| Bess Investment Holdings Limited | Edinburgh | 2026 |
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| Bessant Investments Limited | Salisbury | 2017 |
| Bessborough Assets Limited | London | 1999 |
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| Bessimer Limited | Biggleswade | 2022 |
| Besso Insurance Services Limited | London | 1994 |
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| Best (Insurance) Services Limited | Edgware | 2005 |
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| Best Advice Mortgage Brokers Limited | Bexhill-On-Sea | 2026 |
| Best Advice Protection Ltd | Bexhill-On-Sea | 2009 |
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| Best Asset Management Ltd | Wolston | 2010 |
| Best Before Town Ltd | London | 2024 |
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| Best Capital Limited | London | 2009 |
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| Best Energy Bidco Limited | Bristol | 2026 |
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| Best Exchange Limited | London | 2014 |
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| Best Financial Group Ltd | Billericay | 2015 |
| Best Financial Planning Ltd | Oxford | 2006 |
| Best Financial Services Limited | Euxton Lane, Chorley | 2017 |
| Best Financial Solutions Limited | Hove | 2003 |
| Best Fit Investments Limited | Oldham | 2018 |
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| Best Forex Private Ltd | Romford | 2016 |
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| Best Group Holdings Ltd | Cardiff | 2021 |
| Best Health Protect Limited | Hornchurch | 2009 |
| Best Holdings (UK) B 2 Limited | West Thurrock | 2025 |
| Best Holdings (UK) Limited | London | 2013 |
| Best Holdings Group Limited | London | 2019 |
| Best Hospitality London Limited | Wembley | 2018 |
| Best Inn Welfare Trust Ltd | Ilford | 2025 |
| Best Insurance Ltd | Brighton | 2004 |
| Best Intentions Analytics Limited | Brentford | 2025 |
| Best Investment Limited | London | 1988 |
| Best Life Financial Planning Ltd | Bognor Regis | 2018 |
| Best Life Wealth Partners Limited | Eastbourne | 2026 |
| Best Little Holdings Co. Limited | Stamford | 2018 |
| Best Mortgage Adviser Ltd | Bristol | 2018 |
| Best Mortgage Direct Limited | Dunfermline | 2008 |
| Best Mortgage Fit UK Limited | Erskine | 2024 |
| Best Mortgage Ltd | Hayes | 2015 |
| Best Mortgage Product Ltd | Farnham | 2019 |
| Best Mortgages & Protection Limited | Bishop'S Stortford | 2017 |
| Best Park Home Finance Ltd | London | 2010 |
| Best Practice Academy Ltd | Farnham | 2020 |
| Best Practice IFA Group Limited | Horsham | 2002 |
| Best Price Financial Services Ltd | Port Talbot | 2011 |
| Best Protect Limited | Havant | 2018 |
| Best Protect Online Ltd | Exeter | 2014 |
| Best Quant Capital Limited | Nottingham | 2026 |
| Best Rate Group Limited | Hemel Hempstead | 2011 |
| Best Rate Mortgages Limited | London | 2013 |
| Best Risk Management and Financial Service Limited | Brighton | 2009 |
| Best Roofing Holdings and Investments Ltd | Dudley | 2026 |
| Best Secure Limited | Stevenage | 2009 |
| Best Solution Mortgages Ltd | London | 2018 |
| Best Star Real Estate Fedaia Ltd | London | 2021 |
| Best Sunbeds Holdings Limited | High Wycombe | 2024 |
| Best Tennis & Mortgages Ltd | Poole | 2016 |
| Best to Invest Limited | Stamford | 2001 |
| Best Trans & Raptor Ltd | Hemel Hempstead | 2012 |
| Best Value Money Exchange Limited | London | 2021 |
| Best.E Holdings Limited | Norwich | 2021 |
| BEST4FINANCE Limited | Loughborough | 2019 |
| Besta Group Limited | London | 2024 |
| Bestatdigital Holdings Limited | Worthing | 2020 |
| Bestcarleasing Ltd | Wolverhampton | 2024 |
| Bestchange Ltd | London | 2025 |
| Bestemt Limited | London | 2025 |
| Bestex Research Ltd | London | 2024 |
| Bestfield Investments | Birmingham | 2016 |
| Bestford Insurance Brokers Ltd | Wallsend | 2021 |
| Bestinvest (Consultants) Limited | London | 1981 |
| Bestinvest (Holdings) Limited | London | 1997 |
| Bestla UK Limited | London | 2023 |
| Bestline Data Ltd | St Katharines Way | 2001 |
| Bestodeck Limited | Warwick | 1982 |
| Bestpark International Limited | London | 1990 |
| Bestport General Partner Limited | London | 2003 |
| Bestport Private Equity Limited | London | 2018 |
| Bestquote Group Limited | Luton | 2018 |
| Bestright Asia Limited | London | 2026 |
| Bestspread International Limited | Croydon | 2019 |