| Fort Security Doors Limited | Construction | 2017 |
| Fortitude Global Limited | Professional & scientific | 2020 |
| Fortitude Pilates Ltd | Other services | 2024 |
| Forty Four Finance Ltd | Professional & scientific | 2026 |
| Forum Centre (Dorchester) LLP | | 2015 |
| FORUM5 Ltd | Information & communication | 2022 |
| Forward Trucking Services (People) Ltd | Administrative & support | 2024 |
| Foster Risk Consulting Limited | Financial services | 2025 |
| Foster Talent Ltd | Administrative & support | 2021 |
| Fostermco Ltd | Wholesale & retail | 2013 |
| Foufas Ltd | Construction | 2024 |
| Foundation Marketing Group Ltd | Professional & scientific | 2021 |
| Four C Capital Investments Limited | Information & communication | 2015 |
| Four Oaks Consulting Limited | Professional & scientific | 2014 |
| Four Plus One Holdings Limited | Hospitality | 2022 |
| Four Seasons Office & Window Cleaning Limited | Administrative & support | 2010 |
| Fowler Forest Farm Limited | Real estate | 2012 |
| FOX Studio Beauty Ltd | Other services | 2024 |
| FOX the G Limited | Arts & recreation | 2025 |
| Foxgrove Homes Ltd | Real estate | 2025 |
| Foxlet Property Limited | Real estate | 2025 |
| Foxwell Media Services Ltd | Information & communication | 2026 |
| Foxwell Retail Consulting Ltd | Professional & scientific | 2020 |
| FP - Gaia 1 LLP | | 2021 |
| FP - Greenly 1 LLP | | 2022 |
| FP - Ixama 1 LLP | | 2020 |
| FP - Monorail 1 LLP | | 2022 |
| FP - Novade 1 LLP | | 2020 |
| FP - Umiami I LLP | | 2022 |
| FPW Consulting Ltd | Professional & scientific | 2014 |
| Fractional Sales Management Limited | Professional & scientific | 2024 |
| Fractional Ventures Ltd. | Information & communication | 2021 |
| Frame-Us Memorabilia Limited | Wholesale & retail | 2025 |
| Framework Consulting Services Limited | Professional & scientific | 1994 |
| Framework Pilates Ltd | Arts & recreation | 2023 |
| Franchise Local Ltd | Other services | 2021 |
| Francis Studio Design Ltd | Professional & scientific | 2025 |
| Franklee Arts Limited | Arts & recreation | 2026 |
| Frankly Insurance Services Ltd | Financial services | 2018 |
| Frantex Limited | Health & social care | 2025 |
| Frary Equine Limited | Manufacturing | 2012 |
| Frary Group Ltd | Financial services | 2018 |
| Frary Storage Ltd. | Administrative & support | 2006 |
| Fraten Limited | Real estate | 1997 |
| Frattina Services Ltd | Professional & scientific | 2019 |
| Frau & Lopez Small Animal Specialists Ltd | Professional & scientific | 2024 |
| Free Creative Studio Ltd | Professional & scientific | 2026 |
| Freeman Baker Associates Limited | Professional & scientific | 1988 |
| Freesia Place Property Limited | Real estate | 2025 |
| Freeway Capital Ltd | Real estate | 2013 |
| Freightlane Ltd | Transport & logistics | 2011 |
| Fresh Finesse Cleaners Ltd | Administrative & support | 2025 |
| Fresh Paint Decorators Ltd | Construction | 2025 |
| Fresh Slice Films Ltd | Information & communication | 2022 |
| Freshly Brewed Marketing Ltd | Professional & scientific | 2009 |
| Freshmint Digital Ltd | Professional & scientific | 2019 |
| Freshwater London Limited | Professional & scientific | 2020 |
| Friars Lodge Limited | Health & social care | 2004 |
| Friends Green Holdings Limited | Financial services | 2025 |
| Frontend Systems Limited | Information & communication | 2015 |
| Frontier Odin Limited Partnership | | 2019 |
| Frsh Consulting Ltd | Information & communication | 2023 |
| Frugalwise Ltd | Financial services | 2023 |
| Fruit and a Shape Limited | Information & communication | 2013 |
| Fryan Ltd | Wholesale & retail | 2024 |
| FS Managment Ltd | Real estate | 2022 |
| FS Partnerships Network Limited | Financial services | 2011 |
| Fuel Card Insights Limited | Professional & scientific | 2012 |
| Fugafit Ltd | Other services | 2020 |
| Full Send Squad Ltd | Wholesale & retail | 2022 |
| Fullard Medical Limited | Health & social care | 2013 |
| Fuller Strategic Holdings Limited | Financial services | 2025 |
| Fullgreen Ltd | Manufacturing | 2013 |
| Fullgreen UK Ltd | Other services | 2016 |
| Function Security Limited | Administrative & support | 2004 |
| Funding Consultants Ltd | Administrative & support | 2015 |
| Fuocos Property Services Ltd | Real estate | 2022 |
| Fuocos Technologies Ltd | Information & communication | 2022 |
| Furuti Ltd | Wholesale & retail | 2025 |
| Furzeland Limited | Manufacturing | 2002 |
| Fuse Wire Ltd | Construction | 2023 |
| Fuseaware Limited | Information & communication | 2016 |
| Fusion for Growth Ltd | Professional & scientific | 2018 |
| Futaiim Ltd | Wholesale & retail | 2022 |
| Futr Ltd | Professional & scientific | 2025 |
| Future Assured Limited | Professional & scientific | 2002 |
| Future IS Forever CIC | Education | 2026 |
| Future of Work Partners Ltd | Professional & scientific | 2026 |
| Futurepath Financial Planning Limited | Financial services | 2022 |
| Futureproof Frameworks Ltd | Professional & scientific | 2025 |
| Futurescool Ltd | Education | 2023 |
| Futuresource Consulting Limited | Professional & scientific | 1988 |
| Futuresource Holdings Limited | Other services | 2017 |
| FV I LLP | | 2021 |
| FW2 Ltd | Real estate | 2022 |
| FWE Limited | Other services | 2025 |
| G & H Land Ltd | Construction | 2024 |
| G & L Wholesale Limited | Wholesale & retail | 1999 |
| G a Cooper Properties 2017 Limited | Real estate | 2018 |
| G and D Vision Ltd | Construction | 2026 |