| AB Vehicle Repairs Limited | Newcastle | 2016 |
| AB Welding Services Ltd | Southampton | 2020 |
| AB World Foods Limited | London | 1978 |
| AB Worx Limited | Battle | 2025 |
| AB Yours Limited | High Wycombe | 2010 |
| Ab&C Solutions Ltd | Washington | 2007 |
| Ab-Iv CIC | Birmingham | 2025 |
| Ab.Built Ltd | Lockerbie | 2025 |
| AB10 Consultancy Ltd | Bellshill | 2011 |
| AB10 Design Limited | Leicester | 2025 |
| AB15 Services Limited | Birmingham | 2014 |
| AB3D Designs Ltd | Walsall | 2022 |
| AB7 Global Limited | London | 2012 |
| AB8 Designs Ltd | Wigston | 2024 |
| ABA Construction (Essex) Ltd | Stanford Le Hope | 2017 |
| ABA Foods Limited | London | 2013 |
| Abaake by Equip Ltd | Manchester | 2023 |
| Abac Interiors Limited | London | 2013 |
| Abaca Ltd | Ammanford | 2001 |
| Abacas Studios Limited | Milton Keynes | 2009 |
| Abaco Systems Limited | Leicester | 1987 |
| Abaco Transport Limited | Southminster | 2017 |
| Abacus Blinds and Awnings (Southeast) Ltd | Maidstone | 2014 |
| Abacus Blinds Limited | Plymouth | 2006 |
| Abacus Cards Limited | Newmarket | 1991 |
| Abacus Cash Registers Limited | Sutton Coldfield | 1999 |
| Abacus Design and Fabrication Limited | Washington | 2002 |
| Abacus Design U.K. Limited | Stock | 2000 |
| Abacus Fabrications Ltd | Halifax | 2021 |
| Abacus Finch Ltd | Wakefield | 2021 |
| Abacus Gems Jewellery Limited | London | 2022 |
| Abacus Home Limited | High Wycombe | 2012 |
| Abacus Instruments Limited | Sandy | 2000 |
| Abacus Joinery Ltd | Bolton | 2020 |
| Abacus Lighting Limited | Sutton In Ashfield | 2013 |
| Abacus Plant and Materials Handlings Ltd. | Cheshire | 1999 |
| Abacus Print Limited | Loughton | 2004 |
| Abacus Printing Company Limited | London | 1969 |
| Abacus Restoration Ltd | London | 2024 |
| Abacus Shutters Ltd | Colchester | 1999 |
| Abacus Signs and Digital Limited | Glasgow | 2013 |
| Abacus Stone Sales Ltd | Holmfirth | 2024 |
| Abacus Tubular Products Limited | Ramsey Huntingdon | 1985 |
| Abacus Upholstery Limited | Stonehouse | 2021 |
| Abacus Valves International Limited | Alton | 2000 |
| Abacus Windows Commercial Limited | Chelmsford | 1998 |
| Abacus X Ltd | Leeds | 2019 |
| ABACUS6IX Limited | London | 2022 |
| Abad Designs Ltd | London | 2019 |
| Abalon Star Ltd | London | 2015 |
| Abalone Graphics Ltd | Stoke-On-Trent | 2010 |
| Abaloneuk Limited | London | 2016 |
| Abanaki (UK) Limited | Bristol | 2000 |
| Abaplas Materials Ltd | Loughborough | 2022 |
| Abaquip Limited | London | 1988 |
| Abar Studio Ltd | Wembley | 2025 |
| Abartech Limited | Prestatyn | 2012 |
| Abasyn Foods Ltd | Wimbledon | 2020 |
| Abatiko Limited | London | 2025 |
| Abatron Limited | Forres | 1979 |
| Abax UK Limited | Peterborough | 2011 |
| Abaya M & S Ltd. | London | 2025 |
| ABB Cable Management Products Limited | Warrington | 1960 |
| ABB E-Mobility UK Limited | Warrington | 2021 |
| ABB Fabs Ltd | Rushden | 2020 |
| ABB Installation Products Limited | Warrington | 1969 |
| ABB Limited | Warrington | 1999 |
| ABB Liveaboard Boats Limited | Woking | 2021 |
| ABB LOW Voltage Systems Limited | Lincoln Square | 1973 |
| ABB Power T&D Limited | Aberdeen | 1936 |
| ABB Robotics UK Limited | Warrington | 2025 |
| ABB Windows Ltd | Knutsford | 2016 |
| Abba Beel Private Limited Company | Manchester | 2003 |
| Abba Blinds Limited | Glasgow | 1984 |
| Abba Commercials ST Helens Ltd | St. Helens | 2013 |
| Abba Gate Limited | Dundee | 2016 |
| Abba Motorcycle Equipment UK Ltd | Chelmsford | 2015 |
| Abbacus Blinds Limited | Halifax | 2005 |
| Abbaltis Ltd | Sittingbourne | 2010 |
| Abbas Fida Husain UK Limited | London | 2020 |
| Abbas Shutters & Shopfronts Ltd | Bury | 2025 |
| Abbas Trading Co., Ltd | Cambridge | 2023 |
| Abbee Ltd. | Oxford | 2024 |
| Abbey (Southern) Ltd | Poole | 2003 |
| Abbey Ales Limited | Frome | 1997 |
| Abbey Alexander Media Ltd | London | 2011 |
| Abbey Antique & Furnishing Ltd | Romford | 1991 |
| Abbey Artstone Limited | Keighley | 2011 |
| Abbey Bach Engineering Services Ltd | St Asaph | 2012 |
| Abbey Bitters Limited | Jedburgh | 2026 |
| Abbey Blinds and Curtains Ltd | Coventry | 2024 |
| Abbey Blinds Limited | Walsall | 2012 |
| Abbey Carpentry & Construction Ltd | Plymouth | 2024 |
| Abbey Cast Stone Products Ltd | Denholme | 2014 |
| Abbey Concrete Limited | Freshwater Road Dagenham | 2003 |
| Abbey Contract Flooring Limited | Leeds | 1999 |
| Abbey Corinthian Games Company Ltd. | Fakenham | 1959 |
| Abbey County Limited | Radlett | 2023 |
| Abbey Craft Pool & Snooker Ltd | Newtownabbey | 2024 |
| Abbey Cross Trading Limited | Southend | 1974 |