| Fqin Ltd | Wholesale & retail | 2017 |
| FR Magnetic Materials Consulting Ltd | Professional & scientific | 2020 |
| Fr@Co Ltd | Financial services | 2025 |
| FRA Management Ltd | Construction | 2012 |
| FRA Smith Ltd | Arts & recreation | 2022 |
| Fractal Strategic Land Limited | Real estate | 2019 |
| Fractional Football Ltd | Arts & recreation | 2025 |
| Fragdon Limited | Administrative & support | 2024 |
| Fragile Limited | Transport & logistics | 2015 |
| Fragolino Ltd | Hospitality | 2017 |
| Fragranceaz Ltd. | Other services | 2025 |
| Fralsa Limited | Professional & scientific | 2017 |
| Frame Collective CIC | Professional & scientific | 2015 |
| Framego Ltd | Information & communication | 2025 |
| Framemaster Commercial Ltd | Construction | 2013 |
| Frames of Impact CIC | Arts & recreation | 2025 |
| Framig Ltd | Manufacturing | 2019 |
| Fran Services Ltd | Administrative & support | 2015 |
| Fran's Happy Hounds Ltd | Hospitality | 2022 |
| France Ciroufen International Group Co., Ltd. | Manufacturing | 2020 |
| Frances Duffy Consulting Limited | Professional & scientific | 2022 |
| Francesca Hill Limited | Professional & scientific | 2016 |
| Francis Communications Limited | Professional & scientific | 2012 |
| Francis Dupuy Wines Ltd | Wholesale & retail | 2019 |
| Francis House Management (Penylan) Limited | Households | 2021 |
| Francis Lloyd Ltd | Real estate | 2019 |
| Francis Medical Ltd | Health & social care | 2022 |
| Francis Social Care Limited | Health & social care | 2015 |
| Francisco Property Investments Ltd | Real estate | 2017 |
| Francofield L.P. | | 2016 |
| Francolist Ltd | Wholesale & retail | 2024 |
| Frank and Otis Brewing Ltd | Manufacturing | 2019 |
| Frank Image Limited | Professional & scientific | 2014 |
| Frank Palmers Couriers Ltd | Other services | 2019 |
| Frank Pearson Consulting Limited | Professional & scientific | 2012 |
| Frank Thoms Trading Limited | Wholesale & retail | 2022 |
| Frank Vincent Electrical Ltd | Construction | 2024 |
| Franklin Aurora Limited | Wholesale & retail | 2021 |
| Franklin Entertainment Ltd | Arts & recreation | 2025 |
| Frankly Materials Ltd | Wholesale & retail | 2017 |
| Franks and Toms Architects Limited | Professional & scientific | 2011 |
| Franx Limited | Health & social care | 2019 |
| Fraser Carver Executive Search Limited | Other services | 2010 |
| Frasoft Limited | Information & communication | 2025 |
| Fratelli Limited | Professional & scientific | 2019 |
| Fravort | Administrative & support | 2025 |
| Frazer Drexel Limited | | 1987 |
| Frazer Gullys Ltd | Wholesale & retail | 2023 |
| Frbc Ltd | Construction | 2016 |
| FRC Benefits Ltd | Administrative & support | 2022 |
| Frdstech Ltd | Wholesale & retail | 2025 |
| Freakhouse Graphics Limited | Professional & scientific | 2004 |
| Freakoutnation Ltd | Administrative & support | 2025 |
| Freckles and BOO Limited | Wholesale & retail | 2020 |
| Frecycle Ltd | Information & communication | 2021 |
| Fred Daniels London Ltd | Wholesale & retail | 2020 |
| Fred Hookins Ltd | Wholesale & retail | 2024 |
| Fred Pole Limited | Wholesale & retail | 2020 |
| Fred's Groundworks Limited | Administrative & support | 2025 |
| Fredbar Ltd | Construction | 2018 |
| Freddiebv Ltd | Administrative & support | 2025 |
| Frederick Parker Group Public Limited Company(The) | | 1978 |
| Fredexo | Professional & scientific | 2025 |
| Free Dive Holidays Ltd | Administrative & support | 2025 |
| Free Independent Ltd | Hospitality | 2023 |
| Free LET Ltd | Real estate | 2018 |
| Free Link Organisation Limited | Professional & scientific | 1997 |
| Free Mood Ltd | Wholesale & retail | 2021 |
| Free Time Vehicles Ltd | Wholesale & retail | 2018 |
| Freedive Ltd | Information & communication | 2013 |
| Freedo Films Limited | Information & communication | 2025 |
| Freedom 360 Limited | Other services | 2018 |
| Freedom Developments Limited | Construction | 2003 |
| Freedom Empire Limited | Health & social care | 2015 |
| Freedom Mobility Aids Limited | Construction | 2024 |
| Freedy & Sugar Limited | Hospitality | 2015 |
| Freeflow Ventilation Ltd | Construction | 2016 |
| Freefocusfilm Limited | Professional & scientific | 2021 |
| Freelending CIC | Water & waste | 2008 |
| Freelikebee Limited | Wholesale & retail | 2025 |
| Freely Properties Ltd | Real estate | 2020 |
| Freemag Publishing Limited | Information & communication | 2017 |
| Freeman Capital Logistics Limited | Transport & logistics | 2016 |
| Freemans Accountancy NO 2 Ltd | Professional & scientific | 2021 |
| Freemason Properties Ltd | Real estate | 2010 |
| Freemyhouse.Com Ltd | Real estate | 2017 |
| Freestyle Drylining Ltd | Construction | 2017 |
| Freethion | Professional & scientific | 2024 |
| Freez Winter Ltd | Wholesale & retail | 2024 |
| Freezbone. Ltd | Wholesale & retail | 2025 |
| Freeze Holdings Ltd | Health & social care | 2018 |
| Freezehusk Limited | Wholesale & retail | 2025 |
| Freight Media Limited | Information & communication | 2015 |
| Freight Movement Limited | Wholesale & retail | 1998 |
| Freight Racing Ltd | Professional & scientific | 2021 |
| Freight Recruitment Ltd | Administrative & support | 2017 |
| Freight Solutions Consulting Limited | Administrative & support | 2014 |
| Freight Systems Express (Wales) Holdings Limited | Financial services | 2011 |
| Freight Systems Express (Wales) Limited | Transport & logistics | 2002 |
| Freight Systems Express Worldwide Limited | Extraterritorial | 2015 |