| Barrowby Chase Residents Management Company Limited | Households | 2025 |
| Barrowhill Trading Ltd | Wholesale & retail | 2025 |
| Barry Bott Jewellers Limited | Wholesale & retail | 1999 |
| Barry&Fils Limited | Transport & logistics | 2015 |
| Barsana Properties Ltd | Real estate | 2022 |
| Barsby Engineering Limited | Other services | 2020 |
| Barset Music Productions Limited | Information & communication | 1980 |
| Barter & Miles Limited | Transport & logistics | 2025 |
| Barthbol Services Limited | Wholesale & retail | 2024 |
| Barthelot Courier Ltd | Transport & logistics | 2023 |
| Bartlomiej Bartoszek Limited | Administrative & support | 2016 |
| Barton Financial Limited | Financial services | 2015 |
| Barton-Knott Travel Limited | Administrative & support | 1984 |
| Baruch Support Ltd | Transport & logistics | 2025 |
| Barwany Ltd | Wholesale & retail | 2019 |
| Barwell Askeby Ltd | Wholesale & retail | 2025 |
| Barwell Construction Limited | Professional & scientific | 2012 |
| Barwell Embroidery Services Limited | Manufacturing | 2006 |
| Barwell Fish Bar Limited | Hospitality | 2022 |
| Barwell Logistics Ltd | Administrative & support | 2020 |
| Barwell Medical Property Ltd | Real estate | 2021 |
| Barwell Village Hall Playgroup Ltd | Education | 2020 |
| Barwell Windows 2000 Ltd | Construction | 2015 |
| BAS Transport Ltd | Transport & logistics | 2017 |
| Basar Limited | Administrative & support | 2019 |
| Basar Ozkan PM Ltd | Real estate | 2026 |
| Baschay Limited | Construction | 2010 |
| Base Eco Limited | Extraterritorial | 2013 |
| Base Manufacturing Limited | Manufacturing | 2012 |
| Baseform Sports Limited | Wholesale & retail | 2026 |
| Baseline Education Ltd | Education | 2020 |
| Basford Bailey Ltd | Wholesale & retail | 2025 |
| Bash Investments Ltd | Wholesale & retail | 2024 |
| Bash-Uk Ltd | Hospitality | 2020 |
| Bashir Salah ALI Hassan and Partners Ltd | Construction | 2023 |
| Bashy Enterprise Ltd | Hospitality | 2026 |
| Basi Group Ltd | Construction | 2010 |
| Basi Lettings Limited | Real estate | 2026 |
| Basi Planning Ltd | Professional & scientific | 2024 |
| Basic Premier Limited | Manufacturing | 2012 |
| Basic Textiles Ltd | Wholesale & retail | 2017 |
| Basil House Property Limited | Real estate | 2019 |
| Basildon Unbeatable Ltd | Transport & logistics | 2015 |
| Basin Design Limited | Manufacturing | 2024 |
| Basin View Limited | Households | 2010 |
| Basis Cloud Solutions Ltd | Information & communication | 2022 |
| Basis Construction Ltd | Construction | 2020 |
| Basit Ahmadi Ltd | Wholesale & retail | 2024 |
| Basketball League Limited(The) | Arts & recreation | 1986 |
| Basra Consulting Services Ltd | Information & communication | 2023 |
| Basran Estates Limited | Real estate | 2025 |
| Basran Properties Ltd | Real estate | 2019 |
| Bass Family Investments Limited | Real estate | 2020 |
| Bass One Limited | Real estate | 2025 |
| Bass Talking Therapies Ltd | Health & social care | 2023 |
| Bassetts Management Ltd | Professional & scientific | 2012 |
| Bassi Aesthetics Academy Ltd | Health & social care | 2025 |
| Bassingham Deals Ltd | Transport & logistics | 2015 |
| Bastian Capital Limited | Financial services | 2025 |
| Bastian Consulting Ltd | Professional & scientific | 2024 |
| Bastian Holdings Limited | Financial services | 2024 |
| Bastian PLC | Professional & scientific | 2017 |
| Basu Famalam Company Limited | Real estate | 2023 |
| BAT & Padel Ltd | Education | 2026 |
| Batangas Services Ltd | Wholesale & retail | 2026 |
| Batch 50 Ltd | Financial services | 2025 |
| Bateela Ltd | Wholesale & retail | 2025 |
| Bateleur HC Ltd | Health & social care | 2019 |
| Bates Controls Ltd | Professional & scientific | 2023 |
| Bates Financial Solutions Limited | Financial services | 2023 |
| Bates Hawkins Limited | Financial services | 2011 |
| Bates Property (Leicestershire) Ltd | Real estate | 2026 |
| Bath BTL Ltd | Real estate | 2024 |
| Bath Choice Ltd | Wholesale & retail | 2018 |
| Bathe in Green Limited | Wholesale & retail | 2020 |
| Bathkawri Ltd | Hospitality | 2022 |
| Bathroom Planet Leicester Limited | Wholesale & retail | 2021 |
| Bathroom Renovations UK Ltd | Construction | 2022 |
| Bathrooms & Tiles Limited | Wholesale & retail | 2024 |
| Bathrooms 365 (Leicester) Limited | Wholesale & retail | 2014 |
| Batth Consultants Ltd | Information & communication | 2025 |
| Battima Cleaning Services Ltd | Administrative & support | 2025 |
| Battleface Insurance Services Limited | Financial services | 2012 |
| Battu Buildings Limited | Real estate | 2006 |
| Batuk Ltd. | Administrative & support | 2017 |
| BAU Associates Limited | Wholesale & retail | 2008 |
| BAU Street Limited | Construction | 2016 |
| Baugh Transport Limited | Transport & logistics | 1981 |
| Baux Holdings Ltd | Wholesale & retail | 2024 |
| Bawan Properties Limited | Real estate | 1999 |
| Bawarchi Blaby Ltd | Hospitality | 2026 |
| Bawarchi Leicester Ltd | Hospitality | 2020 |
| Bawdon Properties Ltd | Real estate | 2019 |
| Bawtry Solutions Limited | Wholesale & retail | 2025 |
| BAX Transport Limited | Transport & logistics | 2021 |
| Baxi Investments Ltd | Real estate | 2024 |
| Bay Court Clevedon Ltd | Construction | 2025 |
| Bay Court Residents' Management Company Limited | Households | 2023 |
| Bay Medical Consultancy Limited | Education | 2020 |
| Bay Noon Ltd | Wholesale & retail | 2024 |