| BAU Panel Systems Limited | London | 2017 |
| Bauer Inc Ltd | Torquay | 2023 |
| Bauer International Ltd | Cardiff | 2018 |
| Bauhinia Manor Limited | Cardiff | 2021 |
| Baum Group Limited | Bury | 2003 |
| Baum Home Limited | Bury | 2014 |
| Baumtex Limited | Bury | 2003 |
| Bavan Investment Limited | London | 2022 |
| Bavanar Limited | Gateshead | 1981 |
| Bavaria Holiday Corporation Ltd | London | 2016 |
| Bavaria Limited | Manchester | 2017 |
| Bavaria Nett Ltd | London | 2024 |
| Bavarian Wizards Ltd | Maidstone | 2023 |
| Baverstocks AI Limited | Witham | 2023 |
| Baveystock Holdings Limited | London | 1931 |
| Bavin Bavin & Conrad Management Ltd. | Hadlow | 2010 |
| Bavin Technology Co., Ltd | Beckenham | 2024 |
| Bavington Limited | Washington | 1996 |
| Bavrock Ltd | Greenford | 2023 |
| Bawdon Lodge Farm Limited | Loughborough | 2015 |
| Bawnmore Court Management Limited | Coleraine | 1991 |
| Bawtry Gardens (Portman Court) Limited | Doncaster | 1998 |
| Bawtry Park Ltd | Barnsley | 2016 |
| Bawtry Road Access Agreement Company Limited | Doncaster | 2013 |
| BAXCO1211 Limited | Huddersfield | 2011 |
| Baxendale Limited | Edinburgh | 2013 |
| Baxifu (Netherlands) Int'L Agrochemistry Special Fertilizer Ltd | Kington | 2025 |
| Baxter & Bloom Ltd | Kingswinford | 2024 |
| Baxter Crushers Limited | Bishop Auckland | 1992 |
| Baxter Developments (Kent) Limited | Birchington | 2021 |
| Baxter Media Ltd | Beverley | 2019 |
| Baxtermead (Northern) Limited | Essex | 2004 |
| Baxton Management Limited | London | 2018 |
| Bay 5 Limited | Barry | 2025 |
| Bay Air Ltd | Ulverston | 2023 |
| Bay Cars Limited | Llantwit Major | 2006 |
| Bay Farm Foods Ltd | Derby | 2020 |
| Bay Film Studios Ltd | Swansea | 2015 |
| Bay Hotel (Scarborough) Ltd | London | 2021 |
| Bay Hotels Ltd | London | 2021 |
| Bay Marine Ltd | London | 2022 |
| Bay Pointe (Cardiff) Limited | London | 2014 |
| Bay Tree Atlanta GP Co Limited | London | 2019 |
| Bay Tree Homes Developments Ltd | Canterbury | 2015 |
| Bay Tree Ventures Limited | Bishops Stortford | 2025 |
| Bay VET Group Limited | Dawlish | 2016 |
| Bay View Heights Ltd | Crayford | 2013 |
| Bay View Preservation Limited | Grange-Over-Sands | 2009 |
| Bay-Anka Yachting Ltd | London | 2025 |
| Bay-Route Music Ltd | Burntwood | 2013 |
| Bay:K Limited | Bridgend | 2022 |
| Bayan Books Limited | Oxford | 2015 |
| Bayani Finance Limited | Preston | 2021 |
| Bayberry College Limited | Weston-Super-Mare | 2013 |
| Baybers Associates Ltd | London | 2006 |
| Baydale Croft (Management) NO.2 Limited | Darlington | 2000 |
| Baydean Limited | Bridgend | 2024 |
| Bayer & Norton Business Consultant Ltd | London | 2011 |
| Bayern Consultants Ltd | Chelmsford | 2004 |
| Bayfields (Horsforth) Dormant Limited | Shipley | 2013 |
| Bayfleet Limited | Greenock | 2010 |
| Bayford OIL Limited | Warrington | 1937 |
| Bayford Systems Limited | Bridgwater | 2013 |
| Baygar Ltd | Harrow | 2024 |
| Baygate Limited | London | 2012 |
| Bayhead Apartments Limited | Portstewart | 1994 |
| Baykan Yachting Limited | London | 2025 |
| Baylands Management Company Limited | Bangor | 2000 |
| Bayleaf Textile Limited | Newport | 2018 |
| Baylinks Limited | Derbyshire | 1989 |
| Baylis Holdings Limited | Waterlooville | 2016 |
| Bayliss Autovents Limited | Ashbourne | 1976 |
| Bayliss Properties (Deal) Limited | Dover | 2011 |
| Bayram Consulting Ltd | London | 2020 |
| Bayreal Limited | Macclesfield | 2025 |
| Bayrise Limited | London | 2019 |
| Bayrock Projects Limited | Wantage | 2016 |
| Bayshore Colt Limited | York | 2026 |
| Bayshore Nominees Limited | Henley-In-Arden | 2012 |
| Baysoom Industry & Trading Co., Ltd. | Beckenham | 2019 |
| Bayview (Bridlington) Management Company Limited | Bridlington | 2016 |
| Bayview Hotel (N.I.) Limited | Portballintrae | 1991 |
| Baywatch Limited | Southampton | 1996 |
| Baywatch Parking Limited | London | 2006 |
| BAZ Creative Limited | Carmarthen | 2010 |
| Bazinga Ltd | Harrogate | 2012 |
| Bazzi Limited | Hayes | 2025 |
| BB Daycare Ltd | Sheffield | 2015 |
| BB Education Limited | East Ham | 2009 |
| BB Facades Limited | High Wycombe | 2020 |
| BB Farm Investments Limited | London | 2023 |
| BB Finance Limited | Norwich | 2005 |
| BB Group of Companies Ltd | Huddersfield | 2024 |
| BB Logistics (London) Limited | Slough | 2005 |
| BB Lorry Wash Limited | London | 2025 |
| BB Online Asset Management Limited | Luton | 2005 |
| BB Partnership Trustee Limited | London | 2016 |
| BB Risk Services Limited | Norwich | 2011 |
| BB Skips Ltd | Burnley | 2019 |
| BB Woodland Limited | Bonnybridge | 2023 |