| Barretts Industries Ltd | St. Albans | 2007 |
| Barretts of Aspley Limited | Bedford | 1991 |
| Barretts Sausage Ltd | Birmingham | 2014 |
| Barrex Ltd | Sheffield | 2018 |
| Barrhead KID Co Limited | Glasgow | 2009 |
| Barrhead Leather Ltd | Glasgow | 2015 |
| Barrhead Sanitary Ware Limited | Glasgow | 1992 |
| Barrhead Timber Recycling Ltd | Glasgow | 2023 |
| Barric Holdings Limited | Diss | 2025 |
| Barric Limited | Diss | 2001 |
| Barricade Ltd | Wigan | 2009 |
| Barrick Mouldings Limited | Mansfield Woodhouse | 1984 |
| Barrico Ltd | Bath | 2025 |
| Barrie Jones (Upholsterers) Limited | Manchester | 1978 |
| Barrie Knitwear Limited | Croydon | 1994 |
| Barrie William Halbert Ltd | Poole | 2016 |
| Barrier (Offshore) Engineering Limited | Newcastle Upon Tyne | 1982 |
| Barrier Base Ltd | Birmingham | 2025 |
| Barrier Biotech Limited | Attleborough | 1990 |
| Barrier Energy Limited | Wallsend | 2026 |
| Barrier Fabrication Limited | Wallsend | 2023 |
| Barrier Holdings Limited | Attleborough | 2000 |
| Barrier Medical Ltd | Pontypridd | 2024 |
| Barrier Steel Fabrications Limited | Kent | 1988 |
| Barries Ltd | Alresford | 2019 |
| Barriles Ahumadores Mediterraneo Ltd | London | 2024 |
| Barringer Mouldings Ltd | Stevenage | 2019 |
| Barrington Innovation Ltd | Bristol | 2015 |
| Barrington Metal Works Limited | Bedlington | 1992 |
| Barrington Print Ltd | Hereford | 2004 |
| Barringtons Foods Ltd | Huddersfield | 2022 |
| Barringtons of Sussex Ltd | Fareham | 2021 |
| Barriome Ltd. | London | 2026 |
| Barrmill Limited | Edinburgh | 2007 |
| Barrmuir Kitchen and Bathroom Scotland Ltd | Ayr | 2024 |
| Barrnon Ltd | Appleby-In-Westmorland | 2007 |
| Barron Brothers Limited | | 2006 |
| Barron Furniture Ltd | Cleckheaton | 2022 |
| Barron North Limited | Belfast | 2020 |
| Barrow & Gale Limited | Burnham | 1995 |
| Barrow Green Hydrogen Limited | London | 2021 |
| Barrow Hepburn & Gale Ltd | Burnham | 2015 |
| Barrow Hepburn Gale Limited | Burnham | 2021 |
| Barrow Hepburn Limited | Burnham | 2023 |
| Barrowcliffe Cooking Limited | Nottingham | 2018 |
| Barrowcliffe Food Solutions Limited | Nottingham | 2014 |
| Barrowcliffe Limited | Nottingham | 2003 |
| Barrowfield Thonging & Lacing Limited | Bishopton | 2013 |
| Barrows Bespoke Builds Ltd | Rugeley | 2024 |
| Barrows Cartons Limited | Mossley | 1977 |
| Barrpress Ltd | Liverpool | 2008 |
| Barrs Bay Ltd | Newtownards | 2021 |
| Barrs Court Engineering Limited | Hereford | 1983 |
| Barrs Security (Locksmiths) UK Limited | Hertfordshire | 2007 |
| Barrwood Joinery Ltd | Kilsyth | 2011 |
| Barry Advertiser Limited | Barry | 1927 |
| Barry and SON Limited | Salford | 1965 |
| Barry Callebaut (UK) Limited | Banbury | 1985 |
| Barry Callebaut Beverages UK Ltd | Chester | 1986 |
| Barry Callebaut Holding (UK) Limited | Banbury | 1990 |
| Barry Callebaut Manufacturing (UK) Limited | Oxfordshire | 1974 |
| Barry Colenso Master Chocolatier Ltd | Belper | 2007 |
| Barry Confections Ltd | Cardiff | 2018 |
| Barry Controls Limited | Reading | 1950 |
| Barry Godfrey Limited | Coulsdon | 2012 |
| Barry Healy Mechanical Ltd | Little Paxton, St Neots | 2017 |
| Barry Hews Automotive Services Limited | Barnstaple | 2005 |
| Barry Holdings Ltd | Sully | 2011 |
| Barry International Limited | London | 2016 |
| Barry Island Coffee Company Ltd | Barry | 2026 |
| Barry M. Cosmetics Ltd. | London | 1990 |
| Barry Mclean Stonemasonry Ltd | Stirling | 2025 |
| Barry Napper & Co Limited | Doncaster | 2015 |
| Barry Wright (U.K.) Limited | Reading | 1986 |
| Barry&Elaine Secure Limited | Glasgow | 2014 |
| Barry's Home Bakery Limited | Alnwick | 1964 |
| Barryaservice Limited | Cardiff | 2025 |
| Barrys Electrical Technical Services Ltd | Whitby | 2019 |
| Bars Unlimited Ltd | Northallerton | 2020 |
| Barso Environmental Limited | Mold | 2009 |
| Barson Precision Ltd | Bromsgrove | 2020 |
| Barspoon Drinks Ltd | London | 2023 |
| Barstows Ltd | Sleaford | 2026 |
| Bart Carpentry & Maintenance Ltd | Luton | 2025 |
| Bart Composite Builder Ltd | Hull | 2025 |
| Bart Endean Limited | Stannington | 2009 |
| Bart Spices Group Holdings Limited | Severn Beach | 2010 |
| Bart Upholstery Ltd | Hounslow | 2024 |
| Bart's Wheels Ltd | Chelmsford | 2014 |
| Bartco (UK) Limited | Norwich | 2013 |
| Bartcrown Limited | Dagenham | 2004 |
| Bartec (U.K.) Limited | Rochdale | 1983 |
| Bartec Engineering Services Limited | Stoke-On-Trent | 1993 |
| Bartec Municipal Technologies Holdings Limited | Barnsley | 2022 |
| Bartec Paper & Packaging Limited | Northwich | 1982 |
| Bartec Services Ltd | Banbury | 2025 |
| Bartech Control Systems Ltd | Colchester | 2023 |
| Bartech Propulsion Limited | Colchester | 2021 |
| Bartell Machinery Limited | Telford | 1998 |
| Bartenson Ltd | London | 2025 |