| Football FUN Factory (Community 085) Limited | Arts & recreation | 2023 |
| Forbes Management Company Limited | Households | 1997 |
| Force Development Services Ltd | Professional & scientific | 2009 |
| Force Fitness Ltd | Other services | 2011 |
| Forefront Financial Limited | Financial services | 2021 |
| Forefront Independent Financial Advisory Ltd | Financial services | 2023 |
| Foreign Cosmetic Ltd | Other services | 2022 |
| Foreman Homes East Ltd | Construction | 2002 |
| Foreman Homes Group Limited | Professional & scientific | 2002 |
| Foreman Homes Limited | Construction | 1997 |
| Foreman Homes South Ltd | Construction | 2002 |
| Foresitemanagement Limited | Construction | 2025 |
| Forest Edge Residents Company Limited | Households | 2025 |
| Forest Transport Ltd | Transport & logistics | 2023 |
| Foretrue Consultancy Service Ltd | Professional & scientific | 2021 |
| Forever Projects Limited | Wholesale & retail | 2008 |
| Forever Technology Ltd | Information & communication | 2020 |
| Forfar Specsavers Limited | Wholesale & retail | 2009 |
| Forfar Visionplus Limited | Wholesale & retail | 2009 |
| Forge Group Holdings Limited | Financial services | 2024 |
| Forge Quanta Limited | Financial services | 2026 |
| Forget ME NOT (Stubbington) Ltd | Wholesale & retail | 2012 |
| Fork N Pint Limited | Hospitality | 2025 |
| Formaclad Ltd | Wholesale & retail | 2024 |
| Formby Specsavers Hearcare Limited | Wholesale & retail | 2026 |
| Formby Specsavers Limited | Wholesale & retail | 2005 |
| Formby Visionplus Limited | Wholesale & retail | 2005 |
| Formunauts One Ltd | Other services | 2020 |
| Forseti Training Ltd | Education | 2022 |
| Fort Fareham Garage Ltd. | Wholesale & retail | 2020 |
| Fort Fareham Industrial Estate Management Company Limited | Real estate | 2004 |
| Fort Shield Limited | Construction | 2004 |
| Fort William Specsavers Limited | Wholesale & retail | 2025 |
| Fortis Steel Ltd | Manufacturing | 2018 |
| Forton Limited | Real estate | 2000 |
| Fortview Limited | Professional & scientific | 1999 |
| Forum Heating & Plumbing Service Limited | Construction | 2026 |
| Fosse Park Specsavers Limited | Wholesale & retail | 2018 |
| Fotoplex Grigio Limited | Manufacturing | 1998 |
| Fotoplex Properties Ltd | Real estate | 2024 |
| Foundations Forward Ltd | Professional & scientific | 2024 |
| Fountain Professional Services Ltd | Administrative & support | 2025 |
| Four Corners 4C Ltd | Health & social care | 2024 |
| Four-Tees Engineers Limited | Manufacturing | 1986 |
| Fourmation Developments Ltd | Construction | 2014 |
| Fourth Plinth Acupuncture Limited | Information & communication | 2013 |
| Fourth Woodlea Place Management Company (Whiteley) Limited | Households | 1997 |
| Fourways Residential Home Ltd | Health & social care | 2006 |
| FOX IT Ltd | Information & communication | 2026 |
| FOX Valley Specsavers Limited | Wholesale & retail | 2018 |
| Foxearth Equestrian Services Ltd | Agriculture & fishing | 2024 |
| FPA Ltd | Professional & scientific | 2025 |
| FPH Capital Ltd | Real estate | 2010 |
| FPO Estates Ltd | Real estate | 2020 |
| FQT Ltd | Professional & scientific | 2020 |
| Frame Your Day Ltd | Information & communication | 2024 |
| Frames Solutions Limited | Wholesale & retail | 2021 |
| Francesca Grange Freehold Company Limited | Households | 2021 |
| Francis & SON Construction Limited | Public administration | 2007 |
| Francis Ogden Limited | Wholesale & retail | 2020 |
| Franjoy Limited | Transport & logistics | 2019 |
| Franks & Sons Plastering Limited | Construction | 2025 |
| Frasan Limited | Health & social care | 2023 |
| Fraserburgh Specsavers Limited | Wholesale & retail | 2022 |
| Fratton Road Freehold Ltd | Professional & scientific | 2024 |
| FRB Building Solutions Ltd | Construction | 2025 |
| Frebs Marine International Ltd | Professional & scientific | 2013 |
| Freedom of Europe Holidays Limited | Administrative & support | 1987 |
| Freeston Limited | Manufacturing | 2012 |
| Freestone Jacobs Holdings Limited | Professional & scientific | 2018 |
| Freeway Contract Flooring Limited | Construction | 2000 |
| Fresh PIN Creative Ltd | Professional & scientific | 2024 |
| Fresh Service Telecoms Ltd | Information & communication | 2023 |
| Freshly Squeezed Consulting Limited | Professional & scientific | 2014 |
| Freshome Cleaning Company Ltd | Administrative & support | 2024 |
| Freston Shipping Limited | Transport & logistics | 2015 |
| Freya Natural Therapy Limited | Other services | 2008 |
| Friend of a Friend Limited | Professional & scientific | 2022 |
| Friendly Building Company Ltd | Construction | 2021 |
| Frimley Computing Limited | Information & communication | 2021 |
| FRL Limited | Information & communication | 2016 |
| Frogson Waste Management Limited | Water & waste | 1983 |
| Frogson Waste Oils Limited | Extraterritorial | 2006 |
| Frome Specsavers Limited | Wholesale & retail | 1986 |
| Frome Visionplus Limited | Wholesale & retail | 1995 |
| Front Page News Ltd | Administrative & support | 2012 |
| Frontline Clinical Education Ltd | Education | 2019 |
| Frontwave Ltd | Information & communication | 2013 |
| Fryer Court Limited | Real estate | 2024 |
| Fryer Court Management Limited | Real estate | 2024 |
| Fsdt UK Ltd | Other services | 2021 |
| Fstd Consultants Limited | Professional & scientific | 2023 |
| Fulham Specsavers Hearcare Limited | Wholesale & retail | 2019 |
| Fulham Specsavers Limited | Wholesale & retail | 2003 |
| Fulham Visionplus Limited | Wholesale & retail | 2003 |
| Fulham Wharf Specsavers Limited | Wholesale & retail | 2018 |
| Full Aspects Limited | Construction | 2022 |
| Full House (Solent) Ltd | Real estate | 2018 |
| Full Send Motorsport Limited | Arts & recreation | 2025 |
| Fullstream Consulting Ltd | Administrative & support | 2015 |