| Worldwide Flight Services Limited | London | A rating |
| Worldwide Foods (Rochdale) Limited | Rochdale | A rating |
| Worldwide Freight Logistics Ltd | London | A rating |
| Worldwide Furniture London Limited | London | A rating |
| Worldwide Global Brands Ltd | London | A rating |
| Worldwide Immigration | Farnborough | A rating |
| Worldwide Production Agency | London | A rating |
| Worldwide Solutions Group Limited | Luton | A rating |
| Worldwide TechServices UK Ltd | Windsor | A rating |
| Worldwide Tradelink Ltd | West Lothian | A rating |
| Worldwide Travel LTD | Wolverhampton | A rating |
| Worldwide Veterinary Service | Cranborne | A rating |
| Worldwide Waste Management Ltd | Manchester | A rating |
| WORLDWIDE WEST 2 EAST SERVICES LTD T/A World Wide Services | London | A rating |
| Worley Europe Limited | London | A rating |
| Worlingham Pharmacy | Beccles | A rating |
| Worlington Hall | Bury St Edmunds | A rating |
| WORLTA HEALTH CARE LTD | Sutton | A rating |
| Wormald Burrows Partnership Limited | Biggleswade | A rating |
| WORMLY NEWS | WORMLY | A rating |
| Worn Again Technologies Limited | Nottingham | A rating |
| Worry+Peace Technology Limited | High Wycombe | A rating |
| Worship Jesus Ministries | Ipswich | A rating |
| Worsley Golf Club | Manchester | A rating |
| Worsley Plant Ltd | Middlewich | A rating |
| Worth School | Turners Hill | A rating |
| Worth Technology Limited | Cambridge | A rating |
| Worthers Limited | Clevedon | A rating |
| Worthing FX Services Ltd | Worthing | A rating |
| Worthing Homes Limited | Worthing | A rating |
| Worthing Medical Group | Worthing | A rating |
| Worthing Rugby Football Club Limited | Littlehampton | A rating |
| Worthing Specsavers Hearcare Limited | Worthing | A rating |
| Worthing Thunder CIC | Haywards Heath | A rating |
| Worthing Visionplus Ltd T/A Specsavers Opticians | Worthing | A rating |
| Worthingtons Solicitors | Belfast | A rating |
| Worton Construction Limited | Isleworth | A rating |
| WOSIWOSI FOODS LIMITED | Basildon | A rating |
| Wotton Rise Nursing Home Ltd | Gloucester | A rating |
| WOUGHTON HOUSE MANOR HOTEL LIMITED | MILTON KEYNES | A rating |
| Woven by Toyota UK Limited | London | A rating |
| Woven Floors Ltd | London | A rating |
| Woven Labels UK Ltd | Narberth | A rating |
| WovenLight Limited | London | A rating |
| Wow interiors Yorkshire | Wakefield | A rating |
| WOW Strat Limited | Edenbridge | A rating |
| Wow Treats Ltd | Bedford | A rating |
| WOWBEE | London | A rating |
| WOWBOXME LIMITED | LEIGHTON BUZZARD | A rating |
| Wowcher Limited | London | A rating |
| Wozair Limited | Gillingham | A rating |
| WP Callander & Co | Dumfries | A rating |
| WP3 Ltd | London | A rating |
| WPG Limited | Welshpool | A rating |
| WPI Economics | London | A rating |
| WPN Chameleon Limited | London | A rating |
| WPP 2005 Limited | London | A rating |
| WPP Brands (UK) Limited | London | A rating |
| WPP Media UK Limited | London | A rating |
| WPP Production Limited | London | A rating |
| WPPC LLP | London | A rating |
| WPS Compliance Consulting Ltd | Northamptonshire | A rating |
| WPS United Kingdom Ltd | Swindon | A rating |
| WPWA Limited | London | A rating |
| WQ Sub Limited | Southampton | A rating |
| WR Andal Ltd T/A Rathiga Restaurant | Luton | A rating |
| WR ENTERPRISES LIMITED | London | A rating |
| WR York Limited/TA York Estates Knightsbridge | London | A rating |
| WRAC | LONDON | A rating |
| Wrafton House | Hatfield | A rating |
| Wrafton Laboratories Limited (Perrigo UK) | Braunton | A rating |
| Wrap Wiz Limited | London | A rating |
| Wraps and Wings Limited | Wanstead | A rating |
| Wraptor Ltd | Alcester | A rating |
| WRAYSBURY HOUSE LIMITED | WORTHING | A rating |
| Wrekin Old Hall Trust Ltd | Telford | A rating |
| Wrekin Products Ltd | Lichfield | A rating |
| Wren Academy | London | A rating |
| Wren Games Ltd. | Romsey | A rating |
| Wren Hall Nursing Home | Selston | A rating |
| Wren Hall Nursing Home | Selston, | A rating |
| Wren House Infrastructure Management Limited | London | A rating |
| Wren Kitchens Limited | Barton-Upon-Humber | A rating |
| Wren Laboratories Limited | Andover | A rating |
| Wren Pubs Limited | Southhampton | A rating |
| Wren sterling Financial Planning | Nottingham | A rating |
| Wrenbury Medical Practice | Nantwich | A rating |
| Wrenbury Nursing Home | Cheshire | A rating |
| WRENCH LIMITED | LONDON | A rating |
| Wrenthorpe Sports (Cricket) Club | Wakefield | A rating |
| Wrexham AFC Limited | Wrexham | A rating |
| Wrexham Senior Homecare Ltd | Wrexham | A rating |
| Wrexham University | Wrexham | A rating |
| Wrexham Ventures Ltd | Wrexham | A rating |
| Wrexham Visionplus Limited t/a Specsavers | Wrexham | A rating |
| Wrexhamgarages Limited | Newtown | A rating |
| WRG Europe Ltd | Exeter | A rating |
| WRH Ltd | London | A rating |
| WRI Europe | London | A rating |
| Wright & Wright Architects LLP | London | A rating |
| Wright Brothers Oyster House Limited | London | A rating |
| Wright Creative Ltd | London | A rating |
| Wright Dental Care Ltd | Worksop | A rating |
| WRIGHT JUSTICE SOLICITORS | BIRMINGHAM | A rating |
| Wright Tiles LTD T/A Just Tiles | Harpenden | A rating |
| Wright Vigar Limited | Lincoln | A rating |
| WRIGHT WEARS LIMITED | Milton Keynes | A rating |
| Wrightington Wigan and Leigh Teaching Hospital NHS Foundation Trust | Wigan | A rating |
| Wrights Estate Agents Trading as MB Wright | Welwyn Garden city | A rating |
| Wrights Landscapes Group Ltd | Maidstone | A rating |
| Wrigley Ronan Property | London | A rating |
| WRISK LIMITED | London | A rating |
| Writech Industrial Services Ltd | SALFORD | A rating |
| Writer UK HQ Limited | London | A rating |
| Writer's Landing Ltd | London | A rating |
| Writers' Centre Norwich | Norwich | A rating |
| Written Byte Ltd. | London | A rating |
| WRM & Partners LTD | South Woodford | A rating |
| WRM CAPINVEST LTD | London | A rating |
| WRONG FUEL RECOVERIES LIMITED | Stoke-On-Trent | A rating |
| Wrose Pizza Limited | Bradford | A rating |
| Wrose Village Cars Limited | Bradford | A rating |
| Wrotham School Academy | Sevenoaks | A rating |
| Wrought Iron Worx Limited | London | A rating |
| WRT Technologies Limited | London | A rating |
| WRU Gwent Rugby Limited | Newport | A rating |
| WRYTHE LANE CONVENIENCE STORE | Carshalton | A rating |
| WS BUTCHERS LTD | BIRMINGHAM | A rating |
| WS Hewitson and Sons | Stockton on Tees | A rating |
| WS Investments Limited | Birmingham | A rating |
| WS Marine Ltd | Sandown | A rating |
| WS PROJECT LTD | Dudley | A rating |
| WS4 Dental Care Ltd | Walsall | A rating |
| WSA Tax Limited | London | A rating |
| WSC Products UK Ltd | Darwen | A rating |
| WSC SPORTS TECHNOLOGIES LTD | London | A rating |
| WSE Lounge & Restaurants Ltd T/A The Poachers Gastro Pub | Wokingham | A rating |
| WSELP Manco Ltd | London | A rating |
| WSL FOOD SERVICES LTD | Walsall | A rating |
| WSM Partners LLP | Wimbledon | A rating |
| WSM Ultrasound Ltd t/a Window to the Womb | Weston-super-Mare | A rating |
| WSO2 (UK) Limited | London | A rating |
| WSOGMM LTD | LONDON | A rating |
| WSP Engineering Ltd | LEICESTER | A rating |
| WSP Group Limited | London | A rating |
| WSRW t/a U-Dox | LONDON | A rating |
| WSS Energy Consulting Limited | Woking | A rating |
| Wst Trip Ltd | London | A rating |
| WSW Future Ltd | Doncaster | A rating |
| WSX Hampshire Ltd | Southampton | A rating |
| WT Datatech Ltd | Milton Keynes | A rating |
| WT Lamb Holdings Ltd | Billingshurst | A rating |
| WT NB Opco 1 Limited | London | A rating |
| WT Partnership | Croydon | A rating |
| WTA Tour Inc | London | A rating |
| WTA Ventures (UK) Operations Limited | London | A rating |
| WTax UK Limited | London | A rating |
| WTiN (World Textile Information Network) Ltd | Leeds | A rating |
| WTL Dental Limited | Norfolk | A rating |
| WTS 2020 Limited | London | A rating |
| WTS Energy UK Limited | Cheltenham | A rating |
| WTS TRADING LIMITED | Worcester | A rating |
| WTUK Limited | West Bridgford | A rating |
| WTVets Limited | Yatton | A rating |
| WU ASSOCIATES LIMITED | London | A rating |
| WU KONG LTD | Oxfordshire | A rating |
| Wubbleyou Limited | North Shields | A rating |
| Wuka Ltd | St Albans | A rating |
| WUKONG ORIENTAL FOOD | Surrey | A rating |
| WULARCO UK LIMITED | Watford | A rating |
| Wull Technologies | Manchester | A rating |
| Wunder Crumble Limited | Bradford | A rating |
| Wunderkind Technologies UK Ltd | London | A rating |
| Wunderman Thompson Commerce UK Limited | London | A rating |
| Wurel House | Sittingbourne | A rating |
| WURL Network UK Ltd | London | A rating |
| Wurth UK Ltd | Erith | A rating |
| WuXi AppTec UK Ltd | Cambridgeshire | A rating |
| WuXi Biologics UK Ltd | London | A rating |
| WUZJS Limited t/a Jaipur Spice | Easingwold | A rating |
| WV Foods Limited | Wolverhampton | A rating |
| WVC Service Ltd | Byfleet | A rating |
| Wve Money Limited | London | A rating |
| WW GBR Ltd | Slough | A rating |
| WW Giles (Smithfield) Ltd | Pangbourne | A rating |
| WW Norton & Company LTD | London | A rating |
| WWAC Automotive Ltd T/As Bosch Service Reading | Reading | A rating |
| WWF-WORLD WIDE FUND FOR NATURE (FORMERLY WORLD WILDLIFE FUND) | Woking | A rating |
| WWIIS Services Ltd | Stevenage | A rating |
| WWL UK LTD | Dagenham | A rating |
| WWSS Ltd | Newcastle under Lyme | A rating |
| WWT EMEA UK Limited | London | A rating |
| WWT PILGRIM LTD | London | A rating |
| www.career-opportunity.com Ltd | Reading | A rating |
| www.meetmytutors.com | Leicester | A rating |
| WX2 Retail Limited t/a WX Retail | Waltham Cross | A rating |
| WY&SF Ltd | Reading | A rating |
| Wychbury Medical Group | Stourbridge | A rating |
| Wychdene Residential Care Home | Kent | A rating |
| Wychwood Park Hotel | Crewe | A rating |