| Blueedge Transport Ltd | Transport & logistics | 2025 |
| Bluefin Holdings NW Ltd | Financial services | 2025 |
| Bluegrain Ltd | Administrative & support | 2011 |
| Blueprint for Change Ltd | Professional & scientific | 2022 |
| Bluesafe Ltd | Professional & scientific | 2018 |
| Bluestar Packaging Supplies Limited | Wholesale & retail | 2009 |
| Bluewave Clean Ltd | Administrative & support | 2023 |
| Bluline Ltd | Professional & scientific | 2001 |
| Blupulse Ltd | Administrative & support | 2026 |
| Blush Beauty Corp Limited | Other services | 2025 |
| Blush Bridalwear Limited | Wholesale & retail | 2008 |
| Blythe Valley Dental Ltd | Health & social care | 2023 |
| Bmdc Accountancy Ltd | Professional & scientific | 2013 |
| BND Motors Limited | Wholesale & retail | 2011 |
| Bnl-Ro Ltd | Wholesale & retail | 2024 |
| BNS Autosalvage (Oldham) Limited | Wholesale & retail | 2017 |
| BNS Hussein Ltd | Other services | 2025 |
| Bnsl Limited | Hospitality | 2019 |
| Boardway Super Stores Ltd | Wholesale & retail | 2026 |
| Boarshurst Building Contractors Limited | Construction | 2005 |
| BOB Motorz Ltd | Wholesale & retail | 2026 |
| BOB the Builder (UK) Limited | Construction | 2003 |
| Bodies by Merj Ltd | Other services | 2022 |
| Body Contour London Ltd | Other services | 2023 |
| Bohemian Enterprises NW Ltd | Hospitality | 2025 |
| Boithok Khana Ltd | Hospitality | 2024 |
| Bollywood NW Ltd | Wholesale & retail | 2006 |
| Bolton Salvage Parts Limited | Wholesale & retail | 2026 |
| Bombai Manchester Limited | Hospitality | 2021 |
| Bonanza Carpets and Beds Ltd | Wholesale & retail | 2026 |
| Boneyardco Ltd | Administrative & support | 2025 |
| Bonni Fashions Ltd | Wholesale & retail | 2019 |
| Bookrx Ltd | Health & social care | 2024 |
| Books and Tea Ltd | Real estate | 2025 |
| Bookworm Translations Limited | Administrative & support | 2008 |
| Boom Logistics Limited | Transport & logistics | 2024 |
| Boon Inn UK Ltd | Hospitality | 2025 |
| Boonma Ltd | Health & social care | 2026 |
| Boost Skills Ltd | Professional & scientific | 2025 |
| Boosted Lane Ltd | Wholesale & retail | 2024 |
| Booth Hill Demolition Limited | Construction | 2015 |
| Booth Plumbing & Heating Solutions Ltd | Construction | 2024 |
| Booth's Properties Limited | Real estate | 2019 |
| Boothman Properties Limited | Real estate | 2018 |
| Bopnbounce Ltd | Arts & recreation | 2023 |
| Border Commercial Vehicles Ltd | Wholesale & retail | 2008 |
| Borderfree Properties UK Limited | Real estate | 2022 |
| Borough Taxis (Royton) Limited | Transport & logistics | 2012 |
| Bosal Travels Ltd | Transport & logistics | 2022 |
| Boss 20 Limited | Wholesale & retail | 2026 |
| Bossmans Kitchen (Oldham) Ltd | Hospitality | 2025 |
| Bostec Automation Ltd | Other services | 2025 |
| Bostec Group Ltd | Other services | 2025 |
| Bostec Limited | Professional & scientific | 2019 |
| Botany House Limited | Health & social care | 2003 |
| Bottina Ltd | Administrative & support | 2025 |
| Bowbridal Limited | Wholesale & retail | 2015 |
| Bowcliffe Solutions Limited | Construction | 2014 |
| Bowden Cable Supplies Limited | Wholesale & retail | 1978 |
| Bower Cars and Parts Ltd | Wholesale & retail | 2024 |
| Bower Property Investments Limited | Real estate | 2006 |
| Bowex Ltd | Households | 2025 |
| Bowl Online Ltd | Information & communication | 2014 |
| Box Media Walls Ltd | Professional & scientific | 2025 |
| Boxpic Limited | Construction | 2019 |
| BP Events and Caterings Ltd | Hospitality | 2026 |
| BP Harrogate Ltd | Other services | 2026 |
| BPG Contractors Limited | Construction | 2012 |
| Bracknell Holdings Limited | Real estate | 2023 |
| Bracknell Lettings Limited | Real estate | 2023 |
| Bradbury Plumbing & Heating Limited | Construction | 2024 |
| Bradford Garage Car Sales Ltd | Wholesale & retail | 2022 |
| Bradford Music Month Ltd | Arts & recreation | 2024 |
| Bradley Fold Management Company Limited | Professional & scientific | 2007 |
| Bradley's Plumbing Services Ltd | Construction | 2023 |
| Bradleys Plumbing, Heating & Building Services Limited | Construction | 2005 |
| Bradleys Property Group Ltd | Construction | 2026 |
| Brain Fuel Academy Limited | Education | 2026 |
| Brakott Limited | Information & communication | 2015 |
| Branch Consult Ltd | Professional & scientific | 2023 |
| Brand Central Limited | Wholesale & retail | 2025 |
| Brand Installations NW Ltd | Construction | 2023 |
| Branded Bathrooms Ltd | Administrative & support | 2025 |
| Branded by Codie Ltd | Wholesale & retail | 2026 |
| Brandon Landscapes Ltd | Administrative & support | 2026 |
| Brandspire Media Limited | Professional & scientific | 2025 |
| Brantwood Court RTM Company Limited | Households | 2017 |
| Braveline Ltd | Hospitality | 2019 |
| Bray Preservation Services Ltd | Construction | 2009 |
| Brayangroup Ltd | Administrative & support | 2025 |
| Brazil Leisure Ltd | Hospitality | 2026 |
| Brazoo Ltd | Wholesale & retail | 2026 |
| Breachstone Properties Ltd | Real estate | 2026 |
| Break to Build Ltd | Other services | 2023 |
| Breakdown Music Productions Ltd | Arts & recreation | 2018 |
| Breakey & Nuttall Limited | Professional & scientific | 2021 |
| Breakfast Kitchen Limited | Hospitality | 2024 |
| Breakforth Evangelical Church and Ministry Ltd | Education | 2009 |
| Brears Bespoke Building Limited | Construction | 2019 |
| Bred Ltd | Wholesale & retail | 2023 |