | London | 2021 |
| Arcsett Limited | Manchester | 2020 |
| Arcsteel Engineering Ltd | Salford | 2026 |
| Arctech Fabrication Ltd | Claydon | 2019 |