| Bluetence Limited | London | 2006 |
| Bluetree Medical Limited | Rotherham | 1999 |
| Bluetrip Motor Limited | Bromley | 2025 |
| Bluette Yachting Limited | Woodbridge | 2025 |
| Bluetube Limited | Exeter | 2013 |
| Bluewake Ltd | Bromley | 2026 |
| Bluewhitestar Developments Limited | Warrington | 1988 |
| Bluewind Biotechnology Limited | London | 2023 |
| Bluewire Network Ltd | Farnborough | 2005 |
| Bluewold Ltd | Gloucester | 2015 |
| Bluezone Advance Limited | London | 2024 |
| Blundell's Wood Management Company Limited | Manchester | 2012 |
| Blupebble UK Limited | Dunstable | 2022 |
| Blur London Limited | Bolton | 2023 |
| Bluseal Doors Limited | Worcester | 2010 |
| Bluseal Metals Limited | Worcester | 2010 |
| Blush International Limited | London | 2018 |
| Blusky Property Investments Limited | Andover | 2021 |
| Bluways Hybrids Limited | Brough | 2011 |
| BLW Group Ltd | Sheffield | 2023 |
| BLY Transport Limited | Chard | 2013 |
| Blyth Developments Limited | St. Albans | 2007 |
| Blyth Industrial Assets (NO 1) Limited | Manchester | 2017 |
| Blyth Industrial Assets (NO 2) Limited | Manchester | 2017 |
| Blyth Residential Management Company Limited | Worksop | 2000 |
| Blythwood Flats Management Company Limited | Manor Park | 2003 |
| BM Agency Services Limited | Milton Keynes | 2001 |
| BM Fasteners Limited | Banbury | 2019 |
| BM Home Ground Limited | Wembley | 2017 |
| BM Maskin Investment Limited | London | 2020 |
| BM Mgmt Co Limited | Barnstaple | 2023 |
| BM Print Shop Ltd | Darlington | 2019 |
| BM Property Ventures Ltd | Renfrew | 2021 |
| BM Simonsson Transport & Entreprenad Limited | London | 2021 |
| BM Technologies Limited | London | 1999 |
| BM Time Limited | Bury St. Edmunds | 2013 |
| BM Trada Certification Limited | London | 1987 |
| BM Trada Group Limited | London | 2004 |
| Bm&A UK Ltd | Cardiff | 2017 |
| BM1 Ltd | Glasgow | 2021 |
| BM8 Support Services Limited | Wedmore | 2021 |
| Bmax Consulting Ltd | Shenley | 2021 |
| BMC Analysis Ltd | St Helens | 2025 |
| BMC Investment Management Ltd | Edinburgh | 2012 |
| BMC Manufacturing Services Limited | Sutton-In-Ashfield | 2011 |
| BMC Mowers Limited | Chesterfield | 2013 |
| BMH Relocation Limited | Harrow | 2014 |
| BMI Proactive Services Ltd | Rugby | 2022 |
| Bmibaby.Com Ltd | Poole | 2024 |
| Bmjc Limited | Colchester | 2024 |
| BMK Contracting Engineering Limited | Northampton | 2018 |
| BMK Creation Limited | Llandudno | 2015 |
| Bmkcharles Ltd | Andover | 2024 |
| BML Services (Scotland) Ltd | Comrie | 2024 |
| BML Utilities Group Limited | Northwhich | 2019 |
| BMO Conglomerate Limited | Ilford | 2022 |
| BMO UK Pension Plan Trustee Company Limited | London | 1995 |
| Bmoney Limited | Coleraine | 2014 |
| BMP Management Ltd | West Bridgford | 2015 |
| BMS Controls Systems Ltd | Birmingham | 2019 |
| BMS Janitorial Limited | | 1974 |
| Bms-Bigwood Mechanical Services Limited | Redhill | 2014 |
| Bmst Management Limited | Southsea | 1998 |
| BMT Consulting Services Limited | Salisbury | 2016 |
| BMV Ltd | Southampton | 2025 |
| BMX Bandits Ltd | Harrogate | 2012 |
| BMX Legends Limited | Harrogate | 2012 |
| BMX MAS Ltd | Harrogate | 2012 |
| Bmyt Ltd | Bristol | 2025 |
| BN Gauci Consultancy Limited | Bexhill | 2015 |
| BN Rendering Ltd | Bellshill | 2013 |
| Bnatcon Ltd | London | 2021 |
| Bnbelfast Limited | Belfast | 2018 |
| Bnch Limited | St Albans | 2009 |
| Bnfl (Investments US) Limited | London | 2002 |
| BNG Credits Limited | Mickle Trafford | 2024 |
| BNG Solutions Ltd | Flint | 2020 |
| Bnine Ltd | London | 2024 |
| Bnktop Barbers Ltd | Bradford | 2025 |
| BNM (Essex) Limited | Leigh-On-Sea | 2018 |
| BNM Consulting Limited | Northampton | 2015 |
| BNO Power Services Ltd. | Stoke-On-Trent | 2018 |
| Bnos Yisroel Organisation Limited | Salford | 2005 |
| BNP Paribas Administrative Holdings Limited | | 1964 |
| BNP Paribas Employee Trust II Trustees Limited | London | 2011 |
| BNR Consultancy Limited | London | 2012 |
| BNR Advisers Limited | London | 2012 |
| Bnraji Ltd | Ely | 2025 |
| BNS Property Services Ltd | Bristol | 2024 |
| Bnsi Electrical Contractors Ltd | Sevenoaks | 2022 |
| BNY Clearing Nominees Limited | | 1999 |
| BNY MFM Nominees Limited | London | 1987 |
| BO Boutique Limited | Bournemouth | 2012 |
| BO Limited | Newmarket | 2007 |
| BO Trading Sweden Limited | London | 2023 |
| Bo&Co (Northampton) Ltd | Northampton | 2019 |
| BO55 Ltd | Harrogate | 2017 |
| BOA Education Ltd | Brentwood | 2023 |
| BOA Mate Ltd | Glasgow Central | 2026 |
| BOA Vista Associates Limited | Wallasey | 2015 |