| Form + Function Holding Ltd | Financial services | 2025 |
| Form + Function Studio Ltd | Construction | 2024 |
| Forsecure FS Ltd | Wholesale & retail | 2017 |
| Forsecure Ltd | Administrative & support | 2016 |
| Forsite Estates Limited | Real estate | 1998 |
| Fortem Capital Holdings Limited | Administrative & support | 2017 |
| Fortem Capital Limited | Administrative & support | 2016 |
| Fortmill Finance Limited | Financial services | 1984 |
| Fortnum Futura International Ltd. | Wholesale & retail | 1994 |
| Fortree Partners Limited | Financial services | 2023 |
| Fortune Homes and Estates Ltd | Real estate | 2017 |
| Forty Primrose Gardens Management Limited | Households | 1975 |
| Forty Two Green Limited | Real estate | 2022 |
| Forty Two Investment Company Limited | Construction | 1942 |
| Forum Car Wash Limited | Other services | 2025 |
| Foster House Residents Management Company Ltd | Households | 2008 |
| Four EX (4-X) Casuals Limited | Wholesale & retail | 1987 |
| FOX and Apopei Associates Ltd | Professional & scientific | 2022 |
| Foxleigh Investments Limited | Real estate | 2015 |
| Foxleys Consultancy Limited | Information & communication | 2008 |
| Foxtrot Alpha Sierra Ltd | Information & communication | 2011 |
| FPG (UK) Ltd | Real estate | 2012 |
| FPG Bushbury Ltd | Real estate | 2024 |
| FPG Foods Retail Ltd | Wholesale & retail | 2024 |
| FPG Menai Retail Park Ltd | Real estate | 2024 |
| FPG Polar UK Ltd | Real estate | 2022 |
| FPG Prudhoe Limited | Real estate | 2025 |
| Francis Architects Limited | Professional & scientific | 2009 |
| Francois Gilles Carpets Limited | Other services | 2006 |
| Fransie Ltd | Households | 2018 |
| Franuwell Consulting Limited | Other services | 2022 |
| Fraser Lodge Limited | Construction | 1987 |
| Fratelli Relocations Limited | Administrative & support | 2016 |
| Free Association Books Limited | Administrative & support | 1992 |
| Free Lunch Ltd | Information & communication | 2007 |
| Free Property Agent Limited | Information & communication | 2018 |
| Free Publishing Limited | Information & communication | 2013 |
| Free Records (1993) Limited | Information & communication | 1992 |
| Free Zone Limited | Wholesale & retail | 2021 |
| Freedom Business Solutions Limited | Professional & scientific | 2011 |
| Freespirits Fashion Limited | Wholesale & retail | 2019 |
| Freetrade House Limited | Real estate | 2005 |
| Freewater Plant Hire Limited | Administrative & support | 1999 |
| Freshstar Cleaning & Services Ltd | Administrative & support | 2024 |
| Freshtrax Limited | | 1993 |
| Freya Holdings Limited | Financial services | 2025 |
| Friars Place (North Finchley) Management Co. Limited | Households | 1998 |
| Fringe Furniture Limited | Manufacturing | 1996 |
| Frinton Court ( Frinton on Sea) Limited | Households | 2026 |
| Frith Manor Limited | Arts & recreation | 2023 |
| Frizzell Property Solutions Limited | Real estate | 2022 |
| Frognal Partners LLP | | 2014 |
| Frogs Hollow Limited | Real estate | 2023 |
| Front Foot Solutions Limited | Professional & scientific | 2015 |
| Frontiera Limited | Information & communication | 2015 |
| Frontline Products Ltd | Wholesale & retail | 2020 |
| Fruit Atelier Ltd | Wholesale & retail | 2026 |
| Fruit Bowl Creative Ltd | Information & communication | 2022 |
| FSG (Residential) Ltd | Real estate | 2019 |
| Fshj Capital Ltd | Financial services | 2025 |
| Fshj Ltd | Financial services | 2023 |
| Fshj Property Ltd | Real estate | 2023 |
| Fszk Ltd | Wholesale & retail | 2023 |
| Fuji Properties Ltd | Real estate | 2024 |
| Fulcher-Edwards Limited | Construction | 1997 |
| Fulford Recruitment Solutions Limited | Administrative & support | 2014 |
| Full Entertainment LDN Ltd | Professional & scientific | 2021 |
| Full Service Agency Limited | Professional & scientific | 2006 |
| Fundamental Capital Ltd | Financial services | 2020 |
| Funfaktory Limited | Health & social care | 2025 |
| Furnal Properties Limited | Construction | 1949 |
| Fusion FIX Ltd | Construction | 2025 |
| Future Fortunes Ltd | Wholesale & retail | 2021 |
| Future Goalkeeper Ltd | Arts & recreation | 2022 |
| Future Media London Ltd | Information & communication | 2013 |
| Future Utilities Ltd | Construction | 2017 |
| Futuristic Innovations Limited | Information & communication | 2019 |
| FYA Holdco Limited | Financial services | 2018 |
| G & M Mechanical Services Ltd. | Construction | 2017 |
| G & M Products (Lincoln) Limited | Hospitality | 2018 |
| G & M Products (UK) Limited | Hospitality | 2002 |
| G & M Products Group Limited | Financial services | 2021 |
| G & P Group Enterprise Ltd | Wholesale & retail | 2022 |
| G & P Group Ltd | Real estate | 2021 |
| G Burlica Plastering Ltd | Construction | 2026 |
| G D Financial Limited | Financial services | 2006 |
| G E Design Ltd | Professional & scientific | 2018 |
| G K Web Solutions Limited | Information & communication | 2013 |
| G&A Solutions Ltd | Construction | 2024 |
| G&D Investment Properties Limited | Real estate | 2015 |
| G&G Solutions Ltd | Construction | 2015 |
| G. D Complete Car Sales Ltd | Wholesale & retail | 2012 |
| G.A Fire Ltd | Other services | 2011 |
| G.C. Mechanical Engineering Ltd | Construction | 2016 |
| G.R. Web Services Limited | Information & communication | 2003 |
| G3CORP Ltd | Professional & scientific | 2020 |
| GA Chauffeur Services Ltd | Administrative & support | 2018 |
| GAB Builder Ltd | Construction | 2018 |
| GAB UK Construction Ltd | Construction | 2025 |
| Gables Art Limited | Other services | 2020 |