| Brewis Beer Co Ltd | Morpeth | 2018 |
| Brewis Engineering Limited | Somerset | 2003 |
| Brewjoy Distillers and Beverages Private Limited | London | 2025 |
| Brewlab Technical Services Limited | Sunderland | 2016 |
| Brewmac Ltd | Hereford | 2023 |
| Brewmaster's House Limited | Rushden | 2018 |
| Brewow Ltd | Wareham | 2024 |
| Brewpack Limited | Egham | 1995 |
| Brewquest Coffee Ltd | Kenilworth | 2025 |
| Brewshed Ltd | Bury St. Edmunds | 2016 |
| Brewsmith Beer Limited | Bury | 2014 |
| Brewstar Beverages Limited | | 2003 |
| Brewstar Systems Ltd | Aspley Guise | 2023 |
| Brewster Builder Ltd | Doncaster | 2020 |
| Brewster Mudie Limited | Shipston On Stour | 2004 |
| Brewster's Brewing Company Limited | Grantham | 1997 |
| Brewsters (Poole) Ltd | Poole | 2001 |
| Brewsters Smallholding Ltd | Dundee | 2021 |
| Brewtech Fabrications Ltd | Rochester | 2014 |
| Brewtein Ltd | London | 2024 |
| Brewtini Ltd | St. Albans | 2025 |
| Brexit Oils Limited | Newry | 2020 |
| Brexporters Limited | Newry | 2020 |
| Brey Engineering Ltd | Wellingborough | 2026 |
| Breydon Enterprises Limited | Great Yarmouth | 1992 |
| BRH Fabrication Limited | Honiton | 2024 |
| BRI Continental Limited | London | 2001 |
| Bri-Met Limited | Blackpool | 2007 |
| Bri-Stor Systems Limited | Stafford | 1982 |
| Bri-Tek Technologies Ltd | Bolton | 2010 |
| Brian 2 FAB Construction Ltd | Romford | 2022 |
| Brian Austin Consulting Limited | Dagenham | 2015 |
| Brian Capstick Welding Limited | Kendal | 2001 |
| Brian Coleman Enterprises Limited | Fakenham | 1994 |
| Brian Cottee Associates Limited | Barnet | 1980 |
| Brian Currie Printers Limited | Broxburn | 2009 |
| Brian Fairclough (Heating) Limited | Preston | 2003 |
| Brian Fell (Leven) Limited | Beverley | 1966 |
| Brian Ferrier (Holdings) Limited | Glasgow | 1981 |
| Brian Frankland Dispense Technician Limited | Morecambe | 2016 |
| Brian Fulton Limited | Workington | 2001 |
| Brian Hearty Associates Ltd | Rotherfield | 2016 |
| Brian Hobbs & Sons Limited | Taunton | 2015 |
| Brian Hunter Limited | Co Londonderry | 1981 |
| Brian James Trailers Limited | Rugby | 1999 |
| Brian Jones Carpentry Limited | Cardiff | 2026 |
| Brian Kirkby - PCS Ltd | London | 2021 |
| Brian Lane Joinery Limited | Hull | 2010 |
| Brian Lister (Light Engineering) Limited | Blackburn | 2013 |
| Brian Lowndes Print Limited | Walsall | 1967 |
| Brian Manktelow Limited | Bromley | 1981 |
| Brian Matchett & Sons Limited | | 2007 |
| Brian Mawson & SON Ltd | Barrow-In-Furness | 2015 |
| Brian Mccance (Steel) Limited | Belfast | 1976 |
| Brian Mcleod Electrical Services Limited | Inverurie | 2007 |
| Brian Mcphillips Limited | Edinburgh | 2015 |
| Brian Meek Technical Services Limited | Northampton | 2014 |
| Brian Metcalfe Welding Ltd | Windermere | 2026 |
| Brian Nixon Limited | Evesham | 2015 |
| Brian Page Printers Limited | Cranleigh | 1984 |
| Brian Pike Packaging Limited | Stockbridge | 2004 |
| Brian RAE Rail Services Limited | Lanark | 2018 |
| Brian Ramwell Classic Interiors Limited | Kendal | 2004 |
| Brian Reid and SON Limited | Lichfield | 2001 |
| Brian Scott Engineering Limited | | 2006 |
| Brian Seedle Helicopters Limited | Blackpool | 1997 |
| Brian Smyth Company Ltd | Holmfirth | 2015 |
| Brian Sutcliffe Packaging Limited | Bolton | 2000 |
| Brian Swindells Electrical Limited | Stockport | 2013 |
| Brian Tarver Electrical Services Limited | Pickering | 2011 |
| Brian Taylor Electrical Ltd | Merseyside, Liverpool | 2021 |
| Brian Totty Signs & Design Limited | Barnsley | 1981 |
| Brian Wells Limited | | 2009 |
| Brian Whincup & Sons Limited | York | 2003 |
| Brian Widdop Pallets Limited | West Yorkshire | 2007 |
| Brian Wogan Limited | Bristol | 1987 |
| Brian.Mcl Ltd | Glasgow | 2025 |
| Brianphoenixmartin Ltd | Cambridge | 2023 |
| Briar and Bard Drinks Company Limited | Rugby | 2025 |
| Briar Chemicals Limited | London | 2011 |
| Briard & Hutchings Electrical, Plumbing & Heating Solutions Ltd | Paignton | 2011 |
| Briardane Limited | Bolton | 1999 |
| Bribery Limited | Lincoln | 2012 |
| Bribex Limited | Yate | 1963 |
| Brical Finishers Limited | Exhall | 1995 |
| Bricam Ltd | Carrickfergus | 2021 |
| Brice Aggregates Limited | Witham | 2013 |
| Brice Gelato Ltd | London | 2025 |
| Bricesco Limited | Wednesbury | 2006 |
| Brick & Beam Properties Ltd | Egham | 2018 |
| Brick Bond (Northern) Limited | Ossett | 2012 |
| Brick Brace Limited | Northwood | 2012 |
| Brick by Brick Clothing Limited | Gerrards Cross | 2024 |
| Brick Collectable Limited | Romford | 2025 |
| Brick Consultants Ltd | Sowerby Bridge | 2010 |
| Brick Designs Ltd | Windsor | 2022 |
| Brick Enterprises Ltd | Norwich | 2018 |
| Brick Fabrication Limited | Pontypool | 1997 |
| Brick Frozen Ltd | Norwich | 2020 |
| Brick Gallery Limited | Twickenham | 2019 |