| Breit Aesthetics Limited | Wholesale & retail | 2011 |
| Breitway Homes Limited | Real estate | 2007 |
| Bretelec Ltd | Construction | 2014 |
| Bretelex Ltd | Construction | 2025 |
| Breva Bridge Card Game Ltd | Information & communication | 2009 |
| Brewer Mortgage Advice Limited | Financial services | 2024 |
| Brewsters Signs Limited | Arts & recreation | 2004 |
| Brian Fish Properties Ltd | Construction | 2022 |
| Brians Carpets Ltd | Wholesale & retail | 2022 |
| Brick Ledger Ltd | Information & communication | 2025 |
| Brickoven Media Video Production Limited | Information & communication | 2023 |
| Bricks Real Estate NW Ltd | Real estate | 2025 |
| Bricksetters Ltd | Wholesale & retail | 2016 |
| Bridge Harmony Ltd | Administrative & support | 2025 |
| Bridge Retail Ltd | Manufacturing | 2025 |
| Bridge to Belonging Limited | Education | 2026 |
| Bridgefield Court Management Company (Prescot) Limited | Real estate | 2007 |
| Bridgehousing Construction Ltd | Construction | 2024 |
| Bridges Property Management LLP | | 2016 |
| Bridgestones Limited | Administrative & support | 2001 |
| Bridgewater Children’S Care Services Ltd | Health & social care | 2023 |
| Bridgewater House Ltd | Financial services | 2024 |
| Bridgewater Strategies Limited | Wholesale & retail | 2025 |
| Bridging the GAP Ltd | Health & social care | 2005 |
| Bridging the GAP Oldham Ltd | Health & social care | 2026 |
| Brig Flooring Co Ltd | Construction | 2025 |
| Briggs Property Management Ltd | Real estate | 2025 |
| Bright Futures School Limited | Education | 2012 |
| Bright Lanterns Therapeutic and Residential Services Ltd | Health & social care | 2024 |
| Bright Method Ltd | Administrative & support | 2025 |
| Brighter Energy Solutions (UK) Ltd | Professional & scientific | 2024 |
| Brighter Solutions UK Ltd | Construction | 2022 |
| Brightissue Holdings Limited | Professional & scientific | 2019 |
| Brightlight Accountancy Services Limited | Professional & scientific | 2009 |
| Brightline Cleaning Limited | Administrative & support | 2026 |
| Brightside Property Solutions Ltd | Extraterritorial | 2012 |
| Brightside Solutions Ltd | Wholesale & retail | 2010 |
| Brightsmith Way Management Company Limited | Households | 2013 |
| Brightstart Day Nursery Group Limited | Professional & scientific | 2016 |
| Brilliant Customer Services Ltd | Extraterritorial | 2025 |
| Bring IT on Social Ltd | Professional & scientific | 2016 |
| Brisky Bytes Ltd | Wholesale & retail | 2025 |
| Brit Dinosaur Ltd | Wholesale & retail | 2025 |
| Brit Health Care Ltd | Health & social care | 2024 |
| Britannia Asset Group Ltd | Construction | 2025 |
| Britannia GAS Limited | Wholesale & retail | 2010 |
| Britannia Scientific Instruments Limited | Manufacturing | 2017 |
| Brithish Vintage Ltd | Wholesale & retail | 2024 |
| Brits Healthcare Ltd | Public administration | 2023 |
| Broad ING Limited | Professional & scientific | 2017 |
| Broad Lane Consulting Ltd | Real estate | 2014 |
| Broad Smiles Limited | Health & social care | 2018 |
| Broadbent Services Limited | Extraterritorial | 2019 |
| Broadlea Developments Limited | Extraterritorial | 2013 |
| Broadmark Doors Limited | Manufacturing | 2021 |
| Broadmeadow Equestrian Ltd | Agriculture & fishing | 2018 |
| Broadway Barks & Bubbles Ltd | Other services | 2022 |
| Broadway Care Services Ltd | Education | 2024 |
| Broadway Day Nursery Limited | Education | 2015 |
| Broadway Dog Grooming Academy Ltd | Other services | 2023 |
| Broadway Medicals Ltd | Health & social care | 2018 |
| Broadway News Oldham Ltd | Wholesale & retail | 2014 |
| Broadway NW Ltd | Administrative & support | 2017 |
| Broadway Park Homes Ltd | Hospitality | 2015 |
| Brock Business Support Ltd | Administrative & support | 2016 |
| Brofield Properties Ltd | Real estate | 2020 |
| Brogram Ltd | Arts & recreation | 2023 |
| Broken Halo Limited | Manufacturing | 2025 |
| Brokenpencil Limited | Professional & scientific | 2003 |
| Brompton Groundcare Machinery Ltd | Manufacturing | 2024 |
| Brompton Groundcare Services Ltd | Manufacturing | 2016 |
| Brook & Burgess Limited | Real estate | 1946 |
| Brook & Wilde Sleep Limited | Manufacturing | 2023 |
| Brooke Trading Limited | Information & communication | 2021 |
| Brookfield Avenue 1957 Limited | Extraterritorial | 2015 |
| Brookfield House RTM Company Limited | Households | 2022 |
| Brooklands Cheshire Ltd | Construction | 2015 |
| Brooklands NO. 1 Limited | Professional & scientific | 1994 |
| Brooklyn Imports Ltd | Wholesale & retail | 2006 |
| Brooks & Brooks Care Ltd | Administrative & support | 2020 |
| Brooks & Brooks Group Limited | Financial services | 2024 |
| Brooks & Brooks Recruitment Limited | Administrative & support | 2015 |
| Brooks & Hewitt Properties Ltd | Real estate | 2020 |
| Brooks Security Services Ltd | Administrative & support | 2022 |
| Brooks Shot Ltd | Wholesale & retail | 2024 |
| Brothers Logistics Limited | Wholesale & retail | 2022 |
| Brothers Tasty Food Limited | Hospitality | 2012 |
| Brotherton Park Homes Limited | Hospitality | 2018 |
| Broughton Associates Ltd | Health & social care | 2020 |
| Brow Game Limited | Other services | 2023 |
| Browco Ltd | Real estate | 2015 |
| Brown Street Motors Ltd | Wholesale & retail | 2019 |
| BROWS4BADDIEZ Ltd | Other services | 2024 |
| Broxswood Estates Limited | Real estate | 2023 |
| Brpc Ltd | Other services | 2026 |
| Brta Limited | Professional & scientific | 2020 |
| Bru'D Awakenin's Ltd | Hospitality | 2024 |
| Bru'D Bar Limited | Hospitality | 2022 |
| Brucks Ltd | Professional & scientific | 2019 |
| Brundrit Limited | Professional & scientific | 2013 |