| Asper.AI Limited | North Harrow | A rating |
| Aspire FT UK Limited | London | A rating |
| Aspire Systems (India) Private Limited | London | A rating |
| Aspire Systems UK Ltd | London | A rating |
| Asprey Holdings Limited | London | A rating |
| ASSA ABLOY GLOBAL SOLUTIONS UK LIMITED | Olney | A rating |
| ASSA ABLOY Ltd | West Midlands | A rating |
| Assala Energy UK Limited | London | A rating |
| Assemble Technologies UK Ltd (t/a Atticus) | London | A rating |
| ASSEMBLY MEDIA LIMITED | London | A rating |
| Asset Management One International Ltd | London | A rating |
| Asset Management One International Ltd. | London | A rating |
| Asset One Services LLP | Bristol | A rating |
| Assicurazioni Generali S.p.A. UK Branch | London | A rating |
| Associated British Foods Plc | London | A rating |
| Associated Newspapers Ltd | London | A rating |
| Associates in Advertising Limited | London | A rating |
| Association of International Certified Professional Accountants (UK) | London | A rating |
| Assore International Holdings Limited | London | A rating |
| Assured Guaranty (UK) Services Limited | London | A rating |
| Assystem Energy & Infrastructure Limited | Bolton | A rating |
| AST SpaceMobile UK Limited | Leicester | A rating |
| Astellas Pharma Europe Ltd | Addlestone | A rating |
| Astemo UK Ltd | Bolton | A rating |
| Astex Therapeutics Limited | Cambridge | A rating |
| ASTOMOS ENERGY CORPORATION | LONDON | A rating |
| Aston Villa Football Club Limited | Birmingham | A rating |
| Astorg UK Branch | London | A rating |
| Astound Commerce Limited (UK) | London | A rating |
| AstraZeneca UK Limited | Cambridge | A rating |
| Astreya Limited | Cheltenham | A rating |
| Astroscale Ltd | Didcot | A rating |
| Asurion Europe Ltd | Brentford | A rating |
| ASUSTEK (UK) LIMITED | HEMEL HEMPSTEAD | A rating |
| Asymchem Limited | Sandwich | A rating |
| AT&T ISTEL | London | A rating |
| ATARIYA FOODS RETAIL (UK) LIMITED | Hove | A rating |
| Atariya Restaurant London Limited | London | A rating |
| ATB Group UK Limited | Norwich | A rating |
| ATC Brokers Ltd | London | A rating |
| Atcore Technology Limited | Slough | A rating |
| Atelier Ten London Limited | London | A rating |
| Atellior Limited | London | A rating |
| ATHENEUM LIMITED | London | A rating |
| Athletes' Performance UK Limited | London | A rating |
| Athlon Mobility Services UK Limited | Milton Keynes | A rating |
| Athora UK Services Limited | London | A rating |
| ATITECH UK | London | A rating |
| AtkinsRealis PPS Limited | London | A rating |
| AtkinsRealis UK Limited | London | A rating |
| Atlantic Projects Company (UK) Ltd | Derby | A rating |
| ATLANTIC UK INSURANCE AND REINSURANCE BROKERS LTD | LONDON | A rating |
| Atlantica Sustainable lnfrastructure Limited | London | A rating |
| Atlantis Operations (UK) Ltd | London | A rating |
| ATLAR TECHNOLOGY LTD | London | A rating |
| Atlas Converting Equipment Limited | Bedford | A rating |
| Atlas Copco Bolting Solutions (Tentec Ltd) | Wolverhampton | A rating |
| Atlas Copco IAS UK Limited | Deeside | A rating |
| Atlas Copco UK Holdings Ltd | Hemel Hempstead | A rating |
| ATLAS ELEKTRONIK UK Limited | Dorchester | A rating |
| Atlas FRM (UK) Ltd | London | A rating |
| Atlas Merchant Capital Holdings UK Limited | London | A rating |
| Atlas Services Group Energy Ltd | Bristol | A rating |
| Atlas Technology Solutions UK Limited | London | A rating |
| Atnahs Pharma UK Ltd T/A Pharmanovia | Basildon | A rating |
| Atolls London Limited | London | A rating |
| Atomy Distribution Limited | Guildford | A rating |
| Atos IT Services UK Ltd | London | A rating |
| Atout France | London | A rating |
| ATP Tour, Inc. | London | A rating |
| ATPAC Limited | Harthill | A rating |
| Atradius | Cardiff | A rating |
| Atricure UK Limited | Bristol | A rating |
| ATS Euromaster Limited | Aston | A rating |
| ATSUMI & SAKAI EUROPE LIMITED | London | A rating |
| Attentive Mobile UK Ltd | London | A rating |
| attune UK Limited | London | A rating |
| Atul UK Limited | Cheadle | A rating |
| atVenu UK LTD | Manchester | A rating |
| Auctane, Limited | London | A rating |
| Audax Management Company (UK) Limited | London | A rating |
| Audemars Piguet (UK) Limited | London | A rating |
| Augusta Aiken & Associates Limited | London | A rating |
| Augustea Shipping Services Limited | London | A rating |
| Aukera UK Limited | London | A rating |
| Aumovio Trading UK Ltd | Birmingham | A rating |
| Auriemma Consulting UK Ltd | London | A rating |
| Aurionpro (UK) Ltd | Billinghurst | A rating |
| Auronova Consulting Limited | Harrow | A rating |
| Aurora Future Technologies Limited | London | A rating |
| Aurora Healthcare Communications Limited | London | A rating |
| Aurora World Ltd | Basingstoke | A rating |
| Aurous Technology Limited | London | A rating |
| Austability Group | London | A rating |
| Australia & New Zealand Banking Group Ltd | London | A rating |
| Australia Post Global eCommerce Solutions (UK) Ltd | Milton Keynes | A rating |
| AUSTRALIAN SUBMARINE CORPORATION LIMITED | London | A rating |
| Australian Vintage (UK) Ltd | London | A rating |
| Australiansuper (UK) Ltd | London | A rating |
| Ausurus Group Ltd | Warrington | A rating |
| Autel Europe UK Limited | Borehamwood | A rating |
| Autex Acoustics Limited | Huddersfield | A rating |
| Autodesk Ltd | Birmingham | A rating |
| Autolus Ltd | London | A rating |
| Automatic Data Processing (ADP) Limited | Staines Upon Thames | A rating |
| Automation Anywhere UK Limited | London | A rating |
| Automus Consulting UK Limited | London | A rating |
| AutoProtect (MBI) Limited | Essex | A rating |
| Autosport Media UK Ltd | Isleworth | A rating |
| Autovista Limited | London | A rating |
| Autumnpaper Limited | London | A rating |
| Aux Merveilleux de Fred Ltd | London | A rating |
| AV OLD COMPTON STREET LTD T/A All'Antico Vinaio | London | A rating |
| Avalara Europe Limited | Brighton | A rating |
| Avalara Europe Ltd | BRIGHTON | A rating |
| AVALERE HEALTH GLOBAL LIMITED | London | A rating |
| Avaloq UK Limited | London | A rating |
| Avanade UK Limited | LONDON | A rating |
| Avance Consulting (Europe) Limited | London | A rating |
| Avansas Office Supplies Limited | London | A rating |
| AVANTI GAS LIMITED | CHESTERFIELD | A rating |
| Avantis Marine Limited | Cardiff | A rating |
| AVASO Technology Solutions Ltd | London | A rating |
| Avaya UK | London | A rating |
| Avecto Limited | Manchester | A rating |
| Avenir LNG M.S. Limited | London | A rating |
| Avensys UK Ltd | Kidderminster | A rating |
| aventis pharma Ltd t/a Sanofi | Reading | A rating |
| Aventum Group Management Services Limited | London | A rating |
| AvePoint UK Ltd. | London | A rating |
| Avery Dennison Materials UK Limited | Cramlington | A rating |
| AVERY DENNISON RETAIL INFORMATION SERVICES UK LIMITED | Nottingham | A rating |
| AVEVA Solutions Ltd | Cambridge | A rating |
| AVIAGEN LIMITED | NEWBRIDGE | A rating |
| Avian Labs Limited | London | A rating |
| AVIAREPS UK Ltd | London | A rating |
| AVIAT NETWORKS UK LIMITED | LONDON | A rating |
| AVIC CABIN SYSTEMS UK LIMITED | Christchurch | A rating |
| Avic International Holding Corporation | London | A rating |
| Avient Material Solutions UK Limited | Knowsley | A rating |
| Avigna Solutions Limited | Milton Keynes | A rating |
| AVINEON EUROPE LIMITED | LONDON | A rating |
| Avior Capital Markets International Limited | London | A rating |
| Avis Budget Services Limited | Bracknell | A rating |
| Aviura Limited | London | A rating |
| Aviva plc | London | A rating |
| AVL Powertrain UK Ltd | Basildon | A rating |
| AVMI Kinly Ltd | Sunbury on Thames | A rating |
| Avnet EMG Limited | Maidenhead | A rating |
| Avolution UK | London | A rating |
| Avon Cosmetics Limited | Northampton | A rating |
| AvroKO UK Ltd | London | A rating |
| AVSC Europe Limited | Uxbridge | A rating |
| Awardco Recognition Limited | London | A rating |
| Aware Super UK Limited | London | A rating |
| Awaze Vacation Rentals Ltd | Lowestoft | A rating |
| AWP Assistance UK Ltd. | Croydon | A rating |
| AXA Global Business Services Pvt Ltd (UK Branch) | London | A rating |
| AXA Global Healthcare (UK) Limited | Tunbridge Wells | A rating |
| AXA Group Operations UK Limited | Bristol | A rating |
| AXA Investment Managers Ltd | London | A rating |
| AXA Partners S.A.S | Redhill | A rating |
| AXA UK Plc | London | A rating |
| Axalta Coating Systems UK Limited | Welwyn Garden City | A rating |
| AXESS NORTH SEA LIMITED | ABERDEEN | A rating |
| AXIMA UK LTD | London | A rating |
| Axiom Global Limited | London | A rating |
| Axiom Manufacturing Services Limited | Newbridge | A rating |
| Axion Marketing Limited | London | A rating |
| Axis Communications UK Limited | Luton | A rating |
| AXIS Specialty Europe SE | London | A rating |
| AXISCADES UK LIMITED | FILTON | A rating |
| Axium Infrastructure UK Ltd | London | A rating |
| AXOLT Ltd | Reading | A rating |
| Axon Communications Inc. | London | A rating |
| Axon Public Safety UK Limited | Daventry | A rating |
| Axonius UK Limited | London | A rating |
| Axway UK Limited | Uxbridge | A rating |
| AYES CONSULTING UK Ltd | London | A rating |
| Azarine Limited | London | A rating |
| Azbil Telstar UK Ltd | BATLEY | A rating |
| Azenta UK Ltd | Manchester | A rating |
| AZERBAIJAN AIRLINES CLOSED JOINT STOCK COMPANY | LONDON | A rating |
| Azerion UK Limited | London | A rating |
| Azeus UK Ltd | London | A rating |
| Azimo Ltd | London | A rating |
| Azimut UK Holdings Limited | London | A rating |
| Aztiq UK Ltd | London | A rating |
| Azule Energy Holdings Limited | London | A rating |
| Azuma Foods UK Ltd. | London | A rating |
| Azura Advisors UK Ltd | London | A rating |
| AZURA PARTNERS LTD | LONDON | A rating |
| B Healthy Ltd | London | A rating |
| B Transfer Services Limited | London | A rating |
| B-FLEXION SERVICES (UK) LIMITED | LONDON | A rating |
| B. Braun Medical UK Ltd | Sheffield | A rating |
| B.A.I (UK), LIMITED | Plymouth | A rating |
| B.C. STRATEGY UK LIMITED | London | A rating |
| B.T.M TRAVEL AND TRADING LTD | Rugby | A rating |
| B&B Hotels UK Limited | London | A rating |