| Barnabas Nominees Limited | Oxford | 2012 |
| Barnaby & Jones Ltd | Newton Abbot | 2020 |
| Barnaby-Jesse Stephen Pearce Ltd | Cirencester | 2024 |
| Barnard Builders Ltd | Stroud | 2008 |
| Barnard Payne Consulting Limited | Birmingham | 2008 |
| Barnards Contracts Limited | Brentford | 1997 |
| Barnaville Plastering Limited | Northampton | 2014 |
| Barndale Limited | | 1999 |
| Barnes Carpets Limited | Bishop'S Stortford | 2011 |
| Barnes Clark Limited | Maldon | 2024 |
| Barnes Henderson Limited | Cambridge Road | 1992 |
| Barnes Holland Publishing Limited | Princes Risborough | 2009 |
| Barnes Plant Limited | Ipswich | 1983 |
| Barnes Yard Management Company Limited | Swindon | 2012 |
| Barnet Woodhouse Limited | Letchworth Garden City | 2020 |
| Barnethill Limited | Dundee | 2011 |
| Barnett Group Limited | Beckenham | 2016 |
| Barnett Ltd | Southampton | 2015 |
| Barnett Safety Services Ltd | Weymouth | 2012 |
| Barnett Waddingham Trustees (1980) Limited | Amersham | 1980 |
| Barnett, Lawson (Trimmings) Limited | Bedford | 1988 |
| Barnetts Court Estates Limited | Belfast | 1998 |
| Barney Precast Limited | Derby | 1989 |
| Barney Walker Limited | Bath | 2001 |
| Barneys Brawlers Ltd | London | 2025 |
| Barnfather Ltd | Dudley | 2023 |
| Barnfield Centric Limited | Nelson | 2009 |
| Barnfield Developments Limited | Nelson | 2004 |
| Barnfield Land Ltd | Lancashire, Nelson | 2020 |
| Barnfield Manor Apartments Management Co Ltd | Ballyclare | 2009 |
| Barnford Crescent 1961 Limited | Oldbury | 2014 |
| Barnford Estates Ltd | Salford | 2012 |
| Barngates Brewery Limited | Penrith | 1999 |
| Barningham Creative Electronics Ltd | Colchester | 2012 |
| Barnington Harper Limited | York | 2021 |
| Barnmead Road Management Company Limited | Kent | 1999 |
| Barno (China) Co., Limited | Beckenham | 2025 |
| Barnsdale Properties Ltd | Lancashire | 2000 |
| Barnsley 1970 Limited | Barnsley | 2013 |
| Barnsley Assets (NO 2) Limited | Manchester | 2016 |
| Barnsley Assets Limited | Manchester | 2016 |
| Barnsley Auto Centre Limited | Barnsley | 2025 |
| Barnsley Bedales Nominee Company Limited | Petersfield | 2016 |
| Barnsley ERP Ltd | Barnsley | 2026 |
| Barnsley Estates Ltd | Salford | 2025 |
| Barnsley Maintenance Ltd | Barnsley | 2022 |
| Barnsley Roofing Supplies Limited | Ossett | 2024 |
| Barnsley Waste Removals Limited | Barnsley | 2021 |
| Barnstaple Motors Limited | Wellington | 2015 |
| Barnstaple Riverside Developments Limited | London | 2025 |
| Barnstaple Riverside Investments Limited | London | 2025 |
| Barnstaple Riverside Limited | London | 2025 |
| Barnstaple Van and Car Hire Limited | Stevenage | 2015 |
| Barnstaple Van Hire Limited | Stevenage | 2015 |
| BARNUS06 Ltd | Daventry | 2018 |
| Barnvakten I Boras Holding Limited | London | 2024 |
| Barod Broadcast CYF. | Cardiff | 2023 |
| Baron Enterprises Limited | Enniskillen | 2007 |
| Baron Truck Tyres Limited | York | 2009 |
| Baron's Contract Furniture Limited | Leyland | 2012 |
| Baronlea Limited | Bridgend | 2026 |
| Baronoak Limited | Bridgend | 2026 |
| Barons Asset Management Limited | London | 2005 |
| Barons Corporate Finance Limited | London | 2007 |
| Barons Financial Services Limited | London | 2011 |
| Barons International Limited | London | 2005 |
| Barons Value Relations Limited | London | 2000 |
| Barony Good Product Co., Ltd | Kington | 2023 |
| Barony Hotels Worldwide Limited | Kington | 2002 |
| Baroque House Limited | Harrogate | 2017 |
| Baros Abyss Ltd | Colchester | 2025 |
| Barr Subco 2 Limited | Bellshill | 2014 |
| Barrabrith Limited | Hyde | 2024 |
| Barrack Street Property Management Ltd | Ballyclare | 2007 |
| Barracuda Business Park Management Company Ltd | Ormskirk | 2021 |
| Barracuda London Limited | Hoddesdon | 2015 |
| Barracuda Property Company Limited | West Looe | 1996 |
| Barrala Limited | Aylesbury | 2019 |
| Barraston Developments Limited | Renfrew | 1988 |
| Barratt & Robinson (1877) Limited | Weybridge | 1986 |
| Barratt Dormant (Tyers Bros. Oakham) Limited | Coalville | 1970 |
| Barratt Dormant (WB Construction) Limited | Coalville | 1982 |
| Barratt Dormant (WB Properties Developments) Limited | Coalville | 1979 |
| Barratt Dormant (WB Properties Northern) Limited | Coalville | 1985 |
| Barratt Energy Solutions Ltd | Wilmslow | 2016 |
| Barratt House Nominee 1 Limited | London | 2015 |
| Barratt House Nominee 2 Limited | London | 2015 |
| Barre Stamina Fitness Ltd | London | 2019 |
| Barres Ltd | Inverness | 2011 |
| Barreto & Associates Limited | London | 2021 |
| Barrett Developments & Lettings Limited | York | 2014 |
| Barrett Engineering Steel Ireland Limited | Dudley Hill | 2000 |
| Barrett Engineering Steel North Limited | Dudley Hill | 1995 |
| Barrett Engineering Steel Willenhall Limited | Bradford | 1995 |
| Barrett Granger Limited | Cardiff | 2021 |
| Barrett National Steel Services Limited | Dudley Hill | 2003 |
| Barrett Steel (Scotland) North Limited | Newbridge | 2003 |
| Barrett Steel Energy Products LOW Alloys Limited | Bradford | 1995 |
| Barrett Steel Properties Limited | Dudley Hill | 1992 |
| Barrett Steel Shoreham Limited | Bradford | 2006 |