| Bryant Maintenance Limited | Tipton | 2009 |
| Bryantel Ltd | London | 2018 |
| Bryants London Group Ltd | London | 2013 |
| Bryants London Ltd | London | 2013 |
| Bryants Property Ltd | London | 2013 |
| Bryants Property Management Ltd | London | 2013 |
| Bryants Residential Ltd | London | 2013 |
| Bryce Europe Limited | Hull | 2015 |
| Bryce Fuels Limited | Bathgate | 2014 |
| Bryer Estates Holdings Limited | Warwick | 2017 |
| Bryg Consulting Limited | Bournemouth | 2023 |
| Bryline Properties Ltd | Nottingham | 2024 |
| Brymill Limited | Oldbury | 1920 |
| Brymill Stockholders Limited | Mitcham | 1948 |
| Bryn Coch 23/12/66 Limited | Wrexham | 2014 |
| Bryn Cottages Ltd | Wolverhampton | 2022 |
| Bryn Helig (Deganwy) Limited | Benarth Road | 2013 |
| Bryn Quarry Limited | Newport | 1996 |
| Bryn Seiriol Flats Limited | | 1977 |
| Bryn Villa Farm Ltd | Pwllheli | 2016 |
| Brynawael 1964 Limited | Swansea | 2014 |
| Bryndale Strategic Ltd | Doncaster | 2026 |
| Brynglas 3 Ltd | Y Fenni | 2024 |
| Brynkinalt (Trevor) NO.1 Company Limited | Wrexham | 2023 |
| Brynkinalt (Trevor) NO.2 Company Limited | Wrexham | 2023 |
| Brynmara Holdings Limited | St Mellons | 2020 |
| Brynztax (Accountancy) Limited | Derby | 2017 |
| Bryson Windows & Doors Limited | Blackwood | 2020 |
| Bryton Properties Limited | London | 2022 |
| BRZ Builders Limited | Northwood, | 2011 |
| BS Advisory Limited | Dorking | 2017 |
| BS Marine Ltd | Bromley | 2025 |
| BS Service Invest Limited | Cardiff | 2022 |
| BS Service Sweden Limited | London | 2022 |
| BSA Corporation Limited | Chandlers Ford | 1986 |
| BSA Marketing Ltd | Glossop | 2021 |
| BSA Property Limited | London | 2006 |
| Bsac Ltd | Budleigh Salterton | 2020 |
| Bsaveholdings Ltd | Glasgow | 2022 |
| BSB 16 Limited | Birmingham | 2025 |
| BSB Holdings Limited | London | 2020 |
| BSC & SON Secretaries Limited | Rochester | 2008 |
| BSC Brands Holding Limited | London | 2017 |
| BSC Employees Trustees Limited | Barnet | 2025 |
| BSC Nominees Ltd | Staines-Upon-Thames | 2020 |
| Bsdna Ltd | Manchester | 2012 |
| BSE Management Services Ltd | Coventry | 2018 |
| BSF Animal Nutrition Co., Ltd. | Cardiff | 2018 |
| BSF Group Ltd | Barking | 2018 |
| BSF Timber Engineering Limited | Canterbury | 2014 |
| BSG Group Services Ltd | Southampton | 2015 |
| BSH Pension Trustee Limited | Gateshead | 1997 |
| Bshl Limited | Bradford | 2009 |
| BSI Care Ltd | Coventry | 2023 |
| Bsjk Properties Investments Ltd | Burnley | 2016 |
| BSL Bridge Ltd | Henley-In-Arden | 2015 |
| BSM Hage Service Invest Limited | London | 2025 |
| BSM Hage Service Limited | London | 2025 |
| BSM Metal & Rubbish Recycling Ltd | Waterlooville | 2015 |
| Bsmsr Limited | Manchester | 1992 |
| BSP Foodline Limited | London | 2015 |
| BSP Mezzanine Nominee Limited | London | 2005 |
| BSP Technology Ltd | Usk | 2012 |
| Bspm Limited | Bristol | 2003 |
| Bsrb Limited | Tonbridge | 2009 |
| BSS (UK) Limited | Northampton | 1957 |
| Bssl Management Limited | Co Armagh | 2008 |
| Bstartle Ltd | London | 2019 |
| Bster Ltd | Birmingham | 2024 |
| BSU Limited | Cheltenham | 2009 |
| BSW Developments Ltd | Witham | 2020 |
| BT Corporate Trustee Limited | London | 2013 |
| BT Group Nominees Limited | London | 1989 |
| BT Marine Ltd | London | 2025 |
| BT Nominees Limited | London | 1986 |
| BT Rolatruc Limited | Slough | 1979 |
| BTC Racing Limited | Brighton | 2021 |
| BTC Universal Ltd | London | 2021 |
| Btcx Investment Ltd | London | 2025 |
| BTD Healthcare Limited | Milton Keynes | 2022 |
| BTG Contractors Limited | Littleborough | 2020 |
| BTI Consulting Ltd | Haywards Heath | 2021 |
| BTL Experts Limited | London | 2025 |
| BTL Holdings Limited | Ulverston | 2016 |
| BTL Mortgage Ltd | London | 2022 |
| BTP Construction Management Limited | London | 2008 |
| BTR CA Limited | Basildon | 2019 |
| BTR Dean Beck Limited | Wetherby | 2019 |
| BTR Rodley Limited | Wetherby | 2021 |
| Btracts Limited | Spalding | 1997 |
| Btsl EOT Limited | Bury St. Edmunds | 2023 |
| BTW Tanker Rental Ltd | Langport | 2017 |
| BTY Ltd | Oldham | 2025 |
| BU Ltd | Saffron Walden | 2009 |
| BU Real Estate Ltd | Haverfordwest | 2024 |
| BU2FULL Ltd. | Manchester | 2026 |
| BUA Motorsport Ltd | Canterbury | 2025 |
| Bubble and Greek Limited | London | 2023 |
| Bubble Daisy London Limited | Leicester | 2020 |
| Bubble Gump Images Ltd | Manchester | 2016 |