| Boccs Box Limited | Information & communication | 2024 |
| Bodrum Barber Shop Ltd | Other services | 2025 |
| Bodrum Barber SHOP1 Ltd | Other services | 2026 |
| Bodytek Auto Workx Ltd | Wholesale & retail | 2025 |
| Bogentory Ltd | Real estate | 2016 |
| Boiler Serve 4 U Ltd | Construction | 2013 |
| Bologna Haulage Ltd | Construction | 2025 |
| Bolt Healthcare Ltd | Wholesale & retail | 2023 |
| Bonavel Flexible Stone Ltd | Wholesale & retail | 2025 |
| Bookco Limited | Wholesale & retail | 2010 |
| BOOKING247 Limited | Administrative & support | 2022 |
| Bookkeeping Consultancy Ltd | Construction | 2024 |
| Books in a Box Limited | Wholesale & retail | 2025 |
| Born Active Records Limited | Information & communication | 2022 |
| Boss Desserts Ltd | Wholesale & retail | 2025 |
| Boss Direct Limited | Wholesale & retail | 1993 |
| Boss Motors & Maintenance Ltd | Wholesale & retail | 2006 |
| Boss Motors Limited | Wholesale & retail | 2009 |
| Boss Recovery & Transport Ltd | Transport & logistics | 2025 |
| BOT Constructions Ltd | Construction | 2025 |
| Bottom Line Consulting Limited | Administrative & support | 2010 |
| Bouquets.Xa Ltd | Wholesale & retail | 2025 |
| Bourne Medicolegal Limited | Health & social care | 2016 |
| BOUTIQ1 Limited | Wholesale & retail | 2023 |
| Boutique by VEE Ltd | Wholesale & retail | 2023 |
| Bowker Blackburn Limited | Wholesale & retail | 1978 |
| Bowker Properties Limited | Real estate | 2004 |
| Bowker Ribble Valley Limited | Transport & logistics | 2006 |
| Bowness Hospitality Holdings Ltd | Financial services | 2023 |
| BOX4 Digital Group Ltd | Information & communication | 2026 |
| Boxwood Commercials Ltd. | Wholesale & retail | 2015 |
| Boxwood Home Interiors Limited | Wholesale & retail | 2026 |
| BP Roofing Solutions Ltd | Construction | 2025 |
| BP Telecoms Ltd | Other services | 2019 |
| Bpig Limited | Construction | 2025 |
| Bpwe (Holdings) Limited | Financial services | 2019 |
| Bradley Construction Group Limited | Construction | 2026 |
| Bradlow Properties Limited | Real estate | 2006 |
| Bradlow(Darwen)Limited | Real estate | 1969 |
| Braeside Health Ltd | Health & social care | 2026 |
| Brains Digital Solutions Ltd | Information & communication | 2024 |
| Braise Yourself Ltd | Professional & scientific | 2026 |
| Brake Tech Blackburn Limited | Wholesale & retail | 2024 |
| Brake Tech Limited | Wholesale & retail | 2020 |
| Bramm Limited | Other services | 2021 |
| Bramwell Trading Ltd | Hospitality | 2023 |
| Branch OUT Tree Care Ltd | Administrative & support | 2025 |
| Brand New Second Hand Tools Ltd | Wholesale & retail | 2026 |
| Brand Search Limited | Wholesale & retail | 2006 |
| Brand Search Workwear Distribution Limited | Wholesale & retail | 2017 |
| Brand Your Goods Ltd | Administrative & support | 2023 |
| Brand-It NW Ltd | Administrative & support | 2017 |
| BRANDOUTLET2 Ltd | Wholesale & retail | 2026 |
| BRANDS4YOU Ltd | Wholesale & retail | 2025 |
| Brandy House Holdings Limited | Administrative & support | 2017 |
| Brantfell Group Limited | Financial services | 2024 |
| Brantfell Properties Limited | Real estate | 2023 |
| Brave Space Training Ltd | Education | 2026 |
| BRC Realisations Limited | Manufacturing | 1933 |
| BRE Consultants Ltd | Professional & scientific | 2025 |
| Breakell Group Ltd | Financial services | 2024 |
| Breakell Racing Limited | Wholesale & retail | 2006 |
| Breandenk Limited | Other services | 2020 |
| Breightmet Childrens Services Limited | Health & social care | 2024 |
| Brelas Vending Ltd | Hospitality | 2023 |
| Brewers Contractors Limited | Water & waste | 2012 |
| Brian Lister (Light Engineering) Limited | Manufacturing | 2013 |
| Brian Moir Joinery Ltd | Construction | 2014 |
| Bridge Business Solutions (NW) Limited | Professional & scientific | 2011 |
| Bridge Street (Chester) Management Company Limited | Households | 2017 |
| Bridgestone Property Group Limited | Real estate | 2024 |
| Bridgewater Asset Management Ltd | Real estate | 2016 |
| Bridgewater Commercial Construction Limited | Construction | 2025 |
| Bridgewater Loans Ltd | Construction | 2017 |
| Bridgeworth Property Holdings Limited | Financial services | 2026 |
| Bright and Shine Cleaning Ltd | Other services | 2016 |
| Bright Blue Foods Limited | Manufacturing | 2012 |
| Bright Steps Tuition Ltd | Education | 2025 |
| Brighter Futures Day Centres Ltd | Extraterritorial | 2014 |
| Brighter Futures Holdings Limited | Financial services | 2024 |
| Brightway Exports Ltd | Wholesale & retail | 2026 |
| Brightway Investments Limited | Real estate | 2025 |
| Brilliant AI Ltd | Information & communication | 2024 |
| Brilliant Minds (Learning Centres) Preston Ltd | Education | 2025 |
| Brinscall Care Limited | Health & social care | 2018 |
| Brisk Tech Solutions Ltd | Information & communication | 2024 |
| Brit Trading Ltd | Wholesale & retail | 2021 |
| Brita Bathrooms Ltd | Wholesale & retail | 2024 |
| Britannia Inn Oswaldtwistle Limited | Hospitality | 2018 |
| Britannia Mill Properties Limited | Real estate | 2024 |
| Britannia Trading Direct Limited | Wholesale & retail | 2013 |
| Britannia Vehicle Rentals Ltd | Wholesale & retail | 2013 |
| BRITE9 Ltd | Information & communication | 2025 |
| BRITE9IP Ltd | Administrative & support | 2025 |
| Britexpress Couriers Limited | Transport & logistics | 2025 |
| Britian Eco Solutions Limited | Construction | 2024 |
| British Association of Dental Therapists Limited | Other services | 2015 |
| British Capital Offices (Eight) Ltd | Real estate | 2026 |
| British Capital Offices (Eleven) Ltd | Real estate | 2026 |
| British Capital Offices (Five) Ltd | Real estate | 2025 |