| Bankfield Property Services Ltd | Holmfirth | 2021 |
| Bankhead Developments Ltd | Limekilnburn | 2022 |
| Bankhead Grove Residents Limited | South Queensferry | 2014 |
| Bankmile Limited | Penzance | 1950 |
| Banknet Ltd | London | 2006 |
| Banks Funeral Service Limited | Sutton Coldfield | 1973 |
| Banks Truck Centre Limited | Sandy | 1981 |
| Bankside Law Limited | Brighton | 2001 |
| Bankwood Holdings Ltd | Doncaster | 2019 |
| Bankwood Kennels and Cattery Limited | Pontefract | 2018 |
| Banmore Limited | London | 1998 |
| Bann Contracts Ltd | Co Armagh | 2003 |
| Bannatyne Fitness (6) Limited | Darlington | 1995 |
| Bannatyne Fitness (7) Limited | Darlington | 1990 |
| Bannatyne Fitness (8) Limited | Darlington | 1993 |
| Bannatyne's Health Club (Blackpool) Ltd | Darlington | 2000 |
| Bannatyne's Health Club (Falkirk) Limited | Darlington | 1998 |
| Bannatyne's Health Club (Fife) Limited | Darlington | 1998 |
| Bannatyne's Health Club (Tower 42) Ltd | Darlington | 2003 |
| Bannatyne's Health Club Limited | Darlington | 1998 |
| Banner Box Limited | Staveley | 1997 |
| Banner Homes Limited | Staines Upon Thames | 1978 |
| Bannister Transport Limited | Evesham | 2025 |
| Bannockburn Highland Lodges Ltd | Glasgow | 2010 |
| Bannor Industrial Co., Ltd | Kington | 2014 |
| Bansal Properties Limited | London | 2014 |
| Bansda Industrial Ltd | Beckenham | 2024 |
| Banshee Products Ltd | Burnley | 2021 |
| Banshee's Cottage Limited | Warrington | 2014 |
| Bansi Trading Limited | Bromsgrove | 2021 |
| Bansols 121 Limited | Banbury | 2019 |
| Bansols 124 Limited | Banbury | 2024 |
| Bansols Directors Limited | Banbury | 1997 |
| Bansols Sixty-Two Limited | Banbury | 2012 |
| Bansun (UK) International United Group Co., Limited | Kenilworth | 2019 |
| Banta TV Limited | London | 2009 |
| Bantam Properties Ltd | Bradford | 2018 |
| Banties Ltd | Banbridge | 2012 |
| Banwell Garage Limited | Bristol | 2006 |
| Banwy GAS and Biomass Limited | Welshpool | 2021 |
| Banx Ltd | Doncaster | 2026 |
| Banxia Holdings Limited | Kendal | 1998 |
| BAO Contracts Ltd | Doncaster | 2020 |
| BAO HUI FA Steel Intl Trade Co., Ltd | Beckenham | 2024 |
| BAO Run Feng Intl Trade Co., Ltd | Beckenham | 2023 |
| Baobab Group Limited | Buckingham | 2022 |
| Baobab Physical Commodities Limited | London | 2024 |
| Baobo International Trading Limited | Cambridge | 2023 |
| Baochem Industries Limited | Cambridge | 2011 |
| Baodel Electric System Co., Ltd | Cambridge | 2021 |
| Baogang (Shandong) Iron and Steel Co., Ltd | Beckenham | 2022 |
| Baogu Steel Co., Ltd | Kenilworth | 2018 |
| Baoi Ltd | Sheffield | 2023 |
| Baolongda Forging International Co., Ltd | London | 2017 |
| Baoodio Trading Co Ltd | Beckenham | 2023 |
| Baoshijie Group Share Limited | Beckenham | 2024 |
| BAP Bros Ltd | Leicester | 2025 |
| Baps (UK) Limited | London | 2002 |
| Baps Care Limited | London | 2002 |
| Baps Charities | London | 2008 |
| Baps International Limited | London | 2002 |
| Baps Swaminarayan Herbal Care Limited | London | 2002 |
| Baps Swaminarayan Sanstha Limited | London | 2002 |
| Baptist Insurance Services Limited | Gloucester | 2011 |
| Baput (Europe) Group Ltd | Beckenham | 2024 |
| Bar - COM (Inverness) Limited | | 2005 |
| Bar - TEC (Scotland) Limited | | 2004 |
| Bar 1 Gorleston Ltd | Great Yarmouth | 2024 |
| Bar 147 Limited | Sawston | 2011 |
| Bar Control Valves Limited | London | 2016 |
| Bar Gurus Events Services Limited | Witney | 2025 |
| Bar Skins Ltd | Folkestone | 2023 |
| Bar Stuff Limited | Banbury | 2003 |
| Bar Technologies Ltd | Folkestone | 2013 |
| BAR2.0 Ltd | Manchester | 2010 |
| Barabati Ltd | London | 2013 |
| Barahp Ltd | Coventry | 2016 |
| Baraine Limited | Loughborough | 2012 |
| Baraka Textiles Limited | Blackburn | 1999 |
| Barakat Global Limited | Cambridge | 2017 |
| Barakat Trading Limited | London | 2025 |
| Barakh International Trade Co., Ltd | London | 2024 |
| Baranite Construction Equipment Limited | Shoreham By Sea | 2010 |
| Barans Marine Limited | London | 2025 |
| Baravinna Corp Ltd | London | 2020 |
| Barbar Marine Limited | London | 2020 |
| Barbara Anne Bradbury Ltd | Wokingham | 2024 |
| Barbara Cares Ltd | London | 2022 |
| Barbara Danielle Antoniewicz Ltd | London | 2025 |
| Barbara Francis Ltd | Ilford | 2025 |
| Barbara Maternity-Child Commodity Limited | London | 2015 |
| Barbarian Fitness Ltd | Cardiff | 2021 |
| Barbell School Limited | Burnley | 2020 |
| Barbell Training Complex Ltd | Coventry | 2017 |
| Barber Harrison & Platt Limited | Sheffield | 2020 |
| Barber Osgerby Holdings Limited | London | 2025 |
| Barber Performance Engineering Ltd | City Oflondon | 2021 |
| Barbera Limited | Sale | 2017 |
| Barberry Homes Limited | Stourbridge | 1996 |
| Barberry Properties Limited | Stourbridge | 2009 |