| Bramley Property Services Ltd | Real estate | 2024 |
| Bramley Vending Limited | Hospitality | 1998 |
| Brammar Ltd | Construction | 2025 |
| Brammer Estates Limited | Real estate | 1991 |
| Brampton Finance Limited | Professional & scientific | 2023 |
| Bramwell Gardens Limited | Households | 1999 |
| Bramwell Relocation Limited | Transport & logistics | 2021 |
| Branch Line Society | Other services | 2025 |
| Brand Consultancy UK Ltd | Wholesale & retail | 2019 |
| Brand N Deliver Limited | Arts & recreation | 2016 |
| Brand New Search Limited | Administrative & support | 2009 |
| Brand North Limited | Professional & scientific | 2023 |
| Brandbeats Limited | Professional & scientific | 2012 |
| Brandcass Consulting Ltd | Professional & scientific | 2017 |
| Brandfresh Limited | Manufacturing | 2010 |
| Brandheat Ltd | Information & communication | 2025 |
| Brandon Carr Racing Limited | Arts & recreation | 2020 |
| Brandsley Ltd | Administrative & support | 2008 |
| Brandy Services Limited | Hospitality | 2025 |
| Branston Residential Ltd | Real estate | 2020 |
| Bransum Estates Limited | Construction | 1981 |
| Branthera Ltd | Professional & scientific | 2024 |
| Brask and Cece Holdings Limited | Financial services | 2013 |
| Brass Founders (Sheffield) Limited | Manufacturing | 1919 |
| Brass Mill Media Ltd. | Information & communication | 2018 |
| Brasshound Ltd | Arts & recreation | 2013 |
| Brassica Ltd | Hospitality | 2018 |
| Brassmail Limited | Professional & scientific | 1998 |
| BRASSTWENTY25 Ltd | Hospitality | 2025 |
| Bravecliq Consults Limited | Information & communication | 2025 |
| Braveheart Resources (UK) Limited | Wholesale & retail | 2023 |
| Bravehearts Child Care Ltd | Health & social care | 2025 |
| Brayan Supermarket Ltd | Wholesale & retail | 2025 |
| Brazing Products Limited | Wholesale & retail | 2009 |
| Brazza Services Ltd | Wholesale & retail | 2025 |
| Bread Just-In Ltd | Manufacturing | 2026 |
| Breakaway Entertainment Ltd | Arts & recreation | 2012 |
| Breaker Breaker Recordings Ltd | Information & communication | 2014 |
| Breakout Self - Defence CIC | Other services | 2025 |
| Breakthrough Advocacy & Support Ltd | Health & social care | 2022 |
| Breakthrough Basements Ltd | Construction | 2017 |
| Brearley Bear Media Ltd | Administrative & support | 2021 |
| Brearley Forge Management Company Limited | Real estate | 2013 |
| Breast Doctor Ltd | Health & social care | 2023 |
| Breath Performance LAB Ltd | Professional & scientific | 2026 |
| Breathe Classical Pilates Limited | Arts & recreation | 2021 |
| Breathe Home Interiors (UK) Ltd | Wholesale & retail | 2007 |
| Breathe Resuscitation Training Limited | Health & social care | 2020 |
| Breathway Labs Limited | Information & communication | 2025 |
| Bredbury Hall Limited | Hospitality | 2021 |
| Bredbury Hall Propco Limited | Professional & scientific | 2021 |
| Bree Baur Sudanese CIC | Health & social care | 2026 |
| Breeeze Limited | Wholesale & retail | 2023 |
| Breeosh Ltd | Manufacturing | 2022 |
| Breet and Toss UK Ltd | Wholesale & retail | 2025 |
| Breezy Aspen Ltd | Hospitality | 2023 |
| Breitenfeld UK Limited | Manufacturing | 1988 |
| Brennan Taff Ltd | Administrative & support | 2018 |
| Brenthale Limited | Wholesale & retail | 2011 |
| BRENTRANS1 Ltd | Transport & logistics | 2021 |
| Brentwood Tennis Club Limited | Arts & recreation | 2012 |
| Brenvo Core Limited | Wholesale & retail | 2026 |
| Bresbet Ltd | Arts & recreation | 2021 |
| Bresbet Oncourse Ltd | Arts & recreation | 2024 |
| Bresbuild Ltd | Construction | 2021 |
| Brescollect Ltd | Wholesale & retail | 2017 |
| Brescorp Ltd | Administrative & support | 2021 |
| Brestek Ltd | Information & communication | 2022 |
| Brett & Bailey Limited | Information & communication | 2021 |
| Brett's Group Ltd | Wholesale & retail | 2016 |
| Brettmorrisonltd@Outlook.Com Ltd | Transport & logistics | 2026 |
| Bretton Mechanical Services Limited | Construction | 2004 |
| Brevere Road Management Company Limited | Real estate | 1996 |
| Brew & Bloom Ltd | Professional & scientific | 2024 |
| Brew and Tucker Limited | Hospitality | 2015 |
| Brew School Limited | Education | 2014 |
| Brew Your Brand Ltd | Extraterritorial | 2019 |
| Brewbench Limited | Hospitality | 2025 |
| Brewfame Limited | Professional & scientific | 1981 |
| Brewfuel Limited | Hospitality | 2025 |
| Brewkitchen Limited | Hospitality | 2007 |
| Brewster Investment Group Ltd | Financial services | 2020 |
| Brewster UK Property Sourced Ltd | Real estate | 2020 |
| BRG Hire Company Limited | Administrative & support | 2013 |
| BRG Projects Limited | Administrative & support | 2017 |
| Brgr Street Ltd | Hospitality | 2025 |
| Brian Catherwood Ltd | Construction | 2005 |
| Brian FOX & Sons Roofing Limited | Construction | 2005 |
| Brian Kaye Transport Ltd | Transport & logistics | 2007 |
| Brian N Construction Ltd | Construction | 2013 |
| Brian Stones Delivery Ltd | Transport & logistics | 2026 |
| Brian W. Walton and SON Limited | Construction | 1989 |
| Briar Vets Ltd | Professional & scientific | 2017 |
| Bric a Brac Ltd | Wholesale & retail | 2022 |
| Brick Overload Ltd | Wholesale & retail | 2022 |
| Brick Work and Things Ltd | Construction | 2025 |
| Brick Work Brick Cleaning Chimneys Decorative Brickwork Garden Walls Pointing and Repointing Repairs and Restoration Limited | Construction | 2025 |
| Bricklayers Arms Boston Ltd | Hospitality | 2024 |
| Brickout Ltd | Wholesale & retail | 2025 |
| Bricks, Boxes & Biscuits Ltd | Transport & logistics | 2026 |