| Buckinghamshire County Council Schools | Aylesbury | A rating |
| Buckinghamshire County Council Services | Aylesbury | A rating |
| Buckinghamshire Healthcare NHS Trust | Aylesbury | A rating |
| Buckinghamshire New University | Buckinghamshire | A rating |
| Buckinghamshire, Oxfordshire, Berkshire West ICB | Oxford | A rating |
| Buckland Care Ltd | Poole | A rating |
| Buckland Post Office & Stores | Dover | A rating |
| BUCKLAND REST HOMES LTD T/A GREENBANKS CARE HOME | LIPHOOK, | A rating |
| Buckleigh of London | London | A rating |
| Buckles Solicitors LLP | Peterborough | A rating |
| Buckley & Son | HUDDERSFIELD | A rating |
| Buckley Express | Buckley | A rating |
| BUCKLEY GRAY YEOMAN | LONDON | A rating |
| Buckleys News Agent | Newferry | A rating |
| Buckman Laboratories Limited | Cheshire | A rating |
| Bucknall Dental | Stoke on Trent | A rating |
| Buckreddan Care Centre | Kilwinning | A rating |
| BUCKS & CO INT. LIMITED | Preston, Lancashire | A rating |
| BUCKS CAR HIRE LIMITED | MARLOW | A rating |
| Bucks Minibus Travel Ltd T/A Swan Rider | High Wycombe | A rating |
| Bucks Music Group | London | A rating |
| Bucks Pharmacies Limited T/A Cowley Pharmacy | High Wycombe | A rating |
| Bucks Polythene Ltd | Leicester | A rating |
| Bucks Trade Centre Ltd | High Wycombe | A rating |
| Bucksvill Traders Limited t/a Coco Masala | High Wycombe | A rating |
| Buckswood School | Near Hastings | A rating |
| BUCKTHORN PARTNERS LLP | London | A rating |
| Bucovina Cash & Carry Ltd | London | A rating |
| BUCUR BROTHERS CONSTRUCTION LTD | London | A rating |
| Bud Financial Limited | London | A rating |
| Bud Systems Ltd | Bristol | A rating |
| Budbrooke House Childrens Nursery (Warwick) LTD | Warwick | A rating |
| Budden Care Ltd T/A My Homecare Crowborough | Crowborough | A rating |
| Buddha Belly (Bow) Ltd T/A Regents Lake Banqueting Hall | London | A rating |
| Buddha Construction Ltd | Hayes | A rating |
| BUDDHA LOUNGE LONDON LTD | LONDON | A rating |
| Buddha Metta Society | Chorlton Cum Hardy | A rating |
| Buddhist Community Centre Letchworth | Arlesey | A rating |
| Buddhist Community Centre UK (BCCUK) | Aldershot | A rating |
| BUDDHIST GUMBA READING UK | WOKINGHAM | A rating |
| Buddi Limited | Rickmansworth | A rating |
| Budding Learners Ltd | London | A rating |
| BUDDY BEAR TRUST CONDUCTIVE EDUCATION SCHOOL | Dungannon | A rating |
| BUDENBERG GAUGE COMPANY LIMITED | ALTRINCHAM | A rating |
| Budget Buddy Ltd | Wigan | A rating |
| BUDGET CARS | High Wycombe | A rating |
| Budget Energy | Londonderry | A rating |
| Budget Express | Borehamwood | A rating |
| BUDGET HOMES LTD | london | A rating |
| BUDGET LINES WHOLESALE LTD | Manchester | A rating |
| Budget Transport Ltd | Hounslow | A rating |
| BUDGETBARGAINZ LIMITED | Moseley | A rating |
| Budgetbase Limited | Milton Keynes | A rating |
| Budgy Smuggler UK Ltd | London | A rating |
| BUDHILL CONVENIENCE STORE LIMITED | Glasgow | A rating |
| Budlite Security and Facility ManagementLimited | Belfast | A rating |
| Budri London Limited | London | A rating |
| Buds Limited T/A Catherine House Day Nursery Schools | Birmingham | A rating |
| Budweiser Budvar UK Ltd | Bristol | A rating |
| Buff Motion Ltd | Brighton | A rating |
| BUFFALO BISTRO LIMITED T/A BUFFALOES CAFE | Essex | A rating |
| Buffalo Trades LTd | Peterborough | A rating |
| Buffaload Logistics Limited | Huntingdon | A rating |
| Buffer London Limited | London | A rating |
| BUFFET RESTAURANT BURNLEY LTD | Burnley | A rating |
| Buffo Ltd | London | A rating |
| Bugbrooke Medical Practice | Bugbrooke | A rating |
| BUGGAZ LTD | Bolton | A rating |
| Buglife The Invertebrate Conservation Trust | Peterborough | A rating |
| BUGNI LABS LTD | London | A rating |
| BUGS Bioscience Ltd | London | A rating |
| Bugshan British Company Limited | London | A rating |
| Buhler UK Limited | London | A rating |
| BUI LTD | DERBY | A rating |
| Build 2 Design Limited | Keston | A rating |
| BUILD A HOME LTD | SOUTHALL | A rating |
| Build A Rocket Boy Limited | Leith | A rating |
| Build Generation Ltd. | London | A rating |
| Build Hollywood | London | A rating |
| Build My Care Limited | Reading | A rating |
| BUILD PLUS SURVEY LIMITED | Manchester | A rating |
| Build Solar Ltd | Penryn | A rating |
| Build Warranty Insurance Services Ltd | Gateshead | A rating |
| Build With Confidence Construction Ltd | London | A rating |
| Buildbuddy Construction Ltd | Hayes | A rating |
| BUILDCARE MAINTENANCE LTD | Oldham | A rating |
| Buildercast Limited | Scunthorpe | A rating |
| BUILDERS CLUB LONDON LIMITED | LONDON | A rating |
| BUILDERS EAST LONDON LTD | Ilford | A rating |
| BUILDERS MART LTD | Halesowen | A rating |
| BUILDERS TEAM LTD | Leeds | A rating |
| Builders Trade Center Ltd | Coventry | A rating |
| BUILDEX SUPPLIES LTD | Luton | A rating |
| Building & Construction City Limited | Bournemouth | A rating |
| Building Automation and control Ltd | Southall | A rating |
| BUILDING BETTER ENTERPRISE LTD | GILLINGHAM | A rating |
| BUILDING DESIGN (NORTHERN) LIMITED | Sunderland | A rating |
| Building Design Consultants | Billericay | A rating |
| Building Design Engineering Limited | Cheltenham | A rating |
| BUILDING DESIGN PARTNERSHIP LIMITED t/a BDP Ltd | London | A rating |
| Building Energy Experts Limited | Bristol | A rating |
| Building Engineering Services Association | London | A rating |
| BUILDING HOME SOLUTION LIMITED | MANCHESTER | A rating |
| Building Innovations (UK) Limited | Romford | A rating |
| Building lives (UK) Ltd | Birmingham | A rating |
| Building Management Solutions Integrators Ltd. | White Waltham | A rating |
| Building material Supplies LTD | Bolton | A rating |
| Building Performance Prediction Ltd T/A BPP Energy | Belfast | A rating |
| Building Plus Company London Ltd | Croydon | A rating |
| Building Research Establishment Ltd | Watford | A rating |
| Buildots UK Limited | Reading | A rating |
| BuildPartner Technology Ltd | London | A rating |
| Buildpro UK Ltd | London | A rating |
| BUILDREX LTD | London | A rating |
| BUILDSTOP LIMITED | Romford | A rating |
| BuildsWell Limited | Hayes | A rating |
| Buildt AI Limited t/a Cosine | London | A rating |
| Buildvantage Limited | Ilford, | A rating |
| Buildyard Wigston Limited | Leicester | A rating |
| Built Environment Support and Training Ltd | Glasgow | A rating |
| Built Fitout and Refurbishment Limited | London | A rating |
| Built Recruitment Limited | London | A rating |
| BUILTVISIBLE LIMITED | Axminster | A rating |
| BUKCS Limited | North Watford | A rating |
| Bukhara Culture Imports Limited | London | A rating |
| Bukhari & Sons Ltd | Liverpool | A rating |
| Bukhari Chambers | Milton Keynes | A rating |
| Bukhari Law Firm Ltd | Accrington | A rating |
| BUKHARI TECHNICAL SERVICES LTD | Manchester | A rating |
| Bukka Bites | Newport | A rating |
| BULANDI LTD | London | A rating |
| Bulb Limited t/a The Think Tank | London | A rating |
| Bulbshare | London | A rating |
| Bulgaro Ltd | Sittingbourne | A rating |
| Bulgin Ltd | Cambridge | A rating |
| Bulgroup LTD | Horam | A rating |
| BULK BUYING LIMITED | Rayleigh | A rating |
| Bulk Devices UK Limited | Wembley | A rating |
| Bulk Tainer Logistics Limited | Stokesley | A rating |
| Bulkhaul Limited | Middlesbrough | A rating |
| Bulkhead Limited | Derby | A rating |
| Bulkington Surgery | Bulkington | A rating |
| BULL BURGERS UK LTD | Urmston | A rating |
| BULL CARE SERVICES LTD | London | A rating |
| BULL PRIME SERVICES LTD | Bradford | A rating |
| Bull Products Ltd | Hereford | A rating |
| Bull Ring Fashion Ltd | Leicester | A rating |
| BULL'S GUARD LTD | England, | A rating |
| Bulldozer Media Ltd. | London | A rating |
| Buller and Rice | London | A rating |
| Bullet 69 Ltd | London | A rating |
| Bulletproof Cyber Ltd | Stevenage | A rating |
| Bulletproof Design Limited | London | A rating |
| Bullhorn International, Limited | LONDON | A rating |
| BULLIMORES SAND AND GRAVEL LTD | GRANTHAM | A rating |
| Bullion Productions | London | A rating |
| Bullish UK Services Ltd | London | A rating |
| Bullring Bakers Ltd | Birmingham | A rating |
| BULLS 1999 LTD T/AS STULLEN | London | A rating |
| BULLS EYE 1 SERVICES LIMITED | Manchester | A rating |
| Bullseye Awards and Garments Ltd | Slough | A rating |
| Bullseye Financial Ltd | London | A rating |
| Bulrush Fine Dining Limited | Bristol | A rating |
| BULRUSH HORTICULTURE LIMITED | BELLAGHY | A rating |
| Bulstrode Pub Limited | Hounslow | A rating |
| BULWARK CONSTRUCTION LTD | London | A rating |
| Bulwark Convenience Store | Chepstow | A rating |
| Bumade Healthcare Services Ltd | Chatham | A rating |
| Bumble Bees Day Nursery Ltd | London | A rating |
| Bumble Hole Foods Ltd | Bromsgrove | A rating |
| Bumblebee IT Solutions Ltd | Edenbridge | A rating |
| Bumblebeepower Ltd | London | A rating |
| BUMERANG LTD | Hertford | A rating |
| Bumi Armada UK Ltd | Aberdeen | A rating |
| Bumper International Limited | London | A rating |
| Bun & Base Ltd | Doncaster | A rating |
| BUN DISTRIBUTION LIMITED | HORSHAM | A rating |
| BUN HOUSE & TEA ROOM LIMITED | London | A rating |
| BUN SQUAD LIMITED T/A BUN SQUAD | High Wycombe | A rating |
| BUNAC Travel Services limited | London | A rating |
| BUNBUN TRADING LTD | Manchester | A rating |
| BUNCH CAPITAL LTD | Altrincham | A rating |
| Bundle Training Limited | London | A rating |
| Bundobust Ltd | Leeds | A rating |
| BUNGALOW CONVENIENCE STORE | Hartlepool | A rating |
| BUNNY HOP BY SAM'S LIMITED | Ayr | A rating |
| Buns & Grills | Marlborough | A rating |
| Buns From Home Ltd | London | A rating |
| BUNS ON FIRE LTD | London | A rating |
| Buntingford Healthcare Limited T/A Buntingford Pharmacy | Buntingford | A rating |
| BUNTY KITCHENS AND BEDROOMS LIMITED | Wokingham | A rating |
| Bunty's Chip Stop | Newcastle upon Tyne | A rating |
| BUNZL PLC | London | A rating |
| Bunzl UK Limited | Epsom | A rating |
| BUON APPETITO LIMITED | Barking | A rating |
| BUON CONSTRUCTION LTD | Nottingham | A rating |
| BUONKEY GENERAL TRADING UK LTD (15422771) | ENGLAND | UK Expansion Worker: Provisional |
| Buoyancy Aerospace Limited | London | A rating |
| BUOYANCY AEROSPACE V1 LIMITED | Barnoldswick | A rating |
| BUOYANT CARE UK LIMITED | West Drayton | A rating |