| Barkston Limited | Leeds | 2020 |
| Barkstoncap Advisory Ltd. | London | 2016 |
| Barkway House Estates Limited | Cambridge | 2021 |
| Barkwell Plumbing and Heating Holdings Limited | Okehampton | 2025 |
| Barkworth Actuarial Limited | Blackpool | 2018 |
| Barl Holdings Limited | Eastbourne | 2025 |
| Barlavington Estates (NO 1) Limited | London | 2007 |
| Barlby Ltd | Gerrards Cross | 2018 |
| Barle Holdings Limited | London | 2020 |
| Barle Impact Limited | Chichester | 2026 |
| Barley AVE Holdings Ltd | Pocklington | 2024 |
| Barley Care Group Ltd | Birmingham | 2025 |
| Barley Conker Holdings Ltd | Witney | 2024 |
| Barley General Partner Limited | London | 2022 |
| Barley GP | London | 2023 |
| Barley Hill NO.2 Holdings Limited | London | 2021 |
| Barley Hill NO.2 PLC | London | 2021 |
| Barley Holdco | London | 2022 |
| Barley Midco Limited | London | 2023 |
| Barley Park Holdings Ltd | Peterborough | 2009 |
| Barley Properties Holdings Limited | Loughton | 2017 |
| Barleybeat Group Ltd | Stone | 2025 |
| Barleymow Investments Limited | Winchester | 2025 |
| Barleythorpe Investments Limited | Lincoln | 2018 |
| Barlika Group Ltd | London | 2024 |
| Barlings Holdings Ltd | Skegness | 2018 |
| Barlow Dodd Financial Consultants Ltd | Southport | 2010 |
| Barlow Financial Limited | Wootton Bridge | 2006 |
| Barlow Holdings Ltd | Bolton | 2023 |
| Barlow Irvin Financial Services Ltd | Manchester | 2018 |
| Barlow ST Holdings Limited | Manchester | 2025 |
| Barlow Ventures Limited | | 1990 |
| Barlowe Mill Holdings Limited | Stockport | 2020 |
| Barlowfold Investments Holdings Ltd | Blackburn | 2019 |
| Barlowood Holdings Ltd | London | 2023 |
| Barloworld Mongolia Limited | Maidenhead | 2019 |
| Barloworld UK Nominees Limited | Maidenhead | 1974 |
| Barlows Childcare Properties Holdings Limited | Manchester | 2019 |
| Barmar Finance Limited | London | 2015 |
| Barmar Holdings Limited | London | 2021 |
| Barmar Servicing Limited | London | 2015 |
| Barmax Limited | Irthlingborough | 2020 |
| Barmil Holdings Limited | London | 2023 |
| Barmoor Holdings Limited | Berwick-Upon-Tweed | 2023 |
| Barmor Holdings Limited | Bromyard | 2020 |
| Barmouth Capital Ltd | London | 2023 |
| Barn 2011 (Property) Limited | Abingdon | 2011 |
| Barn Estate Ltd | Radlett | 2024 |
| Barn Farm Cottage Limited | Weston By Welland | 2009 |
| Barna Partners Ltd | Richmond Upon Thames | 2023 |
| Barnabas Group Holdings Ltd | London | 2026 |
| Barnaby Group Holdings Ltd | Maghull | 2026 |
| Barnaby Stackhouse Ltd | Shepshed | 2011 |
| Barnack Estates Holdings Limited | Peterborough | 2020 |
| Barnacle Capital Ltd | Cambridge | 2022 |
| Barnacle Home Finance Limited | Hinckley | 2009 |
| Barnard Consultants Ltd | Southampton | 2004 |
| Barnard Management Limited | Thatcham | 2011 |
| Barnardo Staff Pension Scheme Trustees Limited | London | 2024 |
| Barnards Capital Limited | Brentford | 2024 |
| Barnards Investments Limited | Dunmow | 2017 |
| Barnbarn Limited | Ballymena | 2025 |
| Barnco Limited | Midlothian | 1956 |
| Barncrest NO. 141 Limited | Gillingham | 2002 |
| Barnden Financial Services Ltd | Portsmouth | 2010 |
| Barnellan Equity Advice Ltd. | Glasgow | 2002 |
| Barnells Mortgage Consultants Limited | Preston | 2006 |
| Barnend Limited | Nr Romsey | 2022 |
| Barnes & Nobles International Ltd. | Wakefield | 2018 |
| Barnes & Sherwood Corporate Pension Services Ltd | London | 2026 |
| Barnes & Sherwood Limited | Farnborough | 1996 |
| Barnes & Sherwood Private Client Services Ltd | London | 2026 |
| Barnes & Sherwood Professional Advisers Ltd | London | 2010 |
| Barnes Bros. Holdings Ltd | Sittingbourne | 2023 |
| Barnes Business Finance Ltd | Horsham | 2025 |
| Barnes Commercial Finance Limited | Deeside | 2024 |
| Barnes Commercial Limited | London | 2019 |
| Barnes Corner Investments Limited | London | 2019 |
| Barnes Day Care Holding Limited | London | 2022 |
| Barnes Derivatives Limited | London | 1998 |
| Barnes Family Management Ltd | Basingstoke | 2020 |
| Barnes Financial Holdings Limited | Peterborough | 2025 |
| Barnes Financial Limited | Bexleyheath | 2018 |
| Barnes Holding Group Limited | Plymouth | 2024 |
| Barnes Independent Services Limited | Doncaster | 2017 |
| Barnes Ingram Limited | Bournemouth | 2012 |
| Barnes JB Limited | Bootle | 2025 |
| Barnes Kingsnorth Estate Agents Limited | Tonbridge | 2010 |
| Barnes Lawrence Limited | Northampton | 2021 |
| Barnes Lincoln Investments Limited | Coventry | 2021 |
| Barnes London Holdings Limited | Loughton | 2024 |
| Barnes Mortgage Solutions Ltd | Carlton | 2021 |
| Barnes Robertson Limited | Eastcote | 2016 |
| Barnes Rural Finance Ltd | Norwich | 2025 |
| Barnes-Ward Limited | Weymouth | 2001 |
| Barnesfield Investments Ltd | Bolton | 2026 |
| Barnet Financial Limited | London | 1999 |
| Barnet Pepper Holdings Limited | Caernarfon | 2023 |
| Barnett & Merriman Limited | High Wycombe | 2020 |
| Barnett & Partners Limited | Kenilworth | 1999 |