| Bradwell Realty Sourcing Ltd | Administrative & support | 2023 |
| Brady Acquisition Limited | Financial services | 2019 |
| Brady Construction Consultancy Services Limited | Professional & scientific | 2020 |
| Brae Restaurants Ltd | Wholesale & retail | 2018 |
| Braemor Court Limited | Households | 1969 |
| Braendstoft Ltd | Financial services | 2023 |
| Bragacargo Ltd | Transport & logistics | 2025 |
| Bragg Hair Studio Ltd | Other services | 2015 |
| Bragg Marketing Ltd | Professional & scientific | 2025 |
| Bragg Property Ltd | Real estate | 2025 |
| Braidsnco Ltd | Extraterritorial | 2026 |
| Braikenridge Investments Limited | Real estate | 2020 |
| Braila Ltd | Transport & logistics | 2026 |
| Brailsford House Management Company Limited | Households | 2020 |
| Brain and Millard Limited | | 1990 |
| Brain Buddies Limited | Education | 2021 |
| Brain Scran Limited | Arts & recreation | 2019 |
| Brain Tumour Support | Health & social care | 2015 |
| Brainstack.Co.Uk Ltd | Other services | 2025 |
| Brake-Master Limited | Manufacturing | 2022 |
| Brakery Ltd | Hospitality | 2025 |
| Braketesters Ltd | Professional & scientific | 2025 |
| Bralex Transport Ltd | Transport & logistics | 2024 |
| Brambl Ltd | Information & communication | 2026 |
| Bramble Inns LLP | | 2009 |
| Bramble Media Ltd | Information & communication | 2011 |
| Brambles Gold Mine Ltd. | Manufacturing | 2026 |
| Bramdean Property Management Limited | Households | 1987 |
| Bramley Rise Management Company Limited | Construction | 2022 |
| Brampton Mews Limited | Real estate | 1999 |
| Branch & Root Ltd | Extraterritorial | 2025 |
| Branch Brewing Ltd | Manufacturing | 2021 |
| Branch Carpentry Ltd | Construction | 2023 |
| Branch Cider Ltd | Manufacturing | 2021 |
| Branch Structures Limited | Professional & scientific | 2026 |
| Branch-Made Ltd | Manufacturing | 2020 |
| Branchdrink Limited | Real estate | 2001 |
| Branching OUT (Chew Valley) Limited | Agriculture & fishing | 2009 |
| Branchy Properties Limited | Real estate | 2021 |
| Branchy Trading Limited | Professional & scientific | 2006 |
| Brand & Image Concepts Limited | Professional & scientific | 1987 |
| Brand Advisory Ltd | Professional & scientific | 2026 |
| Brand Entrepreneur Limited | Professional & scientific | 2019 |
| Brand Grooves Ltd | Professional & scientific | 2024 |
| Brand Jamaica Ltd | Hospitality | 2024 |
| Brand Name Changes Ltd | Information & communication | 2026 |
| Brand West Ltd | Professional & scientific | 2026 |
| Brande Ltd | Professional & scientific | 2013 |
| Branded Seagulls Ltd | Arts & recreation | 2025 |
| Brandex 1 Bristol Limited | Construction | 2023 |
| Brandex Bristol Limited | Construction | 2013 |
| Brandkandi Ltd | Other services | 2022 |
| Brando Enterprises Ltd | Wholesale & retail | 2022 |
| Brandon Cottage Management Company Limited | Households | 1988 |
| Brandon Park Properties Ltd | Real estate | 2021 |
| Brandon Transport Ltd | Transport & logistics | 2015 |
| Brandon Trust Services Limited | Health & social care | 2021 |
| Brandoria Ltd | Professional & scientific | 2025 |
| Brandpointzero Ltd | Professional & scientific | 2018 |
| Brands in Motion Global Ltd | Professional & scientific | 2025 |
| Brandvox Limited | Information & communication | 2015 |
| Branfeld Ltd | Administrative & support | 2017 |
| Brangwyn Grove Ltd | Administrative & support | 2016 |
| Branq UK Limited | Wholesale & retail | 2018 |
| Brar Estates Ltd | Real estate | 2025 |
| Bras Motorcycle Ltd | Wholesale & retail | 2023 |
| Brass Neck Animation Ltd | Information & communication | 2025 |
| Brassmill Property Company Limited | Real estate | 2020 |
| Braund Housing Limited | Real estate | 2016 |
| Braund Lettings Limited | Hospitality | 2010 |
| Bravaro Solutions Ltd | Real estate | 2025 |
| Brave Hearts Therapeutics Ltd | Information & communication | 2025 |
| Bravechild Limited | Hospitality | 2005 |
| Bravely Ltd | Professional & scientific | 2018 |
| Bravo Charlie's Investments Limited | Real estate | 2016 |
| Bravo Professional Security Ltd | Administrative & support | 2023 |
| Bravo Sierra Accountancy Services Limited | Professional & scientific | 2022 |
| Bravos Kitchen Ltd | Hospitality | 2023 |
| Brawd Pizza Ltd | Hospitality | 2023 |
| Brawndo Ltd | Professional & scientific | 2021 |
| Bray and Slaughter Limited | Construction | 1934 |
| Bray House Veterinary Services Limited | Extraterritorial | 1998 |
| Braybrooke Digital Limited | Information & communication | 2021 |
| Brayley Autos Limited | Extraterritorial | 2015 |
| Braysher Engineering Ltd | Professional & scientific | 2021 |
| Brazil & Poland Fresh Butcher Traditional Groceries Ltd | Wholesale & retail | 2025 |
| Brazil COM Farofa Bristol Ltd | Wholesale & retail | 2018 |
| Brazil Connection Travel Limited | Administrative & support | 2025 |
| BRB Supermarket (Easton) Limited | Wholesale & retail | 2018 |
| BRC Holdings Ltd | Financial services | 2017 |
| BRC Property Ltd | Real estate | 2017 |
| BRE (Brislington) Limited | Construction | 2021 |
| BRE Swindon Limited | Construction | 2020 |
| Breachley Services Limited | Agriculture & fishing | 2010 |
| Bread Line Productions Ltd | Information & communication | 2015 |
| Bread of Life Ministries (Bristol) | Other services | 2008 |
| Breadmaker Limited | Real estate | 2012 |
| Break Down Barriers CIC | Education | 2024 |
| Break the Cage Ltd | Wholesale & retail | 2023 |
| Breaker Point Limited | Arts & recreation | 2019 |