| A B C Design & Print Limited | Doncaster | 2003 |
| A B C Domestic Repairs Limited | Merthyr Tydfil | 2002 |
| A B Caldwell Ltd | Maybole | 2011 |
| A B Catering Maintenance Limited | Glasgow | 2007 |
| A B Catering Services Limited | Cardiff | 2018 |
| A B Creative Designs Ltd | Melton Constable | 2013 |
| A B Fine Art Foundry Limited | London | 1992 |
| A B Fire and Lighting Ltd | Wolverhampton | 2021 |
| A B Glass (Doors & Windows) Limited | Cardiff | 2001 |
| A B Graphic International Limited | Staffordshire | 1954 |
| A B H (1994) Limited | | 1961 |
| A B Kerr Ltd | Cardigan | 2004 |
| A B Lewis Limited | Liverpool | 2006 |
| A B Linear Services Limited | Barnstaple | 2003 |
| A B Print Group Limited | West Yorkshire | 1970 |
| A B S Hovercraft Limited | Eastleigh | 1993 |
| A B Turnkey Solutions for Manufacturing Limited | Milton Keynes | 2001 |
| A B W Engineering Services (South West) Ltd | Wotton-Under-Edge | 2009 |
| A B Windows & Joinery Limited | Lancashire | 2003 |
| A Baker Wind Consultancy Ltd | Newport | 2023 |
| A Baker's Confession Ltd | London | 2023 |
| A Bare C Ltd | Canterbury | 2025 |
| A Barkers Fermenting Ltd | Blandford Forum | 2020 |
| A Barraclough Limited | Sheffield | 2011 |
| A Beauty Inc Ltd | Salford | 2024 |
| A Bennett Electrical (Norfolk) Ltd | Norwich | 2025 |
| A Better Life Limited | London | 2009 |
| A Bevan & SON Limited | Ilford | 2012 |
| A Billion Purple Co. Limited | York | 2025 |
| A Bizarre Obsession Limited | Henley In Arden | 2015 |
| A Block Limited | Bolton | 2016 |
| A Box & Beyond Ltd | Wigan | 2021 |
| A Brookes Limited | London | 2024 |
| A Bunch of Numbers Ltd | Thames Ditton | 2023 |
| A Buxton Limited | Bicester | 2002 |
| A C (UK) Engineering Limited | Bury St Edmunds | 2014 |
| A C Agricultural Solutions Ltd | Beverley | 2022 |
| A C Aviation Ltd | Porthcawl | 2024 |
| A C Blasting Services Limited | Pevensey Bay | 2018 |
| A C Cossor & SON (Technology) Ltd | Buntingford | 2017 |
| A C Direct Limited | London | 1992 |
| A C E Marquetry Limited | Marlborough | 2010 |
| A C Elevators Ltd | Sheffield | 2016 |
| A C Engineers Limited | Kington | 2014 |
| A C Haines Engineering Ltd | Plymouth | 2002 |
| A C Jackson Ltd | Tarporley | 2012 |
| A C Jenner & SON Ltd | Birmingham | 2002 |
| A C K Aviation Limited | Crawley | 2013 |
| A C Pavings Co Limited | Retford | 2000 |
| A C Pilmer Automatic Music Ltd | Huddersfield | 1986 |
| A C Powder Coatings Ltd | Yeovil | 2023 |
| A C Precision Limited | Gloucester | 2007 |
| A C Price (Engineering) Limited | Carnforth | 1994 |
| A C Products and Holdings Limited | Bedlington | 2025 |
| A C S Automation & Control Services Limited | Burton-On-Trent | 2008 |
| A C Safety Engineering Ltd | Doncaster | 2015 |
| A C Solutions Leicester Ltd | Leicester | 2009 |
| A C Steels Ltd | Bloxwich | 2008 |
| A C Stone & Ceramics Limited | Staines | 2018 |
| A C Systems (AV) Limited | Colne | 2015 |
| A Cameron (Bookbinders) Ltd | Glasgow | 2009 |
| A Car Repair EU Ltd | Peterborough | 2022 |
| A Carter Agricultural Services Limited | Church Stretton | 2014 |
| A Carter Construction Ltd | Egham | 2019 |
| A Catalyst Ltd | Uxbridge | 2025 |
| A City Limited | Belfast | 2023 |
| A Class Kitchen & Bedroom Ltd | Hayes | 2021 |
| A Class Products Ltd | Frome | 2013 |
| A Class Prototype Ltd | Nuneaton | 2021 |
| A Class Saddlery Ltd | Loanhead | 2025 |
| A Clubb Rail Limited | Canterbury | 2016 |
| A Cohen Trading Ltd | Longfield | 2023 |
| A Commercial Catering Equipment & Bars Company London Limited | London | 2004 |
| A Conscious Interruption Limited | London | 2021 |
| A Consultants Limited | Birmingham | 2014 |
| A Cooper Brickwork Ltd | Mexborough | 2019 |
| A Cordery (Cars) Limited | Hook | 2013 |
| A Craig Electrical Ltd | Kinross | 2014 |
| A Creative COG Ltd | London | 2018 |
| A Crosby Ltd | Liverpool | 2025 |
| A CUP Full Ltd | Walsall | 2024 |
| A Curious Enterprise Ltd | Hyde | 2021 |
| A CUT Above Merch and Uniform Limited | London | 2025 |
| A Cuthill Glazing Limited | Edinburgh | 2003 |
| A D a Machining Services Limited | Sheffield | 2003 |
| A D Burs Limited | Gloucester | 1995 |
| A D Engineering Services Ltd | Kegworth | 2007 |
| A D Ingram Carpentry & Joinery Limited | Kettering | 2014 |
| A D J Doors Limited | Lytham St Annes | 2009 |
| A D Lim-Lo Limited | London | 2011 |
| A D Machine Tool Maintenance Ltd | Lichfield | 2024 |
| A D Metal Spinning (Halifax) Limited | Leeds | 2004 |
| A D Metcalfe (Services) Limited | Ebbw Vale | 2009 |
| A D Mitchell Electrical Contractors Ltd | Colchester | 2013 |
| A D Plastic Solutions Limited | Maidstone | 2006 |
| A D Precision Engineering Limited | Newport | 1998 |
| A D Reffold (Electrical) Limited | Hull | 1976 |
| A D S Print Services Limited | Sidcup | 2012 |
| A D Stairs Limited | Rochdale | 2006 |
| A D Swindon Jewellers Limited | Middlesex | 2006 |