| Berts Shoe Repairs Limited | Other services | 2003 |
| Bestfield Ltd | Construction | 2015 |
| Bestvenues Property Limited | Real estate | 2007 |
| Bestway Support Limited | Health & social care | 2023 |
| Betacom Systems Limited | Information & communication | 1996 |
| Betaplex Limited | Professional & scientific | 2003 |
| Bethphage Logistics Limited | Transport & logistics | 2006 |
| Betropical Ltd | Wholesale & retail | 2005 |
| Bewley Motors Limited | Wholesale & retail | 2001 |
| Bgfx Limited | Information & communication | 2010 |
| Bhachu Brothers Ltd | Wholesale & retail | 2005 |
| Bhalla Limited | | 1986 |
| Bhardwaj Limited | Wholesale & retail | 1991 |
| Big Bite Limited | Hospitality | 2006 |
| Big Films Limited | Information & communication | 2017 |
| Big Fishy (the Mighty FIN) Limited | Information & communication | 1995 |
| Big Point Mobile Limited | Wholesale & retail | 2021 |
| Bigger Things Limited | Construction | 1999 |
| Bina Locum Optometry Limited | Health & social care | 2019 |
| Bindi Sagoo Ltd | Transport & logistics | 2015 |
| Biomimic Studio Ltd | Information & communication | 2020 |
| Bitweb Limited | | 2003 |
| BIZ Holdings Limited | Administrative & support | 2022 |
| Black Arts Inc Ltd | Information & communication | 2023 |
| Black Katz Eddy (Holdings) Limited | Real estate | 1997 |
| Black Katz Eddy Limited | Real estate | 1992 |
| Blackbrickwall Ltd | Professional & scientific | 2007 |
| Blackwater Valley Golf Centre Limited | Arts & recreation | 2003 |
| Blakeney House Residents Association Limited(The) | Households | 1980 |
| Blessed Laundrette Limited | Other services | 2005 |
| Bloomgold Limited | Real estate | 2005 |
| Blooming Maintenance Ltd | Construction | 2018 |
| Bloomsbury Realty Management Ltd | Hospitality | 2007 |
| Blue Atlas Wealth Limited | Financial services | 2013 |
| Blue Dragon(Beaconsfield)Limited | Other services | 1919 |
| Blue Gnome Computers Limited | Wholesale & retail | 2003 |
| Blue Indigo Design Limited | Other services | 2004 |
| Blue Ocean Strategy UK Limited | Professional & scientific | 2005 |
| Blue Sky Guttering Group Ltd | Water & waste | 2004 |
| Blueginger Properties Limited | Real estate | 2003 |
| Blueraq Networks Limited | Information & communication | 2004 |
| Blueshift Services Limited | Professional & scientific | 2022 |
| Bluestar Properties Limited | Hospitality | 1997 |
| Bluetor Limited | Manufacturing | 2006 |
| BLV Exports Limited | Wholesale & retail | 2023 |
| BMA Design and Construction Limited | Construction | 2020 |
| Bmtw 12 Limited | Hospitality | 2013 |
| Bodygoalsbyjk Limited | Other services | 2025 |
| Bogdan Limited | Construction | 2003 |
| Bol-Y-Maer Apartments Management Company Limited | Households | 2021 |
| Bolton a and B Limited | Households | 2004 |
| Bombay Spicy Ltd | Hospitality | 2013 |
| Bonded Freight Services Limited | Transport & logistics | 2000 |
| Booth Ventilating Limited | Manufacturing | 1951 |
| Border Crossings Company Limited | Arts & recreation | 1995 |
| Bossville Limited | Professional & scientific | 1996 |
| BP (ABU Dhabi) Limited | Mining & quarrying | 1962 |
| BP (Barbican) Limited | Administrative & support | 1973 |
| BP (Gibraltar) Limited | Administrative & support | 1955 |
| BP (GTA Mauritania) Finance Limited | Mining & quarrying | 2019 |
| BP (GTA Senegal) Finance Limited | Mining & quarrying | 2019 |
| BP Africa Limited | Professional & scientific | 1971 |
| BP Africa OIL Limited | Administrative & support | 2019 |
| BP Alternative Energy Investments Limited | Professional & scientific | 2006 |
| BP Asia Pacific Holdings Limited | Professional & scientific | 1973 |
| BP Benevolent Fund Trustees Limited | Financial services | 1948 |
| BP Capital Markets P.L.C. | Financial services | 1976 |
| BP Ccus UK NEP Limited | Financial services | 2023 |
| BP Chemicals Limited | Manufacturing | 1924 |
| BP Continental Holdings Limited | Professional & scientific | 1953 |
| BP Corporate Holdings Limited | Professional & scientific | 2000 |
| BP D230 Limited | Professional & scientific | 2018 |
| BP East Kalimantan CBM Limited | Mining & quarrying | 2007 |
| BP Eastern Mediterranean Limited | Wholesale & retail | 1988 |
| BP Energy Colombia Limited | Administrative & support | 1999 |
| BP Energy Europe B.V. | | 2025 |
| BP Exploration (Alpha) Limited | Mining & quarrying | 1971 |
| BP Exploration (Azerbaijan) Limited | Mining & quarrying | 1987 |
| BP Exploration (Caspian Sea) Limited | Mining & quarrying | 1946 |
| BP Exploration (D230) Limited | Mining & quarrying | 2019 |
| BP Exploration (Delta) Limited | Mining & quarrying | 1970 |
| BP Exploration (Epsilon) Limited | Mining & quarrying | 1971 |
| BP Exploration (Shah Deniz) Limited | Mining & quarrying | 1996 |
| BP Exploration (STP) Limited | Mining & quarrying | 2018 |
| BP Exploration (Uzbekistan) Limited | Mining & quarrying | 2026 |
| BP Exploration Argentina Limited | Mining & quarrying | 2019 |
| BP Exploration Beta Limited | Mining & quarrying | 1967 |
| BP Exploration Company (Middle East) Limited | Mining & quarrying | 1914 |
| BP Exploration Indonesia Limited | Mining & quarrying | 1971 |
| BP Exploration Libya Limited | Mining & quarrying | 2005 |
| BP Exploration North Africa Limited | Mining & quarrying | 2005 |
| BP Exploration Operating Company Limited | Mining & quarrying | 1935 |
| BP Exploration Orinoco Limited | Mining & quarrying | 1958 |
| BP Express Shopping Limited | Wholesale & retail | 1926 |
| BP Finance P.L.C | Financial services | 2001 |
| BP Gamma Holdings Limited | Financial services | 2023 |
| BP GAS Marketing Limited | Mining & quarrying | 1967 |
| BP Global Investments Limited | Professional & scientific | 1932 |
| BP Global Solutions Limited | Other services | 2021 |
| BP Greece Limited | Professional & scientific | 1921 |