| Blair Packaging Limited | Liverpool | 1981 |
| Blaire C. Fraser Limited | Huntingdon | 2017 |
| Blairgowrie Fruit Packers Limited | Perthsire | 2001 |
| Blairmhor Distillers Limited | Airdrie | 1992 |
| Blairmhor Limited | Airdrie | 1986 |
| Blairs Aluminium Systems Ltd. | Glasgow | 2015 |
| Blairs Catering Equipment Limited | Irvine | 2013 |
| Blairs Windows Ltd. | Greenock | 2011 |
| Blair’S Repairs Ltd | Bathgate | 2026 |
| Blakamix Int'L Ltd | Bedford | 1996 |
| Blake & Bull Ltd | Maidenhead | 2017 |
| Blake and Boughton Limited | Thetford | 2001 |
| Blake and Sons Limited | Chesterfield | 2018 |
| Blake Bijoux Ltd | Witney | 2024 |
| Blake Construction Materials Limited | Doncaster | 2020 |
| Blake Electro-Production Limited | Fareham | 1981 |
| Blake Engineering Company Limited | Milnsbridge | 2001 |
| Blake Evans Upholstery Ltd | Brierley Hill | 2026 |
| Blake FAB Engineering Ltd | Colchester | 2012 |
| Blake Joinery Company Limited | Bristol | 1989 |
| Blake Love Star Ltd | London | 2021 |
| Blake Nash Visuals Ltd | Ryde | 2018 |
| Blake Printers Limited | Haltwhistle | 2002 |
| Blake U.K. Limited | | 1971 |
| Blakeacre Limited | Sutton Coldfield | 1986 |
| Blakeney Lifting Solutions Ltd | Newnham | 2018 |
| Blakeney Marine Services Limited | Fakenham | 2011 |
| Blakeney Motorsport Limited | Dartford | 2005 |
| Blakepoint Limited | West Yorkshire | 2002 |
| Blakes Bakery Limited | Cornwall | 2010 |
| Blakes Bakes Ltd | Orpington | 2025 |
| Blakes Building Profiles Limited | Newbury | 1988 |
| Blakes Gold and Silver Ltd | Gloucester | 2023 |
| Blakes Luxury Furniture Limited | Ascot | 2018 |
| Blakes of Winchester Limited | Chandler'S Ford | 2021 |
| Blakes On-Site Services Limited | Holyhead | 2012 |
| Blakes Sheds & Fencing Limited | West Midlands | 2001 |
| Blakes Works Limited | Bournemouth | 2025 |
| Blakewedge Limited | Clitheroe | 1981 |
| Blakewell Services Limited | South Molton | 2010 |
| Blakey Prints Limited | Gloucester | 2025 |
| Blakeys Ltd | Canvey Island | 2022 |
| Blakhol Perfumes and Cosmetics Ltd | London | 2026 |
| Blakley Electrics Limited | Crayford | 1957 |
| Blakmarlin Ltd | Stourport-On-Severn | 2022 |
| Blaknblu Limited | Cambridge | 2003 |
| Blam Furniture Makers Limited | Thame | 2012 |
| Blameless TM ATC Limited | Warrington | 2025 |
| Blamer Pharma Co., Ltd | Beckenham | 2020 |
| Blamire Printers Limited | Ferryhill | 1986 |
| Blana Floor Sanding Ltd | Feltham | 2024 |
| Blanc Aero Industries UK Limited | Rugby | 1979 |
| Blanc DE Bierges (Europe) Limited | Northampton | 2018 |
| Blanc Interior Design Ltd | Newport | 2021 |
| Blanc River Ltd | Enfield | 2026 |
| Blanc Studio Packaging Ltd | Manchester | 2025 |
| Blanchard Engineering Limited | Rotherham | 2017 |
| Blanchard Fabricators Limited | Rotherham | 2026 |
| Blanche Oral Aesthetics Ltd | London | 2025 |
| Blanchon UK Limited | Charing | 2011 |
| Blanco Bags Limited | Didcot | 2021 |
| Blanconeroo Ltd | London | 2026 |
| Bland Coffee Ltd | London | 2025 |
| Bland Design Ltd | Wisbech | 2019 |
| Bland Services Ltd | Doncaster | 2018 |
| Blandford Garden Machinery ( Dorset ) Ltd | Blandford Forum | 2015 |
| Blandford GAS Services Limited | Kettering | 2002 |
| Blandford Woodwind Limited | Blandford | 1998 |
| Blandon Power Limited | Nailsworth | 2017 |
| Blaney Gears Ltd | Ballymena | 2011 |
| Blangsted Limited | London | 2017 |
| Blank Art Limited | Manchester | 2023 |
| Blank Canvas Fashion Limited | Wembley | 2024 |
| Blank Canvas Vehicle Graphics Ltd | Sittingbourne | 2013 |
| Blank Goods Ltd | Northampton | 2021 |
| Blank Number Plates Limited | Shotton | 2025 |
| Blank Prototypes Ltd | London | 2025 |
| Blank Record Limited | Sheffield | 2017 |
| Blank Street UK Limited | London | 2022 |
| Blanka’S Ltd | Liverpool | 2024 |
| Blankenstein Welding Ltd | Kirkcaldy | 2018 |
| Blankets and More Ltd | Sutton | 2019 |
| Blankita West Green Ltd | London | 2026 |
| Blankmaster Ltd | Wisbech | 2016 |
| Blanks & Bangs Limited | Cockfosters | 2024 |
| Blanks 3D Ltd | Sheffield | 2024 |
| Blanna Organics Ltd | Prescot | 2020 |
| Blanq Media Ltd | London | 2024 |
| Blanq Studios Ltd | London | 2026 |
| Blanque Canvas Ltd | Leicester | 2023 |
| Blanson Limited | Leicester | 2005 |
| Blantyre Electrical Ltd | East Kilbride | 2022 |
| Blantyre Fabrications Limited | Glasgow | 2021 |
| Blaque Falcon Corporation Ltd | London | 2022 |
| Blas AR Fwyd CYF | | 2003 |
| Blast 'N' Prep Ltd | Warwick | 2018 |
| Blast Clean and Coatings Limited | Cornwall | 2003 |
| Blast Cleaning UK Ltd | Lincoln | 2021 |
| Blast Cult Limited | London | 2025 |
| Blast Drinks Ltd | Oldham | 2023 |