| Barrios Group Ltd | Real estate | 2021 |
| Barroux Ltd | Hospitality | 2025 |
| Barrow Care Ltd | Health & social care | 2018 |
| Barrow Court Residents Association Limited | Households | 1988 |
| Barrow Farm Management Company Limited | Households | 2024 |
| Barrow Hill Veterinary Group Ltd | Extraterritorial | 2011 |
| Barrow Wood Farm Limited | Agriculture & fishing | 2022 |
| Barrs Court Holdings Limited | Real estate | 1997 |
| Barrs Dining Limited | Hospitality | 2025 |
| Barry Cowan Limited | Health & social care | 2006 |
| Barry House Management Company Limited | Households | 2015 |
| Barry J Taylor Limited | Construction | 2003 |
| Barry Reed Limited | Transport & logistics | 1981 |
| Barry Shaddick Tyres Limited | Wholesale & retail | 1997 |
| Barry Towers Limited | Real estate | 2026 |
| Barspoke Bar & Event Management Ltd | Hospitality | 2019 |
| Barstaple House Apartments Limited | Households | 2013 |
| Bart Construction Bristol Ltd | Construction | 2019 |
| Bartab IT Limited | Information & communication | 2011 |
| Bartholomew Group Ltd | Other services | 2025 |
| Bartholomew Transfers Ltd | Transport & logistics | 2025 |
| Bartlett Court Residents Association Limited | Households | 1994 |
| Bartlett Management Services Limited | Professional & scientific | 2020 |
| Bartlett Roche Property Limited | Real estate | 2022 |
| Bartlett Studio Limited | Professional & scientific | 2020 |
| Bartletts Transport and Warehouses Limited | Real estate | 1993 |
| Bartley and Partners Limited | Real estate | 2025 |
| Bartley's Electrical Services Ltd | Construction | 2022 |
| Barton and Barton Ltd | Real estate | 2016 |
| Barton Enterprises Property Ltd | Real estate | 2017 |
| Barton Fabrications Limited | Manufacturing | 1987 |
| Barton Hill Activity Club C.I.C. | Education | 2020 |
| Barton Hill Estate (Management) Limited | Real estate | 2004 |
| Barton Hill Properties Limited | Real estate | 1959 |
| Barton Trustee Limited | Extraterritorial | 2020 |
| Barton Vale Developments Limited | Real estate | 2015 |
| Bartosz Nowak Ltd | Transport & logistics | 2015 |
| Bartwine Limited | Professional & scientific | 1890 |
| Barwaaqo Cafe Ltd | Hospitality | 2020 |
| Barwaaqo Coffee & Desserts Ltd | Hospitality | 2023 |
| BARWAAQO2 Cafe Ltd | Hospitality | 2021 |
| Barwaqo Limited | Transport & logistics | 2020 |
| Baryah & Sons Limited | Real estate | 2023 |
| Baryah Properties 1 Limited | Real estate | 2023 |
| Baryah Properties 2 Limited | Real estate | 2023 |
| Baryah Properties 3 Limited | Real estate | 2023 |
| Baryah Properties Holdings Limited | Financial services | 2023 |
| Baryah Properties Limited | Real estate | 2023 |
| Baryah Real Estates 1 Ltd | Real estate | 2023 |
| Baryah Real Estates 2 Ltd | Real estate | 2023 |
| Baryah Real Estates 3 Ltd | Real estate | 2023 |
| Baryah Real Estates Ltd | Real estate | 2023 |
| BAS Bristol Limited | Professional & scientific | 2003 |
| BAS Consultancy Ltd | Administrative & support | 2018 |
| Bascom Group Limited | Professional & scientific | 2000 |
| Bascom Limited | Administrative & support | 1993 |
| Basdac (2011) LLP | | 2005 |
| Base Adventure Media Ltd | Information & communication | 2021 |
| Base Gym Limited | Arts & recreation | 2025 |
| Base Radio Ltd | Information & communication | 2020 |
| BASEBALL13 Ltd | Transport & logistics | 2023 |
| Based DP Ltd | Real estate | 2024 |
| Based Solutions Ltd | Professional & scientific | 2021 |
| Basekit Platform Limited | Information & communication | 2008 |
| Baseline Project Planning Ltd | Professional & scientific | 2021 |
| Basement 12 Ltd | Real estate | 2017 |
| Basement Beer Ltd | Manufacturing | 2019 |
| Basement Limited | Wholesale & retail | 2024 |
| Bash Entertainment Ltd | Wholesale & retail | 2025 |
| Bash Stunts Ltd | Arts & recreation | 2021 |
| Bashia Limited | Hospitality | 2025 |
| Bashir AA & Sons Ltd | Arts & recreation | 2017 |
| Bashra Aesthetics Ltd | Health & social care | 2022 |
| Basic Black Vision Ltd | Other services | 2023 |
| Basic Space Limited | Professional & scientific | 2011 |
| Basil and Co Bristol Ltd | Hospitality | 2024 |
| Basil's Bakehouse Limited | Manufacturing | 2023 |
| Basil's Bakery Limited | Wholesale & retail | 2022 |
| Basilisk Limited | Information & communication | 2021 |
| Basilon Limited | Real estate | 2013 |
| Baskerville (Bristol) Limited | Wholesale & retail | 2005 |
| Baskerville (Holdings) Limited | Professional & scientific | 2005 |
| Basma Cafe Ltd | Hospitality | 2025 |
| Basra Fleet Ltd | Transport & logistics | 2024 |
| Basrall Limited | Households | 1986 |
| Bass Rock Engineering Management Limited | Professional & scientific | 2011 |
| Bassboy Ltd | Other services | 2021 |
| Basseko Limited | Health & social care | 2022 |
| Bassettwood Ltd | Professional & scientific | 2024 |
| Bassitys Limited | Construction | 2007 |
| Bassline Circus Limited | Arts & recreation | 2004 |
| Bastian Investments Ltd | Real estate | 2020 |
| Bastille Homes Residential Ltd | Real estate | 2022 |
| Bastille Portfolio Limited | Real estate | 2024 |
| Bastille Services Ltd | Construction | 2023 |
| Bastion Pharmacy Limited | Health & social care | 2008 |
| BAT 360 Limited | Education | 2023 |
| Batch Cook Club C.I.C. | Education | 2023 |
| Batch Design Ltd | Professional & scientific | 2020 |
| Batch Talent & Mental Health Solutions Ltd | Administrative & support | 2024 |