| FLORAL LIMITED | London | A rating |
| Florida State University International Programs Association UK | London | A rating |
| FLOS UK LIMITED | HARROGATE | A rating |
| Flotation Energy Limited | Edinburgh | A rating |
| Flowserve GB Limited | Newark | A rating |
| FLSmidth UK Limited | Altrincham | A rating |
| Fluke (UK) Limited | Norwich | A rating |
| Fluor Limited | Farnborough | A rating |
| Flywire Payments Limited | London | A rating |
| FM Insurance Europe S.A. UK Branch | Maidenhead | A rating |
| FMC Technologies Ltd | Dunfermline | A rating |
| FMR Investment Management (UK) Ltd | London | A rating |
| Fnatic Ltd | London | A rating |
| FNZ (UK) Limited | Edinburgh | A rating |
| Focchi Ltd | London | A rating |
| Focus Finder Limited | London | A rating |
| Foilco Limited | Warrington | A rating |
| Folio3 Software UK | Woking | A rating |
| Fonoa Technologies UK Ltd | London | A rating |
| FOR-A UK Limited | Chessington | A rating |
| Forage UK Operations Limited | London | A rating |
| Ford Motor Company Limited | Essex | A rating |
| FORDHAM UNIVERSITY UK CHARITABLE TRUST | London | A rating |
| Forensic Risk Alliance Limited | London | A rating |
| FORESCOUT TECHNOLOGIES UK LTD | London | A rating |
| Forester Holdings (Europe) Limited | Bromley | A rating |
| ForFarmers UK Limited | Rougham | A rating |
| Forge Europe UK Ltd. | London | A rating |
| Foris GFS UK Limited | London | A rating |
| FORMA Brands UK Limited | London | A rating |
| FORMAGRID UK LIMITED | London | A rating |
| Formech International Ltd | Harpenden | A rating |
| Formica Limited | North Shields | A rating |
| Formtech Composite Limited | Abingdon | A rating |
| Formula One Management Limited | Westerham | A rating |
| Forrester Research Limited | London | A rating |
| Forsta Worldwide Ltd | London | A rating |
| Fortegra Europe Limited | London | A rating |
| Forter Solutions UK Limited | London | A rating |
| Forterro UK Limited | London | A rating |
| Fortescue UK Services Limited | Bristol | A rating |
| Fortescue Zero Limited | Kidlington | A rating |
| FORTIL UK LTD | BRISTOL | A rating |
| FORTINET UK LTD | Reading | A rating |
| Fortis Games Limited | London | A rating |
| Fortna UK Limited | Milton Keynes | A rating |
| Fortrea Development Limited | Maidenhead | A rating |
| Fortress Investment Group (UK) Limited | London | A rating |
| Fortude PTE Limited | London | A rating |
| Fortum O&M (UK) Ltd | Grangemouth | A rating |
| Fortune Bee Limited | London | A rating |
| Fortune Media Group (UK) Limited | Dartford | A rating |
| Forum for the Future | London | A rating |
| FORVIS Global Advisory UK Limited | London | A rating |
| Forvis Mazars LLP | London | A rating |
| Forwessun International Limited | Speke | A rating |
| Fosun Management (UK) Limited | London | A rating |
| Founders For Good Ltd. | London | A rating |
| FOUNT UK Limited | London | A rating |
| Four Agency Worldwide Limited | London | A rating |
| Four Seasons Hotel London at Tower Bridge | London | A rating |
| Fourth Limited | London | A rating |
| Fox Head Britain | Quedgeley | A rating |
| Fox Marble Limited | London | A rating |
| Fox's Biscuits Limited | Batley | A rating |
| Fox's Burton's Companies (FBC) UK Limited | London | A rating |
| FPP Investment Management Limited | London | A rating |
| FPT Software United Kingdom Ltd. | London | A rating |
| FR AVIATION LIMITED | Dorset | A rating |
| Fractal Analytics UK Ltd | London | A rating |
| Fragomen LLP | London | A rating |
| Fraikin Ltd | Coventry | A rating |
| Framatome Limited | Avonmouth | A rating |
| Framatome UK Limited | Avonmouth | A rating |
| Franchise Brands PLC | Macclesfield | A rating |
| Francisco Partners Operations LLP | London | A rating |
| Frank Hirth plc | London | A rating |
| Frank Wright Limited t/a Trouw Nutrition GB | Ashbourne | A rating |
| Franke UK Limited | Manchester | A rating |
| Franklin Templeton Global Investors Limited | London | A rating |
| FranklinCovey Europe Limited | Banbury | A rating |
| Frasers Hospitality UK Limited | London | A rating |
| Frauscher UK Ltd | Farnborough | A rating |
| Frazier & Deeter UK LLP | London | A rating |
| Fred Perry Limited | London | A rating |
| Fred. Olsen Windcarrier Limited | Lowestoft | A rating |
| FRED250 trading as Cipriani London | London | A rating |
| FreeBalance UK CO. LTD | London | A rating |
| Freedman International Ltd | London | A rating |
| FREEDOM PRIME UK LIMITED | London | A rating |
| Freedom Sportsline Ltd | London | A rating |
| FREEDOMPAY WORLD EUROPE LIMITED | LONDON | A rating |
| Freelancer Outsourcing UK Limited | London | A rating |
| Freepoint Commodities Europe LLP | London | A rating |
| Freightliner Group Limited | Birmingham | A rating |
| Freixenet Copestick Limited | Newbury | A rating |
| FremantleMedia Group Limited | london | A rating |
| Fremman Limited | London | A rating |
| French Connection (London) Limited | London | A rating |
| Frequentis UK Ltd | Twickenham | A rating |
| Frere Hall Capital Management Ltd | London | A rating |
| Fresenius Medical Care Renal Services Ltd | Sutton in Ashfield | A rating |
| FRESH GRAVITY SOFTWARE SERVICES UK LTD | London | A rating |
| Freshfields Service Company | London | A rating |
| FRESHWORKS TECHNOLOGIES UK LIMITED | London | A rating |
| Freud Communications Limited | London | A rating |
| Freudenberg Filtration Technologies UK Ltd | Crewe | A rating |
| Freudenberg Sealing Technologies Ltd | North Shields | A rating |
| FREYR LIFE SCIENCES LTD | Berkshire | A rating |
| Freyssinet Limited | Telford | A rating |
| Fried, Frank, Harris, Shriver & Jacobson (London) LLP | London | A rating |
| Friedrich-Ebert-Stiftung London Office | London | A rating |
| FRIEZE EVENTS LIMITED | LONDON | A rating |
| Froneri International Limited | Northallerton | A rating |
| Front Europe Limited | London | A rating |
| Frontier Developments plc | Cambridge | A rating |
| Frontier Economics | London | A rating |
| Frontier Science (Scotland) Limited | Kincraig | A rating |
| Frontier Strategy UK Limited | London | A rating |
| Frontline Ventures Management Company | London | A rating |
| Frost & Sullivan | London | A rating |
| FS GROUP ADVISORY LIMITED | London | A rating |
| FTAI AirOpCo UK Ltd | Cardiff | A rating |
| FTI Consulting LLP | London | A rating |
| FTT (UK) Limited | Derby | A rating |
| FTV Management International, Ltd | London | A rating |
| Fuelco Limited | Harrow | A rating |
| Fuelcomm UK Limited | London | A rating |
| Fuerst Day Lawson | London | A rating |
| Fugro GB Limited | Wallingford | A rating |
| Fuji Industries UK Ltd | 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 |
| Fulcrum Asset Management LLP | London | A rating |
| Fulcrum Capital (Europe) Ltd | London | A rating |
| FULCRUM DIGITAL (UK) LIMITED | London | A rating |
| Fulcrum Global Technologies UK Limited | London | A rating |
| Fulham Football Club Limited | New Malden | A rating |
| Fulton Market Group Europe Ltd | London | A rating |
| Funcell Games UK Ltd | London | A rating |
| FundApps Ltd | London | A rating |
| FUNDING CIRCLE LTD | LONDON | A rating |
| Funko UK, Ltd | London | A rating |
| Furlong Business Solutions Ltd | Andover | A rating |
| Furukawa Electric Europe Limited | London | A rating |
| Furuno (UK) Limited | Havant | A rating |
| Fusion Asset Management Services Ltd | London | A rating |
| Fusion Business Solutions (UK) Ltd. | Sunbury-On-Thames | A rating |
| Fusion Health Technology Solutions UK Ltd | London | A rating |
| Fusion Practices Limited | London | A rating |
| Fusion Risk Management UK, Ltd | Crawley | A rating |
| Fusion Specialty UK Ltd | Oxford | A rating |
| FusionAIx Technologies Limited | London | A rating |
| Futaba Manufacturing UK Ltd | Burnley | A rating |
| Futerra Ltd | London | A rating |
| Future Electronics Limited | Egham | A rating |
| Future Generation Services Ltd | Rochester | A rating |
| Future PLC | London | A rating |
| FUYO LEASE EUROPE LTD | London | A rating |
| Fuze Europe (UK) Limited | Reading | A rating |
| Fyber Digital UK Ltd | London | A rating |
| G & J LUMLEY LTD | WEST YORKSHIRE | A rating |
| G MODIANO LTD | LONDON | A rating |
| G S-Hydro UK Limited | Aberdeen | A rating |
| G-TEKT Europe Manufacturing Limited | Gloucester | A rating |
| G. H. Financials Limited | London | A rating |
| G10X PVT Limited | London | A rating |
| G2 Crowd Ltd | London | A rating |
| G2V Recruitment Group Limited | London | A rating |
| G3 Worldwide Mail (UK) Limited | Southall | A rating |
| G4S Corporate Services Limited | London | A rating |
| G4S Regional Management | Worksop | A rating |
| GA RETAIL S.R.L. | LONDON | A rating |
| GAC Logistics (UK) Limited | Manchester | A rating |
| Gaeltec Utilities UK Limited | Irvine | A rating |
| Gagosian Gallery of London | London | A rating |
| Gain Theory Limited | London | A rating |
| Gainsborough Hotel (Bath) Ltd | Bath | A rating |
| Gainsight UK Ltd | London | A rating |
| GALANZ (UK) LIMITED | London | A rating |
| Galapagos Biotech Limited | Hayes | A rating |
| Galatea Associates Ltd | Richmond | A rating |
| Galaxy Digital UK Limited | London | A rating |
| Galderma (UK) Ltd | London | A rating |
| Gallagher Bassett International Limited | Tamworth | A rating |
| Gallagher Benefit Services Management Company Limited | London | A rating |
| Gallaher Limited | London | A rating |
| Gallery 1957 (London) Limited | London | A rating |
| GAM (U.K.) Limited | London | A rating |