| Arbaro Consulting Limited | Salisbury | 2012 |
| Arbarr Electronics Limited | | 1991 |
| Arbarr-Ess Limited | Antrim | 2023 |
| Arbdob Limited | | 1991 |
| Arbe Integrated Engineering Limited | Bradford | 2012 |
| Arbeds Limited | Wakefield | 2024 |
| Arbee Plastic Fabrication Limited | Glasgow | 1992 |
| Arbel Electronics Limited | Pembrokeshire | 2005 |
| Arben Precision Sheet Metal Limited | Wokingham | 2007 |
| Arben Services Ltd | Essex | 2014 |
| Arber Healthcare Ltd | London | 2026 |
| Arbforest Ltd | Meriden | 2021 |
| Arbid & Shaer Advanced Products Ltd | London | 2023 |
| Arbikie Distilling Limited | Arbroath | 2013 |
| Arbil Limited | Stourbridge | 1978 |
| Arbiter Bespoke Limited | Farnham | 2016 |
| Arbitrary Holdings Limited | London | 2025 |
| Arbmasters Limited | Cumbria | 2006 |
| Arbo (Holdings) Limited | Derbyshire | 2007 |
| Arbor & Cove Limited | Bude | 2024 |
| Arbor & IVY Limited | Liverpool | 2025 |
| Arbor Ales Ltd | Bristol | 2006 |
| Arbor Bakery Ltd | Derry | 2021 |
| Arbor Bespoke Cabinet Makers Ltd | Pewsey | 2013 |
| Arbor Drums Limited | Cinderford | 2013 |
| Arbor Forest Products Limited | Barrow-Upon-Humber | 1951 |
| Arbor Garden Solutions Limited | Peterborough | 2016 |
| Arbor Interiors Group Limited | Nantwich | 2019 |
| Arbor Print Management Limited | Coalville | 2003 |
| Arbor Shepherd Huts Ltd | Chalgrove | 2017 |
| Arbor Vitae Limited | Castleford | 1999 |
| Arbor Yachts Ltd. | Emsworth | 2012 |
| Arbora Ltd | London | 2023 |
| Arborcraft Furniture Ltd | London | 2025 |
| Arborea Ltd. | London | 2015 |
| Arboreal Windows & Doors Ltd | London | 2025 |
| Arboreta Oak Frame Ltd | Caersws | 2014 |
| Arboretum Ltd | Warminster | 2023 |
| Arborin Ltd | London | 2026 |
| Arboris Luxury Scents Ltd | Helensburgh | 2022 |
| Arborscapes Ltd | Llantwit Major | 2019 |
| Arbortech Planting Products Limited | Bath | 2020 |
| Arbour Engineering Limited | Maldon | 1969 |
| Arbour Holdings Limited | Stockport | 2009 |
| Arbour Studio Limited | London | 2024 |
| Arbour Wood Ltd | Chatham | 2007 |
| Arbourne's Country Kitchen Limited | Swansea | 2014 |
| Arbr Limited | Ewhurst | 2013 |
| Arbre Chocolate Ltd | Bath | 2020 |
| Arbre Watches Limited | Watford | 2018 |
| Arbroath AD 1320 Limited | Arbroath | 2020 |
| Arburg Limited | | 1992 |
| Arbury Composites Ltd | Nuneaton | 2025 |
| Arbury Electrical Services Ltd | Corby | 2022 |
| Arbury Gates and Railings Ltd | Nuneaton | 2021 |
| Arbury Installations Ltd | Nuneaton | 2024 |
| Arbury Precision Engineering Ltd | Corby | 2022 |
| Arbury Stone Products Limited | Corby | 2023 |
| Arbury Tools & Equipment Limited | Nuneaton | 1962 |
| ARC (U.K.) Systems Limited | Basildon | 1992 |
| ARC Agricultural Engineers Ltd | Oxon | 2007 |
| ARC Alloys Limited | Brierley Hill | 1995 |
| ARC Applied Sciences Ltd | London | 2015 |
| ARC Auto Electrics Omagh Ltd | Omagh | 2015 |
| ARC Ballistics Limited | Dursley | 2016 |
| ARC Bespoke Ltd | Twickenham | 2023 |
| ARC Cider Limited | Bury St. Edmunds | 2023 |
| ARC CNC Limited | Circencester | 2019 |
| ARC Composites Ltd | Bolton | 2025 |
| ARC Decals Ltd | Manchester | 2025 |
| ARC DEV Global Limited | Bridgnorth | 2016 |
| ARC Digital Technology Solutions Ltd | London | 2023 |
| ARC Dimension Limited | Bolton | 2025 |
| ARC Displays Limited | Stratford-Upon-Avon | 2007 |
| ARC Dynamics Ltd | London | 2026 |
| ARC Edge Metalwork Ltd | Bridport | 2021 |
| ARC Electrical UK Services Limited | Wolverhampton | 2021 |
| ARC Elevators Limited | Colne | 2009 |
| ARC Engineering 2016 Ltd | Dunfermline | 2016 |
| ARC Engineering 2024 Ltd | Glasgow | 2024 |
| ARC Engineering Fabrication Limited | East Sussex | 1998 |
| ARC Engineering Solutions Ltd | Hemel Hempstead | 2026 |
| ARC Europe and Worldwide Limited | Tenterden | 2020 |
| ARC Fabrication Services Limited | Droitwich | 2026 |
| ARC Fabrications (King's Lynn) Limited | King'S Lynn | 1993 |
| ARC Fabrications Limited | London | 2005 |
| ARC Fabrics Limited | Loughborough | 1978 |
| ARC Force Construction Ltd | Fordingbridge | 2014 |
| ARC Glass and Bending Limited | St Helens | 2016 |
| ARC Guardian Ltd | Willenhall | 2025 |
| ARC Hi-Voltage Services Ltd | Bury St. Edmunds | 2024 |
| ARC Home Developments Limited | Co. Durham | 2020 |
| ARC Home Innovation Ltd | Norwich | 2026 |
| ARC Industrial Engineering Ltd | Mildenhall | 2026 |
| ARC Industrial Welding Limited | Oldham | 2018 |
| ARC Intellicare Limited | Lisburn | 2020 |
| ARC IPR Ltd | Whitland | 2024 |
| ARC Labels Limited | Goole | 1983 |
| ARC Lancaster Limited | Lancaster | 2010 |
| ARC Laser Cutting and Fabrication Ltd | Cramlington | 2014 |