| Blackrock American Income Trust PLC | London | 2012 |
| Blackrock Asset Management Investor Services Limited | London | 1993 |
| Blackrock Asset Management UK Limited | London | 1986 |
| Blackrock Capital Limited | Coleraine | 2010 |
| Blackrock Crane Limited | London | 2023 |
| Blackrock Diversified Private Debt Fund GP Limited | Edinburgh | 2020 |
| Blackrock Diversified Private Debt Nominees Limited | London | 2021 |
| Blackrock Energy and Resources Income Trust PLC | London | 2005 |
| Blackrock Energy and Resources Securities Income Company Limited | London | 2005 |
| Blackrock Evergreen Infrastructure UK Finco Limited | London | 2024 |
| Blackrock Evergreen Infrastructure UK Holdings Limited | London | 2023 |
| Blackrock Finance Europe Limited | London | 2009 |
| Blackrock Finco UK Ltd | London | 2006 |
| Blackrock Frontiers Investment Trust PLC | London | 2010 |
| Blackrock Fund Managers Limited | London | 1973 |
| Blackrock Gpco, (Scotland) Ltd | Edinburgh | 2024 |
| Blackrock Greater Europe Investment Trust PLC | London | 2004 |
| Blackrock Group Limited | London | 1969 |
| Blackrock IMG Limited | London | 2021 |
| Blackrock Income and Growth Investment Trust PLC | London | 2001 |
| Blackrock International Limited | Edinburgh | 1995 |
| Blackrock Investment Management (UK) Limited | London | 1986 |
| Blackrock Investments Limited | Bristol | 1981 |
| Blackrock Latin American Investment Trust PLC | London | 1990 |
| Blackrock Life Limited | London | 1988 |
| Blackrock Mortgages & Protection Limited | Caldicot | 2026 |
| Blackrock Pensions Limited | London | 1989 |
| Blackrock Private Equity Ltd | London | 2025 |
| Blackrock Smaller Companies Trust PLC | Edinburgh | 1906 |
| Blackrock Throgmorton Trust PLC | London | 1957 |
| Blackrock UK (Alpha) Limited | London | 2016 |
| Blackrock UK (Beta) Limited | London | 2016 |
| Blackrock UK (Gamma) Limited | London | 2018 |
| Blackrock UK (Sigma) Limited | London | 2016 |
| Blackrock UK Holdco 2 Limited | London | 2019 |
| Blackrock UK Holdco 3, Ltd | London | 2025 |
| Blackrock UK Holdco Limited | London | 1981 |
| Blackrock Uwekeza Ltd | London | 2022 |
| Blackrock World Mining Investment Company Limited | London | 1993 |
| Blackrock World Mining Trust PLC | London | 1993 |
| Blackrock Yachting (Holdings) Limited | Eastleigh | 2025 |
| Blackroot Limited | Burton-On-Trent | 2009 |
| Blackrow Group Limited | North East Lincolnshire | 2023 |
| Blackrow Holdings Limited | Industrial Estate Grimsby | 2003 |
| Blacks Capital Limited | Bathgate | 2025 |
| Blacks Estate Holdings Ltd | Taunton | 2026 |
| Blacks FX Limited | London | 2022 |
| Blacksco 36 Limited | Ilkley | 2014 |
| Blacksheep Design Collectives Holdings Limited | Deal | 2025 |
| Blackshield Holding Ltd | London | 2025 |
| Blackshield Investments Ltd | London | 2023 |
| Blackship Capital Limited | London | 2023 |
| Blackshire Group Ltd | London | 2025 |
| Blackshore Limited | Northampton | 2006 |
| Blacksilk Ltd | London | 2024 |
| Blackskull Investments Limited | Banbridge | 2026 |
| Blacksmith and Brigantine Company Limited | London | 2018 |
| Blacksmith Enterprises Limited | London | 2003 |
| Blacksmith Holdings (2021) Limited | Bradford | 2021 |
| Blacksmiths and Craftsmen Limited | London | 2024 |
| Blacksmiths Cottage Limited | Burton On Trent | 2013 |
| Blackspot Holdings Ltd | Clifton Moor | 2024 |
| Blacksquare Advisory Limited | Manchester | 2018 |
| Blacksquare Advisory Topco Limited | Manchester | 2022 |
| Blackstable Limited | Bristol | 2010 |
| Blackstaff (Holdings) Ltd | Belfast | 2017 |
| Blackstairs Invest Limited | London | 2019 |
| Blackstar 2016 Limited | London | 2016 |
| Blackstar Asset Management Limited | Northampton | 2025 |
| Blackstar Business Solutions Ltd | London | 2022 |
| Blackstar Enterprises Ltd | London | 2023 |
| Blackstar Finance Limited | Croydon | 2011 |
| Blackstar Holdings RWL Limited | London | 2025 |
| Blackstar IP Limited | Glasgow | 2023 |
| Blackstar Management Holdings Ltd | London | 2021 |
| Blackstar Mortgages Ltd | Redditch | 2023 |
| Blackstar Trading & Finance Ltd | London | 2019 |
| Blackstar Ventures Limited | Chester | 2019 |
| Blackstar Wealth Management a Ltd | Walsall | 2009 |
| Blackstar Wealth Management Ltd | Birmingham | 2008 |
| Blackstock Financial Services Ltd. | Dudley | 2011 |
| Blackstock Private Equity Ltd | Dudley | 2023 |
| Blackstock Pro Limited | London | 2025 |
| Blackstock Services Limited | Cardiff | 2016 |
| Blackstone Business Finance Ltd | Sheffield | 2008 |
| Blackstone Capital Partners Ltd | London | 2024 |
| Blackstone Dragon Limited | London | 2021 |
| Blackstone Elite Capital Ltd | London | 2024 |
| Blackstone Equity Ltd | Norwich | 2019 |
| Blackstone Finance Limited | London | 1997 |
| Blackstone Financial Advice Ltd | London | 2012 |
| Blackstone Financial Management Limited | Cheadle | 2014 |
| Blackstone Holding Group Ltd | London | 2026 |
| Blackstone Holdings Limited | Hitchin | 2019 |
| Blackstone Homes Group Ltd | London | 2018 |
| Blackstone IND Limited | Preston | 2019 |
| Blackstone Independent Financial Advisers (Midlands) Limited | Pershore | 2012 |
| Blackstone Insurance Brokers Limited | Watford | 2008 |
| Blackstone Island Ltd | London | 2019 |
| Blackstone Moregate Limited | 30 Crown Place | 1998 |