| B-Gone Laser Removal Ltd | Tamworth | 2022 |
| B-K9 Ltd | Kibworth Harcourt | 2025 |
| B-Laundry Limited | Walsall | 2023 |
| B-Lessed Studio Ltd | London | 2020 |
| B-Locz Ltd | Harlesden | 2020 |
| B-Network London Ltd | London | 2018 |
| B-Nile Limited | Leicester | 2024 |
| B-One Aesthetics Limited | Northampton | 2024 |
| B-Safe Fire Protection Ltd | Plymouth | 2023 |
| B-Spoke Property & Finance Ltd | Stirling | 2011 |
| B-Sure Recycling Ltd | Leicester | 2023 |
| B-Sure Security Services Limited | Nottingham | 2014 |
| B-Unique Beauty and Aesthetics Limited | Salisbury | 2020 |
| B. & C. Music Publishing Limited | Milton Keynes | 1994 |
| B. & H. Shipping Limited | Felixstowe | 1982 |
| B. Aesthetically Pleasing Ltd | Rochdale | 2019 |
| B. B. E. (UK) Ltd | London | 2009 |
| B. Beauty Bloom Ltd | Altrincham | 2025 |
| B. DYE Driving Services Limited | Loughton | 2017 |
| B. Grewal Limited | Guildford | 2016 |
| B. Livesey Limited | Chorley | 1934 |
| B. Luxe Beauty Limited | Glasgow | 2022 |
| B. Murray Limited | Kelso | 2019 |
| B. Reformer Pilates Ltd | Southampton | 2024 |
| B. Sweet & Sons Limited | Tewkesbury | 2005 |
| B.A. Creative Limited | Mansfield | 2025 |
| B.A. Supplies & Services Limited | Kent | 1998 |
| B.A.C Cleaning (Cheshire) Limited | Cardiff | 2015 |
| B.A.C Commercial (Cheshire) Limited | Corwen | 2015 |
| B.A.C.A. International UK Limited | Sheffield | 2016 |
| B.A.D INK Ltd | Wigan | 2025 |
| B.A.D Investors Limited | Horsham | 2022 |
| B.A.L.P.A. Custodian Trustees Limited | West Drayton | 1988 |
| B.A.R.K Consultancy Limited | Bromley | 2024 |
| B.A.S Bespoke Aesthetics Limited | Peterborough | 2022 |
| B.A.T.L. Ltd | Stockport | 2020 |
| B.A.T.Music Limited | Dundee | 1976 |
| B.A.W.L. Associates Ltd | Nottingham | 2024 |
| B.B. Appliances Ltd | Leigh-On-Sea | 2014 |
| B.B.S (SCO) Ltd | Hamilton | 2016 |
| B.Beautiful Bristol Limited | Bristol | 2014 |
| B.Bellabeauty Ltd | London | 2021 |
| B.Bellaromme Ltd | London | 2026 |
| B.C.N Enterprises Ltd | Manchester | 2017 |
| B.D.Dews Consulting Limited | Farnham | 2012 |
| B.D.S. (123) Limited | Walsall | 2022 |
| B.E Chairs Limited | Telford | 2022 |
| B.E. Drylining Limited | West Wickham | 2016 |
| B.E.S. (Ramsey) Limited | Huntingdon | 2004 |
| B.E.W.H. Pension Trustee Limited | Willennhall | 2013 |
| B.Gibbs Funeral Services Limited | Chard | 2011 |
| B.Hattersley & Sons,Limited | Derby | 1946 |
| B.Horus Ltd | London | 2020 |
| B.Hunt.Coaching Ltd | Nottingham | 2023 |
| B.I.S Motors Limited | Wolverhampton | 2016 |
| B.J. Kennels & Cattery Limited | Gloucester | 2010 |
| B.J. Meats Limited | Leigh On Sea | 2002 |
| B.J.A Cleaning Services Limited | Cheshunt | 2012 |
| B.J.Rock Limited | Bury St Edmunds | 1959 |
| B.Jeal Contracting Ltd | Wadebridge | 2023 |
| B.K. Financial Services Ltd | Manchester | 1997 |
| B.L. Acoustics Limited | Chelmsford | 1998 |
| B.L. Caravan Storage Limited | Kettering | 2000 |
| B.L.A. Computer Solutions Limited | Wolverhampton | 1996 |
| B.L.I.S.S. Residential Care Ltd | Banstead | 2007 |
| B.L.I.S.S. Support Services II Ltd | Banstead | 2026 |
| B.L.I.S.S. Support Services Ltd | Banstead | 2018 |
| B.L.P.Cyp Limited | Cleckheaton | 2025 |
| B.Luban Hair Ltd | London | 2020 |
| B.M. Car Parks Limited | Leeds | 2009 |
| B.M.A Associates Ltd | Enfield | 2005 |
| B.M.A Hair Design Ltd | Leeds | 2012 |
| B.M.B Tech Ltd | Birmingham | 2017 |
| B.M.V Alround Holding Limited | Hythe | 2025 |
| B.M.V Alround Limited | Hythe | 2025 |
| B.Mane Ltd | Romford | 2026 |
| B.Morley Hair and Beauty Ltd | Gerrards Cross | 2025 |
| B.N Services (Bristol) Ltd | Radstock | 2011 |
| B.O.B Salons Ltd | Bracknell | 2012 |
| B.O.G.O.F. Limited | Borehamwood | 2009 |
| B.P. Doran Holdings Limited | London | 2004 |
| B.P.B. Services Ltd | Brixham | 2019 |
| B.R. Project Limited | Helmsley | 2013 |
| B.R.H. & C.O. Limited | Hayes | 2019 |
| B.R.J. Commercial Accessories Limited | Renwick Road,Barking | 1983 |
| B.R.Training Ltd | Peterhead | 2009 |
| B.R.Wanstead Ltd | London | 2022 |
| B.S Barbers L1 Ltd | Liverpool | 2025 |
| B.S. Electrical (UK) Ltd | Wirral | 2006 |
| B.S. Midlands Limited | Brierley Hill | 2011 |
| B.S.A. Front Wheel Drive Club | Kenilworth | 1996 |
| B.S.C.A.H. | Rochdale | 2004 |
| B.S.W. Marquees Limited | Braintree | 1990 |
| B.T Locksmith Services Limited | Bexley | 2019 |
| B.T. & L. Stephens Ltd. | Chatham, Kent | 1999 |
| B.T. Hollington Limited | Ongar | 1982 |
| B.T.A.N Chelsfield Ltd | Orpington | 2023 |
| B.U Skincare Ltd | London | 2021 |
| B.U Studio Aesthetics Limited | Milton Keynes | 2026 |
| B.V Barbers Ltd. | London | 2018 |