| Food Kulture Ltd | Wholesale & retail | 2026 |
| Food Safety Compliance Ltd | Administrative & support | 2014 |
| Food Service Logistics Limited | Transport & logistics | 2020 |
| FOR YOU Plus Ltd | Hospitality | 2026 |
| Ford Bentall LLP | | 2005 |
| Forest Gate Developments (Surrey) Ltd | Construction | 2019 |
| Forest Gate Residents Management Company Limited | Households | 2014 |
| Forest Road (24C) Limited | Real estate | 2015 |
| Form Follows Ltd | Construction | 2019 |
| Formula Marketing Ltd | Professional & scientific | 2020 |
| Formula Merchants LM Limited | Manufacturing | 2017 |
| Formula Merchants Ltd | Arts & recreation | 2007 |
| Formula to Perform Ltd | Other services | 2020 |
| Formwood Limited | Real estate | 2003 |
| Formwood Properties Ltd | Other services | 2024 |
| Forsight (Blackwater) Limited | Health & social care | 2011 |
| Fort Technologies Ltd | Information & communication | 2020 |
| Fort&Abbas Limited | Wholesale & retail | 2024 |
| Forth Studio Limited | Professional & scientific | 2011 |
| Fortis Wealth Management Ltd | Financial services | 2024 |
| Fortsafe Limited | Financial services | 2010 |
| Forty Four Life Science Advisors Ltd | Professional & scientific | 2017 |
| Forty Nine Ltd | Real estate | 2000 |
| Forward Flow Ltd | Information & communication | 2025 |
| Forward Project Solutions Ltd | Construction | 2018 |
| Foster Capital Ltd | Financial services | 2026 |
| Foundations Community Pre-School Ltd | Education | 2010 |
| Foundations Holdings Limited | Financial services | 2017 |
| Fountain Maintenance Limited | Administrative & support | 2020 |
| Four Plus Solutions Limited | Administrative & support | 2016 |
| Four Roots Ventures Ltd | Real estate | 2025 |
| Four Seasons Landscaping & Gardening Services Ltd | Administrative & support | 2003 |
| Fourimpact Limited | Professional & scientific | 2003 |
| Fourpointthree Limited | Professional & scientific | 2025 |
| Foxhills Timber and Builders Merchants Ltd | Wholesale & retail | 2023 |
| FOY Foodmaster Limited | Hospitality | 2021 |
| FPD Limited | Professional & scientific | 2005 |
| FPL Commercial Management Ltd | Real estate | 2020 |
| Fractyl Ltd | Professional & scientific | 2021 |
| Frame Remedy Ltd | Information & communication | 2024 |
| Fran DE LUZ Ltd | Wholesale & retail | 2026 |
| Francisco's Europe Limited | Manufacturing | 2014 |
| Frank & Flo's Limited | Health & social care | 2026 |
| Frankalex Ltd | Administrative & support | 2025 |
| Frankie & BEN Limited | Real estate | 2022 |
| Frankscroft Investments Limited | Other services | 2009 |
| Fravells Holdings Limited | Financial services | 2024 |
| Fravells Limited | Administrative & support | 2019 |
| Frazers Surveyors Limited | Professional & scientific | 2003 |
| Freedom Travel & Cruise Ltd | Administrative & support | 2013 |
| Freeholders of 361 Hither Green Lane Limited | Households | 2010 |
| Freeman Projects Ltd | Construction | 2020 |
| Freeoaks Limited | Households | 2026 |
| Fresch Coffee House Limited | Hospitality | 2015 |
| Fresh Depiction Ltd | Wholesale & retail | 2021 |
| Fresh Edit Ltd | Information & communication | 2022 |
| Fresh Solutions Ltd | Information & communication | 2004 |
| Friar House RTM Company Limited | Households | 2024 |
| Friends of Horsell Limited | Households | 2022 |
| Friends of the Elderly | Health & social care | 1914 |
| Friends of the Elderly Trading Limited | Other services | 1998 |
| Friends PAW Life Ltd | Professional & scientific | 2022 |
| Frisson Film Ltd | Information & communication | 2008 |
| Frog/Hare Consulting Limited | Professional & scientific | 2013 |
| Froggatt Investments Limited | Construction | 1961 |
| Frontera Ltd | Wholesale & retail | 2005 |
| Frost Wilson Design Ltd | Manufacturing | 2022 |
| Frye Capital Ltd | Information & communication | 2026 |
| FTD Associates Limited | Professional & scientific | 2021 |
| Ftnr Consulting Limited | Information & communication | 2023 |
| Fugeesound Limited | Information & communication | 2009 |
| Fulgur Engineering Limited | Professional & scientific | 2015 |
| Full Circle Advisor Ltd | Information & communication | 2024 |
| Full Circle Scenery Ltd | Construction | 2019 |
| Fullshopping Ltd | Households | 2025 |
| Fulmar Shipping Limited | Transport & logistics | 2016 |
| FUN GUY Productions Ltd | Arts & recreation | 2023 |
| Funky Business Services Ltd | Information & communication | 2017 |
| Funky Pottery Painting Ltd | Education | 2026 |
| Furama Investments PTE Ltd | Financial services | 2024 |
| Furness Tree Care Ltd | Agriculture & fishing | 2025 |
| Further Step Electrical Ltd | Construction | 2022 |
| Furzehill Place Estate Ltd | Agriculture & fishing | 2014 |
| Futronics Group Limited | Professional & scientific | 2012 |
| Futronics Limited | Manufacturing | 2000 |
| Futronics Rail Limited | Administrative & support | 2011 |
| Futronics UK Limited | Administrative & support | 2003 |
| Future Energies Limited | Extraterritorial | 2002 |
| Future Grounds Care Ltd | Administrative & support | 2024 |
| Future Industrial and Welding Supplies Ltd. | Extraterritorial | 1986 |
| Future Matters Limited | Professional & scientific | 2004 |
| Future Vision Marketing & Consultancy Ltd | Information & communication | 2014 |
| Futuregen Solutions Ltd | Information & communication | 2025 |
| Futurethread Ltd | Professional & scientific | 2026 |
| Fuze Pickleball Ltd | Manufacturing | 2024 |
| FWH Development Limited | Professional & scientific | 2018 |
| FWH Property Ltd | Real estate | 2019 |
| Fyers Properties Limited | Real estate | 2012 |
| Fyntek Group Ltd | Financial services | 2019 |
| G & L Consultants Limited | Information & communication | 1998 |