| Allianz Global Investors UK Limited | London | A rating |
| Allianz Insurance plc | Guildford | A rating |
| Allied Digital Services UK Ltd | Lewins Mead | A rating |
| Allied Testing (UK) Limited | London | A rating |
| Allied World Assurance Company (Europe) Limited | London | A rating |
| Allied Worldwide Limited | London | A rating |
| Allison + Partners UK Limited | London | A rating |
| Alloy Therapeutics UK Limited | Cambridge | A rating |
| Allpress Espresso UK Ltd | London | A rating |
| Allstate Northern Ireland | Belfast | A rating |
| Alltaster Limited | London | A rating |
| Alltech (U.K.) Limited | Stamford | A rating |
| Allucent Group (UK) Limited | Bracknell | A rating |
| Allvue Systems Limited | London | A rating |
| Allwyn Entertainment Ltd | Watford | A rating |
| Allygrow Technologies UK Limited | Harrow | A rating |
| Almac Group Limited | Craigavon | A rating |
| Almirall Limited | Uxbridge | A rating |
| Alnylam UK Limited | Maidenhead | A rating |
| Alo Europe Limited | London | A rating |
| Alpek Polyester UK Ltd | Redcar | A rating |
| Alpenite Ltd | London | A rating |
| Alpha and Omega Semiconductor (UK) Limited | Bishop's Stortford | A rating |
| Alpha Bank London Ltd | London | A rating |
| ALPHA DATA PARALLEL SYSTEMS LTD | EDINBURGH | A rating |
| Alpha FX Limited | London | A rating |
| Alpha Wave Global, LLP | London | A rating |
| Alphadyne Asset Management (UK) LLP | London | A rating |
| AlphaGrep UK Limited | London | A rating |
| Alpharithm Technologies Limited | London | A rating |
| AlphaSense Technology Limited | London | A rating |
| AlphaSights Ltd | London | A rating |
| AlphaTheta EMEA Ltd | London | A rating |
| Alphawave IP Group PLC | London | A rating |
| Alpine Grove Partners (UK) Ltd | London | A rating |
| ALPLA UK Ltd | Golborne | A rating |
| Alps Alpine Europe GmbH | Milton Keynes | A rating |
| ALRAYAN BANK LTD | Birmingham | A rating |
| ALS Customs Services Limited | Manchester | A rating |
| Alstom Engineering and Services Limited | Derby | A rating |
| Alstom Transport UK Ltd | Birmingham | A rating |
| Alston & Bird LLP | London | A rating |
| Altair Engineering Ltd | Leamington Spa | A rating |
| Altair Global Relocation Limited | London | A rating |
| ALTAMOUNT CAPITAL UK LIMITED | London, | A rating |
| Altana Technologies UK Ltd | London | A rating |
| ALTEN GLOBAL TECHNOLOGIES | Cambridge, | A rating |
| ALTEN LIMITED | London | A rating |
| Alter Domus UK Limited | London | A rating |
| Altera Healthcare (IT) UK LTD | Birmingham | A rating |
| Altera Semiconductor Technology UK Limited | Marlow | A rating |
| Alteryx UK Limited | London | A rating |
| Altimetrik UK Ltd | Wokingham | A rating |
| Altis Global Limited | London | A rating |
| Altium UK Limited | Cambridge | A rating |
| Altman Solon LLP | London | A rating |
| Alton Aviation Consultancy UK Limited | London | A rating |
| Altos Labs UK Limited | Great Abington | A rating |
| Altrad Employment Services Limited | Rotherham, England | A rating |
| Altro Limited | Letchworth Garden City | A rating |
| Altum Capital Management (UK) Ltd | London | A rating |
| Altura Platform Ltd | London | A rating |
| AltynGold plc | Rikmansworth | A rating |
| Alula Technologies Ltd | London | A rating |
| Alvarez & Marsal Europe, LLP | London | A rating |
| Alvotech UK Limited | London | A rating |
| AM FRESH UK Ltd | Peterborough | A rating |
| Amada United Kingdom Limited | Kidderminster | A rating |
| Amadeus IT Services UK Limited | Hounslow | A rating |
| Amagi Media Private Limited | London | A rating |
| Amalgamated Metal Corporation Plc | London | A rating |
| Amano Enzyme Europe Limited | Chipping Norton | A rating |
| Amazon UK Services Ltd | London | A rating |
| Amazonico UK Limited | London | A rating |
| Amber Capital UK Holdings Ltd | London | A rating |
| Ambipar Response Limited | Bristol | A rating |
| Ambridge Europe Limited | London | A rating |
| AMC Consultants (UK) Limited | Reading | A rating |
| Amcor Europe Group Management | Bristol | A rating |
| Amcor Flexibles Swansea Limited | Swansea | A rating |
| Amdocs Management Ltd | London | A rating |
| Amelia Knight Limited | Knutsford | A rating |
| AMENTUM (UK) LTD | Warrington | A rating |
| Amer Sports UK Limited | Camberley | A rating |
| Amer Sports UK Services Limited | Irvine | A rating |
| America's Growth Capital Europe LLP | London | A rating |
| American Airlines | Harmondsworth | A rating |
| American Century Investment Management (UK) Limited | London | A rating |
| American Express Services Europe Limited | London | A rating |
| American International Group UK Limited | London | A rating |
| American International Relocation Solutions UK Limited | London | A rating |
| American Lawyer Media International Limited | London | A rating |
| AMERICAN TECHNO CONTROLS LTD | Cheadle | A rating |
| Americaneagle.com UK Limited | Brighton | A rating |
| Americold Whitchurch Ltd | Whitchurch | A rating |
| Ametek European Holdings Limited | Leicester | A rating |
| Amey Services Limited | Liverpool | A rating |
| Amgen Limited | Cambridge | A rating |
| Amiad Water Systems UK Limited | Bristol | A rating |
| Amicorp (UK) Limited | London | A rating |
| Amira G Foods Ltd | London | A rating |
| Amius Group Limited | London | A rating |
| AML RightSource Limited | Altrincham | A rating |
| Amnesty International, International Secretariat | London | A rating |
| Amorepacific UK Limited | London | A rating |
| Amorigin Limited | London | A rating |
| Amorim Top Series Scotland Limited | Dundee | A rating |
| AMOT UK Holdings Limited | Bury St Edmunds | A rating |
| Amova Asset Management UK Limited | London | A rating |
| Amperity UK Limited | London | A rating |
| Ampersand Management UK Ltd | London | A rating |
| Amphenol Limited | Whitstable | A rating |
| Amphora UK Limited | London | A rating |
| Amplience (UK) Limited | London | A rating |
| Amplitude Analytics Limited | London | A rating |
| AmSafe Bridport | Bridport | A rating |
| Amsi Consultancy Services | Derby | A rating |
| AMTD London Development Co Limited | London | A rating |
| AmTrust Management Services Ltd. | London | A rating |
| Amundi (UK) Limited | London | A rating |
| AMV BBDO Ltd | London | A rating |
| Amway (Europe) Limited | Birmingham | A rating |
| AMWINS GLOBAL RISKS GROUP LIMITED | London | A rating |
| Anacapa Wavepower Ltd. | London | A rating |
| Anaconda Services (UK) Limited | Richmond, London | A rating |
| Anacta Strategies UK Ltd | London | A rating |
| Analysis Group Ltd | London | A rating |
| Analytic Partners U.K. Limited | London | A rating |
| Anaplan Limited | London | A rating |
| ANASURIA HIBISCUS UK LIMITED | Aberdeen | A rating |
| Anasuria Operating Company Ltd | Aberdeen | A rating |
| Ancestry.com UK Limited | London | A rating |
| Anchanto Ltd | Weybridge | A rating |
| Anchorage Capital Advisors Europe LLP | London | A rating |
| Anchorage Capital Europe LLP | London | A rating |
| Andaz Hotel | London | A rating |
| ANDERSON BRECON UK LIMITED | CARDIFF | A rating |
| Anderson Mori & Tomotsune UK Limited | London | A rating |
| Andor Technology | Belfast | A rating |
| ANDRITZ Hydro Hammerfest (UK) Limited | Glasgow | A rating |
| ANDRITZ Limited | Newcastle Under Lyme | A rating |
| Andros UK Limited | Frome | A rating |
| Andurand Capital Management LLP | London | A rating |
| Anduril Industries UK Limited | Cheltenham | A rating |
| Anel Engineering & Contracting Limited | Chester | A rating |
| Anera Labs UK Ltd | London | A rating |
| Anergi International Limited | London | A rating |
| Angeion Group International | London | A rating |
| Angelini Pharma UK-I Limited | London | A rating |
| Angelo, Gordon Europe LLP | London | A rating |
| Anglia Home Furnishings Ltd | Peterborough | A rating |
| Anglo American Crop Nutrients Limited | London | A rating |
| Anglo American Crop Nutrients Limited | Whitby | A rating |
| Anglo American Services (UK) Limited | London | A rating |
| Anglo Caribbean Insurance Agents Limited | London | A rating |
| Anglo Galleon International Ltd | London | A rating |
| Anglo-Eastern (UK) Ltd | Glasgow | A rating |
| Angra Limited | London | A rating |
| Animal Friends Insurance | Salisbury | A rating |
| Animore Limited | London | A rating |
| Anixter Limited | Bracknell | A rating |
| Anixter Ltd | Bracknell | A rating |
| Anji Logistics (UK) Limited | London | A rating |
| Anker Technology (UK) Ltd | Watford | A rating |
| Ankorstore Ltd | London | A rating |
| Ankura Consulting (Europe) Limited | London | A rating |
| Annata Limited | Portsmouth | A rating |
| Anomali Ltd | Belfast | A rating |
| Anomaly UK Limited | London | A rating |
| Anritsu | Luton | A rating |
| Ansaldo Energia Switzerland Ltd | Wolverhampton | A rating |
| Anschutz Sports Holdings Ltd. | London | A rating |
| ANSELL ELECTRICAL PRODUCTS LIMITED | Warrington | A rating |
| Ansimicro Software UK Limited | Gloucester | A rating |
| ANSYS UK Ltd | Sheffield | A rating |
| Ant Yapi (UK) Limited | London | A rating |
| Antares Global Management Limited | London | A rating |
| Antavo Limited | London | A rating |
| Anthemis (UK) Limited | London | A rating |
| Anthesis (UK) Limited | London | A rating |
| Anthropic Limited | London | A rating |
| Antin Infrastructure Partners UK Limited | London | A rating |
| Antithesis UK Limited | London | A rating |
| Antofagasta plc | London | A rating |
| AntWorks Solutions Limited | London | A rating |
| Anuvu UK Operations Limited | Great Warley, Brentwood | A rating |
| Anysphere UK Ltd | Cheltenham | A rating |
| Anywhereworks Ltd | Edinburgh | A rating |
| ANZCRO UK | Pool | A rating |
| Aon UK Limited | London | A rating |
| AOTO Electronics (UK) Ltd | Brentford | A rating |
| Aozora Europe Limited | London | A rating |
| AP Audit UK Limited | London | A rating |
| AP AUDIT UK LTD | London | A rating |
| AP Racing Limited | Coventry | A rating |
| Apache North Sea Limited | Aberdeen | A rating |
| Apax Partners UK Ltd | London | A rating |
| APCO Technologies Services Ltd | Didcot | A rating |
| APCO Worldwide | London | A rating |
| APERTA LTD | Cumbernauld | A rating |