| Baylis & Knight Ltd | Stockport | 2005 |
| Bayliss Group Electrics Limited | Alcester | 2014 |
| Bayliss Precision Components Limited | Ashbourne | 1969 |
| Bayliss Printing Company Limited | Rainworth, Mansfield | 1969 |
| Bayliss, Thomas & Co. Limited | Cardiff | 2020 |
| Baylock Ltd | Wigan | 2025 |
| Baymz Automotive Designs Ltd | Royal Victoria Docks | 2020 |
| Baynes Wipers Ltd | Southsea | 2026 |
| Baynhams Brewery Limited | Brockenhurst | 2017 |
| Baynton Fabrications Limited | Coventry | 2020 |
| Bayoak Limited | Birmingham | 1978 |
| Bayonet Brewing Ltd | Northallerton | 2024 |
| Bayprintni Ltd | Bangor | 2025 |
| Bayram Foods Ltd | Enfield | 2020 |
| Bayram Timber Limited | North Ferriby | 2000 |
| Bays Brewery Limited | Torquay | 2006 |
| Bays Sports Ltd | Cardiff | 2021 |
| Bayse Technology Co., Ltd | Beckenham | 2020 |
| Baysek Solutions Europe Ltd | Bristol | 2025 |
| Baysek Solutions UK Ltd | Bristol | 2025 |
| Bayside Dynamics Ltd | Paignton | 2018 |
| Bayside Engineering Ltd | Cardiff | 2000 |
| Bayt AL Reem Ltd | Birmingham | 2024 |
| Bayt AL Yemeni Bakery Ltd | England | 2024 |
| Bayta International Limited | West Midlands, England | 2024 |
| Baytek Office Solutions Limited | Torquay | 2008 |
| Baytons Bespoke Furniture Limited | Tamworth | 2021 |
| Baytracks Limited | Borehamwood | 2011 |
| Baytree & Mcqueen Limited | Newton Abbot | 2022 |
| Baytree Electrical Limited | Melton Mowbray | 2026 |
| Baytree Furniture Limited | Newark | 2017 |
| Baytree Joineries Limited | Stoke-On-Trent | 2017 |
| Baywa R.E. Operation Services Limited | Milton Keynes | 2014 |
| Baywifi (UK) Limited | Swansea | 2019 |
| Baywood Design Limited | Brighton | 2025 |
| BAZ & a Limited | High Wycombe | 2015 |
| BAZ Airsoft Ltd | Sheffield | 2023 |
| BAZ Subco 1 Ltd | London | 2024 |
| Baz-Roll International Limited | Calne | 2011 |
| Baz-Roll Products Limited | Calne | 1973 |
| Baza Bar & Grill Ltd | London | 2023 |
| Bazaar Electronics Ltd | Leicester | 2024 |
| Bazanela Ltd | Poole | 2022 |
| Bazor Services Ltd | Coventry | 2025 |
| Bazz Aerotech Limited | Cambridge | 2014 |
| Bazzar Print Solutions Limited | Braintree | 2019 |
| BB Agri Machinery Ltd | Bude | 2017 |
| BB Amplification Ltd | Witham | 2011 |
| BB Apron Ltd | London | 2025 |
| BB Bakery Ltd | London | 2026 |
| BB BEV UK Limited | London | 2022 |
| BB Cakes Ltd | Hemel Hempstead | 2015 |
| BB Camper Conversions Ltd | Brough | 2022 |
| BB Dollhouse Limited | Rochdale | 2025 |
| BB Engineering (NI) Limited | Coleraine | 2003 |
| BB EV Energy Solutions Ltd | Glasgow | 2019 |
| BB Exclusive Fabrications Ltd | Halifax | 2018 |
| BB Fabrication Contracts Ltd | Glasgow | 2013 |
| BB Fabrications UK Ltd | Tewkesbury | 2008 |
| BB Finishing Limited | Redmarley | 2023 |
| BB Games Ltd | High Wycombe | 2017 |
| BB Global Trading Ltd | Mildenhall | 2024 |
| BB Granulation Services Ltd | Hyde | 2018 |
| BB Health LAB Limited | Birmingham | 2025 |
| BB Kitchen Installations Ltd | Paignton | 2023 |
| BB Kitchens & Bedrooms Ltd | Newcastle Upon Tyne | 2025 |
| BB Laser Design Ltd | Exeter | 2022 |
| BB Lighting Limited | Alfreton | 2014 |
| BB Lights Limited | London | 2018 |
| BB Manufacturing Ltd | Bristol | 2015 |
| BB Marine & Coverguard Limited | Southampton | 1989 |
| BB PAT Test Ltd | London | 2020 |
| BB Printers Ltd | Watford | 2022 |
| BB Sauce (Batty Burner) Ltd | London | 2023 |
| BB Shutters Ltd | Blackburn | 2026 |
| BB Steel Works Ltd | London | 2023 |
| BB Therapeutics Ltd | London | 2023 |
| BB Workshops Limited | Blaydon | 2016 |
| BB Workwear Limited | Leyland | 2025 |
| Bb's Bakery Ltd | Redruth | 2021 |
| BB18 Brewing Co Ltd | Barnoldswick | 2019 |
| BB29 Textile Import Export Ltd | London | 2022 |
| BBA Industries Limited | Manea | 2022 |
| BBA Marketing Ltd | London | 2017 |
| BBB Projects and Design Limited | Wadhurst | 2014 |
| BBB Senang Ltd | Brighton | 2016 |
| BBC Coffee Limited | Southampton | 2020 |
| BBC Concrete Products Ltd | Dewsbury | 2021 |
| BBC Electrical Wholesalers Limited | Blaydon-On-Tyne | 2014 |
| BBC Lighting Construction Ltd | Northolt | 2014 |
| BBC Windows and Doors Ltd | London | 2024 |
| Bbcbjioe Ltd | Belfast | 2024 |
| BBD Bikes Group Ltd | Kirriemuir | 2025 |
| BBD Timberworks Limited | Aylesbury | 2007 |
| BBE Podcast Agency Ltd | Warwick | 2023 |
| BBE Precision Limited | Lincoln | 2000 |
| BBF (Bolton) Limited | Bolton | 2002 |
| BBG Innovation Limited | London | 2026 |
| Bbgr Limited | Bristol | 2000 |
| Bbhomeware Limited | Huddersfield | 2023 |