| Booker UK Limited | Administrative & support | 2001 |
| Bookkeepers Direct Limited | Extraterritorial | 2012 |
| Boost Limit Development Limited | Other services | 2021 |
| Booth Waterhouse Ltd | Information & communication | 2012 |
| Borisa Solutions Limited | Health & social care | 2014 |
| Born 2 Deliver 4U Ltd | Transport & logistics | 2021 |
| Borough of Barnsley Swimming Club Limited | Arts & recreation | 2026 |
| Borza Delivery Ltd | Transport & logistics | 2022 |
| BOS Design & Print Ltd | Manufacturing | 2023 |
| BOS Office Supplies Group Ltd. | Wholesale & retail | 1974 |
| Bosca Brothers Ltd | Transport & logistics | 2024 |
| Bosca Express Ltd | Transport & logistics | 2025 |
| Bose Logistics Limited | Transport & logistics | 2018 |
| Boss Asset Holdings Limited | Administrative & support | 2023 |
| Boss Hydroponics Limited | Wholesale & retail | 2013 |
| Boss Industrial Doors Limited | Manufacturing | 2023 |
| Boswell Residential Ltd | Real estate | 2025 |
| Botanical Perfumery Limited | Manufacturing | 2026 |
| Boutique Build and Construction Ltd | Construction | 2026 |
| Boutique Lets Ltd | Real estate | 2023 |
| BOX2BOX Sports Media Ltd | Manufacturing | 2024 |
| Boxing Science Ltd | Wholesale & retail | 2017 |
| Boxing Science Online Ltd | Education | 2021 |
| Boxxed Events Ltd | Extraterritorial | 2025 |
| Boylan Roofing Company Limited | Construction | 2010 |
| Boylin Commercial Limited | Extraterritorial | 2013 |
| Boylin Handling Limited | Extraterritorial | 2018 |
| Boylin Holdings Limited | Transport & logistics | 2016 |
| Boylin's Selfstore (Barnsley) Limited | Extraterritorial | 2013 |
| Boylin's Selfstore (Bradford) Limited | Real estate | 2014 |
| Boylin's Selfstore (Carlton) Limited | Extraterritorial | 2018 |
| Boylin's Selfstore (Leeds) Limited | Transport & logistics | 2013 |
| Boylin's Selfstore (Sheffield) Limited | Extraterritorial | 2013 |
| Boylin's Selfstore (Swinton) Limited | Transport & logistics | 2014 |
| Boylin's Selfstore (Wakefield RD) Limited | Transport & logistics | 2017 |
| Boylin's Selfstore (Wakefield) Limited | Transport & logistics | 2013 |
| Boylin's Selfstore Limited | Transport & logistics | 2011 |
| Boylin’S Selfstore (Agbrigg Road) Limited | Extraterritorial | 2021 |
| Bozek Ltd | Transport & logistics | 2017 |
| BP Food and Wine Ltd | Wholesale & retail | 2026 |
| Bpmes Ltd | Professional & scientific | 2020 |
| BPS53 Brian Seaman Consultancy Ltd | Construction | 2025 |
| Brad Cutler Ltd | Construction | 2025 |
| Braithwaite Demolitions Limited | Administrative & support | 2007 |
| Braithwaite Excavations Holdings Limited | Professional & scientific | 2005 |
| Braithwaite Excavations Limited | Construction | 2002 |
| Braithwaite Mews Management Ltd | Real estate | 2003 |
| Bramham Accountancy Services Limited | Professional & scientific | 2011 |
| Brampton Mini Shop Ltd | Wholesale & retail | 2026 |
| Brampton Road Tyre Shop Ltd | Wholesale & retail | 2025 |
| Branchwater Developments Limited | Real estate | 2004 |
| Brando Holdings Limited | Financial services | 2021 |
| Brando Services Limited | Transport & logistics | 1999 |
| Brandon Glazzard Ltd | Construction | 2025 |
| Brass Bands England | Arts & recreation | 2012 |
| Brasserie 21 Ltd | Hospitality | 2021 |
| Brassneck Limited | Professional & scientific | 2016 |
| Bratana Garage Ltd | Wholesale & retail | 2020 |
| Brave Humour Ltd | Professional & scientific | 2020 |
| Braveheart Academic Seed Funding GP Limited | Administrative & support | 2009 |
| BRE Transport Limited | Transport & logistics | 2022 |
| Breathe Pilates Limited | Arts & recreation | 2025 |
| Breathing Equipment Hire Limited | Professional & scientific | 1989 |
| Brebur Group Ltd | Financial services | 2024 |
| Brebur Holdings Ltd | Financial services | 2024 |
| Brebur Ltd | Construction | 2002 |
| Brebur Services Ltd | Financial services | 2012 |
| Brekka Creative Limited | Professional & scientific | 2019 |
| Brennan Johnson Consulting Limited | Professional & scientific | 2022 |
| Bretton Reed Smith Limited | Professional & scientific | 2007 |
| Brew Chest Limited | Wholesale & retail | 2016 |
| Brewer & Bunney Limited | Manufacturing | 1998 |
| Brewery Wharf (Sheffield) Management Company Limited | Real estate | 2004 |
| Brian Totty Signs & Design Limited | Manufacturing | 1981 |
| Brick Stays Ltd | Real estate | 2026 |
| Bricks & Badger Ltd | Real estate | 2025 |
| Bricks and Equity Limited | Real estate | 2024 |
| Bridge Education and Training Limited | Administrative & support | 2014 |
| Bridge Medical Solutions Ltd | Health & social care | 2012 |
| Brierley Road Hand Car Wash Ltd | Administrative & support | 2025 |
| Bright Beginnings (Barnsley) Limited | Health & social care | 2023 |
| Bright Box Makerspace | Education | 2017 |
| Bright House Solar Limited | Construction | 2023 |
| Bright Light Entertainment Ltd | Arts & recreation | 2016 |
| Bright-Worx Ltd | Administrative & support | 2015 |
| Brightlight Enterprises Ltd | Professional & scientific | 2023 |
| Brightsmart Trading Ltd | Wholesale & retail | 2025 |
| Brightteach Group Limited | Financial services | 2024 |
| Brightteach Ltd | Education | 2016 |
| Brightteach Study Limited | Education | 2024 |
| Brikwise Ltd | Real estate | 2017 |
| Brindley Cladding Services Limited | Construction | 2021 |
| Bris Developments Ltd | Real estate | 2022 |
| Brite Property Ltd | Real estate | 2022 |
| British Flowerpots Limited | Manufacturing | 2023 |
| Brittplant Contracting Services Ltd | Construction | 2026 |
| BRL Builders Limited | Construction | 2022 |
| BRL Transport Ltd | Transport & logistics | 2021 |
| BRM Ltd | Hospitality | 2025 |
| Broad Services Ltd | Information & communication | 2022 |