| Trading Technologies UK Limited | London | A rating |
| TradingHub Group Limited | London | A rating |
| TradingView Services UK Limited | London | A rating |
| TRADIST LTD | London | A rating |
| Tradition (UK) Limited | London | A rating |
| TRADITIONAL BOUTIQUE KIDS LTD | London | A rating |
| Traditional Massage Ltd | Hounslow | A rating |
| TRADITIONAL SPICE LTD T/A SAKURA INDIAN | SURREY | A rating |
| TRADITIONAL THREADS LIMITED | Bolton | A rating |
| Trafalgar Capital Management Limited | London | A rating |
| Trafalgar Care Limited | Weymouth | A rating |
| Trafalgar Entertainment Group Limited | Godalming | A rating |
| Trafalgar Healthcare Limited | Watford | A rating |
| Trafalgar Investments Limited | London | A rating |
| TRAFALGAR ONE UK LTD | LONDON | A rating |
| Trafalgar Partners Limited | London | A rating |
| Trafalgar Risk Management Ltd. | London | A rating |
| Trafalgar Theatre Productions Limited | London | A rating |
| TRAFFIC International | Cambridge | A rating |
| TRAFFIC SURVEY PARTNERS (TSP) UK LIMITED | London | A rating |
| Traffic Tech U.K Ltd | Surrey | A rating |
| Traffic Technology Ltd | Silverstone | A rating |
| Trafficlenz UK Ltd | Berwick-upon-Tweed | A rating |
| TraffiSafe Limited | Alton | A rating |
| Trafford Domestic Abuse Services | Trafford | A rating |
| Trafford Glass Ltd | Manchester | A rating |
| Trafford Joinery Limited | MANCHESTER | A rating |
| Trafford Windows Manchester Ltd | Manchester | A rating |
| Trafigura | London | A rating |
| TRAFILA Limited | Sutton | A rating |
| Trafix UK Limited | London | A rating |
| Tragopan Security Solutions Ltd | London | A rating |
| TRAICK UK LIMITED | London | A rating |
| Trailblazer Social Care Ltd | Brighouse | A rating |
| Trailer Park Group UK Limited | London | A rating |
| TrailFam | Basildon | A rating |
| Trailmix Limited | London | A rating |
| TrailRunner International UK Limited | London | A rating |
| Train 2 Succeed Academy Limited | Liverpool | A rating |
| TRAIN AIR LTD | North Shields | A rating |
| Train Effective Ltd | London | A rating |
| Train My Athlete Limited | Swindon | A rating |
| Trainbreeze Limited | South Shields | A rating |
| TRAINFX LIMITED | DERBY | A rating |
| Training 212 Limited | Coventry | A rating |
| Training And Employment Services Ltd. | Ilford | A rating |
| Training Lives Ltd | Liverpool | A rating |
| Training The Street UK, LLC ("UK BRANCH") | St Albans | A rating |
| Trainline.com Ltd | London | A rating |
| Trainor Stone and Tile Limited | Belfast | A rating |
| TrainPlus Ltd | Wickford | A rating |
| Trakbak Racing Ltd | Wellingborough | A rating |
| TrakCel Limited | Cardiff | A rating |
| Tralee Ltd t/a Tralee Rest Home | Whitstable | A rating |
| TRAM RETAILS LTD | LANGLEY | A rating |
| TRAM STORES LTD T/A Londis | Ipswich | A rating |
| Trambells Learning Club Ltd | Ilford | A rating |
| Tramontana Asset Management Limited | London | A rating |
| Tramontina United Kingdom Limited | London | A rating |
| Tramp (Jermyn Street) Ltd T/A Tramp | London | A rating |
| Trampoline N.H. C.I.C | London | A rating |
| Trams UK Limited T/A Dosa Express | Manchester | A rating |
| Tran Investments Ltd | Bournemouth | A rating |
| Trandz Builder Ltd | Wednesbury | A rating |
| Trane (UK) Ltd | Basingstoke | A rating |
| Trane UK Limited | Basingstoke | A rating |
| Tranent Mini Market Ltd | Tranent | A rating |
| Trangs UK LTD | LONDON | A rating |
| Tranmere Rovers Football Club | Birkenhead | A rating |
| Tranquility Homes Limited | Leicester | A rating |
| TRANS ASIA ENERGY SERVICES (UK) LTD | Westhill | A rating |
| Trans Global Freight Management Limited | Greenhithe | A rating |
| Trans Global Projects Limited | Kent | A rating |
| Trans Indus Limited | London | A rating |
| Trans Legal Foundation | London | A rating |
| Trans-Continental Marketing Ltd | Coalville | A rating |
| Trans-Fast Remittance (London) Limited | London | A rating |
| TRANS-OCEAN SHIP BROKING CONSULTANCY LTD | London | A rating |
| Transact Technology Solutions Ltd | St Albans | A rating |
| Transaction Network Service UK Limited | Sheffield | A rating |
| Transactworld Limited | London | A rating |
| Transatlantique Private Wealth (UK) Limited | London | A rating |
| Transcal Engineering Limited | Pershore | A rating |
| TRANSCAL LIMITED | LIVINGSTON | A rating |
| Transcard Ltd | London | A rating |
| Transcend Global LTD T/A KITCHEN PLAZA | London | A rating |
| Transcend Healthcare LTD | Luton | A rating |
| Transcend Packaging Ltd | Ystrad Mynach | A rating |
| Transcend Street Solutions UK Limited | London | A rating |
| Transcrip Ltd | Wokingham | A rating |
| Transdermal Diagnostics Ltd | Bristol | A rating |
| TRANSDEV PLC | Keighley | A rating |
| Transense Technologies plc | Bicester | A rating |
| Transfer Rapid Limited | London | A rating |
| TRANSFERFORCE LTD | Borehamwood | A rating |
| TransferGo Ltd | London | A rating |
| Transfermybills.com Ltd | Dunstable | A rating |
| Transferroom Ltd | London | A rating |
| TransferToMobile Financial Services Ltd | London | A rating |
| Transfesa UK Limited | Barking | A rating |
| TRANSFIT WELLNESS LIMITED | Manchester | A rating |
| Transfleet Properties Ltd | Stanmore | A rating |
| TRANSFORM CAREER U.K LIMITED | Birmingham | A rating |
| Transform Housing & Support | Leatherhead | A rating |
| Transform Supported Accommodation LTD | London | A rating |
| Transform Theatre Projects | Leeds | A rating |
| Transform UK Communities LTD | London | A rating |
| Transformacy Group Ltd | Wantage | A rating |
| Transformation Nous Ltd | London | A rating |
| Transformational Energy Limited | Dundee | A rating |
| Transformations Leeds | Leeds | A rating |
| TRANSFORMCX Limited | London | A rating |
| Transformer Systems Ltd | Leeds | A rating |
| Transformers & Rectifiers Limited | Guildford | A rating |
| Transforming Choice CIC | Liverpool | A rating |
| Transforming Lives Co | Dagenham | A rating |
| Transforming Lives Educational Trust | Rugby | A rating |
| Transforming Lives for Good (TLG) | Bradford | A rating |
| Transforming Minds Limited | Gloucester | A rating |
| Transforming Support (Birmingham) Ltd | Birmingham | A rating |
| Transforming Support (Coulsdon) Limited | London | A rating |
| Transforming Support (Liverpool) Ltd | Liverpool | A rating |
| Transforming Support (Peterborough) Ltd | Peterborough | A rating |
| Transforming Support (South London) Ltd | London | A rating |
| Transforming Support (Surrey) Ltd | London | A rating |
| Transforming Support (Sussex) Ltd | Crawley | A rating |
| Transforming Training with Technology Limited | Hurn | A rating |
| Transglobbal Aviation Limited T/A Transglobbal Plumstead - Travel Agent | London | A rating |
| TRANSGLOBE SOLUTIONS LTD | CONNIBURROW | A rating |
| Transgressive Events Ltd | London | A rating |
| Transgressive Management Ltd | London | A rating |
| Transhomes UK Ltd | Hayes | A rating |
| Transilio Equestrian Limited | Glastonbury | A rating |
| Transiris Scotland Ltd | Glasgow | A rating |
| Transis Limited | Stracathro | A rating |
| TRANSITION AND LATERLIFE MATTER | LONDON | A rating |
| Transition Bio Limited | Cambridge | A rating |
| Transition Care Services Ltd | Enfield | A rating |
| Transition Global Management Limited | London | A rating |
| Transitional Care Ltd | Wimbledon | A rating |
| Transitions care (West Midlands) limited | Wolverhampton | A rating |
| TransitionZero | London | A rating |
| Transladiem Ltd | Liverpool | A rating |
| Transladiem Ltd | London, England | A rating |
| TRANSLATE TO LTD | London | A rating |
| TRANSLUCENT LTD | Andover | A rating |
| Transmec UK Ltd | Redditch | A rating |
| Transmedia Storyteller Ltd | London | A rating |
| Transmission (Private) Ltd | London | A rating |
| Transmission Engineering Services Limited | Hebburn | A rating |
| Transmission Excellence Ltd | Kenilworth | A rating |
| Transmission Gallery | Glasgow | A rating |
| Transmission Investment Services Limited | London | A rating |
| Transmission Production Limited | London | A rating |
| TRANSMIT SECURITY UK LTD | Reading | A rating |
| Transocean Onshore Support Services Limited | Kingswells | A rating |
| Transol Logistics Limited | Nuneaton | A rating |
| Transonics PLC | Hemel Hempstead | A rating |
| Transopco UK Ltd | London | A rating |
| Transparency International UK | London | A rating |
| Transparity Solutions Limited | Wimborne | A rating |
| Transperfect Translations Limited | London | A rating |
| Transpetrol UK Services Limited | Liphook | A rating |
| Transpharmation Limited | London | A rating |
| TRANSPORT ETA LTD | LONDON | A rating |
| Transport Exchange Group | London | A rating |
| Transport for London | London | A rating |
| Transport for the North | Manchester | A rating |
| Transport for Wales | Pontypridd | A rating |
| Transport Intelligence Limited | Cambridge | A rating |
| Transport Planning Practice Limited | London | A rating |
| Transport UK London Bus Limited | London | A rating |
| Transportation & Logistics Experts Ltd | Livingston | A rating |
| Transporter Engineering Ltd | Gosfield | A rating |
| TRANSPORTER MK LIMITED | Buckinghamshire | A rating |
| Transportify Limited | Uxbridge | A rating |
| Transports MARI Limited | London | A rating |
| Transputec Limited | Wembley | A rating |
| TransRe London Services Limited | London | A rating |
| TRANSREPORT LIMITED | London | A rating |
| Transtech Solutions Limited | Luton | A rating |
| Transtherm Cooling Industries Limited | Coventry | A rating |
| Transtour Travel Ltd | London | A rating |
| TRANSUNION INFORMATION GROUP LIMITED | Leeds | A rating |
| Transvac Systems Limited | Derbyshire | A rating |
| Transvault Software Limited | Bristol | A rating |
| Transwap Technologies (UK) Limited | Edinburgh | A rating |
| Transworld Business Advisors UK Limited | London | A rating |
| Transworld Engineering Ltd | Cradley Heath | A rating |
| Transylvania Wine LTD | Halifax | A rating |
| TRANT ENGINEERING LTD | SOUTHAMPTON | A rating |
| TRANZCRIPT LIMITED | London | A rating |
| TRANZFAR LTD | London | A rating |
| TranzyPay Limited | London | A rating |
| TRAPEZIUM 777 LIMITED | Kingston upon Thames | A rating |
| TRAPEZIUS HEALTHCARE SERVICES LIMITED | Solihull | A rating |
| Traqcheck Limited | London | A rating |
| TraQs Consulting Limited | Ascot | A rating |
| Tratos Ltd | London | A rating |
| TRAV EXPERT LIMITED | Hounslow | A rating |