| Blackstone Mortgage and Protection Ltd | Ilford | 2021 |
| Blackstone One Ltd | Cardiff | 2011 |
| Blackstone Private Clients Ltd | London | 2012 |
| Blackstone Protect Ltd | South Woodford | 2019 |
| Blackstone Real Estate Capital UK Asia II NQ Limited | London | 2018 |
| Blackstone Real Estate Capital UK Asia III Limited | London | 2022 |
| Blackstone Real Estate Capital UK Asia Limited | London | 2013 |
| Blackstone Real Estate Capital UK VII Limited | London | 2011 |
| Blackstone Real Estate Capital UK Viii Limited | London | 2015 |
| Blackstone Real Estate Capital UK X Limited | London | 2024 |
| Blackstone Real Estate Partners Gold Supervisory GP Limited | London | 2020 |
| Blackstone Real Estate Supervisory UK Asia II NQ Limited | London | 2018 |
| Blackstone Real Estate Supervisory UK Asia III Limited | London | 2022 |
| Blackstone Real Estate Supervisory UK Asia Limited | London | 2013 |
| Blackstone Real Estate Supervisory UK VII Limited | London | 2011 |
| Blackstone Real Estate Supervisory UK Viii Limited | London | 2015 |
| Blackstone Real Estate Supervisory UK X Limited | London | 2024 |
| Blackstone UK Investments Limited | London | 2015 |
| Blackstone Wealth Ltd | Luton | 2022 |
| Blackstorm Capital Limited | London | 2025 |
| Blackstown Holdings Limited | Hersham | 2015 |
| Blackstream Holdings Ltd | London | 2025 |
| Blackstryke Vault Limited | London | 2026 |
| Blackswan Financial Ltd | Hemsworth | 2017 |
| Blackswanobsidian.Insure Ltd | Braintree | 2025 |
| Blackswanobsidian.Money Ltd | Braintree | 2025 |
| Blackswanobsidian.Mortgage Ltd | Braintree | 2025 |
| Blacksword Limited | London | 2024 |
| Blacktail Limited | Manchester | 2024 |
| Blackthorn Advisors Ltd | Cardiff | 2025 |
| Blackthorn Analytics Ltd | Sheffield | 2025 |
| Blackthorn Capital Partners Ltd | London | 2021 |
| Blackthorn Court Financial Ltd | Bridgend | 2021 |
| Blackthorn Finance Ltd | London | 2016 |
| Blackthorn Financial Services Ltd | Daventry | 2021 |
| Blackthorn Gaming Limited | Colchester | 2025 |
| Blackthorn Hudson Group Ltd | Newbury | 2026 |
| Blackthorn Intermediaries Ltd | Doncaster | 2014 |
| Blackthorn Investment Group Limited | Manchester | 2019 |
| Blackthorn Mortgages Limited | Tugby | 2021 |
| Blackthorn Private Ltd | Huddersfield | 2026 |
| Blackthorn Risk Group Limited | London | 2017 |
| Blackthorn Specialty Ltd | Woodbridge | 2025 |
| Blackthorn Ventures Holding Ltd | Cardiff | 2025 |
| Blackthorns 61 Limited | Brierley Hill | 2012 |
| Blackties Holdings Ltd | London | 2025 |
| Blacktooth Limited | Cheadle | 2024 |
| Blackvault Group Ltd | London | 2026 |
| Blackwater Capital International Ltd | Egham | 2021 |
| Blackwater Capital Investments Limited | London | 2026 |
| Blackwater Financial Limited | Colchester | 2016 |
| Blackwater Group Limited | Nottingham | 1994 |
| Blackwater Holdings Ltd | Aldershot | 2000 |
| Blackwater Investments Limited | London | 1996 |
| Blackwater Offshore Wind Holdco Limited | Edinburgh | 2022 |
| Blackwater Wealth Management Limited | Chelmsford | 2012 |
| Blackwaterfoot Holdings Ltd | Ellesmere Port | 2024 |
| Blackwell & Co. Holdings Limited | Saltash | 2026 |
| Blackwell Bate Holdings Limited | Nottingham | 2026 |
| Blackwell Capital Ltd | Bexhill | 2026 |
| Blackwell Dane Holdings Ltd | Hyde | 2025 |
| Blackwell Financial Solutions Ltd | Leeds | 2020 |
| Blackwell Global AIM Ltd | London | 2022 |
| Blackwell Global Investments (UK) Limited | London | 2014 |
| Blackwell Group NE Ltd | Stockton-On-Tees | 2025 |
| Blackwell Mortgage Solutions Limited | Leeds | 2022 |
| Blackwell Private Wealth Ltd | London | 2020 |
| Blackwell Social Housing Ltd | Coventry | 2026 |
| Blackwolph Capital & Co. Limited | London | 2019 |
| Blackwood AOO Holdings Ltd | London | 2026 |
| Blackwood Bidco Limited | London | 2019 |
| Blackwood Capital Group (UK) Limited | London | 2014 |
| Blackwood Capital Partners Ltd | London | 2023 |
| Blackwood Creative Group Limited | Brighton | 2022 |
| Blackwood Finance Limited | Stoke-On-Trent | 2024 |
| Blackwood Financial Group Ltd | London | 2026 |
| Blackwood Group Holding Limited | Wembley | 2025 |
| Blackwood Hall Holdings Ltd | Selby | 2024 |
| Blackwood Holdings Limited | Kilmarnock | 2017 |
| Blackwood Investment Group Ltd | Cheadle | 2019 |
| Blackwood Investment Portfolio Ltd | Wembley | 2025 |
| Blackwood Management (Yorkshire) 2 Limited | Horsforth | 2022 |
| Blackwood Midco Limited | London | 2019 |
| Blackwood Stratton Company Limited | London | 2017 |
| Blackwoods Group Ltd | Bury St. Edmunds | 2025 |
| Blacwater Brokers Ltd | Enfield | 2023 |
| Blacwater Group Ltd | London | 2023 |
| Blade Acquisition Limited | Altrincham | 2018 |
| Blade Automotive Group Limited | Salisbury | 2024 |
| Blade Bidco Limited | Peterborough | 2025 |
| Blade Capital Limited | Witney | 2018 |
| Blade Holdco Limited | London | 2023 |
| Blade Holdings Limited | Reading | 2018 |
| Blade Investments Limited | Wetherby | 2022 |
| Blade Motor Cycles Holdings Limited | Salisbury | 2015 |
| Blade Motor Group Holdings Limited | Salisbury | 2015 |
| Blade Topco Limited | Peterborough | 2025 |
| Blade UK JV Bidco Limited | London | 2025 |
| Blade UK JV Midco Limited | London | 2025 |
| Bladen Investments Limited | Ipswich | 2022 |