| Blue Wealth Capital Limited | Professional & scientific | 2011 |
| Blue Wolf Empire Ltd | Manufacturing | 2020 |
| Bluebell Wood Children's Hospice | Health & social care | 1999 |
| Bluebird Caravans Limited | Manufacturing | 1998 |
| Bluebird Gardening Limited | Administrative & support | 2014 |
| Bluebridgehousing Ltd | Real estate | 2024 |
| BLUECUBE3D Ltd | Professional & scientific | 2024 |
| Bluefields Properties SPV Limited | Real estate | 2022 |
| Blueforge Holdings Ltd | Financial services | 2025 |
| Bluegrove Estates Ltd | Real estate | 2021 |
| Bluehills Property Holdings Ltd | Real estate | 2026 |
| Bluejay Consultancy Ltd | Information & communication | 2023 |
| Bluejay Living Limited | Real estate | 2025 |
| Bluekelton Ltd | Professional & scientific | 2021 |
| Blueone Facilities Management Ltd | Administrative & support | 2017 |
| Blueprint Property Management Limited | Real estate | 2003 |
| Blueprint Survey & Design Limited | Professional & scientific | 2009 |
| BLUEPRINT19 Ltd | Information & communication | 2022 |
| Blueprints Design Ltd. | Real estate | 2018 |
| Blues Explosion Ltd | Arts & recreation | 2024 |
| Bluestone Abbey Management Limited | Real estate | 2022 |
| Bluestone Consumer Finance Limited | Administrative & support | 1971 |
| Bluestone Credit Management Limited | Extraterritorial | 2019 |
| Bluestone Motors Ltd | Wholesale & retail | 2017 |
| Bluestone Retail Finance Limited | Extraterritorial | 2012 |
| Bluestream Academy Ltd | Information & communication | 2012 |
| Bluetrail Software Limited | Information & communication | 2024 |
| Bluette Limited | Professional & scientific | 2023 |
| Blum Floral Limited | Wholesale & retail | 2023 |
| Blunewt Ltd | Professional & scientific | 2021 |
| Blushes Limited | Wholesale & retail | 1993 |
| Bluueer Services Ltd | Manufacturing | 2024 |
| BLV24 Limited | Arts & recreation | 2020 |
| BLV24 Live Limited | Information & communication | 2020 |
| BLW Group Ltd | Extraterritorial | 2023 |
| BLW Property Services Ltd | Real estate | 2022 |
| Blynk Security Services Ltd | Administrative & support | 2025 |
| Blyth Currys Ltd | Hospitality | 2025 |
| Blyth Group Limited | Wholesale & retail | 1986 |
| Blyth Metals Limited | Wholesale & retail | 1981 |
| BM Development Services Ltd. | Real estate | 2016 |
| BM Foods Solutions Ltd | Wholesale & retail | 2024 |
| BM Kuna Property Developments Limited | Financial services | 2010 |
| BM Rentwise Limited | Real estate | 2025 |
| BM Wolf Ltd | Construction | 2021 |
| Bm.Wolverhampton Limited | Wholesale & retail | 2023 |
| BM4 Consultants Limited | Professional & scientific | 2009 |
| BMB Investments (Sheff) Ltd | Real estate | 2020 |
| BMB Urban Solutions Ltd | Construction | 2015 |
| Bmei Services Limited | Professional & scientific | 2013 |
| BMF Developments Limited | Real estate | 2016 |
| BMH Solutions Ltd | Other services | 2021 |
| BMH Supplies Ltd | Wholesale & retail | 2019 |
| BMN Trading Ltd | Wholesale & retail | 2017 |
| Bmparts.Co.Uk South Yorkshire Limited | Wholesale & retail | 2011 |
| Bmpconsulting Limited | Professional & scientific | 2024 |
| BMS Engineering Services Limited | Professional & scientific | 2025 |
| Bmth Merch Limited | Wholesale & retail | 2014 |
| Bmth Music Limited | Arts & recreation | 2013 |
| Bmth Touring Limited | Arts & recreation | 2013 |
| BMV1 Ltd | Real estate | 2013 |
| Bnar Ltd | Health & social care | 2019 |
| BNC Consultancy Limited | Professional & scientific | 2021 |
| Bnhaa Ltd | Real estate | 2025 |
| BNM Accommodations Ltd | Real estate | 2022 |
| BNM S&P Ltd | Hospitality | 2026 |
| BNV Ltd | Information & communication | 2022 |
| BNY Yorkshire Limited | Professional & scientific | 2002 |
| BNZ Services Limited | Transport & logistics | 2020 |
| Bo-Mac (Sheffield) Limited | Manufacturing | 1979 |
| Boah Investments Ltd | Real estate | 2021 |
| Boaliy Limited | Other services | 2024 |
| Boar Lane Hairdressing Limited | Wholesale & retail | 2015 |
| Boardman Recruitment Limited | Administrative & support | 2013 |
| Boathouse Social | Hospitality | 2021 |
| Boatman Property Investments Ltd | Real estate | 2022 |
| Boatugolf 2020 Limited | Professional & scientific | 2015 |
| BOB Accounts Limited | Professional & scientific | 2024 |
| BOB Cafe Ltd | Hospitality | 2019 |
| Bob's Boxes Ltd | Administrative & support | 2021 |
| Bob's Your Uncle Limited | Arts & recreation | 2003 |
| Bobacafe Limited | Hospitality | 2026 |
| Bobandboe Limited | Hospitality | 2020 |
| Bobbi Group Limited | Information & communication | 2024 |
| Bobbi's Beans Ltd | Hospitality | 2023 |
| Bobble HAT Sound Limited | Information & communication | 2019 |
| Bobo EP Limited | Hospitality | 2019 |
| Bocking Lane Ltd | Construction | 2026 |
| Boco Consulting Ltd | Professional & scientific | 2019 |
| BOD & Sons Ltd | Health & social care | 2024 |
| BOD GAS UK Ltd | Construction | 2009 |
| Bod-Ink Ltd | Arts & recreation | 2025 |
| Bodo's Logistics Ltd | Transport & logistics | 2022 |
| Bodr Electric Ltd | Wholesale & retail | 2024 |
| Body 'N' Soul Ltd | Arts & recreation | 2014 |
| Body and Soul Retreat Ltd | Other services | 2021 |
| Body Boss UK Ltd | Education | 2025 |
| Body by Alycia Ltd | Education | 2024 |
| BODY365 Ltd | Education | 2026 |
| Bodyactive (Leeds) Limited | Wholesale & retail | 2004 |