| Bilbo's Campervans Limited | South Godstone | 2024 |
| Bilbos Design Limited | South Godstone | 2024 |
| Bildelen.Se Limited | London | 2025 |
| Bileron Ltd | London | 2015 |
| Bilikis Oko-Osi Ltd | London | 2024 |
| Biline Telecom Co., Ltd | London | 2014 |
| Bilivest Limited | Pencoed, Bridgend | 2005 |
| Bill Ayling Limited | Longfield | 2018 |
| Bill Brown Charity Trustees | London | 2020 |
| Bill Clinic Ltd | Harwich | 2022 |
| Bill Peach Wealth Management Ltd | Cirencester | 2012 |
| Bill Smith Motors (Liverpool) Limited | Cheshire | 1988 |
| Bill Wyman Archive Limited | London | 1992 |
| Bill's Mobile Tyres Wickford Ltd | Wickford | 2023 |
| Billann Ltd | Doncaster | 2021 |
| Billberg Entertainment Invest Limited | London | 2013 |
| Billbio Ltd | London | 2024 |
| Billed to YOU Limited | London | 2008 |
| Billericay Technical Solutions Ltd | Billericay | 2022 |
| Billet Land Ltd | Brentwood | 2006 |
| Billett Consulting Limited | London | 1999 |
| Billetts International Limited | London | 1997 |
| Billetts Marketing Investment Management Limited | London | 1998 |
| Billetts Marketing Sciences Limited | London | 2001 |
| Billetts Media Consulting Limited | London | 1985 |
| Billfreehomes (Leasing) Ltd | Loughborough | 2001 |
| Billiard CUE Enterprises Limited | Caldicot | 1999 |
| Billingham Holdings Ltd | Caerphilly | 2015 |
| Billingsdale Ltd | Enfield | 2004 |
| Billingshurst Cleaning Co. Ltd | Billingshurst | 2025 |
| Billingsley Ltd | Preston | 2025 |
| Billington Estate Management Limited | Hornchurch | 2014 |
| Billion Dollar Girl Limited | London | 2019 |
| Billion Records Ltd | Newark | 2024 |
| Billionaire Jewelry Limited | London | 2021 |
| Billions and Bullions Ltd | Basildon | 2024 |
| Billoyd Autos Limited | Darwen | 2002 |
| Bills Food Ltd | Midhurst | 2022 |
| Billsafe Ltd | Tonbridge | 2017 |
| Billsons Holdings Limited | Kettering | 2015 |
| Billtoquote Limited | Beckenham | 2000 |
| Billy Bowie Tanker Services Limited | Ayrshire | 1997 |
| Billy Smart's Circus Limited | West Sussex | 1990 |
| Billy Willmington Ltd | Market Rasen | 2024 |
| Bilmar Yachting Ltd | London | 2009 |
| Bilon & Stuart Limited | Glasgow | 2012 |
| Bilrf Engineering and Yachting Ltd | Bromsgrove | 2023 |
| Bilspecialisterna Limited | London | 2025 |
| Bilston & Battersea Enamels Limited | Carlisle | 1968 |
| Bilston 1955 Limited | Willenhall | 2014 |
| Bilston Glen Estates Limited | Edinburgh | 2010 |
| Bilt Limited | Holywell | 2004 |
| Bilton Dene Limited | Harrogate | 2014 |
| Bilton Veterinary Centre Limited | Bristol | 2004 |
| BIM (Building Information Modelling) Limited | London | 2011 |
| Bimax Medicine Ltd | Kington | 2015 |
| Bimla Devi Mahrra Ltd | Luton | 2022 |
| Bimmell Limited | Leeds | 2022 |
| Bimoi Limited | London | 2010 |
| BIN Bits Limited | Spalding | 2012 |
| BIN Buddyz Ltd | London | 2025 |
| Binanmaike Mining Machinery Ltd | London | 2023 |
| Binaries Consultancy Limited | Oadby | 2017 |
| Binary Forge Limited | Barnsley | 2022 |
| Bind and Brew Ltd | Bristol | 2024 |
| Bindi (London) Limited | Harrow | 1994 |
| Bindicator Instruments Ltd. | London | 2025 |
| Binding and Presentation Supplies Limited | Addlestone | 1985 |
| Bineham Court Management Company Limited | Langport | 1999 |
| Bing Bing Diamond Limited | Beckenham | 2012 |
| Bing&Me Ltd | Manchester | 2025 |
| Bingaglo Limited | Manchester | 2025 |
| Bingbong Appliances L Limited | Selby | 2026 |
| Bingham Developments Limited | Skipton | 1985 |
| Bingham Management Ltd | Ruislip | 2014 |
| Bingleston UK Limited | London | 2011 |
| Bingmax Engineering Co., Ltd. | Beckenham | 2018 |
| Bingo Britain Limited | Great Yarmouth | 2002 |
| Bingo Gift Commerce Co., Limited | Beckenham | 2014 |
| Bingo Sites Ltd | London | 2016 |
| Bingstar Tech Co., Ltd | London | 2015 |
| Bingswood Holding Limited | Warrington | 2021 |
| Binky Medical Devices Limited | Southam | 2017 |
| Binley 1964 Limited | Coventry | 2014 |
| Binn Eadair Investments Ltd | Dungannon | 2026 |
| Binnings of Cumbria Limited | Carlisle | 2002 |
| Binny Investments Ltd | Broxburn | 2010 |
| Binny Traders & Suppliers Limited | Hounslow | 2011 |
| Binocular Vision Limited | South Petherton | 2013 |
| Binsey Green Holdings Limited | Oxford | 2004 |
| Binstead Management Limited | Ryde | 2005 |
| Binsted Publications Limited | Farnham | 1992 |
| BIO Base UK Limited | London | 2011 |
| BIO Capchar Ltd | Hereford | 2024 |
| BIO Group Trading Ltd | Beckenham | 2016 |
| BIO Habitat Ltd | Narberth | 2011 |
| BIO Harmony Limited | London | 2025 |
| BIO Loam Ltd | Hereford | 2024 |
| BIO NG Ltd | Narberth | 2011 |
| BIO Origin Pharma Limited | Beckenham | 2024 |