| United Construction and Remodeling Ltd | New Malden | A rating |
| United Construction London Limited | Southall | A rating |
| United Constructions Mcr | Manchester | A rating |
| United Continental Foods Limited | Nottingham | A rating |
| United Derby Transport Ltd | Derby | A rating |
| United Diesel Fuel Injection Services Limited | Shrewsbury | A rating |
| United Engineering and Contracting Ltd | Coventry | A rating |
| UNITED EUROPE LOGISTIC LIMITED | Cardiff | A rating |
| UNITED EVALAUTION LTD | Manchester | A rating |
| United Exports (Pty) Limited | London | A rating |
| UNITED EXPRESS GLOBAL LTD | BIRMINGHAM | A rating |
| United Facilities Support Services Ltd | London | A rating |
| United Fintech Limited | London | A rating |
| United Food Brands Ltd | Aldershot | A rating |
| United Food Ingredients Ltd | Bury St. Edmunds | A rating |
| UNITED FOOD SERVICES LIMITED | Stockport | A rating |
| United Foods (S. Wales) Ltd | Newport | A rating |
| United Foods Cash and Carry | Bradford | A rating |
| United for the Gospel - Europe | Cambridge | A rating |
| United Foreign Education Consultancy Ltd | London | A rating |
| United Fostering Services Limited | Coventry | A rating |
| United Freight Services Limited | London | A rating |
| United Fruit Growers Limited | Maidstone | A rating |
| United Furniture (AB) Limited | Burnley | A rating |
| United Gas and Power | Leeds | A rating |
| UNITED GAS ENGINEERING LTD | Ruddington | A rating |
| UNITED GLOBAL PARTNERS LTD | LONDON | A rating |
| United Grand Lodge of England | London | A rating |
| UNITED HEALTHCARE GROUP LTD | LEICESTER | A rating |
| United Help Limited | Leicester | A rating |
| United Infrastructure Management Limited | Warrington | A rating |
| United Insurance Brokers Limited | London | A rating |
| United International Piping UK Limited | Coventry | A rating |
| United IT and Consultancy Limited | London | A rating |
| United Jewish Israel Appeal | London | A rating |
| UNITED KARS LTD | London | A rating |
| UNITED KINGDOM & EUROPE WORLD LITERACY FOUNDATION | London | A rating |
| United Kingdom Atomic Energy Authority | Abingdon | A rating |
| UNITED KINGDOM COURIER SAME DAY LIMITED | Manchester | A rating |
| United Kingdom for UNHCR, | London | A rating |
| United Kingdom Haemophilia Centre Doctor's Organisation | Salford | A rating |
| United Kingdom Mennonite Ministries | Craven Arms | A rating |
| United Kingdom National Nuclear Laboratory | Warrington | A rating |
| UNITED KOCHI LTD | Swindon | A rating |
| United Legal Services Limited | Thame | A rating |
| UNITED LIFE | NORTHAMPTONSHIRE | A rating |
| United Life Chapel | Coventry | A rating |
| United Lincolnshire Hospitals NHS Trust | Lincoln | A rating |
| United Living North | Widnes | A rating |
| United Living South Limited | Swanely | A rating |
| United Looks Limited | Uxbridge | A rating |
| UNITED MANAGEMENT (PDA) LIMITED | LONDON | A rating |
| UNITED MANAGEMENT (UK) LTD | MANCHESTER | A rating |
| United Med LTD | Surbiton | A rating |
| United Medical Hospital System Limited | London | A rating |
| United Methodist Church (UK) | Leicester | A rating |
| United Mice Travel Service UK Ltd | London | A rating |
| United Minibuses and Coaches Limited | Surrey | A rating |
| United Mining Services Ltd | London | A rating |
| United Molasses Group Limited | Belfast | A rating |
| UNITED MOTORS MANCHESTER LTD | Stockport | A rating |
| United National Bank Limited | London | A rating |
| United Nepali Revival Church | Wembley | A rating |
| United Overseas Bank Ltd | London | A rating |
| United Pentecostal Church of Great Britain & Ireland | London | A rating |
| United People Church | London | A rating |
| United Performance Metals Ltd | Newtownards | A rating |
| UNITED PETFOOD UK LIMITED | Llangadog | A rating |
| United Reformed Church | London | A rating |
| United Registrar Of Systems | Bournemouth | A rating |
| United Repairs Ltd | Feltham | A rating |
| United Response | Croydon | A rating |
| UNITED RESTAURANT SW19 LTD | LONDON | A rating |
| United Retail & Sourcing Limited | London | A rating |
| United Risk International Holdings Ltd | London | A rating |
| United Shield International Limited | Hampshire | A rating |
| UNITED SIKHS | Wolverhampton | A rating |
| United Solicitors | Manchester | A rating |
| United Sourcing LTD | Essex | A rating |
| United Strategies International Limited | Chester | A rating |
| United Supermarket | Bristol | A rating |
| United Synagogue | London | A rating |
| United Talent Agency UK Operations Ltd T/A United Talent Agency | London | A rating |
| United Technologists Europe Limited | Hadleigh | A rating |
| UNITED THERAPEUTICS EUROPE, LTD. | Duxford | A rating |
| United Travels Reading Ltd | Reading | A rating |
| UNITED TRENDS LIMITED T/A LIFESTYLE EXPRESS | Birmingham | A rating |
| United Trust Bank Limited | London | A rating |
| United Tyre Company Limited | Newport | A rating |
| UNITED UK VISION LTD | Luton | A rating |
| United Utilities PLC | Warrington | A rating |
| UNITED VISION LTD | London | A rating |
| United Voices of the World | London | A rating |
| United Waste Oil Limited | London | A rating |
| United Wholesale (Scotland) Limited | Glasgow | A rating |
| United Wholesale Grocers Limited | Glasgow | A rating |
| United World College of the Atlantic Ltd | Llantwit Major | A rating |
| United World Schools | London | A rating |
| UNITED-FM LIMITED | London | A rating |
| United-Rotating UK Ltd | Exeter | A rating |
| Unitedgrids Ltd. | Elstree | A rating |
| UNITEDLEX LIMITED | LONDON | A rating |
| UnitedUs Ltd | Brighton | A rating |
| UNITEK ASSOCIATES LIMITED | HOUNSLOW | A rating |
| Uniteq Limited | Gravesend | A rating |
| UNITING CARE LTD | Bolton | A rating |
| Unitive Technologies Limited | London | A rating |
| Unitrove Innovation Limited | Loughborough | A rating |
| Unitrust protection services | Wembley | A rating |
| UNITSPARK LIMITED | Reading | A rating |
| Unity Advisory Opco 2 Limited | Fareham | A rating |
| Unity Cash and Carry Limited | Salford | A rating |
| UNITY DISTRIBUTION LTD | Walsall | A rating |
| Unity Education Trust | DEREHAM | A rating |
| Unity Enterprise (Bristol) Ltd | Bristol | A rating |
| Unity Fire Safety Limited | London | A rating |
| Unity for Integration Project | Glasgow | A rating |
| Unity Health Care Solutions Ltd | Hexham | A rating |
| Unity Healthcare UK Limited | Sutton | A rating |
| Unity Homes Limited | Salford | B rating |
| UNITY HOUSING SUPPORT | Leicester | A rating |
| Unity Insights Limited | Crawley | A rating |
| Unity Link Financial Services Limited | London | A rating |
| Unity Media Midlands Limited | Leicester | A rating |
| Unity One Care Solution Ltd | London | A rating |
| Unity Schools Partnership | Haverhill | A rating |
| Unity Schools Trust | Staines | A rating |
| Unity Software Limited | Brighton | A rating |
| Unity Well Integrity UK Limited | Aberdeen | A rating |
| UNITY'S A&R TRANSPORT LTD | SOUTHALL | A rating |
| Unityone Ltd | Birmingham | A rating |
| Univeristy of St Andrews Students' Association | St Andrews | A rating |
| UNIVERON TECHNOLOGIES LIMITED | Luton | A rating |
| UNIVERS FURNITURE LTD | Birmingham | A rating |
| Univers U.K. LTD | London | A rating |
| UNIVERSAL ACCOUNTANTS | DERBY | A rating |
| Universal Accounts Ltd | London | A rating |
| UNIVERSAL AIR EXPRESS LTD | Hayes | A rating |
| Universal Bakers | Peterborough | A rating |
| Universal Balancing | Bristol | A rating |
| UNIVERSAL BARGAIN LTD | Salford | A rating |
| Universal Bodyshop UK Limited | Nuneaton | A rating |
| UNIVERSAL BRANDING LTD | Wolverhampton | A rating |
| UNIVERSAL CABS LTD | Ipswich | A rating |
| Universal care and nursing 247 Limited | Ilford | A rating |
| Universal Carpets & Flooring (Midlands) Ltd | Walsall | A rating |
| Universal Cars Ltd | London | A rating |
| Universal Catering Ltd T/as Eat Meat Restaurant | Bolton | A rating |
| Universal Clutches Ltd | Luton | A rating |
| Universal Components UK Limited | Barnsley | A rating |
| Universal Conceirge Services LTD | London | A rating |
| UNIVERSAL CONSULTANCY GLOBAL LIMITED | Manchester | A rating |
| UNIVERSAL CONSULTANTS AND ASSET MANAGEMENT LIMITED | London | A rating |
| Universal Control Equipment Ltd | Ipswich | A rating |
| Universal Courier Logistical Services Ltd | Willenhall | A rating |
| Universal Day Care Limited T/A Universal Day Care Centre | Wednesbury | A rating |
| Universal Delivery Solutions Limited | Heston | A rating |
| Universal Design Studio Limited | London | A rating |
| Universal Dispense Systems Ltd | Hounslow | A rating |
| Universal Distribution Ltd | Slough | A rating |
| UNIVERSAL EDUCATION CARE LTD | London | A rating |
| UNIVERSAL ELECTRONICS LIMITED | Essex | A rating |
| Universal Express Distribution Ltd | Isleworth | A rating |
| Universal Express Services Ltd | Wembley | A rating |
| Universal Fabrication & Shop Front Limited | London | A rating |
| Universal Fabrications (Coventry) Ltd | Nuneaton | A rating |
| Universal Flexible Packaging Limited | Leicester | A rating |
| Universal Food Supplier Ltd | London | A rating |
| Universal Food Supplies Limited | Portsmouth | A rating |
| UNIVERSAL FOODS STOKE LIMITED | NEWCASTLE | A rating |
| Universal Foodz LTD T/A Varadon Japanese T/A Far East Kitchen | London | A rating |
| Universal Fortune Limited | London | A rating |
| UNIVERSAL GARMENTS INTERNATIONAL LIMITED | Glossop | A rating |
| UNIVERSAL HEATING & PLUMBING LIMITED | Hayes | A rating |
| Universal House Wentworth Street LLP | London | A rating |
| UNIVERSAL IMPORT EXPORT UK LTD | SOUTHALL | A rating |
| Universal Liquor Mart (London) Ltd | London | A rating |
| Universal Maintenance Services Limited | Enfield | A rating |
| UNIVERSAL MAKERS LTD | DAGENHAM | A rating |
| Universal Matter GBR Ltd | Redcar | A rating |
| Universal Music Operations Ltd | London | A rating |
| Universal Music Operations Ltd. | London | A rating |
| Universal Music Publishing Ltd. | London | A rating |
| UNIVERSAL OFFICE EQUIPMENT (UK) LIMITED | London | A rating |
| Universal Partners FX Limited | Canary Wharf | A rating |
| UNIVERSAL PARTS UK LIMITED | LONDON | A rating |
| Universal Paving | Derby | A rating |
| Universal Pentecostal Church | Brixton | A rating |
| Universal Prayer Group Ministry | LONDON | A rating |
| Universal Prayer Group Ministry | Welling | A rating |
| Universal Productions Limited | Gateshead | A rating |
| Universal Quantum | Brighton | A rating |
| UNIVERSAL SAVIOUR LIMITED | Leicester | A rating |
| Universal Scotland Ltd | Glasgow | A rating |
| Universal Securities and Investments Limited | London | A rating |
| UNIVERSAL SERVICES GROUP LTD | London | A rating |
| UNIVERSAL SERVICES LONDON LIMITED | london | A rating |
| Universal Services Trading Ltd | Sutton Coldfield | A rating |
| UNIVERSAL SUPERMARKET LTD | Dundee | A rating |
| Universal Suppliers Ltd | Wembley | A rating |