| Advanced Markets (UK) Limited | London | A rating |
| Advanced Medical Solutions Limited | Winsford | A rating |
| Advanced Micro Devices (U.K.) Limited | CAMBRIDGE | A rating |
| Advanced Personnel Management Group (UK) Ltd | Birmingham | A rating |
| Advanced Solutions International (Europe) Ltd | Shoreham by Sea | A rating |
| Advanex Europe Limited | Southwell | A rating |
| Advania UK Limited | Manchester | A rating |
| Advansys Engineering Services and Consultancy Limited | Camberley | A rating |
| Advantech Europe BV UK Branch | London | A rating |
| Advanz Pharma Services (UK) Limited | London | A rating |
| Advent International Ltd | London | A rating |
| Advention Business Partners (UK) Limited | London | A rating |
| Adventurous Journeys UK Ltd | London | A rating |
| Advokatfirmaet Kromann Reumert | London | A rating |
| Advokatfirmaet Thommessen AS | London | A rating |
| ADYEN N.V. LONDON BRANCH | London | A rating |
| AE Industry UK Branch | London | A rating |
| AE Portsoken Asset Management Ltd | Hampstead | A rating |
| AEA Investors (UK) LLP | London | A rating |
| AECOM LIMITED | London | A rating |
| AEG Fuels UK Limited | Crawley | A rating |
| AEG Presents Ltd | London | A rating |
| Aegean Airlines SA | Hounslow | A rating |
| AEGIS OUTSOURCING UK LIMITED | Harrow, | A rating |
| Aegis Trust | Nottingham | A rating |
| Aegis UK - Recruiting and Consulting Ltd | London | A rating |
| AEGON UK PLC | London | A rating |
| AEP PRECISION CO., LTD UK Branch | London | A rating |
| Aermont Capital LLP | London | A rating |
| Aertec Solutions Ltd | Chester | A rating |
| AESC UK PLANT 1 LIMITED | Sunderland | A rating |
| Aesop UK Limited | London | A rating |
| AET UK Ltd | London | A rating |
| AETN INTERNATIONAL (UK) LIMITED | London | A rating |
| Affectiva UK Ltd | London | A rating |
| Affiliated Managers Group Limited | London | A rating |
| Affinity (Shipping) LLP | London | A rating |
| Affinius Capital UK Ltd | London | A rating |
| AFFIRM UK LTD | London | A rating |
| AFH Stores UK Limited | London | A rating |
| Afiniti Europe Technologies Limited | London | A rating |
| AFL Telecommunications UK Limited | Milton Keynes | A rating |
| Aflex Hose Limited | Huddersfield | A rating |
| Africa Specialty Risks Limited | London | A rating |
| Africell UK Ltd | London | A rating |
| AFRY Management Consulting Limited | Oxford | A rating |
| AFT Pharma UK Limited | London | A rating |
| AFTON CHEMICAL LIMITED | BRACKNELL | A rating |
| AG UK 2018 Limited | London | A rating |
| AGC Chemicals Europe, Ltd. | Thornton Cleveleys | A rating |
| AGC Glass UK Limited | Northampton | A rating |
| Agco Limited | Stoneleigh | A rating |
| AgDevCo Limited | London | A rating |
| Ageas Insurance Limited | Eastleigh | A rating |
| AGG UK Limited | London | A rating |
| Aggreko UK Limited | Cannock | A rating |
| AGICAP UK LIMITED | London | A rating |
| AGILENT TECHNOLOGIES LDA UK LIMITED | Cheshire | A rating |
| AGILETS UK LIMITED | HARROW | A rating |
| Agilio Software Bidco Ltd. | Sheffield | A rating |
| Agilisys Holdings Ltd | Wigan | A rating |
| Agilysys UK Ltd | Windsor | A rating |
| AGODA INTERNATIONAL PTE LTD | London | A rating |
| Agratas Limited | London | A rating |
| Agree2Act Ltd | West Malling | A rating |
| Agreena Technology Limited | London | A rating |
| Agricultural Bank of China Limited London Branch | London | A rating |
| AGS AIRPORTS LIMITED | PAISLEY | A rating |
| AH UK Animal Health (PVT) Ltd | London | A rating |
| AHEAD UK Solutions Limited | Wokingham | A rating |
| Ahlstrom-Munksjo Chirnside Limited | Duns | A rating |
| AHR Group Limited | Huddersfield | A rating |
| Ahrend Ltd | London | A rating |
| AI-Media UK B Ltd | London | A rating |
| AIB Group (UK) Plc | Belfast | A rating |
| Aibidia UK Limited | London | A rating |
| AiDash UK Limited | London | A rating |
| AIDEM TECHNOLOGIES LTD | London | A rating |
| AIMG UK Limited | London | A rating |
| AIMPOINT DIGITAL UK LIMITED | London | A rating |
| AIMS Solutions UK Limited | Rickmansworth | A rating |
| Aimsun Limited | London | A rating |
| AIN ESC UK LIMITED | LONDON | A rating |
| Aioi Nissay Dowa Insurance Management Limited | London | A rating |
| Aion Silicon Ltd | London | A rating |
| AIP Management P/S | London | A rating |
| AIPHONE UK LIMITED | London | A rating |
| Air Algerie | London | A rating |
| Air Astana JSC | London | A rating |
| Air Bearings Ltd | Ferndown | A rating |
| Air Cargo Ltd | Colnbrook | A rating |
| Air Charter Service Plc | Surbiton | A rating |
| Air China Limited | London | A rating |
| Air India | Brentford | A rating |
| Air Liquide UK Ltd | Birmingham | A rating |
| Air Navigation Solutions Limited | Gatwick Airport | A rating |
| Air Partner Limited | Gatwick | A rating |
| Air Products Plc | Guildford Road | A rating |
| AIR Worldwide Ltd | London | A rating |
| AIRBAGS INTERNATIONAL LIMITED | Congleton | A rating |
| Airbnb UK Limited | London | A rating |
| Airbus Belfast Limited | Belfast | A rating |
| Airbus Defence and Space Limited | Portsmouth | A rating |
| Airbus Helicopters UK Limited | Kidlington | A rating |
| Airbus Operations Limited | Bristol | A rating |
| Airbus Protect Limited | Bristol | A rating |
| Aircall UK Ltd | London | A rating |
| AIRCOM International Ltd | Leatherhead | A rating |
| Aircraft Leasing & Management Limited | Crawley | A rating |
| Aire Ancient Baths London Ltd | London | A rating |
| Airedale International Air Conditioning Ltd | Leeds | A rating |
| Airline Tariff Publishing Company (ATPCO) | London | A rating |
| Airspan Communications Limited | Slough | A rating |
| AIRSYS COMMUNICATIONS TECHNOLOGY LIMITED | Romsey | A rating |
| Airtel Africa plc | London | A rating |
| Airwallex (UK) Limited | London | A rating |
| AIRZETA CO., LTD | Stanwell | A rating |
| Aisin Europe Manufacturing (UK) Limited | Birmingham | A rating |
| AIT WORLDWIDE (UK) LOGISTICS LIMITED | SLOUGH | A rating |
| AKA, Chartered Accountants | BIRMINGHAM | A rating |
| Akamai Technologies Limited | London | A rating |
| Akelius Residential Limited | London | A rating |
| Aker Solutions Ltd | Aberdeen | A rating |
| AKG (UK) Learning Limited | London | A rating |
| Akhtar Rizvi Films Ltd | London | A rating |
| Akhter Group plc | Harlow | A rating |
| Akin Gump Strauss Hauer & Feld | London | A rating |
| AKIS SOLAR UK LTD | NORTHAMPTON | A rating |
| AKQA Ltd | London | A rating |
| Aksia Europe Ltd | London | A rating |
| Akuna Europe Limited | London | A rating |
| AKWEL BIRMINGHAM UK Limited | Sutton Coldfield | A rating |
| AL SHIRA-AA FARMS LIMITED | GODALMING | A rating |
| AL-AYN SOCIAL CARE FOUNDATION | London | A rating |
| Al-Imdaad Foundation UK | BLACKBURN | A rating |
| Al-Jazeera Satellite Channel Limited | London | A rating |
| AL-KO Kober Limited | Southam | A rating |
| Alantra Corporate Portfolio Advisors International Limited | London | A rating |
| Alantra Partners International Limited | London | A rating |
| Alaric Securities (UK) Ltd | London | A rating |
| ALARIS THE RF TECHNOLOGY GROUP LTD | LINCOLN | A rating |
| ALASKA AIRLINES | London | A rating |
| Alatas UK Limited | Bradford | A rating |
| Alation UK Ltd | London | A rating |
| ALB UK Construction & Development Ltd | South Cave | A rating |
| Alba Bioscience Limited | Penicuik | A rating |
| Alba Bioscience Limited (T/A Quotient) | Penicuik | A rating |
| AlbaCore Capital LLP | London | A rating |
| Albatross Travel Group Limited | Larkfield | A rating |
| ALBEA UK LTD | Colchester | A rating |
| Alberta Investment Management Corporation | London | A rating |
| Albion Saddlemakers Company Limited | Walsall | A rating |
| Albourne Partners Limited | London | A rating |
| Alcatel Submarine Networks UK Ltd | London | A rating |
| Alcoa Services UK Limited | Bristol | A rating |
| Alcohol Monitoring Systems Limited | London | A rating |
| Alcom Renewables UK Limited | London | A rating |
| Alcon Eye Care (UK) Ltd | Camberley | A rating |
| Aldermore Group PLC | Manchester | A rating |
| Aldersgate Holding Company Limited | London | A rating |
| Aldi Stores Limited | Atherstone | A rating |
| Aleees UK Ltd | London | A rating |
| Alert Logic UK LTD | Cardiff | A rating |
| Alexander Dennis Limited | Larbert | A rating |
| Alexander Mann Solutions Limited | London | A rating |
| Alexander Proudfoot (Europe) Ltd. | London | A rating |
| Alfa Energy Limited | London | A rating |
| Alfa Laval Ltd | Camberley | A rating |
| Alfasigma UK Limited | Cambridge | A rating |
| Alfred H Knight Holdings Ltd | Prescot | A rating |
| Algolia Limited | London | A rating |
| Algorithmic Strategies (UK) Ltd. | London | A rating |
| Algorithms Software UK Ltd | London | A rating |
| Aliaxis Holding UK Limited | Lenham | A rating |
| ALIBABA CLOUD (EUROPE) LIMITED | London | A rating |
| Alida Solutions Ltd | London | A rating |
| Align Communications International Ltd. | London | A rating |
| Align Technology UK Limited | Solihull | A rating |
| Alimak Group UK Ltd | Rushden | A rating |
| Alimetry UK Limited | London | A rating |
| Alipay (UK) Limited | London | A rating |
| AlixPartners UK LLP | London | A rating |
| ALK-Abello Limited | Reading | A rating |
| All Metal Services Limited | Sutton Coldfield | A rating |
| All Nippon Airways Co Ltd | London | A rating |
| All Saints Retail Limited | London | A rating |
| All World Foods Limited | London | A rating |
| ALL.SPACE Networks Limited | Reading | A rating |
| Allbound UK Limited | London | A rating |
| Allegion (UK) Limited | Birmingham | A rating |
| Allegion Safety & Security Solutions Limited | Bury | A rating |
| Allegis Group Limited | Bracknell | A rating |
| Allegro MicroSystems Europe Limited | Musselburgh | A rating |
| Allen Overy Shearman Sterling Service Company Limited | London | A rating |
| Allfunds Bank | London | A rating |
| Alliance Healthcare Management Services Limited | Chessington | A rating |
| Alliance Medical Limited | Warwick | A rating |
| Alliance One International Services Ltd | Camberley | A rating |
| AllianceBernstein Limited | London | A rating |
| Allianz Global Corporate & Specialty SE | London | A rating |