| Britanade Cakes Ltd | Manufacturing | 2026 |
| Britecloud Solutions Limited | Information & communication | 2015 |
| British Historic Racing Club Ltd | Arts & recreation | 2025 |
| Briton Ferry (Ivolve) Limited | Health & social care | 2025 |
| Brittain Abrasives Limited | Manufacturing | 2009 |
| Brittania Transport Ltd | Transport & logistics | 2025 |
| BRM Law Limited | Professional & scientific | 2012 |
| BRM Solicitors Limited | Extraterritorial | 2013 |
| Brmco (257) Limited | Financial services | 2022 |
| Brnd WGN Co Limited | Professional & scientific | 2011 |
| Broadband Vantage Limited | Information & communication | 2002 |
| Broadoak Heating and Plumbing Services Limited | Other services | 2017 |
| Brockshill Inn Bar and Restaurant Ltd | Hospitality | 2025 |
| Brockwell Asset Management Ltd | Professional & scientific | 2015 |
| Brockwell Grange Management Company Limited | Hospitality | 2003 |
| Bronwyn Benstead Ltd | Health & social care | 2023 |
| Bronzed Home Tanning Ltd | Administrative & support | 2026 |
| Brookfield (Chesterfield) Management Limited | Real estate | 2013 |
| Brookfield Medical Reports Limited | Health & social care | 2022 |
| Brookholme Croft Ltd | Health & social care | 2012 |
| Brooklyn Innovation Group Ltd | Financial services | 2022 |
| Brooklyn Specialist Services Ltd | Health & social care | 2011 |
| Brooks Shoe Repairs Limited | Other services | 2024 |
| Brookside Consulting Services Ltd | Professional & scientific | 2025 |
| Brookside QS Services Limited | Professional & scientific | 2019 |
| Brookview Homes Management Limited | Health & social care | 2005 |
| Brookview Nursing Home Limited | Health & social care | 1988 |
| Broomhill Farm Boarding Kennels Ltd | Other services | 2021 |
| Broomhill Farm Kennels Ltd | Hospitality | 2016 |
| Broomhill Farm Ltd | Hospitality | 2010 |
| Broseph Holdings 2 Ltd | Wholesale & retail | 2020 |
| Broseph Property Holdings Ltd | Financial services | 2020 |
| Brough Consulting Limited | Professional & scientific | 2018 |
| Brown's Convenience Ltd. | Wholesale & retail | 2014 |
| Brunel Civil Engineering Limited | Professional & scientific | 2016 |
| Bryan Donkin Valves Limited | Manufacturing | 1997 |
| Brymarc Limited | Professional & scientific | 1989 |
| BSS Developments Ltd | Real estate | 2025 |
| BST Retail Limited | Wholesale & retail | 2017 |
| BT Photography Ltd | Professional & scientific | 2021 |
| Btahair Limited | Other services | 2020 |
| BTJ Holdings Ltd | Real estate | 2020 |
| Btjc Ltd | Financial services | 2020 |
| Btra Limited | Professional & scientific | 2024 |
| Bubbly Hand Carwash Limited | Other services | 2020 |
| Buchanan & Co Solicitors Ltd | Professional & scientific | 2012 |
| Buckingham Insurance Consultants Limited | Financial services | 1983 |
| Buddie's Play DEN Ltd | Other services | 2023 |
| Buena Commercial Ltd | Real estate | 2026 |
| Buenabuena Ltd | Real estate | 2017 |
| BUFALOFOODS43 Ltd | Hospitality | 2024 |
| Buford Property Services Ltd | Real estate | 2024 |
| BUG Art Limited | Arts & recreation | 1999 |
| Bugwin Co Ltd | Households | 2025 |
| Building Supplies Ltd | Extraterritorial | 2010 |
| Bulcote Investments Limited | Real estate | 2017 |
| Bulldog Breaks Limited | Hospitality | 2025 |
| Bulldog Macro Advisors Ltd | Arts & recreation | 2021 |
| BUN Hub Burger Limited | Hospitality | 2024 |
| Buntingfield Farm Ltd | Arts & recreation | 2022 |
| Burhan Tech Ltd | Wholesale & retail | 2023 |
| Burlington Place Management Company Limited | Households | 2005 |
| Burlingtons (Chesterfield) Ltd | Other services | 2015 |
| Burrows Brothers (Sales) Limited | Mining & quarrying | 1960 |
| Burrows Conveyor Systems Limited | Construction | 2014 |
| Burrows Pump Sales Limited | Professional & scientific | 2010 |
| Burtech Engineering Services Ltd | Professional & scientific | 2006 |
| Business Accommodation Limited | Real estate | 2022 |
| Business Centrix Ltd | Information & communication | 2011 |
| Business IQ Limited | Information & communication | 2025 |
| Business Loss Prevention Limited | Professional & scientific | 2012 |
| Business of Building UK Ltd | Construction | 2023 |
| Business Protection Services Ltd | Financial services | 2025 |
| Business Sustainability UK Ltd | Professional & scientific | 2024 |
| Businesswise Accountancy and Tax Limited | Professional & scientific | 2017 |
| Businesswise Limited | Administrative & support | 2013 |
| Businesswise Turnaround and Growth Consultancy Limited | Professional & scientific | 2015 |
| Butler Haulage Ltd | Transport & logistics | 2022 |
| Butterfly Elysian Limited | Information & communication | 2022 |
| Butterfly Property Services Limited | Real estate | 2017 |
| Butterley Holdings Limited | Administrative & support | 2025 |
| Bvissamsetti Ltd | Health & social care | 2021 |
| BVM Matlock Limited | Real estate | 2021 |
| C & B Interiors Ltd | Construction | 2022 |
| C & D Electrical Contractors Limited | Construction | 2007 |
| C & D Fabrication Limited | Manufacturing | 2003 |
| C & D Trust Limited | Financial services | 2025 |
| C & G Assessments and Training Limited | Education | 2003 |
| C & G Recruitment Limited | Extraterritorial | 2007 |
| C & G Training Solutions Limited | Education | 2010 |
| C & H Investments Limited | Construction | 2004 |
| C & I M Design Limited | Information & communication | 1997 |
| C & J Catering Ltd | Hospitality | 2019 |
| C & K Smart Homes Limited | Real estate | 2021 |
| C & S Footwear Adaptions Limited | Manufacturing | 2002 |
| C B M R Limited | Construction | 2016 |
| C Bradley Tattooing Ltd | Other services | 2003 |
| C D Bricknell Property Ltd | Construction | 2025 |
| C E Geochem Ltd | Professional & scientific | 2013 |
| C J Schofield Electrical Limited | Construction | 2014 |