| ARK Carpentry Contractors Limited | Redditch | 2023 |
| ARK Carpentry Services Ltd | Stockport | 2026 |
| ARK CR8'S Limited | Killingworth | 2022 |
| ARK Developments (Midlands) Limited | Burton-On-Trent | 2003 |
| ARK Displays Ltd | Leeds | 2025 |
| ARK Electric Ltd | Nottingham | 2025 |
| ARK Electrical Contracts Limited | Bury St. Edmunds | 2013 |
| ARK Engineering Ltd | Corby | 2021 |
| ARK Feris Limited | Nottingham | 2024 |
| ARK Fleetech Ltd | Chorley | 2013 |
| ARK Global Foods Ltd | Mildenhall | 2025 |
| ARK Holdings (West Yorkshire) Limited | Chelmsford | 2023 |
| ARK ICT Solutions Ltd | Spalding | 2005 |
| ARK Industrial Ltd | London | 2021 |
| ARK Integrated Solutions Ltd | Ballynahinch | 2017 |
| ARK Kitchen Services Ltd | Milton Keynes | 2019 |
| ARK Kitchens and Joinery Limited | Beverley | 2010 |
| ARK Kitchens Online Ltd | Rugby | 2024 |
| ARK Lighting Ltd | Barnsley | 2010 |
| ARK Metrica Ltd | Oxford | 2019 |
| ARK Mobile Ltd | Manchester | 2025 |
| ARK Organs Limited | Northampton | 2015 |
| ARK Pallets and Fencing Limited | Halifax | 2003 |
| ARK Perfumeries Limited | London | 2018 |
| ARK Pharma Graphics Limited | Northampton | 2002 |
| ARK Plastics Limited | Accrington | 2005 |
| ARK Precision Engineering Limited | Chelmsford | 1998 |
| ARK Print Limited | Saffron Walden | 2012 |
| ARK Profiles Ltd | Armagh | 2014 |
| ARK Publication Ltd | Manchester | 2020 |
| ARK Racing Limited | Willenhall | 2003 |
| ARK Remedy CIC | London | 2023 |
| ARK Signs Limited | Cramlington | 2001 |
| ARK Solutions Limited | Hereford | 2023 |
| ARK Stained Glass and Leaded Lights Limited | Lichfield | 2009 |
| ARK Sweets Limited | Bradford | 2018 |
| ARK Woodwork Ltd | Hull | 2016 |
| ARK Wrought-Ironwork Ltd | Maidenhead | 2003 |
| ARK1 Limited | East Sussex | 2007 |
| ARK360 EDU Ltd | London | 2023 |
| Arka 12 Ltd | Teddington | 2024 |
| Arka Lumina Ltd | Salford | 2026 |
| Arkadia Textiles Limited | Rochdale | 2026 |
| Arkalune Limited | London | 2026 |
| Arkan (Kent) Holdings Ltd | Ashford | 2025 |
| Arkane Inc. Ltd | Abingdon | 2021 |
| Arkanoid Limited | Goole | 1992 |
| Arkas Group Ltd | Bradford | 2025 |
| Arkas Limited | Maidstone | 1988 |
| Arkay Imaging Limited | | 2006 |
| Arkay Timber Products Limited | Swansea | 2021 |
| Arkbe Studios Ltd | Stroud | 2026 |
| Arkbridge Trading Limited | Bristol | 2026 |
| Arked Coffee Ltd | Bradford | 2026 |
| Arkel Computer Services Limited | Market Harborough | 1982 |
| Arkell's Brewery Limited | Swindon | 1927 |
| Arkell's Electrics Ltd | Bideford | 2021 |
| Arkema UK Limited | Stafford | 2011 |
| Arken POP International Ltd | London | 2010 |
| Arken Watch Company Limited | Lichfield | 2021 |
| Arkey-Fs Limited | Coventry | 2021 |
| Arkford Ltd | Newtownards | 2017 |
| Arkheon Global Brand Management Ltd | Kington | 2025 |
| Arkheon Ltd | Kington | 2025 |
| Arkhitekton Technology & Manufacturing Limited | London | 2026 |
| Arkinstall Galvanizing Limited | Birmingham | 2008 |
| Arkinstall Limited | Digbeth | 2008 |
| Arkke Ltd | Cheltenham | 2025 |
| Arklavo Ltd | Antrim, Carrickfergus | 2024 |
| Arkle Engineering Limited | Redditch | 1983 |
| Arkley Labels Trading Limited | New Barnet | 2023 |
| Arkley Reprographics Ltd | Folkestone | 2021 |
| Arkobinks Ltd | Glasgow | 2009 |
| Arkog Ltd | Glasgow | 2020 |
| Arkon Services Limited | Cheltenham | 2016 |
| Arkoni Limited | Halifax | 1987 |
| Arkoo Ltd | Sale | 2021 |
| Arkote Limited | Sheffield | 2002 |
| Arkq Limited | Surrey | 2005 |
| Arkray Factory Ltd. | High Wycombe | 1985 |
| Arkrite Fencing Manufacturers Limited | Cannock | 1973 |
| Arks Designers Limited | Staines-Upon-Thames | 2014 |
| Arks Holdings Limited | London | 2019 |
| Arksen Limited | Haywards Heath | 2017 |
| Arkt Coachworks Ltd | Cumnock | 2019 |
| Arktech (NE) Limited | Washington | 2009 |
| Arktis Endurance Textiles Ltd | Ballymena | 2017 |
| Arktis Radiation Detectors UK Limited | Farnham | 2017 |
| Arkus Limited | St Ives | 2016 |
| ARL Appliance Repair Ltd | Bristol | 2024 |
| ARL Bespoke Joinery Ltd | Blackburn | 2024 |
| ARL Voiceover Ltd | Leicester | 2020 |
| Arla Foods Finance Limited | Leeds | 2005 |
| Arla Foods Ingredients Felinfach Limited | Leeds | 2023 |
| Arla Foods Ingredients TAW Valley Limited | Leeds | 2010 |
| Arla Foods Ingredients UK Limited | Leeds | 2010 |
| Arla Foods Limited | Leeds Valley Park | 1987 |
| Arla Foods UK Investments Limited | Leeds | 1942 |
| Arla Foods UK PLC | Leeds | 1998 |
| Arla Foods UK Services Ltd. | Leeds | 1989 |