| Bobby's Foods Limited | Hospitality | 1982 |
| Bobby's Foods Midlands Limited | Hospitality | 1987 |
| Bobby's Foods North East Limited | Hospitality | 1987 |
| Bobby's Foods North London Limited | Hospitality | 1991 |
| Bobby's Foods North West Limited | Hospitality | 1990 |
| Bobby's Foods Northern Limited | Hospitality | 1992 |
| Bobby's Foods Scotland Limited | Hospitality | 1994 |
| Bobby's Foods South Wales Limited | Hospitality | 1982 |
| Bobby's Foods South West Limited | Hospitality | 1992 |
| Bobby's Foods Southern Limited | Hospitality | 1987 |
| Bobtek Limited | Professional & scientific | 2017 |
| Bodies by DAN Limited | Administrative & support | 2018 |
| Body Blueprint Leicester Ltd | Other services | 2024 |
| Body Transformation Centre Limited | Other services | 2016 |
| Body Transformation Centre Loughborough Ltd | Arts & recreation | 2017 |
| Bolist Ltd | Wholesale & retail | 2022 |
| Bolt Beck Limited | Real estate | 2020 |
| Boltson Associates Ltd | Wholesale & retail | 2014 |
| BOM BOM Patisserie Limited | Hospitality | 2018 |
| Bomospark Limited | Professional & scientific | 2024 |
| BON Visage Aesthetics Ltd | Other services | 2022 |
| Bond II Limited | Financial services | 2022 |
| Bond Promotions Ltd | Manufacturing | 2020 |
| Bond Street Group Limited | Wholesale & retail | 1999 |
| Bond-X Ltd | Wholesale & retail | 2024 |
| Bondoroz Limited | Information & communication | 2018 |
| Bondrite Adhesives Limited | Manufacturing | 2002 |
| Bonds Confectionery Limited | Extraterritorial | 2001 |
| Bonds of London Limited | Wholesale & retail | 1999 |
| Bonfre Ltd | Wholesale & retail | 2025 |
| Bonington Consulting Ltd | Professional & scientific | 2025 |
| Bonington Consulting Services Ltd | Professional & scientific | 2015 |
| Bonzer IT Limited | Information & communication | 2023 |
| BOO BOO Hunter Ltd | Information & communication | 2022 |
| Bookboon.Com Limited | Professional & scientific | 2010 |
| Boosted Brothers Ltd | Wholesale & retail | 2025 |
| Booth Fashion Services Limited | Administrative & support | 2022 |
| Booze Zone Ltd | Wholesale & retail | 2018 |
| Boring Brand Ltd. | Information & communication | 2023 |
| Bostech Limited | Professional & scientific | 2016 |
| Boswell Plasterers Limited | Construction | 2014 |
| BOT Properties Limited | Real estate | 2020 |
| Boujee Express Limited | Hospitality | 2024 |
| Bourdex Ltd | Wholesale & retail | 2025 |
| Bower Willis Designs Ltd | Manufacturing | 2009 |
| Bowes Wood Properties Ltd | Real estate | 2021 |
| Bowley in the Hollow Ltd | Real estate | 2021 |
| Bowley Properties Limited | Real estate | 2018 |
| Bowman Assets Consultancy Ltd | Professional & scientific | 2019 |
| Box Coffee Shop Limited | Hospitality | 2025 |
| Box Studio Leicester Ltd | Arts & recreation | 2018 |
| Box Studio Limited | Arts & recreation | 2019 |
| Box Studio Loughborough Ltd. | Arts & recreation | 2017 |
| Boxaero Limited | Real estate | 2001 |
| Boxing Breaks Limited | Information & communication | 2016 |
| Boyfield & Freeman Limited | Manufacturing | 1998 |
| BP Rigging Academy Ltd | Manufacturing | 2026 |
| Bqptechnologies Ltd | Manufacturing | 2026 |
| Bradburys Global Risk Group Limited | Administrative & support | 2022 |
| Bradgate Building Solutions Ltd | Construction | 2020 |
| Bradgate Containers (Holdings) Limited | Professional & scientific | 2002 |
| Bradgate Containers Limited | Manufacturing | 1982 |
| Bradgate Electrical Services Limited | Construction | 2016 |
| Bradgate Industrial Properties Limited | Real estate | 1942 |
| Bradgate Installations Ltd | Manufacturing | 2015 |
| Bradgate Properties and Investments Ltd | Real estate | 2024 |
| Bradgate Removals and Storage Ltd | Transport & logistics | 2020 |
| Bradley Financial Management Ltd | Professional & scientific | 2018 |
| Bradys Boarders Limited | Other services | 2020 |
| Brand Master INT Ltd | Wholesale & retail | 2022 |
| Braund Limited | Hospitality | 2019 |
| Bravo Healthcare Ltd | Health & social care | 2023 |
| Break Escape Holdings Ltd | Arts & recreation | 2023 |
| Break Escape Ltd | Arts & recreation | 2016 |
| Breedon Consulting Limited | Professional & scientific | 2004 |
| Breedon HR Limited | Administrative & support | 2020 |
| Breedon Priory Holdings Limited | Financial services | 2016 |
| Brensom Ltd | Wholesale & retail | 2025 |
| Brewin Property Developments Limited | Construction | 2021 |
| Brewster Transport Ltd | Construction | 2009 |
| Brian Clark Consulting Limited | Administrative & support | 2023 |
| Brian Investments Ltd | Real estate | 2021 |
| Brian Sibley Builders Limited | Construction | 2003 |
| Brick Bros Ltd | Construction | 2020 |
| Bricks & Mortar Co. Ltd | Real estate | 2026 |
| Bricworx Limited | Construction | 2025 |
| Bridge Marketing Services Limited | Professional & scientific | 1998 |
| BRIDGE4 Health Limited | Health & social care | 2015 |
| BRIDGE4 Rehabilitation Limited | Health & social care | 2015 |
| Bridgeroots CIC | Education | 2025 |
| Bridgeway Advisory Limited | Financial services | 2025 |
| Bridon Distribution Limited | Professional & scientific | 1912 |
| Bright Bridges: Connecting Hearts Through Education Ltd | Information & communication | 2025 |
| Bright Ideas Global Group Limited | Wholesale & retail | 2008 |
| Bright Path Futures CIC | Professional & scientific | 2022 |
| Bright Spark Publishing Ltd | Information & communication | 2017 |
| Brightcare Group Limited | Health & social care | 2024 |
| Brighter Futures Education Ltd | Education | 2025 |
| Brighthedge Limited | Professional & scientific | 1995 |
| Brightlights Theatre School Limited | Education | 2012 |