| Bodrum Corner Cafe Limited | Hospitality | 2024 |
| Body and Soul Fitness Limited | Arts & recreation | 2025 |
| Bodytalk Fashions Ltd | Wholesale & retail | 2024 |
| Bodytec (UK) Limited | Wholesale & retail | 2000 |
| Bogdan’S Home Solutions Ltd | Construction | 2024 |
| Bogz Logistic Ltd | Transport & logistics | 2022 |
| Boho Club Ltd | Financial services | 2015 |
| Bohola Property Company Limited | Real estate | 2017 |
| Bohostride Ltd | Wholesale & retail | 2025 |
| Boileau Consulting Limited | Information & communication | 2015 |
| Boilerfix Reading Limited | Construction | 2021 |
| Boilertech Plumbing & Heating Ltd | Construction | 2022 |
| BOK Pros Ltd | Information & communication | 2000 |
| Boken Group Limited | Wholesale & retail | 2024 |
| Bold Reality Limited | Professional & scientific | 2024 |
| Boldly Glow Media Ltd | Information & communication | 2022 |
| Bollywood Dance Worldwide Limited | Arts & recreation | 2016 |
| Bollywood Events UK Ltd | Arts & recreation | 2023 |
| Bollé & Bloom Ltd | Professional & scientific | 2021 |
| Bolney Park Limited | Real estate | 2014 |
| Bolt & SON Engineering Ltd | Professional & scientific | 2025 |
| Bombay Brothers Ltd | Hospitality | 2022 |
| Bombay Punjabi Ltd | Hospitality | 2023 |
| BON Chef Ltd | Wholesale & retail | 2005 |
| Boncare Recruitment Limited | Administrative & support | 2013 |
| Bond Marine Ltd | Manufacturing | 2025 |
| Bondline Brickwork Ltd | Construction | 2026 |
| Bondstyle Limited | Professional & scientific | 1998 |
| Bone Bros Limited | Real estate | 1989 |
| Bones to Jones Ltd | Arts & recreation | 2024 |
| Bonga Africa Limited | Manufacturing | 2009 |
| Bongo Deejays Events Limited | Health & social care | 2015 |
| Bonkem Limited | Health & social care | 2022 |
| Bonner Consulting Ltd | Professional & scientific | 2012 |
| Bonnevilles Detailing Ltd | Other services | 2019 |
| Bonnevilles Property Ltd | Real estate | 2021 |
| Bonni B&B Ltd | Hospitality | 2025 |
| Bonnie Construction Ltd | Construction | 2026 |
| Bonny BOY Media Ltd | Information & communication | 2026 |
| Bonny Design Ltd | Manufacturing | 2024 |
| Boogie Time Disco Limited | Arts & recreation | 2025 |
| Booked by Hannah Limited | Administrative & support | 2018 |
| Bookiic Limited | Professional & scientific | 2014 |
| Bookkeeping Secrets Ltd | Information & communication | 2021 |
| Books House Ltd | Wholesale & retail | 2025 |
| Books Supplier Ltd | Manufacturing | 2026 |
| BOOMERANG4U Ltd | Administrative & support | 2016 |
| Boomf Gifts Ltd | Wholesale & retail | 2021 |
| Boorter Limited | Information & communication | 2026 |
| Booze N Go Ltd | Wholesale & retail | 2025 |
| Bordon Dental Centre Ltd | Health & social care | 2018 |
| Born Digital Limited | Information & communication | 2002 |
| Born for a Purpose Ltd | Health & social care | 2022 |
| Bornpatriot Ltd | Wholesale & retail | 2023 |
| Borut Ltd | Transport & logistics | 2016 |
| BOS Estimating Ltd | Professional & scientific | 2018 |
| Bose Technologies Limited | Information & communication | 2014 |
| Bosman Services Ltd | Construction | 2013 |
| Bosmore Global Investments Limited | Administrative & support | 2018 |
| Bosola Limited | Health & social care | 2015 |
| Bosqmap Ltd | Information & communication | 2009 |
| Bosque International Ltd | Extraterritorial | 2015 |
| Bossman Consultancy Limited | Administrative & support | 2021 |
| Bossman Industries Ltd | Professional & scientific | 2026 |
| Boston Corporate Services Limited | Professional & scientific | 2003 |
| Boston Fidelity Corporation Limited | Financial services | 2003 |
| Botan Newbury Limited | Hospitality | 2019 |
| Botanical Bliss Ltd | Wholesale & retail | 2023 |
| Botchway Consultancy Ltd | Information & communication | 2025 |
| Bottomline Payment Services Limited | Financial services | 2000 |
| Bottomline Technologies Europe Limited | Financial services | 1999 |
| Bottomline Technologies Limited | Information & communication | 2012 |
| Bouchier Fencing Limited | Manufacturing | 1969 |
| Bougie Developments Ltd | Construction | 2021 |
| Boujie Beauty & Aesthetics Ltd | Other services | 2026 |
| Boujiee Boutique Ltd | Wholesale & retail | 2024 |
| Boulals Brothers Ltd | Transport & logistics | 2019 |
| Boulstridge Limited | Administrative & support | 2023 |
| Bounce 2 Hire Ltd | Administrative & support | 2023 |
| Boundary Flooring Ltd | Construction | 2018 |
| Boustead Telecom Services Ltd | Information & communication | 2013 |
| Boutique Estates Ltd | Real estate | 2018 |
| Bow-Thai Limited | Real estate | 2003 |
| Bowbrook Copse (M.C.) Limited | Households | 2025 |
| Bowe Productions Ltd | Information & communication | 2010 |
| Bowring Brookes Limited | Financial services | 2026 |
| Bowriver Limited | Financial services | 2019 |
| Bowshaway Consulting Ltd | Administrative & support | 2024 |
| Boxfive Solutions Ltd | Information & communication | 2010 |
| Boxford Restaurant Limited | Hospitality | 2020 |
| BOXIN2SHAPE Ltd | Arts & recreation | 2025 |
| Boyce Taverns Limited | Hospitality | 1997 |
| Boyes Turner LLP | | 2011 |
| Boyes Turner Services Limited | Professional & scientific | 2010 |
| Boyes Turner Trust Corporation Limited | Professional & scientific | 2020 |
| Boyor Limited | Information & communication | 2018 |
| Bozedown Alpacas Limited | Agriculture & fishing | 2004 |
| Bozedown Boltholes Limited | Hospitality | 2021 |
| Bozedown Limited | Real estate | 2017 |
| Bozzanova Solutions Limited | Information & communication | 2015 |