| TXO Systems Ltd | Chepstow | A rating |
| TXOdds (UK) Limited | London | A rating |
| TXT Next Limited | Stockton-on-Tees | A rating |
| TY 24 LTD | Bradford | A rating |
| Ty Caredig Support Living | Bridgend | A rating |
| TY DANJUMA FAMILY OFFICE LIMITED | ESHER | A rating |
| Ty Derlwyn Ltd | Abergavenny | A rating |
| TY DERWEN LTD | Cardiff | A rating |
| Ty Draw Lodge | Penylan | A rating |
| TY GWYN D.P LIMITED | Swansea | A rating |
| Ty Hafod Ltd | Cardiff | A rating |
| Ty Mawr Nursing Home | Swansea | A rating |
| Tyche Consulting Ltd | London | A rating |
| TYCHE STORE LIMITED | London | A rating |
| TYCHE UK OFFICE LTD | NEW MALDEN | A rating |
| Tychon Installations Ltd | London | A rating |
| Tyco Electronics UK Ltd | Swindon | A rating |
| Tycoon Corporations Ltd | Smethwick | A rating |
| TYCROES SUPERMARKET LTD | West Glamorgan | A rating |
| TYDAIMAGES LIMITED | Hull | A rating |
| TYDDYN LLAN LIMITED | Denbighshier | A rating |
| Tydene Limited | London | A rating |
| Tyerest Limited | KENTON | A rating |
| Tyfer Networks Ltd | Enniskillen | A rating |
| TYG Trading Ltd | Glasgow | A rating |
| TYGA Restaurant & Bar | Manchester | A rating |
| TYGER HOLDINGS LTD | London | A rating |
| TYGO RETAIL LTD T/A Today's Extra | Grimsby | A rating |
| TYK Limited | Chilton | A rating |
| Tyler Capital Ltd | London | A rating |
| Tyler Crown and Bridge Ltd | Gloucester | A rating |
| Tyler Hill Consulting Limited | London | A rating |
| Tylers Consultancy Limited | Basingstoke | A rating |
| TYLI Ltd | Chelmsford | A rating |
| Tylorstown Convenience Store | Fernsdale | A rating |
| Tylos Logistics Limited | Milton Keynes | A rating |
| TYM Traders Ltd | Manningtree | A rating |
| Tymit LTD. | London | A rating |
| Tymphany Acoustic Technology (UK) Limited | Bridgend | A rating |
| TYMZ FOOD LTD | Rochester | A rating |
| Tynan Surgery | Armagh | A rating |
| Tyndale House and Institute | Cambridge | A rating |
| TYNE & WEAR CARE SERVICES LTD | Gateshead | A rating |
| Tyne Coast College | South Shields | A rating |
| Tyne Gangway (Structures) Ltd | Newcastle Upon Tyne | A rating |
| Tyne Trading LLP | Byker | A rating |
| Tynedale Guest House LTD | Penrith | A rating |
| Tynedale Sports Club incorporating Tynedale Cricket Club | Hexham | A rating |
| Tynefield Care Ltd T/A Tynefield Court | Derby | A rating |
| Tynemouth Cricket Club | North Shields | A rating |
| Tynemouth Medical Practice | London | A rating |
| TYNESIDE FLEET LIMITED | Newcastle Upon Tyne | A rating |
| Tyneside Surgical Services | Gateshead | A rating |
| Tyneside Vineyard (also known as Life Vineyard Church) | Wallsend | A rating |
| Tynwald | Hythe | A rating |
| Typeform UK Limited | London | A rating |
| TYPING'S COOL LTD | Kingston Upon Thames | A rating |
| TYPSA Limited | London | A rating |
| TYRE BUDDY LIMITED | Reading | A rating |
| Tyre Centre Direct Ltd | Sutton Coldfield | A rating |
| TYRE CENTRE PLUS LTD | Ruislip | A rating |
| Tyre Place Limited | Uxbridge | A rating |
| Tyre Safety Centre (Co.Tyrone) Limited | Cookstown | A rating |
| TYRE TRAX (BRADFORD LTD) | BRADFORD | A rating |
| TYRE99 LTD | Cannock | A rating |
| TYRES B WISE (SCOT) LTD | GLASGOW | A rating |
| Tyres Today (GB) Limited | Bolton | A rating |
| Tyres World Limited | Bolton | A rating |
| Tyresonline Ltd T/AS Sil Tyres | Birmingham | A rating |
| Tyrewise Bolton LTD | Bolton | A rating |
| Tyringham Care Ltd | Milton Keynes | A rating |
| Tyrion Construction and Development Company Ltd | Beaconsfield | A rating |
| Tyrion Security Bidco Limited | Oldham | A rating |
| Tyrocircle Ltd | London | A rating |
| Tyrolean Adventures Limited | Chippenham | A rating |
| Tyrone Formwork Limited | Dungannon | A rating |
| Tyrone Trailers Ltd | Coalisland | A rating |
| Tyrrell Products Limited | Lancashire | A rating |
| Tyrrells Equine Clinic Ltd | Royston | A rating |
| TYRUS TECH LTD | Tyne | A rating |
| TYS RETAIL LTD T/A Nisa Local | Peterborough | A rating |
| Tysers Insurance Brokers Ltd | London | A rating |
| Tysew Limited | Iver | A rating |
| Tyson Foods Products Limited | Ashford | A rating |
| Tyson International Service Center, Inc. Europe | Chiswick | A rating |
| Tyson Mini Market | Forest Hill | A rating |
| TYSR LEISURE LTD T/A CAFE BOHO | Cheltenham | A rating |
| Tytan PG Limited | Gloucester | A rating |
| Tythings Store | Newent | A rating |
| TYTN Ltd | London | A rating |
| TYTN LTD | 1 Concorde Way | A rating |
| Tyviso Ltd | London | A rating |
| Tzolkin Limited | London | A rating |
| TZSK Second Ltd | Crewe | A rating |
| TZSK Third Ltd | High Wycombe | A rating |