| Barnett Family Holdings Limited | London | 2020 |
| Barnett Group Enterprises Limited | Brighton | 2023 |
| Barnett Holding Group Ltd | Wolverhampton | 2025 |
| Barnett Jones & Cooke Limited | Cheshire | 1999 |
| Barnett Mortgage Solutions Limited | Burton On Trent | 2019 |
| Barnett Ravenscroft Financial Services Limited | West Midlands | 2000 |
| Barnett Ravenscroft Holdings Limited | Birmingham | 2024 |
| Barnett Security Holdings Limited | Preston | 2025 |
| Barnett Waddingham Actuaries and Consultants Limited | London | 2008 |
| Barnett Waddingham Capital Trustees Limited | Amersham | 1992 |
| Barnett Waddingham Trustees (1984) Limited | Amersham | 1984 |
| Barnett Waddingham Trustees (1992) Limited | Amersham | 1992 |
| Barnett Waddingham Trustees (1996) Limited | Amersham | 1995 |
| Barnett Waddingham Trustees (1997) Limited | Amersham | 1997 |
| Barnett Waddingham Trustees Limited | Amersham | 1986 |
| Barnett Waddingham Trustees Scotland Limited | Amersham | 1979 |
| Barnett-Brothers Ltd | Crawley | 2020 |
| Barnetts Finance Limited | Dundee | 2023 |
| Barney Howard & Co Limited | Ramsgate | 2023 |
| Barnfather Properties Ltd | Darlaston | 2022 |
| Barnfield (EOT) Limited | Nelson | 2024 |
| Barnfield PLF Limited | Blackpool | 2020 |
| Barnfields Paraplanning Limited | Gloucester | 2025 |
| Barnham Broom NC Limited | Norwich | 2024 |
| Barnham Business Solutions Ltd | Chichester | 2014 |
| Barnhill Holdings Limited | Dundee | 2024 |
| Barnhouse Limited | Sidcup | 2023 |
| Barnox Ltd | Faringdon | 2015 |
| Barns and Farms Limited | Uxbridge | 2025 |
| Barns Holdings Ltd | London | 2024 |
| Barnsbury Holdings Ltd | London | 2021 |
| Barnsbury Road Finance Ltd. | London | 2016 |
| Barnsbury Snowdon Limited | London. | 2026 |
| Barnsdale Solar Holdco Limited | London | 2026 |
| Barnsley Bate Holdings Limited | Mansfield | 2024 |
| Barnsley Brickwork Holdings Limited | Barnsley | 2021 |
| Barnsley Card Ltd | Barnsley | 2016 |
| Barnsley Mortgages Ltd | Barnsley | 2024 |
| Barnsley Timber Merchants (Holdings) Limited | Barnsley | 2017 |
| Barnston Advisors Group Ltd | London | 2024 |
| Barnston Capital Limited | Coventry | 2016 |
| Barnston Finance Limited | Wirral | 2014 |
| Barnston Global Ltd | Bourne End | 2025 |
| Barnston Holdings Limited | Dunmow | 1980 |
| Barnton Capital Holdings Limited | 139 Fountainbridge | 2022 |
| Barnton Ltd | Edinburgh | 2025 |
| Barnwood House Ltd | Gloucestershire, Gloucester | 2018 |
| Barnwood Properties Limited | Birmingham | 1958 |
| Baro Capital Limited | Polegate | 2023 |
| Barolo Bidco Limited | London | 2022 |
| Barolo Finco Limited | London | 2022 |
| Barolo Midco Limited | London | 2022 |
| Barometer Group Limited | Alton | 2018 |
| Barometer Investments Limited | Alton | 2014 |
| Baron & Grant Investment Management Limited | London | 2019 |
| Baron Baron Ltd | London | 2025 |
| Baron Capital Management UK Limited | London | 2019 |
| Baron Finances Credit & Venture Limited | London | 2019 |
| Baron Holdco Limited | Rushden | 2020 |
| Baron Kelso Corporate Trustee Ltd | Widnes | 2022 |
| Baron Point Financial Ltd. | London | 2015 |
| Baron Safety Limited | Rushden | 2020 |
| Baron Securities Ltd | London | 2025 |
| Baronat Investment Company Limited | Bootle | 2022 |
| Barone Group Ltd | London | 2026 |
| Baronial Business Bureau Ltd | Kington | 2025 |
| Baronial Holdings Limited | Glasgow | 2019 |
| Barons (UK) Limited | Wimbledon Village | 1984 |
| Barons Capital Partners Limited | Wimbledon Village | 1988 |
| Barons Holdings Limited | London | 2023 |
| Barons Investments Limited | London | 2023 |
| Barons Property Centre Group Limited | Bristol | 2016 |
| Baronscourt Europe Limited | Derry | 2021 |
| Baronsmead Second Venture Trust PLC | London | 2000 |
| Baronsmead Venture Trust PLC | London | 1998 |
| Barosell Limited | Bury St. Edmunds | 2018 |
| Barossa Advisory Limited | London | 2025 |
| Baroste Limited | London | 2019 |
| Barouki Holding Limited | Teddington | 2024 |
| Barova Property Ltd | Wakefield | 2022 |
| Barplan Limited | West Yorkshire | 2001 |
| Barq UK Fintech Limited | Romford | 2026 |
| Barr & Cott Holdings Ltd | Wigan | 2023 |
| Barr Beacon Consulting Ltd | London | 2018 |
| Barr Davis & Company Limited | Thornton Cleveleys | 1982 |
| Barra Capital Ltd | London | 2020 |
| Barra Holdings Ltd | London | 2025 |
| Barraclough Holdings Ltd | Bury | 2026 |
| Barracloughs Holdings Limited | Hailsham | 2016 |
| Barracuda Capital Limited | Henley-On-Thames | 2026 |
| Barracuda Holdings Limited | Nr Frome | 1997 |
| Barracudas Holdings Limited | Huntingdon | 2018 |
| Barrak Ltd | Corsham | 2023 |
| Barral Sheppard Wealth Ltd | Paisley | 2020 |
| Barras Capital Management PLC | Chelmsford | 2021 |
| Barratt & Canniford Holdings Ltd | Taunton | 2023 |
| Barratt & Cooke Limited | Bury St. Edmunds | 2005 |
| Barratt Asset Management UK Ltd | Maidstone | 2012 |
| Barratt Energy Group Limited | Wilmslow | 2011 |
| Barratt Energy Holding Limited | Wilmslow | 2013 |