| Bridge Capital Connect Ltd | Financial services | 2023 |
| Bridge Capital Properties Ltd | Real estate | 2024 |
| Bridge Point Social Consultancy Ltd | Health & social care | 2025 |
| Bridgewater Holdings Ltd | Real estate | 1979 |
| Bright Flame London Limited | Construction | 2016 |
| Bright Owls Nursery Ltd | Education | 2013 |
| Bright Star Food & Wine Ltd | Wholesale & retail | 2020 |
| Bright Star Properties Limited | Construction | 2010 |
| Brightvision Solutions Limited | Information & communication | 2013 |
| Brijon Limited | Extraterritorial | 2005 |
| Britannia College of Science & Technology Ltd | Education | 2004 |
| Britannic Language Centre Limited | Education | 1985 |
| Britcode Limited | Information & communication | 2024 |
| Brited Limited | Education | 2008 |
| Britile Ltd | Construction | 2017 |
| British Guarantee Trust Limited | Financial services | 1945 |
| Britpanj Limited | Transport & logistics | 2017 |
| Brize Properties Ltd | Construction | 2023 |
| Brjp Property Limited | Real estate | 2025 |
| Broadway Dental Practice Limited | Health & social care | 2010 |
| Broadweighs Holdings Limited | Wholesale & retail | 2019 |
| Broadweighs Limited | Wholesale & retail | 2018 |
| Brookland Warwick Limited | Real estate | 2019 |
| Brooks Media Solutions Limited | Professional & scientific | 2010 |
| Brookside Capital Limited | Real estate | 2026 |
| Broombeg Shellfish Limited | Agriculture & fishing | 2018 |
| Broomhill Productions Limited | Professional & scientific | 2025 |
| Brooms & Scoops Ltd | Information & communication | 2023 |
| Brother Scaffolding Limited | Construction | 2015 |
| Brothers Caffe Lounge Ltd | Hospitality | 2025 |
| Brovbro Football Academy Ltd | Education | 2022 |
| Brown & Birch Limited | Real estate | 2014 |
| Brown and Harper Limited | Hospitality | 2016 |
| Browning Road Limited | Hospitality | 2017 |
| Brownstone Ashurst VC Ltd | Administrative & support | 2017 |
| Brqs Limited | Professional & scientific | 2022 |
| BRS Traders Limited | Wholesale & retail | 2024 |
| Bruce Consultants Limited | Real estate | 2010 |
| Bruk Cleaning Limited | Administrative & support | 2019 |
| Bruno AI Limited | Information & communication | 2026 |
| Bruno Consens Ltd | Construction | 2019 |
| Bruvan Limited | Wholesale & retail | 1981 |
| BS Place Ltd | Administrative & support | 2021 |
| BS23 Leases Limited | Real estate | 2023 |
| BSA Glazing and Plastic Limited | Construction | 2026 |
| BSH Healthcare Limited | Health & social care | 2023 |
| BSP Tech Ltd | Other services | 2016 |
| BTD International Ltd | Professional & scientific | 2017 |
| Btlw Lettings Ltd | Real estate | 2015 |
| BTLWSPV000001 Ltd | Real estate | 2015 |
| BTLWSPV000002 Ltd | Real estate | 2015 |
| BTLWSPV000003 Ltd | Real estate | 2015 |
| BTLWSPV000004 Ltd | Real estate | 2015 |
| BTLWSPV000005 Ltd | Real estate | 2016 |
| BTLWSPV000006 Ltd | Real estate | 2016 |
| BTLWSPV000008 Ltd | Real estate | 2016 |
| BTLWSPV000009 Ltd | Real estate | 2016 |
| BTLWSPV000010 Ltd | Real estate | 2016 |
| BTLWSPV000011 Ltd | Real estate | 2016 |
| BTLWSPV000012 Ltd | Real estate | 2016 |
| BTLWSPV000013 Ltd | Administrative & support | 2016 |
| BTLWSPV000014 Ltd | Administrative & support | 2016 |
| BTLWSPV000015 Ltd | Real estate | 2016 |
| BTLWSPV000016 Ltd | Real estate | 2016 |
| BTLWSPV000017 Ltd | Real estate | 2016 |
| BTLWSPV000018 Ltd | Real estate | 2016 |
| BTLWSPV000019 Ltd | Real estate | 2016 |
| BTLWSPV000020 Ltd | Real estate | 2016 |
| BTLWSPV000021 Ltd | Real estate | 2016 |
| BTLWSPV000022 Ltd | Real estate | 2016 |
| BTLWSPV000023 Ltd | Real estate | 2016 |
| BTLWSPV000024 Ltd | Real estate | 2016 |
| BTLWSPV000025 Ltd | Real estate | 2017 |
| BTLWSPV000026 Ltd | Real estate | 2017 |
| BTLWSPV000027 Ltd | Real estate | 2017 |
| BTLWSPV000028 Ltd | Real estate | 2017 |
| BTLWSPV000029 Ltd | Real estate | 2017 |
| BTLWSPV000030 Ltd | Real estate | 2017 |
| BTLWSPV000031 Ltd | Real estate | 2017 |
| BTLWSPV000032 Ltd | Real estate | 2017 |
| BTLWSPV000033 Ltd | Real estate | 2017 |
| BTLWSPV000034 Ltd | Real estate | 2017 |
| BTLWSPV000035 Ltd | Real estate | 2017 |
| BTLWSPV000036 Ltd | Real estate | 2017 |
| BTLWSPV000037 Ltd | Real estate | 2017 |
| BTLWSPV000038 Ltd | Real estate | 2017 |
| BTLWSPV000039 Ltd | Real estate | 2017 |
| BTLWSPV000040 Ltd | Real estate | 2017 |
| BTLWSPV000041 Ltd | Real estate | 2017 |
| BTLWSPV000042 Ltd | Real estate | 2017 |
| BTLWSPV000043 Ltd | Real estate | 2017 |
| BTS Facades Services Ltd | Construction | 2023 |
| BTS Interiors Ltd | Construction | 2017 |
| BTS Property Solutions Ltd | Construction | 2017 |
| BTS Special Works Ltd | Construction | 2022 |
| Bubble Town Limited | Hospitality | 2019 |
| Bubbles ‘N’ Brownies Limited | Hospitality | 2024 |
| Buckingham Asset Finance Limited | Financial services | 2022 |
| Budd Investments Limited | Real estate | 2019 |
| Budd London Holding Company Limited | Financial services | 2021 |