| Barking & Havering Lift (Midco) Limited | Professional & scientific | 2006 |
| Barking & Havering Lift Company (NO.1) Limited | Real estate | 2003 |
| Barking Dagenham Havering Community Ventures Limited | Real estate | 2003 |
| Barkley Developments Ltd | Real estate | 2026 |
| Barkley Plastics Limited | Manufacturing | 1965 |
| Barlands Limited | Professional & scientific | 2023 |
| Barley Care Group Ltd | Financial services | 2025 |
| Barlows Properties (Midlands) Limited | Real estate | 2013 |
| Barmar Ltd | Transport & logistics | 2024 |
| Barmaster Investments Limited | Hospitality | 2017 |
| Barnaba Enterprises Ltd | Wholesale & retail | 2025 |
| Barnabas Consulting Limited | Professional & scientific | 2020 |
| Barnard Co. Limited | Information & communication | 2016 |
| Barnard Payne Consulting Limited | Extraterritorial | 2008 |
| Barnard Payne Holdings Limited | Professional & scientific | 2008 |
| Barnards Green PO Ltd | Transport & logistics | 2026 |
| Barnes and Moore Leatherworks Limited | Manufacturing | 2016 |
| Barnes High Level Cleaning Specialists Ltd | Administrative & support | 2023 |
| Barnes Medical Ltd | Health & social care | 2013 |
| Barnes Property Solutions Limited | Real estate | 2020 |
| Barnes Resale Limited | Wholesale & retail | 2024 |
| Barnesmore Civil Engineering Limited | Construction | 2015 |
| Barnesmore Construction Limited | Construction | 2000 |
| Barnesmore Investments Limited | Construction | 2009 |
| Barnett Lettings Ltd | Real estate | 2024 |
| Barnett Ravenscroft Holdings Limited | Financial services | 2024 |
| Barnett Ravenscroft Limited | Professional & scientific | 2013 |
| Barnett TM Services Ltd | Construction | 2018 |
| Barney's Barbers Birmingham Limited | Other services | 2016 |
| Barney's Fast Food Ltd | Hospitality | 2026 |
| Barneys Barber Shop Ltd | Other services | 2025 |
| Barnie Associates Limited | Administrative & support | 2015 |
| Barnsley Management Limited | Real estate | 1990 |
| Barnt Green Boarding Cattery Limited | Hospitality | 2003 |
| Barnt Green Investments Ltd | Real estate | 2024 |
| Barnt Green Pharmacy Limited | Wholesale & retail | 1991 |
| Barnt Green Pirates Ltd | Health & social care | 2015 |
| Barnt Green Property Services Ltd | Administrative & support | 2019 |
| Barnt Green Sports Club | Arts & recreation | 2016 |
| Barnt Green Waters Limited | Arts & recreation | 1920 |
| Barnwood Properties Limited | Financial services | 1958 |
| Baron Investment Group Ltd | Real estate | 2023 |
| Baronash Ltd | Construction | 2021 |
| Baronissima Limited | Administrative & support | 2014 |
| Barons Close Tenants Association Limited | Households | 1962 |
| Baroque Works Ltd | Professional & scientific | 2018 |
| Barpaga Ltd | Other services | 2018 |
| Barquer Training & Consultancy Ltd | Administrative & support | 2018 |
| Barques Design Limited | Professional & scientific | 1988 |
| Barques Property Limited | Professional & scientific | 2021 |
| Barques Public Relations Ltd | Professional & scientific | 2010 |
| Barques Trading Limited | Professional & scientific | 2021 |
| Barr View Primary & Nursery Academy | Education | 2012 |
| Barra Management Limited | Households | 2004 |
| Barracuda Property Management Ltd | Real estate | 2025 |
| Barrani Ltd | Transport & logistics | 2025 |
| Barratt Last Estate Agents Limited | Real estate | 2009 |
| Barrel & Bond Whisky Tasting Ltd | Wholesale & retail | 2023 |
| Barrett & Bernie Holdings Limited | Professional & scientific | 2010 |
| Barretts Sausage Ltd | Manufacturing | 2014 |
| Barri Davies Electric Payroll 02 Ltd | Administrative & support | 2024 |
| Barrie Bristol Consultancy Ltd | Professional & scientific | 2025 |
| Barrie Fellows Driver Services Ltd | Transport & logistics | 2015 |
| Barrier Base Ltd | Manufacturing | 2025 |
| Barrington Caddick Estate Agents and Lettings Ltd. | Real estate | 2010 |
| Barrington Solutions Ltd | Transport & logistics | 2025 |
| Barristers Direct Access Limited | Professional & scientific | 2011 |
| Barron & Co Ltd | Professional & scientific | 2013 |
| Barros LLC Limited | Real estate | 2020 |
| Barrow Mill Ltd | Extraterritorial | 2020 |
| Barrows Developments Ltd | Construction | 2026 |
| Barrs Transport Ltd | Construction | 2012 |
| Barry Property Services Ltd | Construction | 2017 |
| Barry Roberts Ltd | Transport & logistics | 2015 |
| Barry Vigers Ltd | Wholesale & retail | 2003 |
| Bars (COMMERCIAL2) Ltd | Wholesale & retail | 2024 |
| Bars Pubs Cafes Trading Limited | Hospitality | 2020 |
| Bartel Intercontact Ltd | Professional & scientific | 2026 |
| Bartf Productions | Other services | 2005 |
| Bartha Ltd | Professional & scientific | 2019 |
| Bartleet Property Ltd | Real estate | 2026 |
| Bartley Green Car Wash Ltd | Administrative & support | 2025 |
| Bartley Green Community Boxing Club | Arts & recreation | 2015 |
| Bartley Green Community Hub CIC | Public administration | 2024 |
| Bartley Green School | Education | 2011 |
| Bartley Sailing Club Limited | Arts & recreation | 1984 |
| Bartolotta Paint Technical Support Ltd | Professional & scientific | 2021 |
| Barton Business Park Property Management Limited | Extraterritorial | 2004 |
| Barton Ventures Management Ltd | Real estate | 2024 |
| Bartongate Ltd | Wholesale & retail | 2018 |
| Bartons Property Holdings Limited | Real estate | 2022 |
| Bartor Limited | Wholesale & retail | 2018 |
| Baruwal Properties Limited | Real estate | 2024 |
| Barvue Ltd | Manufacturing | 2022 |
| Barwaaqo Transport Ltd | Transport & logistics | 2020 |
| Barwaqo Design Ltd | Wholesale & retail | 2023 |
| Barwick Solutions Ltd | Health & social care | 2015 |
| Barzakh Ltd | Other services | 2011 |
| Barzan 1 Ltd | Transport & logistics | 2025 |
| Barzangi Linguistic Service Ltd | Professional & scientific | 2004 |