| Barbican Kitchen Limited | Hospitality | 2009 |
| Barbican Laundry Services Ltd | Other services | 2024 |
| Barbican Marina Apartments Limited | Real estate | 2021 |
| Barbican Monkey Ltd | Households | 2022 |
| Barbican Plymouth Limited | Hospitality | 2021 |
| Barbican Rooms Limited | Wholesale & retail | 1995 |
| Barbican T Steakhouse Ltd | Hospitality | 2021 |
| Barbican Theatre Trading Limited | Arts & recreation | 2004 |
| Barbican Trading Ltd | Hospitality | 2019 |
| Barbican Yacht Construction Limited | Energy | 1978 |
| Barbican Yachts Ltd | Transport & logistics | 2015 |
| Barden Aerospace (UK) Limited | Manufacturing | 2023 |
| Barden Corporation (UK) Limited | Manufacturing | 2023 |
| Barden Super Precision Bearings Limited | Manufacturing | 2023 |
| Bare GLO Ltd | Extraterritorial | 2025 |
| Barge Rumba Ltd | Hospitality | 2025 |
| Bargemasters South West Ltd | Transport & logistics | 2013 |
| Baria Marine Ltd | Manufacturing | 2025 |
| Baring Flats Management Company Limited | Households | 1963 |
| Baring Street RTM Company Limited | Households | 2004 |
| Barista Brothers Limited | Hospitality | 2010 |
| Barlow and Smith Plumbing and Heating Services Ltd | Construction | 2023 |
| Barn Close Properties Limited | Real estate | 2019 |
| Barncott Management Limited | Households | 1994 |
| Barnes Holding Group Limited | Financial services | 2024 |
| Barreled Events Limited | Hospitality | 2019 |
| Barron Estates Ltd | Real estate | 2017 |
| Barron Surveying Services Ltd | Professional & scientific | 2005 |
| Bartlett Heating Ltd | Construction | 2024 |
| Bartlett Homes Building Services Limited | Construction | 2015 |
| Bartons Building Limited | Construction | 2017 |
| Base and Line Aviation Ltd | Professional & scientific | 2014 |
| Base Electrics Ltd | Manufacturing | 2009 |
| Base Lighting Ltd | Manufacturing | 2010 |
| Basic FLO Limited | Information & communication | 1997 |
| Basis Trades Ltd | Other services | 2015 |
| Bassett’S Mobile Valeting Ltd | Wholesale & retail | 2025 |
| Batchbrook Holdings Ltd | Real estate | 2026 |
| Bateman & Lynch Cars Tavistock Ltd | Wholesale & retail | 2021 |
| Bateman & Lynch Holdings Ltd | Professional & scientific | 2021 |
| Bateman & Lynch Liskeard Holdings Ltd | Professional & scientific | 2025 |
| Bates Development Services Ltd | Professional & scientific | 2018 |
| Batesmillfield Financial Planning (SW) Limited | Financial services | 2006 |
| Batterbee Thompson & Co Limited | Professional & scientific | 2005 |
| Batteries and Solar Ltd | Manufacturing | 2016 |
| Battersby Surgical Ltd | Health & social care | 2020 |
| Bayfield Cobb Legal Service Ltd | Administrative & support | 2015 |
| Baypeak Limited | Real estate | 1996 |
| Bayside Property Management Limited | Real estate | 1995 |
| BB Excell Designs Ltd | Wholesale & retail | 2022 |
| BB Transform Fencing Decking & Landscape Ltd | Administrative & support | 2021 |
| BBB Management Ltd | Professional & scientific | 2014 |
| BBJ Plaster and Rendering Limited | Construction | 2015 |
| Bbkco Ltd | Hospitality | 2021 |
| BBS Bespoke Building Services Limited | Construction | 2020 |
| BBS Specialists Limited | Construction | 2017 |
| BC Building Services (South West) Ltd | Construction | 2015 |
| BC Entertainments (UK) Ltd | Arts & recreation | 2014 |
| Bcce Ltd | Construction | 2017 |
| Bcds Properties Ltd | Real estate | 2025 |
| BCE Defensive Ltd | Extraterritorial | 2022 |
| BD Concepts Holdings Limited | Financial services | 2024 |
| BD Concepts Limited | Extraterritorial | 2013 |
| BD Works Limited | Other services | 2019 |
| BDG Holdings Ltd | Real estate | 2008 |
| BDG Properties South West Ltd | Households | 2018 |
| BDM Fenestrations Ltd | Construction | 2025 |
| BE Goode Limited | Other services | 2019 |
| BE Hard to Hack Limited | Education | 2025 |
| BE My Guest Rentals Ltd | Real estate | 2023 |
| BE Nestled Ltd | Administrative & support | 2026 |
| BE Properties (Plymouth) Limited | Households | 2012 |
| BE Unique Bootcamp Limited | Other services | 2024 |
| BE Unique Investments Limited | Real estate | 2025 |
| BE Unique Wellbeing Limited | Other services | 2017 |
| Beachdown 2 Limited | Real estate | 2017 |
| Beachdown Limited | Real estate | 2006 |
| Beacon Park Baptist Church Property Company Limited | Real estate | 2003 |
| Beacon Park Management Company Limited | Households | 1989 |
| Beacon Reach Property Ltd | Real estate | 2025 |
| Beacon Sauna Limited | Transport & logistics | 2026 |
| Beacon South West Limited | Wholesale & retail | 1979 |
| Bealing & Roberts Construction Limited | Wholesale & retail | 1988 |
| Beanos Basket Ltd | Wholesale & retail | 2025 |
| Beans the Ginger Cat Ltd | Wholesale & retail | 2023 |
| Bear Media SW Ltd | Professional & scientific | 2024 |
| Beard and Bones Cosmetics Limited | Wholesale & retail | 2022 |
| Bearded Films Limited | Information & communication | 2015 |
| Beares Construction Ltd | Construction | 2021 |
| Bearing Company Group Ltd | Information & communication | 2026 |
| Bearing Options Limited | Wholesale & retail | 2012 |
| Beataboutmusic Ltd | Arts & recreation | 2025 |
| Beatrice Group Holdings Limited | Financial services | 2023 |
| Beatrice Ltd | Hospitality | 2010 |
| Beatwave Records and Entertainment Ltd | Information & communication | 2025 |
| Beau of Tavistock Limited | Wholesale & retail | 2024 |
| Beaumont Distinguished Ltd | Real estate | 2017 |
| Beaumont Drylining Limited | Construction | 2010 |
| Beaumont Group South West Limited | Construction | 2024 |
| Beaumont Murrayfield Limited | Real estate | 2025 |