| BP Holdings Iraq Ltd | Professional & scientific | 2021 |
| BP Holdings North America Limited | Professional & scientific | 2006 |
| BP Hydrogen and CCS Development Company Limited | Professional & scientific | 2023 |
| BP Integrated Solutions Limited | Financial services | 2021 |
| BP International Limited | Wholesale & retail | 1954 |
| BP Investment Management Limited | Administrative & support | 1936 |
| BP Investments Asia Limited | Professional & scientific | 2005 |
| BP Kuwait Limited | Mining & quarrying | 1934 |
| BP Marine Limited | Wholesale & retail | 1975 |
| BP Middle East Limited | Wholesale & retail | 1957 |
| BP Mocambique Limited | Wholesale & retail | 1929 |
| BP Motion Holdings Limited | Financial services | 2025 |
| BP NZT Power Holdings Limited | Financial services | 2023 |
| BP OIL International Limited | Wholesale & retail | 1936 |
| BP OIL UK Limited | Manufacturing | 1947 |
| BP OIL Yemen Limited | Wholesale & retail | 1923 |
| BP Pension Trustees Limited | Financial services | 1928 |
| BP Pensions Limited | Financial services | 1977 |
| BP Pipelines (BTC) Limited | Professional & scientific | 2001 |
| BP Pipelines (SCP) Limited | Professional & scientific | 2002 |
| BP Properties Limited | Real estate | 1961 |
| BP Retail Properties Limited | Financial services | 2020 |
| BP Russian Investments Limited | Professional & scientific | 1990 |
| BP Scale UP Factory Limited | Professional & scientific | 2018 |
| BP Services International Limited | Professional & scientific | 2004 |
| BP Shipping Limited | Transport & logistics | 1915 |
| BP South America Holdings Ltd | Professional & scientific | 2018 |
| BP Technology Ventures Limited | Professional & scientific | 1981 |
| BPA Engineering Limited | Manufacturing | 1996 |
| BPJ Holdings Limited | Other services | 2020 |
| Bradstrong Limited | Real estate | 2003 |
| Bramville Ltd | Real estate | 2003 |
| Brancaster Ltd | Households | 2011 |
| Branded Originals Limited | Wholesale & retail | 2007 |
| Brar Properties Ltd | Real estate | 2003 |
| BRE - Leyland Limited | | 1933 |
| Breath of Life Foundation | Health & social care | 2005 |
| Breathing in the Moment Ltd | Professional & scientific | 2024 |
| Brecknock Supermarket Ltd | Wholesale & retail | 2016 |
| Brendan. Kelly | | 1998 |
| Brent Indian Association | Other services | 1997 |
| Brent OIL Contractors Limited | Water & waste | 1977 |
| Brentford & Chiswick Formwork Limited | Construction | 1970 |
| Brew Brothers Limited | | 1963 |
| Brian Paul Limited | Professional & scientific | 1998 |
| Brian. Carver | | 1998 |
| Brickwall Stores Limited | | 1956 |
| Bridge Wharf Residents Association (Isleworth) Limited | Real estate | 1987 |
| Bridgewater Heating & Plumbing Limited | Construction | 2006 |
| Brigdon Systems Limited | Information & communication | 1998 |
| Bright 'N Breezy Laundry Services Limited | Other services | 1999 |
| Brightstar Media Limited | Information & communication | 2004 |
| Brightsun Freight Ltd | Transport & logistics | 1988 |
| Brightsun Travel (UK) Limited | Transport & logistics | 1986 |
| Brightwell Properties Limited | Real estate | 2006 |
| Brilliant Buildings Limited Liability Partnership | | 2005 |
| Brilliant Systems Limited | Information & communication | 1989 |
| Brit-El Limited | Professional & scientific | 2007 |
| Britain Tech Ltd | Wholesale & retail | 2009 |
| Britannic Energy Trading Limited | Administrative & support | 1978 |
| Britannic Investments Iraq Limited | Financial services | 2012 |
| Britannic Trading Limited | Administrative & support | 1966 |
| Brittin Builders Ltd | Wholesale & retail | 2005 |
| Broadway Farms Limited | | 1983 |
| Broadway Travel Limited | Arts & recreation | 1985 |
| Brooklyn House Residents Company Limited | Households | 1991 |
| Brooks (Gerrards Cross) Limited | Hospitality | 1979 |
| Brow Labs by Reena Pabari Ltd | Other services | 2017 |
| Bruce Bookmakers Limited | Arts & recreation | 2003 |
| Brunominster Limited | | 1985 |
| Brushed Limited | Other services | 2004 |
| Bryan Maher Limited | Real estate | 2006 |
| Brycken Limited | Construction | 1996 |
| Bryer Properties Limited | Real estate | 1959 |
| Brymount Properties Limited | Real estate | 2014 |
| Brynrise Limited | Real estate | 1965 |
| BSP Hospitality Ltd | Hospitality | 2025 |
| BSP Secretarial Limited | Professional & scientific | 2000 |
| BTC Holdings Limited | Information & communication | 1993 |
| Btres.Com Limited | Administrative & support | 2004 |
| Bubbaboom.Com Limited | Administrative & support | 2006 |
| Bubu Business Hub (UK) Ltd | Wholesale & retail | 2021 |
| Bubu Construction Ltd | Other services | 2018 |
| Budding Learners Limited | Education | 2004 |
| Buildcare Solutions Limited | Construction | 2025 |
| Building Contractor Services Limited | Professional & scientific | 2004 |
| Buildquest Limited | Construction | 1977 |
| Bujani Ltd | Administrative & support | 2014 |
| Bukmos Services Limited | Professional & scientific | 2017 |
| Bull Steak House Ltd | Hospitality | 2019 |
| BUN N Roll Xpress Ltd | Hospitality | 2021 |
| Burford & SON Ltd | Wholesale & retail | 2007 |
| Burgess Furniture Ltd | Manufacturing | 1988 |
| Burn & Hawkins Limited | Construction | 2001 |
| Burnt Oak Wallpapers Limited | Real estate | 1944 |
| Burwood Management Limited | Real estate | 2005 |
| Bushy Park Mews Residents Association Limited | Households | 1997 |
| Business 2 Technology Limited | Information & communication | 2001 |
| Business Administration & Technical Services Ltd. | Professional & scientific | 1992 |
| Business Data Technology Limited | Information & communication | 1995 |