| Bobbie Hardy Industries Ltd | Wholesale & retail | 2024 |
| Bobbins Mcgee Limited | Professional & scientific | 2025 |
| Bobby DON Construction Ltd | Construction | 2021 |
| Boboe V Limited | Real estate | 2020 |
| Bocking Investment Ltd | Real estate | 2017 |
| Bodaciousyoungkxngs(Byk) Ltd | Wholesale & retail | 2022 |
| Bodhi Enterprices Ltd | Wholesale & retail | 2018 |
| Bodley & Jones Immigration Solutions Limited | Other services | 2024 |
| Body ARK Personal Trainer Ltd | Extraterritorial | 2024 |
| Body Crush London Ltd | Other services | 2021 |
| Body Piercing by Jodie Ltd | Other services | 2022 |
| Bodyworks Chiropractic Clinic Limited | Health & social care | 2011 |
| Bodyworks Physiotherapy Associates Limited | Health & social care | 2014 |
| Boiler Medic (London) Limited | Construction | 2021 |
| Boiler Medic Limited | Extraterritorial | 2013 |
| Boiler TEC Group Ltd | Construction | 2023 |
| Boilersure Ltd | Construction | 2018 |
| Bold Brush Design Co. Ltd | Manufacturing | 2023 |
| Boldens Signage Solutions Limited | Manufacturing | 2006 |
| Boldvia Ltd | Administrative & support | 2017 |
| Boleyn Films Limited | Information & communication | 2024 |
| Bolingbroke & Wenley Limited | Extraterritorial | 2006 |
| Bolt Tools Limited | Wholesale & retail | 2025 |
| Bolts Online Limited | Extraterritorial | 2022 |
| Bond Plumbing & Heating Services LLP | | 2025 |
| Bond Street Security Ltd | Administrative & support | 2006 |
| Bones Yard Colne Engaine Limited | Households | 2015 |
| Bonita ME Limited | Wholesale & retail | 2025 |
| Bonnetone Services Limited | Health & social care | 2015 |
| Bonobo's Perception Ltd | Information & communication | 2016 |
| Bonsella Ltd | Real estate | 2010 |
| Bontelsie Ltd | Agriculture & fishing | 2015 |
| Book Club Ltd | Information & communication | 2013 |
| Book of Genesis Ltd | Wholesale & retail | 2022 |
| BOOK4TRIP Ltd | Hospitality | 2025 |
| Booking Rhino Ltd | Administrative & support | 2025 |
| Booking Urban Ltd | Hospitality | 2020 |
| Bookkeeping & Accounting Services Ltd | Professional & scientific | 2025 |
| Bookra Ltd | Information & communication | 2026 |
| Books and Accounts Ltd | Professional & scientific | 2009 |
| Boolbase Ltd | Information & communication | 2025 |
| Boomerang Records Limited | Wholesale & retail | 2020 |
| Boomslang Consultants Limited | Information & communication | 2015 |
| Boosted Active Hubs Ltd | Education | 2024 |
| Boostore Limited | Information & communication | 2012 |
| Bora Food & Wine Limited | Wholesale & retail | 2023 |
| Borderhouse Solutions Ltd | Information & communication | 2025 |
| Born Consultancy Limited | Professional & scientific | 2015 |
| Born Fearless Limited | Professional & scientific | 2023 |
| Boscombe Court Management Company Limited | Households | 2014 |
| Bosh Sports Limited | Wholesale & retail | 2020 |
| Bosham Capital Advisors Ltd | Financial services | 2015 |
| Bosi Solutions Ltd | Information & communication | 2022 |
| Bosker Property Ltd | Real estate | 2024 |
| Boss Mann Solicitors Limited | Professional & scientific | 2020 |
| Both Birds Limited | Information & communication | 2017 |
| Botolphs Street Convenience Limited | Wholesale & retail | 2025 |
| Boudica Biohazard & Pest Control Ltd | Administrative & support | 2026 |
| Bougie Hair & Beauty Ltd | Wholesale & retail | 2025 |
| Boulding & Moore Ltd | Real estate | 2018 |
| BOUNCEABILITY4ALL CIC | Arts & recreation | 2025 |
| Bound Digital Ltd | Professional & scientific | 2022 |
| Boundary Investments Ltd | Real estate | 2023 |
| Boundless Abilities CIC | Health & social care | 2024 |
| Bournebrook Farnham Road LLP | | 2021 |
| Bournebrook Management Company Ltd | Real estate | 2025 |
| Bournebrook Phase Two Limited | Real estate | 2026 |
| Bouwen Limited | Real estate | 2000 |
| Bowcott Limited | Manufacturing | 1994 |
| Bowie and Blondie Vintage Ltd | Wholesale & retail | 2025 |
| Bowling Garrard Electrical Limited | Construction | 1971 |
| Bowness Developments Limited | Real estate | 1972 |
| Box House Beekeeping Supplies Ltd | Wholesale & retail | 2017 |
| Box River Vineyard Limited | Agriculture & fishing | 2024 |
| Boxford (Suffolk) Farms Limited | Agriculture & fishing | 1993 |
| Boxford (Suffolk) Holdings Limited | Professional & scientific | 1949 |
| Boxted Cross Management Limited | Extraterritorial | 2019 |
| Boxted Estate Management Ltd | Households | 2024 |
| Boxted Landscapes Ltd | Administrative & support | 2005 |
| Boxwebs Ltd. | Information & communication | 2017 |
| Boxwise Limited | Wholesale & retail | 1991 |
| Boyd Morison Risk Management Ltd. | Financial services | 1996 |
| Boydens Limited | Real estate | 2015 |
| Boyle-Ames Limited | Administrative & support | 2019 |
| Boys & MEN UK CIC | Education | 2026 |
| Boys & MEN UK Club CIC | Hospitality | 2024 |
| Bozdag Holdings Limited | Real estate | 2026 |
| Bozo 23 Limited | Hospitality | 2026 |
| Boztepe EN Ltd | Real estate | 2020 |
| BP Interiors Limited | Real estate | 2021 |
| BP Pavers Limited | Administrative & support | 2024 |
| Bpab Limited | Real estate | 2022 |
| BPG Bass Limited | Arts & recreation | 2018 |
| BPT Solutions Ltd | Administrative & support | 2024 |
| Brad Design UK Limited | Professional & scientific | 2008 |
| Bradlec Electrical Contractors Limited | Construction | 2007 |
| Bradley and Associates Consultants Limited | Professional & scientific | 2023 |
| Bradley Earl Holdings Ltd | Professional & scientific | 2018 |
| Bradshaw Roofing Contractors LLP | | 2020 |
| Bradshaw Trenching Limited | Construction | 2007 |