| Bovxz Ltd | Wholesale & retail | 2024 |
| BOW Excellence Limited | Transport & logistics | 2019 |
| BOW Property Solutions Ltd | Real estate | 2025 |
| Bow-Wow Boutique and Spa Limited | Other services | 2016 |
| Bowcom a S L Limited | Manufacturing | 2018 |
| Bowden Jones ABS Limited | Professional & scientific | 2015 |
| Bowden Jones Ltd | Professional & scientific | 2010 |
| Bowen Construction Services Limited | Construction | 2002 |
| Bowen Dental Engineering Ltd | Health & social care | 2019 |
| Bowen Eldridge Recruitment Ltd | Administrative & support | 2016 |
| Bowen Financial Services Limited | Financial services | 2026 |
| Bowermans Limited | Health & social care | 2024 |
| Bowfell & Co Healthcare Ltd | Wholesale & retail | 2020 |
| Bowhouse Studios Ltd | Information & communication | 2019 |
| Bowie Music Ltd | Arts & recreation | 2024 |
| Bowline Rigging Services Ltd | Information & communication | 2020 |
| Bowlswales | Administrative & support | 2017 |
| Box a Design Ltd | Information & communication | 2011 |
| Box Clever Design & Consultancy Limited | Professional & scientific | 2013 |
| Box Hotels & Guesthouses Ltd | Hospitality | 2021 |
| Box Real Estate Limited | Administrative & support | 2018 |
| Box Retail 13 Ltd | Wholesale & retail | 2025 |
| Box UK Limited | Information & communication | 1998 |
| Boxagogo Ltd | Transport & logistics | 2015 |
| Boxed Clever Limited | Professional & scientific | 2009 |
| Boxfit Personal Training T/A B Fit Personal Training Ltd | Other services | 2012 |
| Boxington Ltd | Real estate | 2019 |
| Boxington Squared Ltd | Professional & scientific | 2021 |
| Boxinrui (UK) Limited | Professional & scientific | 2009 |
| Boxlogic Limited | Hospitality | 2017 |
| BOY DAD Club Limited | Wholesale & retail | 2026 |
| BOY Trans Ltd | Transport & logistics | 2016 |
| Boyes Transportation Ltd | Transport & logistics | 2025 |
| Boytalk CIC | Health & social care | 2026 |
| BOZ Designers Services Limited | Professional & scientific | 2004 |
| Bozhi Fanglue International Investment Group Co Ltd | Information & communication | 2022 |
| BP Cleary Limited | Professional & scientific | 2023 |
| BP INV6 Bidco Limited | Financial services | 2023 |
| BP Leisure Limited | Arts & recreation | 2026 |
| BP Radiology Limited | Health & social care | 2013 |
| BPI Tech LLP | | 2025 |
| BPM Stage 2 Performance CYF | Wholesale & retail | 2026 |
| Bpoak Limited | Professional & scientific | 2024 |
| BPS Facilities Limited | Construction | 2010 |
| BPS Group Ltd | Construction | 2022 |
| BPS Network Holdings Ltd | Information & communication | 2019 |
| Bpsukil Ltd | Other services | 2019 |
| BPU Financial Solutions Limited | Financial services | 2011 |
| BR Finance Limited | Information & communication | 2015 |
| BR Snacks Delivery Ltd | Manufacturing | 2020 |
| BR10 Construction Ltd | Construction | 2023 |
| Braben Limited | Administrative & support | 2024 |
| Brabia Global Limited | Wholesale & retail | 2025 |
| Brackla MOT Limited | Real estate | 2013 |
| Brad Business Solutions Ltd | Professional & scientific | 2024 |
| Bradbury & Wallis Limited | Other services | 2019 |
| Bradford International Collage of Technology Ltd | Education | 2025 |
| Bradley Associates Limited | Professional & scientific | 1993 |
| Bradley Basso Limited | Manufacturing | 2017 |
| Bradley Dredge Limited | Real estate | 2006 |
| Bradley Electrical Services Ltd | Construction | 2016 |
| Bradley Stellar Ltd | Wholesale & retail | 2024 |
| Bradley Toynton Properties Ltd | Real estate | 2023 |
| Braehead Revisited Ltd | Hospitality | 2018 |
| Braen Systems Group PC | | 2017 |
| Braichl Logistics Ltd | Transport & logistics | 2026 |
| Braidscardiff Ltd | Other services | 2025 |
| Brain Crown Buckley Limited | Extraterritorial | 1997 |
| Brain Kingdom Trading Ltd | Information & communication | 2021 |
| Brain Solutions Concept Limited | Professional & scientific | 2007 |
| Brain Solutions Ltd | Wholesale & retail | 2017 |
| Brain Talk CIC | Education | 2023 |
| Brain Test Ltd | Information & communication | 2025 |
| Brain-Ia Ltd | Information & communication | 2022 |
| Brainbox Group Limited | Financial services | 2022 |
| Brainbox Ltd | Professional & scientific | 2010 |
| Brainmetrics Ltd | Information & communication | 2026 |
| Braintech Ltd | Professional & scientific | 2021 |
| Brainy Binder Ltd | Administrative & support | 2025 |
| Brainy Creative Limited | Information & communication | 2019 |
| Brakenhale Limited | Health & social care | 2014 |
| Brakes Hydropower Ltd | Professional & scientific | 2021 |
| Brakesafe Ltd | Manufacturing | 2013 |
| Brakespeed Investments Limited | Real estate | 1999 |
| Brakley Digital Limited | Wholesale & retail | 2018 |
| Bramble and Lily Limited | Wholesale & retail | 2020 |
| Bramble Mill Limited | Hospitality | 1999 |
| Bramerton Condiments Ltd | Manufacturing | 2011 |
| Brampton Publishers Ltd | Information & communication | 2016 |
| Bramptons Residential Estates Ltd | Health & social care | 2013 |
| Branch Personnel Limited | Administrative & support | 2018 |
| Brand 68 Limited | Administrative & support | 2008 |
| Brand and BRO Limited | Professional & scientific | 2022 |
| Brand Coverage Ltd | Administrative & support | 2019 |
| Brand Engaged Ltd | Professional & scientific | 2024 |
| Brand Fusion Strategies Limited | Professional & scientific | 2024 |
| Brand Hatchers Ltd | Wholesale & retail | 2019 |
| Brand in Hand Limited | Professional & scientific | 2015 |
| Brand Media Marketing Ltd | Professional & scientific | 2023 |
| Brand New Living (CG) Ltd | Construction | 2019 |