| US3 GLOBAL CONSULTING LTD | London | A rating |
| USA BUILDERS LIMITED | Leeds | A rating |
| USAA International Services SARL London Branch | London | A rating |
| USAVE | Bathgate | A rating |
| USAVE EDINBURGH LIMITED T/A USAVE | Edinburgh | A rating |
| USAY1 LTD | LONDON | A rating |
| USB ACCOUNTS LTD | London | A rating |
| Usborne Publishing Limited | London | A rating |
| Usdaw | Manchester | A rating |
| Use Passionfruit Limited | Canterbury | A rating |
| Usedful Limited | Hayes | A rating |
| Useful Simple Group Ltd | London | A rating |
| User Vision | Edinburgh | A rating |
| USERLED.IO LTD | Sevenoaks | A rating |
| USERLY LIMITED | London | A rating |
| UserTesting | Edinburgh | A rating |
| USERTESTING TECHNOLOGIES LIMITED. | London | A rating |
| USG-Gledco Limited | Leeds | A rating |
| Usha Martin UK LIMITED | Nottinghamshire | A rating |
| Ushodaya Services Ltd | Milton Keynes | A rating |
| USK AUTOMOTIVE LTD | Sandy | A rating |
| USM U. SCHAERER SONS LIMITED | London | A rating |
| USMAC UK Limited | Milton Keynes | A rating |
| USMAN ALI JEWELLERY TRADING UK LTD | Southall | A rating |
| USMAN BEDS BOLTON LTD T/A USMAN BEDS | Bolton | A rating |
| Usman Brothers Ltd | Dudley | A rating |
| Usman Business Ltd | Darlaston | A rating |
| Usman Fayyaz Khan T/A Independent Financial Advisor | Slough | A rating |
| Usman Gas Solutions Ltd | Dudley | A rating |
| Usman Ice Cream Ltd T/A Baskin Robbins | Edinburgh | A rating |
| USMAN SUPERMARKET LTD | London | A rating |
| Usman's Supermarket | Sheffield | A rating |
| Usmani Mosque | Leicester | A rating |
| USMANINAGAR LIMITED TA The Miah Restaurant | B79 7PA | A rating |
| USN UK Ltd | Longbridge | A rating |
| Usnoop Ltd | London | A rating |
| USOFT LIMITED | Birmingham | A rating |
| USP College | Benfleet | A rating |
| USPCA | Newry | A rating |
| USPG | London | A rating |
| USPHOTOGRAPHY LTD | Abertawe | A rating |
| USS TECHNOLOGIES LIMITED | Slough | A rating |
| USSR STAR TRADING LTD | Bolton | A rating |
| USSTAD HAULAGE LTD | Wolverhamton | A rating |
| UST (GLOBAL) PRIVATE LIMITED | London | A rating |
| UST Healthproof Holdings (UK) Private Ltd | LONDON | A rating |
| Ustad Kitchens Ltd T/A Biryani and Burgers | London | A rating |
| USTAY GLOBAL LTD | Manchester | A rating |
| USTM LIMITED | Leicester | A rating |
| Ustwo Games Ltd | London | A rating |
| USTWO LIMITED | London | A rating |
| USWAT WELFARE TRUST LIMITED | LONDON | A rating |
| uSwitch Limited | London | A rating |
| UTAX (UK) Limited | Swindon | A rating |
| UTC Artist Management Limited | London | A rating |
| UTEA DEPTFORD LTD | London | A rating |
| Utex Europe Limited | Ashington | A rating |
| UTH UK LIMITED | Bristol | A rating |
| Uthaya(uk) Ltd | Middlesbrough | A rating |
| Uthayabalan Sivanadiyar T/AS PALACE MINIMART | Upper Norwood | A rating |
| UTHAYAN FOOD AND WINE LIMITED | Eastham | A rating |
| UTILIDEX LTD | LONDON | A rating |
| Utilita Energy Limited | Chandlers Ford | A rating |
| UTILITIES XPERTS LIMITED | Walton-On-Thames | A rating |
| Utility Aid Limited | Sleaford | A rating |
| Utility Bidder LTD | Corby | A rating |
| Utility Consultancy and Engineering Limited | Barnsley | A rating |
| UTILITY DATA INTELLIGENCE LTD | London | A rating |
| Utility France Limited | SALFORD | A rating |
| Utility ROV Services Limited | Glenrothes | A rating |
| UTILITY SAVING SOLUTIONS LIMITED | Rochdale | A rating |
| Utility Savings Ltd | Bradford | A rating |
| Utilligence Ltd | Haywards Heath | A rating |
| UTIX LTD | London | A rating |
| Utley Fisheries Ltd | Utley | A rating |
| UTM CONSULTANTS LTD | Bristol | A rating |
| Utmost International Group Holdings Limited | London | A rating |
| Utmost Life and Pensions Limited | Aylesbury | A rating |
| UTMOSTCARE LIMITED | AYLESBURY | A rating |
| Utophee LTD | Chelmsford | A rating |
| Utopia Capital Management Limited | London | A rating |
| Utopia Care Limited | Thetford | A rating |
| Utopia Crafts Ltd | Exeter | A rating |
| Utopia Deals Ltd | Derby | A rating |
| Utopia Desserts LTD | Fareham | A rating |
| Utopia Food Ltd | London | A rating |
| UTP Merchant Services | Reading | A rating |
| Utranazz Importers & Exporters Ltd | Piddington | A rating |
| UTSD LIMITED | BRISTOL | A rating |
| UTTAM JI & SONS LIMITED | READING | A rating |
| Utter Waffle | London | A rating |
| Uttoxeter and District Old Peoples Housing Society Ltd. | Uttoxeter | A rating |
| Uttoxeter Much Ltd | Stoke-On-Trent | A rating |
| UUNITED HOME IMPROVEMENTS LTD | Nottingham | A rating |
| Uurnik Systems Ltd | Reading | A rating |
| UV PHOTOGRAPHY LTD | Maidstone | A rating |
| UV Software Limited | Cambridge | A rating |
| UV-TECHNIK INTERNATIONAL LIMITED | Caddington | A rating |
| UVD LTD | West Bromwich | A rating |
| UVeye UK LIMITED | London | A rating |
| UVK TRADING LTD | LEICESTER | A rating |
| UVS Law Limited | Burton-upon-Trent | A rating |
| uVue Ltd | Cambridge | A rating |
| Uwagboe's Kitchen & Grill Ltd | Edinburgh | A rating |
| Uway Global (UK) Ltd | London | A rating |
| UWE Houses LLP | Bristol | A rating |
| UX Connections Ltd | London | A rating |
| UXBRIDGE CRICKET CLUB | UXBRIDGE | A rating |
| Uxbridge High School Academy Trust | Uxbridge | A rating |
| Uxbridge Restaurant Ltd | London | A rating |
| Uxbridge Scooters Limited | Uxbridge | A rating |
| Uxbridge Specsavers Hearcare Limited | Uxbridge | A rating |
| UXV HOLDINGS LIMITED | Manchester | A rating |
| UY Accountants Ltd | Harrow | A rating |
| UYCCC t/a Giovannis Restaurant | Cardiff | A rating |
| UYGUR LIMITED | LONDON | A rating |
| UZ Traders Ltd | Nottingham | A rating |
| UZAIR NORTH 1 LTD T/A Mobile Doctor Ayr | Ayr | A rating |
| UZBEK CORNER LTD | London | A rating |
| Uzbekistan Airways | London | A rating |
| UZMA BEAUTY LTD | Slough | A rating |
| Uzumaki Ltd | London | A rating |