| Baillie Windfarm Holdings Limited | London | 2011 |
| Bailum Ltd | Ramsgate | 2025 |
| Baily Garner Holdings Limited | London | 2025 |
| Bailye Holdings Ltd | Burntwood | 2022 |
| Bain & Bridges Limited | London | 2015 |
| Bain Capital Credit, Ltd. | London | 2005 |
| Bain Capital Investments (Europe) Limited | London | 2014 |
| Bain Capital UK GP Limited | London | 2001 |
| Bain Financial Ltd | Canterbury | 2026 |
| Bain Street Holding Ltd | Glasgow | 2025 |
| Bainbridge & Co Mortgages Limited | Northampton | 2022 |
| Bainbridge (UK) Services Limited | London | 2008 |
| Bainbridge Capital Partners Limited Ltd | London | 2025 |
| Bainbridge Financial Planning Limited | Canterbury | 2020 |
| Bainbridge Holdings Ltd | Norwich | 2023 |
| Bainbridge Investments Ltd | London | 2020 |
| Bainbridge Management Co Ltd | Leyburn | 2015 |
| Baines & Ernst Limited | London | 1996 |
| Baines Brokers Ltd | Wolsingham | 2025 |
| Baines Drejer Ltd | Bristol | 2021 |
| Baines Wealth Ltd | Walsall | 2015 |
| Bains Asset Management Limited | Leicester | 2019 |
| Bains Capital Limited | Mayfair | 2022 |
| Bains Financial Planning Limited | Watford | 2019 |
| Bains Financial Services Limited | Wolverhampton | 2018 |
| Bains Group Holdings Ltd | Huddersfield | 2024 |
| Bains Plant Hire Ltd | Sutton Coldfield | 2022 |
| Bains Private Finance Limited | Northampton | 2025 |
| Bains Venture Holdings Ltd | Bracknell | 2025 |
| Bains Wealth Management Ltd | Coventry | 2024 |
| Baird (General Partner) Limited | Edinburgh | 1998 |
| Baird Capital Partners Europe Limited | London | 1995 |
| Baird Foods EOT Trustee Limited | Burton-On-Trent | 2024 |
| Baird Holdings Limited | Belfast | 2024 |
| Baird Private Equity Limited | London | 1986 |
| Baird Secretaries Limited | London | 1980 |
| Bairds Malt (Pension Trustees) Ltd | Essex. | 1989 |
| Baire Holdings Ltd | Croydon | 2024 |
| Bairstow's Group Limited | Leeds | 2022 |
| Baisley Midco Limited | London | 2020 |
| Baisley Topco Limited | London | 2020 |
| Baiy Holdings Ltd | Sheffield | 2025 |
| BAJ Property Ltd | Scunthorpe | 2023 |
| Baja Investments Ltd | Warrington | 2018 |
| Bajaria Capital Investments Limited | Harrow | 2018 |
| Bajaria Group Limited | Harrow | 2018 |
| Bajf Holdings Limited | Evesham | 2021 |
| Bajs Investments Limited | West Farndon | 2023 |
| Bajwa & Najran Group Ltd | Oldbury | 2023 |
| BAK Management Ltd | Bristol | 2022 |
| Baka Holdings Limited | Leeds | 2026 |
| Bakaal Worldwide Limited | London | 2010 |
| Bakab Holdings Ltd | Lytham St. Annes | 2021 |
| Bakai Holding Ltd | London | 2025 |
| Bakare Holdings Limited | Plymouth | 2025 |
| Bakari Limited | Dundee | 2021 |
| Bakayle (Holdings) Limited | Sheffield | 2022 |
| Bake Holding Ltd | Glasgow | 2023 |
| Bakeline Limited | London | 2020 |
| Bakelite UK Holding Ltd. | Penarth | 2020 |
| Bakelite UK Intermediate Ltd. | Penarth | 2020 |
| Bakelite UK Topco Ltd. | Penarth | 2020 |
| Baker & Baker Group Limited | Bromborough | 2013 |
| Baker & Co. Holdings Limited | Redditch | 2018 |
| Baker & Coleman Holdings Ltd | Blackburn | 2023 |
| Baker & Taylor UK Investments Limited | Ipswich | 2007 |
| Baker (SCG) Mortgages Ltd | Tamworth | 2020 |
| Baker Bespoke (Shropshire) Ltd | Ludlow | 2026 |
| Baker Boys Holdings Limited | Beeston | 2023 |
| Baker Bros Property Ltd | Cardiff | 2024 |
| Baker Capital Holdings Limited | Watford | 2019 |
| Baker Cole Ltd | Exeter | 2024 |
| Baker Davies Ltd | Poole | 1997 |
| Baker Estate Holdings Ltd | Stourbridge | 2023 |
| Baker Family Capital Limited | Swindon | 2026 |
| Baker Family Holdings Limited | Stowmarket | 2016 |
| Baker Financial Planning Ltd | Manchester | 2006 |
| Baker Gladstone and York Limited | | 1999 |
| Baker Goodchild (Holdings) Limited | Birmingham | 2019 |
| Baker Heritage Holdings Limited | Great Yarmouth | 2026 |
| Baker Holdings (SW) Limited | Newton Abbot | 2015 |
| Baker Holdings NE Limited | Bishop Auckland | 2025 |
| Baker Hudson (Health) Ltd | Stroud | 2015 |
| Baker Hughes EUR Finance Limited | London | 2025 |
| Baker Hughes Industrial (UK) Holdings | London | 2006 |
| Baker Hughes International Treasury Services Limited | London | 1995 |
| Baker Hughes UK Funding Company Ltd | London | 2020 |
| Baker Hughes UK Pension Trustees Limited | Aberdeen | 1980 |
| Baker Hughes UK Treasury Services Limited | London | 2011 |
| Baker Jayne Insurance Brokers Ltd | Leicester | 2009 |
| Baker Jones Holdings Ltd | Aldermaston | 2019 |
| Baker Leasing Limited | Amersham | 2001 |
| Baker Legacy Limited | Oldham | 2019 |
| Baker Love Jones Ltd | Bournemouth | 2026 |
| Baker Mortgages Ltd | Clifton, Shefford | 2026 |
| Baker Oldfield Limited | Aldershot | 2009 |
| Baker Perkins Holdings Limited | Peterborough | 2015 |
| Baker Perry Limited | Southampton | 2026 |
| Baker Preschool Holdings Limited | Bristol | 2021 |
| Baker Property Group Limited | Billinghurst | 2020 |