| A T Aviation (Engineering) Limited | Bridgwater | 2018 |
| A T Centre Ltd | Dromore | 2023 |
| A T D Precision Engineering Ltd | Chesterfield | 2006 |
| A T Graphics (WY) Ltd | Halifax | 2016 |
| A T H Rubber Products Limited | Retford | 2015 |
| A T Hewitson Fabrication Limited | Bradford | 2003 |
| A T Leads & Looms Limited | Walsall | 2005 |
| A T Marshall Joinery Limited | Hunters Quay | 2005 |
| A T Moores Electrical Contractors Limited | Sandbach | 2018 |
| A T Pipework Fabrication Ltd | Coleshill | 2020 |
| A T Plant Services Ltd | Warrington | 2003 |
| A T Promotions (Holdings) Limited | King'S Lynn | 2019 |
| A T Promotions Limited | Liverpool | 2006 |
| A T S Signs Limited | Leigh-On-Sea | 2006 |
| A T Sack Fillers Limited | Huntingdon | 2005 |
| A T SET & Stage Limited | York | 2002 |
| A Taste of Afrika Gourmet Ltd | Harold Hill | 2009 |
| A Taste of Afrikka Gourmet Ltd | Romford | 2025 |
| A Taste of Kiki’S Kitchen Ltd | London | 2024 |
| A Taste of Magic Ltd | Milton Keynes | 2026 |
| A Taste of Toll House Limited | Inverurie | 2026 |
| A Taylor Contracting Ltd | Oldbury | 2013 |
| A Team Cranes UK Ltd | Chesterfield | 2022 |
| A Team Fabrications Ltd | Cardiff | 2012 |
| A Tech Engineering Ltd | Woodhall Spa | 2024 |
| A Terrain Commercials Ltd | Knutsford | 2023 |
| A Thai Tale Limited | Bracknell | 2025 |
| A Thirsty Habit Ltd | Canterbury | 2020 |
| A Thompson JNR Limited | Strichen | 2014 |
| A to Z at Railway Ltd | Mitcham | 2023 |
| A to Z Catering Equipments Limited | Blackburn | 2021 |
| A to Z Designer Ltd | London | 2015 |
| A to Z Desserts Ltd | Whyteleafe | 2024 |
| A to Z Electrical Solutions Ltd | Southampton | 2022 |
| A to Z Fabrications Ltd | Morecambe | 2021 |
| A to Z Fabrications Specialist Ltd | West Bromwich | 2022 |
| A to Z Furnishings Ltd | London | 2021 |
| A to Z Garage Alloa Ltd | Alloa | 2026 |
| A to Z Garden Buildings Limited | Blackpool | 2024 |
| A to Z Kitchens Limited | Glasgow | 2021 |
| A to Z Manufacturing Group Ltd | Wigan | 2026 |
| A to Z Scenery Limited | Slough | 1998 |
| A to Z Seating Ltd | London | 2021 |
| A to Z Sofa Ltd | Sheffield | 2022 |
| A to Z Solutions for Trading UK Ltd | Newcastle Upon Tyne | 2022 |
| A to Z Tailoring & Alteration Ltd | Chesham | 2026 |
| A to Z Wood Flooring Limited | London | 2025 |
| A to Z Zenith Platform Limited | London | 2016 |
| A Touch of Frost Design Ltd | Aberdeen | 2025 |
| A Touch of Madness Ltd | Saffron Walden | 2024 |
| A Town Carpentry Ltd | Southampton | 2025 |
| A True Move Limited | London | 2021 |
| A Turner Autos Limited | Airdrie | 2014 |
| A V a Engineering Consultancy Ltd. | West Midlands | 2005 |
| A V E Holdings Limited | Stoke On Trent | 1995 |
| A V Injection Limited | Rainworth, Mansfield | 2004 |
| A V Matrix Ltd | Harrogate | 2003 |
| A V Optics Limited | Yeovil | 2005 |
| A V Products Limited | Wigston | 2013 |
| A V Racks Limited | Birmingham | 2005 |
| A V Thermoforming Limited | Royston | 2014 |
| A V W Controls Limited | Diss | 1998 |
| A Vida Fashion Limited | Reading | 2007 |
| A Voice Finishing Ltd | Solihull | 2018 |
| A W 2 Limited | Uxbridge | 1955 |
| A W Belting Services Limited | Leeds | 2023 |
| A W Borrett Agri Limited | Bury St. Edmunds | 2018 |
| A W Carpentry & Loft Conversions Ltd | Southampton | 2012 |
| A W Carpentry Southwest Limited | Bristol | 2015 |
| A W Control Systems Ltd | Armagh | 2007 |
| A W Grace & SON Limited | Culham | 1996 |
| A W Holdings 24 Limited | Sowerby Bridge | 2012 |
| A W Joinery (Bristol) Limited | Bristol | 2014 |
| A W Lift Services Ltd | Maidstone | 2016 |
| A W Rose Ltd | Birmingham | 2011 |
| A W S Tyres & SON Limited | Newark | 2003 |
| A W Services Devon Limited | Cullompton | 2017 |
| A W Specialist Joinery Limited | Hockley | 2007 |
| A W Steel Works Limited | Eastbourne | 2013 |
| A W Tools (Europe) Limited | Sheffield | 2006 |
| A W Wilson Metal Work and Training Limited | Larne | 2017 |
| A Watts Marine Electrical Limited | Southampton | 2025 |
| A Weathered Penny Limited | London | 2015 |
| A Weld (Bristol) Limited | Shepton Mallet | 2009 |
| A Widows Cauldren Ltd | Wolverhampton | 2024 |
| A Wing & a Prayer Limited | Rutland | 1994 |
| A Wings Ltd | Birmingham | 2025 |
| A Woodcock and Sons Limited | Wigston | 2003 |
| A Woods Agricultural Limited | Spalding | 2016 |
| A Wrate Engineering (Southern) Ltd | New Milton | 2021 |
| A Wrate Engineering Ltd | Sunbury-On-Thames | 2019 |
| A Wright Building Developments Ltd | Nottingham | 2026 |
| A Wyrd Company Ltd | Crayford | 2025 |
| A Y D Limited | St Asaph | 2005 |
| A Yarn From North Ronaldsay Limited | Orkney | 1996 |
| A&A Adagha Ltd | London | 2024 |
| A&A Automation Limited | Liverpool | 2024 |
| A&A Builds Ltd | London | 2023 |
| A&A Butcher Ltd | London | 2019 |
| A&A Halal Foods Ltd | Shadwell | 2026 |