| Fartushynskyi Limited | Real estate | 2026 |
| Fast Food Management Limited | Hospitality | 2024 |
| Fast Lane Success Ltd | Administrative & support | 2015 |
| Fast Lanez Driving School Limited | Education | 2021 |
| Fasttrack Recruitment Group Limited | Professional & scientific | 2006 |
| FAT Girl Makes Limited | Wholesale & retail | 2026 |
| Fati Mitro Ltd | Transport & logistics | 2021 |
| Favcrs Ltd | Hospitality | 2025 |
| Favour Kelvin Ltd | Information & communication | 2026 |
| Favoured Cakes Ltd. | Hospitality | 2012 |
| Fawkham Valley Hiab & Haulage Ltd | Construction | 2026 |
| Fawkham Valley Scaffolding (Northern) Ltd | Construction | 2016 |
| Fawkham Valley Scaffolding Limited | Construction | 2011 |
| Faxlink Communications Ltd | Extraterritorial | 1991 |
| FD Building Services Ltd | Construction | 2019 |
| Fearo Ltd | Professional & scientific | 2019 |
| Feasibility East Limited | Professional & scientific | 1992 |
| Feat Business Services Limited | Administrative & support | 2022 |
| FED UP Food Limited | Information & communication | 2025 |
| Feelgood Associates Ltd | Professional & scientific | 2013 |
| Felden Commissioning Limited | Construction | 2021 |
| Felix 298 Holdings Limited | Real estate | 2024 |
| FEN Twenty One Limited | Administrative & support | 2010 |
| Fenner Nash Electrical Limited | Construction | 1994 |
| Fentrin Limited | Professional & scientific | 2012 |
| Fercell Engineering Limited | Professional & scientific | 1977 |
| Fercell Holdings Limited | Financial services | 2010 |
| Ferdinand Decorating Services Limited | Construction | 2020 |
| Fero Plastering Ltd. | Construction | 2017 |
| Ferrari's Hair Studio Limited | Other services | 2024 |
| FGB Coaching & Consulting Ltd | Administrative & support | 2025 |
| FGF Construction Services Limited | Professional & scientific | 2023 |
| Fhkh Developments Limited | Real estate | 2025 |
| Fieldrail Limited | Construction | 2018 |
| Fifteen Network Ltd | Administrative & support | 2024 |
| Figma Construction Limited | Construction | 2026 |
| FIN Marketing & Communications Limited | Arts & recreation | 1983 |
| Finalframefilms Ltd | Arts & recreation | 2021 |
| Fine Carpenters Ltd | Construction | 2024 |
| Finefinish Contractors Ltd | Construction | 2018 |
| Finesse Scaffolding Ltd | Construction | 2020 |
| Finurture Ltd | Professional & scientific | 2022 |
| Fire Pizza Sidcup Ltd | Hospitality | 2022 |
| Fire Star Interiors Ltd | Construction | 2025 |
| Firetec Services Limited | Public administration | 2017 |
| Firhill 1 Limited | Real estate | 2025 |
| Firmay Limited | Construction | 2020 |
| First Alert Alarm Services Limited | Administrative & support | 2013 |
| First Company Consulting Limited | Professional & scientific | 2007 |
| First Environmental Ltd | Construction | 2024 |
| First in Last OUT Limited | Administrative & support | 2023 |
| First Option Support Ltd | Administrative & support | 2022 |
| First Step Services Limited | Construction | 2020 |
| First Time Rail Limited | Construction | 2019 |
| Firsthaven Developments Limited | Real estate | 2005 |
| Fisical Solutions Limited | Administrative & support | 2019 |
| Fit and Healthy Ltd | Arts & recreation | 2019 |
| Fit Female Project Limited | Other services | 2024 |
| Fitness Performance Limited | Arts & recreation | 2024 |
| Five Star Marquee Hire Limited | Administrative & support | 2023 |
| Five Star Motor & Valeting Ltd | Wholesale & retail | 2023 |
| Five Star Service UK Limited | Arts & recreation | 1996 |
| Five Tees Limited | Construction | 2018 |
| FJ & a Limited | Construction | 2015 |
| FKJ Buildings Limited | Construction | 2024 |
| Flaim Ltd | Wholesale & retail | 2026 |
| Flairhurst Investments Limited | Real estate | 1964 |
| Flame Refractory Limited | Other services | 2023 |
| Flaming Art Tattoo Limited | Other services | 2011 |
| Flamingo Catering Ltd | Hospitality | 2024 |
| Flat OUT Roofing Solutions Ltd | Construction | 2025 |
| Flex Lift Services Limited | Manufacturing | 2013 |
| Flex Training and Nutrition Limited | Arts & recreation | 2022 |
| FLM Independent Ltd | Professional & scientific | 2023 |
| FLM Limited | Extraterritorial | 2019 |
| Floor Gallery Limited | Construction | 2018 |
| Flooring by Kimpton Limited | Construction | 2013 |
| Floral Frog Limited | Information & communication | 2016 |
| Florencio Ltd | Administrative & support | 2023 |
| Flossy Sunday Bakery Limited | Administrative & support | 2017 |
| Flow and Grow Limited | Extraterritorial | 2021 |
| Flow Tech UK Solutions Ltd | Professional & scientific | 2018 |
| FLOW3DRONES Limited | Administrative & support | 2021 |
| Flo’S Baby & Childrenswear Boutique Limited | Wholesale & retail | 2020 |
| FLS Consultancy Ltd | Administrative & support | 2010 |
| Fluid Solutions Plumbing and Heating Ltd | Construction | 2013 |
| Flush & Flow Plumbing & Heating Ltd | Construction | 2020 |
| Flynn Portfolio Limited | Real estate | 2015 |
| Flynn Project Management Limited | Construction | 2024 |
| FM Carpentry Ltd | Construction | 2019 |
| FM1 Security Limited | Administrative & support | 2024 |
| Fnpa Ltd | Construction | 2025 |
| FOA Register Limited | Other services | 2025 |
| Focus Edit Limited | Professional & scientific | 2024 |
| Fontaine Electrical Security Limited | Administrative & support | 2021 |
| Food Tastic Brands Limited | Wholesale & retail | 2023 |
| Football FUN Factory (Community 088) Limited | Arts & recreation | 2023 |
| Footprint Litho Limited | Administrative & support | 2007 |
| Footprint Renovation Ltd | Construction | 2022 |
| Foots Cray Lions JFC (Youth) CIC | Arts & recreation | 2026 |