| Five Hillcroome Management Limited | Households | 1991 |
| Five Ifield Road Management Limited | Households | 1980 |
| Five Stars Building Services Limited | Construction | 2020 |
| Fiveway Cottages Limited | Households | 1986 |
| FIX Advice Ltd | Wholesale & retail | 2023 |
| FIX Your Dent and Marine Limited | Wholesale & retail | 2015 |
| FIX4U London Ltd | Wholesale & retail | 2026 |
| Fizeau Group Limited | Information & communication | 2008 |
| FJ Lamin Healthcare Limited | Health & social care | 2023 |
| FJ Resources Limited | Administrative & support | 2022 |
| FJJ Developments Ltd | Construction | 2025 |
| FK Mart Ltd | Wholesale & retail | 2025 |
| Flakeys Ltd | Manufacturing | 2024 |
| Flame Grill Catering Ltd | Hospitality | 2024 |
| Flaming House Services Ltd | Transport & logistics | 2023 |
| FLAT4U Ltd | Hospitality | 2024 |
| FLATS4LONDON Limited | Real estate | 2017 |
| Flavors Junction Limited | Hospitality | 2024 |
| Flaxebay Limited | Real estate | 2020 |
| Fletchers Consultants Ltd | Professional & scientific | 2022 |
| Flex Manor Ltd | Transport & logistics | 2020 |
| Flex-Pro Roofing Ltd | Construction | 2022 |
| Flex-Pro Subs Ltd | Construction | 2025 |
| FLEX365 Ltd | Real estate | 2023 |
| Flexible Dynamics Ltd | Information & communication | 2014 |
| Flexisky Ltd | Other services | 2025 |
| Flier Care Services Limited | Real estate | 1996 |
| Flight Developments Limited | Real estate | 2008 |
| Flightserve Medical Air Charter Ltd | Other services | 2015 |
| Flightserve UK Limited | Administrative & support | 2006 |
| Flizil Ltd | Wholesale & retail | 2021 |
| Flocq Limited | Professional & scientific | 2022 |
| Floka Enterprises Ltd | Hospitality | 2014 |
| Floral Garden Group Ltd. | Wholesale & retail | 2015 |
| Florence Building & Construction Ltd | Construction | 2019 |
| Floristrade London Ltd | Wholesale & retail | 2026 |
| Floward UK Limited | Wholesale & retail | 2020 |
| Floxpat Petroleum & Energy Services Limited | Mining & quarrying | 2011 |
| Fluid Riff Ltd | Hospitality | 2024 |
| Fluxizm Ltd | Wholesale & retail | 2025 |
| Flying Dreamz Limited | Information & communication | 2019 |
| FM Class Brickwork Ltd | Construction | 2018 |
| FM Defence Solutions Ltd | Education | 2016 |
| FMZ Property Group Limited | Real estate | 2023 |
| Focal Technologies Limited | Information & communication | 2021 |
| Focus Images Limited | Professional & scientific | 2008 |
| Focus Video Ltd | Education | 2025 |
| Foil Engineering Limited | Manufacturing | 1967 |
| Fola Consultancy Ltd | Administrative & support | 2019 |
| Folio Services Ltd | Education | 2018 |
| Folkandfork Ltd | Hospitality | 2025 |
| Foltin Consulting Limited | Information & communication | 2011 |
| Fon-A-Car- Ltd | Transport & logistics | 2018 |
| Fone & Vape Ltd | Wholesale & retail | 2020 |
| Fone Town Ltd | Other services | 2019 |
| Fones Fusion Sutton Ltd | Wholesale & retail | 2019 |
| Football Revenue LAB Ltd | Information & communication | 2026 |
| Forest Allan Limited | Information & communication | 2025 |
| Forest Gym Ltd | Arts & recreation | 2026 |
| Forever Services & Co Limited | Households | 2013 |
| Forge Gym Surrey Ltd | Arts & recreation | 2025 |
| Form & Frame Builders Ltd | Construction | 2026 |
| Formika Ltd | Construction | 2011 |
| Formwork Construction Limited | Construction | 2015 |
| Fort Victoria Ltd | Health & social care | 2025 |
| Fortalist Ltd | Extraterritorial | 2024 |
| Fortinus Global Limited | Administrative & support | 2014 |
| Fortress General Management Services Ltd | Professional & scientific | 2021 |
| Fortuna Property Limited | Hospitality | 2005 |
| Fortune 4S Properties Ltd | Real estate | 2025 |
| Fortune 4S Technologies Ltd | Administrative & support | 2016 |
| Fortune Professionals Ltd | Hospitality | 2025 |
| Fortytwo Automotive Ltd | Arts & recreation | 2019 |
| Fortytwo Property Ltd | Real estate | 2019 |
| Foster Mackay Limited | Professional & scientific | 2011 |
| Found Studio London Ltd | Professional & scientific | 2026 |
| Founderfeed Ltd | Information & communication | 2025 |
| Four Founders Ltd | Professional & scientific | 2025 |
| Four Stars Consulting Ltd | Professional & scientific | 2014 |
| Fourways Residents Company Limited | Households | 1962 |
| Fowler Building Services LLP | | 2025 |
| Fowler Care Services Limited | Real estate | 2021 |
| Fowler Project Services Ltd | Professional & scientific | 2026 |
| FOX & Shannon Ltd | Arts & recreation | 2014 |
| FP VP Ltd | Professional & scientific | 2025 |
| FP1988UK Limited | Real estate | 1988 |
| FPH Construction Ltd | Construction | 2025 |
| FPP One Limited | Real estate | 2016 |
| FPP Two Limited | Real estate | 2025 |
| FR Gold Enterprise Ltd | Wholesale & retail | 2020 |
| FR Projects London Ltd | Information & communication | 2019 |
| Frampton Properties Limited | Real estate | 1988 |
| Frampton Securities (2008) Limited | Professional & scientific | 2008 |
| Franchise Lead Consultants Ltd | Professional & scientific | 2025 |
| Francis Property Development Ltd | Real estate | 2022 |
| Frank Digital Limited | Professional & scientific | 2021 |
| Frankie Angel Ltd | Health & social care | 2020 |
| Franklin Sylvestre Ltd | Transport & logistics | 2017 |
| Franzco Refurbishments Ltd | Construction | 2014 |
| Frazer and Haws Limited | Manufacturing | 1996 |