| apetito Ltd | TRowbridge | A rating |
| Apex Consolidation Entity Ltd | London | A rating |
| Apex Ultra Racing Limited | Woking | A rating |
| APFUTURA UK SERVICES LTD | London | A rating |
| API Foilmakers | Livingston | A rating |
| APi Group UK Holdco Limited | Ashford | A rating |
| APLL UK LTD | London | A rating |
| Apollo Enterprise Strategies UK Ltd | London | A rating |
| Apollo Fire Detectors Limited | Havant | A rating |
| Apollo Management International LLP | London | A rating |
| Apollo Research AI Ltd | London | A rating |
| Apollo Scientific Ltd | Denton | A rating |
| Apollo Tyres (UK) Holdings Ltd | LONDON | A rating |
| Appco UK Ltd | London | A rating |
| APPH Limited | Runcorn | A rating |
| Appian Base Metals Management Limited | London | A rating |
| Appian Europe Limited | London | A rating |
| Appinio Limited | London | A rating |
| Apple Europe Limited | London | A rating |
| Apple Tree Life Sciences (UK) Limited | London | A rating |
| Applexus Limited | Aberdeen | A rating |
| Applexus Technologies Limited | Hounslow | A rating |
| Applied Dynamics International Ltd. | Derby | A rating |
| Applied Materials UK Ltd | Reading | A rating |
| AppsFlyer UK Limited | London | A rating |
| Appsumer Limited | London | A rating |
| AppviewX Europe Limited | London | A rating |
| Appzen UK LTD | Reading | A rating |
| April International UK Ltd | London | A rating |
| Aprimo Marketing Operations UK Ltd | London | A rating |
| Apriori Technologies UK Limited | Belfast | A rating |
| Apris GB, Ltd | London | A rating |
| APS Polymer Ltd | London | A rating |
| Aptar UK Limited | Leeds | A rating |
| Aptia UK Limited | London | A rating |
| Aptitude Software Group plc | London | A rating |
| Aptiv Services UK Limited | Coventry | A rating |
| Aptos Solutions UK Ltd | London | A rating |
| AQR Capital Management (Europe) LLP | London | A rating |
| Aqua Security Software UK LTD | London | A rating |
| AQUAFARM EQUIPMENT (SCOTLAND) LIMITED | Glasgow | A rating |
| Aquagen Scotland Limited | Stirling | A rating |
| Aquatic Capital UK LLP | London | A rating |
| Aquazzura UK Limited | London | A rating |
| Aquent LLC | London | A rating |
| Aquidata Excel Ltd | Blackburn | A rating |
| Aquiline Capital Partners Limited | London | A rating |
| Arab National Bank | London | A rating |
| Arabelle Services UK Limited | Warwickshire | A rating |
| Arabesque Asset Management Ltd | London | A rating |
| Arabia Monitor Limited | London | A rating |
| Arachnys Information Services Limited | London | A rating |
| Arag PLC | CAERPHILLY | A rating |
| Aragawa UK Limited | London | A rating |
| Aramco Overseas Company UK Ltd | LONDON | A rating |
| Aramco Trading Limited | London | A rating |
| ARAMCO VENTURES LIMITED | London | A rating |
| Arax Properties Limited | London | A rating |
| Arbor Networks UK Limited | London | A rating |
| Arc Connect Limited | London | A rating |
| Arc Media Holdings Limited | London | A rating |
| Arcadia University | Holborn | A rating |
| Arcadis Human Resources Limited | London | A rating |
| Arcadis LLP | London | A rating |
| ARCE CLIMA UK LTD | LONDON | A rating |
| ArcelorMittal Distribution Solutions UK Ltd | Willenhall | A rating |
| ArcelorMittal Limited | LONDON | A rating |
| ArcelorMittal Shipping Ltd | London | A rating |
| Arceo Ltd | London | A rating |
| Arcese UK Ltd | Tilbury | A rating |
| Arcesium UK LLP | London | A rating |
| Arch Insurance (UK) Limited | London | A rating |
| ARCHER (UK) LIMITED | Aberdeen | A rating |
| Archer Aviation UK Limited | Bristol | A rating |
| Archer Daniels Midland (UK) Limited | Erith | A rating |
| Archer Hotel Capital B.V. | London | A rating |
| Archer Technologies UK Limited | Bristol | A rating |
| Archimydes Pvt Ltd | Alton | A rating |
| Arctic Wolf Networks UK Limited | Newcastle Upon Tyne | A rating |
| Arctos Europe LLP | London | A rating |
| Ardagh Glass Limited | Knottingley | A rating |
| Ardagh Metal Packaging UK Limited | Chester | A rating |
| Ardatem UK Ltd | Bristol | A rating |
| ARDEA PARTNERS INTERNATIONAL LLP | London | A rating |
| Ardian Investment UK Limited | LONDON | A rating |
| Ardmac Performance Contracting Limited | Manchester | A rating |
| Ardo UK | Charing | A rating |
| Aream Group LLP | London | A rating |
| Arena Investors UK Limited | London | A rating |
| Arendt & Medernach London Limited | London | A rating |
| Ares Management Limited | London | A rating |
| Areteans Technology Solutions UK Limited | London | A rating |
| ARGA Investment Management UK Limited | London | A rating |
| Argenta Syndicate Management Limited | London | A rating |
| Argentem Creek UK LLP | London | A rating |
| Argenx UK Ltd | Gerrards Cross | A rating |
| ARGO-HYTOS Ltd | Rotherham | A rating |
| Argon & Co UK Ltd | London | A rating |
| Argus Software (UK) Ltd | London | A rating |
| Aria Intelligent Solutions Limited | Oldham | A rating |
| Aria Systems UK Limited | London | A rating |
| Ariens Company Ltd | Chalgrove | A rating |
| Arimon Ltd T/A Digilytics | London | A rating |
| ARINC Inc | Crawley | A rating |
| Arisaig Partners Research Services (UK) Limited | London | A rating |
| Arise P&L Limited | London | A rating |
| ArisGlobal UK Limited | Wolverhampton | A rating |
| ARISTA NETWORKS UK LTD | London | A rating |
| Aristocrat Technologies Europe Ltd. | Uxbridge | A rating |
| Ark Consultants UK Ltd | Lancaster | A rating |
| ARKAIM ADVISORS LTD | LONDON | A rating |
| Arkas Investments Limited | London | A rating |
| Arkema UK Ltd | Stafford | A rating |
| Arken.legal (UK) Limited | Tunbridge Wells | A rating |
| Arla Foods Limited | Leeds | A rating |
| ARLETTIE LONDON LTD | London | A rating |
| Arm Limited | Cambridge | A rating |
| Armstrong Integrated Limited | Manchester | A rating |
| Arnold & Porter Kaye Scholer (UK) LLP | London | A rating |
| Aros Kapital Ltd | London | A rating |
| AROUNDTOWN REAL ESTATE MANAGEMENT (UK) LIMITED | London | A rating |
| Arqiva Ltd | Winchester | A rating |
| Arralis Technologies Ltd | Chippenham | A rating |
| Arria Data2Text Limited | Aberdeen | A rating |
| Arris Global Limited | Shipley | A rating |
| Arriva Limited | Sunderland | A rating |
| Arrk Limited | Manchester | A rating |
| ARRK Product Development Group Ltd | Quedgeley | A rating |
| Arrow Enterprise Computing Solutions Ltd | Harrogate | A rating |
| Arrow Global Limited | Manchester | A rating |
| Arrow International Media Limited | London | A rating |
| Arrow Medical Limited | Kington | A rating |
| ARROW SHIPPING (UK) LTD | London | A rating |
| Arrows Group Professional Limited | London | A rating |
| Arsenal Football Club | London | A rating |
| Art Partner Productions Limited | LONDON | A rating |
| ART.SY UK, LTD | London | A rating |
| Arteche UK Limited | Manchester | A rating |
| Artefact UK LTD | London | A rating |
| Artelia Projects UK Limited | London | A rating |
| Artemest UK Limited | London | A rating |
| Arthrex Limited | Sheffield | A rating |
| Arthur J Gallagher UK Limited | London | A rating |
| Arthur J. Gallagher Services (UK) Limited | London | A rating |
| ARTICLE 19 | London | A rating |
| Artifex Interior Systems Limited | Solihull | A rating |
| Artisan Partners UK LLP | London | A rating |
| Artlogic Media Limited | London | A rating |
| ARUK Global Ltd | Leamington Spa | A rating |
| Arval UK Group Limited | Swindon | A rating |
| Arvato SCM UK Limited | Coleshill | A rating |
| Aryaka Networks UK Limited | Hayes | A rating |
| AS London Shoreditch Operations B.V. | London | A rating |
| Asahi Europe & International Ltd | Woking | A rating |
| Asahi Glassplant UK Ltd | Royston | A rating |
| Asahi Shimbun Company (European General Bureau) | London | A rating |
| Asahi UK Ltd | Woking | A rating |
| Asana Software UK Limited | London | A rating |
| Asante Capital Group LLP | London | A rating |
| ASAPP Limited | London | A rating |
| Ascend Laboratories (UK) limited | London | A rating |
| Ascend SC Europe Limited | London | A rating |
| AscendantFX Capital UK Limited | Peterborough | A rating |
| Ascendion Engineering Solutions Europe Limited | London | A rating |
| ASCO UK Ltd | Aberdeen | A rating |
| Ascom | Lichfield | A rating |
| Ascot Underwriting Holdings Limited | London | A rating |
| Ascott Hospitality Management UK Ltd | London | A rating |
| Asda Stores Ltd | Leeds | A rating |
| ASE PLC | Manchester | A rating |
| Asendia UK Ltd | Hounslow | A rating |
| ASG Power Systems Limited | Newcastle Upon Tyne | A rating |
| ASHBY TECHNOLOGIES UK LTD | London | A rating |
| ASHINAGA ASSOCIATION IN THE UK | London | A rating |
| Ashmore Group Plc | London | A rating |
| Ashtad Limited | Glasgow | A rating |
| Ashtead Group Limited | London | A rating |
| Ashtrom Properties UK Limited | London | A rating |
| Ashurst LLP | London | A rating |
| Ashurst Perkins Coie (International) LLP | London | A rating |
| Asia Investments UK Private Limited | London | A rating |
| Asia Pacific World Holdings Limited | Southampton | A rating |
| Asia TV Limited | London | A rating |
| Asiana Airlines Inc. | London | A rating |
| ASICS UK Limited | Warrington | A rating |
| Asilia Africa UK Limited | London | A rating |
| ASKA Pharmaceutical Co., Ltd | London | A rating |
| Askable Ltd | London | A rating |
| Askonas Holt Limited | London | A rating |
| ASM Technologies (UK) Limited | Coventry | A rating |
| Asmodee UK Holding Limited | Bordon | A rating |
| ASMPT SMT UK Limited | Weymouth | A rating |
| ASO FAL UK Limited | London | A rating |
| ASOS.com | London | A rating |
| Aspect Capital Limited | London | A rating |
| Aspect Enterprise Solutions Limited | London | A rating |
| ASPECT Studios Limited | London | A rating |
| Aspecto Power Engineering Ltd. | Warwick | A rating |
| Aspen Insurance UK Limited | London | A rating |
| AspenTech Ltd | Reading | A rating |