| Blankfactor Holdings UK Limited | London | 2021 |
| Blankpage UK Ltd | Harrow, | 2025 |
| Blankstone Sington Limited | Manchester | 1989 |
| Blantree Holdco Limited | London | 2021 |
| Blantree Midco Limited | London | 2022 |
| Blanturn Holdco Limited | London | 2021 |
| Blantyre Capital Investments Limited | London | 2022 |
| Blantyre Capital Limited | London | 2016 |
| Blaq Cat Global Holdings Ltd | Hindhead | 2025 |
| Blarney Capital UK Limited | London | 2025 |
| Blas NA Fiki Limited | Glasgow | 2026 |
| Blaseon Holdings Limited | East Goscote | 2025 |
| Blast Away (Holdings) Limited | Barnstaple | 2019 |
| Blast Enterprises Ltd | Oldham | 2025 |
| Blast Group Limited | Newport Pagnell | 2024 |
| Blastco Limited | Kilmarnock | 2006 |
| Blaston Group Ltd | London | 2025 |
| Blastore Holdings Ltd | Sheffield | 2025 |
| Blastr Green Steel Holdings Limited | Watford | 2025 |
| Blastworx (Holdings) Limited | Poole | 2023 |
| Blatchford Products Holdings Limited | Basingstoke | 2017 |
| Blatchford Solutions Limited | Bristol | 2024 |
| Blatt Holdings Limited | Stoke-On-Trent | 2016 |
| Blaxley Properties Ltd | Tring | 2023 |
| Blaxsell Financial Planning Ltd | Shefford | 2021 |
| Blaydon Holdings Limited | Blaydon On Tyne | 2014 |
| Blaydon Wealth Management Limited | Harrow | 2026 |
| Blayze Group Holdings Limited | London | 2022 |
| Blaze Bidco Limited | Leamington Spa | 2020 |
| Blaze Compliance Ltd | Brighton | 2026 |
| Blaze Dental and Aesthetics Limited | Peterborough | 2021 |
| Blaze Financial Ltd | Wigan | 2023 |
| Blaze Holdings Limited | Bath | 2015 |
| Blazehill Capital Finance Limited | London | 2019 |
| Blazehill Capital Limited | London | 2020 |
| Blazehill Credit Opportunities Limited | London | 2023 |
| Blazehill Opportunities Limited | London | 2023 |
| Blazehill Special Opportunities Limited | London | 2023 |
| Blazehill Strategic Investments Limited | London | 2023 |
| Blazemoney FX Ltd | London | 2025 |
| Blazey Limited | Truro | 2024 |
| Blazing Barrell Smokeworks Ltd | Ipswich | 2024 |
| Blazing Star Greater China Holdings Ltd | London | 2025 |
| Blazro Holdings Limited | Nelson | 2013 |
| BLB Decorating and Painting Ltd | London | 2023 |
| BLB Freight Limited | Wilmslow | 2024 |
| BLB Home Group Ltd | Hebden Bridge | 2024 |
| BLB Solicitors Holdings Limited | Trowbridge | 2022 |
| BLC Holdings Limited | Bradford | 2019 |
| BLC I GP Member Ltd | London | 2020 |
| BLC I Nominee Ltd | London | 2020 |
| BLC II GP Member Ltd | London | 2021 |
| BLC II Nominee Ltd | London | 2021 |
| BLC III GP Member Ltd | London | 2024 |
| BLC III Nominee Ltd | London | 2024 |
| BLC NO1 Limited | Manchester | 2014 |
| Blco Ltd | Southampton | 2002 |
| Blcp Devon ST Midco Ltd | London | 2024 |
| Blcp Devon ST Propco Ltd | London | 2024 |
| Blcp Management Services Limited | London | 2018 |
| Blcp RS Holdco Ltd | London | 2022 |
| Blcp RS Holdco V Ltd | London | 2024 |
| Blcp RS Midco Ltd | London | 2022 |
| BLD Ltd | Romford | 2019 |
| BLD Protection Ltd | Bedford | 2021 |
| Bldh Holdings Limited | London | 2025 |
| BLE Enterprises Ltd | Norwich | 2020 |
| Bleackley Holdings Limited | Chesterfield | 2024 |
| Bleak House Holdings Limited | Sheffield | 2026 |
| Bleaklow Holdings Limited | Swadlincote | 2021 |
| Bleansley Financial Services Ltd | Kirkby In Furness | 2011 |
| Bleary Finance Company Limited | Craigavon | 2013 |
| Blelham Limited | York | 2019 |
| Blemain Finance Limited | Cheadle | 1974 |
| Blemish Holdings Limited | Bury | 2020 |
| Blencowe Resources PLC | London | 2017 |
| Blencowes of Brackley Limited | Brackley | 2021 |
| Blend (Security Trustee) Limited | London | 2017 |
| Blend Family Ltd | Sheffield | 2023 |
| Blend Funding PLC | London | 2018 |
| Blend Group Holdings Limited | Bristol | 2024 |
| Blend Holdings Limited | Hitchin | 2021 |
| Blend Loan Network Limited | London | 2016 |
| Blend on the Group Ltd | Bournemouth | 2026 |
| Blends Group Ltd | Prescot | 2023 |
| Blendworth Holdings Ltd | Gosport | 2024 |
| Blenesis Limited | Liverpool | 2025 |
| Blenheim Barnes Limited | Chelmsford | 2010 |
| Blenheim Capital Real Estate Limited | London | 2022 |
| Blenheim Capital Services Limited | Reading | 2019 |
| Blenheim Crossharbour Ltd | London | 2016 |
| Blenheim Dash Limited | Sidcup | 2022 |
| Blenheim Digital Ltd | Brighton | 2016 |
| Blenheim Financial Limited | Leeds | 2025 |
| Blenheim Financing 2021-1 Limited | London | 2021 |
| Blenheim Group Limited | Leatherhead | 2000 |
| Blenheim House Holding Company Ltd | Thetford | 2021 |
| Blenheim Partnerships Limited | London | 2019 |
| Blenheim Realty (North London) Ltd | Bushey | 2018 |
| Blenheim Road Holdings Limited | Stratford-Upon-Avon | 2016 |