| Blue Whale Asset Management Limited | London | 2017 |
| Blue Whale Group Limited | London | 2012 |
| Blue Whale Investment Management Limited | London | 2017 |
| Blue Whale London Ltd | Upminster | 2015 |
| Blue Whales Holdings Limited | Croydon | 2022 |
| Blue WIG Holdings Ltd | Dartford | 2022 |
| Blue Willow Holdings Ltd | Slough | 2024 |
| Blue Wind Marine Protection and Indemnity Brokers Ltd | London | 2023 |
| Blue Wire Capital Ltd | London | 2013 |
| Blue Wisdom First Ltd | London | 2026 |
| Blue Wolf Holdings Limited | Lancaster | 2016 |
| Blue Wolf Investments Ltd | Walsall | 2026 |
| Blue Wolf Security Ltd | Birmingham | 2021 |
| Blue World Financial Solutions Ltd | Ellesmere Port | 2024 |
| Blue Wren Group Limited | Preston | 2021 |
| Blue Yonder Holdings Limited | London | 2025 |
| Blue Yonder Property Holdings Limited | Henley In Arden | 2020 |
| Blue Zulu Consultancy Limited | Tunbridge Wells | 2008 |
| Blue-H Capital Partners Ltd | London | 2021 |
| Blue-Xii Ventures Ltd | London | 2026 |
| BLUE14 SPV Ltd | London | 2026 |
| Bluearch Investment Ltd | Wickford | 2026 |
| Bluebase Group Holdings Ltd | Halesowen | 2024 |
| Bluebase Investments Limited | Halesowen | 2021 |
| Bluebay Asset Management (Services) Ltd | London | 1996 |
| Bluebay Asset Management Corporation Ltd | London | 2017 |
| Bluebay Asset Management International Limited | London | 2004 |
| Bluebay Capital Limited | East Horsley | 2014 |
| Bluebay Securities Limited | London | 2019 |
| Bluebear Markets Ltd | Bishopton | 2025 |
| Bluebell 1 Limited | London | 2019 |
| Bluebell 2 Limited | London | 2019 |
| Bluebell Capital Investments Limited | Manchester | 2020 |
| Bluebell Capital Limited | London | 2013 |
| Bluebell Cars Bidco Limited | Gillingham | 2022 |
| Bluebell Cars Holding Limited | London | 2022 |
| Bluebell Cars Midco Limited | Gillingham | 2022 |
| Bluebell Cars Topco Limited | Gillingham | 2022 |
| Bluebell Cars Ultimate Holding Limited | London | 2022 |
| Bluebell Cottage (2026) Ltd | Grantham | 2026 |
| Bluebell Financial Management Limited | Honiton | 2022 |
| Bluebell Financial Services Ltd | Northampton | 2019 |
| Bluebell Funding UK Ltd | Addlestone | 2020 |
| Bluebell Group (Midlands) Limited | Birmingham | 2025 |
| Bluebell Kempsford Ltd | Chippenham | 2024 |
| Bluebell Legacy Limited | Birmingham | 2024 |
| Bluebell Mortgage and Protection Solutions Ltd | Leeds | 2019 |
| Bluebell Mortgages Ltd | Ipswich | 2015 |
| Bluebell Prestige Limited | London | 2006 |
| Bluebell Wind Farm Holding Limited | Ringwood | 2017 |
| Bluebell Wind Farm Limited | Ringwood | 2017 |
| BLUEBELL22 Investment Ltd | London | 2022 |
| Bluebells Holdings Limited | Hailsham | 2026 |
| Blueberoni Limited | London | 2025 |
| Blueberry & Co Holdings Ltd | Bideford | 2019 |
| Blueberry Adviser Academy Limited | Dorchester | 2019 |
| Blueberry Boulevard Limited | London | 2023 |
| Blueberry Developments Limited | Billingham | 2022 |
| Blueberry Enterprises Trading Limited | South Woodford | 2026 |
| Blueberry Estate Planning Limited | Dorchester | 2017 |
| Blueberry Financial Ltd | Ascot | 2008 |
| Blueberry Fudge Holdings Ltd | Warwick | 2024 |
| Blueberry Life Ltd | London | 2018 |
| Blueberry Ventures Limited | Birmingham | 2024 |
| Blueberry Wealth Limited | Dorchester | 2013 |
| Bluebird (NHC) Limited | Piddington | 2019 |
| Bluebird Assets Ltd | Godalming | 2017 |
| Bluebird Bidco Limited | Birmingham | 2024 |
| Bluebird Financial Services Ltd | Cardiff | 2019 |
| Bluebird Finco Limited | Birmingham | 2024 |
| Bluebird Group Limited | London | 2021 |
| Bluebird Midco Limited | Birmingham | 2024 |
| Bluebird Topco Limited | Birmingham | 2024 |
| Bluebird Treasury Services Limited | London | 2010 |
| Bluebirds Investments Ltd | Billingham | 2026 |
| Bluebond Property Tax Limited | Royston | 2026 |
| Bluebond Tax Planning Ltd | Royston | 2019 |
| Bluebonnet Holdings Ltd | London | 2024 |
| Bluebottle UK Limited | London | 1999 |
| Bluebow Group Ltd | London | 2026 |
| Bluebox Asset Management UK Limited | London | 2018 |
| Bluebox Corporate Finance Limited | London | 2012 |
| BLUEBOX7000 Limited | Colchester | 2007 |
| Bluebridge Consult Limited | Wolverhampton | 2017 |
| Bluebridge Financial Planners Limited | Bishops Stortford | 2012 |
| Bluebridge Holding Group Ltd | Brentford | 2023 |
| Bluebug Holdings Limited | Waltham Cross | 2023 |
| Bluecap Associates Limited | London | 2025 |
| Bluecap Compliance Ltd | London | 2020 |
| Bluecap Corporation Limited | Canvey Island | 2017 |
| Bluecap International Limited | London | 2025 |
| Bluecat IP Limited | Cambridge | 2021 |
| Bluechain Payments Limited | Maidenhead | 2017 |
| Bluechip Estates & Investments Limited | Leeds | 2025 |
| Bluechip Financial Ltd | Broadstone | 2007 |
| Bluechip Title Solutions Ltd | Newry | 2007 |
| Blueco 22 Limited | London | 2022 |
| Blueco 22 Midco Limited | London | 2022 |
| Blueco 22 Properties Limited | London | 2022 |
| Blueco 22 Residential Limited | London | 2023 |