| Blueco Data Limited | London | 2024 |
| Bluecoat Wills & Trusts Limited | Southwick | 2017 |
| Bluecore Capital Ltd | Derby | 2023 |
| Bluecrest Capital Holdings Ltd | Preston | 2025 |
| Bluecrest Capital UK Limited | London | 2010 |
| Bluecrest Investments Limited | Leeds | 2026 |
| Bluecrest Ventures Holdings Ltd | Leicester | 2026 |
| Bluecroft Associates Limited | Kington | 2010 |
| Bluecroft Brokers Limited | Altrincham | 2019 |
| Bluecroft Finance Limited | Altrincham | 2022 |
| Bluecroft Finance Subco 1 Limited | Altrincham | 2024 |
| Bluecroft Finance Subco 2 Limited | Altrincham | 2024 |
| Bluecroft Finance Subco 3 Limited | Altrincham | 2024 |
| Bluecroft Finance Subco 4 Limited | Altrincham | 2024 |
| Bluecroft Finance Subco 5 Limited | Altrincham | 2025 |
| Bluecroft Finance Subco 6 Limited | Altrincham | 2025 |
| Bluecroft Finance Subco 7 Limited | Altrincham | 2025 |
| Bluecroft Finance Subco 8 Limited | Altrincham | 2025 |
| Bluecroft Holdings Limited | Altrincham | 2025 |
| Bluecroft Property Ventures Limited | Finchley | 2018 |
| Bluecube Group Limited | Milton Keynes | 2023 |
| Bluecube Holdings Limited | Milton Keynes | 2023 |
| Bluedawn Corporation Limited | Cheshire | 2001 |
| Blueday Holdings Limited | Banstead | 2022 |
| Bluediamond Investors Limited | Orpington | 2022 |
| Bluedog International Holdings Limited | Farnham | 2023 |
| Bluedoor UK Limited | Worthing | 2024 |
| Bluedrive Global Investors Services (UK) Limited | London | 2016 |
| Bluedrop Services (Holdings) Limited | Southampton | 2019 |
| Bluedrop Services (NW) Limited | Southampton | 2010 |
| Blueearth Tuna Access Ltd. | London | 2026 |
| Bluefield Holdings Limited | Ulverston | 2021 |
| Bluefield Renewable Developments Europe Limited | Bristol | 2023 |
| Bluefield SIF Investments Limited | Gatwick | 2013 |
| Bluefields Asset Management Ltd | Luton | 2023 |
| Bluefields Wealth Limited | Cobham | 2017 |
| Bluefin Business Capital Limited | Sutton Coldfield | 2026 |
| Bluefin Holdings NW Ltd | Oldham | 2025 |
| Bluefin Insurance Group Limited | Liverpool | 1996 |
| Bluefin Minerals UK Limited | Kingston | 2026 |
| Bluefin Strategy Ltd | Northwood | 2023 |
| Bluefinch Holdco Limited | London | 2026 |
| Bluefinch Wealth Limited | London | 2016 |
| Bluefish Global Payroll Services Limited | London | 2012 |
| Bluefishents Ltd | Crawley | 2025 |
| Bluefjord Ltd | London | 2024 |
| Blueflame Holdings Limited | Chesterfield | 2023 |
| Bluefly IT Services Ltd | Cardiff | 2024 |
| Blueforest Bidco Limited | London | 2025 |
| Blueforest Midco Limited | London | 2025 |
| Blueforest Topco Limited | London | 2025 |
| Blueforge Holdings Ltd | Sheffield | 2025 |
| Bluefox Capital Management Ltd | London | 2020 |
| Bluefriars Brokers Limited | Buntingford | 2013 |
| Bluefriars Group Limited | Buntingford | 2013 |
| Bluefriars Training and Consultancy Limited | Buntingford | 2016 |
| Bluefrog Holdings Ltd | Barnstaple | 2025 |
| Bluefunding Limited | London | 2024 |
| Bluefuse Investments Limited | Bath | 2020 |
| Bluegate Finance Ltd | Leeds | 2022 |
| Bluegates Farming Enterprises Limited | Baldock | 2010 |
| Bluegill Limited | Stockport | 2024 |
| Blueglen Investment Partners Limited | London | 2016 |
| Blueglow Global Limited | Birmingham | 2025 |
| Bluegrace Energy Ltd | London | 2021 |
| Bluegreen Holdings Ltd | Kettering | 2022 |
| Bluegreen Oasis Ltd | Canterbury | 2022 |
| Bluegroup Bidco Limited | London | 2019 |
| Bluegroup Ipco Limited | London | 2019 |
| Bluegroup Propco Limited | London | 2019 |
| Bluegrove Capital Management Ltd | London | 2018 |
| Bluegrove Wealth Limited | Harpenden | 2015 |
| Bluehall Debenture Company Limited | London | 2026 |
| Bluehaus Holdings Limited | Warwick | 2024 |
| Bluehaven Capital Partners Limited | Petersfield | 2010 |
| Bluehaven Investments Limited | Petersfield | 2017 |
| Bluehaven Markets Limited | Stroud | 2025 |
| Bluehome Group Ltd | London | 2024 |
| Bluehorse Finance Limited | Wakefield | 2006 |
| Bluehub Group Limited | Telford | 2025 |
| Blueide Holdings Limited | Godalming | 2026 |
| Bluejay Financial Planning Ltd | Nottingham | 2014 |
| Bluejay Holdings Ltd | London | 2020 |
| Bluejohn Solutions Limited | London | 2021 |
| Bluekeep Investments Limited | London | 2015 |
| Bluelake Capital Ltd | London | 2024 |
| Bluelaurel Limited | Weybridge | 2003 |
| Blueld Ltd | London | 2021 |
| Blueledgertrading Ltd | London | 2026 |
| Bluelight Lifetime Partners Limited | St. Albans | 2013 |
| Blueline (Midlands) Limited | Stafford | 2024 |
| Blueline Financial Services Limited | Cardiff | 2021 |
| Blueline Group (Derby) Limited | Derby | 2023 |
| Bluemac Mortgages Ltd | Worksop | 2022 |
| Bluemethane Group Ltd | London | 2021 |
| Bluemont Group Ltd | Lancing | 2026 |
| Bluenose 1875 Ltd | Chesham | 2023 |
| Blueoak Group Holdings Ltd | London | 2025 |
| Blueora Ltd | Hungerford | 2024 |
| Blueorchard Sustainable Assets Company Limited | Whiteley | 2023 |