| FS Financial Services Limited | Southall | A rating |
| FS First Solution LTD | London | A rating |
| FS FOODZ UK LTD | LONDON | A rating |
| FS GROUP ADVISORY LIMITED | London | A rating |
| FS PRO TRADERS LTD | Manchester | A rating |
| FS Softwares Ltd | Rugby | A rating |
| FS SPICE LTD | Bournemouth | A rating |
| FS Store Ltd | Newcastle | A rating |
| FS Training and Consultancy Limited | Manchester | A rating |
| FS.COM INNOVATION LTD | Birmingham | A rating |
| FSE Foundry Ltd | Braintree | A rating |
| FSKPT Limited trading as The Physio Group | Newry | A rating |
| FSN AUTOS LTD t/a MI Garage | Glasgow | A rating |
| FSNE Medical | Camperdown Ind Est | A rating |
| FSP Consulting Services Limited | Reading | A rating |
| FSP(GB) Ltd | St. Albans | A rating |
| FST (Scotland) Ltd t/a Swagelok Scotland Teesside & Ireland | Aberdeenshire | A rating |
| FSU GP PRACTICE MANAGEMENT C.I.C. | Belfast | A rating |
| FT Childcare Ltd | London | A rating |
| FT Foods Limited | London | A rating |
| FT HAYWARDS LTD | Haywards Heath | A rating |
| FT Pipeline Systems Ltd. | Lichfield | A rating |
| FT Technologies (UK) Ltd | Sunbury-on-Thames | A rating |
| FTA ENGINEERS LTD | LONDON | A rating |
| FTAI AirOpCo UK Ltd | Cardiff | A rating |
| FTC Safety Solutions Limited | Wigston | A rating |
| FTCROWD Limited | Harlsdon | A rating |
| FTF Worldwide Event Management Ltd | CAMPTON | A rating |
| FTFT UK LIMITED | LONDON | A rating |
| FTG Care and Consultancy Services Limited | Stoke-On-Trent | A rating |
| FTG DEVELOPMENT AND INVESTMENT LTD | London | A rating |
| FTI Consulting LLP | London | A rating |
| FTLLOG UK LTD | Erith | A rating |
| FTMR Bournemouth Ltd | Bournemouth | A rating |
| Ftoni Construction Ltd | London | A rating |
| FTSH Leicester Ltd T/A Fattoush Urban Lebanese Kitchen | Enderby | A rating |
| FTSQUARED | London | A rating |
| FTT (LONDON) LIMITED | Highgate | A rating |
| FTT (UK) Limited | Derby | A rating |
| FTTX and Energy Warehouse Limited | Rochdale | A rating |
| FTV Management International, Ltd | London | A rating |
| FTV Proclad International Ltd | Glenrothes | A rating |
| FTZ FOODS LIMITED | Harlow | A rating |
| Fu Hong Restaurant | Liverpool | A rating |
| Fu3e Limited | Three Bridges | A rating |
| FUANN LTD | London | A rating |
| Fuchs Lubricants (UK) PLC | Stoke-on-Trent | A rating |
| Fuchsia Homecare Ltd | Ipswich | A rating |
| FUDWAVES LIMITED | Manchester | A rating |
| FUEGO HOSPITALITY LIMITED | Swansea | A rating |
| Fuel Additive Science Technologies Ltd | Shrewsbury | A rating |
| Fuel Cafe Ltd | Manchester | A rating |
| Fuel Cell Systems Limited | Hungerford | A rating |
| FUEL CONVENIENCE RETAIL LTD T/A Shell Durham Carville | Durham | A rating |
| FUEL EFFICIENT LTD | IPSWICH | A rating |
| FUEL ENERGY UK LTD | Newmarket | A rating |
| Fuel Fixer ltd | East Grinstead | A rating |
| Fuel Learning Limited | Swadlincote | A rating |
| Fuel Power Ltd | Sheffield | A rating |
| Fuel Service Ltd | Orrell | A rating |
| Fuel Storage Solutions Limited | Bradford | A rating |
| Fuelco Limited | Harrow | A rating |
| Fuelcomm UK Limited | London | A rating |
| Fueled Ltd | Gateshead | A rating |
| Fuelocity Group Ltd | Middlesbrough | A rating |
| Fuerst Day Lawson | London | A rating |
| Fugen UK Limited | Harrow | A rating |
| Fugro GB Limited | Wallingford | A rating |
| Fujax UK Limited | London | A rating |
| Fuje Art Ltd | COVENTRY | A rating |
| Fuji Industries UK Ltd | London | A rating |
| Fuji London Ltd T/A Fuji | London | A rating |
| Fuji Seal Europe Limited | Gillingham | A rating |
| Fuji Trading Co Ltd | London | A rating |
| Fujichem Sonneborn Ltd | Ilford | A rating |
| Fujifilm Diosynth Biotechnologies UK Ltd | Stockton on Tees | A rating |
| FUJIFILM Speciality Ink Systems Limited | Broadstairs | A rating |
| FUJIFILM UK Ltd | Bedford | A rating |
| Fujikura Europe Limited | Chessington | A rating |
| FUJISANKEI COMMUNICATIONS INTERNATIONAL,INC. | London | A rating |
| Fujitec UK Limited | Crayford | A rating |
| Fujitsu Research of Europe Ltd. | Slough | A rating |
| Fujitsu Services Limited | Bracknell | A rating |
| Fukoku Life International (UK) Limited | London | A rating |
| Fukuda Denshi UK Ltd | Sheffield | A rating |
| Fulbeck-House Limited | Edinburgh | A rating |
| Fulcrum Asset Management LLP | London | A rating |
| Fulcrum Capital (Europe) Ltd | London | A rating |
| FULCRUM DIGITAL (UK) LIMITED | London | A rating |
| Fulcrum Diligence Ltd | London | A rating |
| Fulcrum Global Technologies UK Limited | London | A rating |
| Fulcrum Infrastructure Management Limited | London | A rating |
| Fulcrum Labs UK Limited | London | A rating |
| Fulfillment Partners Ltd | Coventry | A rating |
| Fulford Nursing Home | York | A rating |
| FULHAM BROADWAY BURGERS LTD | London | A rating |
| FULHAM CHIPPY LIMITED t/a Salt & Vinegar | London | A rating |
| Fulham Cross Academy | LONDON | A rating |
| Fulham Football Club Foundation | New Malden | A rating |
| Fulham Football Club Limited | New Malden | A rating |
| Fulham Palace Trust | London | A rating |
| FULHAM PHARMACY LTD | London | A rating |
| FULHAM PO LTD | LONDON | A rating |
| Fulham Upholstery Ltd | Fulham | A rating |
| Fulhouse limited | london | A rating |
| FULIA EDUCATION LTD | London | A rating |
| Fulkers Bailey Russell LLP | London | A rating |
| FULKRUM TECHNICAL RESOURCES LIMITED | London | A rating |
| Full Care Solutions Limited | Evesham | A rating |
| FULL CIRCLE CAPITAL SERVICES LIMITED | London | A rating |
| Full Circle Corporate Commincations Limited | London | A rating |
| Full Circle Generation Ltd | Belfast | A rating |
| FULL CIRCLE LIVING LTD | Maidstone | A rating |
| Full Circle Support UK LTD | Mitcham | A rating |
| Full Circle Wind Services UK Ltd | Edinburgh | A rating |
| Full City Ltd | Oxford | A rating |
| Full Communications Limited t/a Full Comms | London | A rating |
| Full Fat Commerce Ltd | Birmingham | A rating |
| Full Fibre Ltd | Exeter | A rating |
| Full House Restaurants Holdings Ltd | Chertsey | A rating |
| Full Hygiene Services Limited | London | A rating |
| FULL MASALA LIMITED T/A MAHARAJA INDIAN RESTAURANT | STIRLING | A rating |
| Full Scale Dynamics Limited | Sheffield | A rating |
| Full Steam Espresso Ltd T/A Volcano Coffee Works | London | A rating |
| FULL VOLUME PR LIMITED | Manchester | A rating |
| Fullbrook School | New Haw | A rating |
| FULLER BRILLIANT IDEAS LTD | London | A rating |
| Fuller Smith & Turner PLC | Chiswick | A rating |
| Fuller Thomson Heritable Ltd | Dundee | A rating |
| FULLERLONG LIMITED | Farnham | A rating |
| Fullhouse Group Ltd | London | A rating |
| Fullhurst Community College | Leicester | A rating |
| Fullness Of Christ For All Nations | Birmingham | A rating |
| FULLSAFE LIMITED | Wrexham | A rating |
| Fullstory International UK Limited | Sutton | A rating |
| Fullword Church (For the Nations) | London | A rating |
| Fully Distributed Systems Ltd | Loughborough | A rating |
| Fulmar Shipping Ltd | Woking | A rating |
| Fulona's Hair & Beauty Salon Ltd. | London | A rating |
| Fulston Manor Academies Trust | Sittingbourne | A rating |
| Fulton Market Group Europe Ltd | London | A rating |
| Fulwell 73 Ltd | London | A rating |
| Fulwell Golf Club Limited | Hampton Hill | A rating |
| Fulwood & Broughton Cricket Club | Preston | A rating |
| Fulwood Estates Investment Limited | Preston | A rating |
| Fumb Games Limited | Esher | A rating |
| Fun Fiesta Limited | London | A rating |
| Funcell Games UK Ltd | London | A rating |
| Fund for Global Human Rights UK | London | A rating |
| Fundamental Media Limited | London | A rating |
| Fundamental Textiles Ltd | Manchester | A rating |
| FundApps Ltd | London | A rating |
| FUNDING CIRCLE LTD | LONDON | A rating |
| FUNDINGXCHANGE LIMITED | London | A rating |
| FundOnion Limited | London | A rating |
| FUNDRE LIMITED | LONDON | A rating |
| Funds-Axis Limited | Belfast | A rating |
| Funfair Technologies Limited | London | A rating |
| Funfishers Out of School Club | York | A rating |
| FungiAlert Ltd | HARPENDEN | A rating |
| Funicular Productions Ltd | Dudley | A rating |
| Funk Enterprise Ltd T/A Funk Training Club | London | A rating |
| Funkids Nurseries Ltd | Harrow | A rating |
| Funko UK, Ltd | London | A rating |
| Funky Fones Ltd | Nottingham | A rating |
| Funlas Freights and Logistics Limited | London | A rating |
| Funtabee Limited | London | A rating |
| Funtura Ltd | Luton | A rating |
| Fuocos Pizza Franchising Limited | Cuffley | A rating |
| Fuoriporto Limited | Guildford | A rating |
| FURHAN & SONS LTD t/a Nisa Day To Day | Greenock | A rating |
| Furious Fox Limited | Canary Wharf | A rating |
| Furleigh Estate (Winery) Ltd | Bridport | A rating |
| Furley Page Solicitors | Canterbury | A rating |
| FURLINED LIMITED | LONDON | A rating |
| Furlong Business Solutions Ltd | Andover | A rating |
| Furmily Ltd | London | A rating |
| furnace house surgery | Carmarthen | A rating |
| Furness Cars and Commercials Ltd | Askam in Furness | A rating |
| Furness Controls Ltd | Bexhill On Sea | A rating |
| FURNESS CRICKET CLUB | Barrow-in-Furness | A rating |
| Furness Insurance Services | London | A rating |
| FURNESS PARTNERSHIP LIMITED | LONDON | A rating |
| Furnico Living LTD | Halifax | A rating |
| Furnish'd Ltd | Walton-on-Thames | A rating |
| Furnishings UK Ltd | Bradford | A rating |
| FURNITURE BROS LTD | ACCRINGTON | A rating |
| Furniture Direct (Derby) Ltd t/a Furniture Direct Derby | Derby | A rating |
| Furniture Emporium London Ltd | London | A rating |
| Furniture in Design LTD | Blackburn | A rating |
| FURNITURE TOWN LIMITED | Birmingham | A rating |
| FURNITURE VALLEY HOME LTD | Luton | A rating |
| Furniture Village | Slough | A rating |
| FURNITURE'S HUB LIMITED | Great Harwood | A rating |
| Furniture4u London Ltd | London | A rating |
| Furnival Farms Limited | Crewe | A rating |
| Furnival Quays LTD | Sheffield | A rating |
| Furnolic Co. Ltd | Coventry | A rating |
| Fursewood Ltd | Hattlepool | A rating |
| Furst Optima Ltd | Chertsey | A rating |