| ARC Lasers Ltd | Robertsbridge | 2023 |
| ARC Light Fabrications Ltd | Spalding | 2022 |
| ARC Mailing Limited | Radstock | 2008 |
| ARC Manufacturing Solutions Limited | Dursley | 2006 |
| ARC Mechanical and Electrical Ltd | Derby | 2011 |
| ARC Medical Design Limited | Southend-On-Sea | 2008 |
| ARC Metal Design Ltd | Oldbury | 2022 |
| ARC Metalcraft Limited | Plymouth | 2003 |
| ARC Modular Ltd | Wisbech | 2026 |
| ARC Multi-Metal Services Limited | London | 2005 |
| ARC Office Systems Limited | Sevenoaks | 2010 |
| ARC Parfums Ltd | Chelmsford | 2026 |
| ARC Polymers Ltd | Kingston Upon Thames | 2023 |
| ARC Precision Ltd | Poole | 2026 |
| ARC Repair Limited | Gateshead | 2017 |
| ARC Right Services Ltd | Preston | 2020 |
| ARC Screen Print Limited | Birmingham | 1991 |
| ARC Steel Erecting Ltd | Sutton-In-Ashfield | 2025 |
| ARC Steel Projects Limited | Newton Abbot | 2000 |
| ARC Sussex Carpentry Ltd | Brighton | 2026 |
| ARC Tech Group Ltd | London | 2016 |
| ARC Technologies Ltd | Whitland | 2024 |
| ARC Trailers Ltd. | Chorley | 2024 |
| ARC Vehicle Ltd | Whitland | 2024 |
| ARC Welding & Fabrication Ltd | Egremont | 2026 |
| ARC Welding Construction Ltd | Stibbington | 2015 |
| ARC Welding Services Limited | Birmingham | 2003 |
| ARC West Street Limited | Portsmouth | 2016 |
| ARC Windows & Doors Ltd | Newcastle Upon Tyne | 2025 |
| Arc-Iwe Limited | St. Neots | 2014 |
| Arc-Led Limited | Plymouth | 2020 |
| Arc-Met Ltd | Ballymena | 2022 |
| Arc-Rite Engineering Limited | Sheffield | 2021 |
| Arc-Tech Engineering Ltd | Burnley | 2020 |
| Arc-Tic Milburn Engineers Limited | Darlington | 1972 |
| Arc-Up Welding Services Limited | Stanley | 2015 |
| Arc-Work Ltd | Aberdeen | 2010 |
| Arca Bespoke Furniture Ltd | Hampton | 2020 |
| Arca Developments Ltd | Poole | 2025 |
| Arca Industries Limited | Weybridge | 2013 |
| Arcab UK Ltd | London | 2017 |
| Arcade (U K) Limited | Kimbolton | 1975 |
| Arcade Depot Limited | Stoke On Trent | 2019 |
| Arcade Didcot Ltd | Cardiff | 2023 |
| Arcade Experts Limited | Malvern | 2005 |
| Arcade Geeks INT Ltd | Stourport-On-Severn | 2021 |
| Arcade Mania Gaming Limited | Barnsley | 2021 |
| Arcade Mania Global Limited | Birmingham | 2019 |
| Arcade Parts Limited | Blackpool | 2023 |
| Arcade Planet Limited | Doncaster | 2023 |
| Arcadegame Ltd | Solihull | 2020 |
| Arcadia Desiccant Technology Limited | Rickmansworth | 2021 |
| Arcadia Design & Build Ltd | 22 Carlton Road | 2018 |
| Arcadia Food Industries Limited | Bradford | 1990 |
| Arcadia Foods Limited | Bradford | 2006 |
| Arcadia Industries Limited | Bradford | 2006 |
| Arcadia Innovation Ltd | Birmingham | 2023 |
| Arcadia Pharma Limited | Swansea | 2013 |
| Arcadia Pods Ltd | Dalkeith | 2023 |
| Arcadia Rose Limited | Chadderton | 2023 |
| Arcadian Industries Ltd | Birmingham | 2018 |
| Arcana Holistic Herbal Ltd | Belper | 2020 |
| Arcana Skin Ltd | Edinburgh | 2020 |
| Arcane Footwear Technology Ltd | Glasgow | 2020 |
| Arcane Jewels Ltd | Thornton Heath | 2025 |
| Arcane London Ltd | London | 2026 |
| Arcane Syndicate Ltd | Middlesbrough | 2025 |
| Arcangel Limited | Hitchin | 1999 |
| Arcania Apothecary Ltd | Wells | 2000 |
| Arcanum Perfumes Limited | London | 2026 |
| Arcaras Limited | Stockport | 2024 |
| Arcasaporis Cakes and Bakes Limited | Coventry | 2026 |
| Arcato Limited | Oldbury | 2025 |
| Arccass Limited | Rotherham | 2017 |
| Arccos Caddie Ltd | Chiswick | 2022 |
| Arceclipse Ltd | London | 2023 |
| Arcelo Design Ltd | Loughborough | 2023 |
| Arcelo Limited | Peckleton | 2023 |
| Arcelor SSC UK Barking Limited | Willenhall | 1990 |
| Arcelormittal Building Solutions UK Limited | Manchester | 2000 |
| Arcelormittal Construction UK Limited | Rowley Regis | 2009 |
| Arcelormittal Distribution Solutions UK Limited | Willenhall | 1982 |
| Arcelormittal Kent Wire Limited | Chatham | 1987 |
| Arcelormittal Sheffield Limited | Sheffield | 1988 |
| Arcelormittal Tailored Blanks Birmingham Limited | Birmingham | 1997 |
| Arcenciel Manwema UK Ltd | Salford | 2024 |
| Arceon Ltd | Ashford | 2026 |
| Arcflex Hose & Bellows Limited | Rochester | 1987 |
| Arcforce Engineering Services Limited | Reading | 2012 |
| Arcforce Welding Ltd | Maidenhead | 2025 |
| Arcform Fabrications Limited | Brighouse | 2008 |
| Arcform Limited | Wrexham | 2003 |
| Arch 5 Design Limited | London | 2008 |
| Arch Aluminium and Upvc Ltd | Hertford | 2019 |
| Arch Bespoke Joinery Ltd | Stamford | 2026 |
| Arch Bronze Limited | London | 2013 |
| Arch Catering and Refrigeration Ltd | Stevenage | 2021 |
| Arch Dental Laboratory Ltd | Sheffield | 2015 |
| Arch Doors and Windows Supply Ltd | Wolverhampton | 2024 |
| Arch Doors&Windows Limited | Wolverhampton | 2022 |