| BETTER SENSE LTD | London | A rating |
| Betterstore Self Storage Operations Limited | Ruislip | A rating |
| BetterUp UK Ltd | London | A rating |
| BEUMER Group UK Limited | Ashby-De-La-Zouch | A rating |
| Bev Global Limited | London | A rating |
| Beverage Services Limited | London | A rating |
| Beyond Hospitality Group Ltd | Wilmslow | A rating |
| Beyond Medi Spa Ltd | London | A rating |
| BF INTERNATIONAL BEST FIELDS BEST FOOD LIMITED | London | A rating |
| BG&E Consulting Engineers Ltd | London | A rating |
| BGL Group Ltd | Peterborough | A rating |
| BGP Atlantic Limited | Reigate | A rating |
| BGRS Global UK Limited | London | A rating |
| BGTS LTD | London | A rating |
| BHP Billiton International Services Limited | London | A rating |
| BI Worldwide Limited | Newport Pagnell | A rating |
| Biamp Systems | Wimbledon | A rating |
| Bibby Financial Services Limited | Adderbury | A rating |
| Bic UK Ltd | London | A rating |
| BicycleTx Limited | Cambridge | A rating |
| Biesse Group UK Limited | Daventry | A rating |
| Big Little Technology Limited (trading as beloFX) | Altrincham | A rating |
| BIG Partners Ltd | London | A rating |
| Big Picture Medical Limited | London | A rating |
| Bighand Limited | London | A rating |
| Bilfinger Piping Technologies UK Ltd | Bristol | A rating |
| Bilfinger UK Limited | Birchwood | A rating |
| Billions Europe Ltd | Stockon-on-tees | A rating |
| Billon Financial Ltd | London | A rating |
| Bilz Tool Ltd. | Coventry | A rating |
| BIMAN BANGLADESH AIRLINES | LONDON | A rating |
| Binary IS Limited | Harrogate | A rating |
| Bio Dynamics Tanks Ltd | Thurnscoe | A rating |
| Bio Products Laboratory Limited | Elstree | A rating |
| Bio-Techne Ltd | Abingdon | A rating |
| Biogen Idec Limited | Maidenhead | A rating |
| Bioline Agrosciences Ltd. | Little Clacton | A rating |
| BioMar | Grangemouth | A rating |
| BioMarin (UK) Limited | London | A rating |
| bioMerieux UK Limited | Basingstoke | A rating |
| Biomet UK Healthcare Ltd | Mid Glamorgan | A rating |
| BioNTech UK Limited | London | A rating |
| Biopak (UK) Ltd | Worcester | A rating |
| Biosimilars Newco Limited | London | A rating |
| Biosynth Limited | Newbury | A rating |
| Biotronik UK Limited | Bicester | A rating |
| Bird & Bird LLP | London | A rating |
| Bird Overseas Holdings Limited | London | A rating |
| BIRDLIFE INTERNATIONAL | CAMBRIDGE | A rating |
| Birds and Animals UK Ltd | tring | A rating |
| Birlasoft (UK) Ltd | London | A rating |
| BIRLASOFT SOLUTIONS LIMITED | London | A rating |
| Birmingham City Football Club Limited | Birmingham | A rating |
| Biscuit International UK. | Gateshead | A rating |
| Bitpanda GmbH UK Establishment | London | A rating |
| BITS IN GLASS UK LTD | Tunbridge Wells | A rating |
| Bitwise Global | London | A rating |
| Bizagi Limited | Chalfont St Peter | A rating |
| BKUK Group Limited | London | A rating |
| Blabla Connect Limited | London | A rating |
| Black & Decker | Maidenhead | A rating |
| Black & Veatch (U.K.) Limited | LONDON | A rating |
| Black and White Engineering Limited | Newcastle upon Tyne | A rating |
| Black Diamond Capital Management Limited | London | A rating |
| Blackbaud Europe Ltd | London | A rating |
| BlackBerry UK Limited | Maidenhead | A rating |
| BLACKBOARD (UK) LIMITED | Hampton | A rating |
| Blackbrook Capital (Europe) Limited | London | A rating |
| BlackFin Capital Partners UK Ltd | London | A rating |
| Blackhouse Media (BHM) Limited | Edinburgh | A rating |
| Blackline Systems Ltd | London | A rating |
| Blackmagic Design Ltd | Knutsford | A rating |
| BLACKROCK INVESTMENT MANAGEMENT (UK) LIMITED | LONDON | A rating |
| Blackstone Europe LLP | London | A rating |
| BLACKWATER TECH LTD | London | A rating |
| Blade Energy Partners Ltd | Aberdeen | A rating |
| Blaize UK Ltd | Kings Langley | A rating |
| Blake, Cassels & Graydon LLP | London | A rating |
| Blanchard Training and Development Inc | Guildford | A rating |
| BLANCO UK Limited | St. Albans | A rating |
| Blast Esports Limited | London | A rating |
| Blend360 UK Ltd. | Edinburgh | A rating |
| Blink Medical Limited t/a Corza Medical | Solihull | A rating |
| Bloch.UK.Limited | London | A rating |
| Blockchain (GB) Limited | London | A rating |
| Blocotelha-Steel Constructions UK | Liverpool | A rating |
| BLOOM&SQUARE LONDON LTD | London | A rating |
| Bloomberg LP | London, | A rating |
| BloomIQ Limited | Tunbridge Wells | A rating |
| BloomReach UK Ltd | London | A rating |
| BLS INTERNATIONAL SERVICES (UK) Ltd | London | A rating |
| Blue Cloud Global UK Limited | London | A rating |
| Blue Earth Foods Limited | Redditch | A rating |
| Blue Funnel Logistics Ltd | Harrow | A rating |
| Blue Heron Research Partners (UK) Limited | London | A rating |
| Blue Marlin Brand Design Limited | Frome | A rating |
| Blue Matter Consulting Ltd | London | A rating |
| Blue Owl Capital UK Limited | London | A rating |
| Blue Ridge Partners Management Consulting (UK) Ltd | London | A rating |
| Blue Water Logistics UK Limited | Manchester | A rating |
| Blue Water Shipping UK LTD | Manchester | A rating |
| Blue Yonder Technology Solutions (UK) Limited | Bracknell | A rating |
| Blue Yonder Technology Solutions UK Limited | Bracknell | A rating |
| BlueBinaries Engineering and Solutions Ltd | Woking | A rating |
| Bluebird IT Solutions Limited | High Wycombe | A rating |
| BlueBridge One Business Solutions Limited | Addlestone | A rating |
| BlueCrest Capital Management LLP | London | A rating |
| BLUEFIELD SERVICES LIMITED | Bristol | A rating |
| Blueground Furnished Apartments UK Ltd | London | A rating |
| BlueNord Energy UK Ltd | London | A rating |
| BlueOptima Limited | London | A rating |
| Blueprint Talent Group Limited | London | A rating |
| BluJay Solutions Ltd | Salford | A rating |
| BM&A London Limited | London | A rating |
| BMC Software Ltd | Winnersh Triangle | A rating |
| BMI Group Holdings UK Limited | Reading | A rating |
| BMI Healthcare Limited trading as Circle Health Group Limited | London | A rating |
| BMS Heavy Cranes UK Ltd | Irvine Innovation Center | A rating |
| BMT Group | London | A rating |
| BMW (UK) Holdings Limited | Farnborough | A rating |
| BNL UK Limited | Knaresborough | A rating |
| BNP PARIBAS ASSET MANAGEMENT SERVICES LIMITED | LONDON | A rating |
| BNP Paribas Asset Management UK Limited | London | A rating |
| BNP Paribas Leasing Solutions Limited | Basingstoke | A rating |
| BNP Paribas London Branch | London | A rating |
| BNP Paribas real Estate Advisory & Property Management UK Limited | London | A rating |
| Board MIT Ltd | London | A rating |
| Boardclic UK Limited | London | A rating |
| Boat Rocker Rights (UK) Ltd | London | A rating |
| Bobrick Washroom Equipment Limited | London | A rating |
| BOC Aviation (UK) Limited | London | A rating |
| BOC Limited | Woking | A rating |
| Boccard UK Limited | Sale | A rating |
| Boehringer Ingelheim LTD | Wokingham | A rating |
| Boeing Defence UK Limited | London | A rating |
| Boeing United Kingdom Limited | London | A rating |
| Boerboel Trading LLP | London | A rating |
| Boggi (UK) Limited | London | A rating |
| Boies Schiller Flexner (UK) LLP | London | A rating |
| BOILER ROOM (UK) LIMITED | London | A rating |
| BOKES Ltd | London | A rating |
| Bolashak International Limited | Farnborough | A rating |
| BOLD ELECTRIFICATION UK LTD | Woking | A rating |
| Boldyn Networks Group Limited | London | A rating |
| Bolero International Limited | Walton-on-Thames | A rating |
| BOLTON BG UK LIMITED | London | A rating |
| Boluda Towage UK Ltd | Liverpool | A rating |
| Bombardier Services (UK) Limited | Biggin Hill Airport | A rating |
| Bombora Wave Power Europe Ltd. | Pembroke Dock | A rating |
| BOND Events Limited | Staines-Upon-Thames | A rating |
| Booker Tate Limited | Thame | A rating |
| BOOKING.COM LIMITED | London | A rating |
| BOOKING.COM TRANSPORT LIMITED | Manchester | A rating |
| Bookmark Content Limited | London | A rating |
| Bookshoppe Limited | London | A rating |
| Boomi Corporation Limited | London | A rating |
| Booming Games (UK) Limited | Liecester | A rating |
| Boost & Co Limited | London | A rating |
| Boots Management Services | Nottingham | A rating |
| BOOZ ALLEN HAMILTON INTERNATIONAL (U.K.) LTD | Huntingdon | A rating |
| Boralex Ltd | Ringwood | A rating |
| BorgWarner Ltd | Bradford | A rating |
| Borr Drilling Land Support Limited | Westhill | A rating |
| BOS Wealth Management Europe S.A. | London | A rating |
| Bosch Global Software Technologies Private Limited | Denham | A rating |
| Bosch Lawn & Garden Limited | Stowmarket | A rating |
| Bosch Rexroth Limited | St Neots | A rating |
| Bose Limited | London | A rating |
| Bosideng Retail Ltd | London | A rating |
| Boskalis Subsea Limited | Billingham | A rating |
| Boskalis Subsea Services Limited | Aberdeen | A rating |
| Boskalis Westminster Ltd | Fareham | A rating |
| Boslan Engineering Limited | Cambridge | A rating |
| Boss Design Group | Dudley | A rating |
| Boston Limited | St Albans | A rating |
| Boston Partners (UK) Limited | London | A rating |
| Boston Scientific Limited | Hemel Hempstead | A rating |
| Bottomline Technologies Limited | Theale | A rating |
| Boult Wade Tennant LLP | London | A rating |
| Boundary Visualisation Limited t/a The Boundary | London | A rating |
| Bounteous UK Ltd | London | A rating |
| Bourne Partners UK Limited | London | A rating |
| Bourns Limited | Bedford | A rating |
| BOUYGUES (U.K.) LIMITED | London | A rating |
| Bouygues E&S Solutions Limited | London | A rating |
| BOUYGUES ENERGIES & SERVICES | Motherwell | A rating |
| Bow Street Hotel Limited | London | A rating |
| Bower Roebuck & Co. Ltd. | Holmfirth | A rating |
| Box Technologies Limited | Thame | A rating |
| Box.com (UK) Limited | London | A rating |
| BOYDEN EXECUTIVE SEARCH LIMITED | LONDON | A rating |
| BP plc | London | A rating |
| BPCE Equipment Solutions Limited UK | London | A rating |
| BPD Global Group Limited | London | A rating |
| Braavos Investment Advisers LLP | London | A rating |
| BRAC Saajan Exchange Limited | Birmingham | A rating |
| BRACEWELL (UK) LLP | London | A rating |
| BRADESCO SECURITIES UK LIMITED | LONDON | A rating |
| Bradford Swissport Limited | West Drayton | A rating |
| Brady Corporation Limited | Banbury | A rating |