| Barakah Investment Holdings Limited | Slough | 2025 |
| Barakah Khair Holdings Ltd | Chatham | 2025 |
| Barakah Partners Co Ltd | Nottingham | 2015 |
| Barakel Holdings Ltd | Leicester | 2018 |
| Barakzai Holdings Limited | Manchester | 2023 |
| Barall Holdings Limited | Malton | 2018 |
| Baram JTC Limited | Southampton | 2017 |
| Baran Holdings Limited | Enfield | 2026 |
| Barani Exchange Ltd | London | 2025 |
| Baraq Holdings Ltd | Birmingham | 2024 |
| Baraz Financial Services Limited | Kettering | 2014 |
| Barb & DOR Brokers Ltd | Orpington | 2020 |
| Barb Holdings Limited | Antrim | 2025 |
| Barbados Enterprises PLC | London | 2015 |
| Barbakan Holdings Limited | Manchester | 2021 |
| Barbarella Property Investments Limited | Maidenhead | 2003 |
| Barbarosa Limited | Long Bennington | 1999 |
| Barbax Investments Limited | Waterlooville | 2016 |
| Barber Asset Holdings Ltd | Ringwood | 2024 |
| Barber Family Holdings Limited | Preston | 2023 |
| Barber Gelb Limited | London | 2017 |
| Barber Harrison & Platt Capital Holdings Limited | Sheffield | 2025 |
| Barber Holdco Limited | Rothley | 2024 |
| Barber Investments Limited | Woking | 2022 |
| Barber V Holdings Ltd | Northampton | 2026 |
| Barberd Limited | Brighton | 2024 |
| Barberry Holdings Limited | Stourbridge | 2021 |
| Barbican Capital Holdings Limited | London | 2026 |
| Barbican Construction Holdings Limited | Leeds | 2024 |
| Barbican Corporate Finance Limited | Battle | 2004 |
| Barbican Design Limited | London | 2024 |
| Barbican Independent Financial Advisors Limited | Hertford | 1987 |
| Barbican ISA Limited | Cardiff | 2018 |
| Barbican Logistics Investments Limited | Salford | 2018 |
| Barbican Orthodontist Limited | Edgware | 2026 |
| Barbon Advisors Operations Limited | Maidenhead | 2021 |
| Barbon Holdings 2030 Limited | Lincoln | 2010 |
| Barbon Insurance Group Limited | Lincoln | 1995 |
| Barborwicz Limited | London | 2026 |
| Barbould Holdco Limited | London | 2026 |
| Barbour & Co Property Limited | Bolton | 2025 |
| Barbour ABI Limited | London | 2021 |
| Barbridge Investments Limited | London | 2013 |
| Barbrook Management Company Ltd | Swindon | 2012 |
| Barbuss (UK) Limited | Warwick | 2020 |
| Barc Design and Build Limited | Exeter | 2020 |
| Barc Holdings Ltd | Leicester | 2025 |
| Barcares Investments Limited | Leeds | 2023 |
| Barcelo Asset Holdings Limited | Market Harborough | 2018 |
| Barcelona | Horsforth | 2024 |
| Barcelona Funeral UK Ltd | Dagenham | 2023 |
| Barchester Finco 2017 UK Limited | London | 2017 |
| Barchester Finco 2019 (Properties) Limited | London | 2019 |
| Barchester Finco 2019 Limited | London | 2019 |
| Barchester Group Limited | | 1997 |
| Barchester Hellens Limited | London | 2019 |
| Barchester Holdco IVY Limited | London | 2025 |
| Barchester JAC Ltd | Broadway | 2023 |
| Barchester Propco (Maidstone Two) Limited | London | 2020 |
| Barchester Propco Two Hellens Limited | London | 2023 |
| Barclay Leasing Limited | London | 1989 |
| Barclay Simpson Europe Limited | London | 2019 |
| Barclaycard Payments Limited | London | 2025 |
| Barclays Aldersgate Investments Limited | | 1988 |
| Barclays Asset Management Limited | London | 2009 |
| Barclays Bank PLC | | 1971 |
| Barclays Bank UK PLC | London | 2015 |
| Barclays Capital Asia Holdings Limited | | 2005 |
| Barclays Capital Securities Limited | | 1985 |
| Barclays Converted Investments (NO.2) Limited | | 2005 |
| Barclays Equity Holdings Limited | | 1990 |
| Barclays Finance Limited | London | 2025 |
| Barclays Funds Investments Limited | | 2000 |
| Barclays Gaia Holdings Limited | London | 2025 |
| Barclays Industrial Development Limited | | 1979 |
| Barclays Industrial Investments Limited | | 1979 |
| Barclays Insurance Services Company Limited | | 1970 |
| Barclays International Holdings Limited | | 1998 |
| Barclays Investment Management Limited | | 1986 |
| Barclays Investment Solutions Limited | | 1992 |
| Barclays Leasing (NO.9) Limited | London | 1986 |
| Barclays Long Island Limited | London | 2008 |
| Barclays Ocio Services Limited | London | 2022 |
| Barclays PLC | London | 1896 |
| Barclays Principal Investments Limited | London | 2012 |
| Barclays Security Trustee Limited | London | 2017 |
| Barclays UK Investments Limited | | 2003 |
| Barclays Unquoted Investments Limited | | 1987 |
| Barco Investments Limited | Bedford | 2013 |
| Barcode Logistics Group Ltd | Oswaldtwistle | 2013 |
| Barcon Holdings Limited | Preston | 2024 |
| Barconn Group Limited | Norwich | 2004 |
| Barconn Holdings Limited | Norwich | 2019 |
| Barcore Holdings Ltd | Cranfield | 2024 |
| Barcroft Mortgage, Finance and Insurance Services Ltd. | Oldham | 1990 |
| Bard Midco 2 Limited | London | 2025 |
| Bard Midco Limited | London | 2020 |
| Bard Property Bidco Ltd | Hemel Hempstead | 2023 |
| Bard Property Midco Ltd | Hemel Hempstead | 2023 |
| Bardale Holdings Ltd | Glasgow | 2021 |