| Royal Bank of Canada | London | A rating |
| Royal College of Pharmacy | London | A rating |
| Royal Enfield (UK) Limited | Leicestershire | A rating |
| Royal Greenland Limited | Manchester | A rating |
| Royal IHC Limited | Newcastle upon Tyne | A rating |
| Royal Jordanian Airlines | LONDON | A rating |
| Royal Mail Group Limited | London | A rating |
| RPC Containers Limited | Corby, | A rating |
| RR Donnelley UK Directory Limited | Leeds | A rating |
| RS Data Tech Ltd | Manchester | A rating |
| RS GLOBAL LTD | Wembley | A rating |
| RS Group Plc | Corby | A rating |
| RSA Insurance Group Limited | London | A rating |
| RSA Security UK Ltd | London | A rating |
| RSHP Architects Ltd | London | A rating |
| RSK Group Limited | Helsby | A rating |
| RSL Group Holdings LTD | Teddington | A rating |
| RSM International Limited | London | A rating |
| RSM UK Tax and Accounting Limited | London | A rating |
| RSM US (UK) Ltd | London | A rating |
| RTB House Limited | London | A rating |
| RTB Technologies UK Limited | Watford | A rating |
| RTC Europe Limited | Sittingbourne | A rating |
| RTW Global Investments Ltd. | London | A rating |
| Rubie's Masquerade Company (UK) Limited | Bristol | A rating |
| Rubix Group International Limited | LONDON | A rating |
| Rubix Industrial Services Limited | Oldbury | A rating |
| Ruby Road Limited | London | A rating |
| Ruckus Wireless UK Limited | London | A rating |
| Ruder Finn UK Ltd | London | A rating |
| Ruggable UK Ltd | London | A rating |
| Ruijie Networks (UK) Limited | Reading | A rating |
| Ruisheng Holdings Limited | London | A rating |
| Runibex Technology Ltd. | London | A rating |
| Runtime Collective Limited t/a Brandwatch | Brighton | A rating |
| Russell Investments Systems Limited | London | A rating |
| Russell Reynolds Associates Limited | London | A rating |
| Rutgers UK | London | A rating |
| RWC Partners Limited | London | A rating |
| RWDI Anemos Limited | Milton Keynes | A rating |
| RWE Generation UK Plc | Swindon | A rating |
| RWE Renewables Management UK Limited | Wiltshire | A rating |
| RWE Supply & Trading GmbH | Swindon | A rating |
| RWS TRANSLATIONS LIMITED | Maidenhead | A rating |
| Ryan Specialty International Limited | London | A rating |
| Ryan Tax Services UK Limited | London | A rating |
| Ryobi Aluminium Casting (UK) Ltd | Carrickfergus | A rating |
| Rystad Energy Limited | London | A rating |
| S C Johnson Ltd | Camberley | A rating |
| S I GROUP - UK, LTD | Wolverhampton | A rating |
| S P Jain London School of Management Limited | London | A rating |
| S-RM INTELLIGENCE AND RISK CONSULTING LIMITED | London | A rating |
| S.A.F.I. Ltd | Poole | A rating |
| S.MIFSUD & SONS (UK) LIMITED | London | A rating |
| S.W.I.F.T. UK and Ireland Limited | London | A rating |
| S&B Foods Inc. UK Sales Office | London | A rating |
| S&P Global Limited | London | A rating |
| S&P Global UK Limited | London | A rating |
| SAAB UK LIMITED | London | A rating |
| SAAMA TECHNOLOGIES UK LTD | Surrey | A rating |
| SABIC UK Petrochemicals Limited | Redcar | A rating |
| Sabio SP Limited | London | A rating |
| Sabre Global Technologies Ltd | Richmond | A rating |
| SACHA ENGINEERING LTD | LIGHTHORNE | A rating |
| Sacyr UK Limited | London | A rating |
| SAFE-door Industries Limited | Brampton | A rating |
| SafeRad Ltd | Durham | A rating |
| Saferworld | London | A rating |
| SafetyCulture (UK) Ltd | Manchester | A rating |
| Safilo UK Ltd | London | A rating |
| Safintlon Limited | Stanmore | A rating |
| Safran Aerosystems Services UK Limited | Braintree | A rating |
| Safran Electrical & Power UK Ltd | Pitstone Green | A rating |
| SAFRAN ENGINEERING SERVICES UK Ltd | Gloucester | A rating |
| Safran Helicopter Engines UK Limited | Fareham | A rating |
| Safran Landing Systems UK Limited | Gloucester | A rating |
| Safran Seats GB Limited | Cwmbran | A rating |
| Safran UK Ltd | Gloucester | A rating |
| Sage Automotive Interiors Limited | Burnley | A rating |
| Sage Publications Ltd | London | A rating |
| Sagentia Ltd | Cambridge | A rating |
| Saggezza Limited (trading as Apexon) | Sunderland | A rating |
| SAGlobal Europe Ltd | Cardiff | A rating |
| Sahaj Software Solutions UK Limited | London | A rating |
| SAI Global Assurance Services Limited | Milton Keynes | A rating |
| SAIC Motor UK Technical Centre Limited | London | A rating |
| SAICA Pack UK Ltd | Manchester | A rating |
| SailPoint Technologies UK Ltd | London | A rating |
| Saint-Gobain Ltd | East Leake | A rating |
| Saipem Ltd | Kingston | A rating |
| Sakai Kuwahara Moving Service UK Ltd. | Southall | A rating |
| SAKAI TRANSEURO LTD | LODNON | A rating |
| Sakata UK Ltd | Boston | A rating |
| Saksoft Solutions Limited | Stockport | A rating |
| SAKURAI GRAPHIC SYSTEMS CORPORATIONS | London | A rating |
| Salesforce UK Limited | London | A rating |
| SalesLoft UK Limited | London | A rating |
| Salesroom UK Ltd | London | A rating |
| Sally Salon Services Limited | Bracknell | A rating |
| Salsify Global UK Limited | Bristol | A rating |
| Salt & Partners UK Ltd | London | A rating |
| SALUTE MISSION CRITICAL (EUROPE) LIMITED | Gatwick | A rating |
| Samadin Ltd | London, | A rating |
| Samaritan's Purse International Limited | Coventry | A rating |
| Samaya AI UK Limited | London | A rating |
| Samba London Ltd | London | A rating |
| SAMBA TV UK LIMITED | Cheltenham | A rating |
| SambaNova Systems UK Limited | London | A rating |
| Samsara Networks Limited | London | A rating |
| Samsons General Trading Limited | LONDON | A rating |
| SAMSUNG ASSET MANAGEMENT (LONDON) LTD | London | A rating |
| Samsung C&T UK Limited | Brentford | A rating |
| Samsung Cambridge Solution Centre Limited | Cambridge | A rating |
| Samsung Electronics (UK) Limited | Chertsey | A rating |
| Samsung Electronics (UK) Ltd (EHQ) | Chertsey | A rating |
| Samsung Electronics Research & Development Institute UK | Staines | A rating |
| Samsung Fire & Marine Insurance Company of Europe Ltd | London | A rating |
| Samsung Heavy Industries Liaison Office | London | A rating |
| Samsung Hospitality UK Ltd. | Chertsey | A rating |
| Samsung SDS Europe Ltd | Weybridge | A rating |
| Samsung Securities (Europe) Limited | London | A rating |
| Samsung SRA Asset Management UK | London | A rating |
| SAMT REBAR LTD | London | A rating |
| Samuel Banner & Co Limited | Runcorn | A rating |
| Samyang Foods UK limited | London | A rating |
| San-Ei Gen F.F.I.(U.K.) Ltd. | London | A rating |
| Sand Tech AI (UK) Ltd | London | A rating |
| Sandbrook Capital UK LLP | London | A rating |
| Sanden International (Europe) GmbH - UK Branch | Basingstoke | A rating |
| Sandhata Technologies Limited | Reading | A rating |
| Sandhata Technologies Ltd | London | A rating |
| SanDisk UK Limited | Slough | A rating |
| Sandleford Holdings (UK) Ltd | London | A rating |
| Sands Capital Advisors - UK LTD | London | A rating |
| Sandstone Technology (Europe) Ltd | Leeds | A rating |
| SANDTON LONDON EC1Y LIMITED | London | A rating |
| Sandvik Holdings Limited | Halesowen | A rating |
| Sanipex Limited | Birstall | A rating |
| Sanity UK Inc Ltd | Elstead | A rating |
| Sanko Gosei UK Ltd | Skelmersdale | A rating |
| Sannam S4 Ltd | London | A rating |
| Sanne Trustee Company UK Limited | London | A rating |
| Sans Training UK - Limited | London | A rating |
| Santa Fe Group Limited | London | A rating |
| Santam Specialist Business Limited | London | A rating |
| Santander Asset Management UK Limited | Glasgow | A rating |
| Santander UK PLC | Milton Keynes | A rating |
| Sany Heavy Machinery (UK) Ltd | Coatbridge | A rating |
| Sao Nam Ltd | London | A rating |
| SAP Fioneer UK Ltd. | London | A rating |
| SAP UK Limited | Feltham | A rating |
| Sapiens (UK) Limited | London | A rating |
| Sapient Limited | London | A rating |
| Sapphire Ventures (International) UK Ltd | London | A rating |
| Sappi Rockwell Solutions Limited | London | A rating |
| SAR Overseas Limited | London | A rating |
| SAR UK Limited | Plymouth | A rating |
| Saragossa Limited (UK) | London | A rating |
| Sarens UK Limited | Middlesborough | A rating |
| Sarla Advantech Private Limited t/a Sarla Advantech UK | Nuneaton | A rating |
| Sartorius Stedim Chromatography Systems Ltd | Havant | A rating |
| Sartorius Stedim Lab Limited | Stonehouse | A rating |
| Sartorius Stedim UK Limited | Epsom | A rating |
| SAS Software Limited | Marlow | A rating |
| Sasol UK Limited | London | A rating |
| Satair UK limited | Feltham | A rating |
| Satake Europe Ltd | Stockport | A rating |
| Satcom Direct International Limited | Hampshire | A rating |
| Satcom Direct International Limited | Farnborough | A rating |
| Sateba UK Limited | Ilkeston | A rating |
| Sato UK Ltd | Harwich | A rating |
| Satori Consulting International Ltd | London | A rating |
| SATURN F-1 PVT LTD | London | A rating |
| Saturn FE Ltd | Dundee | A rating |
| Satya Infotech Limited | Cheltenham | A rating |
| Satyam Venture Engineering Services Pvt Ltd | Warwick | A rating |
| Sauce Labs Software UK Limited | Reading | A rating |
| Saudi Arabian Airlines | Westminster | A rating |
| Savannah Energy PLC | London | A rating |
| Save The Children International | LONDON | A rating |
| Save the Children UK | Farringdon | A rating |
| Save The Elephants | London | A rating |
| Savencia Fromage & Dairy UK Ltd | Westbury | A rating |
| Savills plc | London | A rating |
| Savino Del Bene (UK) Ltd | Feltham | A rating |
| SAVIYNT EUROPE LTD | London | A rating |
| Sawtooth Software UK Limited | Ashton-Under-Lyne | A rating |
| Saxo Capital Markets UK Ltd | Canary Wharf | A rating |
| Say Digital Limited | London | A rating |
| Sayari Labs Limited | London | A rating |
| Saybolt United Kingdom Ltd | West Thurrock | A rating |
| SB Glasgow Limited T/As Saravanaa Bhavan | GLASGOW | A rating |
| SB Investment Advisers (UK) Limited | London | A rating |
| SB Tech UK, Ltd | London | A rating |
| SB TELECOM EUROPE LTD. | London | A rating |
| SBAR Endurance Limited T/A Let's Do This | London | A rating |
| SBC Systems (UK) Ltd | London | A rating |
| SBD Automotive Ltd | Milton Keynes | A rating |
| SBI INTERNATIONAL LIMITED | London | A rating |
| SBS Financial Software UK Ltd | Sheffield | A rating |