| Boontown Holdings Limited | Settle | 2023 |
| Boontricks Limited | London | 2025 |
| Boop Group Ltd | Ashton-Under-Lyne | 2026 |
| Boop UK Ltd | Edinburgh | 2026 |
| Boorman Holdings Limited | Heathfield | 2023 |
| Booroo Holdings Limited | Bristol | 2012 |
| Boosey Mortgages Ltd | Canvey Island | 2022 |
| Boosst Financial Limited | Milton Keynes | 2017 |
| Boosst Limited | Hulcote | 2005 |
| Boost Asset Finance Ltd | Manchester | 2022 |
| Boost Bookkeeping & Accounts Limited | London | 2010 |
| Boost Capital Partners GP I Limited | London | 2023 |
| Boost Capital Partners Ltd | London | 2022 |
| Boost Commerce UK Ltd | Leicester | 2023 |
| Boost Finance Group Ltd | Altrincham | 2026 |
| Boost Finance Ltd | Sheffield | 2026 |
| Boost Financial Services Limited | Kettering | 2021 |
| Boost FS Group UK Ltd | London | 2025 |
| Boost Holdings Ltd | London | 2021 |
| Boost Mortgages Ltd | Camberley | 2025 |
| Boost Wealth Limited | Newport | 2024 |
| Boost&Co Limited | London | 2011 |
| Boostfocal Limited | Ely | 2002 |
| Boostgy Limited | Great Yarmouth | 2021 |
| Boot Hill Investments Ltd | Evesham | 2024 |
| Boote Financial Planning Limited | Cheltenham | 2009 |
| Booterstown Group Ltd | Ipswich | 2024 |
| Booth Financial Services Limited | Chelmsford | 2003 |
| Booth FS Group Ltd | Doncaster | 2025 |
| Booth Group Holdings Limited | Warrington | 2020 |
| Booth Group Limited | Blackpool | 2019 |
| Booth Holdings Limited | Brockenhurst | 2017 |
| Booth White Asset Management Limited | Gillingham | 2023 |
| Booth, Wasserman Limited | | 1975 |
| Bootham Insurance Services Limited | Stockport | 2021 |
| Bootham Pensions and Investments Limited | York | 2017 |
| Boothman Holdings Ltd | Eastbourne | 2024 |
| Boothroyd Property Group Limited | Coventry | 2025 |
| Booths Group Ltd | Tyldesley | 2022 |
| Boothswood Limited | Belper | 2017 |
| Boothwood Holdings Ltd | Halifax | 2017 |
| Bootland Group Holdings Ltd | Ossett | 2019 |
| Boots Farm Holdings Limited | Rugby | 2024 |
| Boots Optical Investment Holdings Limited | Nottingham | 2009 |
| Boots Pensions Limited | | 1935 |
| Boots Propco D Limited | Edinburgh | 2011 |
| Boots Propco E Limited | Edinburgh | 2011 |
| Boots Supplementary Plan Trustee Limited | Nottingham | 2025 |
| Bootstrap Finance Limited | Tring | 2025 |
| Bootstrap Trading (London) Ltd | London | 2019 |
| Boovcorp Ltd | Farnham | 2025 |
| Boozaa Ltd | London | 2026 |
| BOP (GP) Holdings Limited | London | 2010 |
| Bopa UK Holdings Limited | London | 2017 |
| Boparan Manufacturing Group Limited | Birmingham | 2016 |
| Boparan Private Office Limited | Birmingham | 2021 |
| Boparan Restaurants Holdings Limited | Birmingham | 2016 |
| Bopharm Investments Ltd | Limavady | 2022 |
| Boquerones Holdings Limited | London | 2023 |
| BOR Holdings Limited | Aylesbury | 2025 |
| Boralex Operations (Scotland) Ltd | Edinburgh | 2020 |
| Boram Holdings Ltd | Derby | 2023 |
| Boramaz Ltd | Hatch End | 2023 |
| Bordage Limited | Tothill Street | 2002 |
| Bordas Holdings Ltd | Grimsby | 2024 |
| Bordeaux UK Holdings I Limited | Marlow | 2017 |
| Bordeaux UK Holdings II Limited | Marlow | 2017 |
| Bordeaux UK Holdings III Limited | Marlow | 2017 |
| Bordeaux-Atelier Ltd | London | 2024 |
| Borden Limited | Enfield | 2007 |
| Border Embroideries Holdings Limited | Duns | 2025 |
| Border Farm Properties Limited | Ely | 2016 |
| Border Finance Limited | Dumfries | 2009 |
| Border Financial Advice Limited | Oswestry | 2021 |
| Border Group Holdings Limited | Wrexham | 2018 |
| Border Holdings Limited | Edinburgh | 2025 |
| Border Investments Ltd | Carlisle | 2013 |
| Border Oak Investments Limited | Crawley | 2023 |
| Border PAY Limited | Belfast | 2026 |
| Border Reiver Investment Company Limited | Taunton | 2021 |
| Border Rock Holdings Limited | Peterborough | 2021 |
| Border to Coast Bedfordshire GP Limited | Edinburgh | 2019 |
| Border to Coast Cambridgeshire GP Limited | Edinburgh | 2026 |
| Border to Coast Cumbria GP Limited | Edinburgh | 2019 |
| Border to Coast Durham GP Limited | Edinburgh | 2019 |
| Border to Coast East Riding GP Limited | Edinburgh | 2019 |
| Border to Coast East Sussex GP Limited | Edinburgh | 2026 |
| Border to Coast Essex GP Limited | Edinburgh | 2026 |
| Border to Coast Global Core Real Estate GP Limited | Edinburgh | 2023 |
| Border to Coast Global Value-Add Real Estate GP Limited | Edinburgh | 2023 |
| Border to Coast Global Value-Add Real Estate II GP Limited | Edinburgh | 2026 |
| Border to Coast Hertfordshire GP Limited | Edinburgh | 2026 |
| Border to Coast Kent GP Limited | Edinburgh | 2026 |
| Border to Coast North Yorkshire GP Limited | Edinburgh | 2019 |
| Border to Coast Northamptonshire GP Limited | Edinburgh | 2026 |
| Border to Coast Pensions Partnership Limited | Leeds | 2017 |
| Border to Coast South Yorkshire GP Limited | Edinburgh | 2019 |
| Border to Coast Surrey GP Limited | Edinburgh | 2019 |
| Border to Coast Teesside GP Limited | Edinburgh | 2019 |
| Border to Coast Tyne & Wear GP Limited | Edinburgh | 2019 |