| Swellfix UK Ltd | Westhill | A rating |
| SWIDCH LIMITED | London | A rating |
| Swietelsky Construction Company Ltd | Reading | A rating |
| SWIM.AI Ltd | Cheltenham | A rating |
| SWIMLANE UK LTD | Cheltenham | A rating |
| Swindon Silicon Systems Limited | Royal Wootton Basset | A rating |
| Swingers 1 Ltd | London | A rating |
| Swinkels Family Brewers UK Ltd | Tutbury | A rating |
| SWIRE RENEWABLE ENERGY LIMITED | London | A rating |
| Swiss Re Services Ltd | London | A rating |
| Swisslog (UK) Ltd | Redditch | A rating |
| Swissport GB Limited | Runcorn | A rating |
| Switch Mobility Limited | Rotherham | A rating |
| Switzerland Tourism | London | A rating |
| Swooshtransfer Ltd | London | A rating |
| Sword Technology Solutions Limited | Staines | A rating |
| SX Group Holding UK Limited | London | A rating |
| SXSW London Limited | London | A rating |
| Sydell London Ltd | London | A rating |
| Syensqo Solutions UK Limited | Oldbury | A rating |
| Syft Online Limited t/a Syft | London | A rating |
| Sygnia Consulting UK Limited | London | A rating |
| Sykes Seafood Limited | Knutsford | A rating |
| Symbiotics(UK) Ltd | London | A rating |
| Symbolica AI Limited | London | A rating |
| Symfos Limited | London | A rating |
| Symmetry Investments UK LLP | London | A rating |
| Symogen Limited | Marlow | A rating |
| Symphony Communication Services UK Limited | London | A rating |
| Symphony Ventures Ltd | London | A rating |
| Symprove Ltd | Farnham | A rating |
| SYMRISE LIMITED | Marlow | A rating |
| Synack Europe Limited | Cheltenham | A rating |
| Synacor Europe Limited | London | A rating |
| Synamedia Limited | Maidenhead | A rating |
| Syndigo UK Ltd | London | A rating |
| Synechron Limited | London | A rating |
| Synechron Solutions Limited | London | A rating |
| Syneos Health UK Limited | Farnborough | A rating |
| Synergy Associates Ltd | LONDON | A rating |
| SYNERGY FLAVOURS LTD | HIGH WYCOMBE | A rating |
| Synergy Hire Limited | Letchworth | A rating |
| Synexa Life Sciences | Macclesfield | A rating |
| Syngenta Limited | Berkshire | A rating |
| Synology UK Ltd | Milton Keynes | A rating |
| Synopsys (Northern Europe) Ltd | Reading | A rating |
| Synpulse UK Ltd | London | A rating |
| Syntasa UK Limited | London | A rating |
| Syntel Europe Limited | London | A rating |
| Synthesis Systems Limited | London | A rating |
| Synthomer plc | Harlow | A rating |
| Syracuse University London Program | London | A rating |
| SYSDIG LTD | London | A rating |
| Sysdoc Limited | London | A rating |
| SYSPRO GLOBAL SOFTWARE LIMITED | London | A rating |
| System ltd | Milton Keynes | A rating |
| System1 Group PLC | London | A rating |
| Systematic Software Engineering Limited | Farnborough | A rating |
| SystemiQ Limited | London | A rating |
| Systems Planning and Analysis UK Limited | Bristol | A rating |
| SystemsAccountants Limited | Fotheringhay | A rating |
| SYSTRA Ltd | London | A rating |
| T & L Sugars Limited | London | A rating |
| T & S ENTERPRISES (LONDON) LIMITED | Hove | A rating |
| T Rowe Price International Ltd | London | A rating |
| T-Systems Ltd | Milton Keynes | A rating |
| T.C.ZIRAAT BANKASI A.S. | LONDON | A rating |
| T.EN E&C Limited | London | A rating |
| T.O.G. (UK) Limited | London | A rating |
| T&K EURO TRADING LIMITED | London | A rating |
| TA Associates (UK) LLP | London | A rating |
| Tabacalera SLU | London | A rating |
| Taboola Europe Limited | London | A rating |
| Taconic Capital Advisors UK LLP | London | A rating |
| TAE Power Solutions Limited | Bickenhall, Solihull | A rating |
| TAFE Advanced AG Solutions Ltd | Newport | A rating |
| TAG EUROPE LTD | London | A rating |
| Tages Capital LLP | London | A rating |
| Taihan UK Branch Office | Teddington | A rating |
| Tait Europe Limited | Swavesey | A rating |
| Taiwan Trade Centre Limited | London | A rating |
| Takara Belmont (UK) Limited | Bow | A rating |
| TAKARA SHUZO INTERNATIONAL CO., LTD. | Inverness | A rating |
| Take-Two Interactive Software Europe Limited | London | A rating |
| Takeda UK Limited | London | A rating |
| Takenaka Europe GmbH UK Branch | London | A rating |
| Takeuchi Mfg UK Ltd | Rochdale | A rating |
| Takram Ltd | London | A rating |
| Tala Energy Ltd | London | A rating |
| Talent AcquisitionCo UK Limited | London | A rating |
| Talisman Colombia Holdco Limited | Manchester | A rating |
| Talogy Limited | Guildford | A rating |
| Talon Outdoor Limited | London | A rating |
| Tama U.K. Limited | Alton | A rating |
| Tamr, Ltd | Greater London | A rating |
| TANABE PHARMA EUROPE LTD | LONDON | A rating |
| TANGENCY CAPITAL SERVICES LTD | London | A rating |
| Tangoe Europe Limited | London | A rating |
| Tanium UK Limited | Reading | A rating |
| Tankers (UK) Agencies Limited | London | A rating |
| Tanner Pharma UK Limited | St Albans | A rating |
| TAP Advisors Ltd. | London | A rating |
| Tapeta Footings, Ltd. | Crook | A rating |
| TAPI UK LTD | London | A rating |
| Taptap Send UK Ltd. | London | A rating |
| Tarantula.Net Limited | Newbury | A rating |
| Tareo UK Limited | Colchester | A rating |
| TARI GLOBAL | London | A rating |
| Tarkett Limited | Ashford | A rating |
| Tarmac Trading Limited | Solihull | A rating |
| TASAKI UK LTD. | LONDON | A rating |
| TaskRabbit Limited | London | A rating |
| Tasman Group Limited | London | A rating |
| Taster Food UK Limited | London | A rating |
| Tata Chemicals Europe Limited | Northwich | A rating |
| TATA Communications (UK) Limited | London | A rating |
| Tata Consultancy Services | London | A rating |
| TATA Consulting Engineers Limited | London | A rating |
| Tata Consumer Products GB Limited | Greenford | A rating |
| TATA ELXSI LTD | LONDON | A rating |
| Tata International West Asia DMCC Rep Office | London | A rating |
| Tata Limited | London | A rating |
| Tata Motors Design Tech Centre PLC | Coventry | A rating |
| Tata Steel UK Limited | Port Talbot | A rating |
| Tata Technologies Europe Limited | Warwick | A rating |
| Tate & Lyle PLC | London | A rating |
| Tavant Technologies Private Limited | Nottingham | A rating |
| Tavus AI Ltd | Cheltenham | A rating |
| Taylor Hopkinson Limited | Glasgow | A rating |
| Taylor Made Golf Limited | Basingstoke | A rating |
| TAZAKI FOODS LTD | ENFIELD | A rating |
| TBC Bank Group PLC | London | A rating |
| TBS London (Tokyo Broadcasting System Inc.) | London | A rating |
| TCW Europe Limited | London | A rating |
| TD Williamson (UK) Limited | Swindon | A rating |
| TDK - Lambda UK Limited | Ilfracombe | A rating |
| TDK UK Limited | Bracknell | A rating |
| Teach for All Network | London | A rating |
| Teacher Retirement Investment Company of Texas Limited | London | A rating |
| Teacher Retirement Investment Company of Texas Ltd | London | A rating |
| Teacher Services English One Ltd | London | A rating |
| Teads Ltd | London | A rating |
| Tealium Limited | Reading | A rating |
| Team Industrial Services (UK) Limited | Kendal | A rating |
| TEAM Marketing UK Ltd | London | A rating |
| Team Montage UK Ltd | Widnes | A rating |
| Teamwill Consulting UK Limited | London | A rating |
| Teamwork Commerce Limited | London | A rating |
| Teamworks Innovations UK Limited | London | A rating |
| Tearfund | Teddington | A rating |
| TECH ENABLED MARKETING LTD (Trading name: ZYXWARE TECHNOLOGIES) | London | A rating |
| Tech Mahindra Limited | Milton keynes | A rating |
| TechInsights Market Analysis Limited | Milton Keynes | A rating |
| Techlabs London Ltd | High Wycombe | A rating |
| Techneplus UK Limited | Romford | A rating |
| Technetix Ltd | Albourne | A rating |
| Technia Limited | Milton Keynes | A rating |
| Technical Absorbents Limited | Grimsby | A rating |
| Technicolor | London | A rating |
| TechnipFMC UK Limited | Aberdeen | A rating |
| Technogym U.K. Limited | Bracknell | A rating |
| Technology Blueprint Ltd | Cambridge | A rating |
| Technology Crossover Ventures UK, LLP | London | A rating |
| Technology Holdings Worldwide Limited | London | A rating |
| TechnologyOne UK Limited | London | A rating |
| Technosoft Engineering UK Ltd | Manchester | A rating |
| TECHNOSSUS (UK) LTD | DARTFORD | A rating |
| TechTarget Ltd. | London | A rating |
| Techtopay | London | A rating |
| Techtronic Industries EMEA Ltd | Maidenhead | A rating |
| TechWolf Limited | London | A rating |
| Teck Resources (UK) Ltd | London | A rating |
| Tecozam United Kingdom Limited | Cardiff | A rating |
| Teecom Consulting Limited | Altrincham | A rating |
| Teekay Shipping (UK) Limited | London | A rating |
| Teignbridge Propellers International Ltd | Newton Abbot | A rating |
| Teikyo Foundation (UK) | Wexham | A rating |
| TEIKYO UNIVERSITY OF JAPAN IN DURHAM | DURHAM | A rating |
| Tejara Capital Limited | LONDON | A rating |
| Tekever Limited | Southampton | A rating |
| Tekion UK Limited | London | A rating |
| TEKNERA Ltd | London | A rating |
| Teknicor UK Limited | London | A rating |
| Teksan UK Ltd | Birmingham | A rating |
| Tektome Ltd | London | A rating |
| Tektronix UK Limited | Bracknell | A rating |
| Teledyne UK Limited | Chelmsford | A rating |
| Telefonica Digital Limited | London | A rating |
| Telefonica Tech UK Limited | London | A rating |
| Teleglobal Consulting LTD | Swindon | A rating |
| Telegraph Publishing Limited | London | A rating |
| Telekom Malaysia (UK) Limited | London | A rating |
| Teleperformance Contact Limited | Bristol | A rating |
| TELEPERFORMANCE GLOBAL BPO UK LIMITED | LONDON | A rating |
| Teleperformance Limited | Bristol | A rating |
| Telespazio UK Ltd | Luton | A rating |
| Teletrac Navman (UK) Ltd | Milton Keynes | A rating |
| TeleTracking International Limited | London | A rating |
| Teligent Limited | Theale | A rating |
| Telkes Desarrollos Energeticos UK Ltd | London | A rating |