| SC Europe Limited | London | A rating |
| SC Johnson Professional Group ltd | Ripley | A rating |
| SC Lowy Asset Management (UK) Ltd | London | A rating |
| Scaffolding Management & Construction Services (UK) Limited | Birmingham | A rating |
| Scale AI Limited | London | A rating |
| Scaleup Finance UK Limited | London | A rating |
| Scality Limited | London | A rating |
| SCANDINAVIAN ENERGY CONTRACTOR OPERATIONS LIMITED | STOKE ON TRENT | A rating |
| Scandinavian Tobacco Group United Kingdom Ltd | St Albans | A rating |
| Scandit Ltd | London | A rating |
| Scania (Great Britain) Limited | Milton Keynes | A rating |
| SCANIA FINANCE GREAT BRITAIN LTD | Milton Keynes | A rating |
| SCANNELL MANAGEMENT UK LIMITED | London | A rating |
| Scapa Group Limited | Ashton Under Lyne | A rating |
| Scapa UK Limited | Manchester | A rating |
| SCARAB SWEEPERS LTD | TONBRIDGE | A rating |
| Scarlet Global Holdings Ltd | London | A rating |
| SCB & Associates Limited | London | A rating |
| Scen Agency Ltd | London | A rating |
| Schaeffler (UK ) Ltd | Sheffield | A rating |
| SCHINDLER LIMITED | Addlestone | A rating |
| Schjodt LLP | London | A rating |
| Schleich UK Ltd | Watford | A rating |
| Schlumberger Cambridge Research Limited | Cambridge | A rating |
| Schlumberger Oilfield UK Limited | Crawley | A rating |
| Schlumberger Oilfield UK Ltd | Westhill | A rating |
| Schmidt & Bender (UK) Ltd. | Ashford | A rating |
| Schmidt Groupe UK Ltd | London | A rating |
| Schmitz Cargobull (U.K.) Limited | Manchester | A rating |
| Schneider Electric Systems UK Limited | Telford | A rating |
| Schneider Electric UK Ltd | Telford | A rating |
| Schoeller Allibert Limited | Winsford | A rating |
| Scholl's Wellness Company Ltd | Bracknell | A rating |
| Schoola Limited | Sutton | A rating |
| Schrader Electronics Ltd | Antrim | A rating |
| Schreiber Foods UK Limited | Stonehouse | A rating |
| Schroder Investment Management Limited | London | A rating |
| Schroders Greencoat LLP | London | A rating |
| Schrodinger Technologies Limited | London | A rating |
| Schuh Ltd | Livingston | A rating |
| Schulte Hospitality Group UK Limited | London | A rating |
| Schweitzer Engineering Laboratories UK Limited | Stafford | A rating |
| Schwing Stetter (UK) Ltd | Marlow | A rating |
| Science Applications International Corporation (UK) Ltd | Guildford | A rating |
| SCIENION (UK) Limited | Portsmouth | A rating |
| Scientific Drilling Controls Limited | Dyce | A rating |
| Sciforma UK Ltd | Leeds | A rating |
| Scitech Engineering Limited | Godalming | A rating |
| Scitech Engineering Ltd | Godalming | A rating |
| SCM Group (UK) Limited | Bulwell | A rating |
| Scope Inspection Limited | London | A rating |
| Scopely UK Limited | London | A rating |
| SCOR SE - UK Branch | London | A rating |
| SCOTT BADER UK LIMITED | Wellingborough | A rating |
| Scott Brownrigg Ltd | Guildford | A rating |
| Scott Dunn Limited | London | A rating |
| Scott Health & Safety Limited | Skelmersdale | A rating |
| ScottishPower Limited | Glasgow | A rating |
| SCR London Limited | London | A rating |
| Screen Europe (UK) | Kings Langley | A rating |
| ScreenCloud Limited | London | A rating |
| Screening Eagle UK Limited | Cambridge | A rating |
| Scrum Inc UK Limited | London | A rating |
| SCSK EUROPE LTD. | London | A rating |
| Sculptor Capital Management Europe Limited | London | A rating |
| SD Worx UK Limited | Salford | A rating |
| SDC Capital Partners Limited | London | A rating |
| SDC Trailers Limited | Toomebridge | A rating |
| SDG Group UK&I Ltd | MILTON KEYNES | A rating |
| Sdip Holdings UK Limited | Reading | A rating |
| SDMO Energy Limited | Hook | A rating |
| Sea Containers Hotel Limited | London | A rating |
| Sea Dragon Energy (UK) Ltd | London | A rating |
| SEAB Power Ltd | London | A rating |
| Seabury Securities (UK) Limited | London | A rating |
| Seadrill Management Ltd | Liverpool | A rating |
| Seagate Technology (Ireland) | Londonderry | A rating |
| SEAH WIND LTD | Middlesbrough, | A rating |
| Sealand Projects Limited | Aberdeen | A rating |
| Seamark Group Limited | Manchester | A rating |
| Seapeak Maritime (Glasgow) Limited | Glasgow | A rating |
| Searah Limited | London | A rating |
| SEARCE LIMITED | London | A rating |
| Searchlight Capital Partners UK LLP | London | A rating |
| Sears Manufacturing Company (Europe) Ltd | Ebbw Vale | A rating |
| Seatankers Services (UK) LLP | London | A rating |
| Seatec International Ltd | London | A rating |
| SEB | London | A rating |
| Secom Plc | Surrey | A rating |
| Second Front Systems Limited | Maidenhead | A rating |
| Secure Code Warrior Limited | Northampton | A rating |
| Secure Meters (UK) Ltd | Chandlers Ford | A rating |
| Securis Investments Limited | London | A rating |
| Securonix UK Limited | London | A rating |
| Seda UK Limited | Blackwood | A rating |
| SEDAMYL UK LTD | Selby | A rating |
| Sedex Information Exchange Limited | London | A rating |
| Sedgwick International UK | LONDON | A rating |
| Sedna Systems Europe Limited | London | A rating |
| Seedtag Advertising | London | A rating |
| seele UK Ltd | London | A rating |
| SEEQC UK LIMITED | London | A rating |
| SEFE Marketing & Trading Limited | London | A rating |
| SEGA Europe Limited | London | A rating |
| Segregated Payments Ltd | Hatfield | A rating |
| SEI Investments (Europe) Ltd | London | A rating |
| Seibu Prince Hotels Worldwide, Inc. | London | A rating |
| Seismic Software UK Limited | London | A rating |
| Sekisui Diagnostics (UK) Limited | Maidstone | A rating |
| Sela Medical UK LTD | London | A rating |
| Select Equity Group UK Limited | London | A rating |
| Select Property Group Limited | Alderley Edge | A rating |
| Selig UK Limited | Slough | A rating |
| Sella Controls Limited | Ashby De La Zouch | A rating |
| Sellafield Ltd | Seascale | A rating |
| Sembcorp | Middlesbrough | A rating |
| Semco Maritime Limited | Westhill | A rating |
| Semtech Limited | Romsey | A rating |
| SENDIN LTD | London | A rating |
| Seneca Group International UK LTD | London | A rating |
| Senfi UK Limited | Begbroke | A rating |
| Senko Advanced Components (Euro) Ltd | Basingstoke | A rating |
| Senning (UK) Ltd | London | A rating |
| SENOVO IT LTD | LONDON | A rating |
| Sensata Technologies Intermediate UK Limited | Swindon | A rating |
| SENSE BIODETECTION LIMITED | Abingdon | A rating |
| Sensient Flavors Limited | Milton Keynes | A rating |
| Sensium Healthcare Limited | Abingdon | A rating |
| Sensor Tower UK Ltd | London | A rating |
| Sent Entertainment Limited | London | A rating |
| Seoul Money Brokerage Services, Ltd. London Representative Office | London | A rating |
| Seplat Energy UK Limited | London | A rating |
| Sepura Limited | Cambridge | A rating |
| Seqirus UK Limited | Maidenhead | A rating |
| SER SOLUTIONS UNITED KINGDOM LIMITED | London | A rating |
| Sera Global Europe Holdings Limited | London | A rating |
| SERAPID LIMITED | Bury St Edmunds | A rating |
| Serco Ltd t/a Serco Group | Hook | A rating |
| Serendipity Capital UK Services Ltd | London | A rating |
| Serimax ltd | Evanton | A rating |
| Serum Life Sciences Limited | London | A rating |
| Serveo Industria UK Ltd | Ellesmere Port | A rating |
| ServiceNow UK Limited | Staines Upon Thames | A rating |
| ServiceRocket Limited | London | A rating |
| Servier Laboratories Limited | Stoke Poges | A rating |
| Servify UK Limited | Hammersmith | A rating |
| Servomex Group Limited | Crowborough | A rating |
| Servy Technologies UK Limited | London | A rating |
| Setec Consulting Engineers Ltd | Birmingham | A rating |
| Seven Bridges Genomics UK Limited | London | A rating |
| SevenC3 | London | A rating |
| Severfield Commercial & Industrial Limited | Thirsk | A rating |
| SEW EURODRIVE LTD | NORMANTON | A rating |
| Seyfarth Shaw (UK) LLP | London | A rating |
| SFM UK Management LLP | London | A rating |
| SFN Ltd | Milton Keynes, Bucks | A rating |
| SFO Capital Limited | London | A rating |
| SG ANALYTICS LIMITED | London | A rating |
| SGHC UK Limited | London | A rating |
| SGS Hotels (UK) Limited t/a Ramada Solihull | Solihull | A rating |
| SGS United Kingdom Limited | Ellesmere Port | A rating |
| Shachihata (Europe) Ltd | Runcorn | A rating |
| Shaft Drillers U.K. Ltd | Saltburn-by-the-Sea | A rating |
| Shaily Innovations Ltd | Brentford | A rating |
| Shamir UK Limited | Cambridge | A rating |
| Shandon Diagnostics Ltd | Runcorn | A rating |
| Shanghai Commercial Bank Limited | LONDON | A rating |
| Shanghai Electric UK Company Limited | London | A rating |
| Shanghai Foreign Investment Development Board, London Office | London | A rating |
| Shanghai Pudong Development Bank Co., Ltd. | London | A rating |
| Shanghai Stock Exchange London Office | London | A rating |
| Shangri-La Hotels Pte Limited | London | A rating |
| Shapers' Technical Solutions UK Ltd | DROITWICH | A rating |
| ShareThis UK Limited | London | A rating |
| SharkNinja Europe Ltd | Leeds | A rating |
| Sharp Electronics (Europe) Limited | Uxbridge | A rating |
| Sharp Laboratories of Europe Ltd | Oxford | A rating |
| SHARPIST LTD | LONDON | A rating |
| SHAWS SINCE1897 LIMITED | Blackburn | A rating |
| Shearwater Geoservices Limited | Gatwick | A rating |
| Shelbourne Reynolds Engineering Ltd | Bury St. Edmunds | A rating |
| Shelf Drilling (UK), Ltd. | Aberdeen | A rating |
| Shell International Ltd | London | A rating |
| Shenkman Capital Management Ltd | London | A rating |
| Sherwin-Williams UK Limited | Witney | A rating |
| Shield AI UK LTD | London | A rating |
| Shift Technology UK Limited | London | A rating |
| Shilton Sharpe Quarry Limited | London | A rating |
| Shima Seiki Europe Ltd | Derby | A rating |
| Shimadzu Research Laboratory (Europe) Ltd | Manchester | A rating |
| Shimizu Corporation | London | A rating |
| Shin-Etsu Handotai Europe Limited | Livingston | A rating |
| Shinetech Europe Ltd. | London | A rating |
| Shinhan Bank, London B | London | A rating |
| Shinkin International Ltd | London | A rating |
| Shinnyo-en, U.K. | Surrey | A rating |
| Shintoa (UK) Ltd. | Bristol | A rating |
| Shionogi B.V. | London | A rating |
| ShipBob UK Limited | Bristol | A rating |
| Shiseido UK Limited | London | A rating |