| Firmrise Limited | Real estate | 1999 |
| First Choice Estates PLC | Real estate | 1987 |
| First Connectivity Limited | Information & communication | 2005 |
| First Egmont Limited | Households | 1997 |
| First Front Limited | Real estate | 1975 |
| Fish Tank Walton Limited | Other services | 2026 |
| FIT4TAP Ltd | Arts & recreation | 2015 |
| Fitzroy Waldron (Holdings) Limited | Financial services | 2024 |
| Five Cotswold Road Management Limited | Real estate | 2000 |
| Five Degrees Ltd | Real estate | 2021 |
| Five Rivers Leatherhead Ltd | Hospitality | 2018 |
| Five Star Cleaning Limited | Households | 2004 |
| Fiya Property Investment Ltd | Real estate | 2020 |
| Flamant Technologies Limited | Professional & scientific | 2007 |
| Flanchford Property Development Limited | Construction | 1997 |
| Flash Revision LAB Ltd | Education | 2024 |
| Flat Records Limited | Arts & recreation | 1990 |
| Flatfocus Management Limited | Households | 2003 |
| Flavell Consultants Limited | Professional & scientific | 2005 |
| FLB Property Ltd | Real estate | 2022 |
| Fleetwell Limited | Professional & scientific | 2000 |
| Fleming Properties Limited | Professional & scientific | 1955 |
| Flemmings Property Services Limited | Real estate | 1996 |
| Fletchers Garage (Englefield Green) Limited | Wholesale & retail | 1964 |
| Flitchtree Limited | | 1981 |
| Flo-Code (UK) Limited | Manufacturing | 2004 |
| Flooring and Cladding Solutions Limited | Other services | 2012 |
| Flooring Trade Supplies | | 2004 |
| Floren Design Limited | Wholesale & retail | 2003 |
| Floren Limited | Professional & scientific | 2005 |
| Flude Mechanical Limited | Construction | 2023 |
| FLY Eagles Travels and Tours Ltd | Administrative & support | 2025 |
| FLY Ride Taxi Services Ltd | Transport & logistics | 2025 |
| Flying Horse Investments Limited | Financial services | 2000 |
| Flying Picture Company Limited | Information & communication | 2004 |
| Flying Start Day Nurseries (Surrey) Limited | Health & social care | 2002 |
| FM Hand Carwash Limited | Professional & scientific | 2003 |
| Fmcg International Ltd | Professional & scientific | 2008 |
| FME Training Ltd | Administrative & support | 2000 |
| FMT Construction Consultants Ltd | Professional & scientific | 2025 |
| Focal Tech Limited | Information & communication | 2001 |
| Focus 1 Limited | Professional & scientific | 2002 |
| Focus Investment Planning Limited | Financial services | 2005 |
| Focus on Finance Limited | Financial services | 1998 |
| Focusneat Limited | Households | 1989 |
| Folder Workshop Ltd | Manufacturing | 2004 |
| FOLIO3 Software UK Limited | Information & communication | 2019 |
| Folk & Fable Ltd | Wholesale & retail | 2020 |
| Food Hygiene Technologies Limited | Professional & scientific | 2008 |
| Food Revolution Limited | Administrative & support | 1999 |
| Food Supplies (Earlswood) Limited | Hospitality | 1967 |
| Football Match Breaks Limited | Administrative & support | 2006 |
| Footprints Montessori Day Nursery Limited | Health & social care | 2004 |
| FOR Balance Limited | Health & social care | 2006 |
| FOR Your Eyes Limited | Professional & scientific | 1998 |
| Forcourt Limited | Real estate | 1997 |
| Ford Insurance Services Limited | | 1982 |
| Fordhams Marquees Ltd | Households | 2022 |
| Forensic Pathology Opinion Limited | Health & social care | 2010 |
| Forest Colard Limited | Wholesale & retail | 2018 |
| Forest Motor and Parts Limited | Wholesale & retail | 2020 |
| Forestwealth Limited | Agriculture & fishing | 2019 |
| Forex Traders Corporation Limited | Education | 2011 |
| Forge Strategy Associates Limited | Professional & scientific | 2016 |
| Formalcourt Site Improvements Limited | Other services | 1983 |
| Fortale Limited | | 1980 |
| Fortek Framing System Ltd | Construction | 2022 |
| Fortune Hives Ltd | Financial services | 2023 |
| Forty Editorial Services Limited | Information & communication | 1999 |
| Forty Four Onslow Road Limited | Professional & scientific | 1999 |
| Foster Business Services Limited | Information & communication | 2007 |
| Fothergill and Company Limited | Professional & scientific | 1979 |
| Fountains Direct Limited | Construction | 1995 |
| Fource Technology Limited | Professional & scientific | 1997 |
| Fourlongs LLP | | 2024 |
| Foxley Clinic Limited(The) | Professional & scientific | 1984 |
| Foxley Investments Properties Limited | Real estate | 2015 |
| Foxleys Limited | Other services | 1997 |
| Framestar Limited | Administrative & support | 1987 |
| Framework Solutions Limited | Information & communication | 1996 |
| Franchesca Limited | Health & social care | 2015 |
| Francis Brickwork Limited | Construction | 2005 |
| Frank Renton Ltd | Administrative & support | 2002 |
| Franklyn Associates | Education | 2019 |
| Frantic FOX Media Limited | Information & communication | 2008 |
| Fraser Trading Company Limited | Wholesale & retail | 1994 |
| Freight Forwarding Solutions Limited | Transport & logistics | 2007 |
| Freightwings Limited | Information & communication | 1984 |
| Freshtwist Limited | Administrative & support | 2003 |
| Freshwater Services Limited | | 1980 |
| Friars Stile Management Limited | Households | 1998 |
| Friday Street Limited | Construction | 1986 |
| Friendly Drinks Limited | Professional & scientific | 1997 |
| Friends Health Care Ltd | Health & social care | 2023 |
| Frisby Wishart Limited | Professional & scientific | 2002 |
| Frontech Limited | Information & communication | 2001 |
| Frontier Software Investments Limited | Extraterritorial | 1965 |
| Frontiers | Other services | 1991 |
| Frontstar Properties Limited | Real estate | 1992 |
| Fryern Stationers Limited | Wholesale & retail | 2003 |