| Birstall.Co.Uk Limited | Real estate | 1997 |
| Biryani Centre Limited | Hospitality | 2018 |
| Biryani's & Grill Ltd | Hospitality | 2025 |
| Biryanipediauk Ltd | Hospitality | 2025 |
| Biryanis World Ltd | Hospitality | 2026 |
| Biryaniwala Caterers Limited | Hospitality | 2023 |
| Biryaniwala Foods Limited | Hospitality | 2024 |
| Bishop & Castle Limited | Health & social care | 2024 |
| Bishop & Shaw Limited | Hospitality | 2026 |
| Biskelbilal Ltd | Hospitality | 2018 |
| Bismi Healthcare Limited | Professional & scientific | 2019 |
| Bismillah Departmental Store Ltd | Wholesale & retail | 2020 |
| BISMILLAH786 Limited | Other services | 2016 |
| Bissoi Bissepal Ltd. | Health & social care | 2021 |
| Bistro L!Ve Limited | Arts & recreation | 2000 |
| Bitcare Ltd | Health & social care | 2022 |
| Bite District Ltd | Hospitality | 2025 |
| Bite Knight Ltd | Hospitality | 2025 |
| Bitejoy Ltd | Wholesale & retail | 2025 |
| Biteslam Limited | Hospitality | 2023 |
| Bitex Home Ltd | Real estate | 2014 |
| Bitex Lettings Services Ltd | Real estate | 2026 |
| Bitex Properties Ltd | Real estate | 2015 |
| Bitex Property Care Ltd | Other services | 2026 |
| Bitimpact Limited | Professional & scientific | 2025 |
| Bitlan Projects Ltd | Construction | 2022 |
| Bitlan Solutions Ltd | Construction | 2026 |
| Bitmatrix IT Solutions Limited | Information & communication | 2024 |
| Bitnet Limited | Wholesale & retail | 2019 |
| Bito Cleaning Limited | Administrative & support | 2024 |
| Bits and Bytes Ltd | Professional & scientific | 2025 |
| Bitten Ltd | Professional & scientific | 2025 |
| Bixeno Ltd | Information & communication | 2021 |
| Bizlearnonline Ltd | Wholesale & retail | 2025 |
| Bizmi Global Ltd | Hospitality | 2024 |
| Bizntech Solutions Limited | Information & communication | 2012 |
| Bizzgo Ltd | Wholesale & retail | 2023 |
| BJ Pharmaceutical Services Limited | Health & social care | 2022 |
| Bj's Pizza Franchise Ltd | Other services | 2019 |
| BJB Hire Centre Limited | Administrative & support | 2003 |
| BJM Property Services Limited | Real estate | 2019 |
| BJT Accountancy Ltd | Professional & scientific | 2020 |
| Bjuk Logistics Ltd | Transport & logistics | 2026 |
| BK Accountancy Ltd | Professional & scientific | 2017 |
| BK Accounting Services Ltd | Professional & scientific | 2018 |
| BK Blinds Ltd | Other services | 2025 |
| BK Catering (Leicester) Ltd | Hospitality | 2024 |
| BK DO Domu Ltd | Real estate | 2024 |
| BK Eyecare Ltd | Health & social care | 2022 |
| BK Inflatables Ltd | Arts & recreation | 2022 |
| BK Investments Ltd | Real estate | 2022 |
| BK Joshi Ltd | Wholesale & retail | 2021 |
| BK Property Solutions Ltd | Real estate | 2021 |
| BK Supply Chain Ltd | Wholesale & retail | 2025 |
| BK Wedding Hall Limited | Hospitality | 2018 |
| BK51 Ltd | Real estate | 2025 |
| BKA Traders Limited | Wholesale & retail | 2022 |
| BKD Builders Ltd | Construction | 2025 |
| BKG2 Holdings Ltd | Financial services | 2025 |
| BKJ Group Limited | Financial services | 2018 |
| Bkkb Services Ltd | Information & communication | 2025 |
| BKP Construction Ltd | Construction | 2020 |
| BKR Care Consultancy Limited | Health & social care | 2011 |
| BKR Property Services Ltd | Administrative & support | 2024 |
| BKT Investments Limited | Real estate | 2022 |
| Bktravel One Ltd | Hospitality | 2025 |
| BL Ballers Foundation CIC | Education | 2025 |
| BL Ballers Ltd | Arts & recreation | 2019 |
| BL Garden Maintenance Limited | Construction | 2020 |
| BL Investments (Leic) Ltd | Financial services | 2019 |
| Blaby & Whetstone Youth Club Ltd. | Arts & recreation | 2009 |
| Blaby Antiques Centre Ltd | Wholesale & retail | 2019 |
| Blaby Beauty Clinic Limited | Other services | 2020 |
| Blaby Booze Ltd | Wholesale & retail | 2023 |
| Blaby Building Supplies Limited | Wholesale & retail | 2025 |
| Blaby District MOT and Garage Services Ltd | Wholesale & retail | 2024 |
| Blaby Electrical Limited | Construction | 1991 |
| Blaby Mill Stables Limited | Other services | 2001 |
| Blaby Pre-School Limited | Education | 2011 |
| Blaby SP Ltd | Wholesale & retail | 2025 |
| Blaby SP1 Ltd | Wholesale & retail | 2025 |
| Blaby UK Fitness Ltd | Arts & recreation | 2023 |
| Blaby Westfield Hotel Ltd | Hospitality | 2023 |
| Blac Media Ltd | Information & communication | 2021 |
| Blac Property Services Ltd | Information & communication | 2024 |
| Blacdodo Ltd | Wholesale & retail | 2020 |
| Black & Co Legal Services Limited | Professional & scientific | 2021 |
| Black and Blue Gloves Ltd | Wholesale & retail | 2022 |
| Black Cat Building Products Limited | Construction | 2017 |
| Black Cat Partnership Limited | Financial services | 1993 |
| Black Cat Property Holdings Limited | Administrative & support | 2016 |
| Black Coppice Films Ltd | Arts & recreation | 2021 |
| Black Country Innovative Manufacturing Organisation | Professional & scientific | 2019 |
| Black Daimond FM Services Ltd | Administrative & support | 2025 |
| Black Dog Consultancy Services Ltd | Professional & scientific | 2020 |
| Black DOT Design Ltd | Administrative & support | 2017 |
| Black Dragon Security Limited | Administrative & support | 2024 |
| Black Gate Global Ltd | Information & communication | 2025 |
| Black Iron Ltd | Hospitality | 2021 |
| Black Knight Secondary Glazing Limited | Construction | 2013 |