| AZ BP Ltd | Administrative & support | 2021 |
| B & R Plumbing & Heating Limited | Construction | 1997 |
| B D Laboratory Ltd | Health & social care | 2015 |
| B Debono Limited | Information & communication | 2023 |
| B J Electrical Limited | Construction | 2025 |
| B M H (Heating) Limited | Construction | 1998 |
| B Payne Property Solutions Limited | Construction | 2013 |
| B&A Global Limited | Wholesale & retail | 2025 |
| B&B Taxis Ltd | Real estate | 2024 |
| B&M Plumbing and Heating Southern Ltd | Construction | 2019 |
| B'Robin Garden Service Ltd | Water & waste | 2025 |
| B. & K. Boiler Services Limited | Construction | 1999 |
| B. & K. Plumbing and Heating Limited | Construction | 1983 |
| B2B Leads New Generation Ltd | Professional & scientific | 2026 |
| B4IFTAR Ltd | Education | 2020 |
| Babouche Golf Limited | Wholesale & retail | 2024 |
| Babygear (Camberley) Limited | Wholesale & retail | 2016 |
| Back 2 Wellness Ltd | Extraterritorial | 2021 |
| Badger Group (Holdings) Limited | Real estate | 2005 |
| Badger Holdings Limited | Real estate | 1995 |
| Badminton Court Management (2016) Limited | Real estate | 2016 |
| BAE Systems (AL Diriyah C4I) Limited | Public administration | 2004 |
| BAE Systems (Corporate Air Travel) Limited | Transport & logistics | 1998 |
| BAE Systems (Defence Systems) Limited | Public administration | 1929 |
| BAE Systems (Dynamics) Limited | Administrative & support | 1991 |
| BAE Systems (Farnborough 3) Limited | Real estate | 1992 |
| BAE Systems (Finance) Limited | Administrative & support | 1995 |
| BAE Systems (Funding Two) Limited | Administrative & support | 2001 |
| BAE Systems (Gripen Overseas) Limited | Professional & scientific | 1997 |
| BAE Systems (Holdings) Limited | Financial services | 2004 |
| BAE Systems (International) Limited | Administrative & support | 1989 |
| BAE Systems (Kazakhstan) Limited | Financial services | 1998 |
| BAE Systems (Land and Sea Systems) Limited | Public administration | 1990 |
| BAE Systems (MEH) Limited | Financial services | 2001 |
| BAE Systems (Military Air) Overseas Limited | Public administration | 1990 |
| BAE Systems (Nominees) Limited | Extraterritorial | 1988 |
| BAE Systems (Oman) Limited | Public administration | 1995 |
| BAE Systems (Operations) Limited | Manufacturing | 1986 |
| BAE Systems (Overseas Holdings) Limited | Professional & scientific | 1993 |
| BAE Systems (Projects) Limited | Extraterritorial | 1947 |
| BAE Systems (Property Investments) Limited | Real estate | 1998 |
| BAE Systems 2000 Pension Plan Trustees Limited | Extraterritorial | 1998 |
| BAE Systems Arabian Industries (Capability & Training - UK) Ltd | Administrative & support | 2015 |
| BAE Systems Arabian Industries (Supply Chain - UK) Ltd | Administrative & support | 2016 |
| BAE Systems Corporate Secretary Limited | Professional & scientific | 1984 |
| BAE Systems Deployed Systems Limited | Extraterritorial | 1996 |
| BAE Systems Electronic Systems (Overseas) Limited | Public administration | 2013 |
| BAE Systems Electronics Limited | Financial services | 1897 |
| BAE Systems Enterprises Limited | Administrative & support | 1963 |
| BAE Systems Executive Pension Scheme Trustees Limited | Extraterritorial | 1991 |
| BAE Systems GCS International Limited | Manufacturing | 2019 |
| BAE Systems Global Combat Systems Munitions Limited | Manufacturing | 1984 |
| BAE Systems Integrated System Technologies (KSA) Limited | Public administration | 2008 |
| BAE Systems Integrated System Technologies (Overseas) Limited | Public administration | 1998 |
| BAE Systems Integrated System Technologies Limited | Financial services | 1997 |
| BAE Systems Land Systems (Finance) Limited | Financial services | 1991 |
| BAE Systems Land Systems ATF Limited | Extraterritorial | 1999 |
| BAE Systems Land Systems Pinzgauer (Holdings) Limited | Extraterritorial | 1999 |
| BAE Systems Land Systems Pinzgauer Limited | Wholesale & retail | 1993 |
| BAE Systems Marine (Holdings) Limited | Financial services | 1985 |
| BAE Systems Marine (YSL) Limited | Extraterritorial | 1966 |
| BAE Systems Marine Limited | Manufacturing | 1928 |
| BAE Systems Pension Funds CIF Trustees Limited | Extraterritorial | 1994 |
| BAE Systems Pension Funds Investment Management Limited | Professional & scientific | 1926 |
| BAE Systems Pension Funds Trustees Limited | Extraterritorial | 1963 |
| BAE Systems Project Services Limited | Public administration | 1955 |
| BAE Systems Projects (Canada) Limited | Extraterritorial | 1986 |
| BAE Systems Properties Limited | Real estate | 1993 |
| BAE Systems Saudi Arabia (Vehicles and Equipment Holdings) Limited | Extraterritorial | 2010 |
| BAE Systems Saudi Arabia (Vehicles and Equipment Nominees) Limited | Extraterritorial | 2010 |
| BAE Systems Services Limited | Information & communication | 2014 |
| BAE Systems Surface Ships (Holdings) Limited | Financial services | 2007 |
| BAE Systems Surface Ships (Overseas) Limited | Financial services | 2009 |
| BAE Systems Surface Ships (Projects) Limited | Administrative & support | 2007 |
| BAE Systems Surface Ships Integrated Support Limited | Professional & scientific | 1987 |
| BAE Systems Surface Ships International Limited | Manufacturing | 2002 |
| BAE Systems Surface Ships Limited | Manufacturing | 2007 |
| BAF Group Ltd | Wholesale & retail | 2019 |
| BAG Fordham Properties Limited | Real estate | 2020 |
| Bagshot (High Street) Management Company Limited | Households | 1999 |
| Baileys Pest Control Limited | Administrative & support | 2015 |
| Bajrang Properties Ltd | Real estate | 2026 |
| Bakabooks Ltd | Wholesale & retail | 2026 |
| Bake District Ltd | Manufacturing | 2018 |
| Bakici Ltd | Hospitality | 2025 |
| Balance & Bond Ltd | Other services | 2026 |
| Balcon DEL MAR Properties Limited | Professional & scientific | 1994 |
| Bali Beach Club Title Limited | Professional & scientific | 1996 |
| Bami Driving School Ltd | Education | 2016 |
| Bandmaster Limited | Administrative & support | 2007 |
| Bank House Law Ltd | Professional & scientific | 2025 |
| Baobab Financial Solutions Limited | Financial services | 2026 |
| Baogui Kitchen Ltd | Hospitality | 2025 |
| Barclay Heritage Ltd | Wholesale & retail | 2025 |
| Bark in the Park Limited | Other services | 2016 |
| Barkley's Financial Services Ltd | Financial services | 2020 |
| Barley Sprig Supported Living Ltd | Administrative & support | 2023 |
| Barmy Rubble Limited | Real estate | 2023 |
| Barnes & Sons Ltd | Health & social care | 2014 |
| Barnsdale Country Club Title Limited | Professional & scientific | 1994 |