| AC Composites Limited | Huntingdon | 2018 |
| AC Craft Ltd | London | 2024 |
| AC Crofts Engineering Ltd | Walsall | 2022 |
| AC Dairies Limited | Annan | 2021 |
| AC Digital Ltd | London | 2021 |
| AC Electrical GY Limited | Grimsby | 2015 |
| AC Engineering (Byfleet) Limited | Surrey | 2003 |
| AC Engineering (Magherafelt) Ltd | Fintona | 2010 |
| AC Express Kitchens Ltd | Retford | 2025 |
| AC Fabrication Cornwall Ltd | St. Austell | 2024 |
| AC Fabs Ltd | Shipley | 2026 |
| AC Furniture Limited | Birmingham | 1996 |
| AC Global Limited | Par | 2013 |
| AC Group Projects Ltd | Liverpool | 2016 |
| AC Joinery & Carpentry Ltd | Pulborough | 2026 |
| AC Kitchen Ltd | Rowley Regis | 2026 |
| AC Laboratories Limited | Manchester | 2019 |
| AC Laminators Ltd | Waterlooville | 2025 |
| AC Lifts Ltd | South Normanton | 2023 |
| AC Maintenance (Coventry) Limited | Newquay | 2019 |
| AC Media London Ltd. | London | 2022 |
| AC Midlands Recovery Ltd | Walsall | 2018 |
| AC Motor Group Limited | Maidenhead | 2017 |
| AC Paint Ltd | Cambridge | 2025 |
| AC Plastics Limited | Liverpool | 1987 |
| AC Precision Engineering Limited | Faringdon | 2003 |
| AC Pro Ltd | Colchester | 2025 |
| AC Promos Limited | Crewe | 2026 |
| AC Refrigeration & Air Conditioning Ltd | Newton Le Willows | 2025 |
| AC Rigging and Lifting Ltd | Southampton | 2024 |
| AC Services (England) Limited | Letchworth Garden City | 2006 |
| AC Services (S.E.) Ltd | Dartford | 2016 |
| AC Services (Southern) Limited | Bristol | 2000 |
| AC Signs Limited | Leeds | 2022 |
| AC Snooker Ltd | Stafford | 2026 |
| AC Sports Ltd | Sutton | 2025 |
| AC ST Ives Limited | Plymouth | 2023 |
| AC Steel Fabrication Ltd | Romford | 2014 |
| AC Supplies (2017) Limited | Bolton | 2017 |
| AC Supplies Ltd | Rowlands Gill | 2013 |
| Ac-Cess Co UK Limited | Aberdeen | 2003 |
| Ac-Manufacturing Ltd | Bognor Regis | 2022 |
| Ac-P Fabrications Limited | Hull | 2019 |
| Ac-Tech Management Limited | London | 2003 |
| Ac.Powersolutions Ltd | Glasgow | 2025 |
| AC3D Bespoke Panelling Ltd | Tamworth | 2022 |
| ACA (Kent) Limited | New Romney | 2017 |
| ACA BRC Centre Ltd | Renfrew | 2020 |
| ACA Cabinetry & Joinery Limited | East Ham | 2015 |
| ACA Engineering Ltd | Wellingborough | 2025 |
| ACA Mechanical Ltd | Maidstone | 2024 |
| ACA Scotland Ltd | Inchinnan | 2013 |
| ACA Services (EA) Ltd | Norfolk | 2011 |
| ACA Valets&Tyres Ltd | Bolton | 2026 |
| ACA Windows Limited | Sheffield | 2006 |
| Aca-Apex Limited | Dunstable | 2000 |
| Acacia Graphix Limited | Leicester | 2016 |
| Acacia Green Technologies Ltd. | London | 2012 |
| Acacia Raddiana Limited | Hornchurch | 2025 |
| Acaciatastefully Ltd | Swansea | 2019 |
| Acaciawood Limited | Leeds | 2012 |
| Academy Engineering Limited | Marlborough | 1999 |
| Academy Fabrics Limited | Southall | 1996 |
| Academy for Future Health Ltd | London | 2020 |
| Academy for International Education and Research Limited | Luton | 2019 |
| Academy Hair and Beauty (UK) Ltd | Thornton Heath | 1997 |
| Academy Interiors Limited | Droylsden | 2008 |
| Academy Kits Limited | Wolverhampton | 2023 |
| Academy Lifts Limited | Warrington | 2002 |
| Academy of Clinical Mastery Limited | Thetford | 2024 |
| Academy of Friends CIC | Barnsley | 2024 |
| Academy of Homeopathy & Holistic Therapies-(A.H.H.T). Ltd | Birmingham | 2025 |
| Academy Print & Design UK Ltd | Accrington | 1996 |
| Academy Refrigeration Ltd | North Shields | 2014 |
| Academy Signs Holdings Limited | Birmingham | 1995 |
| Academy Signs Limited | Birmingham | 1992 |
| Academy Systems (UK) Ltd. | Newark | 2000 |
| Acadia Timber Limited | Hampshire | 2000 |
| Acadian Engineering Limited | Central | 1994 |
| Acai Outdoorwear Ltd | Deeside | 2016 |
| Acalor Protective Materials Limited | Royal Victoria Docks | 2009 |
| Acam Instrumentation Limited | | 1981 |
| Acam Music Limited | | 2007 |
| Acam Technology Limited | Derby | 1997 |
| Acamar Records Limited | Bristol | 2017 |
| Acaml Ltd | Newport | 2026 |
| Acana Limited | Gerrards Cross | 2008 |
| Acandis UK Limited | York | 2022 |
| Acaninternational Ltd | Wolverhampton | 2025 |
| Acante Solutions Limited | London | 2013 |
| Acantecs Limited | Sheffield | 2022 |
| Acanthus Cast Stone Limited | Alfreton | 2006 |
| Acanthus Craft Ltd | Salford | 2024 |
| Acanthus Design Ltd | Burnley | 2013 |
| Acanthus Press Limited | Cannock | 1990 |
| Acar (Realisations) Limited | Newcastle Under Lyme | 1966 |
| Acare Services Limited | Dereham | 2002 |
| Acarix Ltd | Stockport | 2021 |
| Acarrier Limited | Bradford | 2018 |
| Acas Engineering Ltd | Preston | 2015 |