| A B Creativity Ltd | Stalybridge | 2021 |
| A B Demolition (SW) Limited | Newport | 1997 |
| A B DEV Assets Limited | Wimborne | 2022 |
| A B DEV Ltd | Wimborne | 2020 |
| A B DEV Technology Limited | Wimborne | 2022 |
| A B Ecology Services ( Lincs.) Ltd | Grimsby | 2025 |
| A B F Enterprise Ltd | Romford | 2017 |
| A B Fabritech Limited | Bradford | 2010 |
| A B G Accountancy 2018 Ltd | Weybridge | 2018 |
| A B Hemmons Ltd | London | 2022 |
| A B I Design Partnership Limited | Leeds | 2012 |
| A B I R Architects Limited | Worthing | 2009 |
| A B Little Holdings Ltd | Manchester | 2014 |
| A B M Consultancy Services Limited | Peterborough | 2005 |
| A B Moug Limited | Shipston-On-Stour | 2017 |
| A B Outhwaite Ltd | Warrington | 2021 |
| A B Outsourcing Limited | Leeds | 1997 |
| A B Owen Limited | Brierley Hill | 2003 |
| A B P Legal Limited | Gillingham | 2025 |
| A B Properties M/C Ltd | Salford | 2006 |
| A B Property Consultancy Limited | Liverpool | 2018 |
| A B Recycling Services Ltd | West Bromwich | 2016 |
| A B Safety Limited | Newry | 2022 |
| A B SEE Solutions Ltd | Hartlepool | 2019 |
| A B Services (Bolton) Ltd | Bolton | 2024 |
| A B Services (Chesterfield) Limited | Chesterfield | 2007 |
| A B Smith (Consultancy) Limited | Scotland | 2005 |
| A B Still Limited | High Wycombe | 2003 |
| A B Sturman Consultancy Limited | Billericay | 2021 |
| A B Swansea Limited | Swansea | 2013 |
| A B T Associates Ltd | Banbury | 2007 |
| A B Transport Compliance Services Ltd | Southend-On-Sea | 2026 |
| A B U International Limited | Longfield | 2019 |
| A B Ventures (Fmcg) Ltd | Droitwich | 2024 |
| A Bailey Ltd | Billericay | 2025 |
| A Bajrangee Limited | Rickmansworth | 2019 |
| A Baker Films Ltd | Hutton, Brentwood. | 2023 |
| A Balanced Approach Limited | New Milton | 2023 |
| A Balanced Life Limited | Loughton | 2023 |
| A Balfour Engineering Services Ltd | Carlisle | 2022 |
| A Bamford Trading Company Ltd. | Uttoxeter | 1990 |
| A Bankethomas Ltd | Stafford | 2019 |
| A Barclay Engineering Services Ltd | Westhill | 2024 |
| A Barker Design Ltd | Exeter | 2023 |
| A Barlow Bookkeeping Limited | Marlborough | 2008 |
| A Barnes Consultancy Ltd | Crawley Down | 2018 |
| A Barnes Solutions Ltd | Cheshire | 2023 |
| A Barth Limited | 3 Dorset Rise | 1997 |
| A Bartlett Associate Ltd | Manchester | 2023 |
| A Bartlett Limited | Airdrie | 2014 |
| A Batchelor Consulting Limited | Altrincham | 2015 |
| A Bautista Consulting Limited | 42 White Horse Lane | 2026 |
| A Bayton Limited | Norwich | 2010 |
| A Beales Consulting Limited | Reigate | 2019 |
| A Beer in Paris Limited | London | 2023 |
| A Benn Ltd | Liversedge | 2012 |
| A Berey Company Ltd | Abertawe | 2026 |
| A Berry Engineering Ltd | Burnley | 2023 |
| A Berryman Ltd | London | 2022 |
| A Besley Consulting Ltd | Sherborne | 2024 |
| A Bespoke Consultancy Ltd | Bristol | 2022 |
| A Better Company Ltd | Ingatestone | 2025 |
| A Better Good Ltd | London | 2013 |
| A Better Place Limited | Lytham St.Annes | 2020 |
| A Better Planet Community Interest Company | Liverpool | 2023 |
| A Better Way Consulting Ltd | Aylesbury | 2021 |
| A Better Way Global Ltd | Reading | 2014 |
| A Better Way Ltd. | Troon | 2007 |
| A Bianco Ltd | Woking | 2022 |
| A Bickerstaffe Ltd | Beverley | 2023 |
| A Big JAY Limited | Peterborough | 2016 |
| A Bigger Picture Solutions Limited | Kingston Upon Thames | 2021 |
| A Bigger Splash Limited | Stanmore | 2004 |
| A BIO Limited | Cambridge | 2021 |
| A Biotech Company Limited | London | 2022 |
| A Bird's EYE View Limited | Richmond | 2014 |
| A BIT of DIS N DAT Ltd | London | 2025 |
| A BIT Weird C.I.C. | Rochdale | 2024 |
| A Black History of Art Limited | London | 2024 |
| A Black LIE Limited | London | 2013 |
| A Blackwood Limited | Cardiff | 2014 |
| A Blank Slate Design Ltd | Tadley | 2022 |
| A Bloc Ltd | London | 2026 |
| A Bloch Holdings Ltd | London | 2021 |
| A Boake Roberts and Company (Holding) Limited | Suffolk | 1897 |
| A Boniface Limited | Yateley | 2012 |
| A Bowyer Accounting Ltd | Orpington | 2025 |
| A Box of Tricks Ltd | Salisbury | 2013 |
| A Brady Consulting Limited | Sleaford | 2020 |
| A Branch & Co. Ltd | London | 2025 |
| A Brand New Agency Limited | Wirral | 2014 |
| A Brand New Start Limited | St Albans | 2009 |
| A Branigan Consulting Limited | Oxford | 2014 |
| A Breath of Oxygen Limited | Bristol | 2025 |
| A Breen Medical Services Limited | Wetherby | 2015 |
| A Bridge TOO FAR Limited | Altrincham | 2007 |
| A Bridging Lender Ltd | Bury St. Edmunds | 2025 |
| A Brighter Day Limited | St Osyth | 2023 |
| A Brilliant Thing Community Interest Company | Bury | 2022 |
| A Brinklow Consulting Ltd | Derby | 2024 |