| Blaize UK Ltd | Kings Langley | A rating |
| BLAK DIAMOND SOCIAL CARE LIMITED | Basildon | A rating |
| BlakBear Ltd | London | A rating |
| BLAKE & BOND LTD | LONDON | A rating |
| BLAKE & ERNST LIMITED | London | A rating |
| Blake Clough Consulting Ltd | Slaithwaite | A rating |
| Blake Morgan LLP | Southampton | A rating |
| Blake Newport Associates Ltd | Darlington | A rating |
| Blake, Cassels & Graydon LLP | London | A rating |
| Blakeney LLP | London | A rating |
| Blakesley Convenience Store | Towcester | A rating |
| Blakesmore Ltd | London | A rating |
| Blakewater Homecare Services Ltd | Blackburn | A rating |
| Blakewells Solicitors | London | A rating |
| Blam Pictures Ltd | Ruislip | A rating |
| Blanc Aero Industries UK Ltd | Rugby | A rating |
| Blanc Brasseries LTD | Teddington | A rating |
| Blanc Events Ltd | Newton Mearns | A rating |
| Blanchard Training and Development Inc | Guildford | A rating |
| Blanchards Inheritance Ltd | Ramsgate | A rating |
| Blanche Beauty Ltd | London | A rating |
| Blanchon UK Limited | Charing | A rating |
| Blanco Restaurants Ltd | Glossop | A rating |
| BLANCO UK Limited | St. Albans | A rating |
| Blancomet Recycling UK Limited | Stone | A rating |
| Blancomet Scot Limited | Dunfermline | A rating |
| Blandford Forum Specsavers Limited | Blandford Forum | A rating |
| Blandford House UK Ltd | Uxbridge | A rating |
| Blandford Medical Centre | Braintree | A rating |
| Blanefield Care Home | Glasgow | A rating |
| Blank Canvas | Redcar | A rating |
| BLANK COLLECTIVE LTD | London | A rating |
| Blank Street UK Limited | London | A rating |
| Blank Table Limited | Peterborough | A rating |
| Blantyre Capital Limited | London | A rating |
| BLANTYRE NEWS LTD | Hamilton | A rating |
| Blash Limited | London | A rating |
| Blast Esports Limited | London | A rating |
| Blast Loudspeakers Ltd | Brighton | A rating |
| Blast Theory | Brighton | A rating |
| BLASTA LTD | LONDON | A rating |
| Blatchford Central Services Ltd | Basingstoke | A rating |
| Blatchford Ltd | Basingstoke | A rating |
| Blaydon Specsavers Limited T/A Specsavers Opticians | Blaydon | A rating |
| Blayze Consulting Group Limited | London | A rating |
| Blaze and Barrel Limited | London | A rating |
| BLAZE PARKING MANAGEMENT LTD | Hounslow | A rating |
| BLAZE PIZZA SLOUGH LTD TA ROCCO'S PIZZA | Greenford | A rating |
| Blazehill Capital Limited | London | A rating |
| Blazing Griffin Ltd | Glasgow | A rating |
| Blazing Limited | Bolton | A rating |
| BLB LAKESIDE LTD T/A BRICK LANE BAGEL CO | Grays | A rating |
| BLC Corp-Serve Limited | London | A rating |
| Blck Cap Limited | London | A rating |
| BlckBx Ltd | London | A rating |
| BLE Lighting and Power Ltd | Mexborough | A rating |
| Bleach Products Limited | London | A rating |
| Bleat Post Production Ltd | London | A rating |
| Blecon Ltd | Cambridge | A rating |
| Blek Ltd t/a Big Licks | Glasgow | A rating |
| Blend and Brew Ltd | Toomebridge | A rating |
| BLEND CRAFTERS LIMITED | London | A rating |
| BLEND FAMILY LTD | Sheffield | A rating |
| Blend International UK Limited | London | UK Expansion Worker: Provisional |
| Blend Marketing Limited | Reading | A rating |
| Blend Media Ltd | London | A rating |
| Blend360 UK Ltd. | Edinburgh | A rating |
| BLENDCROSS LIMITED | LEWISHAM | A rating |
| Blends Flavours and Colours | Liverpool | A rating |
| BLENFORD LTD | Oxford | A rating |
| BLENGOLD LIMITED T/a Temple Indian Fusion | Woodford | A rating |
| Blenheim Baptist Church | Leeds | A rating |
| Blenheim Chalcot LTF Limited | London | A rating |
| Blenheim Global Ltd | London | A rating |
| Blenheim High School | Epsom | A rating |
| Blenheim Medical Centre | Luton | A rating |
| BLERO LTD | London | A rating |
| Bless Start Limited | London | A rating |
| BLESSDAY SERVICES LTD | Romford | A rating |
| Blessed George Napier Catholic School | Banbury | A rating |
| Blessed Hugh Faringdon Catholic School | Reading | A rating |
| Blessed Thomas Holford Catholic College | Altrincham | A rating |
| Blessing Dental Care Ltd | Paisley | A rating |
| Blessing Grace Ltd t/a CURA | Broxburn | A rating |
| Blessing Kuldevta Limited T/A Bukharaa The Street Zaika | Stockport | A rating |
| BLESSING'S CARE LTD | MILTON KEYNES | A rating |
| Blessings Daycare and Nursery LTD | Bradford | A rating |
| BLETCHLEY PJ PIZZA LIMITED T/A PAPA STADIUM MK, | Milton Keynes | A rating |
| Bletchley's Car Clinic Limited | Milton Keynes | A rating |
| BLEUBOLT LIMITED | Blackburn | A rating |
| BLEUCIRCLE LTD | London | A rating |
| Blevins Franks Wealth Management Limited | London | A rating |
| Blick Rothenberg Limited | London | A rating |
| BLIND 4 LESS LTD | England | A rating |
| Blind Spot | Mansfield | A rating |
| Blind Veterans UK | London | A rating |
| Blinds 4 Decor Ltd | Bradford | A rating |
| Blinds2go limited | Nottingham | A rating |
| BLING JEWELLERS LTD | London | A rating |
| Blingz Food Service Ltd | Liverpool | A rating |
| Blink & Brow Limited T/A Ayur Aesthetics, Hair & Beauty | North Wembley | A rating |
| Blink Charging UK Ltd | St Albans | A rating |
| Blink Image Limited | London | A rating |
| Blink Medical Limited t/a Corza Medical | Solihull | A rating |
| Blink Productions Limited | London | A rating |
| Blinq Ltd | London | A rating |
| Blinx Solutions Limited | Daresbury | A rating |
| Blippar Limited | London | A rating |
| Blis Global Ltd | London | A rating |
| BLISS BEAUTY LIMITED | SWINDON | A rating |
| BLISS BEAUTY SALON LUTON LIMITED | Luton | A rating |
| Bliss Care 3 Limited T/A Brandon House | Exmouth | A rating |
| BLISS CARE SOLUTIONS | EDINBURGH | A rating |
| BLISS CARE TORQUAY LIMITED | Torquay | A rating |
| BLISS CONVENIENCE STORE LTD | SAWBRIDGEWORTH | A rating |
| Bliss Eventworks Limited | Epsom | A rating |
| BLISS GROWTH LTD | Canterbury | A rating |
| BLISS ROUTE COURIER LTD | Salford | A rating |
| Bliss software solutions Ltd | Aylesbury | A rating |
| Bliss The Chelsea Clinic for Women and Children | London | A rating |
| Blisscars247 Ltd | Reading | A rating |
| Blissful Care Limited | Bournemouth | A rating |
| Blissful Living Ltd | Reading | A rating |
| BLISSHEALTH CONCEPTS LTD | Bedford | A rating |
| Blissi Ltd | London | A rating |
| Blisters Ltd | Midsomer Norton | A rating |
| Blitz Bolton | Bolton | A rating |
| Blitz Consulting Limited | Oxford | A rating |
| Blitz Enterprises Limited | Romford | A rating |
| Blitz Fibre Limited | London | A rating |
| Blitz Gooday Ltd | BUCKHURST HILL | A rating |
| Blitz International Holding Limited | Morecambe | A rating |
| BLK CAB COFFEE LTD | London | A rating |
| BLM-UK LTD | London | A rating |
| Bloc Digital Ltd | Derby | A rating |
| Bloc Hotel Group Limited | Gatwick | A rating |
| Bloch.UK.Limited | London | A rating |
| Block Aid Limited | Manchester | A rating |
| Block Asset Management Ltd | London | A rating |
| BLOCK DOX LIMITED | London | A rating |
| Block Property Solutions Limited | Mansfield | A rating |
| Block Scholes Ltd | London | A rating |
| BlockAPT Limited | London | A rating |
| Blockchain (GB) Limited | London | A rating |
| BLOCKCHAIN TECH LTD | Southend-On-Sea | A rating |
| BLOCKEYFI UK LIMITED | Glasgow | A rating |
| BlockRank Ltd | Cardiff | A rating |
| Blocks Online Limited | Harrow | A rating |
| Blockspace Group Ltd | London | A rating |
| Blockwise Network Limited | Manchester | A rating |
| Blocotelha-Steel Constructions UK | Liverpool | A rating |
| Blokees UK Limited | Newbury | A rating |
| Blond Ltd | London | A rating |
| BLOOBLOOM LIMITED | LONDON | A rating |
| Bloodgang Studioz UK Ltd | Dagenham | A rating |
| Bloods UK Limited | Grimsby | A rating |
| Blooloop Limited | Devon | A rating |
| BLOOM & GONSAI LIMITED | London | A rating |
| Bloom and Wild Limited | London | A rating |
| BLOOM BUSINESS SOLUTIONS LTD | London | A rating |
| Bloom Construction Group Ltd | London | A rating |
| Bloom Design Limited | London | A rating |
| Bloom Fresh International Ltd | London | A rating |
| Bloom Group Holding Ltd | London | A rating |
| BLOOM HEALTH GROUP LTD | LONDON | A rating |
| BLOOM HEALTH HOSPITALS LTD | MILTON KEYNES | A rating |
| Bloom Perfumery Ltd | London | A rating |
| Bloom Regulatory Ltd | London | A rating |
| Bloom Solihull Ltd | Solihull | A rating |
| Bloom Stones London Limited | London | A rating |
| Bloom Trade Limited | Glasgow | A rating |
| Bloom Unlimited UK Ltd | London | A rating |
| BLOOM&SQUARE LONDON LTD | London | A rating |
| Bloombar Watches Ltd | London | A rating |
| Bloomberg LP | London, | A rating |
| Bloomcare Greengables Ltd | Cheshire | A rating |
| BLOOMDEAN LIMITED | Harrogate | A rating |
| Bloomfield Medical Centre | Blackpool | A rating |
| Bloomfields Private Nursing Home t/a Bloomfield Care Homes Ltd | Belfast | A rating |
| Bloomfoods Limited T/A Heavenly Desserts Southampton | Southampton | A rating |
| Blooming Babies Day Nursery Limited | Stanford le hope | A rating |
| Blooming Cotswolds Limited t/a The Lilypad Florist | Stroud | A rating |
| Blooming Dance London Limited | London | A rating |
| Blooming Haus Ltd | London | A rating |
| BLOOMING SCENT LIMITED | LONDON | A rating |
| BLOOMING TULIPS MONTESSORI LTD | Northwood | A rating |
| BLOOMINGDALE RESIDENTIAL LIMITED | Stratford | A rating |
| BloomIQ Limited | Tunbridge Wells | A rating |
| Bloompark Software Services Ltd | Brentford | A rating |
| BloomReach UK Ltd | London | A rating |
| BLOOMS HEALTHCARE LIMITED | MANCHESTER | A rating |
| Blooms Nurseries Limited | Diss | A rating |
| Bloomsbury Football Foundation | London | A rating |
| Bloomsbury Glass Ltd | West Bromwich | A rating |
| BLOOMSBURY INSTITUTE LIMITED | London | A rating |
| Bloomsbury KG Limited | Clacton-On-Sea | A rating |
| Bloomsbury Publishing Plc | London | A rating |
| BLOOMSBURY REALTY MANAGEMENT LTD | Wembley | A rating |
| Bloomscare Ltd | Dagenham | A rating |
| BLOOP AI LIMITED | LONDON | A rating |