| Beespoke Commercial Limited | Financial services | 2024 |
| Bell PD Limited | Real estate | 2021 |
| Bells Sheet Metal Limited | Manufacturing | 2008 |
| Benjamin Pearce Limited | Transport & logistics | 2025 |
| Bennett Recruitment Ltd | Administrative & support | 2013 |
| Bennett Secretarial Services Limited | Administrative & support | 1972 |
| Bennett Staff Ltd | Administrative & support | 2013 |
| Bentinck Road (Flat Management) Limited | Households | 1977 |
| Bernard Mccartney Limited | Wholesale & retail | 1980 |
| Bespoke Lasercutz Limited | Manufacturing | 2017 |
| Best Deals for YOU Ltd | Wholesale & retail | 2022 |
| Beth Fitness Ltd | Professional & scientific | 2026 |
| Betherfly Ltd | Wholesale & retail | 2025 |
| Better Health and Nutrition Ltd | Wholesale & retail | 2013 |
| Beyond Group Holdings Limited | Financial services | 2018 |
| Beyondaxis Ltd | Arts & recreation | 2025 |
| BGA Fabrications and Welding Limited | Manufacturing | 2023 |
| BGI Northern Limited | Arts & recreation | 2011 |
| BGZ Project Solutions Ltd | Administrative & support | 2021 |
| BH Audenshaw Ltd | Financial services | 2017 |
| BH Brahams Ltd | Construction | 2023 |
| Biela Limited | Wholesale & retail | 2021 |
| Big Orange Box Storage Limited | Transport & logistics | 2026 |
| Bikeware UK Ltd | Wholesale & retail | 2023 |
| Biomitigation Ltd | Professional & scientific | 2019 |
| Birch Autos Ltd | Transport & logistics | 2022 |
| Birchy Holdings Limited | Financial services | 2022 |
| BJL Self Storage Limited | Transport & logistics | 2024 |
| BJL Waste Management Limited | Water & waste | 2023 |
| BL Investment Property Limited | Real estate | 2023 |
| Black Forest Security Ltd | Administrative & support | 2019 |
| Blackline Travels Ltd | Transport & logistics | 2025 |
| Blackwell Dane Holdings Ltd | Financial services | 2025 |
| Blazin Buns Ltd | Hospitality | 2024 |
| Blemmings and Blemmings Limited | Administrative & support | 2019 |
| Bling IT UK Limited | Wholesale & retail | 2025 |
| Blmortgagepartners.Com Limited | Financial services | 2026 |
| Bloominluvly Limited | Wholesale & retail | 2024 |
| Bluasia Limited | Wholesale & retail | 2025 |
| Blue DEW Ltd | Health & social care | 2026 |
| Blue Gate Horsebox Hire Ltd | Administrative & support | 2021 |
| Blue Link Properties Ltd | Real estate | 2020 |
| Blue Marble Construction Limited | Construction | 2019 |
| Blueberry Restaurants Ltd | Hospitality | 2025 |
| Blurton’S Butty Bar Ltd | Wholesale & retail | 2020 |
| Bluskye Developments Ltd | Construction | 2022 |
| BM Colour (UK) Limited | Manufacturing | 1996 |
| Bmbl Limited | Real estate | 2023 |
| BMM Maintenance Limited | Construction | 2012 |
| Bocote Services Limited | Health & social care | 2018 |
| Boddicker Games Limited | Information & communication | 2024 |
| Body & Brain Ltd | Education | 2022 |
| Bolt Express Ltd | Transport & logistics | 2025 |
| Bongo's Buildings Limited | Real estate | 2024 |
| Booking Desk Travel Ltd | Administrative & support | 2024 |
| Books Factory Ltd | Manufacturing | 2023 |
| Boon and Blake Ltd | Wholesale & retail | 2020 |
| Booth Financial Management Limited | Professional & scientific | 2010 |
| Bottega Milano Ltd | Wholesale & retail | 2026 |
| Boujee Desserts Company Ltd | Hospitality | 2025 |
| Bovella Limited | Wholesale & retail | 2010 |
| Bowden Cars Ltd | Wholesale & retail | 2017 |
| Bowker Avenue 1970 Limited | Extraterritorial | 2014 |
| Bowles Design Ltd | Professional & scientific | 2023 |
| Boxclever Print & Promotional Ltd | Other services | 2016 |
| Boxd Events Ltd | Manufacturing | 2022 |
| Boyrati Ltd | Wholesale & retail | 2023 |
| Bracken Capital Holdings Ltd | Real estate | 2016 |
| Bradburn Aesthetic Solutions Ltd | Other services | 2025 |
| Bradburn Clinical Solutions Limited | Health & social care | 2016 |
| Bradley Allen Transport Limited | Transport & logistics | 2014 |
| Bradley Home Preservations Ltd | Construction | 2014 |
| Bratasz Marketing Solutions Ltd | Professional & scientific | 2019 |
| Bravura Specialist Painting Contractors Limited | Construction | 2022 |
| Breakfast Bar Takeout Ltd | Hospitality | 2023 |
| Breakfastbarhyde Ltd | Hospitality | 2022 |
| Breckland Scientific Supplies Limited | Administrative & support | 2008 |
| Brian Riley International Limited | Extraterritorial | 2021 |
| Brian's Homes Limited | Real estate | 2022 |
| Bridge Car Company Limited | Wholesale & retail | 1991 |
| Bridgestone Construction Limited | Construction | 2007 |
| Bridgestone Salford Limited | Real estate | 2022 |
| Bright Young Skins Aesthetics and Wellbeing Limited | Wholesale & retail | 2011 |
| Brit Foods Ltd | Hospitality | 2016 |
| Britegroup Health and Safety Limited | Professional & scientific | 2023 |
| BRM Sons Ltd | Wholesale & retail | 2019 |
| Broad Oake Consultancy Services Limited | Professional & scientific | 2023 |
| Broadhurst Group Limited | Professional & scientific | 2020 |
| Broke Bass Limited | Information & communication | 2011 |
| Brooke Steel Group Ltd | Real estate | 2022 |
| Brooks Itiner Limited | Professional & scientific | 2025 |
| Brookson (5378H) Limited | Administrative & support | 2007 |
| Brown & Blond Group Limited | Financial services | 2021 |
| Brown FOX Lifestyle UK Limited | Wholesale & retail | 2025 |
| Brunlea Press Limited | Manufacturing | 2023 |
| BSM Hyde Limitec Limited | Manufacturing | 2024 |
| BTH Solutions Limited | Professional & scientific | 2025 |
| BTL Build Limited | Construction | 2025 |
| BTL Contracts Limited | Construction | 2010 |
| BTL Mechanical and Electrical Limited | Construction | 2025 |