| Blueflame GAS (Yorkshire) Ltd | Administrative & support | 2017 |
| Bluegate Contractors Limited | Construction | 2016 |
| Bluegate Finance Ltd | Financial services | 2022 |
| Bluegate Properties Limited | Real estate | 2016 |
| Bluegen Limited | Real estate | 1996 |
| Bluegiraffetwo Ltd | Real estate | 2016 |
| Bluehaven Holdings Limited | Real estate | 2024 |
| Bluemast Communications Limited | Information & communication | 2014 |
| Blueocto Ltd | Information & communication | 2019 |
| Bluepig Holdings Limited | Construction | 2010 |
| Blueprint Apparel (International) Ltd | Manufacturing | 2024 |
| Blueprint Investment Properties Ltd | Real estate | 2026 |
| Blueprint Jobs Ltd | Administrative & support | 2023 |
| Blueprint Product Solutions Limited | Professional & scientific | 2008 |
| Blueprint Workspace Limited | Real estate | 2011 |
| Bluerock Employment Group Ltd | Health & social care | 2015 |
| Bluerock Healthcare Limited | Health & social care | 2013 |
| Bluesea 777 Ltd | Hospitality | 2018 |
| Bluesky Property Ltd | Real estate | 2019 |
| Bluesmith EOT Limited | Financial services | 2021 |
| Bluesmith Information Systems Limited | Information & communication | 2011 |
| Bluesmith Technology Group Limited | Financial services | 2011 |
| Bluestake | Financial services | 2020 |
| Bluestar Accessories Limited | Wholesale & retail | 2016 |
| Bluestone 1 Limited | Construction | 2009 |
| Bluetit Holdings Limited | Financial services | 2024 |
| Bluewatch Services (UK) Limited | Administrative & support | 2013 |
| Blule PTY Ltd | Wholesale & retail | 2026 |
| Blume Design Group Holdings Ltd | Financial services | 2026 |
| Blurose Intelligence Ltd | Information & communication | 2026 |
| Blush 22 Limited | Other services | 2023 |
| Blutec Group Ltd | Wholesale & retail | 2019 |
| Bluxe Yeadon Limited | Other services | 2026 |
| BLY Consulting Limited | Information & communication | 2025 |
| Blythe Consulting Limited | Information & communication | 2007 |
| Blythe Property Solutions Ltd | Real estate | 2025 |
| Blythe Spirit Consulting Limited | Professional & scientific | 2008 |
| BM Aviation (UK) Ltd | Education | 2012 |
| BM Collectibles Ltd | Wholesale & retail | 2026 |
| BM Crew Ltd | Construction | 2019 |
| BM Motors (Leeds) Limited | Wholesale & retail | 2019 |
| BM Properties Leeds Ltd | Households | 2024 |
| Bmadison Trading Ltd | Financial services | 2024 |
| Bmakwedza Ltd | Transport & logistics | 2026 |
| BMB Assets Limited | Real estate | 2023 |
| BMB Clothing Limited | Wholesale & retail | 2000 |
| BMB Group Limited | Professional & scientific | 2000 |
| BMC Building & Landscapes Ltd | Administrative & support | 2025 |
| BMC Healthcare Services Ltd | Administrative & support | 2023 |
| BMC International Limited | Other services | 2017 |
| BMD Learning Ltd | Professional & scientific | 2018 |
| BMD Print Ltd | Wholesale & retail | 2024 |
| BMF Limited | Construction | 2004 |
| BMF Properties Limited | Real estate | 2025 |
| BMJ Professional Limited | Construction | 2022 |
| BMK Constructions Limited | Construction | 2012 |
| BMK Joinery & Building Ltd | Construction | 2022 |
| BML Logistic Ltd | Transport & logistics | 2020 |
| BML Signs Limited | Manufacturing | 2019 |
| BMM Automotive Ltd | Professional & scientific | 2014 |
| BMR Storage Ltd | Transport & logistics | 2015 |
| BMS Family Property Ltd | Real estate | 2026 |
| BMS Family Protection Ltd | Financial services | 2025 |
| BMS Security and FM Solutions Ltd | Administrative & support | 2024 |
| BMT Film & Media C.I.C. | Information & communication | 2020 |
| Bmtek Limited | Wholesale & retail | 2026 |
| BMZ Communications Limited | Professional & scientific | 2016 |
| BN Store (Leeds) Limited | Wholesale & retail | 2026 |
| BN Surveyors Ltd | Real estate | 2022 |
| Bnar Aesthetics Ltd | Other services | 2023 |
| Bndl Ltd | Information & communication | 2018 |
| Bnet Ltd | Information & communication | 2026 |
| BNF Digital Limited | Wholesale & retail | 2025 |
| BNF Kaizen Enterprise Ltd | Other services | 2025 |
| BNG Enterprises Ltd | Other services | 2025 |
| BNL Group Ltd | Professional & scientific | 2013 |
| BNW Properties (Leeds) Ltd | Real estate | 2024 |
| Bnworks Leeds Ltd | Manufacturing | 2019 |
| BOA Vista Insight Ltd | Professional & scientific | 2017 |
| Boade Agency Ltd | Professional & scientific | 2022 |
| Boag Dolman Financial Planning Ltd | Financial services | 2025 |
| Boag England Financial Planning LLP | | 2014 |
| Boag Holdings Ltd | Other services | 2025 |
| Board Governance Limited | Professional & scientific | 2019 |
| Board Services Ltd | Manufacturing | 2009 |
| Boardpost | Professional & scientific | 1997 |
| Boards (Cottingham) Limited | Wholesale & retail | 1981 |
| Boateng Livings Ltd | Real estate | 2024 |
| Boatmans Wharf (Shipley) Management Company Limited | Households | 2005 |
| BOB Foulkes Professional & Consulting Services Ltd. | Professional & scientific | 2011 |
| BOB Walker Limited | Information & communication | 2019 |
| Boba and BAO Ltd | Hospitality | 2023 |
| Bobbi Barbers Ltd | Other services | 2022 |
| Bobbie Peach Limited | Information & communication | 2008 |
| Bobble Digital Limited | Professional & scientific | 2016 |
| Bobble Insights Ltd | Information & communication | 2024 |
| Bobble Investment Group Ltd | Financial services | 2024 |
| Bobble Properties Limited | Real estate | 2021 |
| Bobby Fowler 1 Ltd | Wholesale & retail | 2023 |
| Bobbys Pizza Ltd | Hospitality | 2024 |